[Intel-xe] [PATCH] drm/xe: Fix potential deadlock handling page faults

[Matthew Brost]

Within a class the GuC will hault scheduling if the head of the queue
can't be scheduled the queue will block. This can lead to deadlock if
BCS0-7 all have faults and another engine on BCS0-7 is at head of the
GuC scheduling queue as the migration engine used to fix tthe fault will
be blocked. To work around this set the migration engine to the highest
priority when servicing page faults.

v2 (Maarten): Set priority to kernel once at creation

Signed-off-by: Matthew Brost <matthew.brost at intel.com>
---
 drivers/gpu/drm/xe/xe_migrate.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_migrate.c b/drivers/gpu/drm/xe/xe_migrate.c
index 77a6d71f6e89..546711a0ec39 100644
--- a/drivers/gpu/drm/xe/xe_migrate.c
+++ b/drivers/gpu/drm/xe/xe_migrate.c
@@ -359,6 +359,8 @@ struct xe_migrate *xe_migrate_init(struct xe_gt *gt)
 		xe_vm_close_and_put(vm);
 		return ERR_CAST(m->eng);
 	}
+	if (xe->info.supports_usm)
+		m->eng->entity->priority = DRM_SCHED_PRIORITY_KERNEL;
 
 	mutex_init(&m->job_mutex);
 
-- 
2.34.1