linux-kernel - Re: [PATCH v9 04/16] PCI/AER: Dequeue forwarded CXL error

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Message-ID: <aad4372e-d73b-47f9-9736-31dc1e6e03b0@amd.com>
Date: Tue, 10 Jun 2025 13:07:58 -0500
From: "Bowman, Terry" <terry.bowman@....com>
To: Lukas Wunner <lukas@...ner.de>
Cc: 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,
 rrichter@....com, peterz@...radead.org,
 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 04/16] PCI/AER: Dequeue forwarded CXL error



On 6/9/2025 11:15 PM, Lukas Wunner wrote:
> On Tue, Jun 03, 2025 at 12:22:27PM -0500, Terry Bowman wrote:
>> --- a/drivers/cxl/core/ras.c
>> +++ b/drivers/cxl/core/ras.c
>> +static int cxl_rch_handle_error_iter(struct pci_dev *pdev, void *data)
>> +{
>> +	struct cxl_prot_error_info *err_info = data;
>> +	struct pci_dev *pdev_ref __free(pci_dev_put) = pci_dev_get(pdev);
>> +	struct cxl_dev_state *cxlds;
>> +
>> +	/*
>> +	 * The capability, status, and control fields in Device 0,
>> +	 * Function 0 DVSEC control the CXL functionality of the
>> +	 * entire device (CXL 3.0, 8.1.3).
>> +	 */
>> +	if (pdev->devfn != PCI_DEVFN(0, 0))
>> +		return 0;
>> +
>> +	/*
>> +	 * CXL Memory Devices must have the 502h class code set (CXL
>> +	 * 3.0, 8.1.12.1).
>> +	 */
>> +	if ((pdev->class >> 8) != PCI_CLASS_MEMORY_CXL)
>> +		return 0;
>> +
>> +	if (!is_cxl_memdev(&pdev->dev) || !pdev->dev.driver)
>> +		return 0;
> Is the point of the "!pdev->dev.driver" check to ascertain that
> pdev is bound to cxl_pci_driver?
>
> If so, you need to check "if (pdev->driver != &cxl_pci_driver)"
> directly (like cxl_handle_cper_event() does).
>
> That's because there are drivers which may bind to *any* PCI device,
> e.g. vfio_pci_driver.
>
> Thanks,
>
> Lukas

Good point. I'm adding this change. Thanks Lukas.

-Terry