On Tue, Apr 10, 2012 at 10:35:19PM +0100, Chris Wilson wrote: > On Tue, 10 Apr 2012 11:52:50 +0100, Chris Wilson <chris at chris-wilson.co.uk> wrote: > > Similar to allowing a buffer to be simultaneously read by the GPU and > > through the GTT, we wish to allow readback of the pages through the CPU > > domain whilst they are also being read by the GPU. Domain coherency > > is managed by allowing multiple readers, but only a single writer. > > > > This is used by mesa for its program cache which it may search for every > > new program every frame and then renews should it need to add. During > > renewal, mesa copies the program bo currently executing through a CPU > > mapping onto the new bo. This patch allows the search and that copy to > > proceed without causing a stall on the current batch. > > At Daniel's request, I added i-g-t/gem_cpu_concurrent_blit to catch the > possible bugs that may have been introduced by this patch. Queued for -next, thanks for the patch. -Daniel -- Daniel Vetter Mail: daniel at ffwll.ch Mobile: +41 (0)79 365 57 48
