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drm/sched: Disallow initializing entities with no schedulers

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Since we have removed the case where amdgpu was initializing entitites
with either no schedulers on the list, or with a single NULL scheduler,
and there appears no other drivers which rely on this, we can simplify the
scheduler by explicitly rejecting that early.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Cc: Christian König <christian.koenig@amd.com>
Cc: Danilo Krummrich <dakr@kernel.org>
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Philipp Stanner <phasta@kernel.org>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Philipp Stanner <phasta@kernel.org>
Tested-by: Vitaly Prosyak <vitaly.prosyak@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://patch.msgid.link/20260417103744.76020-2-tvrtko.ursulin@igalia.com
This commit is contained in:
Tvrtko Ursulin
2026-04-17 14:43:28 +02:00
committed by Philipp Stanner
parent cac96c8d93
commit 28c5bf2876
1 changed files with 4 additions and 9 deletions
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drivers/gpu/drm/scheduler/sched_entity.c
+4 -9
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@@ -61,32 +61,27 @@ int drm_sched_entity_init(struct drm_sched_entity *entity,
unsigned int num_sched_list,
atomic_t *guilty)
{
if (!(entity && sched_list && (num_sched_list == 0 || sched_list[0])))
if (!entity || !sched_list || !num_sched_list || !sched_list[0])
return -EINVAL;
memset(entity, 0, sizeof(struct drm_sched_entity));
INIT_LIST_HEAD(&entity->list);
entity->rq = NULL;
entity->guilty = guilty;
entity->num_sched_list = num_sched_list;
entity->priority = priority;
entity->last_user = current->group_leader;
/*
* It's perfectly valid to initialize an entity without having a valid
* scheduler attached. It's just not valid to use the scheduler before it
* is initialized itself.
*/
entity->num_sched_list = num_sched_list;
entity->sched_list = num_sched_list > 1 ? sched_list : NULL;
RCU_INIT_POINTER(entity->last_scheduled, NULL);
RB_CLEAR_NODE(&entity->rb_tree_node);
if (num_sched_list && !sched_list[0]->sched_rq) {
if (!sched_list[0]->sched_rq) {
/* Since every entry covered by num_sched_list
* should be non-NULL and therefore we warn drivers
* not to do this and to fix their DRM calling order.
*/
pr_warn("%s: called with uninitialized scheduler\n", __func__);
} else if (num_sched_list) {
} else {
/* The "priority" of an entity cannot exceed the number of run-queues of a
* scheduler. Protect against num_rqs being 0, by converting to signed. Choose
* the lowest priority available.