[PATCH] drm/xe/guc/tlb: Flush g2h worker in case of tlb timeout

[Nirmoy Das]

Flush the g2h worker explicitly if TLB timeout happens which is
observed on LNL and that points recent scheduling issue with E-cores.
This is similar to the recent fix:
commit e51527233804 ("drm/xe/guc/ct: Flush g2h worker in case of g2h
response timeout") and should be removed once there is E core
scheduling fix.

Link: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/2687
Cc: Badal Nilawar <badal.nilawar at intel.com>
Cc: Matthew Brost <matthew.brost at intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: John Harrison <John.C.Harrison at Intel.com>
Cc: Himal Prasad Ghimiray <himal.prasad.ghimiray at intel.com>
Cc: Lucas De Marchi <lucas.demarchi at intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
---
 drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
index 773de1f08db9..2c327dccbd74 100644
--- a/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
+++ b/drivers/gpu/drm/xe/xe_gt_tlb_invalidation.c
@@ -72,6 +72,15 @@ static void xe_gt_tlb_fence_timeout(struct work_struct *work)
 	struct xe_device *xe = gt_to_xe(gt);
 	struct xe_gt_tlb_invalidation_fence *fence, *next;
 
+	/*
+	 * This is analogous to e51527233804 ("drm/xe/guc/ct: Flush g2h worker
+	 * in case of g2h response timeout")
+	 *
+	 * TODO: Drop this change once workqueue scheduling delay issue is
+	 * fixed on LNL Hybrid CPU.
+	 */
+	flush_work(&gt->uc.guc.ct.g2h_worker);
+
 	spin_lock_irq(&gt->tlb_invalidation.pending_lock);
 	list_for_each_entry_safe(fence, next,
 				 &gt->tlb_invalidation.pending_fences, link) {
-- 
2.46.0