diff mbox series

[5/5] drm/scheduler: deprecate drm_sched_resubmit_jobs

Message ID 20221026153557.63541-5-christian.koenig@amd.com (mailing list archive)
State New, archived
Headers show
Series [1/5] drm/amd/amdgpu revert "implement tdr advanced mode" | expand

Commit Message

Christian König Oct. 26, 2022, 3:35 p.m. UTC 
This interface is not working as it should.

Signed-off-by: Christian König <christian.koenig@amd.com>
---
 drivers/gpu/drm/scheduler/sched_main.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index bb28f31bff6f..ecd4afab4adb 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -489,10 +489,21 @@  void drm_sched_start(struct drm_gpu_scheduler *sched, bool full_recovery)
 EXPORT_SYMBOL(drm_sched_start);
 
 /**
- * drm_sched_resubmit_jobs - helper to relaunch jobs from the pending list
+ * drm_sched_resubmit_jobs - Deprecated, don't use in new code!
  *
  * @sched: scheduler instance
  *
+ * Re-submitting jobs was a concept AMD came up as cheap way to implement
+ * recovery after a job timeout.
+ *
+ * This turned out to be not working very well. First of all there are many
+ * problem with the dma_fence implementation and requirements. Either the
+ * implementation is risking deadlocks with core memory management or violating
+ * documented implementation details of the dma_fence object.
+ *
+ * Drivers can still save and restore their state for recovery operations, but
+ * we shouldn't make this a general scheduler feature around the dma_fence
+ * interface.
  */
 void drm_sched_resubmit_jobs(struct drm_gpu_scheduler *sched)
 {