48 lines
1.7 KiB
Diff
48 lines
1.7 KiB
Diff
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From 9b44b0b09decfbe388131a345ba780c57240a7a9 Mon Sep 17 00:00:00 2001
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From: Joerg Roedel <jroedel@suse.de>
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Date: Tue, 11 Jul 2017 15:48:00 -0500
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Subject: PCI: Mark AMD Stoney GPU ATS as broken
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ATS is broken on this hardware and causes IOMMU stalls and system failure.
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Disable ATS on these devices to make them usable again with IOMMU enabled.
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Note that the commit in the Fixes tag is not buggy; it just uncovers the
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problem in the hardware by increasing the ATS flush rate.
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Link: https://lists.linuxfoundation.org/pipermail/iommu/2017-March/020836.html
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Link: https://bugzilla.redhat.com/show_bug.cgi?id=1409201
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Fixes: b1516a14657a ("iommu/amd: Implement flush queue")
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Signed-off-by: Joerg Roedel <jroedel@suse.de>
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Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
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Acked-by: Alex Deucher <alexander.deucher@amd.com>
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---
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drivers/pci/quirks.c | 15 +++++++++++++++
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1 file changed, 15 insertions(+)
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diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
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index 6967c6b..15ee4e9 100644
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--- a/drivers/pci/quirks.c
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+++ b/drivers/pci/quirks.c
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@@ -4681,3 +4681,18 @@ static void quirk_intel_no_flr(struct pci_dev *dev)
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}
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DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1502, quirk_intel_no_flr);
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DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_INTEL, 0x1503, quirk_intel_no_flr);
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+
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+#ifdef CONFIG_PCI_ATS
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+/*
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+ * Some devices have a broken ATS implementation causing IOMMU stalls.
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+ * Don't use ATS for those devices.
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+ */
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+static void quirk_no_ats(struct pci_dev *pdev)
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+{
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+ dev_info(&pdev->dev, "disabling ATS (broken on this device)\n");
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+ pdev->ats_cap = 0;
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+}
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+
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+/* AMD Stoney platform GPU */
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+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_no_ats);
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+#endif /* CONFIG_PCI_ATS */
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--
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cgit v1.1
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