[PATCH i-g-t v2 09/13] tests/sw_sync: Add subtest test_sync_multi_consumer

[robert.foss@collabora.com]

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

This subtest verifies the access ordering of multiple consumer threads.

Signed-off-by: Robert Foss <robert.foss@collabora.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
---
 tests/sw_sync.c | 103 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)

diff --git a/tests/sw_sync.c b/tests/sw_sync.c
index db03f48..0c9c923 100644
--- a/tests/sw_sync.c
+++ b/tests/sw_sync.c
@@ -27,6 +27,8 @@
  *    Robert Foss <robert.foss@collabora.com>
  */
 
+#include <pthread.h>
+#include <semaphore.h>
 #include <stdint.h>
 
 #include "sw_sync.h"
@@ -35,6 +37,15 @@
 
 IGT_TEST_DESCRIPTION("Test SW Sync Framework");
 
+typedef struct {
+	int timeline;
+	uint32_t thread_id;
+	uint32_t nbr_threads;
+	uint32_t nbr_iterations;
+	volatile uint32_t * volatile counter;
+	sem_t *sem;
+} data_t;
+
 static void test_alloc_timeline(void)
 {
 	int timeline;
@@ -203,6 +214,95 @@ static void test_sync_merge_same(void)
 	sw_sync_timeline_destroy(timeline);
 }
 
+static void * test_sync_multi_consumer_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;
+		}
+
+		sem_post(data->sem);
+		sw_sync_fence_destroy(fence);
+	}
+	return NULL;
+}
+
+static void test_sync_multi_consumer(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];
+	sem_t sem;
+	int timeline;
+	volatile uint32_t counter = 0;
+	uintptr_t thread_ret = 0;
+	data_t data;
+	int i, ret;
+
+	sem_init(&sem, 0, 0);
+	timeline = sw_sync_timeline_create();
+
+	data.nbr_iterations = nbr_iterations;
+	data.nbr_threads = nbr_threads;
+	data.counter = &counter;
+	data.timeline = timeline;
+	data.sem = &sem;
+
+	/* Start sync 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_thread,
+				     (void *) &(data_arr[i]));
+		igt_assert_eq(ret, 0);
+	}
+
+	/* Produce 'content'. */
+	for (i = 0; i < nbr_threads * nbr_iterations; i++)
+	{
+		sem_wait(&sem);
+
+		counter++;
+		sw_sync_timeline_inc(timeline, 1);
+	}
+
+	/* 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;
+	}
+
+	sw_sync_timeline_destroy(timeline);
+	sem_destroy(&sem);
+
+	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")
@@ -225,5 +325,8 @@ igt_main
 
 	igt_subtest("sync_merge_same")
 		test_sync_merge_same();
+
+	igt_subtest("sync_multi_consumer")
+		test_sync_multi_consumer();
 }
 
-- 
2.9.3

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