PCI: Mark AMD Navi14 GPU rev 0xc5 ATS as broken (5e89cd30) · Commits · 戴 / test

To account for parts of the chip that are "harvested" (disabled) due to silicon flaws, caches on some AMD GPUs must be initialized before ATS is enabled. ATS is normally enabled by the IOMMU driver before the GPU driver loads, so this cache initialization would have to be done in a quirk, but that's too complex to be practical. For Navi14 (device ID 0x7340), this initialization is done by the VBIOS, but apparently some boards went to production with an older VBIOS that doesn't do it. Disable ATS for those boards. Link: https://lore.kernel.org/r/20200114205523.1054271-3-alexander.deucher@amd.com Bug: https://gitlab.freedesktop.org/drm/amd/issues/1015 See-also: ("PCI: Mark AMD Stoney Radeon R7 GPU ATS as broken") See-also: ("PCI: Mark AMD Stoney GPU ATS as broken") [bhelgaas: squash into one patch, simplify slightly, commit log] Signed-off-by:

Alex Deucher <alexander.deucher@amd.com> Signed-off-by:

Bjorn Helgaas <bhelgaas@google.com> Cc: stable@vger.kernel.org

drivers/pci/quirks.c

+13 −6

Original line number	Diff line number	Diff line
		@@ -5074,18 +5074,25 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_SERVERWORKS, 0x0422, quirk_no_ext_tags);

		#ifdef CONFIG_PCI_ATS
		/*
		* Some devices have a broken ATS implementation causing IOMMU stalls.
		* Don't use ATS for those devices.
		* Some devices require additional driver setup to enable ATS. Don't use
		* ATS for those devices as ATS will be enabled before the driver has had a
		* chance to load and configure the device.
		*/
		static void quirk_no_ats(struct pci_dev *pdev)
		static void quirk_amd_harvest_no_ats(struct pci_dev *pdev)
		{
		pci_info(pdev, "disabling ATS (broken on this device)\n");
		if (pdev->device == 0x7340 && pdev->revision != 0xc5)
		return;

		pci_info(pdev, "disabling ATS\n");
		pdev->ats_cap = 0;
		}

		/* 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);
		DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x98e4, quirk_amd_harvest_no_ats);
		/* AMD Iceland dGPU */
		DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x6900, quirk_amd_harvest_no_ats);
		/* AMD Navi14 dGPU */
		DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x7340, quirk_amd_harvest_no_ats);
		#endif /* CONFIG_PCI_ATS */

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

Admin message