linux-kernel - Re: [PATCH] drm/panthor: Record devfreq busy as soon as a job is started

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <ZoV48WcKj1hz80sd@e110455-lin.cambridge.arm.com>
Date: Wed, 3 Jul 2024 17:14:41 +0100
From: Liviu Dudau <liviu.dudau@....com>
To: Steven Price <steven.price@....com>
Cc: Boris Brezillon <boris.brezillon@...labora.com>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Adrián Larumbe <adrian.larumbe@...labora.com>
Subject: Re: [PATCH] drm/panthor: Record devfreq busy as soon as a job is
 started

On Wed, Jul 03, 2024 at 04:56:46PM +0100, Steven Price wrote:
> If a queue is already assigned to the hardware, then a newly submitted
> job can start straight away without waiting for the tick. However in
> this case the devfreq infrastructure isn't notified that the GPU is
> busy. By the time the tick happens the job might well have finished and
> no time will be accounted for the GPU being busy.
> 
> Fix this by recording the GPU as busy directly in queue_run_job() in the
> case where there is a CSG assigned and therefore we just ring the
> doorbell.
> 
> Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block")
> Signed-off-by: Steven Price <steven.price@....com>

Reviewed-by: Liviu Dudau <liviu.dudau@....com>

> ---
>  drivers/gpu/drm/panthor/panthor_sched.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index 951ff7e63ea8..e7afaa1ad8dc 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -2942,6 +2942,7 @@ queue_run_job(struct drm_sched_job *sched_job)
>  			pm_runtime_get(ptdev->base.dev);
>  			sched->pm.has_ref = true;
>  		}
> +		panthor_devfreq_record_busy(sched->ptdev);
>  	}
>  
>  	/* Update the last fence. */
> -- 
> 2.39.2
> 

-- 
====================
| I would like to |
| fix the world,  |
| but they're not |
| giving me the   |
 \ source code!  /
  ---------------
    ¯\_(ツ)_/¯