drm/v3d: Implement show_fdinfo() callback for GPU usage stats

This patch exposes the accumulated amount of active time per client
through the fdinfo infrastructure. The amount of active time is exposed
for each V3D queue: BIN, RENDER, CSD, TFU and CACHE_CLEAN.

In order to calculate the amount of active time per client, a CPU clock
is used through the function local_clock(). The point where the jobs has
started is marked and is finally compared with the time that the job had
finished.

Moreover, the number of jobs submitted to each queue is also exposed on
fdinfo through the identifier "v3d-jobs-<queue>".

Co-developed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Signed-off-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Acked-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Reviewed-by: Melissa Wen <mwen@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230905213416.1290219-3-mcanal@igalia.com

1 files changed, 23 insertions, 0 deletions

diff --git a/drivers/gpu/drm/v3d/v3d_drv.h b/drivers/gpu/drm/v3d/v3d_drv.h
index 106454f28956..8f9d93239a17 100644
--- a/drivers/gpu/drm/v3d/v3d_drv.h
+++ b/drivers/gpu/drm/v3d/v3d_drv.h
@@ -21,6 +21,18 @@ struct reset_control;
 
 #define V3D_MAX_QUEUES (V3D_CACHE_CLEAN + 1)
 
+static inline char *v3d_queue_to_string(enum v3d_queue queue)
+{
+	switch (queue) {
+	case V3D_BIN: return "bin";
+	case V3D_RENDER: return "render";
+	case V3D_TFU: return "tfu";
+	case V3D_CSD: return "csd";
+	case V3D_CACHE_CLEAN: return "cache_clean";
+	}
+	return "UNKNOWN";
+}
+
 struct v3d_queue_state {
 	struct drm_gpu_scheduler sched;
 
@@ -167,6 +179,12 @@ struct v3d_file_priv {
 	} perfmon;
 
 	struct drm_sched_entity sched_entity[V3D_MAX_QUEUES];
+
+	u64 start_ns[V3D_MAX_QUEUES];
+
+	u64 enabled_ns[V3D_MAX_QUEUES];
+
+	u64 jobs_sent[V3D_MAX_QUEUES];
 };
 
 struct v3d_bo {
@@ -238,6 +256,11 @@ struct v3d_job {
 	 */
 	struct v3d_perfmon *perfmon;
 
+	/* File descriptor of the process that submitted the job that could be used
+	 * for collecting stats by process of GPU usage.
+	 */
+	struct drm_file *file;
+
 	/* Callback for the freeing of the job on refcount going to 0. */
 	void (*free)(struct kref *ref);
 };