libdrm/libdrm-page-flip.patch

diff --git a/libdrm/xf86drm.h b/libdrm/xf86drm.h
index c1d173c..67bea37 100644
--- a/libdrm/xf86drm.h
+++ b/libdrm/xf86drm.h
@@ -667,4 +667,22 @@ extern void drmMsg(const char *format, ...);
 extern int drmSetMaster(int fd);
 extern int drmDropMaster(int fd);
 
+#define DRM_EVENT_CONTEXT_VERSION 1
+
+typedef struct _drmEventContext {
+
+	/* This struct is versioned so we can add more pointers if we
+	 * add more events. */
+	int version;
+
+	void (*page_flip_handler)(int fd,
+				  unsigned int frame, 
+				  unsigned int tv_sec,
+				  unsigned int tv_usec,
+				  void *user_data);
+
+} drmEventContext, *drmEventContextPtr;
+
+extern int drmHandleEvent(int fd, drmEventContextPtr evctx);
+
 #endif
diff --git a/libdrm/xf86drmMode.c b/libdrm/xf86drmMode.c
index ea11207..f601a00 100644
--- a/libdrm/xf86drmMode.c
+++ b/libdrm/xf86drmMode.c
@@ -664,3 +664,56 @@ int drmModeCrtcSetGamma(int fd, uint32_t crtc_id, uint32_t size,
 
 	return 0;
 }
+
+int drmModePageFlip(int fd, uint32_t crtc_id, uint32_t fb_id, void *user_data)
+{
+	struct drm_mode_page_flip flip;
+
+	flip.fb_id = fb_id;
+	flip.crtc_id = crtc_id;
+	flip.user_data = VOID2U64(user_data);
+	flip.flags = 0;
+
+	return drmIoctl(fd, DRM_IOCTL_MODE_PAGE_FLIP, &flip);
+}
+
+int drmHandleEvent(int fd, drmEventContextPtr evctx)
+{
+	char buffer[1024];
+	int len, i;
+	struct drm_event *e;
+	struct drm_event_page_flip *page_flip;
+	
+	/* The DRM read semantics guarantees that we always get only
+	 * complete events. */
+
+	len = read(fd, buffer, sizeof buffer);
+	if (len == 0)
+		return 0;
+	if (len < sizeof *e)
+		return -1;
+
+	i = 0;
+	while (i < len) {
+		e = (struct drm_event *) &buffer[i];
+		switch (e->type) {
+		case DRM_EVENT_MODE_PAGE_FLIP:
+			if (evctx->version < 1 ||
+			    evctx->page_flip_handler == NULL)
+				break;
+			page_flip = (struct drm_event_page_flip *) e;
+			evctx->page_flip_handler(fd,
+						 page_flip->frame, 
+						 page_flip->tv_sec,
+						 page_flip->tv_usec,
+						 U642VOID (page_flip->user_data));
+			break;
+			
+		default:
+			break;
+		}
+		i += e->length;
+	}
+
+	return 0;
+}
diff --git a/libdrm/xf86drmMode.h b/libdrm/xf86drmMode.h
index 62304bb..fe64707 100644
--- a/libdrm/xf86drmMode.h
+++ b/libdrm/xf86drmMode.h
@@ -259,8 +259,6 @@ typedef struct _drmModeConnector {
 	uint32_t *encoders; /**< List of encoder ids */
 } drmModeConnector, *drmModeConnectorPtr;
 
-
-
 extern void drmModeFreeModeInfo( drmModeModeInfoPtr ptr );
 extern void drmModeFreeResources( drmModeResPtr ptr );
 extern void drmModeFreeFB( drmModeFBPtr ptr );
@@ -362,3 +360,4 @@ extern int drmModeCrtcSetGamma(int fd, uint32_t crtc_id, uint32_t size,
 			       uint16_t *red, uint16_t *green, uint16_t *blue);
 extern int drmModeCrtcGetGamma(int fd, uint32_t crtc_id, uint32_t size,
 			       uint16_t *red, uint16_t *green, uint16_t *blue);
+extern int drmModePageFlip(int fd, uint32_t crtc_id, uint32_t fb_id, void *user_data);
diff --git a/shared-core/drm.h b/shared-core/drm.h
index 97fab9a..8b504cb 100644
--- a/shared-core/drm.h
+++ b/shared-core/drm.h
@@ -1113,6 +1113,7 @@ struct drm_gem_open {
 #define DRM_IOCTL_MODE_GETFB		DRM_IOWR(0xAD, struct drm_mode_fb_cmd)
 #define DRM_IOCTL_MODE_ADDFB		DRM_IOWR(0xAE, struct drm_mode_fb_cmd)
 #define DRM_IOCTL_MODE_RMFB		DRM_IOWR(0xAF, uint32_t)
+#define DRM_IOCTL_MODE_PAGE_FLIP	DRM_IOW( 0xB0, struct drm_mode_page_flip)
 
 /*@}*/
 
@@ -1128,6 +1129,30 @@ struct drm_gem_open {
 #define DRM_COMMAND_BASE                0x40
 #define DRM_COMMAND_END                 0xA0
 
+/**
+ * Header for events written back to userspace on the drm fd.  The
+ * type defines the type of event, the length specifies the total
+ * length of the event (including the header), and user_data is
+ * typically a 64 bit value passed with the ioctl that triggered the
+ * event.  A read on the drm fd will always only return complete
+ * events, that is, if for example the read buffer is 100 bytes, and
+ * there are two 64 byte events pending, only one will be returned.
+ */
+struct drm_event {
+	uint32_t type;
+	uint32_t length;
+};
+
+#define DRM_EVENT_MODE_PAGE_FLIP 0x01
+
+struct drm_event_page_flip {
+	struct drm_event base;
+	uint64_t user_data;
+	uint32_t tv_sec;
+	uint32_t tv_usec;
+	uint32_t frame;
+};
+
 /* typedef area */
 #ifndef __KERNEL__
 typedef struct drm_clip_rect drm_clip_rect_t;
diff --git a/shared-core/drm_mode.h b/shared-core/drm_mode.h
index 9b92733..bebe4e7 100644
--- a/shared-core/drm_mode.h
+++ b/shared-core/drm_mode.h
@@ -270,4 +270,20 @@ struct drm_mode_crtc_lut {
 	uint64_t blue;
 };
 
+#define DRM_MODE_PAGE_FLIP_WAIT		(1<<0) /* block on previous page flip */
+#define DRM_MODE_PAGE_FLIP_FLAGS_MASK	(DRM_MODE_PAGE_FLIP_WAIT)
+
+struct drm_mode_page_flip {
+	/** Handle of new front buffer */
+	uint32_t fb_id;
+	uint32_t crtc_id;
+
+	/* 64 bit cookie returned to userspace in the page flip event. */
+	uint64_t user_data;
+	/**
+	 * page flip flags (wait on flip only for now)
+	 */
+	uint32_t flags;
+};
+
 #endif