2 files changed, 57 insertions, 2 deletions

diff --git a/include/drm/drm.h b/include/drm/drm.h
index 7cb50bdde46d..fa6d9155873d 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -454,6 +454,7 @@ struct drm_irq_busid {
 enum drm_vblank_seq_type {
         _DRM_VBLANK_ABSOLUTE = 0x0,     /**< Wait for specific vblank sequence number */
         _DRM_VBLANK_RELATIVE = 0x1,     /**< Wait for given number of vblanks */
+        _DRM_VBLANK_EVENT = 0x4000000,   /**< Send event instead of blocking */
         _DRM_VBLANK_FLIP = 0x8000000,   /**< Scheduled buffer swap should flip */
         _DRM_VBLANK_NEXTONMISS = 0x10000000,    /**< If missed, wait for next vblank */
         _DRM_VBLANK_SECONDARY = 0x20000000,     /**< Secondary display controller */
@@ -461,8 +462,8 @@ enum drm_vblank_seq_type {
 };
 
 #define _DRM_VBLANK_TYPES_MASK (_DRM_VBLANK_ABSOLUTE | _DRM_VBLANK_RELATIVE)
-#define _DRM_VBLANK_FLAGS_MASK (_DRM_VBLANK_SIGNAL | _DRM_VBLANK_SECONDARY | \
-                                _DRM_VBLANK_NEXTONMISS)
+#define _DRM_VBLANK_FLAGS_MASK (_DRM_VBLANK_EVENT | _DRM_VBLANK_SIGNAL | \
+                                _DRM_VBLANK_SECONDARY | _DRM_VBLANK_NEXTONMISS)
 
 struct drm_wait_vblank_request {
         enum drm_vblank_seq_type type;
@@ -698,6 +699,34 @@ 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.
+ *
+ * Event types 0 - 0x7fffffff are generic drm events, 0x80000000 and
+ * up are chipset specific.
+ */
+struct drm_event {
+        __u32 type;
+        __u32 length;
+};
+
+#define DRM_EVENT_VBLANK 0x01
+
+struct drm_event_vblank {
+        struct drm_event base;
+        __u64 user_data;
+        __u32 tv_sec;
+        __u32 tv_usec;
+        __u32 sequence;
+        __u32 reserved;
+};
+
 /* typedef area */
 #ifndef __KERNEL__
 typedef struct drm_clip_rect drm_clip_rect_t;
diff --git a/include/drm/drmP.h b/include/drm/drmP.h
index c8e64bbadbcf..b0b36838ab11 100644
--- a/include/drm/drmP.h
+++ b/include/drm/drmP.h
@@ -426,6 +426,14 @@ struct drm_buf_entry {
         struct drm_freelist freelist;
 };
 
+/* Event queued up for userspace to read */
+struct drm_pending_event {
+        struct drm_event *event;
+        struct list_head link;
+        struct drm_file *file_priv;
+        void (*destroy)(struct drm_pending_event *event);
+};
+
 /** File private data */
 struct drm_file {
         int authenticated;
@@ -449,6 +457,10 @@ struct drm_file {
         struct drm_master *master; /* master this node is currently associated with
                                       N.B. not always minor->master */
         struct list_head fbs;
+
+        wait_queue_head_t event_wait;
+        struct list_head event_list;
+        int event_space;
 };
 
 /** Wait queue */
@@ -900,6 +912,12 @@ struct drm_minor {
         struct drm_mode_group mode_group;
 };
 
+struct drm_pending_vblank_event {
+        struct drm_pending_event base;
+        int pipe;
+        struct drm_event_vblank event;
+};
+
 /**
  * DRM device structure. This structure represent a complete card that
  * may contain multiple heads.
@@ -999,6 +1017,12 @@ struct drm_device {
 
         u32 max_vblank_count;           /**< size of vblank counter register */
 
+        /**
+         * List of events
+         */
+        struct list_head vblank_event_list;
+        spinlock_t event_lock;
+
         /*@} */
         cycles_t ctx_start;
         cycles_t lck_start;
@@ -1135,6 +1159,8 @@ extern int drm_lastclose(struct drm_device *dev);
 extern int drm_open(struct inode *inode, struct file *filp);
 extern int drm_stub_open(struct inode *inode, struct file *filp);
 extern int drm_fasync(int fd, struct file *filp, int on);
+extern ssize_t drm_read(struct file *filp, char __user *buffer,
+                        size_t count, loff_t *offset);
 extern int drm_release(struct inode *inode, struct file *filp);
 
                                 /* Mapping support (drm_vm.h) */