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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 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 
radeon_open_fd(void)58 static 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