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 <assert.h>
  34 #include <fcntl.h>
  35 #include <inttypes.h>
  36 #include <errno.h>
  37 #include <sys/stat.h>
  38 #include <sys/ioctl.h>
  39 #include <sys/mman.h>
  40 #include <sys/time.h>
  41 #include "drm.h"
  42 #include "i915_drm.h"
  43 #include "drmtest.h"
  44
  45 #define OBJECT_SIZE 16384
  46
  47 static void do_gem_read(int fd, uint32_t handle, void *buf, int len, int loops)
  48 {
  49         while (loops--)
  50                 gem_read(fd, handle, 0, buf, len);
  51 }
  52
  53 static double elapsed(const struct timeval *start,
  54                       const struct timeval *end,
  55                       int loop)
  56 {
  57         return (1e6*(end->tv_sec - start->tv_sec) + (end->tv_usec - start->tv_usec))/loop;
  58 }
  59
  60 static const char *bytes_per_sec(char *buf, double v)
  61 {
  62         const char *order[] = {
  63                 "",
  64                 "KiB",
  65                 "MiB",
  66                 "GiB",
  67                 "TiB",
  68                 NULL,
  69         }, **o = order;
  70
  71         while (v > 1000 && o[1]) {
  72                 v /= 1000;
  73                 o++;
  74         }
  75         sprintf(buf, "%.1f%s/s", v, *o);
  76         return buf;
  77 }
  78
  79
  80 int main(int argc, char **argv)
  81 {
  82         int object_size = 0;
  83         uint32_t buf[20];
  84         uint32_t *src, dst;
  85         int fd, count;
  86         const struct {
  87                 int level;
  88                 const char *name;
  89         } cache[] = {
  90                 { 0, "uncached" },
  91                 { 1, "snoop" },
  92                 { 2, "display" },
  93                 { -1 },
  94         }, *c;
  95
  96         igt_subtest_init(argc, argv);
  97         igt_skip_on_simulation();
  98
  99         if (argc > 1 && atoi(argv[1]))
 100                 object_size = atoi(argv[1]);
 101         if (object_size == 0)
 102                 object_size = OBJECT_SIZE;
 103         object_size = (object_size + 3) & -4;
 104
 105         fd = drm_open_any();
 106
 107         dst = gem_create(fd, object_size);
 108         src = malloc(object_size);
 109
 110         igt_subtest("normal") {
 111                 for (count = 1; count <= 1<<17; count <<= 1) {
 112                         struct timeval start, end;
 113
 114                         gettimeofday(&start, NULL);
 115                         do_gem_read(fd, dst, src, object_size, count);
 116                         gettimeofday(&end, NULL);
 117                         printf("Time to pread %d bytes x %6d:   %7.3fµs, %s\n",
 118                                object_size, count,
 119                                elapsed(&start, &end, count),
 120                                bytes_per_sec((char *)buf, object_size/elapsed(&start, &end, count)*1e6));
 121                         fflush(stdout);
 122                 }
 123         }
 124
 125         for (c = cache; c->level != -1; c++) {
 126                 igt_subtest(c->name) {
 127                         gem_set_caching(fd, dst, c->level);
 128
 129                         for (count = 1; count <= 1<<17; count <<= 1) {
 130                                 struct timeval start, end;
 131
 132                                 gettimeofday(&start, NULL);
 133                                 do_gem_read(fd, dst, src, object_size, count);
 134                                 gettimeofday(&end, NULL);
 135                                 printf("Time to %s pread %d bytes x %6d:        %7.3fµs, %s\n",
 136                                                 c->name, object_size, count,
 137                                                 elapsed(&start, &end, count),
 138                                                 bytes_per_sec((char *)buf, object_size/elapsed(&start, &end, count)*1e6));
 139                                 fflush(stdout);
 140                         }
 141                 }
 142         }
 143
 144         free(src);
 145         gem_close(fd, dst);
 146
 147         close(fd);
 148
 149         igt_exit();
 150 }