[PATCH v6 4/8] drm/sched: Add new test for DRM_GPU_SCHED_STAT_NO_HANG

[Maíra Canal]

Add a test to submit a single job against a scheduler with the timeout
configured and verify that if the job is still running, the timeout
handler will skip the reset and allow the job to complete.

Signed-off-by: Maíra Canal <mca...@igalia.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursu...@igalia.com>
Reviewed-by: Philipp Stanner <pha...@kernel.org>
---
 drivers/gpu/drm/scheduler/tests/mock_scheduler.c |  5 +++
 drivers/gpu/drm/scheduler/tests/sched_tests.h    |  1 +
 drivers/gpu/drm/scheduler/tests/tests_basic.c    | 43 ++++++++++++++++++++++++
 3 files changed, 49 insertions(+)

diff --git a/drivers/gpu/drm/scheduler/tests/mock_scheduler.c 
b/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
index 
ad96e8db13c414cd773654397b34f83943c15d74..65acffc3fea828ee15fbb4764bd4bf1afa97e8fd
 100644
--- a/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
+++ b/drivers/gpu/drm/scheduler/tests/mock_scheduler.c
@@ -218,6 +218,11 @@ mock_sched_timedout_job(struct drm_sched_job *sched_job)
        struct drm_mock_sched_job *job = drm_sched_job_to_mock_job(sched_job);
        unsigned long flags;
 
+       if (job->flags & DRM_MOCK_SCHED_JOB_DONT_RESET) {
+               job->flags &= ~DRM_MOCK_SCHED_JOB_DONT_RESET;
+               return DRM_GPU_SCHED_STAT_NO_HANG;
+       }
+
        spin_lock_irqsave(&sched->lock, flags);
        if (!dma_fence_is_signaled_locked(&job->hw_fence)) {
                list_del(&job->link);
diff --git a/drivers/gpu/drm/scheduler/tests/sched_tests.h 
b/drivers/gpu/drm/scheduler/tests/sched_tests.h
index 
0eddfb8d89e6521381cee3fb592d4f9194e77fd8..63d4f2ac707497541abf4d4c6aa14f94dafc459b
 100644
--- a/drivers/gpu/drm/scheduler/tests/sched_tests.h
+++ b/drivers/gpu/drm/scheduler/tests/sched_tests.h
@@ -97,6 +97,7 @@ struct drm_mock_sched_job {
 
 #define DRM_MOCK_SCHED_JOB_DONE                0x1
 #define DRM_MOCK_SCHED_JOB_TIMEDOUT    0x2
+#define DRM_MOCK_SCHED_JOB_DONT_RESET  0x4
        unsigned long           flags;
 
        struct list_head        link;
diff --git a/drivers/gpu/drm/scheduler/tests/tests_basic.c 
b/drivers/gpu/drm/scheduler/tests/tests_basic.c
index 
8153c2e7af772cd9f12c1479815678464df6c47b..55eb142bd7c5dfd8fdbbedc41353bdc155d3b79b
 100644
--- a/drivers/gpu/drm/scheduler/tests/tests_basic.c
+++ b/drivers/gpu/drm/scheduler/tests/tests_basic.c
@@ -287,8 +287,51 @@ static void drm_sched_basic_timeout(struct kunit *test)
        drm_mock_sched_entity_free(entity);
 }
 
+static void drm_sched_skip_reset(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 a single job against a scheduler with the timeout configured
+        * and verify that if the job is still running, the timeout handler
+        * will skip the reset and allow the job to complete.
+        */
+
+       entity = drm_mock_sched_entity_new(test,
+                                          DRM_SCHED_PRIORITY_NORMAL,
+                                          sched);
+       job = drm_mock_sched_job_new(test, entity);
+
+       job->flags = DRM_MOCK_SCHED_JOB_DONT_RESET;
+
+       drm_mock_sched_job_submit(job);
+
+       done = drm_mock_sched_job_wait_scheduled(job, HZ);
+       KUNIT_ASSERT_TRUE(test, done);
+
+       done = drm_mock_sched_job_wait_finished(job, 2 * MOCK_TIMEOUT);
+       KUNIT_ASSERT_FALSE(test, done);
+
+       KUNIT_ASSERT_EQ(test,
+                       job->flags & DRM_MOCK_SCHED_JOB_DONT_RESET,
+                       0);
+
+       i = drm_mock_sched_advance(sched, 1);
+       KUNIT_ASSERT_EQ(test, i, 1);
+
+       done = drm_mock_sched_job_wait_finished(job, HZ);
+       KUNIT_ASSERT_TRUE(test, done);
+
+       drm_mock_sched_entity_free(entity);
+}
+
 static struct kunit_case drm_sched_timeout_tests[] = {
        KUNIT_CASE(drm_sched_basic_timeout),
+       KUNIT_CASE(drm_sched_skip_reset),
        {}
 };
 

-- 
2.50.0