1 /*
2 * Copyright © 2012 Intel Corporation
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 * Daniel Vetter <[email protected]>
25 *
26 */
27
28 #include "igt.h"
29 #include <unistd.h>
30 #include <stdlib.h>
31 #include <stdio.h>
32 #include <string.h>
33 #include <fcntl.h>
34 #include <inttypes.h>
35 #include <errno.h>
36 #include <sys/stat.h>
37 #include <sys/ioctl.h>
38 #include "drm.h"
39
40 IGT_TEST_DESCRIPTION("Checks whether the kernel handles mmap offset exhaustion"
41 " correctly.");
42
43 #define OBJECT_SIZE (1024*1024)
44
45 /* Testcase: checks whether the kernel handles mmap offset exhaustion correctly
46 *
47 * Currently the kernel doesn't reap the mmap offset of purged objects, albeit
48 * there's nothing that prevents it ABI-wise and it helps to get out of corners
49 * (because drm_mm is only 32bit on 32bit archs unfortunately.
50 *
51 * Note that on 64bit machines we have plenty of address space (because drm_mm
52 * uses unsigned long).
53 */
54
55 static void
create_and_map_bo(int fd)56 create_and_map_bo(int fd)
57 {
58 uint32_t handle;
59 char *ptr;
60
61 handle = gem_create(fd, OBJECT_SIZE);
62
63 ptr = gem_mmap__gtt(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
64
65 /* touch it to force it into the gtt */
66 *ptr = 0;
67
68 /* but then unmap it again because we only have limited address space on
69 * 32 bit */
70 munmap(ptr, OBJECT_SIZE);
71
72 /* we happily leak objects to exhaust mmap offset space, the kernel will
73 * reap backing storage. */
74 gem_madvise(fd, handle, I915_MADV_DONTNEED);
75 }
76
77 igt_simple_main
78 {
79 int fd, i;
80
81 igt_skip_on_simulation();
82
83 fd = drm_open_driver(DRIVER_INTEL);
84
85 /* we have 32bit of address space, so try to fit one MB more
86 * than that. */
87 for (i = 0; i < 4096 + 1; i++)
88 create_and_map_bo(fd);
89
90 close(fd);
91 }
92