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igt/drm_read: Check handling of pagefault on destination buffer

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In theory, this should force i915_gem_fault() when we first use the
buffer (and not at mmap time) and so prevent a __copy_to_user_inatomic()
from writting to the buffer.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2015-11-25 10:46:53 +00:00
parent d84e62478b
commit 3b1a55874d
1 changed files with 41 additions and 0 deletions
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41
tests/drm_read.c
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@ -119,6 +119,44 @@ static void test_invalid_buffer(int in)
teardown(fd);
}
static uint32_t dumb_create(int fd)
{
struct drm_mode_create_dumb arg;
arg.bpp = 32;
arg.width = 32;
arg.height = 32;
do_ioctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &arg);
igt_assert(arg.size >= 4096);
return arg.handle;
}
static void test_fault_buffer(int in)
{
int fd = setup(in, 0);
struct drm_mode_map_dumb arg;
char *buf;
memset(&arg, 0, sizeof(arg));
arg.handle = dumb_create(fd);
do_ioctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &arg);
buf = mmap(0, 4096, PROT_WRITE, MAP_SHARED, fd, arg.offset);
igt_assert(buf != MAP_FAILED);
generate_event(fd);
alarm(1);
igt_assert(read(fd, buf, 4096) > 0);
munmap(buf, 4096);
teardown(fd);
}
static void test_empty(int in, int nonblock, int expected)
{
char buffer[1024];
@ -207,6 +245,9 @@ igt_main
igt_subtest("invalid-buffer")
test_invalid_buffer(fd);
igt_subtest("fault-buffer")
test_fault_buffer(fd);
igt_subtest("empty-block")
test_empty(fd, 0, EINTR);