On Wed, Apr 15, 2015 at 06:11:33PM +0100, Michel Thierry wrote: > WaIdleLiteRestore is an execlists-only workaround, and requires the driver > to ensure that any context always has HEAD!=TAIL when attempting lite > restore. > > Add two extra MI_NOOP instructions at the end of each request, but keep > the requests tail pointing before the MI_NOOPs. We may not need to > executed them, and this is why request->tail is sampled before adding > these extra instructions. > > If we submit a context to the ELSP which has previously been submitted, > move the tail pointer past the MI_NOOPs. This ensures HEAD!=TAIL. > > v2: Move overallocation to gen8_emit_request, and added note about > sampling request->tail in commit message (Chris). > > v3: Remove redundant request->tail assignment in __i915_add_request, in > lrc mode this is already set in execlists_context_queue. > Do not add wa implementation details inside gem (Chris). > > v4: Apply the wa whenever the req has been resubmitted and update > comment (Chris). > > Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Signed-off-by: Thomas Daniel <thomas.daniel@xxxxxxxxx> > Signed-off-by: Michel Thierry <michel.thierry@xxxxxxxxx> Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
