[PATCH v2 1/2] selftests: sync: add test that waits on a destroyed timeline

[Gustavo Padovan]

From: Emilio López <emilio.lopez at collabora.co.uk>

If a sw_sync_timeline is destroyed the fences associated to it need
to be signalled. This test checks that.

Cc: Shuah Khan <shuah at kernel.org>
Cc: linux-kselftest at vger.kernel.org
Signed-off-by: Emilio López <emilio.lopez at collabora.co.uk>
Signed-off-by: Gustavo Padovan <gustavo.padovan at collabora.com>
---
 tools/testing/selftests/sync/sync_test.c |  1 +
 tools/testing/selftests/sync/sync_wait.c | 58 ++++++++++++++++++++++++++++++++
 tools/testing/selftests/sync/synctest.h  |  1 +
 3 files changed, 60 insertions(+)

diff --git a/tools/testing/selftests/sync/sync_test.c b/tools/testing/selftests/sync/sync_test.c
index 62fa666e501a..5d93c9dcc290 100644
--- a/tools/testing/selftests/sync/sync_test.c
+++ b/tools/testing/selftests/sync/sync_test.c
@@ -79,6 +79,7 @@ int main(void)
 	err += RUN_TEST(test_fence_one_timeline_merge);
 	err += RUN_TEST(test_fence_merge_same_fence);
 	err += RUN_TEST(test_fence_multi_timeline_wait);
+	err += RUN_TEST(test_fence_wait_on_destroyed_timeline);
 	err += RUN_TEST(test_stress_two_threads_shared_timeline);
 	err += RUN_TEST(test_consumer_stress_multi_producer_single_consumer);
 	err += RUN_TEST(test_merge_stress_random_merge);
diff --git a/tools/testing/selftests/sync/sync_wait.c b/tools/testing/selftests/sync/sync_wait.c
index d69b752f6550..82ad9f519959 100644
--- a/tools/testing/selftests/sync/sync_wait.c
+++ b/tools/testing/selftests/sync/sync_wait.c
@@ -25,6 +25,7 @@
  *  OTHER DEALINGS IN THE SOFTWARE.
  */
 
+#include <pthread.h>
 #include "sync.h"
 #include "sw_sync.h"
 #include "synctest.h"
@@ -89,3 +90,60 @@ int test_fence_multi_timeline_wait(void)
 
 	return 0;
 }
+
+struct fds_test {
+       int timeline;
+       int fencesig, fencekill;
+       int result;
+};
+
+static int test_fence_wait_on_destroyed_timeline_thread(void *d)
+{
+       struct fds_test *data = d;
+       int ret;
+
+       /* in case of errors */
+       data->result = 1;
+
+       ret = sw_sync_timeline_inc(data->timeline, 100);
+       ASSERT(ret == 0, "Failure advancing timeline\n");
+
+       ret = sync_wait(data->fencekill, -1);
+       ASSERT(ret == 1, "Failure waiting on fence\n");
+
+       /* no errors occurred */
+       data->result = 0;
+       return 0;
+}
+
+int test_fence_wait_on_destroyed_timeline(void)
+{
+       struct fds_test data;
+       pthread_t thread;
+       int valid;
+
+       data.timeline = sw_sync_timeline_create();
+       valid = sw_sync_timeline_is_valid(data.timeline);
+       ASSERT(valid, "Failure allocating timeline\n");
+
+       data.fencesig = sw_sync_fence_create(data.timeline, "allocFence", 100);
+       data.fencekill = sw_sync_fence_create(data.timeline, "allocFence", 200);
+
+       /* Spawn a thread to wait on a fence when the timeline is killed */
+       pthread_create(&thread, NULL, (void *(*)(void *))
+                      test_fence_wait_on_destroyed_timeline_thread, &data);
+
+       /* Wait for the thread to spool up */
+       sync_wait(data.fencesig, -1);
+
+       /* Kill the timeline */
+       sw_sync_timeline_destroy(data.timeline);
+
+       /* wait for the thread to clean up */
+       pthread_join(thread, NULL);
+
+       sw_sync_fence_destroy(data.fencesig);
+       sw_sync_fence_destroy(data.fencekill);
+
+       return data.result;
+}
diff --git a/tools/testing/selftests/sync/synctest.h b/tools/testing/selftests/sync/synctest.h
index e7d1d57dba7a..1cbe1e3658b3 100644
--- a/tools/testing/selftests/sync/synctest.h
+++ b/tools/testing/selftests/sync/synctest.h
@@ -53,6 +53,7 @@ int test_fence_merge_same_fence(void);
 
 /* Fence wait tests */
 int test_fence_multi_timeline_wait(void);
+int test_fence_wait_on_destroyed_timeline(void);
 
 /* Stress test - parallelism */
 int test_stress_two_threads_shared_timeline(void);
-- 
2.13.5