gem_exec_fault.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>
 *
 */

/* Measure the time it to takes to bind/unbind objects from the ppGTT */

#include <unistd.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <inttypes.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <time.h>

#include "drm.h"
#include "ioctl_wrappers.h"
#include "drmtest.h"
#include "intel_io.h"
#include "igt_stats.h"

#define LOCAL_I915_EXEC_NO_RELOC (1<<11)
#define LOCAL_I915_EXEC_HANDLE_LUT (1<<12)

#define LOCAL_I915_EXEC_BSD_SHIFT      (13)
#define LOCAL_I915_EXEC_BSD_MASK       (3 << LOCAL_I915_EXEC_BSD_SHIFT)

#define ENGINE_FLAGS  (I915_EXEC_RING_MASK | LOCAL_I915_EXEC_BSD_MASK)

static double elapsed(const struct timespec *start,
		      const struct timespec *end)
{
	return (end->tv_sec - start->tv_sec) + 1e-9*(end->tv_nsec - start->tv_nsec);
}

static uint32_t batch(int fd, uint64_t size)
{
	const uint32_t bbe = MI_BATCH_BUFFER_END;
	uint32_t handle = gem_create(fd, size);
	gem_write(fd, handle, 0, &bbe, sizeof(bbe));
	return handle;
}

static int loop(uint64_t size, unsigned ring, int reps, int ncpus, unsigned flags)
{
	struct drm_i915_gem_execbuffer2 execbuf;
	struct drm_i915_gem_exec_object2 obj;
	unsigned engines[16];
	unsigned nengine;
	double *shared;
	int fd;

	shared = mmap(0, 4096, PROT_WRITE, MAP_SHARED | MAP_ANON, -1, 0);

	fd = drm_open_driver(DRIVER_INTEL);

	memset(&obj, 0, sizeof(obj));
	obj.handle = batch(fd, 4096);

	memset(&execbuf, 0, sizeof(execbuf));
	execbuf.buffers_ptr = (uintptr_t)&obj;
	execbuf.buffer_count = 1;
	execbuf.flags |= LOCAL_I915_EXEC_HANDLE_LUT;
	execbuf.flags |= LOCAL_I915_EXEC_NO_RELOC;
	if (__gem_execbuf(fd, &execbuf)) {
		execbuf.flags = 0;
		if (__gem_execbuf(fd, &execbuf))
			return 77;
	}
	/* let the small object leak; ideally blocking the low address */

	nengine = 0;
	if (ring == -1) {
		for (ring = 1; ring < 16; ring++) {
			execbuf.flags &= ~ENGINE_FLAGS;
			execbuf.flags |= ring;
			if (__gem_execbuf(fd, &execbuf) == 0)
				engines[nengine++] = ring;
		}
	} else
		engines[nengine++] = ring;

	if (size > 1ul << 31)
		obj.flags |= 1 << 3;

	while (reps--) {
		memset(shared, 0, 4096);

		igt_fork(child, ncpus) {
			struct timespec start, end;
			unsigned count = 0;

			obj.handle = batch(fd, size);
			obj.offset = -1;

			clock_gettime(CLOCK_MONOTONIC, &start);
			do {
				for (int inner = 0; inner < 1024; inner++) {
					execbuf.flags &= ~ENGINE_FLAGS;
					execbuf.flags |= engines[count++ % nengine];
					/* fault in */
					obj.alignment = 0;
					gem_execbuf(fd, &execbuf);

					/* fault out */
					obj.alignment = 1ull << 63;
					__gem_execbuf(fd, &execbuf);
				}

				clock_gettime(CLOCK_MONOTONIC, &end);
			} while (elapsed(&start, &end) < 2.);

			gem_sync(fd, obj.handle);
			clock_gettime(CLOCK_MONOTONIC, &end);
			shared[child] = 1e6*elapsed(&start, &end) / count / 2;

			gem_close(fd, obj.handle);
		}
		igt_waitchildren();

		for (int child = 0; child < ncpus; child++)
			shared[ncpus] += shared[child];
		printf("%7.3f\n", shared[ncpus] / ncpus);
	}
	return 0;
}

int main(int argc, char **argv)
{
	unsigned ring = I915_EXEC_RENDER;
	unsigned flags = 0;
	uint64_t size = 4096;
	int reps = 1;
	int ncpus = 1;
	int c;

	while ((c = getopt (argc, argv, "e:r:s:f")) != -1) {
		switch (c) {
		case 'e':
			if (strcmp(optarg, "rcs") == 0)
				ring = I915_EXEC_RENDER;
			else if (strcmp(optarg, "vcs") == 0)
				ring = I915_EXEC_BSD;
			else if (strcmp(optarg, "bcs") == 0)
				ring = I915_EXEC_BLT;
			else if (strcmp(optarg, "vecs") == 0)
				ring = I915_EXEC_VEBOX;
			else if (strcmp(optarg, "all") == 0)
				ring = -1;
			else
				ring = atoi(optarg);
			break;

		case 'r':
			reps = atoi(optarg);
			if (reps < 1)
				reps = 1;
			break;

		case 'f':
			ncpus = sysconf(_SC_NPROCESSORS_ONLN);
			break;

		case 's':
			size = strtoull(optarg, NULL, 0);
			if (size < 4096)
				size = 4096;
			break;

		default:
			break;
		}
	}

	return loop(size, ring, reps, ncpus, flags);
}