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>

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 5c4f5aa8e87e448e732474406f43cb9b277f3474..bd34fcc5a5274ed4fd85bf32cb4b58b3d43f51d1 100644 (file)
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4872,7 +4872,7 @@ 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))