linux-kernel - Re: [PATCH v2 2/2] drm/panthor: Add DEV_QUERY_GROUP_PRIORITIES

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Message-ID: <20240906081229.776899b7@collabora.com>
Date: Fri, 6 Sep 2024 08:12:29 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Mary Guillemard <mary.guillemard@...labora.com>
Cc: linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
 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>
Subject: Re: [PATCH v2 2/2] drm/panthor: Add DEV_QUERY_GROUP_PRIORITIES_INFO
 dev query

On Thu,  5 Sep 2024 19:32:23 +0200
Mary Guillemard <mary.guillemard@...labora.com> wrote:

> Expose allowed group priorities with a new device query.
> 
> This new uAPI will be used in Mesa to properly report what priorities a
> user can use for EGL_IMG_context_priority.
> 
> Since this extends the uAPI and because userland needs a way to
> advertise priorities accordingly, this also bumps the driver minor
> version.
> 
> v2:
> - Remove drm_panthor_group_allow_priority_flags definition
> - Document that allowed_mask is a bitmask of drm_panthor_group_priority
> 
> Signed-off-by: Mary Guillemard <mary.guillemard@...labora.com>
> ---
>  drivers/gpu/drm/panthor/panthor_drv.c | 61 ++++++++++++++++++---------
>  include/uapi/drm/panthor_drm.h        | 22 ++++++++++
>  2 files changed, 64 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_drv.c b/drivers/gpu/drm/panthor/panthor_drv.c
> index 7b1db2adcb4c..f85aa2d99f09 100644
> --- a/drivers/gpu/drm/panthor/panthor_drv.c
> +++ b/drivers/gpu/drm/panthor/panthor_drv.c
> @@ -170,6 +170,7 @@ panthor_get_uobj_array(const struct drm_panthor_obj_array *in, u32 min_stride,
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_gpu_info, tiler_present), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_csif_info, pad), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_timestamp_info, current_timestamp), \
> +		 PANTHOR_UOBJ_DECL(struct drm_panthor_group_priorities_info, pad), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_sync_op, timeline_value), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_queue_submit, syncs), \
>  		 PANTHOR_UOBJ_DECL(struct drm_panthor_queue_create, ringbuf_size), \
> @@ -777,11 +778,41 @@ static int panthor_query_timestamp_info(struct panthor_device *ptdev,
>  	return 0;
>  }
>  
> +static int group_priority_permit(struct drm_file *file,
> +				 u8 priority)
> +{
> +	/* Ensure that priority is valid */
> +	if (priority > PANTHOR_GROUP_PRIORITY_REALTIME)
> +		return -EINVAL;
> +
> +	/* Medium priority and below are always allowed */
> +	if (priority <= PANTHOR_GROUP_PRIORITY_MEDIUM)
> +		return 0;
> +
> +	/* Higher priorities require CAP_SYS_NICE or DRM_MASTER */
> +	if (capable(CAP_SYS_NICE) || drm_is_current_master(file))
> +		return 0;
> +
> +	return -EACCES;
> +}
> +
> +static void panthor_query_group_priorities_info(struct drm_file *file,
> +						struct drm_panthor_group_priorities_info *arg)
> +{
> +	int prio;
> +
> +	for (prio = PANTHOR_GROUP_PRIORITY_REALTIME; prio >= 0; prio--) {
> +		if (!group_priority_permit(file, prio))
> +			arg->allowed_mask |= 1 << prio;

nit: we have a BIT() macro for that ;-). Other than that, it looks good
to me.

Reviewed-by: Boris Brezillon <boris.brezillon@...labora.com>