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iommu/vt-d: Add MTL to quirk list to skip TE disabling
jira LE-1907 Rebuild_History Non-Buildable kernel-5.14.0-427.18.1.el9_4 commit-author Abdul Halim, Mohd Syazwan <mohd.syazwan.abdul.halim@intel.com> commit 85b80fd The VT-d spec requires (10.4.4 Global Command Register, TE field) that: Hardware implementations supporting DMA draining must drain any in-flight DMA read/write requests queued within the Root-Complex before switching address translation on or off and reflecting the status of the command through the TES field in the Global Status register. Unfortunately, some integrated graphic devices fail to do so after some kind of power state transition. As the result, the system might stuck in iommu_disable_translation(), waiting for the completion of TE transition. Add MTL to the quirk list for those devices and skips TE disabling if the qurik hits. Fixes: b1012ca ("iommu/vt-d: Skip TE disabling on quirky gfx dedicated iommu") Cc: stable@vger.kernel.org Signed-off-by: Abdul Halim, Mohd Syazwan <mohd.syazwan.abdul.halim@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Link: https://lore.kernel.org/r/20231116022324.30120-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de> (cherry picked from commit 85b80fd) Signed-off-by: Jonathan Maple <jmaple@ciq.com>
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drivers/iommu/intel/iommu.c

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4929,7 +4929,7 @@ static void quirk_igfx_skip_te_disable(struct pci_dev *dev)
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ver = (dev->device >> 8) & 0xff;
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if (ver != 0x45 && ver != 0x46 && ver != 0x4c &&
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ver != 0x4e && ver != 0x8a && ver != 0x98 &&
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ver != 0x9a && ver != 0xa7)
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ver != 0x9a && ver != 0xa7 && ver != 0x7d)
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return;
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if (risky_device(dev))

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