| commit | 0efa99dd58754d23e884b9ba41cd601f01b58c3d | [log] [tgz] |
|---|---|---|
| author | Chris Wilson <chris@chris-wilson.co.uk> | Mon Sep 09 12:30:18 2019 +0100 |
| committer | Chris Wilson <chris@chris-wilson.co.uk> | Tue Sep 10 11:48:13 2019 +0100 |
| tree | a8b939d68da958d6b3d3688f04390b17cf20a4fb | |
| parent | 198d2533669bbe162e52eee2c35ddd8594967556 [diff] |
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