[Intel-gfx] [PATCH 04/15] drm/i915: Cache the reset_counter for the request

[Chris Wilson]

On Tue, Dec 01, 2015 at 09:31:31AM +0100, Daniel Vetter wrote:
> On Sun, Nov 29, 2015 at 08:48:02AM +0000, Chris Wilson wrote:
> > Instead of querying the reset counter before every access to the ring,
> > query it the first time we touch the ring, and do a final compare when
> > submitting the request. For correctness, we need to then sanitize how
> > the reset_counter is incremented to prevent broken submission and
> > waiting across resets, in the process fixing the persistent -EIO we
> > still see today on failed waits.
> > 
> > v2: Rebase
> > v3: Now with added testcase
> > v4: Rebase
> > 
> > Testcase: igt/gem_eio
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> 
> Imo you really can't hide an ABI change in a refactor/optimize patch like
> this ... I really think moving check_wedge out of wait_request must be
> it's own little patch.

Urm, that is the essential part of the patch in this series.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre