[PATCH v3 1/3] drm/scheduler: track GPU active time per entity

[Lucas Stach]

Track the accumulated time that jobs from this entity were active
on the GPU. This allows drivers using the scheduler to trivially
implement the DRM fdinfo when the hardware doesn't provide more
specific information than signalling job completion anyways.

Signed-off-by: Lucas Stach <l.stach at pengutronix.de>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky at amd.com>
---
 drivers/gpu/drm/scheduler/sched_main.c | 6 ++++++
 include/drm/gpu_scheduler.h            | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index 31f3a1267be4..cc5e77a30a66 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -895,6 +895,12 @@ drm_sched_get_cleanup_job(struct drm_gpu_scheduler *sched)
 
 	spin_unlock(&sched->job_list_lock);
 
+	if (job) {
+		job->entity->elapsed_ns += ktime_to_ns(
+			ktime_sub(job->s_fence->finished.timestamp,
+				  job->s_fence->scheduled.timestamp));
+	}
+
 	return job;
 }
 
diff --git a/include/drm/gpu_scheduler.h b/include/drm/gpu_scheduler.h
index ca857ec9e7eb..f88a3fc14fb1 100644
--- a/include/drm/gpu_scheduler.h
+++ b/include/drm/gpu_scheduler.h
@@ -228,6 +228,13 @@ struct drm_sched_entity {
 	 */
 	struct rb_node			rb_tree_node;
 
+	/**
+	 * @elapsed_ns
+	 *
+	 * Records the amount of time where jobs from this entity were active
+	 * on the GPU.
+	 */
+	uint64_t elapsed_ns;
 };
 
 /**
-- 
2.39.1