drm: DRM_I915_VBLANK_SWAP ioctl: Take drm_vblank_seq_type_t instead

of pipe number.

Handle relative as well as absolute target sequence numbers.

Return error if target sequence has already passed, so userspace can deal with
this situation as it sees fit.

On success, return the sequence number of the vertical blank when the buffer
swap is expected to take place.

Also add DRM_IOCTL_I915_VBLANK_SWAP definition for userspace code that may want
to use ioctl() instead of drmCommandWriteRead().

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/char/drm/i915_drm.h b/drivers/char/drm/i915_drm.h
index 8926beb5a61f..4ce3d16cf065 100644
--- a/drivers/char/drm/i915_drm.h
+++ b/drivers/char/drm/i915_drm.h
@@ -149,6 +149,7 @@ typedef struct _drm_i915_sarea {
 #define DRM_IOCTL_I915_DESTROY_HEAP     DRM_IOW( DRM_COMMAND_BASE + DRM_I915_DESTROY_HEAP, drm_i915_mem_destroy_heap_t)
 #define DRM_IOCTL_I915_SET_VBLANK_PIPE  DRM_IOW( DRM_COMMAND_BASE + DRM_I915_SET_VBLANK_PIPE, drm_i915_vblank_pipe_t)
 #define DRM_IOCTL_I915_GET_VBLANK_PIPE  DRM_IOR( DRM_COMMAND_BASE + DRM_I915_GET_VBLANK_PIPE, drm_i915_vblank_pipe_t)
+#define DRM_IOCTL_I915_VBLANK_SWAP      DRM_IOWR(DRM_COMMAND_BASE + DRM_I915_VBLANK_SWAP, drm_i915_vblank_swap_t)
 
 /* Allow drivers to submit batchbuffers directly to hardware, relying
  * on the security mechanisms provided by hardware.
@@ -248,7 +249,7 @@ typedef struct drm_i915_vblank_pipe {
  */
 typedef struct drm_i915_vblank_swap {
         drm_drawable_t drawable;
-        unsigned int pipe;
+        drm_vblank_seq_type_t seqtype;
         unsigned int sequence;
 } drm_i915_vblank_swap_t;