tests/gem_pread_after_blit.c

/*
 * Copyright © 2009 Intel Corporation
 *
 * 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 (including the next
 * paragraph) 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.
 *
 * Authors:
 *    Eric Anholt <eric@anholt.net>
 *
 */

/** @file gem_pread_after_blit.c
 *
 * This is a test of pread's behavior when getting values out of just-drawn-to
 * buffers.
 *
 * The goal is to catch failure in the whole-buffer-flush or
 * ranged-buffer-flush paths in the kernel.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/time.h>
#include "drm.h"
#include "i915_drm.h"
#include "drmtest.h"
#include "intel_bufmgr.h"
#include "intel_batchbuffer.h"
#include "intel_gpu_tools.h"

static drm_intel_bufmgr *bufmgr;
struct intel_batchbuffer *batch;
static const int width = 512, height = 512;
static const int size = 1024 * 1024;

#define PAGE_SIZE 4096

static drm_intel_bo *
create_bo(uint32_t val)
{
	drm_intel_bo *bo;
	uint32_t *vaddr;
	int i;

	bo = drm_intel_bo_alloc(bufmgr, "src bo", size, 4096);

	/* Fill the BO with dwords starting at start_val */
	drm_intel_bo_map(bo, 1);
	vaddr = bo->virtual;

	for (i = 0; i < 1024 * 1024 / 4; i++)
		vaddr[i] = val++;

	drm_intel_bo_unmap(bo);

	return bo;
}

static void
verify_large_read(drm_intel_bo *bo, uint32_t val)
{
	uint32_t buf[size / 4];
	int i;

	drm_intel_bo_get_subdata(bo, 0, size, buf);

	for (i = 0; i < size / 4; i++) {
		if (buf[i] != val) {
			fprintf(stderr,
				"Unexpected value 0x%08x instead of "
				"0x%08x at offset 0x%08x (%p)\n",
				buf[i], val, i * 4, buf);
			abort();
		}
		val++;
	}
}

/** This reads at the size that Mesa usees for software fallbacks. */
static void
verify_small_read(drm_intel_bo *bo, uint32_t val)
{
	uint32_t buf[4096 / 4];
	int offset, i;

	for (i = 0; i < 4096 / 4; i++)
		buf[i] = 0x00c0ffee;

	for (offset = 0; offset < size; offset += PAGE_SIZE) {
		drm_intel_bo_get_subdata(bo, offset, PAGE_SIZE, buf);

		for (i = 0; i < PAGE_SIZE; i += 4) {
			if (buf[i / 4] != val) {
				fprintf(stderr,
					"Unexpected value 0x%08x instead of "
					"0x%08x at offset 0x%08x\n",
					buf[i / 4], val, i * 4);
				abort();
			}
			val++;
		}
	}
}

int
main(int argc, char **argv)
{
	int fd;
	drm_intel_bo *src1, *src2, *bo;
	uint32_t start1 = 0;
	uint32_t start2 = 1024 * 1024 / 4;

	fd = drm_open_any();

	bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
	drm_intel_bufmgr_gem_enable_reuse(bufmgr);
	batch = intel_batchbuffer_alloc(bufmgr, intel_get_drm_devid(fd));

	src1 = create_bo(start1);
	src2 = create_bo(start2);

	bo = drm_intel_bo_alloc(bufmgr, "dst bo", size, 4096);

	/* First, do a full-buffer read after blitting */
	printf("Large read after blit 1\n");
	intel_copy_bo(batch, bo, src1, width, height);
	verify_large_read(bo, start1);
	printf("Large read after blit 2\n");
	intel_copy_bo(batch, bo, src2, width, height);
	verify_large_read(bo, start2);

	printf("Small reads after blit 1\n");
	intel_copy_bo(batch, bo, src1, width, height);
	verify_small_read(bo, start1);
	printf("Small reads after blit 2\n");
	intel_copy_bo(batch, bo, src2, width, height);
	verify_small_read(bo, start2);

	printf("Large read after blit 3\n");
	intel_copy_bo(batch, bo, src1, width, height);
	verify_large_read(bo, start1);

	drm_intel_bo_unreference(src1);
	drm_intel_bo_unreference(src2);
	drm_intel_bo_unreference(bo);

	intel_batchbuffer_free(batch);
	drm_intel_bufmgr_destroy(bufmgr);

	close(fd);

	return 0;
}