iommu/vt-d: Add RPLS to quirk list to skip TE disabling
authorTejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
Wed, 2 Mar 2022 04:32:56 +0000 (10:02 +0530)
committerRodrigo Vivi <rodrigo.vivi@intel.com>
Wed, 2 Mar 2022 22:06:30 +0000 (17:06 -0500)
commit0a967f5bfd9134b89681cae58deb222e20840e76
tree2913f3b6c07e5d58ec711e8a0dee6f83d483daf3
parentf79a568add12affc44152455fd7f7502aeea8e31
iommu/vt-d: Add RPLS to quirk list to skip TE disabling

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 completing the translation enable
command 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_translati
on(), waiting for the completion of TE transition.

This adds RPLS to a quirk list for those devices and skips
TE disabling if the qurik hits.

Link: https://gitlab.freedesktop.org/drm/intel/-/issues/4898
Tested-by: Raviteja Goud Talla <ravitejax.goud.talla@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220302043256.191529-1-tejaskumarx.surendrakumar.upadhyay@intel.com
drivers/iommu/intel/iommu.c