[PATCH 3/3] drm/i915: Inherit submitter nice when scheduling requests

[Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Inherit submitter nice at point of request submission to account for
long running processes getting either externally or self re-niced.

Nice value will only apply to requests which originate from user
contexts and have default context priority.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/i915_request.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 960bfd517ff7..a777f14e4b87 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1811,8 +1811,11 @@ void i915_request_add(struct i915_request *rq)
 	/* XXX placeholder for selftests */
 	rcu_read_lock();
 	ctx = rcu_dereference(rq->context->gem_context);
-	if (ctx)
+	if (ctx) {
 		attr = ctx->sched;
+		if (attr.priority == I915_CONTEXT_DEFAULT_PRIORITY)
+			attr.nice = task_nice(current);
+	}
 	rcu_read_unlock();
 
 	__i915_request_queue(rq, &attr);
-- 
2.32.0