2 * Copyright © 2012 Intel Corporation
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:
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
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
24 * Daniel Vetter <daniel.vetter@ffwll.ch>
36 #include <sys/ioctl.h>
42 #define OBJECT_SIZE (1024*1024)
44 /* Testcase: checks whether the kernel handles mmap offset exhaustion correctly
46 * Currently the kernel doesn't reap the mmap offset of purged objects, albeit
47 * there's nothing that prevents it ABI-wise and it helps to get out of corners
48 * (because drm_mm is only 32bit on 32bit archs unfortunately.
50 * Note that on 64bit machines we have plenty of address space (because drm_mm
51 * uses unsigned long).
55 create_and_map_bo(int fd)
60 handle = gem_create(fd, OBJECT_SIZE);
62 ptr = gem_mmap(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
65 fprintf(stderr, "mmap failed\n");
69 /* touch it to force it into the gtt */
72 /* but then unmap it again because we only have limited address space on
74 munmap(ptr, OBJECT_SIZE);
76 /* we happily leak objects to exhaust mmap offset space, the kernel will
77 * reap backing storage. */
78 gem_madvise(fd, handle, I915_MADV_DONTNEED);
81 int main(int argc, char **argv)
85 igt_skip_on_simulation();
89 /* we have 32bit of address space, so try to fit one MB more
91 for (i = 0; i < 4096 + 1; i++)
92 create_and_map_bo(fd);