diff options
Diffstat (limited to 'tests/prime_vgem.c')
| -rw-r--r-- | tests/prime_vgem.c | 41 |
1 files changed, 36 insertions, 5 deletions
diff --git a/tests/prime_vgem.c b/tests/prime_vgem.c index 95557ef9..0ffaee90 100644 --- a/tests/prime_vgem.c +++ b/tests/prime_vgem.c @@ -203,7 +203,7 @@ static void test_gtt(int vgem, int i915) { struct vgem_bo scratch; uint32_t handle; - uint32_t *ptr, *gtt; + uint32_t *ptr; int dmabuf, i; scratch.width = 1024; @@ -232,18 +232,46 @@ static void test_gtt(int vgem, int i915) igt_assert_eq(ptr[1024*i], ~i); munmap(ptr, scratch.size); + gem_close(i915, handle); + gem_close(vgem, scratch.handle); +} + +static void test_gtt_interleaved(int vgem, int i915) +{ + struct vgem_bo scratch; + uint32_t handle; + uint32_t *ptr, *gtt; + int dmabuf, i; + + scratch.width = 1024; + scratch.height = 1024; + scratch.bpp = 32; + vgem_create(vgem, &scratch); + + dmabuf = prime_handle_to_fd(vgem, scratch.handle); + handle = prime_fd_to_handle(i915, dmabuf); + close(dmabuf); + + /* This assumes that GTT is perfectedly coherent. On certain machines, + * it is possible for a direct acces to bypass the GTT indirection. + * + * This test may fail. It tells us how far userspace can trust + * concurrent dmabuf/i915 access. In the future, we may have a kernel + * param to indicate whether or not this interleaving is possible. + * However, the mmaps may be passed around to third parties that do + * not know about the shortcommings... + */ ptr = vgem_mmap(vgem, &scratch, PROT_WRITE); gtt = gem_mmap__gtt(i915, handle, scratch.size, PROT_WRITE); -#if defined(__x86_64__) for (i = 0; i < 1024; i++) { gtt[1024*i] = i; - __builtin_ia32_sfence(); + /* The read from WC should act as a flush for the GTT wcb */ igt_assert_eq(ptr[1024*i], i); + ptr[1024*i] = ~i; - __builtin_ia32_sfence(); + /* The read from GTT should act as a flush for the WC wcb */ igt_assert_eq(gtt[1024*i], ~i); } -#endif munmap(gtt, scratch.size); munmap(ptr, scratch.size); @@ -753,6 +781,9 @@ igt_main igt_subtest("basic-gtt") test_gtt(vgem, i915); + igt_subtest("coherency-gtt") + test_gtt_interleaved(vgem, i915); + for (e = intel_execution_engines; e->name; e++) { igt_subtest_f("%ssync-%s", e->exec_id == 0 ? "basic-" : "", |