Skip to content

Commit

Permalink
iommu/vt-d: Add MTL to quirk list to skip TE disabling
Browse files Browse the repository at this point in the history
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>
  • Loading branch information
Abdul Halim, Mohd Syazwan authored and Joerg Roedel committed Nov 27, 2023
1 parent 9a16ab9 commit 85b80fd
Showing 1 changed file with 1 addition and 1 deletion.
2 changes: 1 addition & 1 deletion drivers/iommu/intel/iommu.c
Original file line number Diff line number Diff line change
Expand Up @@ -5077,7 +5077,7 @@ static void quirk_igfx_skip_te_disable(struct pci_dev *dev)
ver = (dev->device >> 8) & 0xff;
if (ver != 0x45 && ver != 0x46 && ver != 0x4c &&
ver != 0x4e && ver != 0x8a && ver != 0x98 &&
ver != 0x9a && ver != 0xa7)
ver != 0x9a && ver != 0xa7 && ver != 0x7d)
return;

if (risky_device(dev))
Expand Down

0 comments on commit 85b80fd

Please sign in to comment.