| Message ID | 20210518174618.42089-2-shradha.t@samsung.com |
|---|---|
| State | New |
| Headers | show |
| Series | Add support for RAS DES feature in PCIe DW controller | expand |
Hi Shradha, [...] > +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap) > +{ > + u16 vsec = 0; > + u32 header; > + > + while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec, > + PCI_EXT_CAP_ID_VNDR))) { > + header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER); > + if (PCI_VNDR_HEADER_ID(header) == vsec_cap) > + return vsec; > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(dw_pcie_find_vsec_capability); A small question as I am curious: why not use pci_find_vsec_capability() here? The implementation looks very similar, which is why I am asking, but it might be that I am missing something, and for that I apologise in advance. Krzysztof
On 5/22/2021 5:01 AM, Krzysztof Wilczyński wrote: > External email: Use caution opening links or attachments > > > Hi Shradha, > > [...] >> +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap) >> +{ >> + u16 vsec = 0; >> + u32 header; >> + >> + while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec, >> + PCI_EXT_CAP_ID_VNDR))) { >> + header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER); >> + if (PCI_VNDR_HEADER_ID(header) == vsec_cap) >> + return vsec; >> + } >> + >> + return 0; >> +} >> +EXPORT_SYMBOL_GPL(dw_pcie_find_vsec_capability); > > A small question as I am curious: why not use pci_find_vsec_capability() > here? The implementation looks very similar, which is why I am asking, > but it might be that I am missing something, and for that I apologise in > advance. pci_find_vsec_capability() expects struct pci_dev * which we get only after enumeration is done. In the current scenario, we are still in pre-link up phase and don't have struct pci_dev * yet, hence this implementation, right Shradha?? > > Krzysztof >
On 5/18/2021 11:16 PM, Shradha Todi wrote: > External email: Use caution opening links or attachments > > > Add vendor specific extended configuration space capability search API > using struct dw_pcie pointer for DW controllers. > > Signed-off-by: Shradha Todi <shradha.t@samsung.com> > --- > drivers/pci/controller/dwc/pcie-designware.c | 16 ++++++++++++++++ > drivers/pci/controller/dwc/pcie-designware.h | 4 ++++ > 2 files changed, 20 insertions(+) > > diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c > index a945f0c0e73d..348f6f696976 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.c > +++ b/drivers/pci/controller/dwc/pcie-designware.c > @@ -90,6 +90,22 @@ static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start, > return 0; > } > > +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap) > +{ > + u16 vsec = 0; > + u32 header; > + > + while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec, > + PCI_EXT_CAP_ID_VNDR))) { > + header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER); > + if (PCI_VNDR_HEADER_ID(header) == vsec_cap) > + return vsec; > + } > + > + return 0; > +} > +EXPORT_SYMBOL_GPL(dw_pcie_find_vsec_capability); > + > u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap) > { > return dw_pcie_find_next_ext_capability(pci, 0, cap); > diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h > index 7d6e9b7576be..307525aaa063 100644 > --- a/drivers/pci/controller/dwc/pcie-designware.h > +++ b/drivers/pci/controller/dwc/pcie-designware.h > @@ -155,6 +155,9 @@ > #define MAX_IATU_IN 256 > #define MAX_IATU_OUT 256 > > +/* Synopsys Vendor specific data */ > +#define DW_PCIE_RAS_CAP_ID 0x2 This is not used in this patch. Better to move it to the second patch in this series where it is used. > + > struct pcie_port; > struct dw_pcie; > struct dw_pcie_ep; > @@ -284,6 +287,7 @@ struct dw_pcie { > > u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); > u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap); > +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_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 a945f0c0e73d..348f6f696976 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -90,6 +90,22 @@ static u16 dw_pcie_find_next_ext_capability(struct dw_pcie *pci, u16 start, return 0; } +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap) +{ + u16 vsec = 0; + u32 header; + + while ((vsec = dw_pcie_find_next_ext_capability(pci, vsec, + PCI_EXT_CAP_ID_VNDR))) { + header = dw_pcie_readl_dbi(pci, vsec + PCI_VNDR_HEADER); + if (PCI_VNDR_HEADER_ID(header) == vsec_cap) + return vsec; + } + + return 0; +} +EXPORT_SYMBOL_GPL(dw_pcie_find_vsec_capability); + u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap) { return dw_pcie_find_next_ext_capability(pci, 0, cap); diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h index 7d6e9b7576be..307525aaa063 100644 --- a/drivers/pci/controller/dwc/pcie-designware.h +++ b/drivers/pci/controller/dwc/pcie-designware.h @@ -155,6 +155,9 @@ #define MAX_IATU_IN 256 #define MAX_IATU_OUT 256 +/* Synopsys Vendor specific data */ +#define DW_PCIE_RAS_CAP_ID 0x2 + struct pcie_port; struct dw_pcie; struct dw_pcie_ep; @@ -284,6 +287,7 @@ struct dw_pcie { u8 dw_pcie_find_capability(struct dw_pcie *pci, u8 cap); u16 dw_pcie_find_ext_capability(struct dw_pcie *pci, u8 cap); +u16 dw_pcie_find_vsec_capability(struct dw_pcie *pci, u8 vsec_cap); int dw_pcie_read(void __iomem *addr, int size, u32 *val); int dw_pcie_write(void __iomem *addr, int size, u32 val);
Add vendor specific extended configuration space capability search API using struct dw_pcie pointer for DW controllers. Signed-off-by: Shradha Todi <shradha.t@samsung.com> --- drivers/pci/controller/dwc/pcie-designware.c | 16 ++++++++++++++++ drivers/pci/controller/dwc/pcie-designware.h | 4 ++++ 2 files changed, 20 insertions(+)