| From d28ca864c493637f3c957f4ed9348a94fca6de60 Mon Sep 17 00:00:00 2001 |
| From: Nikolai Kostrigin <nickel@altlinux.org> |
| Date: Mon, 8 Apr 2019 13:37:25 +0300 |
| Subject: PCI: Mark AMD Stoney Radeon R7 GPU ATS as broken |
| |
| 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 |
| @@ -4878,6 +4878,7 @@ 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 */ |