From 90521df5fc43980e4575bd8c5b1cb62afe1a9f5f Mon Sep 17 00:00:00 2001
From: Matthew Brost <matthew.brost@intel.com>
Date: Wed, 2 Oct 2024 17:16:56 -0700
Subject: [PATCH] drm/xe: Take job list lock in xe_sched_add_pending_job
A fragile micro optimization in xe_sched_add_pending_job relied on both
the GPU scheduler being stopped and fence signaling stopped to safely
add a job to the pending list without the job list lock in
xe_sched_add_pending_job. Remove this optimization and just take the job
list lock.
Fixes: 7ddb9403dd74 ("drm/xe: Sample ctx timestamp to determine if jobs have timed out")
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241003001657.3517883-2-matthew.brost@intel.com
---
drivers/gpu/drm/xe/xe_gpu_scheduler.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/xe/xe_gpu_scheduler.h b/drivers/gpu/drm/xe/xe_gpu_scheduler.h
index 5ad5629a6c604..64b2ae6839db2 100644
--- a/drivers/gpu/drm/xe/xe_gpu_scheduler.h
+++ b/drivers/gpu/drm/xe/xe_gpu_scheduler.h
@@ -63,7 +63,9 @@ xe_sched_invalidate_job(struct xe_sched_job *job, int threshold)
static inline void xe_sched_add_pending_job(struct xe_gpu_scheduler *sched,
struct xe_sched_job *job)
{
+ spin_lock(&sched->base.job_list_lock);
list_add(&job->drm.list, &sched->base.pending_list);
+ spin_unlock(&sched->base.job_list_lock);
}
static inline
--
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