linux-kernel - Re: [PATCH v4 0/4] Introduce Panfrost JM contexts

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Message-ID: <8434d14e-827d-4652-b4f8-06e2aa4caa41@arm.com>
Date: Thu, 18 Sep 2025 14:58:46 +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
Subject: Re: [PATCH v4 0/4] Introduce Panfrost JM contexts

On 17/09/2025 20:18, Adrián Larumbe wrote:
> This patch series brings the notion of JM contexts into Panfrost.
> UM will be able to create contexts, get a handle for them and attach
> it to a job submission. Contexts describe basic HW resource assignment
> to jobs, but at the moment that includes priorities only.
> 
> There's a MR for a Mesa commit series that makes use of these changes:
> https://lore.kernel.org/dri-devel/20250904001054.147465-1-adrian.larumbe@collabora.com/
> 
> Discussion of the previous patch series revision can be found at:
> https://lore.kernel.org/dri-devel/20250912132002.304187-1-adrian.larumbe@collabora.com/

Pushed to drm-misc-next.

Thanks,
Steve

> 
> Changelog:
> v4:
>  - Iterate over all the indices for the scheduler entity array when creating,
>  releasing or otherwise destroying a job context, in case someone would want to
>  implement compute support in the future.
>  - Add R-b tags to other patches.
> v3:
>  - Cut down number of available contexts per file to 64.
>  - Conservatively restored JS thread priority back to 8.
>  - Rework of the context destruction and scheduler entity release
>  logic to avoid races and that no new jobs are run after ctx destruction.
>  - Refactor privilege checks when allowing high context priorities.
>  - Checked that uapi struct padding fields are zeroed in ioctls
> 
> v2:
>  - Core and L2 cache affinities are not longer part of the context uAPI
>  - Individual JS priorites are no longer possible, and the same context
>  priority is applied onto all the JS and scheduler entities.
>  - Minor changes in the debugfs knob to reflect all the above.
> 
> Boris Brezillon (4):
>   drm/panfrost: Introduce uAPI for JM context creation
>   drm/panfrost: Introduce JM contexts for manging job resources
>   drm/panfrost: Expose JM context IOCTLs to UM
>   drm/panfrost: Display list of device JM contexts over debugfs
> 
>  drivers/gpu/drm/panfrost/panfrost_device.h |  11 +-
>  drivers/gpu/drm/panfrost/panfrost_drv.c    | 150 +++++++++++++++-
>  drivers/gpu/drm/panfrost/panfrost_job.c    | 195 +++++++++++++++++----
>  drivers/gpu/drm/panfrost/panfrost_job.h    |  25 ++-
>  include/uapi/drm/panfrost_drm.h            |  50 ++++++
>  5 files changed, 391 insertions(+), 40 deletions(-)
> 
> 
> base-commit: a3ae3384be7704fcf41279f13190bd8a11204bea
> --
> 2.51.0