| Message ID | 1524167784-5911-2-git-send-email-okaya@codeaurora.org (mailing list archive) |
|---|---|
| State | New, archived |
| Delegated to: | Bjorn Helgaas |
| Headers | show |
Hi Bjorn, On 4/19/2018 3:56 PM, Sinan Kaya wrote: > The endpoint observing AER_FATAL error might be connected to a PCI hotplug > slot. Performing secondary bus reset on a hotplug slot causes PCI link > up/down interrupts. > > Hotplug driver removes the device from system when a link down interrupt > is observed and performs re-enumeration when link up interrupt is observed. > > This conflicts with what this code is trying to do. Try secondary bus > reset only if pci_reset_slot() fails/unsupported. > > Signed-off-by: Sinan Kaya <okaya@codeaurora.org> > --- > drivers/pci/pcie/aer/aerdrv.c | 3 ++- > drivers/pci/pcie/aer/aerdrv_core.c | 3 ++- > 2 files changed, 4 insertions(+), 2 deletions(-) > > diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c > index 779b387..4eaa524 100644 > --- a/drivers/pci/pcie/aer/aerdrv.c > +++ b/drivers/pci/pcie/aer/aerdrv.c > @@ -318,7 +318,8 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) > reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; > pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32); > > - pci_reset_bridge_secondary_bus(dev); > + if (pci_reset_slot(dev->slot)) > + pci_reset_bridge_secondary_bus(dev); > pci_printk(KERN_DEBUG, dev, "Root Port link has been reset\n"); > > /* Clear Root Error Status */ > diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c > index 0ea5acc..a915b0e6 100644 > --- a/drivers/pci/pcie/aer/aerdrv_core.c > +++ b/drivers/pci/pcie/aer/aerdrv_core.c > @@ -407,7 +407,8 @@ static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, > */ > static pci_ers_result_t default_reset_link(struct pci_dev *dev) > { > - pci_reset_bridge_secondary_bus(dev); > + if (pci_reset_slot(dev->slot)) > + pci_reset_bridge_secondary_bus(dev); > pci_printk(KERN_DEBUG, dev, "downstream link has been reset\n"); > return PCI_ERS_RESULT_RECOVERED; > } > If we put the 1/2 patch aside, what do you think about pulling this for 4.18? Sinan
diff --git a/drivers/pci/pcie/aer/aerdrv.c b/drivers/pci/pcie/aer/aerdrv.c index 779b387..4eaa524 100644 --- a/drivers/pci/pcie/aer/aerdrv.c +++ b/drivers/pci/pcie/aer/aerdrv.c @@ -318,7 +318,8 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev) reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK; pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32); - pci_reset_bridge_secondary_bus(dev); + if (pci_reset_slot(dev->slot)) + pci_reset_bridge_secondary_bus(dev); pci_printk(KERN_DEBUG, dev, "Root Port link has been reset\n"); /* Clear Root Error Status */ diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c index 0ea5acc..a915b0e6 100644 --- a/drivers/pci/pcie/aer/aerdrv_core.c +++ b/drivers/pci/pcie/aer/aerdrv_core.c @@ -407,7 +407,8 @@ static pci_ers_result_t broadcast_error_message(struct pci_dev *dev, */ static pci_ers_result_t default_reset_link(struct pci_dev *dev) { - pci_reset_bridge_secondary_bus(dev); + if (pci_reset_slot(dev->slot)) + pci_reset_bridge_secondary_bus(dev); pci_printk(KERN_DEBUG, dev, "downstream link has been reset\n"); return PCI_ERS_RESULT_RECOVERED; }
The endpoint observing AER_FATAL error might be connected to a PCI hotplug slot. Performing secondary bus reset on a hotplug slot causes PCI link up/down interrupts. Hotplug driver removes the device from system when a link down interrupt is observed and performs re-enumeration when link up interrupt is observed. This conflicts with what this code is trying to do. Try secondary bus reset only if pci_reset_slot() fails/unsupported. Signed-off-by: Sinan Kaya <okaya@codeaurora.org> --- drivers/pci/pcie/aer/aerdrv.c | 3 ++- drivers/pci/pcie/aer/aerdrv_core.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-)