linux-kernel - Re: [PATCH] drm/panfrost: Name scheduler queues after their job slots

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Message-ID: <5f095b02-2561-49d7-88a9-0fd82a1c9e00@arm.com>
Date: Wed, 8 Oct 2025 15:48:12 +0100
From: Steven Price <steven.price@....com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>,
 linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org,
 Boris Brezillon <boris.brezillon@...labora.com>, kernel@...labora.com,
 Rob Herring <robh@...nel.org>,
 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>
Subject: Re: [PATCH] drm/panfrost: Name scheduler queues after their job slots

On 02/10/2025 18:11, Adrián Larumbe wrote:
> Drawing from commit d2624d90a0b7 ("drm/panthor: assign unique names to
> queues"), give scheduler queues proper names that reflect the function
> of their JM slot, so that this will be shown when gathering DRM
> scheduler tracepoints.
> 
> Signed-off-by: Adrián Larumbe <adrian.larumbe@...labora.com>

Two minor things below, but with those fixed:

Reviewed-by: Steven Price <steven.price@....com>

> ---
>  drivers/gpu/drm/panfrost/panfrost_drv.c | 6 ------
>  drivers/gpu/drm/panfrost/panfrost_job.c | 6 +++++-
>  drivers/gpu/drm/panfrost/panfrost_job.h | 2 ++
>  3 files changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
> index 22350ce8a08f..d08c87bc63a2 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_drv.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
> @@ -668,12 +668,6 @@ static void panfrost_gpu_show_fdinfo(struct panfrost_device *pfdev,
>  	 *   job spent on the GPU.
>  	 */
>  
> -	static const char * const engine_names[] = {
> -		"fragment", "vertex-tiler", "compute-only"
> -	};
> -
> -	BUILD_BUG_ON(ARRAY_SIZE(engine_names) != NUM_JOB_SLOTS);

NIT: We could move this to panfrost_job.c and keep the BUILD_BUG_ON.

> -
>  	for (i = 0; i < NUM_JOB_SLOTS - 1; i++) {
>  		if (pfdev->profile_mode) {
>  			drm_printf(p, "drm-engine-%s:\t%llu ns\n",
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
> index c47d14eabbae..0f0340ffee19 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.c
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.c
> @@ -28,6 +28,10 @@
>  #define job_write(dev, reg, data) writel(data, dev->iomem + (reg))
>  #define job_read(dev, reg) readl(dev->iomem + (reg))
>  
> +const char * const engine_names[] = {
> +	"fragment", "vertex-tiler-compute", "compute-only"
> +};
> +
>  struct panfrost_queue_state {
>  	struct drm_gpu_scheduler sched;
>  	u64 fence_context;
> @@ -846,7 +850,6 @@ int panfrost_job_init(struct panfrost_device *pfdev)
>  		.num_rqs = DRM_SCHED_PRIORITY_COUNT,
>  		.credit_limit = 2,
>  		.timeout = msecs_to_jiffies(JOB_TIMEOUT_MS),
> -		.name = "pan_js",
>  		.dev = pfdev->dev,
>  	};
>  	struct panfrost_job_slot *js;
> @@ -887,6 +890,7 @@ int panfrost_job_init(struct panfrost_device *pfdev)
>  
>  	for (j = 0; j < NUM_JOB_SLOTS; j++) {
>  		js->queue[j].fence_context = dma_fence_context_alloc(1);
> +		args.name = engine_names[j];
>  
>  		ret = drm_sched_init(&js->queue[j].sched, &args);
>  		if (ret) {
> diff --git a/drivers/gpu/drm/panfrost/panfrost_job.h b/drivers/gpu/drm/panfrost/panfrost_job.h
> index 5a30ff1503c6..52ff10b8d3d0 100644
> --- a/drivers/gpu/drm/panfrost/panfrost_job.h
> +++ b/drivers/gpu/drm/panfrost/panfrost_job.h
> @@ -53,6 +53,8 @@ struct panfrost_jm_ctx {
>  	struct drm_sched_entity slot_entity[NUM_JOB_SLOTS];
>  };
>  
> +extern const char * const engine_names[];

NIT: Now this is no longer a local variable I think we should prefix it,
e.g. panfrost_engine_names.

> +
>  int panfrost_jm_ctx_create(struct drm_file *file,
>  			   struct drm_panfrost_jm_ctx_create *args);
>  int panfrost_jm_ctx_destroy(struct drm_file *file, u32 handle);
> 
> base-commit: 30531e9ca7cd4f8c5740babd35cdb465edf73a2d