diff options
| author | Mika Kuoppala <[email protected]> | 2018-05-08 15:41:54 +0300 |
|---|---|---|
| committer | Mika Kuoppala <[email protected]> | 2018-05-11 15:52:21 +0300 |
| commit | ca6acc25250a1dc101c5a541b4f58bcc1dd65de5 (patch) | |
| tree | 5ea00e7451e98bc76727396ac843610d33d1d6b0 /tools/perf/scripts/python/compaction-times.py | |
| parent | 429204f1059909245d8f73b66aa729c6c2807cae (diff) | |
drm/i915/gtt: Trust the uncached store to flush wcb
Not all architectures guarantee that uncached read will
flush the write combining buffer. So marking it explicitly
is recommended [1].
However we know the architecture we are operating on
and can avoid wmb as the UC store will flush the wcb [2].
Omit the wmb() before invalidate as redudant.
v2: squash combining and removal (Chris)
v3: remove obsolete comments about posting reads (Chris)
References: http://yarchive.net/comp/linux/write_combining.html [1]
References: http://download.intel.com/design/PentiumII/applnots/24442201.pdf [2]
Cc: Chris Wilson <[email protected]>
Cc: Matthew Auld <[email protected]>
Signed-off-by: Mika Kuoppala <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Diffstat (limited to 'tools/perf/scripts/python/compaction-times.py')
0 files changed, 0 insertions, 0 deletions