| Message ID | 20190423082730.370-6-vidyas@nvidia.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add Tegra194 PCIe support | expand |
On Tue, Apr 23, 2019 at 01:57:19PM +0530, Vidya Sagar wrote: > Move PCIe config space capability search API to common DesignWare file > as this can be used by both host and ep mode codes. > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> > --- > Changes from [v3]: > * Rebased to linux-next top of the tree > > Changes from [v2]: > * None > > Changes from [v1]: > * Removed dw_pcie_find_next_ext_capability() API from here and made a > separate patch for that > > drivers/pci/controller/dwc/pcie-designware.c | 33 ++++++++++++++++++++ > drivers/pci/controller/dwc/pcie-designware.h | 2 ++ You claim this is a "move", but I only see adds. Where did it move *from*? While you're at it, can you add a comment in the code about why we can't use the regular pci_find_capability() interface? It's really a shame to have to reimplement that. > 2 files changed, 35 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c > index 8e0081ccf83b..6a98135244d6 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.c > +++ b/drivers/pci/controller/dwc/pcie-designware.c > @@ -20,6 +20,39 @@ > #define PCIE_PHY_DEBUG_R1_LINK_UP (0x1 << 4) > #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (0x1 << 29) > > +static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr, > + u8 cap) > +{ > + u8 cap_id, next_cap_ptr; > + u16 reg; > + > + reg = dw_pcie_readw_dbi(pci, cap_ptr); > + next_cap_ptr = (reg & 0xff00) >> 8; > + cap_id = (reg & 0x00ff); > + > + if (!next_cap_ptr || cap_id > PCI_CAP_ID_MAX) > + return 0; > + > + if (cap_id == cap) > + return cap_ptr; > + > + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); > +} > + > +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) > +{ > + u8 next_cap_ptr; > + u16 reg; > + > + reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST); > + next_cap_ptr = (reg & 0x00ff); > + > + if (!next_cap_ptr) > + return 0; > + > + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); > +} > + > int dw_pcie_read(void __iomem *addr, int size, u32 *val) > { > if (!IS_ALIGNED((uintptr_t)addr, size)) { > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > index 9ee98ced1ef6..35160b4ce929 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.h > +++ b/drivers/pci/controller/dwc/pcie-designware.h > @@ -248,6 +248,8 @@ struct dw_pcie { > #define to_dw_pcie_from_ep(endpoint) \ > container_of((endpoint), struct dw_pcie, ep) > > +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); > + > int dw_pcie_read(void __iomem *addr, int size, u32 *val); > int dw_pcie_write(void __iomem *addr, int size, u32 val); > > -- > 2.17.1 >
On 4/24/2019 2:02 AM, Bjorn Helgaas wrote: > On Tue, Apr 23, 2019 at 01:57:19PM +0530, Vidya Sagar wrote: >> Move PCIe config space capability search API to common DesignWare file >> as this can be used by both host and ep mode codes. >> >> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> >> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> >> --- >> Changes from [v3]: >> * Rebased to linux-next top of the tree >> >> Changes from [v2]: >> * None >> >> Changes from [v1]: >> * Removed dw_pcie_find_next_ext_capability() API from here and made a >> separate patch for that >> >> drivers/pci/controller/dwc/pcie-designware.c | 33 ++++++++++++++++++++ >> drivers/pci/controller/dwc/pcie-designware.h | 2 ++ > > You claim this is a "move", but I only see adds. Where did it move > *from*? These are supposed to be moved from pcie-designware-ep.c file. That was the case with my old patches but when I rebased them onto ToT, I missed the change that removes them from pcie-designware-ep.c file. Thanks for catching this. I'll address it in the next patch. > > While you're at it, can you add a comment in the code about why we > can't use the regular pci_find_capability() interface? It's really a > shame to have to reimplement that. Regular pci_find_capability() uses 'struct pci_dev *dev' pointer and can be used only after device enumeration is done. Whereas, these APIs are used particularly before link up and use 'struct dw_pcie *pci' pointer. > >> 2 files changed, 35 insertions(+) >> >> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c >> index 8e0081ccf83b..6a98135244d6 100644 >> --- a/drivers/pci/controller/dwc/pcie-designware.c >> +++ b/drivers/pci/controller/dwc/pcie-designware.c >> @@ -20,6 +20,39 @@ >> #define PCIE_PHY_DEBUG_R1_LINK_UP (0x1 << 4) >> #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (0x1 << 29) >> >> +static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr, >> + u8 cap) >> +{ >> + u8 cap_id, next_cap_ptr; >> + u16 reg; >> + >> + reg = dw_pcie_readw_dbi(pci, cap_ptr); >> + next_cap_ptr = (reg & 0xff00) >> 8; >> + cap_id = (reg & 0x00ff); >> + >> + if (!next_cap_ptr || cap_id > PCI_CAP_ID_MAX) >> + return 0; >> + >> + if (cap_id == cap) >> + return cap_ptr; >> + >> + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); >> +} >> + >> +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) >> +{ >> + u8 next_cap_ptr; >> + u16 reg; >> + >> + reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST); >> + next_cap_ptr = (reg & 0x00ff); >> + >> + if (!next_cap_ptr) >> + return 0; >> + >> + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); >> +} >> + >> int dw_pcie_read(void __iomem *addr, int size, u32 *val) >> { >> if (!IS_ALIGNED((uintptr_t)addr, size)) { >> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h >> index 9ee98ced1ef6..35160b4ce929 100644 >> --- a/drivers/pci/controller/dwc/pcie-designware.h >> +++ b/drivers/pci/controller/dwc/pcie-designware.h >> @@ -248,6 +248,8 @@ struct dw_pcie { >> #define to_dw_pcie_from_ep(endpoint) \ >> container_of((endpoint), struct dw_pcie, ep) >> >> +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); >> + >> int dw_pcie_read(void __iomem *addr, int size, u32 *val); >> int dw_pcie_write(void __iomem *addr, int size, u32 val); >> >> -- >> 2.17.1 >>
On Wed, Apr 24, 2019 at 1:12 PM Vidya Sagar <vidyas@nvidia.com> wrote: > > On 4/24/2019 2:02 AM, Bjorn Helgaas wrote: > > On Tue, Apr 23, 2019 at 01:57:19PM +0530, Vidya Sagar wrote: > >> Move PCIe config space capability search API to common DesignWare file > >> as this can be used by both host and ep mode codes. > >> > >> Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > >> Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> > >> --- > >> Changes from [v3]: > >> * Rebased to linux-next top of the tree > >> > >> Changes from [v2]: > >> * None > >> > >> Changes from [v1]: > >> * Removed dw_pcie_find_next_ext_capability() API from here and made a > >> separate patch for that > >> > >> drivers/pci/controller/dwc/pcie-designware.c | 33 ++++++++++++++++++++ > >> drivers/pci/controller/dwc/pcie-designware.h | 2 ++ > > > > You claim this is a "move", but I only see adds. Where did it move > > *from*? > These are supposed to be moved from pcie-designware-ep.c file. That was the case > with my old patches but when I rebased them onto ToT, I missed the change that > removes them from pcie-designware-ep.c file. Thanks for catching this. I'll > address it in the next patch. > > > > > While you're at it, can you add a comment in the code about why we > > can't use the regular pci_find_capability() interface? It's really a > > shame to have to reimplement that. > Regular pci_find_capability() uses 'struct pci_dev *dev' pointer and can be used > only after device enumeration is done. Whereas, these APIs are used particularly > before link up and use 'struct dw_pcie *pci' pointer. pci_bus_find_capability() can be used without enumerating the devices if you have a pci_bus. It's probably not worth using here though since you need this code anyway for endpoint mode. > > > > >> 2 files changed, 35 insertions(+) > >> > >> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c > >> index 8e0081ccf83b..6a98135244d6 100644 > >> --- a/drivers/pci/controller/dwc/pcie-designware.c > >> +++ b/drivers/pci/controller/dwc/pcie-designware.c > >> @@ -20,6 +20,39 @@ > >> #define PCIE_PHY_DEBUG_R1_LINK_UP (0x1 << 4) > >> #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (0x1 << 29) > >> > >> +static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr, > >> + u8 cap) > >> +{ > >> + u8 cap_id, next_cap_ptr; > >> + u16 reg; > >> + > >> + reg = dw_pcie_readw_dbi(pci, cap_ptr); > >> + next_cap_ptr = (reg & 0xff00) >> 8; > >> + cap_id = (reg & 0x00ff); > >> + > >> + if (!next_cap_ptr || cap_id > PCI_CAP_ID_MAX) > >> + return 0; > >> + > >> + if (cap_id == cap) > >> + return cap_ptr; > >> + > >> + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); > >> +} > >> + > >> +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) > >> +{ > >> + u8 next_cap_ptr; > >> + u16 reg; > >> + > >> + reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST); > >> + next_cap_ptr = (reg & 0x00ff); > >> + > >> + if (!next_cap_ptr) > >> + return 0; > >> + > >> + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); > >> +} > >> + > >> int dw_pcie_read(void __iomem *addr, int size, u32 *val) > >> { > >> if (!IS_ALIGNED((uintptr_t)addr, size)) { > >> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > >> index 9ee98ced1ef6..35160b4ce929 100644 > >> --- a/drivers/pci/controller/dwc/pcie-designware.h > >> +++ b/drivers/pci/controller/dwc/pcie-designware.h > >> @@ -248,6 +248,8 @@ struct dw_pcie { > >> #define to_dw_pcie_from_ep(endpoint) \ > >> container_of((endpoint), struct dw_pcie, ep) > >> > >> +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); > >> + > >> int dw_pcie_read(void __iomem *addr, int size, u32 *val); > >> int dw_pcie_write(void __iomem *addr, int size, u32 val); > >> > >> -- > >> 2.17.1 > >> >
On Tue, Apr 23, 2019 at 21:32:44, Bjorn Helgaas <helgaas@kernel.org> wrote: > On Tue, Apr 23, 2019 at 01:57:19PM +0530, Vidya Sagar wrote: > > Move PCIe config space capability search API to common DesignWare file > > as this can be used by both host and ep mode codes. > > > > Signed-off-by: Vidya Sagar <vidyas@nvidia.com> > > Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com> > > --- > > Changes from [v3]: > > * Rebased to linux-next top of the tree > > > > Changes from [v2]: > > * None > > > > Changes from [v1]: > > * Removed dw_pcie_find_next_ext_capability() API from here and made a > > separate patch for that > > > > drivers/pci/controller/dwc/pcie-designware.c | 33 ++++++++++++++++++++ > > drivers/pci/controller/dwc/pcie-designware.h | 2 ++ > > You claim this is a "move", but I only see adds. Where did it move > *from*? I'm guessing something was lost during the rebase. On v3 version, the removal was there. > > While you're at it, can you add a comment in the code about why we > can't use the regular pci_find_capability() interface? It's really a > shame to have to reimplement that. > > > 2 files changed, 35 insertions(+) > > > > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c > > index 8e0081ccf83b..6a98135244d6 100644 > > --- a/drivers/pci/controller/dwc/pcie-designware.c > > +++ b/drivers/pci/controller/dwc/pcie-designware.c > > @@ -20,6 +20,39 @@ > > #define PCIE_PHY_DEBUG_R1_LINK_UP (0x1 << 4) > > #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (0x1 << 29) > > > > +static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr, > > + u8 cap) > > +{ > > + u8 cap_id, next_cap_ptr; > > + u16 reg; > > + > > + reg = dw_pcie_readw_dbi(pci, cap_ptr); > > + next_cap_ptr = (reg & 0xff00) >> 8; > > + cap_id = (reg & 0x00ff); > > + > > + if (!next_cap_ptr || cap_id > PCI_CAP_ID_MAX) > > + return 0; > > + > > + if (cap_id == cap) > > + return cap_ptr; > > + > > + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); > > +} > > + > > +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) > > +{ > > + u8 next_cap_ptr; > > + u16 reg; > > + > > + reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST); > > + next_cap_ptr = (reg & 0x00ff); > > + > > + if (!next_cap_ptr) > > + return 0; > > + > > + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); > > +} > > + > > int dw_pcie_read(void __iomem *addr, int size, u32 *val) > > { > > if (!IS_ALIGNED((uintptr_t)addr, size)) { > > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > > index 9ee98ced1ef6..35160b4ce929 100644 > > --- a/drivers/pci/controller/dwc/pcie-designware.h > > +++ b/drivers/pci/controller/dwc/pcie-designware.h > > @@ -248,6 +248,8 @@ struct dw_pcie { > > #define to_dw_pcie_from_ep(endpoint) \ > > container_of((endpoint), struct dw_pcie, ep) > > > > +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); > > + > > int dw_pcie_read(void __iomem *addr, int size, u32 *val); > > int dw_pcie_write(void __iomem *addr, int size, u32 val); > > > > -- > > 2.17.1 > >
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 8e0081ccf83b..6a98135244d6 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -20,6 +20,39 @@ #define PCIE_PHY_DEBUG_R1_LINK_UP (0x1 << 4) #define PCIE_PHY_DEBUG_R1_LINK_IN_TRAINING (0x1 << 29) +static u8 __dw_pcie_find_next_cap(struct dw_pcie *pci, u8 cap_ptr, + u8 cap) +{ + u8 cap_id, next_cap_ptr; + u16 reg; + + reg = dw_pcie_readw_dbi(pci, cap_ptr); + next_cap_ptr = (reg & 0xff00) >> 8; + cap_id = (reg & 0x00ff); + + if (!next_cap_ptr || cap_id > PCI_CAP_ID_MAX) + return 0; + + if (cap_id == cap) + return cap_ptr; + + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); +} + +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap) +{ + u8 next_cap_ptr; + u16 reg; + + reg = dw_pcie_readw_dbi(pci, PCI_CAPABILITY_LIST); + next_cap_ptr = (reg & 0x00ff); + + if (!next_cap_ptr) + return 0; + + return __dw_pcie_find_next_cap(pci, next_cap_ptr, cap); +} + int dw_pcie_read(void __iomem *addr, int size, u32 *val) { if (!IS_ALIGNED((uintptr_t)addr, size)) { diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 9ee98ced1ef6..35160b4ce929 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -248,6 +248,8 @@ struct dw_pcie { #define to_dw_pcie_from_ep(endpoint) \ container_of((endpoint), struct dw_pcie, ep) +u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); + int dw_pcie_read(void __iomem *addr, int size, u32 *val); int dw_pcie_write(void __iomem *addr, int size, u32 val);