linux-kernel - Re: [PATCH v3] PCI: Declare quirk_huawei_pcie_sva() as pci_fixup

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Message-ID: <CABQgh9H3POdKGsphA42C+i2_z9xCHHfSm4ULkMVmFyKBm9bWtA@mail.gmail.com>
Date: Thu, 20 Mar 2025 22:07:52 +0800
From: Zhangfei Gao <zhangfei.gao@...aro.org>
To: Bjorn Helgaas <bhelgaas@...gle.com>, Baolu Lu <baolu.lu@...ux.intel.com>, 
	Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>, Jason Gunthorpe <jgg@...pe.ca>, 
	Krzysztof Wilczyński <kwilczynski@...nel.org>
Cc: iommu@...ts.linux.dev, linux-pci@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] PCI: Declare quirk_huawei_pcie_sva() as pci_fixup_header

Hi, Joerg

On Mon, 17 Mar 2025 at 09:14, Zhangfei Gao <zhangfei.gao@...aro.org> wrote:
>
> The commit bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper
> probe path") fixed the iommu_probe_device() flow to correctly initialize
> firmware operations, allowing arm_smmu_probe_device() to be invoked
> earlier. This changes the invocation timing of arm_smmu_probe_device
> from the final fixup phase to the header fixup phase.
>
> pci_iov_add_virtfn
>     pci_device_add
>       pci_fixup_device(pci_fixup_header)      <--
>       device_add
>         bus_notify
>           iommu_bus_notifier
>   +         iommu_probe_device
>   +           arm_smmu_probe_device
>     pci_bus_add_device
>       pci_fixup_device(pci_fixup_final)       <--
>       device_attach
>         driver_probe_device
>           really_probe
>             pci_dma_configure
>               acpi_dma_configure_id
>   -             iommu_probe_device
>   -               arm_smmu_probe_device
>
> This is the pci_iov_add_virtfn().  The non-SR-IOV case is similar in
> that pci_device_add() is called from pci_scan_single_device() in the
> generic enumeration path, and pci_bus_add_device() is called later,
> after all a host bridge has been enumerated.
>
> Declare the fixup as pci_fixup_header to ensure the configuration
> happens before arm_smmu_probe_device.
>
> Fixes: bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper probe path")
> Signed-off-by: Zhangfei Gao <zhangfei.gao@...aro.org>
> Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

Would you mind take a look at this patch

Bjorn suggested
"I think there's some value in keeping fixes close to whatever needs to
be fixed, so since bcb81ac6ae3c came via the iommu tree, I would tend
to merge the fix the same way."

Thanks


> ---
> v3: modify commit msg, add Acked-by
> v2: modify commit msg
>
>  drivers/pci/quirks.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index f840d611c450..a9759889ff5e 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -1991,12 +1991,12 @@ static void quirk_huawei_pcie_sva(struct pci_dev *pdev)
>             device_create_managed_software_node(&pdev->dev, properties, NULL))
>                 pci_warn(pdev, "could not add stall property");
>  }
> -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa250, quirk_huawei_pcie_sva);
> -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa251, quirk_huawei_pcie_sva);
> -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa255, quirk_huawei_pcie_sva);
> -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa256, quirk_huawei_pcie_sva);
> -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa258, quirk_huawei_pcie_sva);
> -DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_HUAWEI, 0xa259, quirk_huawei_pcie_sva);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HUAWEI, 0xa250, quirk_huawei_pcie_sva);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HUAWEI, 0xa251, quirk_huawei_pcie_sva);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HUAWEI, 0xa255, quirk_huawei_pcie_sva);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HUAWEI, 0xa256, quirk_huawei_pcie_sva);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HUAWEI, 0xa258, quirk_huawei_pcie_sva);
> +DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_HUAWEI, 0xa259, quirk_huawei_pcie_sva);
>
>  /*
>   * It's possible for the MSI to get corrupted if SHPC and ACPI are used
> --
> 2.25.1
>