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drm/scheduler: only kill entity if last user is killed v2

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Note which task is using the entity and only kill it if the last user of
the entity is killed. This should prevent problems when entities are leaked to
child processes.

v2: add missing kernel doc

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Acked-by: Nayan Deshmukh <nayan26deshmukh@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Christian König 2018-07-26 13:43:49 +02:00 committed by Alex Deucher
parent 4a102ad4ba
commit 43bce41cf4
2 changed files with 7 additions and 1 deletions
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6
drivers/gpu/drm/scheduler/gpu_scheduler.c
View File

@ -275,6 +275,7 @@ static void drm_sched_entity_kill_jobs_cb(struct dma_fence *f,
long drm_sched_entity_flush(struct drm_sched_entity *entity, long timeout)
{
struct drm_gpu_scheduler *sched;
struct task_struct *last_user;
long ret = timeout;
sched = entity->rq->sched;
@ -295,7 +296,9 @@ long drm_sched_entity_flush(struct drm_sched_entity *entity, long timeout)
/* For killed process disable any more IBs enqueue right now */
if ((current->flags & PF_EXITING) && (current->exit_code == SIGKILL))
last_user = cmpxchg(&entity->last_user, current->group_leader, NULL);
if ((!last_user || last_user == current->group_leader) &&
(current->flags & PF_EXITING) && (current->exit_code == SIGKILL))
drm_sched_entity_set_rq(entity, NULL);
return ret;
@ -541,6 +544,7 @@ void drm_sched_entity_push_job(struct drm_sched_job *sched_job,
trace_drm_sched_job(sched_job, entity);
WRITE_ONCE(entity->last_user, current->group_leader);
first = spsc_queue_push(&entity->job_queue, &sched_job->queue_node);
/* first job wakes up scheduler */

2
include/drm/gpu_scheduler.h
View File

@ -66,6 +66,7 @@ enum drm_sched_priority {
* @guilty: points to ctx's guilty.
* @fini_status: contains the exit status in case the process was signalled.
* @last_scheduled: points to the finished fence of the last scheduled job.
* @last_user: last group leader pushing a job into the entity.
*
* Entities will emit jobs in order to their corresponding hardware
* ring, and the scheduler will alternate between entities based on
@ -85,6 +86,7 @@ struct drm_sched_entity {
struct dma_fence_cb cb;
atomic_t *guilty;
struct dma_fence *last_scheduled;
struct task_struct *last_user;
};
/**