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

[Lucas Stach <l.stach@xxxxxxxxxxxxxx>]

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@xxxxxxxxxxxxxx>
---
 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 76fd2904c7c6..24c77a6a157f 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -847,6 +847,12 @@ 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 addb135eeea6..573bef640664 100644
--- a/include/drm/gpu_scheduler.h
+++ b/include/drm/gpu_scheduler.h
@@ -196,6 +196,13 @@ struct drm_sched_entity {
 	 * drm_sched_entity_fini().
 	 */
 	struct completion		entity_idle;
+	/**
+	 * @elapsed_ns
+	 *
+	 * Records the amount of time where jobs from this entity were active
+	 * on the GPU.
+	 */
+	uint64_t elapsed_ns;
 };
 
 /**
-- 
2.30.2