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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2019-09-09 12:30:18 +0100 |
|---|---|---|
| committer | Chris Wilson <chris@chris-wilson.co.uk> | 2019-09-10 11:48:13 +0100 |
| commit | 0efa99dd58754d23e884b9ba41cd601f01b58c3d (patch) | |
| tree | a8b939d68da958d6b3d3688f04390b17cf20a4fb /tools/perf/scripts/python | |
| parent | 198d2533669bbe162e52eee2c35ddd8594967556 (diff) | |
| download | kernel-0efa99dd58754d23e884b9ba41cd601f01b58c3d.tar.gz | |
drm/i915/ringbuffer: Flush writes before RING_TAIL update
Be paranoid and make sure we flush any and all writes out of the WCB
before performing the UC mmio to update the RING_TAIL. (An UC write
should itself be enough to do the flush, hence the paranoia here.) Quite
infrequently, we see problems where the GPU seems to overshoot the
RING_TAIL and so executes garbage, hence the speculation.
References: https://bugs.freedesktop.org/show_bug.cgi?id=111598
References: https://bugs.freedesktop.org/show_bug.cgi?id=111417
References: https://bugs.freedesktop.org/show_bug.cgi?id=111034
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190909113018.13300-1-chris@chris-wilson.co.uk
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions