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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2016-10-22 10:46:41 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2016-10-22 10:47:07 +0100 |
| commit | 93437cba7fc87755dd27b4acdc021107301fbe8c (patch) | |
| tree | 57a99dbc7cd01b685cc5118a7611c8600d241a2a /tests | |
| parent | 79de3ddc1564d414a49e5d179fb3bf5577955e8e (diff) | |
igt/gem_mmap_gtt: Document the "expected" behaviour
References: https://bugs.freedesktop.org/show_bug.cgi?id=9431
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'tests')
| -rw-r--r-- | tests/gem_mmap_gtt.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tests/gem_mmap_gtt.c b/tests/gem_mmap_gtt.c index 60034df3..cb79aeca 100644 --- a/tests/gem_mmap_gtt.c +++ b/tests/gem_mmap_gtt.c @@ -321,6 +321,10 @@ test_coherency(int fd) cpu = gem_mmap__cpu(fd, handle, 0, OBJECT_SIZE, PROT_READ | PROT_WRITE); set_domain_gtt(fd, handle); + /* On byt/bsw/bxt this detects an interesting behaviour where the + * CPU cannot flush the iobar and so the read may bypass the write. + * https://bugs.freedesktop.org/show_bug.cgi?id=94314 + */ for (i = 0; i < OBJECT_SIZE / 64; i++) { int x = 16*i + (i%16); gtt[x] = i; |