drm/xe/ggtt: invalidate engine GGTT TLBs for multi-queue GTs

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Engines cache GGTT translations in their own TLBs, which the
xe_tlb_inval_ggtt() does not touch.
After a GGTT unmap the engines can still hit the stale translation and
read the old page.

Issue an INVAL_FULL (intra vf) invalidation on GGTT unmap, gated on the
GT having any multi-queue engine class.

v2:
- Use xe_gt_has_multi_queue() helper and address nits (Niranjana)
v3:
- Invalidate both the primary and media GTs, similar to
  xe_ggtt_invalidate() (Matt Brost)
v5:
- Guard NULL gt and explain the multi-queue-only engine flush
  (Niranjana)

Assisted-by: Claude:claude-opus-4-8
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Signed-off-by: Tangudu Tilak Tirumalesh <tilak.tirumalesh.tangudu@intel.com>
Link: https://patch.msgid.link/20260827082011.3370672-4-tilak.tirumalesh.tangudu@intel.com
Signed-off-by: Shuicheng Lin <shuicheng.lin@intel.com>

...

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Tangudu Tilak Tirumalesh 2026-08-27 13:50:11 +05:30 • committed by Shuicheng Lin

parent 0f0a5aba87

commit d3f1b058a7

1 changed files with 33 additions and 1 deletions

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drivers/gpu/drm/xe/xe_ggtt.c

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