On Mon, Feb 19, 2024 at 02:28:11PM +0100, Jörg Wedekind wrote:
> Per PCIe r3.1, sec 2.2.6.2 and 7.8.4, a Requester may not use 8-bit Tags
> unless its Extended Tag Field Enable is set, but all Receivers/Completers
> must handle 8-bit Tags correctly regardless of their Extended Tag Field
> Enable.
>
> Some devices do not handle 8-bit Tags as Completers, so add a quirk for
> them. If we find such a device, we disable Extended Tags for the entire
> hierarchy to make peer-to-peer DMA possible.
>
> The 3ware 9650SE seems to have issues with handling 8-bit tags. Mark it
> as broken.
>
> This fixes PCI Partiy Errors like :
>
> 3w-9xxx: scsi0: ERROR: (0x06:0x000C): PCI Parity Error: clearing.
> 3w-9xxx: scsi0: ERROR: (0x06:0x000D): PCI Abort: clearing.
> 3w-9xxx: scsi0: ERROR: (0x06:0x000E): Controller Queue Error: clearing.
> 3w-9xxx: scsi0: ERROR: (0x06:0x0010): Microcontroller Error: clearing.
>
> Fixes: 60db3a4d8cc9 ("PCI: Enable PCIe Extended Tags if supported")
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=202425
> Signed-off-by: Jörg Wedekind <joerg@xxxxxxxxxxx>
Applied to pci/enumeration for v6.9, thanks!
> ---
> drivers/pci/quirks.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
> index d797df6e5f3e..2ebbe51a7efe 100644
> --- a/drivers/pci/quirks.c
> +++ b/drivers/pci/quirks.c
> @@ -5527,6 +5527,7 @@ static void quirk_no_ext_tags(struct pci_dev *pdev)
>
> pci_walk_bus(bridge->bus, pci_configure_extended_tags, NULL);
> }
> +DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_3WARE, 0x1004, quirk_no_ext_tags);
> DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, 0x0132, quirk_no_ext_tags);
> DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, 0x0140, quirk_no_ext_tags);
> DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, 0x0141, quirk_no_ext_tags);
> --
> 2.35.3
>
