drm/xe/vf: Pause submissions during RESFIX fixups

While applying post-migration fixups to VF, GuC will not respond
to any commands. This means submissions have no way of finishing.

To avoid acquiring additional resources and then stalling
on hardware access, pause the submission work. This will
decrease the chance of depleting resources, and speed up
the recovery.

v2: Commented xe_irq_resume() call
v3: Typo fix

Signed-off-by: Tomasz Lis <tomasz.lis@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michal Winiarski <michal.winiarski@intel.com>
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
Link: https://lore.kernel.org/r/20250802031045.1127138-3-tomasz.lis@intel.com
Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_gpu_scheduler.c b/drivers/gpu/drm/xe/xe_gpu_scheduler.c
index 869b43a4151d..455ccaf17314 100644
--- a/drivers/gpu/drm/xe/xe_gpu_scheduler.c
+++ b/drivers/gpu/drm/xe/xe_gpu_scheduler.c
@@ -101,6 +101,19 @@ void xe_sched_submission_stop(struct xe_gpu_scheduler *sched)
 	cancel_work_sync(&sched->work_process_msg);
 }
 
+/**
+ * xe_sched_submission_stop_async - Stop further runs of submission tasks on a scheduler.
+ * @sched: the &xe_gpu_scheduler struct instance
+ *
+ * This call disables further runs of scheduling work queue. It does not wait
+ * for any in-progress runs to finish, only makes sure no further runs happen
+ * afterwards.
+ */
+void xe_sched_submission_stop_async(struct xe_gpu_scheduler *sched)
+{
+	drm_sched_wqueue_stop(&sched->base);
+}
+
 void xe_sched_submission_resume_tdr(struct xe_gpu_scheduler *sched)
 {
 	drm_sched_resume_timeout(&sched->base, sched->base.timeout);