[PATCH] drm/panthor: Don't declare a queue blocked if deferred operations are pending
Liviu Dudau
liviu.dudau at arm.com
Thu Sep 5 13:15:59 UTC 2024
On Thu, Sep 05, 2024 at 09:19:14AM +0200, Boris Brezillon wrote:
> If deferred operations are pending, we want to wait for those to
> land before declaring the queue blocked on a SYNC_WAIT. We need
> this to deal with the case where the sync object is signalled through
> a deferred SYNC_{ADD,SET} from the same queue. If we don't do that
> and the group gets scheduled out before the deferred SYNC_{SET,ADD}
> is executed, we'll end up with a timeout, because no external
> SYNC_{SET,ADD} will make the scheduler reconsider the group for
> execution.
>
> Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block")
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
Reviewed-by: Liviu Dudau <liviu.dudau at arm.com>
Best regards,
Liviu
> ---
> drivers/gpu/drm/panthor/panthor_sched.c | 8 +++++++-
> 1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c
> index 41260cf4beb8..201d5e7a921e 100644
> --- a/drivers/gpu/drm/panthor/panthor_sched.c
> +++ b/drivers/gpu/drm/panthor/panthor_sched.c
> @@ -1103,7 +1103,13 @@ cs_slot_sync_queue_state_locked(struct panthor_device *ptdev, u32 csg_id, u32 cs
> list_move_tail(&group->wait_node,
> &group->ptdev->scheduler->groups.waiting);
> }
> - group->blocked_queues |= BIT(cs_id);
> +
> + /* The queue is only blocked if there's no deferred operation
> + * pending, which can be checked through the scoreboard status.
> + */
> + if (!cs_iface->output->status_scoreboards)
> + group->blocked_queues |= BIT(cs_id);
> +
> queue->syncwait.gpu_va = cs_iface->output->status_wait_sync_ptr;
> queue->syncwait.ref = cs_iface->output->status_wait_sync_value;
> status_wait_cond = cs_iface->output->status_wait & CS_STATUS_WAIT_SYNC_COND_MASK;
> --
> 2.46.0
>
--
====================
| I would like to |
| fix the world, |
| but they're not |
| giving me the |
\ source code! /
---------------
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