linux-kernel - Re: [PATCH v5 1/2] drm/panthor: Reset queue slots if termination fails

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Message-ID: <b59c9bf1-352a-43db-af05-7b4d4ac526b0@arm.com>
Date: Thu, 12 Jun 2025 16:40:53 +0100
From: Steven Price <steven.price@....com>
To: Ashley Smith <ashley.smith@...labora.com>,
 Boris Brezillon <boris.brezillon@...labora.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>
Cc: kernel@...labora.com,
 "open list:ARM MALI PANTHOR DRM DRIVER" <dri-devel@...ts.freedesktop.org>,
 open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 1/2] drm/panthor: Reset queue slots if termination
 fails

On 03/06/2025 10:49, Ashley Smith wrote:
> This fixes a bug where if we timeout after a suspend and the termination
> fails, due to waiting on a fence that will never be signalled for
> example, we do not resume the group correctly. The fix forces a reset
> for groups that are not terminated correctly.
> 
> Signed-off-by: Ashley Smith <ashley.smith@...labora.com>
> Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block")

Reviewed-by: Steven Price <steven.price@....com>

> ---
>  drivers/gpu/drm/panthor/panthor_sched.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index 43ee57728de5..65d8ae3dcac1 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -2727,8 +2727,17 @@ void panthor_sched_suspend(struct panthor_device *ptdev)
>  			 * automatically terminate all active groups, so let's
>  			 * force the state to halted here.
>  			 */
> -			if (csg_slot->group->state != PANTHOR_CS_GROUP_TERMINATED)
> +			if (csg_slot->group->state != PANTHOR_CS_GROUP_TERMINATED) {
>  				csg_slot->group->state = PANTHOR_CS_GROUP_TERMINATED;
> +
> +				/* Reset the queue slots manually if the termination
> +				 * request failed.
> +				 */
> +				for (i = 0; i < group->queue_count; i++) {
> +					if (group->queues[i])
> +						cs_slot_reset_locked(ptdev, csg_id, i);
> +				}
> +			}
>  			slot_mask &= ~BIT(csg_id);
>  		}
>  	}