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 */
ttm_starve_kernel_private_memory(int fd)35 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
radeon_open_fd(void)58 int radeon_open_fd(void)
59 {
60 return drmOpen("radeon", NULL);
61 }
62
main(void)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 }
78