tests/gem_pread.c

   1 /*
   2  * Copyright © 2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Chris Wilson <chris@chris-wilson.co.uk>
  25  *
  26  */
  27
  28 #include <unistd.h>
  29 #include <stdlib.h>
  30 #include <stdint.h>
  31 #include <stdio.h>
  32 #include <string.h>
  33 #include <fcntl.h>
  34 #include <inttypes.h>
  35 #include <errno.h>
  36 #include <sys/stat.h>
  37 #include <sys/ioctl.h>
  38 #include <sys/time.h>
  39 #include "drm.h"
  40 #include "ioctl_wrappers.h"
  41 #include "drmtest.h"
  42
  43 #define OBJECT_SIZE 16384
  44
  45 static void do_gem_read(int fd, uint32_t handle, void *buf, int len, int loops)
  46 {
  47         while (loops--)
  48                 gem_read(fd, handle, 0, buf, len);
  49 }
  50
  51 static double elapsed(const struct timeval *start,
  52                       const struct timeval *end,
  53                       int loop)
  54 {
  55         return (1e6*(end->tv_sec - start->tv_sec) + (end->tv_usec - start->tv_usec))/loop;
  56 }
  57
  58 static const char *bytes_per_sec(char *buf, double v)
  59 {
  60         const char *order[] = {
  61                 "",
  62                 "KiB",
  63                 "MiB",
  64                 "GiB",
  65                 "TiB",
  66                 NULL,
  67         }, **o = order;
  68
  69         while (v > 1000 && o[1]) {
  70                 v /= 1000;
  71                 o++;
  72         }
  73         sprintf(buf, "%.1f%s/s", v, *o);
  74         return buf;
  75 }
  76
  77
  78 uint32_t *src, dst;
  79 int fd, count;
  80
  81 int main(int argc, char **argv)
  82 {
  83         int object_size = 0;
  84         uint32_t buf[20];
  85         const struct {
  86                 int level;
  87                 const char *name;
  88         } cache[] = {
  89                 { 0, "uncached" },
  90                 { 1, "snoop" },
  91                 { 2, "display" },
  92                 { -1 },
  93         }, *c;
  94
  95         igt_subtest_init(argc, argv);
  96         igt_skip_on_simulation();
  97
  98         if (argc > 1 && atoi(argv[1]))
  99                 object_size = atoi(argv[1]);
 100         if (object_size == 0)
 101                 object_size = OBJECT_SIZE;
 102         object_size = (object_size + 3) & -4;
 103
 104         igt_fixture {
 105                 fd = drm_open_any();
 106
 107                 dst = gem_create(fd, object_size);
 108                 src = malloc(object_size);
 109         }
 110
 111         igt_subtest("normal") {
 112                 for (count = 1; count <= 1<<17; count <<= 1) {
 113                         struct timeval start, end;
 114
 115                         gettimeofday(&start, NULL);
 116                         do_gem_read(fd, dst, src, object_size, count);
 117                         gettimeofday(&end, NULL);
 118                         igt_info("Time to pread %d bytes x %6d: %7.3fµs, %s\n",
 119                                  object_size, count,
 120                                  elapsed(&start, &end, count),
 121                                  bytes_per_sec((char *)buf, object_size/elapsed(&start, &end, count)*1e6));
 122                         fflush(stdout);
 123                 }
 124         }
 125
 126         for (c = cache; c->level != -1; c++) {
 127                 igt_subtest(c->name) {
 128                         gem_set_caching(fd, dst, c->level);
 129
 130                         for (count = 1; count <= 1<<17; count <<= 1) {
 131                                 struct timeval start, end;
 132
 133                                 gettimeofday(&start, NULL);
 134                                 do_gem_read(fd, dst, src, object_size, count);
 135                                 gettimeofday(&end, NULL);
 136                                 igt_info("Time to %s pread %d bytes x %6d:      %7.3fµs, %s\n",
 137                                          c->name, object_size, count,
 138                                          elapsed(&start, &end, count),
 139                                          bytes_per_sec((char *)buf, object_size/elapsed(&start, &end, count)*1e6));
 140                                 fflush(stdout);
 141                         }
 142                 }
 143         }
 144
 145         igt_fixture {
 146                 free(src);
 147                 gem_close(fd, dst);
 148
 149                 close(fd);
 150         }
 151
 152         igt_exit();
 153 }