linux-kernel - Re: [PATCH v8 3/5] drm/panthor: add DRM fdinfo support

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Message-ID: <20241002104006.5e2f744b@collabora.com>
Date: Wed, 2 Oct 2024 10:40:06 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Adrián Larumbe <adrian.larumbe@...labora.com>
Cc: 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>, Sumit Semwal
 <sumit.semwal@...aro.org>, Christian König
 <christian.koenig@....com>, kernel@...labora.com,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 linux-media@...r.kernel.org, linaro-mm-sig@...ts.linaro.org
Subject: Re: [PATCH v8 3/5] drm/panthor: add DRM fdinfo support

On Tue, 24 Sep 2024 00:06:23 +0100
Adrián Larumbe <adrian.larumbe@...labora.com> wrote:

> +static void update_fdinfo_stats(struct panthor_job *job)
> +{
> +	struct panthor_group *group = job->group;
> +	struct panthor_queue *queue = group->queues[job->queue_idx];
> +	struct panthor_gpu_usage *fdinfo = &group->fdinfo.data;
> +	struct panthor_job_profiling_data *times;
> +
> +	times = (struct panthor_job_profiling_data *)
> +		((unsigned long) queue->profiling.slots->kmap +
> +		 (job->profiling.slot * sizeof(struct panthor_job_profiling_data)));

The casting done here is a bit of a mess, so I replaced it by:

	struct panthor_job_profiling_data *slots = queue->profiling.slots->kmap;
	struct panthor_job_profiling_data *data = &slots[job->profiling.slot];

> +
> +	mutex_lock(&group->fdinfo.lock);
> +	if (job->profiling.mask & PANTHOR_DEVICE_PROFILING_CYCLES)
> +		fdinfo->cycles += times->cycles.after - times->cycles.before;
> +	if (job->profiling.mask & PANTHOR_DEVICE_PROFILING_TIMESTAMP)
> +		fdinfo->time += times->time.after - times->time.before;
> +	mutex_unlock(&group->fdinfo.lock);
> +}