From: Robert Foss <robert.f...@collabora.com>

This test verifies that stressing the kernel by creating multiple
consumer/producer threads that wait on a single timeline to be incremented
by another conumer/producer thread does not fail.
And that the order amongst the threads is maintained.

Signed-off-by: Robert Foss <robert.f...@collabora.com>
Reviewed-by: Eric Engestrom <e...@engestrom.ch>
---
 tests/sw_sync.c | 83 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/tests/sw_sync.c b/tests/sw_sync.c
index e607b75..13a5643 100644
--- a/tests/sw_sync.c
+++ b/tests/sw_sync.c
@@ -304,6 +304,86 @@ static void test_sync_multi_consumer(void)
        igt_assert_f(thread_ret == 0, "A sync thread reported failure.\n");
 }
 
+static void * test_sync_multi_consumer_producer_thread(void *arg)
+{
+       data_t *data = arg;
+       int thread_id = data->thread_id;
+       int nbr_threads = data->nbr_threads;
+       int timeline = data->timeline;
+       int iterations = data->nbr_iterations;
+       int ret, i;
+
+       for (i = 0; i < iterations; i++) {
+               int next_point = i * nbr_threads + thread_id;
+               int fence = sw_sync_fence_create(timeline, next_point);
+
+               ret = sw_sync_wait(fence, 1000);
+               if (ret <= 0)
+               {
+                       return (void *) 1;
+               }
+
+               if (*(data->counter) != next_point)
+               {
+                       return (void *) 1;
+               }
+
+               (*data->counter)++;
+
+               /* Kick off the next thread. */
+               sw_sync_timeline_inc(timeline, 1);
+
+               close(fence);
+       }
+       return NULL;
+}
+
+static void test_sync_multi_consumer_producer(void)
+{
+       const uint32_t nbr_threads = 8;
+       const uint32_t nbr_iterations = 1 << 14;
+       data_t data_arr[nbr_threads];
+       pthread_t thread_arr[nbr_threads];
+       int timeline;
+       volatile uint32_t counter = 0;
+       uintptr_t thread_ret = 0;
+       data_t data;
+       int i, ret;
+
+       timeline = sw_sync_timeline_create();
+
+       data.nbr_iterations = nbr_iterations;
+       data.nbr_threads = nbr_threads;
+       data.counter = &counter;
+       data.timeline = timeline;
+
+       /* Start consumer threads. */
+       for (i = 0; i < nbr_threads; i++)
+       {
+               data_arr[i] = data;
+               data_arr[i].thread_id = i;
+               ret = pthread_create(&thread_arr[i], NULL,
+                                    test_sync_multi_consumer_producer_thread,
+                                    (void *) &(data_arr[i]));
+               igt_assert_eq(ret, 0);
+       }
+
+       /* Wait for threads to complete. */
+       for (i = 0; i < nbr_threads; i++)
+       {
+               uintptr_t local_thread_ret;
+               pthread_join(thread_arr[i], (void **)&local_thread_ret);
+               thread_ret |= local_thread_ret;
+       }
+
+       close(timeline);
+
+       igt_assert_f(counter == nbr_threads * nbr_iterations,
+                    "Counter has unexpected value.\n");
+
+       igt_assert_f(thread_ret == 0, "A sync thread reported failure.\n");
+}
+
 igt_main
 {
        igt_subtest("alloc_timeline")
@@ -329,5 +409,8 @@ igt_main
 
        igt_subtest("sync_multi_consumer")
                test_sync_multi_consumer();
+
+       igt_subtest("sync_multi_consumer_producer")
+               test_sync_multi_consumer_producer();
 }
 
-- 
2.9.3

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