diff options
Diffstat (limited to 'tests/i915/gem_mmap_offset_exhaustion.c')
-rw-r--r-- | tests/i915/gem_mmap_offset_exhaustion.c | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/tests/i915/gem_mmap_offset_exhaustion.c b/tests/i915/gem_mmap_offset_exhaustion.c new file mode 100644 index 00000000..8c8e3fa2 --- /dev/null +++ b/tests/i915/gem_mmap_offset_exhaustion.c @@ -0,0 +1,91 @@ +/* + * Copyright © 2012 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + * Authors: + * Daniel Vetter <daniel.vetter@ffwll.ch> + * + */ + +#include "igt.h" +#include <unistd.h> +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <fcntl.h> +#include <inttypes.h> +#include <errno.h> +#include <sys/stat.h> +#include <sys/ioctl.h> +#include "drm.h" + +IGT_TEST_DESCRIPTION("Checks whether the kernel handles mmap offset exhaustion" + " correctly."); + +#define OBJECT_SIZE (1024*1024) + +/* Testcase: checks whether the kernel handles mmap offset exhaustion correctly + * + * Currently the kernel doesn't reap the mmap offset of purged objects, albeit + * there's nothing that prevents it ABI-wise and it helps to get out of corners + * (because drm_mm is only 32bit on 32bit archs unfortunately. + * + * Note that on 64bit machines we have plenty of address space (because drm_mm + * uses unsigned long). + */ + +static void +create_and_map_bo(int fd) +{ + uint32_t handle; + char *ptr; + + handle = gem_create(fd, OBJECT_SIZE); + + ptr = gem_mmap__gtt(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE); + + /* touch it to force it into the gtt */ + *ptr = 0; + + /* but then unmap it again because we only have limited address space on + * 32 bit */ + munmap(ptr, OBJECT_SIZE); + + /* we happily leak objects to exhaust mmap offset space, the kernel will + * reap backing storage. */ + gem_madvise(fd, handle, I915_MADV_DONTNEED); +} + +igt_simple_main +{ + int fd, i; + + igt_skip_on_simulation(); + + fd = drm_open_driver(DRIVER_INTEL); + + /* we have 32bit of address space, so try to fit one MB more + * than that. */ + for (i = 0; i < 4096 + 1; i++) + create_and_map_bo(fd); + + close(fd); +} |