This is a note to let you know that I've just added the patch titled
iommu/vt-d: Add MTL to quirk list to skip TE disabling
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iommu-vt-d-add-mtl-to-quirk-list-to-skip-te-disabling.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 85b80fdffa867d75dfb9084a839e7949e29064e8 Mon Sep 17 00:00:00 2001
From: "Abdul Halim, Mohd Syazwan" <mohd.syazwan.abdul.halim@xxxxxxxxx>
Date: Wed, 22 Nov 2023 11:26:06 +0800
Subject: iommu/vt-d: Add MTL to quirk list to skip TE disabling
From: Abdul Halim, Mohd Syazwan <mohd.syazwan.abdul.halim@xxxxxxxxx>
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@xxxxxxxxxxxxxxx
Signed-off-by: Abdul Halim, Mohd Syazwan <mohd.syazwan.abdul.halim@xxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231116022324.30120-1-baolu.lu@xxxxxxxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iommu/intel/iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -5749,7 +5749,7 @@ static void quirk_igfx_skip_te_disable(s
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))
Patches currently in stable-queue which might be from mohd.syazwan.abdul.halim@xxxxxxxxx are
queue-5.15/iommu-vt-d-add-mtl-to-quirk-list-to-skip-te-disabling.patch
