From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 9248E30AAB1 for ; Wed, 3 Sep 2025 14:22:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756909329; cv=none; b=qp+YyovCD/1Se82GdNG6lEAc1URomw7wijMaYkYZBeWHlA3+75ygc2ste9rVEIu3/q7y7NEg4mHV0xO3pFNwJJQeLWHaJqeqreZNCQrOqViYKrRDPOCUfIsx7CGUh/o6sQLzWxyztjodcKVKIuqplZ0iSj4PVNyPWVANu2qMoSo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756909329; c=relaxed/simple; bh=aUWpzOrvx139Rt8Fui2ojZOBOPSmcCsv0ILAtqm2plw=; h=Message-ID:Date:MIME-Version:Subject:To:References:From: In-Reply-To:Content-Type; b=bCZv9ppCtOVtFTthfeaR174ZdGbhrX26JK6I8nd5ozJfQr2CV/xZJ2JukKFGzwELqRIsue2os+Fydku191pSruMqT2gIIb/dngAYOXNj66CJINjmnqPXbTGCVCaSZMVogXMUOLq8T5bVVaOpD7usm5WKl3g1QTcHwHXftZjIHlY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7515714BF; Wed, 3 Sep 2025 07:21:57 -0700 (PDT) Received: from [10.1.39.32] (e122027.cambridge.arm.com [10.1.39.32]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id D969B3F6A8; Wed, 3 Sep 2025 07:22:03 -0700 (PDT) Message-ID: <1ecc0221-ad51-49e9-b2a5-87e0675c5c10@arm.com> Date: Wed, 3 Sep 2025 15:22:01 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] drm/panthor: assign unique names to queues To: Chia-I Wu , Boris Brezillon , Liviu Dudau , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20250902200624.428175-1-olvaffe@gmail.com> From: Steven Price Content-Language: en-GB In-Reply-To: <20250902200624.428175-1-olvaffe@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 02/09/2025 21:06, Chia-I Wu wrote: > 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 Reviewed-by: Steven Price > > --- > > v2: > - include drm_client_id in the name to be truly unique > - remove unnecessary NULL in drm_sched_init_args initialization > - reformat to column width 100 > > v3: > - switch to kasprintf for queue name > - open to alternatives such as name[48], shorter prefix (e.g., > panthor-q), etc. > --- > drivers/gpu/drm/panthor/panthor_drv.c | 2 +- > drivers/gpu/drm/panthor/panthor_sched.c | 38 ++++++++++++++++++------- > drivers/gpu/drm/panthor/panthor_sched.h | 3 +- > 3 files changed, 31 insertions(+), 12 deletions(-) > > diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c > index 9256806eb6623..be962b1387f03 100644 > --- a/drivers/gpu/drm/panthor/panthor_drv.c > +++ b/drivers/gpu/drm/panthor/panthor_drv.c > @@ -1105,7 +1105,7 @@ static int panthor_ioctl_group_create(struct drm_device *ddev, void *data, > if (ret) > goto out; > > - ret = panthor_group_create(pfile, args, queue_args); > + ret = panthor_group_create(pfile, args, queue_args, file->client_id); > if (ret < 0) > goto out; > args->group_handle = ret; > diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c > index ba5dc3e443d9c..b328631c00489 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; > + > /** > * @remaining_time: Time remaining before the job timeout expires. > * > @@ -901,6 +904,8 @@ static void group_free_queue(struct panthor_group *group, struct panthor_queue * > if (queue->scheduler.ops) > drm_sched_fini(&queue->scheduler); > > + kfree(queue->name); > + > panthor_queue_put_syncwait_obj(queue); > > panthor_kernel_bo_destroy(queue->ringbuf); > @@ -3308,9 +3313,10 @@ 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, > + u64 drm_client_id, 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 +3329,6 @@ 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", > .dev = group->ptdev->base.dev, > }; > struct drm_gpu_scheduler *drm_sched; > @@ -3398,6 +3403,15 @@ group_create_queue(struct panthor_group *group, > if (ret) > goto err_free_queue; > > + /* assign a unique name */ > + queue->name = kasprintf(GFP_KERNEL, "panthor-queue-%llu-%u-%u", drm_client_id, gid, qid); > + if (!queue->name) { > + ret = -ENOMEM; > + goto err_free_queue; > + } > + > + sched_args.name = queue->name; > + > ret = drm_sched_init(&queue->scheduler, &sched_args); > if (ret) > goto err_free_queue; > @@ -3447,7 +3461,8 @@ static void add_group_kbo_sizes(struct panthor_device *ptdev, > > int panthor_group_create(struct panthor_file *pfile, > const struct drm_panthor_group_create *group_args, > - const struct drm_panthor_queue_create *queue_args) > + const struct drm_panthor_queue_create *queue_args, > + u64 drm_client_id) > { > struct panthor_device *ptdev = pfile->ptdev; > struct panthor_group_pool *gpool = pfile->groups; > @@ -3540,12 +3555,16 @@ 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], drm_client_id, 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 +3572,6 @@ 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 +3590,9 @@ 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; > diff --git a/drivers/gpu/drm/panthor/panthor_sched.h b/drivers/gpu/drm/panthor/panthor_sched.h > index 742b0b4ff3a3c..f4a475aa34c0a 100644 > --- a/drivers/gpu/drm/panthor/panthor_sched.h > +++ b/drivers/gpu/drm/panthor/panthor_sched.h > @@ -21,7 +21,8 @@ struct panthor_job; > > int panthor_group_create(struct panthor_file *pfile, > const struct drm_panthor_group_create *group_args, > - const struct drm_panthor_queue_create *queue_args); > + const struct drm_panthor_queue_create *queue_args, > + u64 drm_client_id); > int panthor_group_destroy(struct panthor_file *pfile, u32 group_handle); > int panthor_group_get_state(struct panthor_file *pfile, > struct drm_panthor_group_get_state *get_state);