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    Subject[PATCH 5.0 085/139] PCI: Mark AMD Stoney Radeon R7 GPU ATS as broken
    Date
    From: Nikolai Kostrigin <nickel@altlinux.org>

    commit d28ca864c493637f3c957f4ed9348a94fca6de60 upstream.

    ATS is broken on the Radeon R7 GPU (at least for Stoney Ridge based laptop)
    and causes IOMMU stalls and system failure. Disable ATS on these devices
    to make them usable again with IOMMU enabled.

    Thanks to Joerg Roedel <jroedel@suse.de> for help.

    [bhelgaas: In the email thread mentioned below, Alex suspects the real
    problem is in sbios or iommu, so it may affect only certain systems, and it
    may affect other devices in those systems as well. However, per Joerg we
    lack the ability to debug further, so this quirk is the best we can do for
    now.]

    Link: https://bugzilla.kernel.org/show_bug.cgi?id=194521
    Link: https://lore.kernel.org/lkml/20190408103725.30426-1-nickel@altlinux.org
    Fixes: 9b44b0b09dec ("PCI: Mark AMD Stoney GPU ATS as broken")
    Signed-off-by: Nikolai Kostrigin <nickel@altlinux.org>
    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
    Acked-by: Joerg Roedel <jroedel@suse.de>
    CC: stable@vger.kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/pci/quirks.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/pci/quirks.c
    +++ b/drivers/pci/quirks.c
    @@ -4903,6 +4903,7 @@ static void quirk_no_ats(struct pci_dev

    /* AMD Stoney platform GPU */
    DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_no_ats);
    +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x6900, quirk_no_ats);
    #endif /* CONFIG_PCI_ATS */

    /* Freescale PCIe doesn't support MSI in RC mode */

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