linux-kernel - Re: [PATCH 1/2] drm/panthor: Add PANTHOR_GROUP_PRIORITY

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Message-ID: <2b2d13a9-9e84-406a-a803-5366036fa761@arm.com>
Date: Thu, 5 Sep 2024 14:54:42 +0100
From: Mihail Atanassov <mihail.atanassov@....com>
To: Mary Guillemard <mary.guillemard@...labora.com>,
 linux-kernel@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org,
 Boris Brezillon <boris.brezillon@...labora.com>,
 Christopher Healy <healych@...zon.com>, kernel@...labora.com,
 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>, Daniel Vetter <daniel@...ll.ch>,
 nd <nd@....com>
Subject: Re: [PATCH 1/2] drm/panthor: Add PANTHOR_GROUP_PRIORITY_REALTIME
 group priority

Hi Mary,

On 05/09/2024 12:13, Mary Guillemard wrote:
> This adds a new value to drm_panthor_group_priority exposing the
> realtime priority to userspace.
> 
> This is required to implement NV_context_priority_realtime in Mesa.
> 
> Signed-off-by: Mary Guillemard <mary.guillemard@...labora.com>
> ---
>   drivers/gpu/drm/panthor/panthor_drv.c   | 2 +-
>   drivers/gpu/drm/panthor/panthor_sched.c | 2 --
>   include/uapi/drm/panthor_drm.h          | 7 +++++++
>   3 files changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> index 0caf9e9a8c45..7b1db2adcb4c 100644
> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> @@ -1041,7 +1041,7 @@ static int group_priority_permit(struct drm_file *file,
>   				 u8 priority)
>   {
>   	/* Ensure that priority is valid */
> -	if (priority > PANTHOR_GROUP_PRIORITY_HIGH)
> +	if (priority > PANTHOR_GROUP_PRIORITY_REALTIME)
>   		return -EINVAL;
>   
>   	/* Medium priority and below are always allowed */
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index 91a31b70c037..86908ada7335 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -137,8 +137,6 @@ enum panthor_csg_priority {
>   	 * non-real-time groups. When such a group becomes executable,
>   	 * it will evict the group with the lowest non-rt priority if
>   	 * there's no free group slot available.
> -	 *
> -	 * Currently not exposed to userspace.
>   	 */
>   	PANTHOR_CSG_PRIORITY_RT,
>   
> diff --git a/include/uapi/drm/panthor_drm.h b/include/uapi/drm/panthor_drm.h
> index 1fd8473548ac..011a555e4674 100644
> --- a/include/uapi/drm/panthor_drm.h
> +++ b/include/uapi/drm/panthor_drm.h
> @@ -720,6 +720,13 @@ enum drm_panthor_group_priority {
>   	 * Requires CAP_SYS_NICE or DRM_MASTER.
>   	 */
>   	PANTHOR_GROUP_PRIORITY_HIGH,
> +
> +	/**
> +	 * @PANTHOR_GROUP_PRIORITY_REALTIME: Realtime priority group.
> +	 *
> +	 * Requires CAP_SYS_NICE or DRM_MASTER.
> +	 */
> +	PANTHOR_GROUP_PRIORITY_REALTIME,

This is a uapi change, but doesn't have a corresponding driver version 
bump in the same patch. You also document the addition of this enum 
value in the next patch, which also is a tad wonky. If you reversed the 
order of the patches, they'd make more sense IMO.

>   };
>   
>   /**

-- 
Mihail Atanassov <mihail.atanassov@....com>