iommu/vt-d: Add MTL to quirk list to skip TE disabling
authorAbdul Halim, Mohd Syazwan <mohd.syazwan.abdul.halim@intel.com>
Wed, 22 Nov 2023 03:26:06 +0000 (11:26 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Fri, 8 Dec 2023 07:52:19 +0000 (08:52 +0100)
commit38b3542305d05aa70bc2b5e2dfc3b66ea0349bbe
tree56b7fdcb33cf6710cc6027e0540125ab18b526d8
parentc5b09a65b4bac4e1c31ce94d3cdf5ea547ea1ff5
iommu/vt-d: Add MTL to quirk list to skip TE disabling

commit 85b80fdffa867d75dfb9084a839e7949e29064e8 upstream.

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: b1012ca8dc4f ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/iommu/intel/iommu.c