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SubjectRe: [PATCH V2 01/16] PCI: Add #defines for PCIe spec r4.0 features
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On 4/11/2019 3:43 PM, Thierry Reding wrote:
> On Fri, Apr 05, 2019 at 01:24:28AM +0530, Vidya Sagar wrote:
>> Add #defines for the Data Link Feature and Physical Layer 16.0 GT/s
>> features.
>>
>> Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
>> ---
>> Changes from [v1]:
>> * None
>>
>> include/uapi/linux/pci_regs.h | 22 +++++++++++++++++++++-
>> 1 file changed, 21 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
>> index 5c98133f2c94..3e01b55d548d 100644
>> --- a/include/uapi/linux/pci_regs.h
>> +++ b/include/uapi/linux/pci_regs.h
>> @@ -705,7 +705,9 @@
>> #define PCI_EXT_CAP_ID_DPC 0x1D /* Downstream Port Containment */
>> #define PCI_EXT_CAP_ID_L1SS 0x1E /* L1 PM Substates */
>> #define PCI_EXT_CAP_ID_PTM 0x1F /* Precision Time Measurement */
>> -#define PCI_EXT_CAP_ID_MAX PCI_EXT_CAP_ID_PTM
>> +#define PCI_EXT_CAP_ID_DLF 0x25 /* Data Link Feature */
>> +#define PCI_EXT_CAP_ID_PL 0x26 /* Physical Layer 16.0 GT/s */
>> +#define PCI_EXT_CAP_ID_MAX PCI_EXT_CAP_ID_PL
>>
>> #define PCI_EXT_CAP_DSN_SIZEOF 12
>> #define PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF 40
>> @@ -1045,4 +1047,22 @@
>> #define PCI_L1SS_CTL1_LTR_L12_TH_SCALE 0xe0000000 /* LTR_L1.2_THRESHOLD_Scale */
>> #define PCI_L1SS_CTL2 0x0c /* Control 2 Register */
>>
>> +/* Data Link Feature */
>> +#define PCI_DLF_CAP 0x04 /* Capabilities Register */
>> +#define PCI_DLF_LOCAL_DLF_SUP_MASK 0x007fffff /* Local Data Link Feature Supported */
>> +#define PCI_DLF_EXCHANGE_ENABLE 0x80000000 /* Data Link Feature Exchange Enable */
>> +#define PCI_DLF_STS 0x08 /* Status Register */
>> +#define PCI_DLF_REMOTE_DLF_SUP_MASK 0x007fffff /* Remote Data Link Feature Supported */
>> +#define PCI_DLF_REMOTE_DLF_SUP_VALID 0x80000000 /* Remote Data Link Feature Support Valid */
>> +
>> +/* Physical Layer 16.0 GT/s */
>> +#define PCI_PL_16GT_CAP 0x04 /* Capabilities Register */
>> +#define PCI_PL_16GT_CTRL 0x08 /* Control Register */
>> +#define PCI_PL_16GT_STS 0x0c /* Status Register */
>> +#define PCI_PL_16GT_LDPM_STS 0x10 /* Local Data Parity Mismatch Status Register */
>> +#define PCI_PL_16GT_FRDPM_STS 0x14 /* First Retimer Data Parity Mismatch Status Register */
>> +#define PCI_PL_16GT_SRDPM_STS 0x18 /* Second Retimer Data Parity Mismatch Status Register */
>> +#define PCI_PL_16GT_RSVD 0x1C /* Reserved */
>> +#define PCI_PL_16GT_LE_CTRL 0x20 /* Lane Equalization Control Register */
>
> This looks correct comparing to the specification. However, this leaves
> out some definitions, so I'm wondering if perhaps this should include
> all field definitions. There are also extended capabilities between the
> current maximum 0x1F and 0x25. Perhaps those should be added as well. I
> guess this could always be done as a follow-up.
>
> Perhaps it'd be better to change the subject to more accurately reflect
> that you're only adding a couple of PCIe 4.0 features.
I'll change subject accordingly.

>
> Other than that:
>
> Reviewed-by: Thierry Reding <treding@nvidia.com>
>

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