tests/radeon/radeon_ttm.c

   1 /*
   2  * Copyright © 2011 Red Hat
   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  *    Jerome Glisse <j.glisse@gmail.com>
  25  */
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <unistd.h>
  29 #include "rbo.h"
  30 #include "xf86drm.h"
  31
  32 /* allocate as many single page bo to try to starve the kernel
  33  * memory zone (below highmem)
  34  */
  35 static void ttm_starve_kernel_private_memory(int fd)
  36 {
  37     struct list_head list;
  38     struct rbo *bo, *tmp;
  39     unsigned nbo = 0;
  40
  41     printf("\n[%s]\n", __func__);
  42     list_inithead(&list);
  43     while (1) {
  44         bo = rbo(fd, 0, 4096, 0, NULL);
  45         if (bo == NULL) {
  46             printf("failing after %d bo\n", nbo);
  47             break;
  48         }
  49         nbo++;
  50         list_add(&bo->list, &list);
  51     }
  52     LIST_FOR_EACH_ENTRY_SAFE(bo, tmp, &list, list) {
  53         list_del(&bo->list);
  54         rbo_decref(bo);
  55     }
  56 }
  57
  58 static int radeon_open_fd(void)
  59 {
  60     return drmOpen("radeon", NULL);
  61 }
  62
  63 int main(void)
  64 {
  65     int radeonfd;
  66
  67     radeonfd = radeon_open_fd();
  68     if (radeonfd < 0) {
  69         fprintf(stderr, "failed to open radeon fd\n");
  70         return -1;
  71     }
  72
  73     ttm_starve_kernel_private_memory(radeonfd);
  74
  75     close(radeonfd);
  76     return 0;
  77 }