Signed-off-by: Simon Ser <contact@xxxxxxxxxxx> Cc: Daniel Vetter <daniel@xxxxxxxx> Cc: Pekka Paalanen <ppaalanen@xxxxxxxxx> Cc: Daniel Stone <daniel@xxxxxxxxxxxxx> --- include/uapi/drm/drm.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h index 4cb956a52aee..54b2313c8332 100644 --- a/include/uapi/drm/drm.h +++ b/include/uapi/drm/drm.h @@ -1012,7 +1012,24 @@ extern "C" { #define DRM_IOCTL_UNLOCK DRM_IOW( 0x2b, struct drm_lock) #define DRM_IOCTL_FINISH DRM_IOW( 0x2c, struct drm_lock) +/** + * DRM_IOCTL_PRIME_HANDLE_TO_FD - Convert a GEM handle to a DMA-BUF FD. + * + * User-space sets &drm_prime_handle.handle with the GEM handle to export and + * &drm_prime_handle.flags, and gets back a DMA-BUF file descriptor in + * &drm_prime_handle.fd. + */ #define DRM_IOCTL_PRIME_HANDLE_TO_FD DRM_IOWR(0x2d, struct drm_prime_handle) +/** + * DRM_IOCTL_PRIME_FD_TO_HANDLE - Convert a DMA-BUF FD to a GEM handle. + * + * User-space sets &drm_prime_handle.fd with a DMA-BUF file descriptor to + * import, and gets back a GEM handle in &drm_prime_handle.handle. + * &drm_prime_handle.flags is unused. + * + * If an existing GEM handle refers to the memory object backing the DMA-BUF, + * that GEM handle is returned. + */ #define DRM_IOCTL_PRIME_FD_TO_HANDLE DRM_IOWR(0x2e, struct drm_prime_handle) #define DRM_IOCTL_AGP_ACQUIRE DRM_IO( 0x30) -- 2.39.1