benchmark: Measure allocation time for objects

A basic measurement, how fast can we create and populate an object with
backing storage?

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

benchmarks/.gitignore

@@ -1,3 +1,4 @@
+gem_create
 gem_exec_ctx
 gem_exec_nop
 gem_mmap

benchmarks/Makefile.sources

@@ -3,6 +3,7 @@ bin_PROGRAMS =                          \
 	intel_upload_blit_large_gtt     \
 	intel_upload_blit_large_map     \
 	intel_upload_blit_small		\
+	gem_create			\
 	gem_exec_ctx			\
 	gem_exec_nop			\
 	gem_mmap			\

benchmarks/gem_create.c

@@ -0,0 +1,176 @@
+/*
+ * Copyright © 2011-2015 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 <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 "igt_aux.h"
+#include "igt_stats.h"
+
+#define OBJECT_SIZE (1<<23)
+
+#define LOCAL_I915_EXEC_NO_RELOC (1<<11)
+#define LOCAL_I915_EXEC_HANDLE_LUT (1<<12)
+
+static int __gem_execbuf(int fd, struct drm_i915_gem_execbuffer2 *execbuf)
+{
+	int err = 0;
+	if (drmIoctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, execbuf))
+		err = -errno;
+	return err;
+}
+
+
+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 void make_busy(int fd, uint32_t handle) 
+{
+	struct drm_i915_gem_execbuffer2 execbuf;
+	struct drm_i915_gem_exec_object2 gem_exec;
+
+	const uint32_t buf[] = {MI_BATCH_BUFFER_END};
+	gem_write(fd, handle, 0, buf, sizeof(buf));
+
+	memset(&gem_exec, 0, sizeof(gem_exec));
+	gem_exec.handle = handle;
+
+	memset(&execbuf, 0, sizeof(execbuf));
+	execbuf.buffers_ptr = (uintptr_t)&gem_exec;
+	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;
+		gem_execbuf(fd, &execbuf);
+	}
+}
+
+int main(int argc, char **argv)
+{
+	int fd = drm_open_any();
+	int size = 0;
+	int busy = 0;
+	int reps = 13;
+	int c, n, s;
+
+	while ((c = getopt (argc, argv, "bs:r:")) != -1) {
+		switch (c) {
+		case 's':
+			size = atoi(optarg);
+			break;
+
+		case 'r':
+			reps = atoi(optarg);
+			if (reps < 1)
+				reps = 1;
+			break;
+
+		case 'b':
+			busy = true;
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	if (size == 0) {
+		for (s = 4096; s <=  OBJECT_SIZE; s <<= 1) {
+			igt_stats_t stats;
+
+			igt_stats_init_with_size(&stats, reps);
+			for (n = 0; n < reps; n++) {
+				struct timespec start, end;
+				uint64_t count = 0;
+
+				clock_gettime(CLOCK_MONOTONIC, &start);
+				do {
+					for (c = 0; c < 1000; c++) {
+						uint32_t handle;
+
+						handle = gem_create(fd, s);
+						gem_set_domain(fd, handle,
+							       I915_GEM_DOMAIN_GTT,
+							       I915_GEM_DOMAIN_GTT);
+						if (busy)
+							make_busy(fd, handle);
+						gem_close(fd, handle);
+					}
+					count += c;
+					clock_gettime(CLOCK_MONOTONIC, &end);
+				} while (end.tv_sec - start.tv_sec < 2);
+
+				igt_stats_push_float(&stats, count / elapsed(&start, &end));
+			}
+			printf("%f\n", igt_stats_get_trimean(&stats));
+			igt_stats_fini(&stats);
+		}
+	} else {
+		for (n = 0; n < reps; n++) {
+			struct timespec start, end;
+			uint64_t count = 0;
+
+			clock_gettime(CLOCK_MONOTONIC, &start);
+			do {
+				for (c = 0; c < 1000; c++) {
+					uint32_t handle;
+
+					handle = gem_create(fd, size);
+					gem_set_domain(fd, handle,
+						       I915_GEM_DOMAIN_GTT,
+						       I915_GEM_DOMAIN_GTT);
+					if (busy)
+						make_busy(fd, handle);
+					gem_close(fd, handle);
+				}
+				count += c;
+				clock_gettime(CLOCK_MONOTONIC, &end);
+			} while (end.tv_sec - start.tv_sec < 2);
+
+			printf("%f\n", count / elapsed(&start, &end));
+		}
+	}
+
+	return 0;
+}