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drm/xe/xe_guc_submit: Fix exec queue stop race condition

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[ Upstream commit 1564d411e1 ]

Reorder the xe_sched_tdr_queue_imm and set_exec_queue_banned calls in
guc_exec_queue_stop.  This prevents a possible race condition between
the two events in which it's possible for xe_sched_tdr_queue_imm to
wake the ufence waiter before the exec queue is banned, causing the
ufence waiter to miss the banned state.

Suggested-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Stuart Summers <stuart.summers@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240510194540.3246991-1-jonathan.cavitt@intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jonathan Cavitt
2024-08-14 15:34:13 +02:00
committed by Greg Kroah-Hartman
parent 4c59fc86bf
commit 4d4604ebf8
1 changed files with 1 additions and 1 deletions
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drivers/gpu/drm/xe/xe_guc_submit.c
+1 -1
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@@ -1429,8 +1429,8 @@ static void guc_exec_queue_stop(struct xe_guc *guc, struct xe_exec_queue *q)
!xe_sched_job_completed(job)) ||
xe_sched_invalidate_job(job, 2)) {
trace_xe_sched_job_ban(job);
xe_sched_tdr_queue_imm(&q->guc->sched);
set_exec_queue_banned(q);
xe_sched_tdr_queue_imm(&q->guc->sched);
}
}
}