On 05.08.2016 10:15, Daniel Vetter wrote: Hi, > There's a driver cap DRM_CAP_DUMB_PREFER_SHADOW for this. If set, > render into a shadow buffer and copy over in bursts, otherwise you > can assume that the memory is fully cpu cached and fast with random > access. aaaah! nekrad@orion:~/src/linux$ git grep prefer_shadow drivers/gpu/drm/i915 drivers/gpu/drm/i915/intel_display.c: dev->mode_config.prefer_shadow = 1; IOW: i915 driver (my notebook here has an i915) sets that flag, so it seems my guess is right. Do we already have some suitable double-buffer helpers, which can detect changed regions and copy over in bursts, so userland doesn't need extra logic for that ? (hmm, maybe some cow + pagefault magic?) ... seems I need to give it some further thoughts ... --mtx _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
