radeon_ttm.c revision e88f27b3 
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 "rbo.h"
29
30/* allocate as many single page bo to try to starve the kernel
31 * memory zone (below highmem)
32 */
33void ttm_starve_kernel_private_memory(int fd)
34{
35    struct list_head list;
36    struct rbo *bo, *tmp;
37    unsigned nbo = 0;
38
39    printf("\n[%s]\n", __func__);
40    list_inithead(&list);
41    while (1) {
42        bo = rbo(fd, 0, 4096, 0, NULL);
43        if (bo == NULL) {
44            printf("failing after %d bo\n", nbo);
45            break;
46        }
47        nbo++;
48        list_add(&bo->list, &list);
49    }
50    LIST_FOR_EACH_ENTRY_SAFE(bo, tmp, &list, list) {
51        list_del(&bo->list);
52        rbo_decref(bo);
53    }
54}
55
56int radeon_open_fd(void)
57{
58    return drmOpen("radeon", NULL);
59}
60
61int main(void)
62{
63    int radeonfd;
64
65    radeonfd = radeon_open_fd();
66    if (radeonfd < 0) {
67        fprintf(stderr, "failed to open radeon fd\n");
68        return -1;
69    }
70
71    ttm_starve_kernel_private_memory(radeonfd);
72
73    close(radeonfd);
74    return 0;
75}
76