6.11-stable review patch. If anyone has any objections, please let me know.
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From: Boris Brezillon boris.brezillon@collabora.com
commit 7a1f30afe97294281a2ba05977688385744f9844 upstream.
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@vger.kernel.org Signed-off-by: Boris Brezillon boris.brezillon@collabora.com Reviewed-by: Steven Price steven.price@arm.com Reviewed-by: Liviu Dudau liviu.dudau@arm.com Link: https://patchwork.freedesktop.org/patch/msgid/20240905071914.3278599-1-boris... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/panthor/panthor_sched.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- 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 p 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;