On 6/20/2023 1:59 AM, Thomas Zimmermann wrote:
Call drm_gem_prime_handle_to_fd() and drm_gem_prime_fd_to_handle() by default if no PRIME import/export helpers have been set. Both functions are the default for almost all drivers. DRM drivers implement struct drm_driver.gem_prime_import_sg_table to import dma-buf objects from other drivers. Having the function drm_gem_prime_fd_to_handle() functions set by default allows each driver to import dma-buf objects to itself, even without support for other drivers. For drm_gem_prime_handle_to_fd() it is similar: using it by default allows each driver to export to itself, even without support for other drivers. This functionality enables userspace to share per-driver buffers across process boundaries via PRIME (e.g., wlroots requires this functionality). The patch generalizes a pattern that has previously been implemented by GEM VRAM helpers [1] to work with any driver. For example, gma500 can now run the wlroots-based sway compositor. v2: * clean up docs and TODO comments (Simon, Zack) * clean up style in drm_getcap() Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx> Link: https://lore.kernel.org/dri-devel/20230302143502.500661-1-contact@xxxxxxxxxxx/ # 1 Reviewed-by: Simon Ser <contact@xxxxxxxxxxx> Acked-by: Alex Deucher <alexander.deucher@xxxxxxx>
Reviewed-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx>
