This is a note to let you know that I've just added the patch titled
iommu/vt-d: Enable PCI ACS for platform opt in hint
to the 5.7-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-enable-pci-acs-for-platform-opt-in-hint.patch
and it can be found in the queue-5.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b98ee6e0b9cd95f3e6de2f54c80e0ed872b78df9
Author: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Date: Tue Jun 23 07:13:43 2020 +0800
iommu/vt-d: Enable PCI ACS for platform opt in hint
[ Upstream commit 50310600ebda74b9988467e2e6128711c7ba56fc ]
PCI ACS is disabled if Intel IOMMU is off by default or intel_iommu=off
is used in command line. Unfortunately, Intel IOMMU will be forced on if
there're devices sitting on an external facing PCI port that is marked
as untrusted (for example, thunderbolt peripherals). That means, PCI ACS
is disabled while Intel IOMMU is forced on to isolate those devices. As
the result, the devices of an MFD will be grouped by a single group even
the ACS is supported on device.
[ 0.691263] pci 0000:00:07.1: Adding to iommu group 3
[ 0.691277] pci 0000:00:07.2: Adding to iommu group 3
[ 0.691292] pci 0000:00:07.3: Adding to iommu group 3
Fix it by requesting PCI ACS when Intel IOMMU is detected with platform
opt in hint.
Fixes: 89a6079df791a ("iommu/vt-d: Force IOMMU on for platform opt in hint")
Co-developed-by: Lalithambika Krishnakumar <lalithambika.krishnakumar@xxxxxxxxx>
Signed-off-by: Lalithambika Krishnakumar <lalithambika.krishnakumar@xxxxxxxxx>
Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
Reviewed-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Cc: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx>
Cc: Ashok Raj <ashok.raj@xxxxxxxxx>
Link: https://lore.kernel.org/r/20200622231345.29722-5-baolu.lu@xxxxxxxxxxxxxxx
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c
index f77dae7ba7d40..7df5621bba8de 100644
--- a/drivers/iommu/dmar.c
+++ b/drivers/iommu/dmar.c
@@ -898,7 +898,8 @@ int __init detect_intel_iommu(void)
if (!ret)
ret = dmar_walk_dmar_table((struct acpi_table_dmar *)dmar_tbl,
&validate_drhd_cb);
- if (!ret && !no_iommu && !iommu_detected && !dmar_disabled) {
+ if (!ret && !no_iommu && !iommu_detected &&
+ (!dmar_disabled || dmar_platform_optin())) {
iommu_detected = 1;
/* Make sure ACS will be enabled */
pci_request_acs();
