Re: [Intel-gfx] [PATCH v3 2/2] drm/i915/bxt: don't allow cached GEM mappings on A stepping
On Fri, Aug 14, 2015 at 05:18:27PM +0100, Chris Wilson wrote: > 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 > > I checked in the two userspaces where I have used snooping that both > handle an error correctly, so > > Reviewed-by: Chris Wilson Both patches applied, thanks. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
Re: [Intel-gfx] [PATCH v3 2/2] drm/i915/bxt: don't allow cached GEM mappings on A stepping
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 I checked in the two userspaces where I have used snooping that both handle an error correctly, so Reviewed-by: Chris Wilson -Chris -- Chris Wilson, Intel Open Source Technology Centre ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/intel-gfx
