drm: dumb scanout create/mmap for intel/radeon (v3)
This is just an idea that might or might not be a good idea,
it basically adds two ioctls to create a dumb and map a dumb buffer
suitable for scanout. The handle can be passed to the KMS ioctls to create
a framebuffer.
It looks to me like it would be useful in the following cases:
a) in development drivers - we can always provide a shadowfb fallback.
b) libkms users - we can clean up libkms a lot and avoid linking
to libdrm_*.
c) plymouth via libkms is a lot easier.
Userspace bits would be just calls + mmaps. We could probably
mark these handles somehow as not being suitable for acceleartion
so as top stop people who are dumber than dumb.
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/include/drm/drm_mode.h b/include/drm/drm_mode.h
index 0fc7397..ae6b7a3 100644
--- a/include/drm/drm_mode.h
+++ b/include/drm/drm_mode.h
@@ -344,4 +344,33 @@
__u64 user_data;
};
+/* create a dumb scanout buffer */
+struct drm_mode_create_dumb {
+ uint32_t height;
+ uint32_t width;
+ uint32_t bpp;
+ uint32_t flags;
+ /* handle, pitch, size will be returned */
+ uint32_t handle;
+ uint32_t pitch;
+ uint64_t size;
+};
+
+/* set up for mmap of a dumb scanout buffer */
+struct drm_mode_map_dumb {
+ /** Handle for the object being mapped. */
+ __u32 handle;
+ __u32 pad;
+ /**
+ * Fake offset to use for subsequent mmap call
+ *
+ * This is a fixed-size type for 32/64 compatibility.
+ */
+ __u64 offset;
+};
+
+struct drm_mode_destroy_dumb {
+ uint32_t handle;
+};
+
#endif