| Message ID | 20220705060014.10050-1-vidyas@nvidia.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
| Series | [V2] PCI/ASPM: Save/restore L1SS Capability for suspend/resume | expand |
Hi, @Kenneth, Could you please verify it on your laptop one last time? @Bjorn, Could you please review this change in the meanwhile? Thanks, Vidya Sagar On 7/5/2022 11:30 AM, Vidya Sagar wrote: > External email: Use caution opening links or attachments > > > Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > saved and restored during suspend/resume leading to L1 Substates > configuration being lost post-resume. > > Save the L1 Substates control registers so that the configuration is > retained post-resume. > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > --- > Hi, > Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > on your laptop (Dell XPS 13) one last time? > IMHO, the regression observed on your laptop with an old version of the patch > could be due to a buggy old version BIOS in the laptop. > > Thanks, > Vidya Sagar > > drivers/pci/pci.c | 7 +++++++ > drivers/pci/pci.h | 4 ++++ > drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 55 insertions(+) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index cfaf40a540a8..aca05880aaa3 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > return i; > > pci_save_ltr_state(dev); > + pci_save_aspm_l1ss_state(dev); > pci_save_dpc_state(dev); > pci_save_aer_state(dev); > pci_save_ptm_state(dev); > @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > * LTR itself (in the PCIe capability). > */ > pci_restore_ltr_state(dev); > + pci_restore_aspm_l1ss_state(dev); > > pci_restore_pcie_state(dev); > pci_restore_pasid_state(dev); > @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > if (error) > pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > + 2 * sizeof(u32)); > + if (error) > + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > + > pci_allocate_vc_save_buffers(dev); > } > > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > index e10cdec6c56e..92d8c92662a4 100644 > --- a/drivers/pci/pci.h > +++ b/drivers/pci/pci.h > @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > void pcie_aspm_exit_link_state(struct pci_dev *pdev); > void pcie_aspm_pm_state_change(struct pci_dev *pdev); > void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > #else > static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > #endif > > #ifdef CONFIG_PCIE_ECRC > diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > index a96b7424c9bc..2c29fdd20059 100644 > --- a/drivers/pci/pcie/aspm.c > +++ b/drivers/pci/pcie/aspm.c > @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > PCI_L1SS_CTL1_L1SS_MASK, val); > } > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > +{ > + int aspm_l1ss; > + struct pci_cap_saved_state *save_state; > + u32 *cap; > + > + if (!pci_is_pcie(dev)) > + return; > + > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > + if (!aspm_l1ss) > + return; > + > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > + if (!save_state) > + return; > + > + cap = (u32 *)&save_state->cap.data[0]; > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > +} > + > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > +{ > + int aspm_l1ss; > + struct pci_cap_saved_state *save_state; > + u32 *cap; > + > + if (!pci_is_pcie(dev)) > + return; > + > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > + if (!aspm_l1ss) > + return; > + > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > + if (!save_state) > + return; > + > + cap = (u32 *)&save_state->cap.data[0]; > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > +} > + > static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > { > pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > -- > 2.17.1 >
[+cc Kai-Heng] On Wed, Jul 13, 2022 at 11:29:42PM +0530, Vidya Sagar wrote: > Hi, > @Kenneth, Could you please verify it on your laptop one last time? > > @Bjorn, Could you please review this change in the meanwhile? Seems like this may be related to Kai-Heng's patch: https://lore.kernel.org/r/20220509073639.2048236-1-kai.heng.feng@canonical.com since he specifically mentioned L1SS. I applied Kai-Heng's patch for v5.20 yesterday, but I haven't worked out the connection to this patch. But if you want Kenneth to test this, it should probably be on top of Kai-Heng's patch so we're testing something close to the eventual result. > On 7/5/2022 11:30 AM, Vidya Sagar wrote: > > External email: Use caution opening links or attachments > > > > > > Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > > saved and restored during suspend/resume leading to L1 Substates > > configuration being lost post-resume. > > > > Save the L1 Substates control registers so that the configuration is > > retained post-resume. > > > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > > Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > > --- > > Hi, > > Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > > on your laptop (Dell XPS 13) one last time? > > IMHO, the regression observed on your laptop with an old version of the patch > > could be due to a buggy old version BIOS in the laptop. > > > > Thanks, > > Vidya Sagar > > > > drivers/pci/pci.c | 7 +++++++ > > drivers/pci/pci.h | 4 ++++ > > drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 55 insertions(+) > > > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > index cfaf40a540a8..aca05880aaa3 100644 > > --- a/drivers/pci/pci.c > > +++ b/drivers/pci/pci.c > > @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > > return i; > > > > pci_save_ltr_state(dev); > > + pci_save_aspm_l1ss_state(dev); > > pci_save_dpc_state(dev); > > pci_save_aer_state(dev); > > pci_save_ptm_state(dev); > > @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > > * LTR itself (in the PCIe capability). > > */ > > pci_restore_ltr_state(dev); > > + pci_restore_aspm_l1ss_state(dev); > > > > pci_restore_pcie_state(dev); > > pci_restore_pasid_state(dev); > > @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > > if (error) > > pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > > > + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > > + 2 * sizeof(u32)); > > + if (error) > > + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > > + > > pci_allocate_vc_save_buffers(dev); > > } > > > > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > > index e10cdec6c56e..92d8c92662a4 100644 > > --- a/drivers/pci/pci.h > > +++ b/drivers/pci/pci.h > > @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > > void pcie_aspm_exit_link_state(struct pci_dev *pdev); > > void pcie_aspm_pm_state_change(struct pci_dev *pdev); > > void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > > #else > > static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > > static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > > static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > > static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > > +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > > +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > > #endif > > > > #ifdef CONFIG_PCIE_ECRC > > diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > > index a96b7424c9bc..2c29fdd20059 100644 > > --- a/drivers/pci/pcie/aspm.c > > +++ b/drivers/pci/pcie/aspm.c > > @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > > PCI_L1SS_CTL1_L1SS_MASK, val); > > } > > > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > > +{ > > + int aspm_l1ss; > > + struct pci_cap_saved_state *save_state; > > + u32 *cap; > > + > > + if (!pci_is_pcie(dev)) > > + return; > > + > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!aspm_l1ss) > > + return; > > + > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!save_state) > > + return; > > + > > + cap = (u32 *)&save_state->cap.data[0]; > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > > +} > > + > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > > +{ > > + int aspm_l1ss; > > + struct pci_cap_saved_state *save_state; > > + u32 *cap; > > + > > + if (!pci_is_pcie(dev)) > > + return; > > + > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!aspm_l1ss) > > + return; > > + > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!save_state) > > + return; > > + > > + cap = (u32 *)&save_state->cap.data[0]; > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > +} > > + > > static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > > { > > pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > > -- > > 2.17.1 > >
On Thu, Jul 14, 2022 at 2:16 AM Bjorn Helgaas <helgaas@kernel.org> wrote: > > [+cc Kai-Heng] > > On Wed, Jul 13, 2022 at 11:29:42PM +0530, Vidya Sagar wrote: > > Hi, > > @Kenneth, Could you please verify it on your laptop one last time? > > > > @Bjorn, Could you please review this change in the meanwhile? > > Seems like this may be related to Kai-Heng's patch: > https://lore.kernel.org/r/20220509073639.2048236-1-kai.heng.feng@canonical.com > since he specifically mentioned L1SS. Yes, to make L1ss restore successful on system resume this patch is also needed. Kai-Heng > > I applied Kai-Heng's patch for v5.20 yesterday, but I haven't worked > out the connection to this patch. But if you want Kenneth to test > this, it should probably be on top of Kai-Heng's patch so we're > testing something close to the eventual result. > > > On 7/5/2022 11:30 AM, Vidya Sagar wrote: > > > External email: Use caution opening links or attachments > > > > > > > > > Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > > > saved and restored during suspend/resume leading to L1 Substates > > > configuration being lost post-resume. > > > > > > Save the L1 Substates control registers so that the configuration is > > > retained post-resume. > > > > > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > > > Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > > > --- > > > Hi, > > > Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > > > on your laptop (Dell XPS 13) one last time? > > > IMHO, the regression observed on your laptop with an old version of the patch > > > could be due to a buggy old version BIOS in the laptop. > > > > > > Thanks, > > > Vidya Sagar > > > > > > drivers/pci/pci.c | 7 +++++++ > > > drivers/pci/pci.h | 4 ++++ > > > drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > > > 3 files changed, 55 insertions(+) > > > > > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > > index cfaf40a540a8..aca05880aaa3 100644 > > > --- a/drivers/pci/pci.c > > > +++ b/drivers/pci/pci.c > > > @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > > > return i; > > > > > > pci_save_ltr_state(dev); > > > + pci_save_aspm_l1ss_state(dev); > > > pci_save_dpc_state(dev); > > > pci_save_aer_state(dev); > > > pci_save_ptm_state(dev); > > > @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > > > * LTR itself (in the PCIe capability). > > > */ > > > pci_restore_ltr_state(dev); > > > + pci_restore_aspm_l1ss_state(dev); > > > > > > pci_restore_pcie_state(dev); > > > pci_restore_pasid_state(dev); > > > @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > > > if (error) > > > pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > > > > > + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > > > + 2 * sizeof(u32)); > > > + if (error) > > > + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > > > + > > > pci_allocate_vc_save_buffers(dev); > > > } > > > > > > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > > > index e10cdec6c56e..92d8c92662a4 100644 > > > --- a/drivers/pci/pci.h > > > +++ b/drivers/pci/pci.h > > > @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > > > void pcie_aspm_exit_link_state(struct pci_dev *pdev); > > > void pcie_aspm_pm_state_change(struct pci_dev *pdev); > > > void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > > > #else > > > static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > > > static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > > > static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > > > static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > > > +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > > > +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > > > #endif > > > > > > #ifdef CONFIG_PCIE_ECRC > > > diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > > > index a96b7424c9bc..2c29fdd20059 100644 > > > --- a/drivers/pci/pcie/aspm.c > > > +++ b/drivers/pci/pcie/aspm.c > > > @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > > > PCI_L1SS_CTL1_L1SS_MASK, val); > > > } > > > > > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > > > +{ > > > + int aspm_l1ss; > > > + struct pci_cap_saved_state *save_state; > > > + u32 *cap; > > > + > > > + if (!pci_is_pcie(dev)) > > > + return; > > > + > > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > > + if (!aspm_l1ss) > > > + return; > > > + > > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > > + if (!save_state) > > > + return; > > > + > > > + cap = (u32 *)&save_state->cap.data[0]; > > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > > > +} > > > + > > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > > > +{ > > > + int aspm_l1ss; > > > + struct pci_cap_saved_state *save_state; > > > + u32 *cap; > > > + > > > + if (!pci_is_pcie(dev)) > > > + return; > > > + > > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > > + if (!aspm_l1ss) > > > + return; > > > + > > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > > + if (!save_state) > > > + return; > > > + > > > + cap = (u32 *)&save_state->cap.data[0]; > > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > > +} > > > + > > > static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > > > { > > > pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > > > -- > > > 2.17.1 > > >
On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > > Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > saved and restored during suspend/resume leading to L1 Substates > configuration being lost post-resume. > > Save the L1 Substates control registers so that the configuration is > retained post-resume. > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > Tested-by: Abhishek Sahu <abhsahu@nvidia.com> Hi Vidya, I tested this patch on kernel v5.19-rc6. The test device is GL9755 card reader controller on Intel i5-10210U RVP. This patch can restore L1SS after suspend/resume. The test results are as follows: After Boot: #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" Capabilities: [110 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ PortCommonModeRestoreTime=255us PortTPowerOnTime=3100us L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ T_CommonMode=0us LTR1.2_Threshold=3145728ns L1SubCtl2: T_PwrOn=3100us After suspend/resume without this patch. #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" Capabilities: [110 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ PortCommonModeRestoreTime=255us PortTPowerOnTime=3100us L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- T_CommonMode=0us LTR1.2_Threshold=0ns L1SubCtl2: T_PwrOn=10us After suspend/resume with this patch. #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" Capabilities: [110 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ PortCommonModeRestoreTime=255us PortTPowerOnTime=3100us L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ T_CommonMode=0us LTR1.2_Threshold=3145728ns L1SubCtl2: T_PwrOn=3100us Tested-by: Ben Chuang <benchuanggli@gmail.com> Best regards, Ben Chuang > --- > Hi, > Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > on your laptop (Dell XPS 13) one last time? > IMHO, the regression observed on your laptop with an old version of the patch > could be due to a buggy old version BIOS in the laptop. > > Thanks, > Vidya Sagar > > drivers/pci/pci.c | 7 +++++++ > drivers/pci/pci.h | 4 ++++ > drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 55 insertions(+) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index cfaf40a540a8..aca05880aaa3 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > return i; > > pci_save_ltr_state(dev); > + pci_save_aspm_l1ss_state(dev); > pci_save_dpc_state(dev); > pci_save_aer_state(dev); > pci_save_ptm_state(dev); > @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > * LTR itself (in the PCIe capability). > */ > pci_restore_ltr_state(dev); > + pci_restore_aspm_l1ss_state(dev); > > pci_restore_pcie_state(dev); > pci_restore_pasid_state(dev); > @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > if (error) > pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > + 2 * sizeof(u32)); > + if (error) > + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > + > pci_allocate_vc_save_buffers(dev); > } > > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > index e10cdec6c56e..92d8c92662a4 100644 > --- a/drivers/pci/pci.h > +++ b/drivers/pci/pci.h > @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > void pcie_aspm_exit_link_state(struct pci_dev *pdev); > void pcie_aspm_pm_state_change(struct pci_dev *pdev); > void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > #else > static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > #endif > > #ifdef CONFIG_PCIE_ECRC > diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > index a96b7424c9bc..2c29fdd20059 100644 > --- a/drivers/pci/pcie/aspm.c > +++ b/drivers/pci/pcie/aspm.c > @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > PCI_L1SS_CTL1_L1SS_MASK, val); > } > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > +{ > + int aspm_l1ss; > + struct pci_cap_saved_state *save_state; > + u32 *cap; > + > + if (!pci_is_pcie(dev)) > + return; > + > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > + if (!aspm_l1ss) > + return; > + > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > + if (!save_state) > + return; > + > + cap = (u32 *)&save_state->cap.data[0]; > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > +} > + > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > +{ > + int aspm_l1ss; > + struct pci_cap_saved_state *save_state; > + u32 *cap; > + > + if (!pci_is_pcie(dev)) > + return; > + > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > + if (!aspm_l1ss) > + return; > + > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > + if (!save_state) > + return; > + > + cap = (u32 *)&save_state->cap.data[0]; > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > +} > + > static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > { > pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > -- > 2.17.1 >
On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > > On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > > > > Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > > saved and restored during suspend/resume leading to L1 Substates > > configuration being lost post-resume. > > > > Save the L1 Substates control registers so that the configuration is > > retained post-resume. > > > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > > Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > > Hi Vidya, > > I tested this patch on kernel v5.19-rc6. > The test device is GL9755 card reader controller on Intel i5-10210U RVP. > This patch can restore L1SS after suspend/resume. > > The test results are as follows: > > After Boot: > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > Capabilities: [110 v1] L1 PM Substates > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > ASPM_L1.1+ L1_PM_Substates+ > PortCommonModeRestoreTime=255us > PortTPowerOnTime=3100us > L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > T_CommonMode=0us LTR1.2_Threshold=3145728ns > L1SubCtl2: T_PwrOn=3100us > > > After suspend/resume without this patch. > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > Capabilities: [110 v1] L1 PM Substates > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > ASPM_L1.1+ L1_PM_Substates+ > PortCommonModeRestoreTime=255us > PortTPowerOnTime=3100us > L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > T_CommonMode=0us LTR1.2_Threshold=0ns > L1SubCtl2: T_PwrOn=10us > > > After suspend/resume with this patch. > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > Capabilities: [110 v1] L1 PM Substates > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > ASPM_L1.1+ L1_PM_Substates+ > PortCommonModeRestoreTime=255us > PortTPowerOnTime=3100us > L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > T_CommonMode=0us LTR1.2_Threshold=3145728ns > L1SubCtl2: T_PwrOn=3100us > > > Tested-by: Ben Chuang <benchuanggli@gmail.com> Forgot to add mine: Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > > Best regards, > Ben Chuang > > > > --- > > Hi, > > Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > > on your laptop (Dell XPS 13) one last time? > > IMHO, the regression observed on your laptop with an old version of the patch > > could be due to a buggy old version BIOS in the laptop. > > > > Thanks, > > Vidya Sagar > > > > drivers/pci/pci.c | 7 +++++++ > > drivers/pci/pci.h | 4 ++++ > > drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > > 3 files changed, 55 insertions(+) > > > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > index cfaf40a540a8..aca05880aaa3 100644 > > --- a/drivers/pci/pci.c > > +++ b/drivers/pci/pci.c > > @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > > return i; > > > > pci_save_ltr_state(dev); > > + pci_save_aspm_l1ss_state(dev); > > pci_save_dpc_state(dev); > > pci_save_aer_state(dev); > > pci_save_ptm_state(dev); > > @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > > * LTR itself (in the PCIe capability). > > */ > > pci_restore_ltr_state(dev); > > + pci_restore_aspm_l1ss_state(dev); > > > > pci_restore_pcie_state(dev); > > pci_restore_pasid_state(dev); > > @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > > if (error) > > pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > > > + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > > + 2 * sizeof(u32)); > > + if (error) > > + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > > + > > pci_allocate_vc_save_buffers(dev); > > } > > > > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > > index e10cdec6c56e..92d8c92662a4 100644 > > --- a/drivers/pci/pci.h > > +++ b/drivers/pci/pci.h > > @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > > void pcie_aspm_exit_link_state(struct pci_dev *pdev); > > void pcie_aspm_pm_state_change(struct pci_dev *pdev); > > void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > > #else > > static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > > static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > > static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > > static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > > +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > > +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > > #endif > > > > #ifdef CONFIG_PCIE_ECRC > > diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > > index a96b7424c9bc..2c29fdd20059 100644 > > --- a/drivers/pci/pcie/aspm.c > > +++ b/drivers/pci/pcie/aspm.c > > @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > > PCI_L1SS_CTL1_L1SS_MASK, val); > > } > > > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > > +{ > > + int aspm_l1ss; > > + struct pci_cap_saved_state *save_state; > > + u32 *cap; > > + > > + if (!pci_is_pcie(dev)) > > + return; > > + > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!aspm_l1ss) > > + return; > > + > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!save_state) > > + return; > > + > > + cap = (u32 *)&save_state->cap.data[0]; > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > > +} > > + > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > > +{ > > + int aspm_l1ss; > > + struct pci_cap_saved_state *save_state; > > + u32 *cap; > > + > > + if (!pci_is_pcie(dev)) > > + return; > > + > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!aspm_l1ss) > > + return; > > + > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!save_state) > > + return; > > + > > + cap = (u32 *)&save_state->cap.data[0]; > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > +} > > + > > static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > > { > > pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > > -- > > 2.17.1 > >
pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > > On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > > > > On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > > > > > > Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > > > saved and restored during suspend/resume leading to L1 Substates > > > configuration being lost post-resume. > > > > > > Save the L1 Substates control registers so that the configuration is > > > retained post-resume. > > > > > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > > > Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > > > > Hi Vidya, > > > > I tested this patch on kernel v5.19-rc6. > > The test device is GL9755 card reader controller on Intel i5-10210U RVP. > > This patch can restore L1SS after suspend/resume. > > > > The test results are as follows: > > > > After Boot: > > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > Capabilities: [110 v1] L1 PM Substates > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > ASPM_L1.1+ L1_PM_Substates+ > > PortCommonModeRestoreTime=255us > > PortTPowerOnTime=3100us > > L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > T_CommonMode=0us LTR1.2_Threshold=3145728ns > > L1SubCtl2: T_PwrOn=3100us > > > > > > After suspend/resume without this patch. > > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > Capabilities: [110 v1] L1 PM Substates > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > ASPM_L1.1+ L1_PM_Substates+ > > PortCommonModeRestoreTime=255us > > PortTPowerOnTime=3100us > > L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > > T_CommonMode=0us LTR1.2_Threshold=0ns > > L1SubCtl2: T_PwrOn=10us > > > > > > After suspend/resume with this patch. > > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > Capabilities: [110 v1] L1 PM Substates > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > ASPM_L1.1+ L1_PM_Substates+ > > PortCommonModeRestoreTime=255us > > PortTPowerOnTime=3100us > > L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > T_CommonMode=0us LTR1.2_Threshold=3145728ns > > L1SubCtl2: T_PwrOn=3100us > > > > > > Tested-by: Ben Chuang <benchuanggli@gmail.com> > > Forgot to add mine: > Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > > > > > Best regards, > > Ben Chuang > > > > > > > --- > > > Hi, > > > Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > > > on your laptop (Dell XPS 13) one last time? > > > IMHO, the regression observed on your laptop with an old version of the patch > > > could be due to a buggy old version BIOS in the laptop. > > > > > > Thanks, > > > Vidya Sagar > > > > > > drivers/pci/pci.c | 7 +++++++ > > > drivers/pci/pci.h | 4 ++++ > > > drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > > > 3 files changed, 55 insertions(+) > > > > > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > > index cfaf40a540a8..aca05880aaa3 100644 > > > --- a/drivers/pci/pci.c > > > +++ b/drivers/pci/pci.c > > > @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > > > return i; > > > > > > pci_save_ltr_state(dev); > > > + pci_save_aspm_l1ss_state(dev); > > > pci_save_dpc_state(dev); > > > pci_save_aer_state(dev); > > > pci_save_ptm_state(dev); > > > @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > > > * LTR itself (in the PCIe capability). > > > */ > > > pci_restore_ltr_state(dev); > > > + pci_restore_aspm_l1ss_state(dev); > > > > > > pci_restore_pcie_state(dev); > > > pci_restore_pasid_state(dev); > > > @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > > > if (error) > > > pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > > > > > + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > > > + 2 * sizeof(u32)); > > > + if (error) > > > + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > > > + > > > pci_allocate_vc_save_buffers(dev); > > > } > > > > > > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > > > index e10cdec6c56e..92d8c92662a4 100644 > > > --- a/drivers/pci/pci.h > > > +++ b/drivers/pci/pci.h > > > @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > > > void pcie_aspm_exit_link_state(struct pci_dev *pdev); > > > void pcie_aspm_pm_state_change(struct pci_dev *pdev); > > > void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > > > #else > > > static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > > > static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > > > static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > > > static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > > > +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > > > +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > > > #endif > > > > > > #ifdef CONFIG_PCIE_ECRC > > > diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > > > index a96b7424c9bc..2c29fdd20059 100644 > > > --- a/drivers/pci/pcie/aspm.c > > > +++ b/drivers/pci/pcie/aspm.c > > > @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > > > PCI_L1SS_CTL1_L1SS_MASK, val); > > > } > > > > > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > > > +{ > > > + int aspm_l1ss; > > > + struct pci_cap_saved_state *save_state; > > > + u32 *cap; > > > + > > > + if (!pci_is_pcie(dev)) > > > + return; > > > + > > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > > + if (!aspm_l1ss) > > > + return; > > > + > > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > > + if (!save_state) > > > + return; > > > + > > > + cap = (u32 *)&save_state->cap.data[0]; > > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > > > +} > > > + > > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > > > +{ > > > + int aspm_l1ss; > > > + struct pci_cap_saved_state *save_state; > > > + u32 *cap; > > > + > > > + if (!pci_is_pcie(dev)) > > > + return; > > > + > > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > > + if (!aspm_l1ss) > > > + return; > > > + > > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > > + if (!save_state) > > > + return; > > > + > > > + cap = (u32 *)&save_state->cap.data[0]; > > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > > +} > > > + > > > static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > > > { > > > pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > > > -- > > > 2.17.1 > > > Hi, With this patch (and also mentioned https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) applied on 5.10 (chromeos-5.10) I am observing problems after suspend/resume with my WiFi card - it looks like whole communication via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 I played a little bit with this code and it looks like the pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know why, not a PCI expert). Best regards, Lukasz
On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > > On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > > > On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > > > > > > > > Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > > > > saved and restored during suspend/resume leading to L1 Substates > > > > configuration being lost post-resume. > > > > > > > > Save the L1 Substates control registers so that the configuration is > > > > retained post-resume. > > > > > > > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > > > > Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > > > > > > Hi Vidya, > > > > > > I tested this patch on kernel v5.19-rc6. > > > The test device is GL9755 card reader controller on Intel i5-10210U RVP. > > > This patch can restore L1SS after suspend/resume. > > > > > > The test results are as follows: > > > > > > After Boot: > > > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > > Capabilities: [110 v1] L1 PM Substates > > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > > ASPM_L1.1+ L1_PM_Substates+ > > > PortCommonModeRestoreTime=255us > > > PortTPowerOnTime=3100us > > > L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > > T_CommonMode=0us LTR1.2_Threshold=3145728ns > > > L1SubCtl2: T_PwrOn=3100us > > > > > > > > > After suspend/resume without this patch. > > > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > > Capabilities: [110 v1] L1 PM Substates > > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > > ASPM_L1.1+ L1_PM_Substates+ > > > PortCommonModeRestoreTime=255us > > > PortTPowerOnTime=3100us > > > L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > > > T_CommonMode=0us LTR1.2_Threshold=0ns > > > L1SubCtl2: T_PwrOn=10us > > > > > > > > > After suspend/resume with this patch. > > > #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > > Capabilities: [110 v1] L1 PM Substates > > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > > ASPM_L1.1+ L1_PM_Substates+ > > > PortCommonModeRestoreTime=255us > > > PortTPowerOnTime=3100us > > > L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > > T_CommonMode=0us LTR1.2_Threshold=3145728ns > > > L1SubCtl2: T_PwrOn=3100us > > > > > > > > > Tested-by: Ben Chuang <benchuanggli@gmail.com> > > > > Forgot to add mine: > > Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > > > > > > > > Best regards, > > > Ben Chuang > > > > > > > > > > --- > > > > Hi, > > > > Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > > > > on your laptop (Dell XPS 13) one last time? > > > > IMHO, the regression observed on your laptop with an old version of the patch > > > > could be due to a buggy old version BIOS in the laptop. > > > > > > > > Thanks, > > > > Vidya Sagar > > > > > > > > drivers/pci/pci.c | 7 +++++++ > > > > drivers/pci/pci.h | 4 ++++ > > > > drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > > > > 3 files changed, 55 insertions(+) > > > > > > > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > > > index cfaf40a540a8..aca05880aaa3 100644 > > > > --- a/drivers/pci/pci.c > > > > +++ b/drivers/pci/pci.c > > > > @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > > > > return i; > > > > > > > > pci_save_ltr_state(dev); > > > > + pci_save_aspm_l1ss_state(dev); > > > > pci_save_dpc_state(dev); > > > > pci_save_aer_state(dev); > > > > pci_save_ptm_state(dev); > > > > @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > > > > * LTR itself (in the PCIe capability). > > > > */ > > > > pci_restore_ltr_state(dev); > > > > + pci_restore_aspm_l1ss_state(dev); > > > > > > > > pci_restore_pcie_state(dev); > > > > pci_restore_pasid_state(dev); > > > > @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > > > > if (error) > > > > pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > > > > > > > + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > > > > + 2 * sizeof(u32)); > > > > + if (error) > > > > + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > > > > + > > > > pci_allocate_vc_save_buffers(dev); > > > > } > > > > > > > > diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > > > > index e10cdec6c56e..92d8c92662a4 100644 > > > > --- a/drivers/pci/pci.h > > > > +++ b/drivers/pci/pci.h > > > > @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > > > > void pcie_aspm_exit_link_state(struct pci_dev *pdev); > > > > void pcie_aspm_pm_state_change(struct pci_dev *pdev); > > > > void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > > > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > > > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > > > > #else > > > > static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > > > > static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > > > > static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > > > > static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > > > > +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > > > > +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > > > > #endif > > > > > > > > #ifdef CONFIG_PCIE_ECRC > > > > diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > > > > index a96b7424c9bc..2c29fdd20059 100644 > > > > --- a/drivers/pci/pcie/aspm.c > > > > +++ b/drivers/pci/pcie/aspm.c > > > > @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > > > > PCI_L1SS_CTL1_L1SS_MASK, val); > > > > } > > > > > > > > +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > > > > +{ > > > > + int aspm_l1ss; > > > > + struct pci_cap_saved_state *save_state; > > > > + u32 *cap; > > > > + > > > > + if (!pci_is_pcie(dev)) > > > > + return; > > > > + > > > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > > > + if (!aspm_l1ss) > > > > + return; > > > > + > > > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > > > + if (!save_state) > > > > + return; > > > > + > > > > + cap = (u32 *)&save_state->cap.data[0]; > > > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > > > > + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > > > > +} > > > > + > > > > +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > > > > +{ > > > > + int aspm_l1ss; > > > > + struct pci_cap_saved_state *save_state; > > > > + u32 *cap; > > > > + > > > > + if (!pci_is_pcie(dev)) > > > > + return; > > > > + > > > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > > > + if (!aspm_l1ss) > > > > + return; > > > > + > > > > + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > > > + if (!save_state) > > > > + return; > > > > + > > > > + cap = (u32 *)&save_state->cap.data[0]; > > > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > > > +} > > > > + > > > > static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > > > > { > > > > pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > > > > -- > > > > 2.17.1 > > > > > > Hi, > > With this patch (and also mentioned > https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > applied on 5.10 (chromeos-5.10) I am observing problems after > suspend/resume with my WiFi card - it looks like whole communication > via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > > I played a little bit with this code and it looks like the > pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > why, not a PCI expert). Thanks a lot for testing this! I'm not quite sure what to make of the results since v5.10 is fairly old (Dec 2020) and I don't know what other changes are in chromeos-5.10. Random observations, no analysis below. This from your dmesg certainly looks like PCI reads failing and returning ~0: Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff iwlwifi 0000:01:00.0: Device gone - attempting removal Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. And then we re-enumerate 01:00.0 and it looks like it may have been reset (BAR is 0): pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] lspci diffs from before/after suspend: 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- - Capabilities: [150 v0] Null - Capabilities: [200 v1] L1 PM Substates - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ - T_CommonMode=40us LTR1.2_Threshold=98304ns - L1SubCtl2: T_PwrOn=60us The DevSta differences might be BIOS bugs, probably not relevant. Interesting that ASPM is disabled, maybe didn't get enabled after re-enumerating 01:00.0? Strange that the L1 PM Substates capability disappeared. 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- Capabilities: [154 v1] L1 PM Substates L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ PortCommonModeRestoreTime=30us PortTPowerOnTime=60us - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ - T_CommonMode=0us LTR1.2_Threshold=98304ns + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- + T_CommonMode=0us LTR1.2_Threshold=0ns Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't get reinitialized after re-enumeration? Looks like we didn't restore L1SubCtl1. Bjorn
Agree with Bjorn's observations. The fact that the L1SS capability registers themselves disappeared in the root port post resume indicates that there seems to be something wrong with the BIOS itself. Could you please check from that perspective? Thanks, Vidya Sagar On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > External email: Use caution opening links or attachments > > > On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: >> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): >>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: >>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>> >>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't >>>>> saved and restored during suspend/resume leading to L1 Substates >>>>> configuration being lost post-resume. >>>>> >>>>> Save the L1 Substates control registers so that the configuration is >>>>> retained post-resume. >>>>> >>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> >>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> >>>> >>>> Hi Vidya, >>>> >>>> I tested this patch on kernel v5.19-rc6. >>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. >>>> This patch can restore L1SS after suspend/resume. >>>> >>>> The test results are as follows: >>>> >>>> After Boot: >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>> Capabilities: [110 v1] L1 PM Substates >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>> ASPM_L1.1+ L1_PM_Substates+ >>>> PortCommonModeRestoreTime=255us >>>> PortTPowerOnTime=3100us >>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>> L1SubCtl2: T_PwrOn=3100us >>>> >>>> >>>> After suspend/resume without this patch. >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>> Capabilities: [110 v1] L1 PM Substates >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>> ASPM_L1.1+ L1_PM_Substates+ >>>> PortCommonModeRestoreTime=255us >>>> PortTPowerOnTime=3100us >>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>> T_CommonMode=0us LTR1.2_Threshold=0ns >>>> L1SubCtl2: T_PwrOn=10us >>>> >>>> >>>> After suspend/resume with this patch. >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>> Capabilities: [110 v1] L1 PM Substates >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>> ASPM_L1.1+ L1_PM_Substates+ >>>> PortCommonModeRestoreTime=255us >>>> PortTPowerOnTime=3100us >>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>> L1SubCtl2: T_PwrOn=3100us >>>> >>>> >>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> >>> >>> Forgot to add mine: >>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> >>> >>>> >>>> Best regards, >>>> Ben Chuang >>>> >>>> >>>>> --- >>>>> Hi, >>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch >>>>> on your laptop (Dell XPS 13) one last time? >>>>> IMHO, the regression observed on your laptop with an old version of the patch >>>>> could be due to a buggy old version BIOS in the laptop. >>>>> >>>>> Thanks, >>>>> Vidya Sagar >>>>> >>>>> drivers/pci/pci.c | 7 +++++++ >>>>> drivers/pci/pci.h | 4 ++++ >>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ >>>>> 3 files changed, 55 insertions(+) >>>>> >>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c >>>>> index cfaf40a540a8..aca05880aaa3 100644 >>>>> --- a/drivers/pci/pci.c >>>>> +++ b/drivers/pci/pci.c >>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) >>>>> return i; >>>>> >>>>> pci_save_ltr_state(dev); >>>>> + pci_save_aspm_l1ss_state(dev); >>>>> pci_save_dpc_state(dev); >>>>> pci_save_aer_state(dev); >>>>> pci_save_ptm_state(dev); >>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) >>>>> * LTR itself (in the PCIe capability). >>>>> */ >>>>> pci_restore_ltr_state(dev); >>>>> + pci_restore_aspm_l1ss_state(dev); >>>>> >>>>> pci_restore_pcie_state(dev); >>>>> pci_restore_pasid_state(dev); >>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) >>>>> if (error) >>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); >>>>> >>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, >>>>> + 2 * sizeof(u32)); >>>>> + if (error) >>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); >>>>> + >>>>> pci_allocate_vc_save_buffers(dev); >>>>> } >>>>> >>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h >>>>> index e10cdec6c56e..92d8c92662a4 100644 >>>>> --- a/drivers/pci/pci.h >>>>> +++ b/drivers/pci/pci.h >>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); >>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); >>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); >>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); >>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); >>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); >>>>> #else >>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } >>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } >>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } >>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } >>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } >>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } >>>>> #endif >>>>> >>>>> #ifdef CONFIG_PCIE_ECRC >>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c >>>>> index a96b7424c9bc..2c29fdd20059 100644 >>>>> --- a/drivers/pci/pcie/aspm.c >>>>> +++ b/drivers/pci/pcie/aspm.c >>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) >>>>> PCI_L1SS_CTL1_L1SS_MASK, val); >>>>> } >>>>> >>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) >>>>> +{ >>>>> + int aspm_l1ss; >>>>> + struct pci_cap_saved_state *save_state; >>>>> + u32 *cap; >>>>> + >>>>> + if (!pci_is_pcie(dev)) >>>>> + return; >>>>> + >>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>> + if (!aspm_l1ss) >>>>> + return; >>>>> + >>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>> + if (!save_state) >>>>> + return; >>>>> + >>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); >>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); >>>>> +} >>>>> + >>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) >>>>> +{ >>>>> + int aspm_l1ss; >>>>> + struct pci_cap_saved_state *save_state; >>>>> + u32 *cap; >>>>> + >>>>> + if (!pci_is_pcie(dev)) >>>>> + return; >>>>> + >>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>> + if (!aspm_l1ss) >>>>> + return; >>>>> + >>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>> + if (!save_state) >>>>> + return; >>>>> + >>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); >>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); >>>>> +} >>>>> + >>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) >>>>> { >>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, >>>>> -- >>>>> 2.17.1 >>>>> >> >> Hi, >> >> With this patch (and also mentioned >> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) >> applied on 5.10 (chromeos-5.10) I am observing problems after >> suspend/resume with my WiFi card - it looks like whole communication >> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume >> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 >> >> I played a little bit with this code and it looks like the >> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know >> why, not a PCI expert). > > Thanks a lot for testing this! I'm not quite sure what to make of the > results since v5.10 is fairly old (Dec 2020) and I don't know what > other changes are in chromeos-5.10. > > Random observations, no analysis below. This from your dmesg > certainly looks like PCI reads failing and returning ~0: > > Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > iwlwifi 0000:01:00.0: Device gone - attempting removal > Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > > And then we re-enumerate 01:00.0 and it looks like it may have been > reset (BAR is 0): > > pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > > lspci diffs from before/after suspend: > > 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > - Capabilities: [150 v0] Null > - Capabilities: [200 v1] L1 PM Substates > - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > - T_CommonMode=40us LTR1.2_Threshold=98304ns > - L1SubCtl2: T_PwrOn=60us > > The DevSta differences might be BIOS bugs, probably not relevant. > Interesting that ASPM is disabled, maybe didn't get enabled after > re-enumerating 01:00.0? Strange that the L1 PM Substates capability > disappeared. > > 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > Capabilities: [154 v1] L1 PM Substates > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > - T_CommonMode=0us LTR1.2_Threshold=98304ns > + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > + T_CommonMode=0us LTR1.2_Threshold=0ns > > Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > get reinitialized after re-enumeration? Looks like we didn't restore > L1SubCtl1. > > Bjorn >
Hello, On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: > > Agree with Bjorn's observations. > The fact that the L1SS capability registers themselves disappeared in > the root port post resume indicates that there seems to be something > wrong with the BIOS itself. > Could you please check from that perspective? ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This is a shallower sleep state that preserves more state than, for e.g. S3 (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture at all. i.e. after the kernel runs its suspend routines, it just puts the CPU into S0ix state. So I do not think there is a BIOS angle to this. > > Thanks, > Vidya Sagar > > > On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > > External email: Use caution opening links or attachments > > > > > > On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > >> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > >>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > >>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>> > >>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > >>>>> saved and restored during suspend/resume leading to L1 Substates > >>>>> configuration being lost post-resume. > >>>>> > >>>>> Save the L1 Substates control registers so that the configuration is > >>>>> retained post-resume. > >>>>> > >>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > >>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > >>>> > >>>> Hi Vidya, > >>>> > >>>> I tested this patch on kernel v5.19-rc6. > >>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. > >>>> This patch can restore L1SS after suspend/resume. > >>>> > >>>> The test results are as follows: > >>>> > >>>> After Boot: > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>> Capabilities: [110 v1] L1 PM Substates > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>> ASPM_L1.1+ L1_PM_Substates+ > >>>> PortCommonModeRestoreTime=255us > >>>> PortTPowerOnTime=3100us > >>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>> L1SubCtl2: T_PwrOn=3100us > >>>> > >>>> > >>>> After suspend/resume without this patch. > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>> Capabilities: [110 v1] L1 PM Substates > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>> ASPM_L1.1+ L1_PM_Substates+ > >>>> PortCommonModeRestoreTime=255us > >>>> PortTPowerOnTime=3100us > >>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>> T_CommonMode=0us LTR1.2_Threshold=0ns > >>>> L1SubCtl2: T_PwrOn=10us > >>>> > >>>> > >>>> After suspend/resume with this patch. > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>> Capabilities: [110 v1] L1 PM Substates > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>> ASPM_L1.1+ L1_PM_Substates+ > >>>> PortCommonModeRestoreTime=255us > >>>> PortTPowerOnTime=3100us > >>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>> L1SubCtl2: T_PwrOn=3100us > >>>> > >>>> > >>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> > >>> > >>> Forgot to add mine: > >>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > >>> > >>>> > >>>> Best regards, > >>>> Ben Chuang > >>>> > >>>> > >>>>> --- > >>>>> Hi, > >>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > >>>>> on your laptop (Dell XPS 13) one last time? > >>>>> IMHO, the regression observed on your laptop with an old version of the patch > >>>>> could be due to a buggy old version BIOS in the laptop. > >>>>> > >>>>> Thanks, > >>>>> Vidya Sagar > >>>>> > >>>>> drivers/pci/pci.c | 7 +++++++ > >>>>> drivers/pci/pci.h | 4 ++++ > >>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > >>>>> 3 files changed, 55 insertions(+) > >>>>> > >>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > >>>>> index cfaf40a540a8..aca05880aaa3 100644 > >>>>> --- a/drivers/pci/pci.c > >>>>> +++ b/drivers/pci/pci.c > >>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > >>>>> return i; > >>>>> > >>>>> pci_save_ltr_state(dev); > >>>>> + pci_save_aspm_l1ss_state(dev); > >>>>> pci_save_dpc_state(dev); > >>>>> pci_save_aer_state(dev); > >>>>> pci_save_ptm_state(dev); > >>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > >>>>> * LTR itself (in the PCIe capability). > >>>>> */ > >>>>> pci_restore_ltr_state(dev); > >>>>> + pci_restore_aspm_l1ss_state(dev); > >>>>> > >>>>> pci_restore_pcie_state(dev); > >>>>> pci_restore_pasid_state(dev); > >>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > >>>>> if (error) > >>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > >>>>> > >>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > >>>>> + 2 * sizeof(u32)); > >>>>> + if (error) > >>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > >>>>> + > >>>>> pci_allocate_vc_save_buffers(dev); > >>>>> } > >>>>> > >>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > >>>>> index e10cdec6c56e..92d8c92662a4 100644 > >>>>> --- a/drivers/pci/pci.h > >>>>> +++ b/drivers/pci/pci.h > >>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > >>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); > >>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); > >>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > >>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > >>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > >>>>> #else > >>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > >>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > >>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > >>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > >>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>> #endif > >>>>> > >>>>> #ifdef CONFIG_PCIE_ECRC > >>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > >>>>> index a96b7424c9bc..2c29fdd20059 100644 > >>>>> --- a/drivers/pci/pcie/aspm.c > >>>>> +++ b/drivers/pci/pcie/aspm.c > >>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > >>>>> PCI_L1SS_CTL1_L1SS_MASK, val); > >>>>> } > >>>>> > >>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > >>>>> +{ > >>>>> + int aspm_l1ss; > >>>>> + struct pci_cap_saved_state *save_state; > >>>>> + u32 *cap; > >>>>> + > >>>>> + if (!pci_is_pcie(dev)) > >>>>> + return; > >>>>> + > >>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>> + if (!aspm_l1ss) > >>>>> + return; > >>>>> + > >>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>> + if (!save_state) > >>>>> + return; > >>>>> + > >>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > >>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > >>>>> +} > >>>>> + > >>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > >>>>> +{ > >>>>> + int aspm_l1ss; > >>>>> + struct pci_cap_saved_state *save_state; > >>>>> + u32 *cap; > >>>>> + > >>>>> + if (!pci_is_pcie(dev)) > >>>>> + return; > >>>>> + > >>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>> + if (!aspm_l1ss) > >>>>> + return; > >>>>> + > >>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>> + if (!save_state) > >>>>> + return; > >>>>> + > >>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > >>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > >>>>> +} > >>>>> + > >>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > >>>>> { > >>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > >>>>> -- > >>>>> 2.17.1 > >>>>> > >> > >> Hi, > >> > >> With this patch (and also mentioned > >> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > >> applied on 5.10 (chromeos-5.10) I am observing problems after > >> suspend/resume with my WiFi card - it looks like whole communication > >> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > >> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > >> > >> I played a little bit with this code and it looks like the > >> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > >> why, not a PCI expert). > > > > Thanks a lot for testing this! I'm not quite sure what to make of the > > results since v5.10 is fairly old (Dec 2020) and I don't know what > > other changes are in chromeos-5.10. Lukasz: I assume you are running this on Atlas and are seeing this bug when uprev'ving it to 5.10 kernel. Can you please try it on a newer Intel platform that have the latest upstream kernel running already and see if this can be reproduced there too? Note that the wifi PCI device is different on newer Intel platforms, but platform design is similar enough that I suspect we should see similar bug on those too. The other option is to try the latest ustream kernel on Atlas. Perhaps if we just care about wifi (and ignore bringing up the graphics stack and GUI), it may come up sufficiently enough to try this patch? Thanks, Rajat > > > > Random observations, no analysis below. This from your dmesg > > certainly looks like PCI reads failing and returning ~0: > > > > Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > > iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > > iwlwifi 0000:01:00.0: Device gone - attempting removal > > Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > > > > And then we re-enumerate 01:00.0 and it looks like it may have been > > reset (BAR is 0): > > > > pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > > pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > > > > lspci diffs from before/after suspend: > > > > 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > > Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > > - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > > + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > > - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > > + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > > - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > > + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > > - Capabilities: [150 v0] Null > > - Capabilities: [200 v1] L1 PM Substates > > - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > > - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > > - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > - T_CommonMode=40us LTR1.2_Threshold=98304ns > > - L1SubCtl2: T_PwrOn=60us > > > > The DevSta differences might be BIOS bugs, probably not relevant. > > Interesting that ASPM is disabled, maybe didn't get enabled after > > re-enumerating 01:00.0? Strange that the L1 PM Substates capability > > disappeared. > > > > 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > > LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > > - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > > + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > > Capabilities: [154 v1] L1 PM Substates > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > > PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > > - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > - T_CommonMode=0us LTR1.2_Threshold=98304ns > > + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > > + T_CommonMode=0us LTR1.2_Threshold=0ns > > > > Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > > get reinitialized after re-enumeration? Looks like we didn't restore > > L1SubCtl1. > > > > Bjorn > >
wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): > > Hello, > > On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: > > > > Agree with Bjorn's observations. > > The fact that the L1SS capability registers themselves disappeared in > > the root port post resume indicates that there seems to be something > > wrong with the BIOS itself. > > Could you please check from that perspective? > > ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This > is a shallower sleep state that preserves more state than, for e.g. S3 > (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture > at all. i.e. after the kernel runs its suspend routines, it just puts > the CPU into S0ix state. So I do not think there is a BIOS angle to > this. > > > > > > Thanks, > > Vidya Sagar > > > > > > On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > > > External email: Use caution opening links or attachments > > > > > > > > > On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > > >> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > > >>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > > >>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > > >>>>> > > >>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > > >>>>> saved and restored during suspend/resume leading to L1 Substates > > >>>>> configuration being lost post-resume. > > >>>>> > > >>>>> Save the L1 Substates control registers so that the configuration is > > >>>>> retained post-resume. > > >>>>> > > >>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > > >>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > > >>>> > > >>>> Hi Vidya, > > >>>> > > >>>> I tested this patch on kernel v5.19-rc6. > > >>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. > > >>>> This patch can restore L1SS after suspend/resume. > > >>>> > > >>>> The test results are as follows: > > >>>> > > >>>> After Boot: > > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > >>>> Capabilities: [110 v1] L1 PM Substates > > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > >>>> ASPM_L1.1+ L1_PM_Substates+ > > >>>> PortCommonModeRestoreTime=255us > > >>>> PortTPowerOnTime=3100us > > >>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > >>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > > >>>> L1SubCtl2: T_PwrOn=3100us > > >>>> > > >>>> > > >>>> After suspend/resume without this patch. > > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > >>>> Capabilities: [110 v1] L1 PM Substates > > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > >>>> ASPM_L1.1+ L1_PM_Substates+ > > >>>> PortCommonModeRestoreTime=255us > > >>>> PortTPowerOnTime=3100us > > >>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > > >>>> T_CommonMode=0us LTR1.2_Threshold=0ns > > >>>> L1SubCtl2: T_PwrOn=10us > > >>>> > > >>>> > > >>>> After suspend/resume with this patch. > > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > >>>> Capabilities: [110 v1] L1 PM Substates > > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > >>>> ASPM_L1.1+ L1_PM_Substates+ > > >>>> PortCommonModeRestoreTime=255us > > >>>> PortTPowerOnTime=3100us > > >>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > >>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > > >>>> L1SubCtl2: T_PwrOn=3100us > > >>>> > > >>>> > > >>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> > > >>> > > >>> Forgot to add mine: > > >>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > > >>> > > >>>> > > >>>> Best regards, > > >>>> Ben Chuang > > >>>> > > >>>> > > >>>>> --- > > >>>>> Hi, > > >>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > > >>>>> on your laptop (Dell XPS 13) one last time? > > >>>>> IMHO, the regression observed on your laptop with an old version of the patch > > >>>>> could be due to a buggy old version BIOS in the laptop. > > >>>>> > > >>>>> Thanks, > > >>>>> Vidya Sagar > > >>>>> > > >>>>> drivers/pci/pci.c | 7 +++++++ > > >>>>> drivers/pci/pci.h | 4 ++++ > > >>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > > >>>>> 3 files changed, 55 insertions(+) > > >>>>> > > >>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > >>>>> index cfaf40a540a8..aca05880aaa3 100644 > > >>>>> --- a/drivers/pci/pci.c > > >>>>> +++ b/drivers/pci/pci.c > > >>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > > >>>>> return i; > > >>>>> > > >>>>> pci_save_ltr_state(dev); > > >>>>> + pci_save_aspm_l1ss_state(dev); > > >>>>> pci_save_dpc_state(dev); > > >>>>> pci_save_aer_state(dev); > > >>>>> pci_save_ptm_state(dev); > > >>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > > >>>>> * LTR itself (in the PCIe capability). > > >>>>> */ > > >>>>> pci_restore_ltr_state(dev); > > >>>>> + pci_restore_aspm_l1ss_state(dev); > > >>>>> > > >>>>> pci_restore_pcie_state(dev); > > >>>>> pci_restore_pasid_state(dev); > > >>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > > >>>>> if (error) > > >>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > >>>>> > > >>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > > >>>>> + 2 * sizeof(u32)); > > >>>>> + if (error) > > >>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > > >>>>> + > > >>>>> pci_allocate_vc_save_buffers(dev); > > >>>>> } > > >>>>> > > >>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > > >>>>> index e10cdec6c56e..92d8c92662a4 100644 > > >>>>> --- a/drivers/pci/pci.h > > >>>>> +++ b/drivers/pci/pci.h > > >>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > > >>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); > > >>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); > > >>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > > >>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > > >>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > > >>>>> #else > > >>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > > >>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > > >>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > > >>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > > >>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > > >>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > > >>>>> #endif > > >>>>> > > >>>>> #ifdef CONFIG_PCIE_ECRC > > >>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > > >>>>> index a96b7424c9bc..2c29fdd20059 100644 > > >>>>> --- a/drivers/pci/pcie/aspm.c > > >>>>> +++ b/drivers/pci/pcie/aspm.c > > >>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > > >>>>> PCI_L1SS_CTL1_L1SS_MASK, val); > > >>>>> } > > >>>>> > > >>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > > >>>>> +{ > > >>>>> + int aspm_l1ss; > > >>>>> + struct pci_cap_saved_state *save_state; > > >>>>> + u32 *cap; > > >>>>> + > > >>>>> + if (!pci_is_pcie(dev)) > > >>>>> + return; > > >>>>> + > > >>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > >>>>> + if (!aspm_l1ss) > > >>>>> + return; > > >>>>> + > > >>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > >>>>> + if (!save_state) > > >>>>> + return; > > >>>>> + > > >>>>> + cap = (u32 *)&save_state->cap.data[0]; > > >>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > > >>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > > >>>>> +} > > >>>>> + > > >>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > > >>>>> +{ > > >>>>> + int aspm_l1ss; > > >>>>> + struct pci_cap_saved_state *save_state; > > >>>>> + u32 *cap; > > >>>>> + > > >>>>> + if (!pci_is_pcie(dev)) > > >>>>> + return; > > >>>>> + > > >>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > >>>>> + if (!aspm_l1ss) > > >>>>> + return; > > >>>>> + > > >>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > >>>>> + if (!save_state) > > >>>>> + return; > > >>>>> + > > >>>>> + cap = (u32 *)&save_state->cap.data[0]; > > >>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > >>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > >>>>> +} > > >>>>> + > > >>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > > >>>>> { > > >>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > > >>>>> -- > > >>>>> 2.17.1 > > >>>>> > > >> > > >> Hi, > > >> > > >> With this patch (and also mentioned > > >> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > > >> applied on 5.10 (chromeos-5.10) I am observing problems after > > >> suspend/resume with my WiFi card - it looks like whole communication > > >> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > > >> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > > >> > > >> I played a little bit with this code and it looks like the > > >> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > > >> why, not a PCI expert). > > > > > > Thanks a lot for testing this! I'm not quite sure what to make of the > > > results since v5.10 is fairly old (Dec 2020) and I don't know what > > > other changes are in chromeos-5.10. > > Lukasz: I assume you are running this on Atlas and are seeing this bug > when uprev'ving it to 5.10 kernel. Can you please try it on a newer > Intel platform that have the latest upstream kernel running already > and see if this can be reproduced there too? > Note that the wifi PCI device is different on newer Intel platforms, > but platform design is similar enough that I suspect we should see > similar bug on those too. The other option is to try the latest > ustream kernel on Atlas. Perhaps if we just care about wifi (and > ignore bringing up the graphics stack and GUI), it may come up > sufficiently enough to try this patch? > > Thanks, > > Rajat > > > > > > > > Random observations, no analysis below. This from your dmesg > > > certainly looks like PCI reads failing and returning ~0: > > > > > > Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > > > iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > > > iwlwifi 0000:01:00.0: Device gone - attempting removal > > > Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > > > > > > And then we re-enumerate 01:00.0 and it looks like it may have been > > > reset (BAR is 0): > > > > > > pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > > > pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > > > > > > lspci diffs from before/after suspend: > > > > > > 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > > > Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > > > - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > > > + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > > > - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > > > + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > > > - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > > > + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > > > - Capabilities: [150 v0] Null > > > - Capabilities: [200 v1] L1 PM Substates > > > - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > > > - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > > > - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > > - T_CommonMode=40us LTR1.2_Threshold=98304ns > > > - L1SubCtl2: T_PwrOn=60us > > > > > > The DevSta differences might be BIOS bugs, probably not relevant. > > > Interesting that ASPM is disabled, maybe didn't get enabled after > > > re-enumerating 01:00.0? Strange that the L1 PM Substates capability > > > disappeared. > > > > > > 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > > > LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > > > - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > > > + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > > > Capabilities: [154 v1] L1 PM Substates > > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > > > PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > > > - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > > - T_CommonMode=0us LTR1.2_Threshold=98304ns > > > + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > > > + T_CommonMode=0us LTR1.2_Threshold=0ns > > > > > > Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > > > get reinitialized after re-enumeration? Looks like we didn't restore > > > L1SubCtl1. > > > > > > Bjorn > > > Hi, Thank you all for the response and input! As Rajat mentioned I'm using chromebook - but not Atlas (Amberlake) - in this case it is Babymega (Apollolake) - I will try to load most recent kernel and give it a try once again. Best regards, Lukasz
wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): > > wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): > > > > Hello, > > > > On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: > > > > > > Agree with Bjorn's observations. > > > The fact that the L1SS capability registers themselves disappeared in > > > the root port post resume indicates that there seems to be something > > > wrong with the BIOS itself. > > > Could you please check from that perspective? > > > > ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This > > is a shallower sleep state that preserves more state than, for e.g. S3 > > (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture > > at all. i.e. after the kernel runs its suspend routines, it just puts > > the CPU into S0ix state. So I do not think there is a BIOS angle to > > this. > > > > > > > > > > Thanks, > > > Vidya Sagar > > > > > > > > > On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > > > > External email: Use caution opening links or attachments > > > > > > > > > > > > On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > > > >> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > > > >>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > > > >>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > > > >>>>> > > > >>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > > > >>>>> saved and restored during suspend/resume leading to L1 Substates > > > >>>>> configuration being lost post-resume. > > > >>>>> > > > >>>>> Save the L1 Substates control registers so that the configuration is > > > >>>>> retained post-resume. > > > >>>>> > > > >>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > > > >>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > > > >>>> > > > >>>> Hi Vidya, > > > >>>> > > > >>>> I tested this patch on kernel v5.19-rc6. > > > >>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. > > > >>>> This patch can restore L1SS after suspend/resume. > > > >>>> > > > >>>> The test results are as follows: > > > >>>> > > > >>>> After Boot: > > > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > > >>>> Capabilities: [110 v1] L1 PM Substates > > > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > > >>>> ASPM_L1.1+ L1_PM_Substates+ > > > >>>> PortCommonModeRestoreTime=255us > > > >>>> PortTPowerOnTime=3100us > > > >>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > > >>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > > > >>>> L1SubCtl2: T_PwrOn=3100us > > > >>>> > > > >>>> > > > >>>> After suspend/resume without this patch. > > > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > > >>>> Capabilities: [110 v1] L1 PM Substates > > > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > > >>>> ASPM_L1.1+ L1_PM_Substates+ > > > >>>> PortCommonModeRestoreTime=255us > > > >>>> PortTPowerOnTime=3100us > > > >>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > > > >>>> T_CommonMode=0us LTR1.2_Threshold=0ns > > > >>>> L1SubCtl2: T_PwrOn=10us > > > >>>> > > > >>>> > > > >>>> After suspend/resume with this patch. > > > >>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > > > >>>> Capabilities: [110 v1] L1 PM Substates > > > >>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > > > >>>> ASPM_L1.1+ L1_PM_Substates+ > > > >>>> PortCommonModeRestoreTime=255us > > > >>>> PortTPowerOnTime=3100us > > > >>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > > >>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > > > >>>> L1SubCtl2: T_PwrOn=3100us > > > >>>> > > > >>>> > > > >>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> > > > >>> > > > >>> Forgot to add mine: > > > >>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > > > >>> > > > >>>> > > > >>>> Best regards, > > > >>>> Ben Chuang > > > >>>> > > > >>>> > > > >>>>> --- > > > >>>>> Hi, > > > >>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > > > >>>>> on your laptop (Dell XPS 13) one last time? > > > >>>>> IMHO, the regression observed on your laptop with an old version of the patch > > > >>>>> could be due to a buggy old version BIOS in the laptop. > > > >>>>> > > > >>>>> Thanks, > > > >>>>> Vidya Sagar > > > >>>>> > > > >>>>> drivers/pci/pci.c | 7 +++++++ > > > >>>>> drivers/pci/pci.h | 4 ++++ > > > >>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > > > >>>>> 3 files changed, 55 insertions(+) > > > >>>>> > > > >>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > > > >>>>> index cfaf40a540a8..aca05880aaa3 100644 > > > >>>>> --- a/drivers/pci/pci.c > > > >>>>> +++ b/drivers/pci/pci.c > > > >>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > > > >>>>> return i; > > > >>>>> > > > >>>>> pci_save_ltr_state(dev); > > > >>>>> + pci_save_aspm_l1ss_state(dev); > > > >>>>> pci_save_dpc_state(dev); > > > >>>>> pci_save_aer_state(dev); > > > >>>>> pci_save_ptm_state(dev); > > > >>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > > > >>>>> * LTR itself (in the PCIe capability). > > > >>>>> */ > > > >>>>> pci_restore_ltr_state(dev); > > > >>>>> + pci_restore_aspm_l1ss_state(dev); > > > >>>>> > > > >>>>> pci_restore_pcie_state(dev); > > > >>>>> pci_restore_pasid_state(dev); > > > >>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > > > >>>>> if (error) > > > >>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > > > >>>>> > > > >>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > > > >>>>> + 2 * sizeof(u32)); > > > >>>>> + if (error) > > > >>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > > > >>>>> + > > > >>>>> pci_allocate_vc_save_buffers(dev); > > > >>>>> } > > > >>>>> > > > >>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > > > >>>>> index e10cdec6c56e..92d8c92662a4 100644 > > > >>>>> --- a/drivers/pci/pci.h > > > >>>>> +++ b/drivers/pci/pci.h > > > >>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > > > >>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); > > > >>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); > > > >>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > > > >>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > > > >>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > > > >>>>> #else > > > >>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > > > >>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > > > >>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > > > >>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > > > >>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > > > >>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > > > >>>>> #endif > > > >>>>> > > > >>>>> #ifdef CONFIG_PCIE_ECRC > > > >>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > > > >>>>> index a96b7424c9bc..2c29fdd20059 100644 > > > >>>>> --- a/drivers/pci/pcie/aspm.c > > > >>>>> +++ b/drivers/pci/pcie/aspm.c > > > >>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > > > >>>>> PCI_L1SS_CTL1_L1SS_MASK, val); > > > >>>>> } > > > >>>>> > > > >>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > > > >>>>> +{ > > > >>>>> + int aspm_l1ss; > > > >>>>> + struct pci_cap_saved_state *save_state; > > > >>>>> + u32 *cap; > > > >>>>> + > > > >>>>> + if (!pci_is_pcie(dev)) > > > >>>>> + return; > > > >>>>> + > > > >>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > > >>>>> + if (!aspm_l1ss) > > > >>>>> + return; > > > >>>>> + > > > >>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > > >>>>> + if (!save_state) > > > >>>>> + return; > > > >>>>> + > > > >>>>> + cap = (u32 *)&save_state->cap.data[0]; > > > >>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > > > >>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > > > >>>>> +} > > > >>>>> + > > > >>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > > > >>>>> +{ > > > >>>>> + int aspm_l1ss; > > > >>>>> + struct pci_cap_saved_state *save_state; > > > >>>>> + u32 *cap; > > > >>>>> + > > > >>>>> + if (!pci_is_pcie(dev)) > > > >>>>> + return; > > > >>>>> + > > > >>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > > >>>>> + if (!aspm_l1ss) > > > >>>>> + return; > > > >>>>> + > > > >>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > > > >>>>> + if (!save_state) > > > >>>>> + return; > > > >>>>> + > > > >>>>> + cap = (u32 *)&save_state->cap.data[0]; > > > >>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > > >>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > > >>>>> +} > > > >>>>> + > > > >>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > > > >>>>> { > > > >>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > > > >>>>> -- > > > >>>>> 2.17.1 > > > >>>>> > > > >> > > > >> Hi, > > > >> > > > >> With this patch (and also mentioned > > > >> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > > > >> applied on 5.10 (chromeos-5.10) I am observing problems after > > > >> suspend/resume with my WiFi card - it looks like whole communication > > > >> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > > > >> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > > > >> > > > >> I played a little bit with this code and it looks like the > > > >> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > > > >> why, not a PCI expert). > > > > > > > > Thanks a lot for testing this! I'm not quite sure what to make of the > > > > results since v5.10 is fairly old (Dec 2020) and I don't know what > > > > other changes are in chromeos-5.10. > > > > Lukasz: I assume you are running this on Atlas and are seeing this bug > > when uprev'ving it to 5.10 kernel. Can you please try it on a newer > > Intel platform that have the latest upstream kernel running already > > and see if this can be reproduced there too? > > Note that the wifi PCI device is different on newer Intel platforms, > > but platform design is similar enough that I suspect we should see > > similar bug on those too. The other option is to try the latest > > ustream kernel on Atlas. Perhaps if we just care about wifi (and > > ignore bringing up the graphics stack and GUI), it may come up > > sufficiently enough to try this patch? > > > > Thanks, > > > > Rajat > > > > > > > > > > > > Random observations, no analysis below. This from your dmesg > > > > certainly looks like PCI reads failing and returning ~0: > > > > > > > > Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > > > > iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > > > > iwlwifi 0000:01:00.0: Device gone - attempting removal > > > > Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > > > > > > > > And then we re-enumerate 01:00.0 and it looks like it may have been > > > > reset (BAR is 0): > > > > > > > > pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > > > > pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > > > > > > > > lspci diffs from before/after suspend: > > > > > > > > 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > > > > Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > > > > - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > > > > + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > > > > - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > > > > + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > > > > - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > > > > + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > > > > - Capabilities: [150 v0] Null > > > > - Capabilities: [200 v1] L1 PM Substates > > > > - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > > > > - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > > > > - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > > > - T_CommonMode=40us LTR1.2_Threshold=98304ns > > > > - L1SubCtl2: T_PwrOn=60us > > > > > > > > The DevSta differences might be BIOS bugs, probably not relevant. > > > > Interesting that ASPM is disabled, maybe didn't get enabled after > > > > re-enumerating 01:00.0? Strange that the L1 PM Substates capability > > > > disappeared. > > > > > > > > 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > > > > LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > > > > - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > > > > + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > > > > Capabilities: [154 v1] L1 PM Substates > > > > L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > > > > PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > > > > - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > > > > - T_CommonMode=0us LTR1.2_Threshold=98304ns > > > > + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > > > > + T_CommonMode=0us LTR1.2_Threshold=0ns > > > > > > > > Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > > > > get reinitialized after re-enumeration? Looks like we didn't restore > > > > L1SubCtl1. > > > > > > > > Bjorn > > > > > > Hi, > > Thank you all for the response and input! As Rajat mentioned I'm using > chromebook - but not Atlas (Amberlake) - in this case it is Babymega > (Apollolake) - I will try to load most recent kernel and give it a > try once again. > > Best regards, > Lukasz Hi, I have applied this patch on top of v5.19-rc7 (chromeos) and I'm still getting same results: https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 Best regards, Lukasz
Hi Lukasz, Thanks for sharing your observations. Could you please also share the output of 'sudo lspci -vvvv' before and after suspend-resume cycle with the latest linux-next? Do we still see the L1SS capabilities getting disappeared post resume? Thanks, Vidya Sagar On 7/29/2022 3:09 PM, Lukasz Majczak wrote: > External email: Use caution opening links or attachments > > > wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): >> >> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): >>> >>> Hello, >>> >>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: >>>> >>>> Agree with Bjorn's observations. >>>> The fact that the L1SS capability registers themselves disappeared in >>>> the root port post resume indicates that there seems to be something >>>> wrong with the BIOS itself. >>>> Could you please check from that perspective? >>> >>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This >>> is a shallower sleep state that preserves more state than, for e.g. S3 >>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture >>> at all. i.e. after the kernel runs its suspend routines, it just puts >>> the CPU into S0ix state. So I do not think there is a BIOS angle to >>> this. >>> >>> >>>> >>>> Thanks, >>>> Vidya Sagar >>>> >>>> >>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: >>>>> External email: Use caution opening links or attachments >>>>> >>>>> >>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: >>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): >>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: >>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>>>>> >>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't >>>>>>>>> saved and restored during suspend/resume leading to L1 Substates >>>>>>>>> configuration being lost post-resume. >>>>>>>>> >>>>>>>>> Save the L1 Substates control registers so that the configuration is >>>>>>>>> retained post-resume. >>>>>>>>> >>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> >>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> >>>>>>>> >>>>>>>> Hi Vidya, >>>>>>>> >>>>>>>> I tested this patch on kernel v5.19-rc6. >>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. >>>>>>>> This patch can restore L1SS after suspend/resume. >>>>>>>> >>>>>>>> The test results are as follows: >>>>>>>> >>>>>>>> After Boot: >>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>> PortTPowerOnTime=3100us >>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>> >>>>>>>> >>>>>>>> After suspend/resume without this patch. >>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>> PortTPowerOnTime=3100us >>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>>> L1SubCtl2: T_PwrOn=10us >>>>>>>> >>>>>>>> >>>>>>>> After suspend/resume with this patch. >>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>> PortTPowerOnTime=3100us >>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>> >>>>>>>> >>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> >>>>>>> >>>>>>> Forgot to add mine: >>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> >>>>>>> >>>>>>>> >>>>>>>> Best regards, >>>>>>>> Ben Chuang >>>>>>>> >>>>>>>> >>>>>>>>> --- >>>>>>>>> Hi, >>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch >>>>>>>>> on your laptop (Dell XPS 13) one last time? >>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch >>>>>>>>> could be due to a buggy old version BIOS in the laptop. >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> Vidya Sagar >>>>>>>>> >>>>>>>>> drivers/pci/pci.c | 7 +++++++ >>>>>>>>> drivers/pci/pci.h | 4 ++++ >>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ >>>>>>>>> 3 files changed, 55 insertions(+) >>>>>>>>> >>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c >>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 >>>>>>>>> --- a/drivers/pci/pci.c >>>>>>>>> +++ b/drivers/pci/pci.c >>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) >>>>>>>>> return i; >>>>>>>>> >>>>>>>>> pci_save_ltr_state(dev); >>>>>>>>> + pci_save_aspm_l1ss_state(dev); >>>>>>>>> pci_save_dpc_state(dev); >>>>>>>>> pci_save_aer_state(dev); >>>>>>>>> pci_save_ptm_state(dev); >>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) >>>>>>>>> * LTR itself (in the PCIe capability). >>>>>>>>> */ >>>>>>>>> pci_restore_ltr_state(dev); >>>>>>>>> + pci_restore_aspm_l1ss_state(dev); >>>>>>>>> >>>>>>>>> pci_restore_pcie_state(dev); >>>>>>>>> pci_restore_pasid_state(dev); >>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) >>>>>>>>> if (error) >>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); >>>>>>>>> >>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, >>>>>>>>> + 2 * sizeof(u32)); >>>>>>>>> + if (error) >>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); >>>>>>>>> + >>>>>>>>> pci_allocate_vc_save_buffers(dev); >>>>>>>>> } >>>>>>>>> >>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h >>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 >>>>>>>>> --- a/drivers/pci/pci.h >>>>>>>>> +++ b/drivers/pci/pci.h >>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); >>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); >>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); >>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); >>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>> #else >>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } >>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } >>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } >>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } >>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>> #endif >>>>>>>>> >>>>>>>>> #ifdef CONFIG_PCIE_ECRC >>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c >>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 >>>>>>>>> --- a/drivers/pci/pcie/aspm.c >>>>>>>>> +++ b/drivers/pci/pcie/aspm.c >>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) >>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); >>>>>>>>> } >>>>>>>>> >>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>> +{ >>>>>>>>> + int aspm_l1ss; >>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>> + u32 *cap; >>>>>>>>> + >>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>> + return; >>>>>>>>> + >>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>> + if (!aspm_l1ss) >>>>>>>>> + return; >>>>>>>>> + >>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>> + if (!save_state) >>>>>>>>> + return; >>>>>>>>> + >>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); >>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); >>>>>>>>> +} >>>>>>>>> + >>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>> +{ >>>>>>>>> + int aspm_l1ss; >>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>> + u32 *cap; >>>>>>>>> + >>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>> + return; >>>>>>>>> + >>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>> + if (!aspm_l1ss) >>>>>>>>> + return; >>>>>>>>> + >>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>> + if (!save_state) >>>>>>>>> + return; >>>>>>>>> + >>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); >>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); >>>>>>>>> +} >>>>>>>>> + >>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) >>>>>>>>> { >>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, >>>>>>>>> -- >>>>>>>>> 2.17.1 >>>>>>>>> >>>>>> >>>>>> Hi, >>>>>> >>>>>> With this patch (and also mentioned >>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) >>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after >>>>>> suspend/resume with my WiFi card - it looks like whole communication >>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume >>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 >>>>>> >>>>>> I played a little bit with this code and it looks like the >>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know >>>>>> why, not a PCI expert). >>>>> >>>>> Thanks a lot for testing this! I'm not quite sure what to make of the >>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what >>>>> other changes are in chromeos-5.10. >>> >>> Lukasz: I assume you are running this on Atlas and are seeing this bug >>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer >>> Intel platform that have the latest upstream kernel running already >>> and see if this can be reproduced there too? >>> Note that the wifi PCI device is different on newer Intel platforms, >>> but platform design is similar enough that I suspect we should see >>> similar bug on those too. The other option is to try the latest >>> ustream kernel on Atlas. Perhaps if we just care about wifi (and >>> ignore bringing up the graphics stack and GUI), it may come up >>> sufficiently enough to try this patch? >>> >>> Thanks, >>> >>> Rajat >>> >>> >>>>> >>>>> Random observations, no analysis below. This from your dmesg >>>>> certainly looks like PCI reads failing and returning ~0: >>>>> >>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) >>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff >>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal >>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. >>>>> >>>>> And then we re-enumerate 01:00.0 and it looks like it may have been >>>>> reset (BAR is 0): >>>>> >>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 >>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] >>>>> >>>>> lspci diffs from before/after suspend: >>>>> >>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) >>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 >>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- >>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- >>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ >>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- >>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- >>>>> - Capabilities: [150 v0] Null >>>>> - Capabilities: [200 v1] L1 PM Substates >>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us >>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns >>>>> - L1SubCtl2: T_PwrOn=60us >>>>> >>>>> The DevSta differences might be BIOS bugs, probably not relevant. >>>>> Interesting that ASPM is disabled, maybe didn't get enabled after >>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability >>>>> disappeared. >>>>> >>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) >>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- >>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- >>>>> Capabilities: [154 v1] L1 PM Substates >>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us >>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns >>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns >>>>> >>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't >>>>> get reinitialized after re-enumeration? Looks like we didn't restore >>>>> L1SubCtl1. >>>>> >>>>> Bjorn >>>>> >> >> Hi, >> >> Thank you all for the response and input! As Rajat mentioned I'm using >> chromebook - but not Atlas (Amberlake) - in this case it is Babymega >> (Apollolake) - I will try to load most recent kernel and give it a >> try once again. >> >> Best regards, >> Lukasz > > Hi, > > I have applied this patch on top of v5.19-rc7 (chromeos) and I'm > still getting same results: > https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 > > Best regards, > Lukasz >
pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): > > Hi Lukasz, > Thanks for sharing your observations. > > Could you please also share the output of 'sudo lspci -vvvv' before and > after suspend-resume cycle with the latest linux-next? > Do we still see the L1SS capabilities getting disappeared post resume? > > Thanks, > Vidya Sagar > > On 7/29/2022 3:09 PM, Lukasz Majczak wrote: > > External email: Use caution opening links or attachments > > > > > > wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): > >> > >> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): > >>> > >>> Hello, > >>> > >>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>> > >>>> Agree with Bjorn's observations. > >>>> The fact that the L1SS capability registers themselves disappeared in > >>>> the root port post resume indicates that there seems to be something > >>>> wrong with the BIOS itself. > >>>> Could you please check from that perspective? > >>> > >>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This > >>> is a shallower sleep state that preserves more state than, for e.g. S3 > >>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture > >>> at all. i.e. after the kernel runs its suspend routines, it just puts > >>> the CPU into S0ix state. So I do not think there is a BIOS angle to > >>> this. > >>> > >>> > >>>> > >>>> Thanks, > >>>> Vidya Sagar > >>>> > >>>> > >>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > >>>>> External email: Use caution opening links or attachments > >>>>> > >>>>> > >>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > >>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > >>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > >>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>>>>> > >>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > >>>>>>>>> saved and restored during suspend/resume leading to L1 Substates > >>>>>>>>> configuration being lost post-resume. > >>>>>>>>> > >>>>>>>>> Save the L1 Substates control registers so that the configuration is > >>>>>>>>> retained post-resume. > >>>>>>>>> > >>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > >>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > >>>>>>>> > >>>>>>>> Hi Vidya, > >>>>>>>> > >>>>>>>> I tested this patch on kernel v5.19-rc6. > >>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. > >>>>>>>> This patch can restore L1SS after suspend/resume. > >>>>>>>> > >>>>>>>> The test results are as follows: > >>>>>>>> > >>>>>>>> After Boot: > >>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>> PortTPowerOnTime=3100us > >>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>> > >>>>>>>> > >>>>>>>> After suspend/resume without this patch. > >>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>> PortTPowerOnTime=3100us > >>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>>> L1SubCtl2: T_PwrOn=10us > >>>>>>>> > >>>>>>>> > >>>>>>>> After suspend/resume with this patch. > >>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>> PortTPowerOnTime=3100us > >>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>> > >>>>>>>> > >>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> > >>>>>>> > >>>>>>> Forgot to add mine: > >>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > >>>>>>> > >>>>>>>> > >>>>>>>> Best regards, > >>>>>>>> Ben Chuang > >>>>>>>> > >>>>>>>> > >>>>>>>>> --- > >>>>>>>>> Hi, > >>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > >>>>>>>>> on your laptop (Dell XPS 13) one last time? > >>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch > >>>>>>>>> could be due to a buggy old version BIOS in the laptop. > >>>>>>>>> > >>>>>>>>> Thanks, > >>>>>>>>> Vidya Sagar > >>>>>>>>> > >>>>>>>>> drivers/pci/pci.c | 7 +++++++ > >>>>>>>>> drivers/pci/pci.h | 4 ++++ > >>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > >>>>>>>>> 3 files changed, 55 insertions(+) > >>>>>>>>> > >>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > >>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 > >>>>>>>>> --- a/drivers/pci/pci.c > >>>>>>>>> +++ b/drivers/pci/pci.c > >>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > >>>>>>>>> return i; > >>>>>>>>> > >>>>>>>>> pci_save_ltr_state(dev); > >>>>>>>>> + pci_save_aspm_l1ss_state(dev); > >>>>>>>>> pci_save_dpc_state(dev); > >>>>>>>>> pci_save_aer_state(dev); > >>>>>>>>> pci_save_ptm_state(dev); > >>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > >>>>>>>>> * LTR itself (in the PCIe capability). > >>>>>>>>> */ > >>>>>>>>> pci_restore_ltr_state(dev); > >>>>>>>>> + pci_restore_aspm_l1ss_state(dev); > >>>>>>>>> > >>>>>>>>> pci_restore_pcie_state(dev); > >>>>>>>>> pci_restore_pasid_state(dev); > >>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > >>>>>>>>> if (error) > >>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > >>>>>>>>> > >>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > >>>>>>>>> + 2 * sizeof(u32)); > >>>>>>>>> + if (error) > >>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > >>>>>>>>> + > >>>>>>>>> pci_allocate_vc_save_buffers(dev); > >>>>>>>>> } > >>>>>>>>> > >>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > >>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 > >>>>>>>>> --- a/drivers/pci/pci.h > >>>>>>>>> +++ b/drivers/pci/pci.h > >>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > >>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); > >>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); > >>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > >>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>> #else > >>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > >>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > >>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > >>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > >>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>> #endif > >>>>>>>>> > >>>>>>>>> #ifdef CONFIG_PCIE_ECRC > >>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > >>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 > >>>>>>>>> --- a/drivers/pci/pcie/aspm.c > >>>>>>>>> +++ b/drivers/pci/pcie/aspm.c > >>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > >>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); > >>>>>>>>> } > >>>>>>>>> > >>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>> +{ > >>>>>>>>> + int aspm_l1ss; > >>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>> + u32 *cap; > >>>>>>>>> + > >>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>> + return; > >>>>>>>>> + > >>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>> + return; > >>>>>>>>> + > >>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>> + if (!save_state) > >>>>>>>>> + return; > >>>>>>>>> + > >>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > >>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > >>>>>>>>> +} > >>>>>>>>> + > >>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>> +{ > >>>>>>>>> + int aspm_l1ss; > >>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>> + u32 *cap; > >>>>>>>>> + > >>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>> + return; > >>>>>>>>> + > >>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>> + return; > >>>>>>>>> + > >>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>> + if (!save_state) > >>>>>>>>> + return; > >>>>>>>>> + > >>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > >>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > >>>>>>>>> +} > >>>>>>>>> + > >>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > >>>>>>>>> { > >>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > >>>>>>>>> -- > >>>>>>>>> 2.17.1 > >>>>>>>>> > >>>>>> > >>>>>> Hi, > >>>>>> > >>>>>> With this patch (and also mentioned > >>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > >>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after > >>>>>> suspend/resume with my WiFi card - it looks like whole communication > >>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > >>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > >>>>>> > >>>>>> I played a little bit with this code and it looks like the > >>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > >>>>>> why, not a PCI expert). > >>>>> > >>>>> Thanks a lot for testing this! I'm not quite sure what to make of the > >>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what > >>>>> other changes are in chromeos-5.10. > >>> > >>> Lukasz: I assume you are running this on Atlas and are seeing this bug > >>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer > >>> Intel platform that have the latest upstream kernel running already > >>> and see if this can be reproduced there too? > >>> Note that the wifi PCI device is different on newer Intel platforms, > >>> but platform design is similar enough that I suspect we should see > >>> similar bug on those too. The other option is to try the latest > >>> ustream kernel on Atlas. Perhaps if we just care about wifi (and > >>> ignore bringing up the graphics stack and GUI), it may come up > >>> sufficiently enough to try this patch? > >>> > >>> Thanks, > >>> > >>> Rajat > >>> > >>> > >>>>> > >>>>> Random observations, no analysis below. This from your dmesg > >>>>> certainly looks like PCI reads failing and returning ~0: > >>>>> > >>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > >>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > >>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal > >>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > >>>>> > >>>>> And then we re-enumerate 01:00.0 and it looks like it may have been > >>>>> reset (BAR is 0): > >>>>> > >>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > >>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > >>>>> > >>>>> lspci diffs from before/after suspend: > >>>>> > >>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > >>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > >>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > >>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > >>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > >>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > >>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > >>>>> - Capabilities: [150 v0] Null > >>>>> - Capabilities: [200 v1] L1 PM Substates > >>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > >>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns > >>>>> - L1SubCtl2: T_PwrOn=60us > >>>>> > >>>>> The DevSta differences might be BIOS bugs, probably not relevant. > >>>>> Interesting that ASPM is disabled, maybe didn't get enabled after > >>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability > >>>>> disappeared. > >>>>> > >>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > >>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > >>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > >>>>> Capabilities: [154 v1] L1 PM Substates > >>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > >>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns > >>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>> > >>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > >>>>> get reinitialized after re-enumeration? Looks like we didn't restore > >>>>> L1SubCtl1. > >>>>> > >>>>> Bjorn > >>>>> > >> > >> Hi, > >> > >> Thank you all for the response and input! As Rajat mentioned I'm using > >> chromebook - but not Atlas (Amberlake) - in this case it is Babymega > >> (Apollolake) - I will try to load most recent kernel and give it a > >> try once again. > >> > >> Best regards, > >> Lukasz > > > > Hi, > > > > I have applied this patch on top of v5.19-rc7 (chromeos) and I'm > > still getting same results: > > https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 > > > > Best regards, > > Lukasz > > Hi Vidya, Sorry for the long delay, I have retested your patch on top of linux-next/master (next-20220802) - the results for my device remain the same. Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef Let me know if you need any more logs and/or tests. Best regards, Lukasz
Thanks Lukasz for the logs. I still that the L1SS capability in the root port (00:14.0) disappeared after resume. I still don't understand how this patch can make the capability register itself disappear. Honestly, I still see this as a HW issue. Bjorn, could you please throw some light on this? Thanks, Vidya Sagar On 8/3/2022 5:34 PM, Lukasz Majczak wrote: > External email: Use caution opening links or attachments > > > pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): >> >> Hi Lukasz, >> Thanks for sharing your observations. >> >> Could you please also share the output of 'sudo lspci -vvvv' before and >> after suspend-resume cycle with the latest linux-next? >> Do we still see the L1SS capabilities getting disappeared post resume? >> >> Thanks, >> Vidya Sagar >> >> On 7/29/2022 3:09 PM, Lukasz Majczak wrote: >>> External email: Use caution opening links or attachments >>> >>> >>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): >>>> >>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): >>>>> >>>>> Hello, >>>>> >>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>> >>>>>> Agree with Bjorn's observations. >>>>>> The fact that the L1SS capability registers themselves disappeared in >>>>>> the root port post resume indicates that there seems to be something >>>>>> wrong with the BIOS itself. >>>>>> Could you please check from that perspective? >>>>> >>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This >>>>> is a shallower sleep state that preserves more state than, for e.g. S3 >>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture >>>>> at all. i.e. after the kernel runs its suspend routines, it just puts >>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to >>>>> this. >>>>> >>>>> >>>>>> >>>>>> Thanks, >>>>>> Vidya Sagar >>>>>> >>>>>> >>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: >>>>>>> External email: Use caution opening links or attachments >>>>>>> >>>>>>> >>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: >>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): >>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: >>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>>>>>>> >>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't >>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates >>>>>>>>>>> configuration being lost post-resume. >>>>>>>>>>> >>>>>>>>>>> Save the L1 Substates control registers so that the configuration is >>>>>>>>>>> retained post-resume. >>>>>>>>>>> >>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> >>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> >>>>>>>>>> >>>>>>>>>> Hi Vidya, >>>>>>>>>> >>>>>>>>>> I tested this patch on kernel v5.19-rc6. >>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. >>>>>>>>>> This patch can restore L1SS after suspend/resume. >>>>>>>>>> >>>>>>>>>> The test results are as follows: >>>>>>>>>> >>>>>>>>>> After Boot: >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> After suspend/resume without this patch. >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>>>>> L1SubCtl2: T_PwrOn=10us >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> After suspend/resume with this patch. >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> >>>>>>>>> >>>>>>>>> Forgot to add mine: >>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> Best regards, >>>>>>>>>> Ben Chuang >>>>>>>>>> >>>>>>>>>> >>>>>>>>>>> --- >>>>>>>>>>> Hi, >>>>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch >>>>>>>>>>> on your laptop (Dell XPS 13) one last time? >>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch >>>>>>>>>>> could be due to a buggy old version BIOS in the laptop. >>>>>>>>>>> >>>>>>>>>>> Thanks, >>>>>>>>>>> Vidya Sagar >>>>>>>>>>> >>>>>>>>>>> drivers/pci/pci.c | 7 +++++++ >>>>>>>>>>> drivers/pci/pci.h | 4 ++++ >>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ >>>>>>>>>>> 3 files changed, 55 insertions(+) >>>>>>>>>>> >>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c >>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 >>>>>>>>>>> --- a/drivers/pci/pci.c >>>>>>>>>>> +++ b/drivers/pci/pci.c >>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) >>>>>>>>>>> return i; >>>>>>>>>>> >>>>>>>>>>> pci_save_ltr_state(dev); >>>>>>>>>>> + pci_save_aspm_l1ss_state(dev); >>>>>>>>>>> pci_save_dpc_state(dev); >>>>>>>>>>> pci_save_aer_state(dev); >>>>>>>>>>> pci_save_ptm_state(dev); >>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) >>>>>>>>>>> * LTR itself (in the PCIe capability). >>>>>>>>>>> */ >>>>>>>>>>> pci_restore_ltr_state(dev); >>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev); >>>>>>>>>>> >>>>>>>>>>> pci_restore_pcie_state(dev); >>>>>>>>>>> pci_restore_pasid_state(dev); >>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) >>>>>>>>>>> if (error) >>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); >>>>>>>>>>> >>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, >>>>>>>>>>> + 2 * sizeof(u32)); >>>>>>>>>>> + if (error) >>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); >>>>>>>>>>> + >>>>>>>>>>> pci_allocate_vc_save_buffers(dev); >>>>>>>>>>> } >>>>>>>>>>> >>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h >>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 >>>>>>>>>>> --- a/drivers/pci/pci.h >>>>>>>>>>> +++ b/drivers/pci/pci.h >>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); >>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); >>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); >>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); >>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>>>> #else >>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } >>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } >>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } >>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } >>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>>>> #endif >>>>>>>>>>> >>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC >>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c >>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 >>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c >>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c >>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) >>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); >>>>>>>>>>> } >>>>>>>>>>> >>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>>>> +{ >>>>>>>>>>> + int aspm_l1ss; >>>>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>>>> + u32 *cap; >>>>>>>>>>> + >>>>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>>>> + return; >>>>>>>>>>> + >>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>> + if (!aspm_l1ss) >>>>>>>>>>> + return; >>>>>>>>>>> + >>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>> + if (!save_state) >>>>>>>>>>> + return; >>>>>>>>>>> + >>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); >>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); >>>>>>>>>>> +} >>>>>>>>>>> + >>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>>>> +{ >>>>>>>>>>> + int aspm_l1ss; >>>>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>>>> + u32 *cap; >>>>>>>>>>> + >>>>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>>>> + return; >>>>>>>>>>> + >>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>> + if (!aspm_l1ss) >>>>>>>>>>> + return; >>>>>>>>>>> + >>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>> + if (!save_state) >>>>>>>>>>> + return; >>>>>>>>>>> + >>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); >>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); >>>>>>>>>>> +} >>>>>>>>>>> + >>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) >>>>>>>>>>> { >>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, >>>>>>>>>>> -- >>>>>>>>>>> 2.17.1 >>>>>>>>>>> >>>>>>>> >>>>>>>> Hi, >>>>>>>> >>>>>>>> With this patch (and also mentioned >>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) >>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after >>>>>>>> suspend/resume with my WiFi card - it looks like whole communication >>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume >>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 >>>>>>>> >>>>>>>> I played a little bit with this code and it looks like the >>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know >>>>>>>> why, not a PCI expert). >>>>>>> >>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the >>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what >>>>>>> other changes are in chromeos-5.10. >>>>> >>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug >>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer >>>>> Intel platform that have the latest upstream kernel running already >>>>> and see if this can be reproduced there too? >>>>> Note that the wifi PCI device is different on newer Intel platforms, >>>>> but platform design is similar enough that I suspect we should see >>>>> similar bug on those too. The other option is to try the latest >>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and >>>>> ignore bringing up the graphics stack and GUI), it may come up >>>>> sufficiently enough to try this patch? >>>>> >>>>> Thanks, >>>>> >>>>> Rajat >>>>> >>>>> >>>>>>> >>>>>>> Random observations, no analysis below. This from your dmesg >>>>>>> certainly looks like PCI reads failing and returning ~0: >>>>>>> >>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) >>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff >>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal >>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. >>>>>>> >>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been >>>>>>> reset (BAR is 0): >>>>>>> >>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 >>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] >>>>>>> >>>>>>> lspci diffs from before/after suspend: >>>>>>> >>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) >>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 >>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- >>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- >>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- >>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- >>>>>>> - Capabilities: [150 v0] Null >>>>>>> - Capabilities: [200 v1] L1 PM Substates >>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us >>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns >>>>>>> - L1SubCtl2: T_PwrOn=60us >>>>>>> >>>>>>> The DevSta differences might be BIOS bugs, probably not relevant. >>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after >>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability >>>>>>> disappeared. >>>>>>> >>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) >>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- >>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- >>>>>>> Capabilities: [154 v1] L1 PM Substates >>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us >>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns >>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>> >>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't >>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore >>>>>>> L1SubCtl1. >>>>>>> >>>>>>> Bjorn >>>>>>> >>>> >>>> Hi, >>>> >>>> Thank you all for the response and input! As Rajat mentioned I'm using >>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega >>>> (Apollolake) - I will try to load most recent kernel and give it a >>>> try once again. >>>> >>>> Best regards, >>>> Lukasz >>> >>> Hi, >>> >>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm >>> still getting same results: >>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 >>> >>> Best regards, >>> Lukasz >>> > Hi Vidya, > > Sorry for the long delay, I have retested your patch on top of > linux-next/master (next-20220802) - the results for my device remain > the same. > Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) > https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef > Let me know if you need any more logs and/or tests. > > Best regards, > Lukasz >
śr., 3 sie 2022 o 14:55 Vidya Sagar <vidyas@nvidia.com> napisał(a): > > Thanks Lukasz for the logs. > I still that the L1SS capability in the root port (00:14.0) disappeared > after resume. > I still don't understand how this patch can make the capability register > itself disappear. Honestly, I still see this as a HW issue. > Bjorn, could you please throw some light on this? > > Thanks, > Vidya Sagar > > On 8/3/2022 5:34 PM, Lukasz Majczak wrote: > > External email: Use caution opening links or attachments > > > > > > pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): > >> > >> Hi Lukasz, > >> Thanks for sharing your observations. > >> > >> Could you please also share the output of 'sudo lspci -vvvv' before and > >> after suspend-resume cycle with the latest linux-next? > >> Do we still see the L1SS capabilities getting disappeared post resume? > >> > >> Thanks, > >> Vidya Sagar > >> > >> On 7/29/2022 3:09 PM, Lukasz Majczak wrote: > >>> External email: Use caution opening links or attachments > >>> > >>> > >>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): > >>>> > >>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): > >>>>> > >>>>> Hello, > >>>>> > >>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>> > >>>>>> Agree with Bjorn's observations. > >>>>>> The fact that the L1SS capability registers themselves disappeared in > >>>>>> the root port post resume indicates that there seems to be something > >>>>>> wrong with the BIOS itself. > >>>>>> Could you please check from that perspective? > >>>>> > >>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This > >>>>> is a shallower sleep state that preserves more state than, for e.g. S3 > >>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture > >>>>> at all. i.e. after the kernel runs its suspend routines, it just puts > >>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to > >>>>> this. > >>>>> > >>>>> > >>>>>> > >>>>>> Thanks, > >>>>>> Vidya Sagar > >>>>>> > >>>>>> > >>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > >>>>>>> External email: Use caution opening links or attachments > >>>>>>> > >>>>>>> > >>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > >>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > >>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > >>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>>>>>>> > >>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > >>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates > >>>>>>>>>>> configuration being lost post-resume. > >>>>>>>>>>> > >>>>>>>>>>> Save the L1 Substates control registers so that the configuration is > >>>>>>>>>>> retained post-resume. > >>>>>>>>>>> > >>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > >>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > >>>>>>>>>> > >>>>>>>>>> Hi Vidya, > >>>>>>>>>> > >>>>>>>>>> I tested this patch on kernel v5.19-rc6. > >>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. > >>>>>>>>>> This patch can restore L1SS after suspend/resume. > >>>>>>>>>> > >>>>>>>>>> The test results are as follows: > >>>>>>>>>> > >>>>>>>>>> After Boot: > >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> After suspend/resume without this patch. > >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>>>>> L1SubCtl2: T_PwrOn=10us > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> After suspend/resume with this patch. > >>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> > >>>>>>>>> > >>>>>>>>> Forgot to add mine: > >>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > >>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> Best regards, > >>>>>>>>>> Ben Chuang > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>>> --- > >>>>>>>>>>> Hi, > >>>>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > >>>>>>>>>>> on your laptop (Dell XPS 13) one last time? > >>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch > >>>>>>>>>>> could be due to a buggy old version BIOS in the laptop. > >>>>>>>>>>> > >>>>>>>>>>> Thanks, > >>>>>>>>>>> Vidya Sagar > >>>>>>>>>>> > >>>>>>>>>>> drivers/pci/pci.c | 7 +++++++ > >>>>>>>>>>> drivers/pci/pci.h | 4 ++++ > >>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > >>>>>>>>>>> 3 files changed, 55 insertions(+) > >>>>>>>>>>> > >>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > >>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 > >>>>>>>>>>> --- a/drivers/pci/pci.c > >>>>>>>>>>> +++ b/drivers/pci/pci.c > >>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > >>>>>>>>>>> return i; > >>>>>>>>>>> > >>>>>>>>>>> pci_save_ltr_state(dev); > >>>>>>>>>>> + pci_save_aspm_l1ss_state(dev); > >>>>>>>>>>> pci_save_dpc_state(dev); > >>>>>>>>>>> pci_save_aer_state(dev); > >>>>>>>>>>> pci_save_ptm_state(dev); > >>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > >>>>>>>>>>> * LTR itself (in the PCIe capability). > >>>>>>>>>>> */ > >>>>>>>>>>> pci_restore_ltr_state(dev); > >>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev); > >>>>>>>>>>> > >>>>>>>>>>> pci_restore_pcie_state(dev); > >>>>>>>>>>> pci_restore_pasid_state(dev); > >>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > >>>>>>>>>>> if (error) > >>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > >>>>>>>>>>> > >>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > >>>>>>>>>>> + 2 * sizeof(u32)); > >>>>>>>>>>> + if (error) > >>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > >>>>>>>>>>> + > >>>>>>>>>>> pci_allocate_vc_save_buffers(dev); > >>>>>>>>>>> } > >>>>>>>>>>> > >>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > >>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 > >>>>>>>>>>> --- a/drivers/pci/pci.h > >>>>>>>>>>> +++ b/drivers/pci/pci.h > >>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > >>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); > >>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); > >>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > >>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>>>> #else > >>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > >>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > >>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > >>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > >>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>>>> #endif > >>>>>>>>>>> > >>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC > >>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > >>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 > >>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c > >>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c > >>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > >>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); > >>>>>>>>>>> } > >>>>>>>>>>> > >>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>>>> +{ > >>>>>>>>>>> + int aspm_l1ss; > >>>>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>>>> + u32 *cap; > >>>>>>>>>>> + > >>>>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>>>> + return; > >>>>>>>>>>> + > >>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>>>> + return; > >>>>>>>>>>> + > >>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>> + if (!save_state) > >>>>>>>>>>> + return; > >>>>>>>>>>> + > >>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > >>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > >>>>>>>>>>> +} > >>>>>>>>>>> + > >>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>>>> +{ > >>>>>>>>>>> + int aspm_l1ss; > >>>>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>>>> + u32 *cap; > >>>>>>>>>>> + > >>>>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>>>> + return; > >>>>>>>>>>> + > >>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>>>> + return; > >>>>>>>>>>> + > >>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>> + if (!save_state) > >>>>>>>>>>> + return; > >>>>>>>>>>> + > >>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > >>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > >>>>>>>>>>> +} > >>>>>>>>>>> + > >>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > >>>>>>>>>>> { > >>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > >>>>>>>>>>> -- > >>>>>>>>>>> 2.17.1 > >>>>>>>>>>> > >>>>>>>> > >>>>>>>> Hi, > >>>>>>>> > >>>>>>>> With this patch (and also mentioned > >>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > >>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after > >>>>>>>> suspend/resume with my WiFi card - it looks like whole communication > >>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > >>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > >>>>>>>> > >>>>>>>> I played a little bit with this code and it looks like the > >>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > >>>>>>>> why, not a PCI expert). > >>>>>>> > >>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the > >>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what > >>>>>>> other changes are in chromeos-5.10. > >>>>> > >>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug > >>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer > >>>>> Intel platform that have the latest upstream kernel running already > >>>>> and see if this can be reproduced there too? > >>>>> Note that the wifi PCI device is different on newer Intel platforms, > >>>>> but platform design is similar enough that I suspect we should see > >>>>> similar bug on those too. The other option is to try the latest > >>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and > >>>>> ignore bringing up the graphics stack and GUI), it may come up > >>>>> sufficiently enough to try this patch? > >>>>> > >>>>> Thanks, > >>>>> > >>>>> Rajat > >>>>> > >>>>> > >>>>>>> > >>>>>>> Random observations, no analysis below. This from your dmesg > >>>>>>> certainly looks like PCI reads failing and returning ~0: > >>>>>>> > >>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > >>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > >>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal > >>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > >>>>>>> > >>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been > >>>>>>> reset (BAR is 0): > >>>>>>> > >>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > >>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > >>>>>>> > >>>>>>> lspci diffs from before/after suspend: > >>>>>>> > >>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > >>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > >>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > >>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > >>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > >>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > >>>>>>> - Capabilities: [150 v0] Null > >>>>>>> - Capabilities: [200 v1] L1 PM Substates > >>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > >>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns > >>>>>>> - L1SubCtl2: T_PwrOn=60us > >>>>>>> > >>>>>>> The DevSta differences might be BIOS bugs, probably not relevant. > >>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after > >>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability > >>>>>>> disappeared. > >>>>>>> > >>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > >>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > >>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > >>>>>>> Capabilities: [154 v1] L1 PM Substates > >>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > >>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns > >>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>> > >>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > >>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore > >>>>>>> L1SubCtl1. > >>>>>>> > >>>>>>> Bjorn > >>>>>>> > >>>> > >>>> Hi, > >>>> > >>>> Thank you all for the response and input! As Rajat mentioned I'm using > >>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega > >>>> (Apollolake) - I will try to load most recent kernel and give it a > >>>> try once again. > >>>> > >>>> Best regards, > >>>> Lukasz > >>> > >>> Hi, > >>> > >>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm > >>> still getting same results: > >>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 > >>> > >>> Best regards, > >>> Lukasz > >>> > > Hi Vidya, > > > > Sorry for the long delay, I have retested your patch on top of > > linux-next/master (next-20220802) - the results for my device remain > > the same. > > Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) > > https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef > > Let me know if you need any more logs and/or tests. > > > > Best regards, > > Lukasz > > Hi Vidya, After your last email, I've re-tested my setup and (without your patch) the capability register also disappears - so it looks there is - in fact - some problem in my setup and your patch just brings it to the top as after resume tries to write to a register that is no longer present. I'm very sorry for the confusion here and I've not notice that at the very beginning. Best regards, Lukasz
Thanks Lukasz for the update. I think confirms that there is no issue with the patch as such. Bjorn, could you please define the next step for this patch? Thanks, Vidya Sagar On 8/8/2022 7:37 PM, Lukasz Majczak wrote: > External email: Use caution opening links or attachments > > > śr., 3 sie 2022 o 14:55 Vidya Sagar <vidyas@nvidia.com> napisał(a): >> >> Thanks Lukasz for the logs. >> I still that the L1SS capability in the root port (00:14.0) disappeared >> after resume. >> I still don't understand how this patch can make the capability register >> itself disappear. Honestly, I still see this as a HW issue. >> Bjorn, could you please throw some light on this? >> >> Thanks, >> Vidya Sagar >> >> On 8/3/2022 5:34 PM, Lukasz Majczak wrote: >>> External email: Use caution opening links or attachments >>> >>> >>> pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): >>>> >>>> Hi Lukasz, >>>> Thanks for sharing your observations. >>>> >>>> Could you please also share the output of 'sudo lspci -vvvv' before and >>>> after suspend-resume cycle with the latest linux-next? >>>> Do we still see the L1SS capabilities getting disappeared post resume? >>>> >>>> Thanks, >>>> Vidya Sagar >>>> >>>> On 7/29/2022 3:09 PM, Lukasz Majczak wrote: >>>>> External email: Use caution opening links or attachments >>>>> >>>>> >>>>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): >>>>>> >>>>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): >>>>>>> >>>>>>> Hello, >>>>>>> >>>>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>>>> >>>>>>>> Agree with Bjorn's observations. >>>>>>>> The fact that the L1SS capability registers themselves disappeared in >>>>>>>> the root port post resume indicates that there seems to be something >>>>>>>> wrong with the BIOS itself. >>>>>>>> Could you please check from that perspective? >>>>>>> >>>>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This >>>>>>> is a shallower sleep state that preserves more state than, for e.g. S3 >>>>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture >>>>>>> at all. i.e. after the kernel runs its suspend routines, it just puts >>>>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to >>>>>>> this. >>>>>>> >>>>>>> >>>>>>>> >>>>>>>> Thanks, >>>>>>>> Vidya Sagar >>>>>>>> >>>>>>>> >>>>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: >>>>>>>>> External email: Use caution opening links or attachments >>>>>>>>> >>>>>>>>> >>>>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: >>>>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): >>>>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: >>>>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't >>>>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates >>>>>>>>>>>>> configuration being lost post-resume. >>>>>>>>>>>>> >>>>>>>>>>>>> Save the L1 Substates control registers so that the configuration is >>>>>>>>>>>>> retained post-resume. >>>>>>>>>>>>> >>>>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> >>>>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> >>>>>>>>>>>> >>>>>>>>>>>> Hi Vidya, >>>>>>>>>>>> >>>>>>>>>>>> I tested this patch on kernel v5.19-rc6. >>>>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. >>>>>>>>>>>> This patch can restore L1SS after suspend/resume. >>>>>>>>>>>> >>>>>>>>>>>> The test results are as follows: >>>>>>>>>>>> >>>>>>>>>>>> After Boot: >>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> After suspend/resume without this patch. >>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>>>>>>> L1SubCtl2: T_PwrOn=10us >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> After suspend/resume with this patch. >>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> >>>>>>>>>>> >>>>>>>>>>> Forgot to add mine: >>>>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> >>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Best regards, >>>>>>>>>>>> Ben Chuang >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>>> --- >>>>>>>>>>>>> Hi, >>>>>>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch >>>>>>>>>>>>> on your laptop (Dell XPS 13) one last time? >>>>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch >>>>>>>>>>>>> could be due to a buggy old version BIOS in the laptop. >>>>>>>>>>>>> >>>>>>>>>>>>> Thanks, >>>>>>>>>>>>> Vidya Sagar >>>>>>>>>>>>> >>>>>>>>>>>>> drivers/pci/pci.c | 7 +++++++ >>>>>>>>>>>>> drivers/pci/pci.h | 4 ++++ >>>>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ >>>>>>>>>>>>> 3 files changed, 55 insertions(+) >>>>>>>>>>>>> >>>>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c >>>>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 >>>>>>>>>>>>> --- a/drivers/pci/pci.c >>>>>>>>>>>>> +++ b/drivers/pci/pci.c >>>>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) >>>>>>>>>>>>> return i; >>>>>>>>>>>>> >>>>>>>>>>>>> pci_save_ltr_state(dev); >>>>>>>>>>>>> + pci_save_aspm_l1ss_state(dev); >>>>>>>>>>>>> pci_save_dpc_state(dev); >>>>>>>>>>>>> pci_save_aer_state(dev); >>>>>>>>>>>>> pci_save_ptm_state(dev); >>>>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) >>>>>>>>>>>>> * LTR itself (in the PCIe capability). >>>>>>>>>>>>> */ >>>>>>>>>>>>> pci_restore_ltr_state(dev); >>>>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev); >>>>>>>>>>>>> >>>>>>>>>>>>> pci_restore_pcie_state(dev); >>>>>>>>>>>>> pci_restore_pasid_state(dev); >>>>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) >>>>>>>>>>>>> if (error) >>>>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); >>>>>>>>>>>>> >>>>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, >>>>>>>>>>>>> + 2 * sizeof(u32)); >>>>>>>>>>>>> + if (error) >>>>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); >>>>>>>>>>>>> + >>>>>>>>>>>>> pci_allocate_vc_save_buffers(dev); >>>>>>>>>>>>> } >>>>>>>>>>>>> >>>>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h >>>>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 >>>>>>>>>>>>> --- a/drivers/pci/pci.h >>>>>>>>>>>>> +++ b/drivers/pci/pci.h >>>>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); >>>>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); >>>>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); >>>>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); >>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>>>>>> #else >>>>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } >>>>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } >>>>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } >>>>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } >>>>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>>>>>> #endif >>>>>>>>>>>>> >>>>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC >>>>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c >>>>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 >>>>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c >>>>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c >>>>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) >>>>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); >>>>>>>>>>>>> } >>>>>>>>>>>>> >>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>>>>>> +{ >>>>>>>>>>>>> + int aspm_l1ss; >>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>>>>>> + u32 *cap; >>>>>>>>>>>>> + >>>>>>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>>>>>> + return; >>>>>>>>>>>>> + >>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>> + if (!aspm_l1ss) >>>>>>>>>>>>> + return; >>>>>>>>>>>>> + >>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>> + if (!save_state) >>>>>>>>>>>>> + return; >>>>>>>>>>>>> + >>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); >>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); >>>>>>>>>>>>> +} >>>>>>>>>>>>> + >>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>>>>>> +{ >>>>>>>>>>>>> + int aspm_l1ss; >>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>>>>>> + u32 *cap; >>>>>>>>>>>>> + >>>>>>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>>>>>> + return; >>>>>>>>>>>>> + >>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>> + if (!aspm_l1ss) >>>>>>>>>>>>> + return; >>>>>>>>>>>>> + >>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>> + if (!save_state) >>>>>>>>>>>>> + return; >>>>>>>>>>>>> + >>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); >>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); >>>>>>>>>>>>> +} >>>>>>>>>>>>> + >>>>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) >>>>>>>>>>>>> { >>>>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, >>>>>>>>>>>>> -- >>>>>>>>>>>>> 2.17.1 >>>>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Hi, >>>>>>>>>> >>>>>>>>>> With this patch (and also mentioned >>>>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) >>>>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after >>>>>>>>>> suspend/resume with my WiFi card - it looks like whole communication >>>>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume >>>>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 >>>>>>>>>> >>>>>>>>>> I played a little bit with this code and it looks like the >>>>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know >>>>>>>>>> why, not a PCI expert). >>>>>>>>> >>>>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the >>>>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what >>>>>>>>> other changes are in chromeos-5.10. >>>>>>> >>>>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug >>>>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer >>>>>>> Intel platform that have the latest upstream kernel running already >>>>>>> and see if this can be reproduced there too? >>>>>>> Note that the wifi PCI device is different on newer Intel platforms, >>>>>>> but platform design is similar enough that I suspect we should see >>>>>>> similar bug on those too. The other option is to try the latest >>>>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and >>>>>>> ignore bringing up the graphics stack and GUI), it may come up >>>>>>> sufficiently enough to try this patch? >>>>>>> >>>>>>> Thanks, >>>>>>> >>>>>>> Rajat >>>>>>> >>>>>>> >>>>>>>>> >>>>>>>>> Random observations, no analysis below. This from your dmesg >>>>>>>>> certainly looks like PCI reads failing and returning ~0: >>>>>>>>> >>>>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) >>>>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff >>>>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal >>>>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. >>>>>>>>> >>>>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been >>>>>>>>> reset (BAR is 0): >>>>>>>>> >>>>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 >>>>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] >>>>>>>>> >>>>>>>>> lspci diffs from before/after suspend: >>>>>>>>> >>>>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) >>>>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 >>>>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- >>>>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- >>>>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- >>>>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- >>>>>>>>> - Capabilities: [150 v0] Null >>>>>>>>> - Capabilities: [200 v1] L1 PM Substates >>>>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us >>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns >>>>>>>>> - L1SubCtl2: T_PwrOn=60us >>>>>>>>> >>>>>>>>> The DevSta differences might be BIOS bugs, probably not relevant. >>>>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after >>>>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability >>>>>>>>> disappeared. >>>>>>>>> >>>>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) >>>>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- >>>>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- >>>>>>>>> Capabilities: [154 v1] L1 PM Substates >>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us >>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns >>>>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>>>> >>>>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't >>>>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore >>>>>>>>> L1SubCtl1. >>>>>>>>> >>>>>>>>> Bjorn >>>>>>>>> >>>>>> >>>>>> Hi, >>>>>> >>>>>> Thank you all for the response and input! As Rajat mentioned I'm using >>>>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega >>>>>> (Apollolake) - I will try to load most recent kernel and give it a >>>>>> try once again. >>>>>> >>>>>> Best regards, >>>>>> Lukasz >>>>> >>>>> Hi, >>>>> >>>>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm >>>>> still getting same results: >>>>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 >>>>> >>>>> Best regards, >>>>> Lukasz >>>>> >>> Hi Vidya, >>> >>> Sorry for the long delay, I have retested your patch on top of >>> linux-next/master (next-20220802) - the results for my device remain >>> the same. >>> Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) >>> https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef >>> Let me know if you need any more logs and/or tests. >>> >>> Best regards, >>> Lukasz >>> > Hi Vidya, > > After your last email, I've re-tested my setup and (without your > patch) the capability register also disappears - so it looks there is > - in fact - some problem in my setup and your patch just brings it to > the top as after resume tries to write to a register that is no longer > present. I'm very sorry for the confusion here and I've not notice > that at the very beginning. > > Best regards, > Lukasz >
Hi Vidya, On Tue, Aug 9, 2022 at 12:17 AM Vidya Sagar <vidyas@nvidia.com> wrote: > > Thanks Lukasz for the update. > I think confirms that there is no issue with the patch as such. > Bjorn, could you please define the next step for this patch? I think the L1SS cap went away _after_ L1SS registers are restored, since your patch already check the cap before doing any write: + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); + if (!aspm_l1ss) + return; That means it's more likely to be caused by the following change: + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); So is it possible to clear PCI_L1SS_CTL1 before setting PCI_L1SS_CTL2, like what aspm_calc_l1ss_info() does? Kai-Heng > > Thanks, > Vidya Sagar > > On 8/8/2022 7:37 PM, Lukasz Majczak wrote: > > External email: Use caution opening links or attachments > > > > > > śr., 3 sie 2022 o 14:55 Vidya Sagar <vidyas@nvidia.com> napisał(a): > >> > >> Thanks Lukasz for the logs. > >> I still that the L1SS capability in the root port (00:14.0) disappeared > >> after resume. > >> I still don't understand how this patch can make the capability register > >> itself disappear. Honestly, I still see this as a HW issue. > >> Bjorn, could you please throw some light on this? > >> > >> Thanks, > >> Vidya Sagar > >> > >> On 8/3/2022 5:34 PM, Lukasz Majczak wrote: > >>> External email: Use caution opening links or attachments > >>> > >>> > >>> pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): > >>>> > >>>> Hi Lukasz, > >>>> Thanks for sharing your observations. > >>>> > >>>> Could you please also share the output of 'sudo lspci -vvvv' before and > >>>> after suspend-resume cycle with the latest linux-next? > >>>> Do we still see the L1SS capabilities getting disappeared post resume? > >>>> > >>>> Thanks, > >>>> Vidya Sagar > >>>> > >>>> On 7/29/2022 3:09 PM, Lukasz Majczak wrote: > >>>>> External email: Use caution opening links or attachments > >>>>> > >>>>> > >>>>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): > >>>>>> > >>>>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): > >>>>>>> > >>>>>>> Hello, > >>>>>>> > >>>>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>>>> > >>>>>>>> Agree with Bjorn's observations. > >>>>>>>> The fact that the L1SS capability registers themselves disappeared in > >>>>>>>> the root port post resume indicates that there seems to be something > >>>>>>>> wrong with the BIOS itself. > >>>>>>>> Could you please check from that perspective? > >>>>>>> > >>>>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This > >>>>>>> is a shallower sleep state that preserves more state than, for e.g. S3 > >>>>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture > >>>>>>> at all. i.e. after the kernel runs its suspend routines, it just puts > >>>>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to > >>>>>>> this. > >>>>>>> > >>>>>>> > >>>>>>>> > >>>>>>>> Thanks, > >>>>>>>> Vidya Sagar > >>>>>>>> > >>>>>>>> > >>>>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > >>>>>>>>> External email: Use caution opening links or attachments > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > >>>>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > >>>>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > >>>>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>>>>>>>>> > >>>>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > >>>>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates > >>>>>>>>>>>>> configuration being lost post-resume. > >>>>>>>>>>>>> > >>>>>>>>>>>>> Save the L1 Substates control registers so that the configuration is > >>>>>>>>>>>>> retained post-resume. > >>>>>>>>>>>>> > >>>>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > >>>>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > >>>>>>>>>>>> > >>>>>>>>>>>> Hi Vidya, > >>>>>>>>>>>> > >>>>>>>>>>>> I tested this patch on kernel v5.19-rc6. > >>>>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. > >>>>>>>>>>>> This patch can restore L1SS after suspend/resume. > >>>>>>>>>>>> > >>>>>>>>>>>> The test results are as follows: > >>>>>>>>>>>> > >>>>>>>>>>>> After Boot: > >>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> After suspend/resume without this patch. > >>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>>>>>>> L1SubCtl2: T_PwrOn=10us > >>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> After suspend/resume with this patch. > >>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> > >>>>>>>>>>> > >>>>>>>>>>> Forgot to add mine: > >>>>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > >>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> Best regards, > >>>>>>>>>>>> Ben Chuang > >>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>>> --- > >>>>>>>>>>>>> Hi, > >>>>>>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > >>>>>>>>>>>>> on your laptop (Dell XPS 13) one last time? > >>>>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch > >>>>>>>>>>>>> could be due to a buggy old version BIOS in the laptop. > >>>>>>>>>>>>> > >>>>>>>>>>>>> Thanks, > >>>>>>>>>>>>> Vidya Sagar > >>>>>>>>>>>>> > >>>>>>>>>>>>> drivers/pci/pci.c | 7 +++++++ > >>>>>>>>>>>>> drivers/pci/pci.h | 4 ++++ > >>>>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > >>>>>>>>>>>>> 3 files changed, 55 insertions(+) > >>>>>>>>>>>>> > >>>>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > >>>>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 > >>>>>>>>>>>>> --- a/drivers/pci/pci.c > >>>>>>>>>>>>> +++ b/drivers/pci/pci.c > >>>>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > >>>>>>>>>>>>> return i; > >>>>>>>>>>>>> > >>>>>>>>>>>>> pci_save_ltr_state(dev); > >>>>>>>>>>>>> + pci_save_aspm_l1ss_state(dev); > >>>>>>>>>>>>> pci_save_dpc_state(dev); > >>>>>>>>>>>>> pci_save_aer_state(dev); > >>>>>>>>>>>>> pci_save_ptm_state(dev); > >>>>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > >>>>>>>>>>>>> * LTR itself (in the PCIe capability). > >>>>>>>>>>>>> */ > >>>>>>>>>>>>> pci_restore_ltr_state(dev); > >>>>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev); > >>>>>>>>>>>>> > >>>>>>>>>>>>> pci_restore_pcie_state(dev); > >>>>>>>>>>>>> pci_restore_pasid_state(dev); > >>>>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > >>>>>>>>>>>>> if (error) > >>>>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > >>>>>>>>>>>>> > >>>>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > >>>>>>>>>>>>> + 2 * sizeof(u32)); > >>>>>>>>>>>>> + if (error) > >>>>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > >>>>>>>>>>>>> + > >>>>>>>>>>>>> pci_allocate_vc_save_buffers(dev); > >>>>>>>>>>>>> } > >>>>>>>>>>>>> > >>>>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > >>>>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 > >>>>>>>>>>>>> --- a/drivers/pci/pci.h > >>>>>>>>>>>>> +++ b/drivers/pci/pci.h > >>>>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > >>>>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); > >>>>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); > >>>>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > >>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>>>>>> #else > >>>>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > >>>>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > >>>>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > >>>>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > >>>>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>>>>>> #endif > >>>>>>>>>>>>> > >>>>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC > >>>>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 > >>>>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > >>>>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); > >>>>>>>>>>>>> } > >>>>>>>>>>>>> > >>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>>>>>> +{ > >>>>>>>>>>>>> + int aspm_l1ss; > >>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>>>>>> + u32 *cap; > >>>>>>>>>>>>> + > >>>>>>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>>>>>> + return; > >>>>>>>>>>>>> + > >>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>>>>>> + return; > >>>>>>>>>>>>> + > >>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>> + if (!save_state) > >>>>>>>>>>>>> + return; > >>>>>>>>>>>>> + > >>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > >>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > >>>>>>>>>>>>> +} > >>>>>>>>>>>>> + > >>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>>>>>> +{ > >>>>>>>>>>>>> + int aspm_l1ss; > >>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>>>>>> + u32 *cap; > >>>>>>>>>>>>> + > >>>>>>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>>>>>> + return; > >>>>>>>>>>>>> + > >>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>>>>>> + return; > >>>>>>>>>>>>> + > >>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>> + if (!save_state) > >>>>>>>>>>>>> + return; > >>>>>>>>>>>>> + > >>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > >>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > >>>>>>>>>>>>> +} > >>>>>>>>>>>>> + > >>>>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > >>>>>>>>>>>>> { > >>>>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > >>>>>>>>>>>>> -- > >>>>>>>>>>>>> 2.17.1 > >>>>>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> Hi, > >>>>>>>>>> > >>>>>>>>>> With this patch (and also mentioned > >>>>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > >>>>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after > >>>>>>>>>> suspend/resume with my WiFi card - it looks like whole communication > >>>>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > >>>>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > >>>>>>>>>> > >>>>>>>>>> I played a little bit with this code and it looks like the > >>>>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > >>>>>>>>>> why, not a PCI expert). > >>>>>>>>> > >>>>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the > >>>>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what > >>>>>>>>> other changes are in chromeos-5.10. > >>>>>>> > >>>>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug > >>>>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer > >>>>>>> Intel platform that have the latest upstream kernel running already > >>>>>>> and see if this can be reproduced there too? > >>>>>>> Note that the wifi PCI device is different on newer Intel platforms, > >>>>>>> but platform design is similar enough that I suspect we should see > >>>>>>> similar bug on those too. The other option is to try the latest > >>>>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and > >>>>>>> ignore bringing up the graphics stack and GUI), it may come up > >>>>>>> sufficiently enough to try this patch? > >>>>>>> > >>>>>>> Thanks, > >>>>>>> > >>>>>>> Rajat > >>>>>>> > >>>>>>> > >>>>>>>>> > >>>>>>>>> Random observations, no analysis below. This from your dmesg > >>>>>>>>> certainly looks like PCI reads failing and returning ~0: > >>>>>>>>> > >>>>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > >>>>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > >>>>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal > >>>>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > >>>>>>>>> > >>>>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been > >>>>>>>>> reset (BAR is 0): > >>>>>>>>> > >>>>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > >>>>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > >>>>>>>>> > >>>>>>>>> lspci diffs from before/after suspend: > >>>>>>>>> > >>>>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > >>>>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > >>>>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > >>>>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > >>>>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > >>>>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > >>>>>>>>> - Capabilities: [150 v0] Null > >>>>>>>>> - Capabilities: [200 v1] L1 PM Substates > >>>>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > >>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns > >>>>>>>>> - L1SubCtl2: T_PwrOn=60us > >>>>>>>>> > >>>>>>>>> The DevSta differences might be BIOS bugs, probably not relevant. > >>>>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after > >>>>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability > >>>>>>>>> disappeared. > >>>>>>>>> > >>>>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > >>>>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > >>>>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > >>>>>>>>> Capabilities: [154 v1] L1 PM Substates > >>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > >>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns > >>>>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>>>> > >>>>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > >>>>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore > >>>>>>>>> L1SubCtl1. > >>>>>>>>> > >>>>>>>>> Bjorn > >>>>>>>>> > >>>>>> > >>>>>> Hi, > >>>>>> > >>>>>> Thank you all for the response and input! As Rajat mentioned I'm using > >>>>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega > >>>>>> (Apollolake) - I will try to load most recent kernel and give it a > >>>>>> try once again. > >>>>>> > >>>>>> Best regards, > >>>>>> Lukasz > >>>>> > >>>>> Hi, > >>>>> > >>>>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm > >>>>> still getting same results: > >>>>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 > >>>>> > >>>>> Best regards, > >>>>> Lukasz > >>>>> > >>> Hi Vidya, > >>> > >>> Sorry for the long delay, I have retested your patch on top of > >>> linux-next/master (next-20220802) - the results for my device remain > >>> the same. > >>> Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) > >>> https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef > >>> Let me know if you need any more logs and/or tests. > >>> > >>> Best regards, > >>> Lukasz > >>> > > Hi Vidya, > > > > After your last email, I've re-tested my setup and (without your > > patch) the capability register also disappears - so it looks there is > > - in fact - some problem in my setup and your patch just brings it to > > the top as after resume tries to write to a register that is no longer > > present. I'm very sorry for the confusion here and I've not notice > > that at the very beginning. > > > > Best regards, > > Lukasz > >
On Tue, Aug 23, 2022 at 10:55:01PM +0800, Kai-Heng Feng wrote: > On Tue, Aug 9, 2022 at 12:17 AM Vidya Sagar <vidyas@nvidia.com> wrote: > > > > Thanks Lukasz for the update. > > I think confirms that there is no issue with the patch as such. > > Bjorn, could you please define the next step for this patch? > > I think the L1SS cap went away _after_ L1SS registers are restored, > since your patch already check the cap before doing any write: > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > + if (!aspm_l1ss) > + return; > > That means it's more likely to be caused by the following change: > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > So is it possible to clear PCI_L1SS_CTL1 before setting PCI_L1SS_CTL2, > like what aspm_calc_l1ss_info() does? Sorry, I've totally lost track of where we are with this. I guess the object is to save/restore L1SS state. And there are two problems that aren't understood yet? 1) Lukasz's 01:00.0 wifi device didn't work immediately after resume, but seemed to be hot-added later? [1] 2) The 00:14.0 Root Port L1SS capability was present before suspend/resume but not after? [2,3] I thought Lukasz's latest emails [4,5] indicated that problem 1) still happened and presumably only happens with Vidya's patch, and 2) also still happens, but happens even *without* Vidya's patch. Do I have that right? If adding the patch causes 1), obviously we would need to fix that. It would certainly be good to understand 2) as well, but I guess if that's a pre-existing problem, ... Bjorn [1] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-dmesg-L1762 [2] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-lspci-before-suspend-log-L136 [3] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-lspci-after-suspend-log-L136 [4] https://lore.kernel.org/r/CAFJ_xbr5NjoV1jC3P93N4UgooUuNdCRnrX7HuK=xLtPM5y7EjA@mail.gmail.com [5] https://lore.kernel.org/r/CAFJ_xboyQyEaDeQ+pZH_YqN52-ALGNqzmmzeyNt6X_Cz-c1w9Q@mail.gmail.com
On Fri, Aug 26, 2022 at 7:01 AM Bjorn Helgaas <helgaas@kernel.org> wrote: > > On Tue, Aug 23, 2022 at 10:55:01PM +0800, Kai-Heng Feng wrote: > > On Tue, Aug 9, 2022 at 12:17 AM Vidya Sagar <vidyas@nvidia.com> wrote: > > > > > > Thanks Lukasz for the update. > > > I think confirms that there is no issue with the patch as such. > > > Bjorn, could you please define the next step for this patch? > > > > I think the L1SS cap went away _after_ L1SS registers are restored, > > since your patch already check the cap before doing any write: > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!aspm_l1ss) > > + return; > > > > That means it's more likely to be caused by the following change: > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > > > So is it possible to clear PCI_L1SS_CTL1 before setting PCI_L1SS_CTL2, > > like what aspm_calc_l1ss_info() does? > > Sorry, I've totally lost track of where we are with this. I guess the > object is to save/restore L1SS state. > > And there are two problems that aren't understood yet? > > 1) Lukasz's 01:00.0 wifi device didn't work immediately after > resume, but seemed to be hot-added later? [1] > > 2) The 00:14.0 Root Port L1SS capability was present before > suspend/resume but not after? [2,3] > > I thought Lukasz's latest emails [4,5] indicated that problem 1) still > happened and presumably only happens with Vidya's patch, and 2) also > still happens, but happens even *without* Vidya's patch. Do I have > that right? Thanks, so root port already losing its L1SS cap before applying the patch. > > If adding the patch causes 1), obviously we would need to fix that. > It would certainly be good to understand 2) as well, but I guess if > that's a pre-existing problem, ... I wonder if checking parent device's L1SS cap in pci_restore_aspm_l1ss_state() a good workaround? If this is indeed a firmware side issue, it explains why Kenneth's XPS doesn't have this issue anymore after some BIOS updates. Kai-Heng > > Bjorn > > [1] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-dmesg-L1762 > [2] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-lspci-before-suspend-log-L136 > [3] https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3#file-lspci-after-suspend-log-L136 > [4] https://lore.kernel.org/r/CAFJ_xbr5NjoV1jC3P93N4UgooUuNdCRnrX7HuK=xLtPM5y7EjA@mail.gmail.com > [5] https://lore.kernel.org/r/CAFJ_xboyQyEaDeQ+pZH_YqN52-ALGNqzmmzeyNt6X_Cz-c1w9Q@mail.gmail.com
On 8/23/2022 8:25 PM, Kai-Heng Feng wrote: > External email: Use caution opening links or attachments > > > Hi Vidya, > > On Tue, Aug 9, 2022 at 12:17 AM Vidya Sagar <vidyas@nvidia.com> wrote: >> >> Thanks Lukasz for the update. >> I think confirms that there is no issue with the patch as such. >> Bjorn, could you please define the next step for this patch? > > I think the L1SS cap went away _after_ L1SS registers are restored, > since your patch already check the cap before doing any write: > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > + if (!aspm_l1ss) > + return; > > That means it's more likely to be caused by the following change: > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > So is it possible to clear PCI_L1SS_CTL1 before setting PCI_L1SS_CTL2, > like what aspm_calc_l1ss_info() does? I posted a new patch https://patchwork.kernel.org/project/linux-pci/patch/20220826125526.28859-1-vidyas@nvidia.com/ keeping L1.2 disabled while restoring the rest of the fields in Control-1 register and restoring the L1.2 enable bits later. Could you please try this new patch on your setup and update your observations? Thanks & Regards, Vidya Sagar > > Kai-Heng > >> >> Thanks, >> Vidya Sagar >> >> On 8/8/2022 7:37 PM, Lukasz Majczak wrote: >>> External email: Use caution opening links or attachments >>> >>> >>> śr., 3 sie 2022 o 14:55 Vidya Sagar <vidyas@nvidia.com> napisał(a): >>>> >>>> Thanks Lukasz for the logs. >>>> I still that the L1SS capability in the root port (00:14.0) disappeared >>>> after resume. >>>> I still don't understand how this patch can make the capability register >>>> itself disappear. Honestly, I still see this as a HW issue. >>>> Bjorn, could you please throw some light on this? >>>> >>>> Thanks, >>>> Vidya Sagar >>>> >>>> On 8/3/2022 5:34 PM, Lukasz Majczak wrote: >>>>> External email: Use caution opening links or attachments >>>>> >>>>> >>>>> pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): >>>>>> >>>>>> Hi Lukasz, >>>>>> Thanks for sharing your observations. >>>>>> >>>>>> Could you please also share the output of 'sudo lspci -vvvv' before and >>>>>> after suspend-resume cycle with the latest linux-next? >>>>>> Do we still see the L1SS capabilities getting disappeared post resume? >>>>>> >>>>>> Thanks, >>>>>> Vidya Sagar >>>>>> >>>>>> On 7/29/2022 3:09 PM, Lukasz Majczak wrote: >>>>>>> External email: Use caution opening links or attachments >>>>>>> >>>>>>> >>>>>>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): >>>>>>>> >>>>>>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): >>>>>>>>> >>>>>>>>> Hello, >>>>>>>>> >>>>>>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>>>>>> >>>>>>>>>> Agree with Bjorn's observations. >>>>>>>>>> The fact that the L1SS capability registers themselves disappeared in >>>>>>>>>> the root port post resume indicates that there seems to be something >>>>>>>>>> wrong with the BIOS itself. >>>>>>>>>> Could you please check from that perspective? >>>>>>>>> >>>>>>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This >>>>>>>>> is a shallower sleep state that preserves more state than, for e.g. S3 >>>>>>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture >>>>>>>>> at all. i.e. after the kernel runs its suspend routines, it just puts >>>>>>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to >>>>>>>>> this. >>>>>>>>> >>>>>>>>> >>>>>>>>>> >>>>>>>>>> Thanks, >>>>>>>>>> Vidya Sagar >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: >>>>>>>>>>> External email: Use caution opening links or attachments >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: >>>>>>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): >>>>>>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: >>>>>>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't >>>>>>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates >>>>>>>>>>>>>>> configuration being lost post-resume. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Save the L1 Substates control registers so that the configuration is >>>>>>>>>>>>>>> retained post-resume. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> >>>>>>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> >>>>>>>>>>>>>> >>>>>>>>>>>>>> Hi Vidya, >>>>>>>>>>>>>> >>>>>>>>>>>>>> I tested this patch on kernel v5.19-rc6. >>>>>>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. >>>>>>>>>>>>>> This patch can restore L1SS after suspend/resume. >>>>>>>>>>>>>> >>>>>>>>>>>>>> The test results are as follows: >>>>>>>>>>>>>> >>>>>>>>>>>>>> After Boot: >>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> After suspend/resume without this patch. >>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=10us >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> After suspend/resume with this patch. >>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> >>>>>>>>>>>>> >>>>>>>>>>>>> Forgot to add mine: >>>>>>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> >>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> Best regards, >>>>>>>>>>>>>> Ben Chuang >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>>> --- >>>>>>>>>>>>>>> Hi, >>>>>>>>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch >>>>>>>>>>>>>>> on your laptop (Dell XPS 13) one last time? >>>>>>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch >>>>>>>>>>>>>>> could be due to a buggy old version BIOS in the laptop. >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Thanks, >>>>>>>>>>>>>>> Vidya Sagar >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> drivers/pci/pci.c | 7 +++++++ >>>>>>>>>>>>>>> drivers/pci/pci.h | 4 ++++ >>>>>>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ >>>>>>>>>>>>>>> 3 files changed, 55 insertions(+) >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c >>>>>>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 >>>>>>>>>>>>>>> --- a/drivers/pci/pci.c >>>>>>>>>>>>>>> +++ b/drivers/pci/pci.c >>>>>>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) >>>>>>>>>>>>>>> return i; >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> pci_save_ltr_state(dev); >>>>>>>>>>>>>>> + pci_save_aspm_l1ss_state(dev); >>>>>>>>>>>>>>> pci_save_dpc_state(dev); >>>>>>>>>>>>>>> pci_save_aer_state(dev); >>>>>>>>>>>>>>> pci_save_ptm_state(dev); >>>>>>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) >>>>>>>>>>>>>>> * LTR itself (in the PCIe capability). >>>>>>>>>>>>>>> */ >>>>>>>>>>>>>>> pci_restore_ltr_state(dev); >>>>>>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev); >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> pci_restore_pcie_state(dev); >>>>>>>>>>>>>>> pci_restore_pasid_state(dev); >>>>>>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) >>>>>>>>>>>>>>> if (error) >>>>>>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, >>>>>>>>>>>>>>> + 2 * sizeof(u32)); >>>>>>>>>>>>>>> + if (error) >>>>>>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> pci_allocate_vc_save_buffers(dev); >>>>>>>>>>>>>>> } >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h >>>>>>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 >>>>>>>>>>>>>>> --- a/drivers/pci/pci.h >>>>>>>>>>>>>>> +++ b/drivers/pci/pci.h >>>>>>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); >>>>>>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); >>>>>>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); >>>>>>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); >>>>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>>>>>>>> #else >>>>>>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } >>>>>>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } >>>>>>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } >>>>>>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } >>>>>>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>>>>>>>> #endif >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC >>>>>>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c >>>>>>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 >>>>>>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c >>>>>>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c >>>>>>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) >>>>>>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); >>>>>>>>>>>>>>> } >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>>>>>>>> +{ >>>>>>>>>>>>>>> + int aspm_l1ss; >>>>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>>>>>>>> + u32 *cap; >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>>>> + if (!aspm_l1ss) >>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>>>> + if (!save_state) >>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); >>>>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); >>>>>>>>>>>>>>> +} >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>>>>>>>> +{ >>>>>>>>>>>>>>> + int aspm_l1ss; >>>>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>>>>>>>> + u32 *cap; >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>>>> + if (!aspm_l1ss) >>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>>>> + if (!save_state) >>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); >>>>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); >>>>>>>>>>>>>>> +} >>>>>>>>>>>>>>> + >>>>>>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) >>>>>>>>>>>>>>> { >>>>>>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, >>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>> 2.17.1 >>>>>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Hi, >>>>>>>>>>>> >>>>>>>>>>>> With this patch (and also mentioned >>>>>>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) >>>>>>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after >>>>>>>>>>>> suspend/resume with my WiFi card - it looks like whole communication >>>>>>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume >>>>>>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 >>>>>>>>>>>> >>>>>>>>>>>> I played a little bit with this code and it looks like the >>>>>>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know >>>>>>>>>>>> why, not a PCI expert). >>>>>>>>>>> >>>>>>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the >>>>>>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what >>>>>>>>>>> other changes are in chromeos-5.10. >>>>>>>>> >>>>>>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug >>>>>>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer >>>>>>>>> Intel platform that have the latest upstream kernel running already >>>>>>>>> and see if this can be reproduced there too? >>>>>>>>> Note that the wifi PCI device is different on newer Intel platforms, >>>>>>>>> but platform design is similar enough that I suspect we should see >>>>>>>>> similar bug on those too. The other option is to try the latest >>>>>>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and >>>>>>>>> ignore bringing up the graphics stack and GUI), it may come up >>>>>>>>> sufficiently enough to try this patch? >>>>>>>>> >>>>>>>>> Thanks, >>>>>>>>> >>>>>>>>> Rajat >>>>>>>>> >>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> Random observations, no analysis below. This from your dmesg >>>>>>>>>>> certainly looks like PCI reads failing and returning ~0: >>>>>>>>>>> >>>>>>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) >>>>>>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff >>>>>>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal >>>>>>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. >>>>>>>>>>> >>>>>>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been >>>>>>>>>>> reset (BAR is 0): >>>>>>>>>>> >>>>>>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 >>>>>>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] >>>>>>>>>>> >>>>>>>>>>> lspci diffs from before/after suspend: >>>>>>>>>>> >>>>>>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) >>>>>>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 >>>>>>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- >>>>>>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- >>>>>>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- >>>>>>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- >>>>>>>>>>> - Capabilities: [150 v0] Null >>>>>>>>>>> - Capabilities: [200 v1] L1 PM Substates >>>>>>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us >>>>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns >>>>>>>>>>> - L1SubCtl2: T_PwrOn=60us >>>>>>>>>>> >>>>>>>>>>> The DevSta differences might be BIOS bugs, probably not relevant. >>>>>>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after >>>>>>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability >>>>>>>>>>> disappeared. >>>>>>>>>>> >>>>>>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) >>>>>>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- >>>>>>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- >>>>>>>>>>> Capabilities: [154 v1] L1 PM Substates >>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us >>>>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns >>>>>>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>>>>>> >>>>>>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't >>>>>>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore >>>>>>>>>>> L1SubCtl1. >>>>>>>>>>> >>>>>>>>>>> Bjorn >>>>>>>>>>> >>>>>>>> >>>>>>>> Hi, >>>>>>>> >>>>>>>> Thank you all for the response and input! As Rajat mentioned I'm using >>>>>>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega >>>>>>>> (Apollolake) - I will try to load most recent kernel and give it a >>>>>>>> try once again. >>>>>>>> >>>>>>>> Best regards, >>>>>>>> Lukasz >>>>>>> >>>>>>> Hi, >>>>>>> >>>>>>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm >>>>>>> still getting same results: >>>>>>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 >>>>>>> >>>>>>> Best regards, >>>>>>> Lukasz >>>>>>> >>>>> Hi Vidya, >>>>> >>>>> Sorry for the long delay, I have retested your patch on top of >>>>> linux-next/master (next-20220802) - the results for my device remain >>>>> the same. >>>>> Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) >>>>> https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef >>>>> Let me know if you need any more logs and/or tests. >>>>> >>>>> Best regards, >>>>> Lukasz >>>>> >>> Hi Vidya, >>> >>> After your last email, I've re-tested my setup and (without your >>> patch) the capability register also disappears - so it looks there is >>> - in fact - some problem in my setup and your patch just brings it to >>> the top as after resume tries to write to a register that is no longer >>> present. I'm very sorry for the confusion here and I've not notice >>> that at the very beginning. >>> >>> Best regards, >>> Lukasz >>>
pt., 26 sie 2022 o 15:00 Vidya Sagar <vidyas@nvidia.com> napisał(a): > > > > On 8/23/2022 8:25 PM, Kai-Heng Feng wrote: > > External email: Use caution opening links or attachments > > > > > > Hi Vidya, > > > > On Tue, Aug 9, 2022 at 12:17 AM Vidya Sagar <vidyas@nvidia.com> wrote: > >> > >> Thanks Lukasz for the update. > >> I think confirms that there is no issue with the patch as such. > >> Bjorn, could you please define the next step for this patch? > > > > I think the L1SS cap went away _after_ L1SS registers are restored, > > since your patch already check the cap before doing any write: > > + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > > + if (!aspm_l1ss) > > + return; > > > > That means it's more likely to be caused by the following change: > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > > + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > > > > So is it possible to clear PCI_L1SS_CTL1 before setting PCI_L1SS_CTL2, > > like what aspm_calc_l1ss_info() does? > > I posted a new patch > https://patchwork.kernel.org/project/linux-pci/patch/20220826125526.28859-1-vidyas@nvidia.com/ > keeping L1.2 disabled while restoring the rest of the fields in > Control-1 register and restoring the L1.2 enable bits later. Could you > please try this new patch on your setup and update your observations? > > Thanks & Regards, > Vidya Sagar > > > > > Kai-Heng > > > >> > >> Thanks, > >> Vidya Sagar > >> > >> On 8/8/2022 7:37 PM, Lukasz Majczak wrote: > >>> External email: Use caution opening links or attachments > >>> > >>> > >>> śr., 3 sie 2022 o 14:55 Vidya Sagar <vidyas@nvidia.com> napisał(a): > >>>> > >>>> Thanks Lukasz for the logs. > >>>> I still that the L1SS capability in the root port (00:14.0) disappeared > >>>> after resume. > >>>> I still don't understand how this patch can make the capability register > >>>> itself disappear. Honestly, I still see this as a HW issue. > >>>> Bjorn, could you please throw some light on this? > >>>> > >>>> Thanks, > >>>> Vidya Sagar > >>>> > >>>> On 8/3/2022 5:34 PM, Lukasz Majczak wrote: > >>>>> External email: Use caution opening links or attachments > >>>>> > >>>>> > >>>>> pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): > >>>>>> > >>>>>> Hi Lukasz, > >>>>>> Thanks for sharing your observations. > >>>>>> > >>>>>> Could you please also share the output of 'sudo lspci -vvvv' before and > >>>>>> after suspend-resume cycle with the latest linux-next? > >>>>>> Do we still see the L1SS capabilities getting disappeared post resume? > >>>>>> > >>>>>> Thanks, > >>>>>> Vidya Sagar > >>>>>> > >>>>>> On 7/29/2022 3:09 PM, Lukasz Majczak wrote: > >>>>>>> External email: Use caution opening links or attachments > >>>>>>> > >>>>>>> > >>>>>>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): > >>>>>>>> > >>>>>>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): > >>>>>>>>> > >>>>>>>>> Hello, > >>>>>>>>> > >>>>>>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>>>>>> > >>>>>>>>>> Agree with Bjorn's observations. > >>>>>>>>>> The fact that the L1SS capability registers themselves disappeared in > >>>>>>>>>> the root port post resume indicates that there seems to be something > >>>>>>>>>> wrong with the BIOS itself. > >>>>>>>>>> Could you please check from that perspective? > >>>>>>>>> > >>>>>>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This > >>>>>>>>> is a shallower sleep state that preserves more state than, for e.g. S3 > >>>>>>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture > >>>>>>>>> at all. i.e. after the kernel runs its suspend routines, it just puts > >>>>>>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to > >>>>>>>>> this. > >>>>>>>>> > >>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> Thanks, > >>>>>>>>>> Vidya Sagar > >>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > >>>>>>>>>>> External email: Use caution opening links or attachments > >>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > >>>>>>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > >>>>>>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > >>>>>>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > >>>>>>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates > >>>>>>>>>>>>>>> configuration being lost post-resume. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> Save the L1 Substates control registers so that the configuration is > >>>>>>>>>>>>>>> retained post-resume. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > >>>>>>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> Hi Vidya, > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> I tested this patch on kernel v5.19-rc6. > >>>>>>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. > >>>>>>>>>>>>>> This patch can restore L1SS after suspend/resume. > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> The test results are as follows: > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> After Boot: > >>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> After suspend/resume without this patch. > >>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=10us > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> After suspend/resume with this patch. > >>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> > >>>>>>>>>>>>> > >>>>>>>>>>>>> Forgot to add mine: > >>>>>>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > >>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> Best regards, > >>>>>>>>>>>>>> Ben Chuang > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>>> --- > >>>>>>>>>>>>>>> Hi, > >>>>>>>>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > >>>>>>>>>>>>>>> on your laptop (Dell XPS 13) one last time? > >>>>>>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch > >>>>>>>>>>>>>>> could be due to a buggy old version BIOS in the laptop. > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> Thanks, > >>>>>>>>>>>>>>> Vidya Sagar > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> drivers/pci/pci.c | 7 +++++++ > >>>>>>>>>>>>>>> drivers/pci/pci.h | 4 ++++ > >>>>>>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > >>>>>>>>>>>>>>> 3 files changed, 55 insertions(+) > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > >>>>>>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 > >>>>>>>>>>>>>>> --- a/drivers/pci/pci.c > >>>>>>>>>>>>>>> +++ b/drivers/pci/pci.c > >>>>>>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > >>>>>>>>>>>>>>> return i; > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> pci_save_ltr_state(dev); > >>>>>>>>>>>>>>> + pci_save_aspm_l1ss_state(dev); > >>>>>>>>>>>>>>> pci_save_dpc_state(dev); > >>>>>>>>>>>>>>> pci_save_aer_state(dev); > >>>>>>>>>>>>>>> pci_save_ptm_state(dev); > >>>>>>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > >>>>>>>>>>>>>>> * LTR itself (in the PCIe capability). > >>>>>>>>>>>>>>> */ > >>>>>>>>>>>>>>> pci_restore_ltr_state(dev); > >>>>>>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev); > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> pci_restore_pcie_state(dev); > >>>>>>>>>>>>>>> pci_restore_pasid_state(dev); > >>>>>>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > >>>>>>>>>>>>>>> if (error) > >>>>>>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > >>>>>>>>>>>>>>> + 2 * sizeof(u32)); > >>>>>>>>>>>>>>> + if (error) > >>>>>>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> pci_allocate_vc_save_buffers(dev); > >>>>>>>>>>>>>>> } > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > >>>>>>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 > >>>>>>>>>>>>>>> --- a/drivers/pci/pci.h > >>>>>>>>>>>>>>> +++ b/drivers/pci/pci.h > >>>>>>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > >>>>>>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); > >>>>>>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); > >>>>>>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > >>>>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>>>>>>>> #else > >>>>>>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > >>>>>>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > >>>>>>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > >>>>>>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > >>>>>>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>>>>>>>> #endif > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC > >>>>>>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 > >>>>>>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > >>>>>>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); > >>>>>>>>>>>>>>> } > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>>>>>>>> +{ > >>>>>>>>>>>>>>> + int aspm_l1ss; > >>>>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>>>>>>>> + u32 *cap; > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>>>> + if (!save_state) > >>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > >>>>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > >>>>>>>>>>>>>>> +} > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>>>>>>>> +{ > >>>>>>>>>>>>>>> + int aspm_l1ss; > >>>>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>>>>>>>> + u32 *cap; > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>>>> + if (!save_state) > >>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > >>>>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > >>>>>>>>>>>>>>> +} > >>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > >>>>>>>>>>>>>>> { > >>>>>>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > >>>>>>>>>>>>>>> -- > >>>>>>>>>>>>>>> 2.17.1 > >>>>>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> Hi, > >>>>>>>>>>>> > >>>>>>>>>>>> With this patch (and also mentioned > >>>>>>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > >>>>>>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after > >>>>>>>>>>>> suspend/resume with my WiFi card - it looks like whole communication > >>>>>>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > >>>>>>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > >>>>>>>>>>>> > >>>>>>>>>>>> I played a little bit with this code and it looks like the > >>>>>>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > >>>>>>>>>>>> why, not a PCI expert). > >>>>>>>>>>> > >>>>>>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the > >>>>>>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what > >>>>>>>>>>> other changes are in chromeos-5.10. > >>>>>>>>> > >>>>>>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug > >>>>>>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer > >>>>>>>>> Intel platform that have the latest upstream kernel running already > >>>>>>>>> and see if this can be reproduced there too? > >>>>>>>>> Note that the wifi PCI device is different on newer Intel platforms, > >>>>>>>>> but platform design is similar enough that I suspect we should see > >>>>>>>>> similar bug on those too. The other option is to try the latest > >>>>>>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and > >>>>>>>>> ignore bringing up the graphics stack and GUI), it may come up > >>>>>>>>> sufficiently enough to try this patch? > >>>>>>>>> > >>>>>>>>> Thanks, > >>>>>>>>> > >>>>>>>>> Rajat > >>>>>>>>> > >>>>>>>>> > >>>>>>>>>>> > >>>>>>>>>>> Random observations, no analysis below. This from your dmesg > >>>>>>>>>>> certainly looks like PCI reads failing and returning ~0: > >>>>>>>>>>> > >>>>>>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > >>>>>>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > >>>>>>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal > >>>>>>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > >>>>>>>>>>> > >>>>>>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been > >>>>>>>>>>> reset (BAR is 0): > >>>>>>>>>>> > >>>>>>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > >>>>>>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > >>>>>>>>>>> > >>>>>>>>>>> lspci diffs from before/after suspend: > >>>>>>>>>>> > >>>>>>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > >>>>>>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > >>>>>>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > >>>>>>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > >>>>>>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > >>>>>>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > >>>>>>>>>>> - Capabilities: [150 v0] Null > >>>>>>>>>>> - Capabilities: [200 v1] L1 PM Substates > >>>>>>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > >>>>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns > >>>>>>>>>>> - L1SubCtl2: T_PwrOn=60us > >>>>>>>>>>> > >>>>>>>>>>> The DevSta differences might be BIOS bugs, probably not relevant. > >>>>>>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after > >>>>>>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability > >>>>>>>>>>> disappeared. > >>>>>>>>>>> > >>>>>>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > >>>>>>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > >>>>>>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > >>>>>>>>>>> Capabilities: [154 v1] L1 PM Substates > >>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > >>>>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns > >>>>>>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>>>>>> > >>>>>>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > >>>>>>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore > >>>>>>>>>>> L1SubCtl1. > >>>>>>>>>>> > >>>>>>>>>>> Bjorn > >>>>>>>>>>> > >>>>>>>> > >>>>>>>> Hi, > >>>>>>>> > >>>>>>>> Thank you all for the response and input! As Rajat mentioned I'm using > >>>>>>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega > >>>>>>>> (Apollolake) - I will try to load most recent kernel and give it a > >>>>>>>> try once again. > >>>>>>>> > >>>>>>>> Best regards, > >>>>>>>> Lukasz > >>>>>>> > >>>>>>> Hi, > >>>>>>> > >>>>>>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm > >>>>>>> still getting same results: > >>>>>>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 > >>>>>>> > >>>>>>> Best regards, > >>>>>>> Lukasz > >>>>>>> > >>>>> Hi Vidya, > >>>>> > >>>>> Sorry for the long delay, I have retested your patch on top of > >>>>> linux-next/master (next-20220802) - the results for my device remain > >>>>> the same. > >>>>> Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) > >>>>> https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef > >>>>> Let me know if you need any more logs and/or tests. > >>>>> > >>>>> Best regards, > >>>>> Lukasz > >>>>> > >>> Hi Vidya, > >>> > >>> After your last email, I've re-tested my setup and (without your > >>> patch) the capability register also disappears - so it looks there is > >>> - in fact - some problem in my setup and your patch just brings it to > >>> the top as after resume tries to write to a register that is no longer > >>> present. I'm very sorry for the confusion here and I've not notice > >>> that at the very beginning. > >>> > >>> Best regards, > >>> Lukasz > >>> Hi Vidya, For me (on Apollolake devices) the results remain the same, but as I've mentioned earlier - it looks very much related exactly to the Apollolake and is not directly related to your patch (e.g. I'm losing L1SS capabilities even without your patch). As a counter example, I don't observe any issues with your patach (v3) on Amberlake devices - lspci -vvv before suspend and after resume are exactly the same. Best regards, Lukasz
On 8/30/2022 4:45 PM, Lukasz Majczak wrote: > External email: Use caution opening links or attachments > > > pt., 26 sie 2022 o 15:00 Vidya Sagar <vidyas@nvidia.com> napisał(a): >> >> >> >> On 8/23/2022 8:25 PM, Kai-Heng Feng wrote: >>> External email: Use caution opening links or attachments >>> >>> >>> Hi Vidya, >>> >>> On Tue, Aug 9, 2022 at 12:17 AM Vidya Sagar <vidyas@nvidia.com> wrote: >>>> >>>> Thanks Lukasz for the update. >>>> I think confirms that there is no issue with the patch as such. >>>> Bjorn, could you please define the next step for this patch? >>> >>> I think the L1SS cap went away _after_ L1SS registers are restored, >>> since your patch already check the cap before doing any write: >>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>> + if (!aspm_l1ss) >>> + return; >>> >>> That means it's more likely to be caused by the following change: >>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); >>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); >>> >>> So is it possible to clear PCI_L1SS_CTL1 before setting PCI_L1SS_CTL2, >>> like what aspm_calc_l1ss_info() does? >> >> I posted a new patch >> https://patchwork.kernel.org/project/linux-pci/patch/20220826125526.28859-1-vidyas@nvidia.com/ >> keeping L1.2 disabled while restoring the rest of the fields in >> Control-1 register and restoring the L1.2 enable bits later. Could you >> please try this new patch on your setup and update your observations? >> >> Thanks & Regards, >> Vidya Sagar >> >>> >>> Kai-Heng >>> >>>> >>>> Thanks, >>>> Vidya Sagar >>>> >>>> On 8/8/2022 7:37 PM, Lukasz Majczak wrote: >>>>> External email: Use caution opening links or attachments >>>>> >>>>> >>>>> śr., 3 sie 2022 o 14:55 Vidya Sagar <vidyas@nvidia.com> napisał(a): >>>>>> >>>>>> Thanks Lukasz for the logs. >>>>>> I still that the L1SS capability in the root port (00:14.0) disappeared >>>>>> after resume. >>>>>> I still don't understand how this patch can make the capability register >>>>>> itself disappear. Honestly, I still see this as a HW issue. >>>>>> Bjorn, could you please throw some light on this? >>>>>> >>>>>> Thanks, >>>>>> Vidya Sagar >>>>>> >>>>>> On 8/3/2022 5:34 PM, Lukasz Majczak wrote: >>>>>>> External email: Use caution opening links or attachments >>>>>>> >>>>>>> >>>>>>> pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): >>>>>>>> >>>>>>>> Hi Lukasz, >>>>>>>> Thanks for sharing your observations. >>>>>>>> >>>>>>>> Could you please also share the output of 'sudo lspci -vvvv' before and >>>>>>>> after suspend-resume cycle with the latest linux-next? >>>>>>>> Do we still see the L1SS capabilities getting disappeared post resume? >>>>>>>> >>>>>>>> Thanks, >>>>>>>> Vidya Sagar >>>>>>>> >>>>>>>> On 7/29/2022 3:09 PM, Lukasz Majczak wrote: >>>>>>>>> External email: Use caution opening links or attachments >>>>>>>>> >>>>>>>>> >>>>>>>>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): >>>>>>>>>> >>>>>>>>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): >>>>>>>>>>> >>>>>>>>>>> Hello, >>>>>>>>>>> >>>>>>>>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>>>>>>>> >>>>>>>>>>>> Agree with Bjorn's observations. >>>>>>>>>>>> The fact that the L1SS capability registers themselves disappeared in >>>>>>>>>>>> the root port post resume indicates that there seems to be something >>>>>>>>>>>> wrong with the BIOS itself. >>>>>>>>>>>> Could you please check from that perspective? >>>>>>>>>>> >>>>>>>>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This >>>>>>>>>>> is a shallower sleep state that preserves more state than, for e.g. S3 >>>>>>>>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture >>>>>>>>>>> at all. i.e. after the kernel runs its suspend routines, it just puts >>>>>>>>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to >>>>>>>>>>> this. >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> Thanks, >>>>>>>>>>>> Vidya Sagar >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: >>>>>>>>>>>>> External email: Use caution opening links or attachments >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: >>>>>>>>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): >>>>>>>>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: >>>>>>>>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't >>>>>>>>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates >>>>>>>>>>>>>>>>> configuration being lost post-resume. >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> Save the L1 Substates control registers so that the configuration is >>>>>>>>>>>>>>>>> retained post-resume. >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> >>>>>>>>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Hi Vidya, >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> I tested this patch on kernel v5.19-rc6. >>>>>>>>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. >>>>>>>>>>>>>>>> This patch can restore L1SS after suspend/resume. >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> The test results are as follows: >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> After Boot: >>>>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> After suspend/resume without this patch. >>>>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=10us >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> After suspend/resume with this patch. >>>>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" >>>>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates >>>>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ >>>>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>>>>>> PortCommonModeRestoreTime=255us >>>>>>>>>>>>>>>> PortTPowerOnTime=3100us >>>>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns >>>>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Forgot to add mine: >>>>>>>>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Best regards, >>>>>>>>>>>>>>>> Ben Chuang >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> --- >>>>>>>>>>>>>>>>> Hi, >>>>>>>>>>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch >>>>>>>>>>>>>>>>> on your laptop (Dell XPS 13) one last time? >>>>>>>>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch >>>>>>>>>>>>>>>>> could be due to a buggy old version BIOS in the laptop. >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> Thanks, >>>>>>>>>>>>>>>>> Vidya Sagar >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> drivers/pci/pci.c | 7 +++++++ >>>>>>>>>>>>>>>>> drivers/pci/pci.h | 4 ++++ >>>>>>>>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ >>>>>>>>>>>>>>>>> 3 files changed, 55 insertions(+) >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c >>>>>>>>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 >>>>>>>>>>>>>>>>> --- a/drivers/pci/pci.c >>>>>>>>>>>>>>>>> +++ b/drivers/pci/pci.c >>>>>>>>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) >>>>>>>>>>>>>>>>> return i; >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> pci_save_ltr_state(dev); >>>>>>>>>>>>>>>>> + pci_save_aspm_l1ss_state(dev); >>>>>>>>>>>>>>>>> pci_save_dpc_state(dev); >>>>>>>>>>>>>>>>> pci_save_aer_state(dev); >>>>>>>>>>>>>>>>> pci_save_ptm_state(dev); >>>>>>>>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) >>>>>>>>>>>>>>>>> * LTR itself (in the PCIe capability). >>>>>>>>>>>>>>>>> */ >>>>>>>>>>>>>>>>> pci_restore_ltr_state(dev); >>>>>>>>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev); >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> pci_restore_pcie_state(dev); >>>>>>>>>>>>>>>>> pci_restore_pasid_state(dev); >>>>>>>>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) >>>>>>>>>>>>>>>>> if (error) >>>>>>>>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, >>>>>>>>>>>>>>>>> + 2 * sizeof(u32)); >>>>>>>>>>>>>>>>> + if (error) >>>>>>>>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> pci_allocate_vc_save_buffers(dev); >>>>>>>>>>>>>>>>> } >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h >>>>>>>>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 >>>>>>>>>>>>>>>>> --- a/drivers/pci/pci.h >>>>>>>>>>>>>>>>> +++ b/drivers/pci/pci.h >>>>>>>>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); >>>>>>>>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); >>>>>>>>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); >>>>>>>>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); >>>>>>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); >>>>>>>>>>>>>>>>> #else >>>>>>>>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } >>>>>>>>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } >>>>>>>>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } >>>>>>>>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } >>>>>>>>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } >>>>>>>>>>>>>>>>> #endif >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC >>>>>>>>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c >>>>>>>>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 >>>>>>>>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c >>>>>>>>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c >>>>>>>>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) >>>>>>>>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); >>>>>>>>>>>>>>>>> } >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>>>>>>>>>> +{ >>>>>>>>>>>>>>>>> + int aspm_l1ss; >>>>>>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>>>>>>>>>> + u32 *cap; >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>>>>>> + if (!aspm_l1ss) >>>>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>>>>>> + if (!save_state) >>>>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); >>>>>>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); >>>>>>>>>>>>>>>>> +} >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) >>>>>>>>>>>>>>>>> +{ >>>>>>>>>>>>>>>>> + int aspm_l1ss; >>>>>>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; >>>>>>>>>>>>>>>>> + u32 *cap; >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> + if (!pci_is_pcie(dev)) >>>>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>>>>>> + if (!aspm_l1ss) >>>>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); >>>>>>>>>>>>>>>>> + if (!save_state) >>>>>>>>>>>>>>>>> + return; >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; >>>>>>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); >>>>>>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); >>>>>>>>>>>>>>>>> +} >>>>>>>>>>>>>>>>> + >>>>>>>>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) >>>>>>>>>>>>>>>>> { >>>>>>>>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, >>>>>>>>>>>>>>>>> -- >>>>>>>>>>>>>>>>> 2.17.1 >>>>>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> Hi, >>>>>>>>>>>>>> >>>>>>>>>>>>>> With this patch (and also mentioned >>>>>>>>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) >>>>>>>>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after >>>>>>>>>>>>>> suspend/resume with my WiFi card - it looks like whole communication >>>>>>>>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume >>>>>>>>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 >>>>>>>>>>>>>> >>>>>>>>>>>>>> I played a little bit with this code and it looks like the >>>>>>>>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know >>>>>>>>>>>>>> why, not a PCI expert). >>>>>>>>>>>>> >>>>>>>>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the >>>>>>>>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what >>>>>>>>>>>>> other changes are in chromeos-5.10. >>>>>>>>>>> >>>>>>>>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug >>>>>>>>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer >>>>>>>>>>> Intel platform that have the latest upstream kernel running already >>>>>>>>>>> and see if this can be reproduced there too? >>>>>>>>>>> Note that the wifi PCI device is different on newer Intel platforms, >>>>>>>>>>> but platform design is similar enough that I suspect we should see >>>>>>>>>>> similar bug on those too. The other option is to try the latest >>>>>>>>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and >>>>>>>>>>> ignore bringing up the graphics stack and GUI), it may come up >>>>>>>>>>> sufficiently enough to try this patch? >>>>>>>>>>> >>>>>>>>>>> Thanks, >>>>>>>>>>> >>>>>>>>>>> Rajat >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> Random observations, no analysis below. This from your dmesg >>>>>>>>>>>>> certainly looks like PCI reads failing and returning ~0: >>>>>>>>>>>>> >>>>>>>>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) >>>>>>>>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff >>>>>>>>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal >>>>>>>>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. >>>>>>>>>>>>> >>>>>>>>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been >>>>>>>>>>>>> reset (BAR is 0): >>>>>>>>>>>>> >>>>>>>>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 >>>>>>>>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] >>>>>>>>>>>>> >>>>>>>>>>>>> lspci diffs from before/after suspend: >>>>>>>>>>>>> >>>>>>>>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) >>>>>>>>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 >>>>>>>>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- >>>>>>>>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- >>>>>>>>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- >>>>>>>>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- >>>>>>>>>>>>> - Capabilities: [150 v0] Null >>>>>>>>>>>>> - Capabilities: [200 v1] L1 PM Substates >>>>>>>>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us >>>>>>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns >>>>>>>>>>>>> - L1SubCtl2: T_PwrOn=60us >>>>>>>>>>>>> >>>>>>>>>>>>> The DevSta differences might be BIOS bugs, probably not relevant. >>>>>>>>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after >>>>>>>>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability >>>>>>>>>>>>> disappeared. >>>>>>>>>>>>> >>>>>>>>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) >>>>>>>>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ >>>>>>>>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- >>>>>>>>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- >>>>>>>>>>>>> Capabilities: [154 v1] L1 PM Substates >>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ >>>>>>>>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us >>>>>>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ >>>>>>>>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns >>>>>>>>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- >>>>>>>>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns >>>>>>>>>>>>> >>>>>>>>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't >>>>>>>>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore >>>>>>>>>>>>> L1SubCtl1. >>>>>>>>>>>>> >>>>>>>>>>>>> Bjorn >>>>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Hi, >>>>>>>>>> >>>>>>>>>> Thank you all for the response and input! As Rajat mentioned I'm using >>>>>>>>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega >>>>>>>>>> (Apollolake) - I will try to load most recent kernel and give it a >>>>>>>>>> try once again. >>>>>>>>>> >>>>>>>>>> Best regards, >>>>>>>>>> Lukasz >>>>>>>>> >>>>>>>>> Hi, >>>>>>>>> >>>>>>>>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm >>>>>>>>> still getting same results: >>>>>>>>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 >>>>>>>>> >>>>>>>>> Best regards, >>>>>>>>> Lukasz >>>>>>>>> >>>>>>> Hi Vidya, >>>>>>> >>>>>>> Sorry for the long delay, I have retested your patch on top of >>>>>>> linux-next/master (next-20220802) - the results for my device remain >>>>>>> the same. >>>>>>> Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) >>>>>>> https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef >>>>>>> Let me know if you need any more logs and/or tests. >>>>>>> >>>>>>> Best regards, >>>>>>> Lukasz >>>>>>> >>>>> Hi Vidya, >>>>> >>>>> After your last email, I've re-tested my setup and (without your >>>>> patch) the capability register also disappears - so it looks there is >>>>> - in fact - some problem in my setup and your patch just brings it to >>>>> the top as after resume tries to write to a register that is no longer >>>>> present. I'm very sorry for the confusion here and I've not notice >>>>> that at the very beginning. >>>>> >>>>> Best regards, >>>>> Lukasz >>>>> > > Hi Vidya, > > For me (on Apollolake devices) the results remain the same, but as > I've mentioned earlier - it looks very much related exactly to the > Apollolake and is not directly related to your patch (e.g. I'm losing > L1SS capabilities even without your patch). > As a counter example, I don't observe any issues with your patach > (v3) on Amberlake devices - lspci -vvv before suspend and after resume > are exactly the same. Thanks for the update Lukasz. Anyway, i sent V3 fore review. Could you please review it and also test it on your platform? Thanks, Vidya Sagar > > Best regards, > Lukasz >
wt., 30 sie 2022 o 16:02 Vidya Sagar <vidyas@nvidia.com> napisał(a): > > > > On 8/30/2022 4:45 PM, Lukasz Majczak wrote: > > External email: Use caution opening links or attachments > > > > > > pt., 26 sie 2022 o 15:00 Vidya Sagar <vidyas@nvidia.com> napisał(a): > >> > >> > >> > >> On 8/23/2022 8:25 PM, Kai-Heng Feng wrote: > >>> External email: Use caution opening links or attachments > >>> > >>> > >>> Hi Vidya, > >>> > >>> On Tue, Aug 9, 2022 at 12:17 AM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>> > >>>> Thanks Lukasz for the update. > >>>> I think confirms that there is no issue with the patch as such. > >>>> Bjorn, could you please define the next step for this patch? > >>> > >>> I think the L1SS cap went away _after_ L1SS registers are restored, > >>> since your patch already check the cap before doing any write: > >>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>> + if (!aspm_l1ss) > >>> + return; > >>> > >>> That means it's more likely to be caused by the following change: > >>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > >>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > >>> > >>> So is it possible to clear PCI_L1SS_CTL1 before setting PCI_L1SS_CTL2, > >>> like what aspm_calc_l1ss_info() does? > >> > >> I posted a new patch > >> https://patchwork.kernel.org/project/linux-pci/patch/20220826125526.28859-1-vidyas@nvidia.com/ > >> keeping L1.2 disabled while restoring the rest of the fields in > >> Control-1 register and restoring the L1.2 enable bits later. Could you > >> please try this new patch on your setup and update your observations? > >> > >> Thanks & Regards, > >> Vidya Sagar > >> > >>> > >>> Kai-Heng > >>> > >>>> > >>>> Thanks, > >>>> Vidya Sagar > >>>> > >>>> On 8/8/2022 7:37 PM, Lukasz Majczak wrote: > >>>>> External email: Use caution opening links or attachments > >>>>> > >>>>> > >>>>> śr., 3 sie 2022 o 14:55 Vidya Sagar <vidyas@nvidia.com> napisał(a): > >>>>>> > >>>>>> Thanks Lukasz for the logs. > >>>>>> I still that the L1SS capability in the root port (00:14.0) disappeared > >>>>>> after resume. > >>>>>> I still don't understand how this patch can make the capability register > >>>>>> itself disappear. Honestly, I still see this as a HW issue. > >>>>>> Bjorn, could you please throw some light on this? > >>>>>> > >>>>>> Thanks, > >>>>>> Vidya Sagar > >>>>>> > >>>>>> On 8/3/2022 5:34 PM, Lukasz Majczak wrote: > >>>>>>> External email: Use caution opening links or attachments > >>>>>>> > >>>>>>> > >>>>>>> pt., 29 lip 2022 o 16:36 Vidya Sagar <vidyas@nvidia.com> napisał(a): > >>>>>>>> > >>>>>>>> Hi Lukasz, > >>>>>>>> Thanks for sharing your observations. > >>>>>>>> > >>>>>>>> Could you please also share the output of 'sudo lspci -vvvv' before and > >>>>>>>> after suspend-resume cycle with the latest linux-next? > >>>>>>>> Do we still see the L1SS capabilities getting disappeared post resume? > >>>>>>>> > >>>>>>>> Thanks, > >>>>>>>> Vidya Sagar > >>>>>>>> > >>>>>>>> On 7/29/2022 3:09 PM, Lukasz Majczak wrote: > >>>>>>>>> External email: Use caution opening links or attachments > >>>>>>>>> > >>>>>>>>> > >>>>>>>>> wt., 26 lip 2022 o 09:20 Lukasz Majczak <lma@semihalf.com> napisał(a): > >>>>>>>>>> > >>>>>>>>>> wt., 26 lip 2022 o 00:51 Rajat Jain <rajatja@google.com> napisał(a): > >>>>>>>>>>> > >>>>>>>>>>> Hello, > >>>>>>>>>>> > >>>>>>>>>>> On Sat, Jul 23, 2022 at 10:03 AM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>>>>>>>> > >>>>>>>>>>>> Agree with Bjorn's observations. > >>>>>>>>>>>> The fact that the L1SS capability registers themselves disappeared in > >>>>>>>>>>>> the root port post resume indicates that there seems to be something > >>>>>>>>>>>> wrong with the BIOS itself. > >>>>>>>>>>>> Could you please check from that perspective? > >>>>>>>>>>> > >>>>>>>>>>> ChromeOS Intel platforms use S0ix (suspend-to-idle) for suspend. This > >>>>>>>>>>> is a shallower sleep state that preserves more state than, for e.g. S3 > >>>>>>>>>>> (suspend-to-RAM). When we use S0ix, then BIOS does not come in picture > >>>>>>>>>>> at all. i.e. after the kernel runs its suspend routines, it just puts > >>>>>>>>>>> the CPU into S0ix state. So I do not think there is a BIOS angle to > >>>>>>>>>>> this. > >>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> Thanks, > >>>>>>>>>>>> Vidya Sagar > >>>>>>>>>>>> > >>>>>>>>>>>> > >>>>>>>>>>>> On 7/22/2022 11:12 PM, Bjorn Helgaas wrote: > >>>>>>>>>>>>> External email: Use caution opening links or attachments > >>>>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>>> On Fri, Jul 22, 2022 at 11:41:14AM +0200, Lukasz Majczak wrote: > >>>>>>>>>>>>>> pt., 22 lip 2022 o 09:31 Kai-Heng Feng <kai.heng.feng@canonical.com> napisał(a): > >>>>>>>>>>>>>>> On Fri, Jul 15, 2022 at 6:38 PM Ben Chuang <benchuanggli@gmail.com> wrote: > >>>>>>>>>>>>>>>> On Tue, Jul 5, 2022 at 2:00 PM Vidya Sagar <vidyas@nvidia.com> wrote: > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> Previously ASPM L1 Substates control registers (CTL1 and CTL2) weren't > >>>>>>>>>>>>>>>>> saved and restored during suspend/resume leading to L1 Substates > >>>>>>>>>>>>>>>>> configuration being lost post-resume. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> Save the L1 Substates control registers so that the configuration is > >>>>>>>>>>>>>>>>> retained post-resume. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > >>>>>>>>>>>>>>>>> Tested-by: Abhishek Sahu <abhsahu@nvidia.com> > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> Hi Vidya, > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> I tested this patch on kernel v5.19-rc6. > >>>>>>>>>>>>>>>> The test device is GL9755 card reader controller on Intel i5-10210U RVP. > >>>>>>>>>>>>>>>> This patch can restore L1SS after suspend/resume. > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> The test results are as follows: > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> After Boot: > >>>>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> After suspend/resume without this patch. > >>>>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=10us > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> After suspend/resume with this patch. > >>>>>>>>>>>>>>>> #lspci -d 17a0:9755 -vvv | grep -A5 "L1 PM Substates" > >>>>>>>>>>>>>>>> Capabilities: [110 v1] L1 PM Substates > >>>>>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ > >>>>>>>>>>>>>>>> ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>>>>>> PortCommonModeRestoreTime=255us > >>>>>>>>>>>>>>>> PortTPowerOnTime=3100us > >>>>>>>>>>>>>>>> L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>>>>>>> T_CommonMode=0us LTR1.2_Threshold=3145728ns > >>>>>>>>>>>>>>>> L1SubCtl2: T_PwrOn=3100us > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> Tested-by: Ben Chuang <benchuanggli@gmail.com> > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>> Forgot to add mine: > >>>>>>>>>>>>>>> Tested-by: Kai-Heng Feng <kai.heng.feng@canonical.com> > >>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> Best regards, > >>>>>>>>>>>>>>>> Ben Chuang > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> --- > >>>>>>>>>>>>>>>>> Hi, > >>>>>>>>>>>>>>>>> Kenneth R. Crudup <kenny@panix.com>, Could you please verify this patch > >>>>>>>>>>>>>>>>> on your laptop (Dell XPS 13) one last time? > >>>>>>>>>>>>>>>>> IMHO, the regression observed on your laptop with an old version of the patch > >>>>>>>>>>>>>>>>> could be due to a buggy old version BIOS in the laptop. > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> Thanks, > >>>>>>>>>>>>>>>>> Vidya Sagar > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> drivers/pci/pci.c | 7 +++++++ > >>>>>>>>>>>>>>>>> drivers/pci/pci.h | 4 ++++ > >>>>>>>>>>>>>>>>> drivers/pci/pcie/aspm.c | 44 +++++++++++++++++++++++++++++++++++++++++ > >>>>>>>>>>>>>>>>> 3 files changed, 55 insertions(+) > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > >>>>>>>>>>>>>>>>> index cfaf40a540a8..aca05880aaa3 100644 > >>>>>>>>>>>>>>>>> --- a/drivers/pci/pci.c > >>>>>>>>>>>>>>>>> +++ b/drivers/pci/pci.c > >>>>>>>>>>>>>>>>> @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) > >>>>>>>>>>>>>>>>> return i; > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> pci_save_ltr_state(dev); > >>>>>>>>>>>>>>>>> + pci_save_aspm_l1ss_state(dev); > >>>>>>>>>>>>>>>>> pci_save_dpc_state(dev); > >>>>>>>>>>>>>>>>> pci_save_aer_state(dev); > >>>>>>>>>>>>>>>>> pci_save_ptm_state(dev); > >>>>>>>>>>>>>>>>> @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) > >>>>>>>>>>>>>>>>> * LTR itself (in the PCIe capability). > >>>>>>>>>>>>>>>>> */ > >>>>>>>>>>>>>>>>> pci_restore_ltr_state(dev); > >>>>>>>>>>>>>>>>> + pci_restore_aspm_l1ss_state(dev); > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> pci_restore_pcie_state(dev); > >>>>>>>>>>>>>>>>> pci_restore_pasid_state(dev); > >>>>>>>>>>>>>>>>> @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) > >>>>>>>>>>>>>>>>> if (error) > >>>>>>>>>>>>>>>>> pci_err(dev, "unable to allocate suspend buffer for LTR\n"); > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, > >>>>>>>>>>>>>>>>> + 2 * sizeof(u32)); > >>>>>>>>>>>>>>>>> + if (error) > >>>>>>>>>>>>>>>>> + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> pci_allocate_vc_save_buffers(dev); > >>>>>>>>>>>>>>>>> } > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h > >>>>>>>>>>>>>>>>> index e10cdec6c56e..92d8c92662a4 100644 > >>>>>>>>>>>>>>>>> --- a/drivers/pci/pci.h > >>>>>>>>>>>>>>>>> +++ b/drivers/pci/pci.h > >>>>>>>>>>>>>>>>> @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); > >>>>>>>>>>>>>>>>> void pcie_aspm_exit_link_state(struct pci_dev *pdev); > >>>>>>>>>>>>>>>>> void pcie_aspm_pm_state_change(struct pci_dev *pdev); > >>>>>>>>>>>>>>>>> void pcie_aspm_powersave_config_link(struct pci_dev *pdev); > >>>>>>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); > >>>>>>>>>>>>>>>>> #else > >>>>>>>>>>>>>>>>> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } > >>>>>>>>>>>>>>>>> static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } > >>>>>>>>>>>>>>>>> static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } > >>>>>>>>>>>>>>>>> static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } > >>>>>>>>>>>>>>>>> +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>>>>>>>>>> +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } > >>>>>>>>>>>>>>>>> #endif > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> #ifdef CONFIG_PCIE_ECRC > >>>>>>>>>>>>>>>>> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>>>>>> index a96b7424c9bc..2c29fdd20059 100644 > >>>>>>>>>>>>>>>>> --- a/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>>>>>> +++ b/drivers/pci/pcie/aspm.c > >>>>>>>>>>>>>>>>> @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) > >>>>>>>>>>>>>>>>> PCI_L1SS_CTL1_L1SS_MASK, val); > >>>>>>>>>>>>>>>>> } > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>>> +void pci_save_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>>>>>>>>>> +{ > >>>>>>>>>>>>>>>>> + int aspm_l1ss; > >>>>>>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>>>>>>>>>> + u32 *cap; > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>>>>>> + if (!save_state) > >>>>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); > >>>>>>>>>>>>>>>>> + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); > >>>>>>>>>>>>>>>>> +} > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) > >>>>>>>>>>>>>>>>> +{ > >>>>>>>>>>>>>>>>> + int aspm_l1ss; > >>>>>>>>>>>>>>>>> + struct pci_cap_saved_state *save_state; > >>>>>>>>>>>>>>>>> + u32 *cap; > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> + if (!pci_is_pcie(dev)) > >>>>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>>>>>> + if (!aspm_l1ss) > >>>>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); > >>>>>>>>>>>>>>>>> + if (!save_state) > >>>>>>>>>>>>>>>>> + return; > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> + cap = (u32 *)&save_state->cap.data[0]; > >>>>>>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); > >>>>>>>>>>>>>>>>> + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); > >>>>>>>>>>>>>>>>> +} > >>>>>>>>>>>>>>>>> + > >>>>>>>>>>>>>>>>> static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) > >>>>>>>>>>>>>>>>> { > >>>>>>>>>>>>>>>>> pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL, > >>>>>>>>>>>>>>>>> -- > >>>>>>>>>>>>>>>>> 2.17.1 > >>>>>>>>>>>>>>>>> > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> Hi, > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> With this patch (and also mentioned > >>>>>>>>>>>>>> https://lore.kernel.org/all/20220509073639.2048236-1-kai.heng.feng@canonical.com/) > >>>>>>>>>>>>>> applied on 5.10 (chromeos-5.10) I am observing problems after > >>>>>>>>>>>>>> suspend/resume with my WiFi card - it looks like whole communication > >>>>>>>>>>>>>> via PCI fails. Attaching logs (dmesg, lspci -vvv before suspend/resume > >>>>>>>>>>>>>> and after) https://gist.github.com/semihalf-majczak-lukasz/fb36dfa2eff22911109dfb91ab0fc0e3 > >>>>>>>>>>>>>> > >>>>>>>>>>>>>> I played a little bit with this code and it looks like the > >>>>>>>>>>>>>> pci_write_config_dword() to the PCI_L1SS_CTL1 breaks it (don't know > >>>>>>>>>>>>>> why, not a PCI expert). > >>>>>>>>>>>>> > >>>>>>>>>>>>> Thanks a lot for testing this! I'm not quite sure what to make of the > >>>>>>>>>>>>> results since v5.10 is fairly old (Dec 2020) and I don't know what > >>>>>>>>>>>>> other changes are in chromeos-5.10. > >>>>>>>>>>> > >>>>>>>>>>> Lukasz: I assume you are running this on Atlas and are seeing this bug > >>>>>>>>>>> when uprev'ving it to 5.10 kernel. Can you please try it on a newer > >>>>>>>>>>> Intel platform that have the latest upstream kernel running already > >>>>>>>>>>> and see if this can be reproduced there too? > >>>>>>>>>>> Note that the wifi PCI device is different on newer Intel platforms, > >>>>>>>>>>> but platform design is similar enough that I suspect we should see > >>>>>>>>>>> similar bug on those too. The other option is to try the latest > >>>>>>>>>>> ustream kernel on Atlas. Perhaps if we just care about wifi (and > >>>>>>>>>>> ignore bringing up the graphics stack and GUI), it may come up > >>>>>>>>>>> sufficiently enough to try this patch? > >>>>>>>>>>> > >>>>>>>>>>> Thanks, > >>>>>>>>>>> > >>>>>>>>>>> Rajat > >>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>>>>>>> > >>>>>>>>>>>>> Random observations, no analysis below. This from your dmesg > >>>>>>>>>>>>> certainly looks like PCI reads failing and returning ~0: > >>>>>>>>>>>>> > >>>>>>>>>>>>> Timeout waiting for hardware access (CSR_GP_CNTRL 0xffffffff) > >>>>>>>>>>>>> iwlwifi 0000:01:00.0: 00000000: ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff ffffffff > >>>>>>>>>>>>> iwlwifi 0000:01:00.0: Device gone - attempting removal > >>>>>>>>>>>>> Hardware became unavailable upon resume. This could be a software issue prior to suspend or a hardware issue. > >>>>>>>>>>>>> > >>>>>>>>>>>>> And then we re-enumerate 01:00.0 and it looks like it may have been > >>>>>>>>>>>>> reset (BAR is 0): > >>>>>>>>>>>>> > >>>>>>>>>>>>> pci 0000:01:00.0: [8086:095a] type 00 class 0x028000 > >>>>>>>>>>>>> pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00001fff 64bit] > >>>>>>>>>>>>> > >>>>>>>>>>>>> lspci diffs from before/after suspend: > >>>>>>>>>>>>> > >>>>>>>>>>>>> 00:14.0 PCI bridge: Intel Corporation Celeron N3350/Pentium N4200/Atom E3900 Series PCI Express Port B #1 (rev fb) (prog-if 00 [Normal decode]) > >>>>>>>>>>>>> Bus: primary=00, secondary=01, subordinate=01, sec-latency=64 > >>>>>>>>>>>>> - DevSta: CorrErr- NonFatalErr+ FatalErr- UnsupReq+ AuxPwr+ TransPend- > >>>>>>>>>>>>> + DevSta: CorrErr+ NonFatalErr- FatalErr- UnsupReq- AuxPwr+ TransPend- > >>>>>>>>>>>>> - LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>>>>>> + LnkCtl: ASPM Disabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>>>>>> - LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete- EqualizationPhase1- > >>>>>>>>>>>>> + LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete- EqualizationPhase1- > >>>>>>>>>>>>> - Capabilities: [150 v0] Null > >>>>>>>>>>>>> - Capabilities: [200 v1] L1 PM Substates > >>>>>>>>>>>>> - L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>>> - PortCommonModeRestoreTime=40us PortTPowerOnTime=10us > >>>>>>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>>>> - T_CommonMode=40us LTR1.2_Threshold=98304ns > >>>>>>>>>>>>> - L1SubCtl2: T_PwrOn=60us > >>>>>>>>>>>>> > >>>>>>>>>>>>> The DevSta differences might be BIOS bugs, probably not relevant. > >>>>>>>>>>>>> Interesting that ASPM is disabled, maybe didn't get enabled after > >>>>>>>>>>>>> re-enumerating 01:00.0? Strange that the L1 PM Substates capability > >>>>>>>>>>>>> disappeared. > >>>>>>>>>>>>> > >>>>>>>>>>>>> 01:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59) > >>>>>>>>>>>>> LnkCtl: ASPM L1 Enabled; RCB 64 bytes, Disabled- CommClk+ > >>>>>>>>>>>>> - ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt- > >>>>>>>>>>>>> + ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > >>>>>>>>>>>>> Capabilities: [154 v1] L1 PM Substates > >>>>>>>>>>>>> L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+ > >>>>>>>>>>>>> PortCommonModeRestoreTime=30us PortTPowerOnTime=60us > >>>>>>>>>>>>> - L1SubCtl1: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ > >>>>>>>>>>>>> - T_CommonMode=0us LTR1.2_Threshold=98304ns > >>>>>>>>>>>>> + L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2- ASPM_L1.1- > >>>>>>>>>>>>> + T_CommonMode=0us LTR1.2_Threshold=0ns > >>>>>>>>>>>>> > >>>>>>>>>>>>> Dmesg claimed we reconfigured common clock config. Maybe ASPM didn't > >>>>>>>>>>>>> get reinitialized after re-enumeration? Looks like we didn't restore > >>>>>>>>>>>>> L1SubCtl1. > >>>>>>>>>>>>> > >>>>>>>>>>>>> Bjorn > >>>>>>>>>>>>> > >>>>>>>>>> > >>>>>>>>>> Hi, > >>>>>>>>>> > >>>>>>>>>> Thank you all for the response and input! As Rajat mentioned I'm using > >>>>>>>>>> chromebook - but not Atlas (Amberlake) - in this case it is Babymega > >>>>>>>>>> (Apollolake) - I will try to load most recent kernel and give it a > >>>>>>>>>> try once again. > >>>>>>>>>> > >>>>>>>>>> Best regards, > >>>>>>>>>> Lukasz > >>>>>>>>> > >>>>>>>>> Hi, > >>>>>>>>> > >>>>>>>>> I have applied this patch on top of v5.19-rc7 (chromeos) and I'm > >>>>>>>>> still getting same results: > >>>>>>>>> https://gist.github.com/semihalf-majczak-lukasz/4b716704c21a3758d6711b2030ea34b9 > >>>>>>>>> > >>>>>>>>> Best regards, > >>>>>>>>> Lukasz > >>>>>>>>> > >>>>>>> Hi Vidya, > >>>>>>> > >>>>>>> Sorry for the long delay, I have retested your patch on top of > >>>>>>> linux-next/master (next-20220802) - the results for my device remain > >>>>>>> the same. > >>>>>>> Here are the logs (lspci -vvv before suspend, lspci -vvv after resume and dmesg) > >>>>>>> https://gist.github.com/semihalf-majczak-lukasz/c7bfd811359f23278034056a8002b3ef > >>>>>>> Let me know if you need any more logs and/or tests. > >>>>>>> > >>>>>>> Best regards, > >>>>>>> Lukasz > >>>>>>> > >>>>> Hi Vidya, > >>>>> > >>>>> After your last email, I've re-tested my setup and (without your > >>>>> patch) the capability register also disappears - so it looks there is > >>>>> - in fact - some problem in my setup and your patch just brings it to > >>>>> the top as after resume tries to write to a register that is no longer > >>>>> present. I'm very sorry for the confusion here and I've not notice > >>>>> that at the very beginning. > >>>>> > >>>>> Best regards, > >>>>> Lukasz > >>>>> > > > > Hi Vidya, > > > > For me (on Apollolake devices) the results remain the same, but as > > I've mentioned earlier - it looks very much related exactly to the > > Apollolake and is not directly related to your patch (e.g. I'm losing > > L1SS capabilities even without your patch). > > As a counter example, I don't observe any issues with your patach > > (v3) on Amberlake devices - lspci -vvv before suspend and after resume > > are exactly the same. > > Thanks for the update Lukasz. > Anyway, i sent V3 fore review. Could you please review it and also test > it on your platform? > > Thanks, > Vidya Sagar > > > > > Best regards, > > Lukasz > > Hi Vidya, The results from my previous mail are for V3 of your patch; Amberlake - works fine Apollolake - still the same issue, but here it is not related to your changes (we are still working on this). Best regards, Lukasz
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index cfaf40a540a8..aca05880aaa3 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -1667,6 +1667,7 @@ int pci_save_state(struct pci_dev *dev) return i; pci_save_ltr_state(dev); + pci_save_aspm_l1ss_state(dev); pci_save_dpc_state(dev); pci_save_aer_state(dev); pci_save_ptm_state(dev); @@ -1773,6 +1774,7 @@ void pci_restore_state(struct pci_dev *dev) * LTR itself (in the PCIe capability). */ pci_restore_ltr_state(dev); + pci_restore_aspm_l1ss_state(dev); pci_restore_pcie_state(dev); pci_restore_pasid_state(dev); @@ -3489,6 +3491,11 @@ void pci_allocate_cap_save_buffers(struct pci_dev *dev) if (error) pci_err(dev, "unable to allocate suspend buffer for LTR\n"); + error = pci_add_ext_cap_save_buffer(dev, PCI_EXT_CAP_ID_L1SS, + 2 * sizeof(u32)); + if (error) + pci_err(dev, "unable to allocate suspend buffer for ASPM-L1SS\n"); + pci_allocate_vc_save_buffers(dev); } diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index e10cdec6c56e..92d8c92662a4 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -562,11 +562,15 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev); void pcie_aspm_exit_link_state(struct pci_dev *pdev); void pcie_aspm_pm_state_change(struct pci_dev *pdev); void pcie_aspm_powersave_config_link(struct pci_dev *pdev); +void pci_save_aspm_l1ss_state(struct pci_dev *dev); +void pci_restore_aspm_l1ss_state(struct pci_dev *dev); #else static inline void pcie_aspm_init_link_state(struct pci_dev *pdev) { } static inline void pcie_aspm_exit_link_state(struct pci_dev *pdev) { } static inline void pcie_aspm_pm_state_change(struct pci_dev *pdev) { } static inline void pcie_aspm_powersave_config_link(struct pci_dev *pdev) { } +static inline void pci_save_aspm_l1ss_state(struct pci_dev *dev) { } +static inline void pci_restore_aspm_l1ss_state(struct pci_dev *dev) { } #endif #ifdef CONFIG_PCIE_ECRC diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index a96b7424c9bc..2c29fdd20059 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -726,6 +726,50 @@ static void pcie_config_aspm_l1ss(struct pcie_link_state *link, u32 state) PCI_L1SS_CTL1_L1SS_MASK, val); } +void pci_save_aspm_l1ss_state(struct pci_dev *dev) +{ + int aspm_l1ss; + struct pci_cap_saved_state *save_state; + u32 *cap; + + if (!pci_is_pcie(dev)) + return; + + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); + if (!aspm_l1ss) + return; + + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); + if (!save_state) + return; + + cap = (u32 *)&save_state->cap.data[0]; + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, cap++); + pci_read_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, cap++); +} + +void pci_restore_aspm_l1ss_state(struct pci_dev *dev) +{ + int aspm_l1ss; + struct pci_cap_saved_state *save_state; + u32 *cap; + + if (!pci_is_pcie(dev)) + return; + + aspm_l1ss = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_L1SS); + if (!aspm_l1ss) + return; + + save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_L1SS); + if (!save_state) + return; + + cap = (u32 *)&save_state->cap.data[0]; + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL2, *cap++); + pci_write_config_dword(dev, aspm_l1ss + PCI_L1SS_CTL1, *cap++); +} + static void pcie_config_aspm_dev(struct pci_dev *pdev, u32 val) { pcie_capability_clear_and_set_word(pdev, PCI_EXP_LNKCTL,