My past set of patches fix nouveau, radeon, and amdgpu breaking dma-buf sharing when trying to scanout of an imported PRIME buffer. Driver-agnostic userspace can't safely try to scanout of such a buffer, though, because the failure-mode is that subsequent rendering isn't shown on screen. This adds a DRM_CAP_PRIME_SCANOUT for userspace to detect when it's safe and sensible to try and scanout of an imported PRIME buffer. I know that i915 can do this, and nouveau/radeon/amdgpu can't (at the moment). I do not know which other drivers might be able to support the DRIVER_PRIME_SCANOUT feature. Suggestions welcome! _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
