Since commit 6b85aa68d9d5 ("drm: Enable PRIME import/export for all
drivers"), import/export is always supported. Document this so that
user-space knows what to expect.
Signed-off-by: Simon Ser <contact@xxxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
include/uapi/drm/drm.h | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index a87bbbbca2d4..56c194df527e 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -673,6 +673,9 @@ struct drm_gem_open {
* Bitfield of supported PRIME sharing capabilities. See &DRM_PRIME_CAP_IMPORT
* and &DRM_PRIME_CAP_EXPORT.
*
+ * Starting from kernel version 6.6, both &DRM_PRIME_CAP_IMPORT and
+ * &DRM_PRIME_CAP_EXPORT are always advertised.
+ *
* PRIME buffers are exposed as dma-buf file descriptors. See
* Documentation/gpu/drm-mm.rst, section "PRIME Buffer Sharing".
*/
@@ -682,6 +685,8 @@ struct drm_gem_open {
*
* If this bit is set in &DRM_CAP_PRIME, the driver supports importing PRIME
* buffers via the &DRM_IOCTL_PRIME_FD_TO_HANDLE ioctl.
+ *
+ * Starting from kernel version 6.6, this bit is always set in &DRM_CAP_PRIME.
*/
#define DRM_PRIME_CAP_IMPORT 0x1
/**
@@ -689,6 +694,8 @@ struct drm_gem_open {
*
* If this bit is set in &DRM_CAP_PRIME, the driver supports exporting PRIME
* buffers via the &DRM_IOCTL_PRIME_HANDLE_TO_FD ioctl.
+ *
+ * Starting from kernel version 6.6, this bit is always set in &DRM_CAP_PRIME.
*/
#define DRM_PRIME_CAP_EXPORT 0x2
/**
--
2.41.0
