diff options
| author | Chris Wilson <chris@chris-wilson.co.uk> | 2011-11-30 11:59:31 +0000 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2011-11-30 12:08:39 +0000 |
| commit | 95f4da647a4055545b09cae0834df0fa2127a458 (patch) | |
| tree | 8282d153a75afe82a8017b0103b3d1d5a246e30b | |
| parent | ecd6cca617ac29cf2b1b2a4d33fca19b84fea2a9 (diff) | |
sna: Align pwrite to transfer whole cachelines
Daniel claims that this is will be faster, or will be once he has
completed rewriting pwrite!
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
| -rw-r--r-- | src/sna/kgem.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/src/sna/kgem.c b/src/sna/kgem.c index 58b9b67d..959f97ca 100644 --- a/src/sna/kgem.c +++ b/src/sna/kgem.c @@ -164,9 +164,16 @@ static int gem_write(int fd, uint32_t handle, VG_CLEAR(pwrite); pwrite.handle = handle; - pwrite.offset = offset; - pwrite.size = length; - pwrite.data_ptr = (uintptr_t)src; + /* align the transfer to cachelines; fortuitously this is safe! */ + if ((offset | length) & 63) { + pwrite.offset = offset & ~63; + pwrite.size = ALIGN(offset+length, 64) - pwrite.offset; + pwrite.data_ptr = (uintptr_t)src + pwrite.offset - offset; + } else { + pwrite.offset = offset; + pwrite.size = length; + pwrite.data_ptr = (uintptr_t)src; + } return drmIoctl(fd, DRM_IOCTL_I915_GEM_PWRITE, &pwrite); } |