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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 (at) 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 }
     78