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igt/gem_mmap_gtt: Check coherency between GTT and CPU mmappings with LLC

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Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2014-09-08 10:28:41 +01:00
parent ac3d06094a
commit b76f1d8b03
3 changed files with 44 additions and 0 deletions
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16
lib/ioctl_wrappers.c
View File

@ -643,6 +643,22 @@ int gem_available_fences(int fd)
return val;
}
bool gem_has_llc(int fd)
{
struct drm_i915_getparam gp;
int val = 0;
memset(&gp, 0, sizeof(gp));
gp.param = I915_PARAM_HAS_LLC;
gp.value = &val;
if (ioctl(fd, DRM_IOCTL_I915_GETPARAM, &gp, sizeof(gp)))
return 0;
errno = 0;
return val;
}
/**
* gem_get_num_rings:
* @fd: open i915 drm file descriptor

1
lib/ioctl_wrappers.h
View File

@ -78,6 +78,7 @@ void gem_sw_finish(int fd, uint32_t handle);
bool gem_bo_busy(int fd, uint32_t handle);
/* feature test helpers */
bool gem_has_llc(int fd);
int gem_get_num_rings(int fd);
bool gem_has_enable_ring(int fd,int param);
bool gem_has_bsd(int fd);

27
tests/gem_mmap_gtt.c
View File

@ -273,6 +273,31 @@ test_read(int fd)
munmap(dst, OBJECT_SIZE);
}
static void
test_write_cpu_read_gtt(int fd)
{
uint32_t handle;
uint32_t *src, *dst;
igt_require(gem_has_llc(fd));
handle = gem_create(fd, OBJECT_SIZE);
dst = gem_mmap(fd, handle, OBJECT_SIZE, PROT_READ);
igt_assert(dst != (uint32_t *)MAP_FAILED);
src = gem_mmap__cpu(fd, handle, OBJECT_SIZE, PROT_WRITE);
igt_assert(src != (uint32_t *)MAP_FAILED);
gem_close(fd, handle);
memset(src, 0xaa, OBJECT_SIZE);
igt_assert(memcmp(dst, src, OBJECT_SIZE) == 0);
munmap(src, OBJECT_SIZE);
munmap(dst, OBJECT_SIZE);
}
struct thread_fault_concurrent {
pthread_t thread;
int id;
@ -368,6 +393,8 @@ igt_main
run_without_prefault(fd, test_write);
igt_subtest("write-gtt-no-prefault")
run_without_prefault(fd, test_write_gtt);
igt_subtest("write-cpu-read-gtt")
test_write_cpu_read_gtt(fd);
igt_fixture
close(fd);