+{
+ struct drm_mock_sched_job *job =
+ container_of(fence, typeof(*job), hw_fence);
+
+ hrtimer_cancel(&job->timer);
+
+ /* Freed by the kunit framework */
+}
+
+static const struct dma_fence_ops drm_mock_sched_hw_fence_ops = {
+ .get_driver_name = drm_mock_sched_hw_fence_driver_name,
+ .get_timeline_name = drm_mock_sched_hw_fence_timeline_name,
+ .release = drm_mock_sched_hw_fence_release,
+};
+
+static struct dma_fence *mock_sched_run_job(struct drm_sched_job
*sched_job)
+{
+ struct drm_mock_scheduler *sched =
+ drm_sched_to_mock_sched(sched_job->sched);
+ struct drm_mock_sched_job *job =
drm_sched_job_to_mock_job(sched_job);
+
+ dma_fence_init(&job->hw_fence,
+ &drm_mock_sched_hw_fence_ops,
+ &job->lock,
+ sched->hw_timeline.context,
+ atomic_inc_return(&sched-
hw_timeline.next_seqno));
+
+ dma_fence_get(&job->hw_fence); /* Reference for the job_list
*/
+
+ spin_lock_irq(&sched->lock);
+ if (job->duration_us) {
+ ktime_t prev_finish_at = 0;
+
+ if (!list_empty(&sched->job_list)) {
+ struct drm_mock_sched_job *prev =
+ list_last_entry(&sched->job_list,
typeof(*prev),
+ link);
+
+ prev_finish_at = prev->finish_at;
+ }
+
+ if (!prev_finish_at)
+ prev_finish_at = ktime_get();
+
+ job->finish_at = ktime_add_us(prev_finish_at, job-
duration_us);
+ }
+ list_add_tail(&job->link, &sched->job_list);
+ if (job->finish_at)
+ hrtimer_start(&job->timer, job->finish_at,
HRTIMER_MODE_ABS);
+ spin_unlock_irq(&sched->lock);
+
+ return &job->hw_fence;
+}
+
+static enum drm_gpu_sched_stat
+mock_sched_timedout_job(struct drm_sched_job *sched_job)
+{
+ return DRM_GPU_SCHED_STAT_ENODEV;
+}
+
+static void mock_sched_free_job(struct drm_sched_job *sched_job)
+{
+ drm_sched_job_cleanup(sched_job);
+}
+
+static const struct drm_sched_backend_ops drm_mock_scheduler_ops = {
+ .run_job = mock_sched_run_job,
+ .timedout_job = mock_sched_timedout_job,
+ .free_job = mock_sched_free_job
+};
+
+struct drm_mock_scheduler *drm_mock_new_scheduler(struct kunit
*test)
+{
+ struct drm_mock_scheduler *sched;
+ int ret;
+
+ sched = kunit_kzalloc(test, sizeof(*sched), GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, sched);
+
+ ret = drm_sched_init(&sched->base,
+ &drm_mock_scheduler_ops,
+ NULL, /* wq */
+ DRM_SCHED_PRIORITY_COUNT,
+ U32_MAX, /* max credits */
+ UINT_MAX, /* hang limit */
+ MAX_SCHEDULE_TIMEOUT, /* timeout */
+ NULL, /* timeout wq */
+ NULL, /* score */
+ "drm-mock-scheduler",
+ NULL /* dev */);
+ KUNIT_ASSERT_EQ(test, ret, 0);
+
+ sched->test = test;
+ sched->hw_timeline.context = dma_fence_context_alloc(1);
+ atomic_set(&sched->hw_timeline.next_seqno, 0);
+ INIT_LIST_HEAD(&sched->job_list);
+ spin_lock_init(&sched->lock);
+
+ return sched;
+}
+
+void drm_mock_scheduler_fini(struct drm_mock_scheduler *sched)
+{
+ struct drm_mock_sched_job *job, *next;
+ unsigned long flags;
+ LIST_HEAD(signal);
+
+ spin_lock_irqsave(&sched->lock, flags);
+ list_for_each_entry_safe(job, next, &sched->job_list, link)
+ list_move_tail(&job->link, &signal);
+ spin_unlock_irqrestore(&sched->lock, flags);
+
+ list_for_each_entry(job, &signal, link) {
+ hrtimer_cancel(&job->timer);
+ dma_fence_put(&job->hw_fence);
+ }
+
+ drm_sched_fini(&sched->base);
+}
+
+unsigned int drm_mock_sched_advance(struct drm_mock_scheduler
*sched,
+ unsigned int num)
+{
+ struct drm_mock_sched_job *job, *next;
+ unsigned int found = 0;
+ unsigned long flags;
+ LIST_HEAD(signal);
+
+ spin_lock_irqsave(&sched->lock, flags);
+ if (WARN_ON_ONCE(sched->hw_timeline.cur_seqno + num <
+ sched->hw_timeline.cur_seqno))
+ goto unlock;
+ sched->hw_timeline.cur_seqno += num;
+ list_for_each_entry_safe(job, next, &sched->job_list, link)
{
+ if (sched->hw_timeline.cur_seqno < job-
hw_fence.seqno)
+ break;
+
+ list_move_tail(&job->link, &signal);
+ found++;
+ }
+unlock:
+ spin_unlock_irqrestore(&sched->lock, flags);
+
+ list_for_each_entry(job, &signal, link) {
+ dma_fence_signal(&job->hw_fence);
+ dma_fence_put(&job->hw_fence);
+ }
+
+ return found;
+}
diff --git a/drivers/gpu/drm/scheduler/tests/drm_sched_tests.h
b/drivers/gpu/drm/scheduler/tests/drm_sched_tests.h
new file mode 100644
index 000000000000..e22f7ead6d4e
--- /dev/null
+++ b/drivers/gpu/drm/scheduler/tests/drm_sched_tests.h
@@ -0,0 +1,128 @@
+#ifndef _DRM_SCHED_TESTS_H_
+#define _DRM_SCHED_TESTS_H_
+
+#include <kunit/test.h>
+#include <linux/atomic.h>
+#include <linux/dma-fence.h>
+#include <linux/hrtimer.h>
+#include <linux/ktime.h>
+#include <linux/list.h>
+#include <linux/atomic.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+
+#include <drm/gpu_scheduler.h>
+
+struct drm_mock_scheduler {
+ struct drm_gpu_scheduler base;
+
+ struct kunit *test;
+
+ spinlock_t lock;
+ struct list_head job_list; /* Protected by the lock
*/
+
+ struct {
+ u64 context;
+ atomic_t next_seqno;
+ unsigned int cur_seqno; /* Protected by the lock
*/
+ } hw_timeline;
+};
+
+struct drm_mock_sched_entity {
+ struct drm_sched_entity base;
+
+ struct kunit *test;
+};
+
+struct drm_mock_sched_job {
+ struct drm_sched_job base;
+
+ struct list_head link;
+ struct hrtimer timer;
+
+ unsigned int duration_us;
+ ktime_t finish_at;
+
+ spinlock_t lock;
+ struct dma_fence hw_fence;
+
+ struct kunit *test;
+};
+
+static inline struct drm_mock_scheduler *
+drm_sched_to_mock_sched(struct drm_gpu_scheduler *sched)
+{
+ return container_of(sched, struct drm_mock_scheduler, base);
+};
+
+static inline struct drm_mock_sched_entity *
+drm_sched_entity_to_mock_entity(struct drm_sched_entity
*sched_entity)
+{
+ return container_of(sched_entity, struct
drm_mock_sched_entity, base);
+};
+
+static inline struct drm_mock_sched_job *
+drm_sched_job_to_mock_job(struct drm_sched_job *sched_job)
+{
+ return container_of(sched_job, struct drm_mock_sched_job,
base);
+};
+
+struct drm_mock_scheduler *drm_mock_new_scheduler(struct kunit
*test);
+void drm_mock_scheduler_fini(struct drm_mock_scheduler *sched);
+unsigned int drm_mock_sched_advance(struct drm_mock_scheduler
*sched,
+ unsigned int num);
+
+struct drm_mock_sched_entity *
+drm_mock_new_sched_entity(struct kunit *test,
+ enum drm_sched_priority priority,
+ struct drm_mock_scheduler *sched);
+void drm_mock_sched_entity_free(struct drm_mock_sched_entity
*entity);
+
+struct drm_mock_sched_job *
+drm_mock_new_sched_job(struct kunit *test,
+ struct drm_mock_sched_entity *entity);
+
+static inline void drm_mock_sched_job_submit(struct
drm_mock_sched_job *job)
+{
+ drm_sched_job_arm(&job->base);
+ drm_sched_entity_push_job(&job->base);
+}
+
+static inline void
+drm_mock_sched_job_set_duration_us(struct drm_mock_sched_job *job,
+ unsigned int duration_us)
+{
+ job->duration_us = duration_us;
+}
+
+static inline bool
+drm_mock_sched_job_is_finished(struct drm_mock_sched_job *job)
+{
+ return dma_fence_is_signaled(&job->base.s_fence->finished);
+}
+
+static inline bool
+drm_mock_sched_job_wait_finished(struct drm_mock_sched_job *job,
long timeout)
+{
+ long ret;
+
+ ret = dma_fence_wait_timeout(&job->base.s_fence->finished,
+ false,
+ timeout);
+
+ return ret != 0;
+}
+
+static inline long
+drm_mock_sched_job_wait_scheduled(struct drm_mock_sched_job *job,
long timeout)
+{
+ long ret;
+
+ ret = dma_fence_wait_timeout(&job->base.s_fence->scheduled,
+ false,
+ timeout);
+
+ return ret != 0;
+}
+
+#endif
diff --git a/drivers/gpu/drm/scheduler/tests/drm_sched_tests_basic.c
b/drivers/gpu/drm/scheduler/tests/drm_sched_tests_basic.c
new file mode 100644
index 000000000000..030d7e6ea484
--- /dev/null
+++ b/drivers/gpu/drm/scheduler/tests/drm_sched_tests_basic.c
@@ -0,0 +1,188 @@
+
+#include "drm_sched_tests.h"
+
+static int drm_sched_basic_init(struct kunit *test)
+{
+ test->priv = drm_mock_new_scheduler(test);
+
+ return 0;
+}
+
+static void drm_sched_basic_exit(struct kunit *test)
+{
+ struct drm_mock_scheduler *sched = test->priv;
+
+ drm_mock_scheduler_fini(sched);
+}
+
+static void drm_sched_basic_submit(struct kunit *test)
+{
+ struct drm_mock_scheduler *sched = test->priv;
+ struct drm_mock_sched_entity *entity;
+ struct drm_mock_sched_job *job;
+ unsigned int i;
+ bool done;
+
+ /*
+ * Submit one job to the scheduler and verify that it gets
scheduled
+ * and completed only when the mock hw backend processes it.
+ */
+
+ entity = drm_mock_new_sched_entity(test,
+
DRM_SCHED_PRIORITY_NORMAL,
+ sched);
+ job = drm_mock_new_sched_job(test, entity);
+
+ drm_mock_sched_job_submit(job);
+
+ done = drm_mock_sched_job_wait_scheduled(job, HZ);
+ KUNIT_ASSERT_EQ(test, done, true);
+
+ done = drm_mock_sched_job_wait_finished(job, HZ / 2);
+ KUNIT_ASSERT_EQ(test, done, false);
+
+ i = drm_mock_sched_advance(sched, 1);
+ KUNIT_ASSERT_EQ(test, i, 1);
+
+ done = drm_mock_sched_job_wait_finished(job, HZ);
+ KUNIT_ASSERT_EQ(test, done, true);
+
+ drm_mock_sched_entity_free(entity);
+}
+
+struct drm_sched_basic_params {
+ const char *description;
+ unsigned int queue_depth;
+ unsigned int num_entities;
+ unsigned int job_us;
+ bool dep_chain;
+};
+
+static const struct drm_sched_basic_params drm_sched_basic_cases[] =
{
+ {
+ .description = "A queue of jobs in a single entity",
+ .queue_depth = 100,
+ .job_us = 1000,
+ .num_entities = 1,
+ },
+ {
+ .description = "A chain of dependent jobs across
multiple entities",
+ .queue_depth = 100,
+ .job_us = 1000,
+ .num_entities = 1,
+ .dep_chain = true,
+ },
+ {
+ .description = "Multiple independent job queues",
+ .queue_depth = 100,
+ .job_us = 1000,
+ .num_entities = 4,
+ },
+ {
+ .description = "Multiple inter-dependent job
queues",
+ .queue_depth = 100,
+ .job_us = 1000,
+ .num_entities = 4,
+ .dep_chain = true,
+ },
+};
+
+static void
+drm_sched_basic_desc(const struct drm_sched_basic_params *params,
char *desc)
+{
+ strscpy(desc, params->description, KUNIT_PARAM_DESC_SIZE);
+}
+
+KUNIT_ARRAY_PARAM(drm_sched_basic, drm_sched_basic_cases,
drm_sched_basic_desc);
+
+static void drm_sched_basic_test(struct kunit *test)
+{
+ const struct drm_sched_basic_params *params = test-
param_value;
+ struct drm_mock_scheduler *sched = test->priv;
+ struct drm_mock_sched_job *job, *prev = NULL;
+ struct drm_mock_sched_entity **entity;
+ unsigned int i, cur_ent = 0;
+ bool done;
+
+ entity = kunit_kcalloc(test, params->num_entities,
sizeof(*entity),
+ GFP_KERNEL);
+ KUNIT_ASSERT_NOT_NULL(test, entity);
+
+ for (i = 0; i < params->num_entities; i++)
+ entity[i] = drm_mock_new_sched_entity(test,
+
DRM_SCHED_PRIORITY_NORMAL,
+ sched);
+
+ for (i = 0; i < params->queue_depth; i++) {
+ job = drm_mock_new_sched_job(test,
entity[cur_ent++]);
+ cur_ent %= params->num_entities;
+ drm_mock_sched_job_set_duration_us(job, params-
job_us);
+ if (params->dep_chain && prev)
+ drm_sched_job_add_dependency(&job->base,
+
dma_fence_get(&prev->base.s_fence->finished));
+ drm_mock_sched_job_submit(job);
+ prev = job;
+ }
+
+ done = drm_mock_sched_job_wait_finished(job, HZ);
+ KUNIT_ASSERT_EQ(test, done, true);
+
+ for (i = 0; i < params->num_entities; i++)
+ drm_mock_sched_entity_free(entity[i]);
+}
+
+static void drm_sched_basic_entity_cleanup(struct kunit *test)
+{
+ struct drm_mock_sched_job *job, *mid, *prev = NULL;
+ struct drm_mock_scheduler *sched = test->priv;
+ struct drm_mock_sched_entity *entity[4];
+ const unsigned int qd = 100;
+ unsigned int i, cur_ent = 0;
+ bool done;
+
+ /*
+ * Submit a queue of jobs across different entities with an
explicit
+ * chain of dependencies between them and trigger entity
cleanup while
+ * the queue is still being processed.
+ */
+
+ for (i = 0; i < ARRAY_SIZE(entity); i++)
+ entity[i] = drm_mock_new_sched_entity(test,
+
DRM_SCHED_PRIORITY_NORMAL,
+ sched);
+
+ for (i = 0; i < qd; i++) {
+ job = drm_mock_new_sched_job(test,
entity[cur_ent++]);
+ cur_ent %= ARRAY_SIZE(entity);
+ drm_mock_sched_job_set_duration_us(job, 1000);
+ if (prev)
+ drm_sched_job_add_dependency(&job->base,
+
dma_fence_get(&prev->base.s_fence->finished));
+ drm_mock_sched_job_submit(job);
+ if (i == qd / 2)
+ mid = job;
+ prev = job;
+ }
+
+ done = drm_mock_sched_job_wait_finished(mid, HZ);
+ KUNIT_ASSERT_EQ(test, done, true);
+
+ /* Exit with half of the queue still pending to be executed.
*/
+ for (i = 0; i < ARRAY_SIZE(entity); i++)
+ drm_mock_sched_entity_free(entity[i]);}
+
+static struct kunit_case drm_sched_basic_tests[] = {
+ KUNIT_CASE(drm_sched_basic_submit),
+ KUNIT_CASE_PARAM(drm_sched_basic_test,
drm_sched_basic_gen_params),
+ KUNIT_CASE(drm_sched_basic_entity_cleanup),
+ {}
+};
+
+static struct kunit_suite drm_sched_basic = {
+ .name = "drm_sched_basic_tests",
+ .init = drm_sched_basic_init,
+ .exit = drm_sched_basic_exit,
+ .test_cases = drm_sched_basic_tests,
+};
+
+kunit_test_suite(drm_sched_basic);
