linux-kernel - Re: [PATCH V3 1/3] PCI: Add defines for Designated Vendor-Specific Capability

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Date:   Thu, 16 Jul 2020 10:18:33 -0700
From:   Alexander Duyck <alexander.h.duyck@...ux.intel.com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        "David E. Box" <david.e.box@...ux.intel.com>, lee.jones@...aro.org,
        dvhart@...radead.org, andy@...radead.org, bhelgaas@...gle.com
Cc:     linux-kernel@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH V3 1/3] PCI: Add defines for Designated Vendor-Specific
 Capability



On 7/15/2020 7:55 PM, Randy Dunlap wrote:
> On 7/13/20 11:23 PM, David E. Box wrote:
>> Add PCIe DVSEC extended capability ID and defines for the header offsets.
>> Defined in PCIe r5.0, sec 7.9.6.
>>
>> Signed-off-by: David E. Box <david.e.box@...ux.intel.com>
>> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
>> ---
>>   include/uapi/linux/pci_regs.h | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
>> index f9701410d3b5..09daa9f07b6b 100644
>> --- a/include/uapi/linux/pci_regs.h
>> +++ b/include/uapi/linux/pci_regs.h
>> @@ -720,6 +720,7 @@
>> +#define PCI_EXT_CAP_ID_DVSEC	0x23	/* Designated Vendor-Specific */
>> @@ -1062,6 +1063,10 @@
>> +/* Designated Vendor-Specific (DVSEC, PCI_EXT_CAP_ID_DVSEC) */
>> +#define PCI_DVSEC_HEADER1		0x4 /* Vendor-Specific Header1 */
>> +#define PCI_DVSEC_HEADER2		0x8 /* Vendor-Specific Header2 */
> 
> Just a little comment: It would make more sense to me to
> s/DVSEC/DVSPEC/g.
> 
> But then I don't have the PCIe documentation.

Arguably some of the confusion might be from the patch title. DVSEC is 
acronym for Designated Vendor-Specific Extended Capability if I recall 
correctly. It would probably be best to call that out since the extended 
implies it lives in the config space accessible via the memory mapped 
config.