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-rw-r--r--tests/i915/gem_pread.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/tests/i915/gem_pread.c b/tests/i915/gem_pread.c
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+++ b/tests/i915/gem_pread.c
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+/*
+ * 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 "igt.h"
+#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 "drm.h"
+
+#define OBJECT_SIZE 16384
+#define LARGE_OBJECT_SIZE 1024 * 1024
+#define KGRN "\x1B[32m"
+#define KRED "\x1B[31m"
+#define KNRM "\x1B[0m"
+
+static void do_gem_read(int fd, uint32_t handle, void *buf, int len, int loops)
+{
+ while (loops--)
+ gem_read(fd, handle, 0, buf, len);
+}
+
+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 const char *bytes_per_sec(char *buf, double v)
+{
+ const char *order[] = {
+ "",
+ "KiB",
+ "MiB",
+ "GiB",
+ "TiB",
+ NULL,
+ }, **o = order;
+
+ while (v > 1000 && o[1]) {
+ v /= 1000;
+ o++;
+ }
+ sprintf(buf, "%.1f%s/s", v, *o);
+ return buf;
+}
+
+
+uint32_t *src, dst;
+uint32_t *dst_user, src_stolen, large_stolen;
+uint32_t *stolen_pf_user, *stolen_nopf_user;
+int fd, count;
+
+int main(int argc, char **argv)
+{
+ int object_size = 0;
+ double usecs;
+ char buf[100];
+ const char* bps;
+ const struct {
+ int level;
+ const char *name;
+ } cache[] = {
+ { 0, "uncached" },
+ { 1, "snoop" },
+ { 2, "display" },
+ { -1 },
+ }, *c;
+
+ igt_subtest_init(argc, argv);
+
+ if (argc > 1 && atoi(argv[1]))
+ object_size = atoi(argv[1]);
+ if (object_size == 0)
+ object_size = OBJECT_SIZE;
+ object_size = (object_size + 3) & -4;
+
+ igt_fixture {
+ fd = drm_open_driver(DRIVER_INTEL);
+
+ dst = gem_create(fd, object_size);
+ src = malloc(object_size);
+ src_stolen = gem_create_stolen(fd, object_size);
+ dst_user = malloc(object_size);
+ }
+
+ igt_subtest("basic") {
+ for (count = 1; count <= 1<<17; count <<= 1) {
+ struct timeval start, end;
+
+ gettimeofday(&start, NULL);
+ do_gem_read(fd, dst, src, object_size, count);
+ gettimeofday(&end, NULL);
+ usecs = elapsed(&start, &end, count);
+ bps = bytes_per_sec(buf, object_size/usecs*1e6);
+ igt_info("Time to pread %d bytes x %6d: %7.3fµs, %s\n",
+ object_size, count, usecs, bps);
+ fflush(stdout);
+ }
+ }
+
+ for (c = cache; c->level != -1; c++) {
+ igt_subtest(c->name) {
+ gem_set_caching(fd, dst, c->level);
+
+ for (count = 1; count <= 1<<17; count <<= 1) {
+ struct timeval start, end;
+
+ gettimeofday(&start, NULL);
+ do_gem_read(fd, dst, src, object_size, count);
+ gettimeofday(&end, NULL);
+ usecs = elapsed(&start, &end, count);
+ bps = bytes_per_sec(buf, object_size/usecs*1e6);
+ igt_info("Time to %s pread %d bytes x %6d: %7.3fµs, %s\n",
+ c->name, object_size, count, usecs, bps);
+ fflush(stdout);
+ }
+ }
+ }
+
+ igt_subtest("stolen-normal") {
+ gem_require_stolen_support(fd);
+ for (count = 1; count <= 1<<17; count <<= 1) {
+ struct timeval start, end;
+
+ gettimeofday(&start, NULL);
+ do_gem_read(fd, src_stolen, dst_user, object_size, count);
+ gettimeofday(&end, NULL);
+ usecs = elapsed(&start, &end, count);
+ bps = bytes_per_sec(buf, object_size/usecs*1e6);
+ igt_info("Time to pread %d bytes x %6d: %7.3fµs, %s\n",
+ object_size, count, usecs, bps);
+ fflush(stdout);
+ }
+ }
+ for (c = cache; c->level != -1; c++) {
+ igt_subtest_f("stolen-%s", c->name) {
+ gem_require_stolen_support(fd);
+ gem_set_caching(fd, src_stolen, c->level);
+
+ for (count = 1; count <= 1<<17; count <<= 1) {
+ struct timeval start, end;
+
+ gettimeofday(&start, NULL);
+ do_gem_read(fd, src_stolen, dst_user,
+ object_size, count);
+ gettimeofday(&end, NULL);
+ usecs = elapsed(&start, &end, count);
+ bps = bytes_per_sec(buf, object_size/usecs*1e6);
+ igt_info("Time to stolen-%s pread %d bytes x %6d: %7.3fµs, %s\n",
+ c->name, object_size, count, usecs, bps);
+ fflush(stdout);
+ }
+ }
+ }
+
+ /* List the time taken in pread operation for stolen objects, with
+ * and without the overhead of page fault handling on accessing the
+ * user space buffer
+ */
+ igt_subtest("pagefault-pread") {
+ gem_require_stolen_support(fd);
+ large_stolen = gem_create_stolen(fd, LARGE_OBJECT_SIZE);
+ stolen_nopf_user = (uint32_t *) mmap(NULL, LARGE_OBJECT_SIZE,
+ PROT_WRITE,
+ MAP_ANONYMOUS|MAP_PRIVATE,
+ -1, 0);
+ igt_assert(stolen_nopf_user);
+
+ for (count = 1; count <= 10; count ++) {
+ struct timeval start, end;
+ double t_elapsed = 0;
+
+ gettimeofday(&start, NULL);
+ do_gem_read(fd, large_stolen, stolen_nopf_user,
+ LARGE_OBJECT_SIZE, 1);
+ gettimeofday(&end, NULL);
+ t_elapsed = elapsed(&start, &end, count);
+ bps = bytes_per_sec(buf, object_size/t_elapsed*1e6);
+ igt_info("Pagefault-N - Time to pread %d bytes: %7.3fµs, %s\n",
+ LARGE_OBJECT_SIZE, t_elapsed, bps);
+
+ stolen_pf_user = (uint32_t *) mmap(NULL, LARGE_OBJECT_SIZE,
+ PROT_WRITE,
+ MAP_ANONYMOUS|MAP_PRIVATE,
+ -1, 0);
+ igt_assert(stolen_pf_user);
+
+ gettimeofday(&start, NULL);
+ do_gem_read(fd, large_stolen, stolen_pf_user,
+ LARGE_OBJECT_SIZE, 1);
+ gettimeofday(&end, NULL);
+ usecs = elapsed(&start, &end, count);
+ bps = bytes_per_sec(buf, object_size/usecs*1e6);
+ igt_info("Pagefault-Y - Time to pread %d bytes: %7.3fµs, %s%s%s\n",
+ LARGE_OBJECT_SIZE, usecs,
+ t_elapsed < usecs ? KGRN : KRED, bps, KNRM);
+ fflush(stdout);
+ munmap(stolen_pf_user, LARGE_OBJECT_SIZE);
+ }
+ munmap(stolen_nopf_user, LARGE_OBJECT_SIZE);
+ gem_close(fd, large_stolen);
+ }
+
+
+ igt_fixture {
+ free(src);
+ gem_close(fd, dst);
+ free(dst_user);
+ gem_close(fd, src_stolen);
+
+ close(fd);
+ }
+
+ igt_exit();
+}
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