On Fri, Aug 14, 2015 at 06:43:30PM +0300, Imre Deak wrote: > Due to a coherency issue on BXT A steppings we can't guarantee a > coherent view of cached (CPU snooped) GPU mappings, so fail such > requests. User space is supposed to fall back to uncached mappings in > this case. > > v2: > - limit the WA to A steppings, on later stepping this HW issue is fixed > v3: > - return error instead of trying to work around the issue in kernel, > since that could confuse user space (Chris) > > Testcast: igt/gem_store_dword_batches_loop/cached-mapping > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx> I checked in the two userspaces where I have used snooping that both handle an error correctly, so 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
