drm: move to kref per-master structures.

This is step one towards having multiple masters sharing a drm
device in order to get fast-user-switching to work.

It splits out the information associated with the drm master
into a separate kref counted structure, and allocates this when
a master opens the device node. It also allows the current master
to abdicate (say while VT switched), and a new master to take over
the hardware.

It moves the Intel and radeon drivers to using the sarea from
within the new master structures.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/drm/drm.h b/include/drm/drm.h
index f46ba4b57da4..3fb173c5af3e 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -634,6 +634,9 @@ struct drm_gem_open {
 #define DRM_IOCTL_SET_SAREA_CTX         DRM_IOW( 0x1c, struct drm_ctx_priv_map)
 #define DRM_IOCTL_GET_SAREA_CTX         DRM_IOWR(0x1d, struct drm_ctx_priv_map)
 
+#define DRM_IOCTL_SET_MASTER            DRM_IO(0x1e)
+#define DRM_IOCTL_DROP_MASTER           DRM_IO(0x1f)
+
 #define DRM_IOCTL_ADD_CTX               DRM_IOWR(0x20, struct drm_ctx)
 #define DRM_IOCTL_RM_CTX                DRM_IOWR(0x21, struct drm_ctx)
 #define DRM_IOCTL_MOD_CTX               DRM_IOW( 0x22, struct drm_ctx)