diff options
| -rw-r--r-- | tests/gem_mmap_gtt.c | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/tests/gem_mmap_gtt.c b/tests/gem_mmap_gtt.c index 2f05b932..c8819ad2 100644 --- a/tests/gem_mmap_gtt.c +++ b/tests/gem_mmap_gtt.c @@ -231,6 +231,56 @@ test_write(int fd) } static void +test_wc(int fd) +{ + unsigned long gtt_reads, gtt_writes, cpu_writes; + uint32_t handle; + void *gtt, *cpu; + + handle = gem_create(fd, 4096); + cpu = gem_mmap__cpu(fd, handle, 0, 4096, PROT_READ | PROT_WRITE); + gem_set_domain(fd, handle, I915_GEM_DOMAIN_CPU, I915_GEM_DOMAIN_CPU); + gem_close(fd, handle); + + handle = gem_create(fd, 4096); + gtt = gem_mmap__gtt(fd, handle, 4096, PROT_READ | PROT_WRITE); + gem_set_domain(fd, handle, I915_GEM_DOMAIN_GTT, I915_GEM_DOMAIN_GTT); + gem_close(fd, handle); + + gtt_reads = 0; + igt_until_timeout(1) { + memcpy(cpu, gtt, 4096); + gtt_reads++; + } + igt_debug("%lu GTT reads in 1s\n", gtt_reads); + + gtt_writes = 0; + igt_until_timeout(1) { + memcpy(cpu, gtt, 4096); + gtt_writes++; + } + igt_debug("%lu GTT writes in 1s\n", gtt_writes); + + cpu_writes = 0; + igt_until_timeout(1) { + memcpy(cpu, cpu, 4096); + cpu_writes++; + } + igt_debug("%lu CPU writes in 1s\n", cpu_writes); + + munmap(cpu, 4096); + munmap(gtt, 4096); + + igt_assert_f(gtt_writes > 2*gtt_reads, + "Write-Combined writes are expected to be much faster than reads: read=%.2fMiB/s, write=%.2fMiB/s\n", + gtt_reads/256., gtt_writes/256.); + + igt_assert_f(gtt_writes > cpu_writes/2, + "Write-Combined writes are expected to be roughly equivalent to WB writes: WC (gtt)=%.2fMiB/s, WB (cpu)=%.2fMiB/s\n", + gtt_writes/256., cpu_writes/256.); +} + +static void test_write_gtt(int fd) { uint32_t dst; @@ -610,6 +660,8 @@ igt_main run_without_prefault(fd, test_write_gtt); igt_subtest("basic-write-cpu-read-gtt") test_write_cpu_read_gtt(fd); + igt_subtest("basic-wc") + test_wc(fd); igt_subtest("basic-small-bo") test_huge_bo(fd, -1, I915_TILING_NONE); |