linux-kernel - Re: [PATCH v9 01/16] PCI/CXL: Add pcie_is

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Message-ID: <ba7c6554-bac1-4c89-96a1-691e2bdffbc6@amd.com>
Date: Wed, 4 Jun 2025 14:18:25 -0500
From: "Bowman, Terry" <terry.bowman@....com>
To: Sathyanarayanan Kuppuswamy <sathyanarayanan.kuppuswamy@...ux.intel.com>,
 PradeepVineshReddy.Kodamati@....com, dave@...olabs.net,
 jonathan.cameron@...wei.com, dave.jiang@...el.com,
 alison.schofield@...el.com, vishal.l.verma@...el.com, ira.weiny@...el.com,
 dan.j.williams@...el.com, bhelgaas@...gle.com, bp@...en8.de,
 ming.li@...omail.com, shiju.jose@...wei.com, dan.carpenter@...aro.org,
 Smita.KoralahalliChannabasappa@....com, kobayashi.da-06@...itsu.com,
 yanfei.xu@...el.com, rrichter@....com, peterz@...radead.org, colyli@...e.de,
 uaisheng.ye@...el.com, fabio.m.de.francesco@...ux.intel.com,
 ilpo.jarvinen@...ux.intel.com, yazen.ghannam@....com,
 linux-cxl@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-pci@...r.kernel.org
Subject: Re: [PATCH v9 01/16] PCI/CXL: Add pcie_is_cxl()



On 6/4/2025 2:06 PM, Sathyanarayanan Kuppuswamy wrote:
> On 6/3/25 10:22 AM, Terry Bowman wrote:
>> CXL and AER drivers need the ability to identify CXL devices.
>>
>> Add set_pcie_cxl() with logic checking for CXL Flexbus DVSEC presence. The
>> CXL Flexbus DVSEC presence is used because it is required for all the CXL
>> PCIe devices.[1]
>>
>> Add boolean 'struct pci_dev::is_cxl' with the purpose to cache the CXL
>> Flexbus presence.
>>
>> Add function pcie_is_cxl() to return 'struct pci_dev::is_cxl'.
>>
>> [1] CXL 3.1 Spec, 8.1.1 PCIe Designated Vendor-Specific Extended
>>      Capability (DVSEC) ID Assignment, Table 8-2
>>
>> Signed-off-by: Terry Bowman <terry.bowman@....com>
>> Reviewed-by: Ira Weiny <ira.weiny@...el.com>
>> ---
> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
>
Thanks for reviewing Kuppuswamy. Terry