*
* Free up the fence memory after the RCU grace period.
*/
-static void drm_sched_fence_free(struct rcu_head *rcu)
+void drm_sched_fence_free(struct rcu_head *rcu)
{
struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
struct drm_sched_fence *fence = to_drm_sched_fence(f);
}
EXPORT_SYMBOL(to_drm_sched_fence);
-struct drm_sched_fence *drm_sched_fence_create(struct drm_sched_entity *entity,
- void *owner)
+struct drm_sched_fence *drm_sched_fence_alloc(struct drm_sched_entity *entity,
+ void *owner)
{
struct drm_sched_fence *fence = NULL;
- unsigned seq;
fence = kmem_cache_zalloc(sched_fence_slab, GFP_KERNEL);
if (fence == NULL)
return NULL;
fence->owner = owner;
- fence->sched = entity->rq->sched;
spin_lock_init(&fence->lock);
+ return fence;
+}
+
+void drm_sched_fence_init(struct drm_sched_fence *fence,
+ struct drm_sched_entity *entity)
+{
+ unsigned seq;
+
+ fence->sched = entity->rq->sched;
seq = atomic_inc_return(&entity->fence_seq);
dma_fence_init(&fence->scheduled, &drm_sched_fence_ops_scheduled,
&fence->lock, entity->fence_context, seq);
dma_fence_init(&fence->finished, &drm_sched_fence_ops_finished,
&fence->lock, entity->fence_context + 1, seq);
-
- return fence;
}
module_init(drm_sched_fence_slab_init);
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/completion.h>
+#include <linux/dma-resv.h>
#include <uapi/linux/sched/types.h>
#include <drm/drm_print.h>
+#include <drm/drm_gem.h>
#include <drm/gpu_scheduler.h>
#include <drm/spsc_queue.h>
/**
* drm_sched_job_init - init a scheduler job
- *
* @job: scheduler job to init
* @entity: scheduler entity to use
* @owner: job owner for debugging
* Refer to drm_sched_entity_push_job() documentation
* for locking considerations.
*
+ * Drivers must make sure drm_sched_job_cleanup() if this function returns
+ * successfully, even when @job is aborted before drm_sched_job_arm() is called.
+ *
+ * WARNING: amdgpu abuses &drm_sched.ready to signal when the hardware
+ * has died, which can mean that there's no valid runqueue for a @entity.
+ * This function returns -ENOENT in this case (which probably should be -EIO as
+ * a more meanigful return value).
+ *
* Returns 0 for success, negative error code otherwise.
*/
int drm_sched_job_init(struct drm_sched_job *job,
struct drm_sched_entity *entity,
void *owner)
{
- struct drm_gpu_scheduler *sched;
-
drm_sched_entity_select_rq(entity);
if (!entity->rq)
return -ENOENT;
- sched = entity->rq->sched;
-
- job->sched = sched;
job->entity = entity;
- job->s_priority = entity->rq - sched->sched_rq;
- job->s_fence = drm_sched_fence_create(entity, owner);
+ job->s_fence = drm_sched_fence_alloc(entity, owner);
if (!job->s_fence)
return -ENOMEM;
- job->id = atomic64_inc_return(&sched->job_id_count);
INIT_LIST_HEAD(&job->list);
EXPORT_SYMBOL(drm_sched_job_init);
/**
- * drm_sched_job_cleanup - clean up scheduler job resources
+ * drm_sched_job_arm - arm a scheduler job for execution
+ * @job: scheduler job to arm
+ *
+ * This arms a scheduler job for execution. Specifically it initializes the
+ * &drm_sched_job.s_fence of @job, so that it can be attached to struct dma_resv
+ * or other places that need to track the completion of this job.
+ *
+ * Refer to drm_sched_entity_push_job() documentation for locking
+ * considerations.
*
+ * This can only be called if drm_sched_job_init() succeeded.
+ */
+void drm_sched_job_arm(struct drm_sched_job *job)
+{
+ struct drm_gpu_scheduler *sched;
+ struct drm_sched_entity *entity = job->entity;
+
+ BUG_ON(!entity);
+
+ sched = entity->rq->sched;
+
+ job->sched = sched;
+ job->s_priority = entity->rq - sched->sched_rq;
+ job->id = atomic64_inc_return(&sched->job_id_count);
+
+ drm_sched_fence_init(job->s_fence, job->entity);
+}
+EXPORT_SYMBOL(drm_sched_job_arm);
+
+/**
+ * drm_sched_job_cleanup - clean up scheduler job resources
* @job: scheduler job to clean up
+ *
+ * Cleans up the resources allocated with drm_sched_job_init().
+ *
+ * Drivers should call this from their error unwind code if @job is aborted
+ * before drm_sched_job_arm() is called.
+ *
+ * After that point of no return @job is committed to be executed by the
+ * scheduler, and this function should be called from the
+ * &drm_sched_backend_ops.free_job callback.
*/
void drm_sched_job_cleanup(struct drm_sched_job *job)
{
- dma_fence_put(&job->s_fence->finished);
+ if (kref_read(&job->s_fence->finished.refcount)) {
+ /* drm_sched_job_arm() has been called */
+ dma_fence_put(&job->s_fence->finished);
+ } else {
+ /* aborted job before committing to run it */
+ drm_sched_fence_free(&job->s_fence->finished.rcu);
+ }
+
job->s_fence = NULL;
}
EXPORT_SYMBOL(drm_sched_job_cleanup);
int drm_sched_job_init(struct drm_sched_job *job,
struct drm_sched_entity *entity,
void *owner);
+void drm_sched_job_arm(struct drm_sched_job *job);
void drm_sched_entity_modify_sched(struct drm_sched_entity *entity,
struct drm_gpu_scheduler **sched_list,
unsigned int num_sched_list);
enum drm_sched_priority priority);
bool drm_sched_entity_is_ready(struct drm_sched_entity *entity);
-struct drm_sched_fence *drm_sched_fence_create(
+struct drm_sched_fence *drm_sched_fence_alloc(
struct drm_sched_entity *s_entity, void *owner);
+void drm_sched_fence_init(struct drm_sched_fence *fence,
+ struct drm_sched_entity *entity);
+void drm_sched_fence_free(struct rcu_head *rcu);
+
void drm_sched_fence_scheduled(struct drm_sched_fence *fence);
void drm_sched_fence_finished(struct drm_sched_fence *fence);
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