tests/gem_exec_nop.c

/*
 * Copyright © 2011 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:
 *    Chris Wilson <chris@chris-wilson.co.uk>
 *
 */

#include <unistd.h>
#include <stdlib.h>
#include <stdint.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/ioctl.h>
#include <sys/mman.h>
#include <sys/time.h>
#include "drm.h"
#include "i915_drm.h"
#include "drmtest.h"

#define MI_BATCH_BUFFER_END	(0xA<<23)

static uint32_t gem_create(int fd, int size)
{
	struct drm_i915_gem_create create;

	create.handle = 0;
	create.size = size;
	(void)drmIoctl(fd, DRM_IOCTL_I915_GEM_CREATE, &create);

	return create.handle;
}

static int gem_write(int fd,
		     uint32_t handle, uint32_t offset,
		     const void *src, int length)
{
	struct drm_i915_gem_pwrite pwrite;

	pwrite.handle = handle;
	pwrite.offset = offset;
	pwrite.size = length;
	pwrite.data_ptr = (uintptr_t)src;
	return drmIoctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite);
}

static void gem_close(int fd, uint32_t handle)
{
	struct drm_gem_close close;

	close.handle = handle;
	(void)drmIoctl(fd, DRM_IOCTL_GEM_CLOSE, &close);
}

static void gem_sync(int fd, uint32_t handle)
{
	struct drm_i915_gem_set_domain set_domain;

	set_domain.handle = handle;
	set_domain.read_domains = I915_GEM_DOMAIN_GTT;
	set_domain.write_domain = I915_GEM_DOMAIN_GTT;

	drmIoctl(fd, DRM_IOCTL_I915_GEM_SET_DOMAIN, &set_domain);
}

static double elapsed(const struct timeval *start,
		      const struct timeval *end,
		      int loop)
{
	return (1e6*(end->tv_sec - start->tv_sec) + (end->tv_usec - start->tv_usec))/loop;
}

static void exec(int fd, uint32_t handle, int loops)
{
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 exec[1];
	int ret;

	exec[0].handle = handle;
	exec[0].relocation_count = 0;
	exec[0].relocs_ptr = 0;
	exec[0].alignment = 0;
	exec[0].offset = 0;
	exec[0].flags = 0;
	exec[0].rsvd1 = 0;
	exec[0].rsvd2 = 0;

	execbuf.buffers_ptr = (uintptr_t)exec;
	execbuf.buffer_count = 1;
	execbuf.batch_start_offset = 0;
	execbuf.batch_len = 8;
	execbuf.cliprects_ptr = 0;
	execbuf.num_cliprects = 0;
	execbuf.DR1 = 0;
	execbuf.DR4 = 0;
	execbuf.flags = 0;
	execbuf.rsvd1 = 0;
	execbuf.rsvd2 = 0;

	while (loops--) {
		ret = drmIoctl(fd,
			       DRM_IOCTL_I915_GEM_EXECBUFFER2,
			       &execbuf);
	}
	gem_sync(fd, handle);
}

int main(int argc, char **argv)
{
	uint32_t batch[2] = {MI_BATCH_BUFFER_END};
	uint32_t handle;
	int count;
	int fd;

	fd = drm_open_any();

	handle = gem_create(fd, 4096);
	gem_write(fd, handle, 0, batch, sizeof(batch));

	for (count = 1; count <= 1<<17; count <<= 1) {
		struct timeval start, end;

		gettimeofday(&start, NULL);
		exec(fd, handle, count);
		gettimeofday(&end, NULL);
		printf("Time to exec x %d:		%7.3fµs\n",
		       count, elapsed(&start, &end, count));
		fflush(stdout);
	}
	gem_close(fd, handle);

	close(fd);

	return 0;
}