original_kernel/tools/testing/selftests/sync/sync_stress_merge.c

/*
 *  sync stress test: merging
 *  Copyright 2015-2016 Collabora Ltd.
 *
 *  Based on the implementation from the Android Open Source Project,
 *
 *  Copyright 2012 Google, Inc
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a
 *  copy of this software and associated documentation files (the "Software"),
 *  to deal in the Software without restriction, including without limitation
 *  the rights to use, copy, modify, merge, publish, distribute, sublicense,
 *  and/or sell copies of the Software, and to permit persons to whom the
 *  Software is furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in
 *  all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 *  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 *  OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 *  ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 *  OTHER DEALINGS IN THE SOFTWARE.
 */

#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "sync.h"
#include "sw_sync.h"
#include "synctest.h"

int test_merge_stress_random_merge(void)
{
	int i, size, ret;
	int timeline_count = 32;
	int merge_count = 1024 * 32;
	int timelines[timeline_count];
	int fence_map[timeline_count];
	int fence, tmpfence, merged, valid;
	int timeline, timeline_offset, sync_point;

	srand(time(NULL));

	for (i = 0; i < timeline_count; i++)
		timelines[i] = sw_sync_timeline_create();

	fence = sw_sync_fence_create(timelines[0], "fence", 0);
	valid = sw_sync_fence_is_valid(fence);
	ASSERT(valid, "Failure creating fence\n");

	memset(fence_map, -1, sizeof(fence_map));
	fence_map[0] = 0;

	/*
	 * Randomly create sync_points out of a fixed set of timelines,
	 * and merge them together
	 */
	for (i = 0; i < merge_count; i++) {
		/* Generate sync_point. */
		timeline_offset = rand() % timeline_count;
		timeline = timelines[timeline_offset];
		sync_point = rand();

		/* Keep track of the latest sync_point in each timeline. */
		if (fence_map[timeline_offset] == -1)
			fence_map[timeline_offset] = sync_point;
		else if (fence_map[timeline_offset] < sync_point)
			fence_map[timeline_offset] = sync_point;

		/* Merge */
		tmpfence = sw_sync_fence_create(timeline, "fence", sync_point);
		merged = sync_merge("merge", tmpfence, fence);
		sw_sync_fence_destroy(tmpfence);
		sw_sync_fence_destroy(fence);
		fence = merged;

		valid = sw_sync_fence_is_valid(merged);
		ASSERT(valid, "Failure creating fence i\n");
	}

	size = 0;
	for (i = 0; i < timeline_count; i++)
		if (fence_map[i] != -1)
			size++;

	/* Confirm our map matches the fence. */
	ASSERT(sync_fence_size(fence) == size,
	       "Quantity of elements not matching\n");

	/* Trigger the merged fence */
	for (i = 0; i < timeline_count; i++) {
		if (fence_map[i] != -1) {
			ret = sync_wait(fence, 0);
			ASSERT(ret == 0,
			       "Failure waiting on fence until timeout\n");
			/* Increment the timeline to the last sync_point */
			sw_sync_timeline_inc(timelines[i], fence_map[i]);
		}
	}

	/* Check that the fence is triggered. */
	ret = sync_wait(fence, 0);
	ASSERT(ret > 0, "Failure triggering fence\n");

	sw_sync_fence_destroy(fence);

	for (i = 0; i < timeline_count; i++)
		sw_sync_timeline_destroy(timelines[i]);

	return 0;
}