linux-kernel - [PATCH] drm/panthor: assign unique names to queues

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Message-ID: <20250828200532.3534201-1-olvaffe@gmail.com>
Date: Thu, 28 Aug 2025 13:05:32 -0700
From: Chia-I Wu <olvaffe@...il.com>
To: Boris Brezillon <boris.brezillon@...labora.com>,
	Steven Price <steven.price@....com>,
	Liviu Dudau <liviu.dudau@....com>,
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
	Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>,
	David Airlie <airlied@...il.com>,
	Simona Vetter <simona@...ll.ch>,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] drm/panthor: assign unique names to queues

Userspace relies on the ring field of gpu_scheduler tracepoints to
identify a drm_gpu_scheduler.  The value of the ring field is taken from
sched->name.

Because we typically have multiple schedulers running in parallel in
each process, assign unique names to schedulers such that userspace can
distinguish them.

Signed-off-by: Chia-I Wu <olvaffe@...il.com>
---
 drivers/gpu/drm/panthor/panthor_sched.c | 32 ++++++++++++++++++-------
 1 file changed, 23 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
index ba5dc3e443d9c..26616b6cb110d 100644
--- a/drivers/gpu/drm/panthor/panthor_sched.c
+++ b/drivers/gpu/drm/panthor/panthor_sched.c
@@ -360,6 +360,9 @@ struct panthor_queue {
 	/** @entity: DRM scheduling entity used for this queue. */
 	struct drm_sched_entity entity;
 
+	/** @name: DRM scheduler name for this queue. */
+	char name[32];
+
 	/**
 	 * @remaining_time: Time remaining before the job timeout expires.
 	 *
@@ -3308,9 +3311,10 @@ static u32 calc_profiling_ringbuf_num_slots(struct panthor_device *ptdev,
 
 static struct panthor_queue *
 group_create_queue(struct panthor_group *group,
-		   const struct drm_panthor_queue_create *args)
+		   const struct drm_panthor_queue_create *args, u32 gid,
+		   u32 qid)
 {
-	const struct drm_sched_init_args sched_args = {
+	struct drm_sched_init_args sched_args = {
 		.ops = &panthor_queue_sched_ops,
 		.submit_wq = group->ptdev->scheduler->wq,
 		.num_rqs = 1,
@@ -3323,7 +3327,7 @@ group_create_queue(struct panthor_group *group,
 		.credit_limit = args->ringbuf_size / sizeof(u64),
 		.timeout = msecs_to_jiffies(JOB_TIMEOUT_MS),
 		.timeout_wq = group->ptdev->reset.wq,
-		.name = "panthor-queue",
+		.name = NULL, /* will point to queue->name */
 		.dev = group->ptdev->base.dev,
 	};
 	struct drm_gpu_scheduler *drm_sched;
@@ -3398,6 +3402,11 @@ group_create_queue(struct panthor_group *group,
 	if (ret)
 		goto err_free_queue;
 
+	/* assign a unique name */
+	snprintf(queue->name, sizeof(queue->name), "panthor-queue-%d-%d", gid,
+		 qid);
+	sched_args.name = queue->name;
+
 	ret = drm_sched_init(&queue->scheduler, &sched_args);
 	if (ret)
 		goto err_free_queue;
@@ -3540,12 +3549,18 @@ int panthor_group_create(struct panthor_file *pfile,
 	memset(group->syncobjs->kmap, 0,
 	       group_args->queues.count * sizeof(struct panthor_syncobj_64b));
 
+	ret = xa_alloc(&gpool->xa, &gid, group,
+		       XA_LIMIT(1, MAX_GROUPS_PER_POOL), GFP_KERNEL);
+	if (ret)
+		goto err_put_group;
+
 	for (i = 0; i < group_args->queues.count; i++) {
-		group->queues[i] = group_create_queue(group, &queue_args[i]);
+		group->queues[i] =
+			group_create_queue(group, &queue_args[i], gid, i);
 		if (IS_ERR(group->queues[i])) {
 			ret = PTR_ERR(group->queues[i]);
 			group->queues[i] = NULL;
-			goto err_put_group;
+			goto err_erase_gid;
 		}
 
 		group->queue_count++;
@@ -3553,10 +3568,6 @@ int panthor_group_create(struct panthor_file *pfile,
 
 	group->idle_queues = GENMASK(group->queue_count - 1, 0);
 
-	ret = xa_alloc(&gpool->xa, &gid, group, XA_LIMIT(1, MAX_GROUPS_PER_POOL), GFP_KERNEL);
-	if (ret)
-		goto err_put_group;
-
 	mutex_lock(&sched->reset.lock);
 	if (atomic_read(&sched->reset.in_progress)) {
 		panthor_group_stop(group);
@@ -3575,6 +3586,9 @@ int panthor_group_create(struct panthor_file *pfile,
 
 	return gid;
 
+err_erase_gid:
+	xa_erase(&gpool->xa, gid);
+
 err_put_group:
 	group_put(group);
 	return ret;
-- 
2.51.0.318.gd7df087d1a-goog