---

yaml
---
r: 163838
b: refs/heads/master
c: 8b92e87
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 4455e344959a217ffc28de2ab1af87541322b343
+refs/heads/master: 8b92e87d39bfd046e7581e1fe0f40eac40f88608

trunk/drivers/char/vt.c

@@ -252,7 +252,6 @@ static void notify_update(struct vc_data *vc)
 	struct vt_notifier_param param = { .vc = vc };
 	atomic_notifier_call_chain(&vt_notifier_list, VT_UPDATE, &param);
 }
-
 /*
  *	Low-Level Functions
  */
@@ -935,6 +934,7 @@ static int vc_do_resize(struct tty_struct *tty, struct vc_data *vc,
 
 	if (CON_IS_VISIBLE(vc))
 		update_screen(vc);
+	vt_event_post(VT_EVENT_RESIZE, vc->vc_num, vc->vc_num);
 	return err;
 }
 
@@ -3637,6 +3637,7 @@ void do_blank_screen(int entering_gfx)
 		blank_state = blank_vesa_wait;
 		mod_timer(&console_timer, jiffies + vesa_off_interval);
 	}
+	vt_event_post(VT_EVENT_BLANK, vc->vc_num, vc->vc_num);
 }
 EXPORT_SYMBOL(do_blank_screen);
 
@@ -3681,6 +3682,7 @@ void do_unblank_screen(int leaving_gfx)
 		console_blank_hook(0);
 	set_palette(vc);
 	set_cursor(vc);
+	vt_event_post(VT_EVENT_UNBLANK, vc->vc_num, vc->vc_num);
 }
 EXPORT_SYMBOL(do_unblank_screen);
 

trunk/drivers/char/vt_ioctl.c

@@ -61,6 +61,133 @@ extern struct tty_driver *console_driver;
 
 static void complete_change_console(struct vc_data *vc);
 
+/*
+ *	User space VT_EVENT handlers
+ */
+
+struct vt_event_wait {
+	struct list_head list;
+	struct vt_event event;
+	int done;
+};
+
+static LIST_HEAD(vt_events);
+static DEFINE_SPINLOCK(vt_event_lock);
+static DECLARE_WAIT_QUEUE_HEAD(vt_event_waitqueue);
+
+/**
+ *	vt_event_post
+ *	@event: the event that occurred
+ *	@old: old console
+ *	@new: new console
+ *
+ *	Post an VT event to interested VT handlers
+ */
+
+void vt_event_post(unsigned int event, unsigned int old, unsigned int new)
+{
+	struct list_head *pos, *head;
+	unsigned long flags;
+	int wake = 0;
+
+	spin_lock_irqsave(&vt_event_lock, flags);
+	head = &vt_events;
+
+	list_for_each(pos, head) {
+		struct vt_event_wait *ve = list_entry(pos,
+						struct vt_event_wait, list);
+		if (!(ve->event.event & event))
+			continue;
+		ve->event.event = event;
+		/* kernel view is consoles 0..n-1, user space view is
+		   console 1..n with 0 meaning current, so we must bias */
+		ve->event.old = old + 1;
+		ve->event.new = new + 1;
+		wake = 1;
+		ve->done = 1;
+	}
+	spin_unlock_irqrestore(&vt_event_lock, flags);
+	if (wake)
+		wake_up_interruptible(&vt_event_waitqueue);
+}
+
+/**
+ *	vt_event_wait		-	wait for an event
+ *	@vw: our event
+ *
+ *	Waits for an event to occur which completes our vt_event_wait
+ *	structure. On return the structure has wv->done set to 1 for success
+ *	or 0 if some event such as a signal ended the wait.
+ */
+
+static void vt_event_wait(struct vt_event_wait *vw)
+{
+	unsigned long flags;
+	/* Prepare the event */
+	INIT_LIST_HEAD(&vw->list);
+	vw->done = 0;
+	/* Queue our event */
+	spin_lock_irqsave(&vt_event_lock, flags);
+	list_add(&vw->list, &vt_events);
+	spin_unlock_irqrestore(&vt_event_lock, flags);
+	/* Wait for it to pass */
+	wait_event_interruptible(vt_event_waitqueue, vw->done);
+	/* Dequeue it */
+	spin_lock_irqsave(&vt_event_lock, flags);
+	list_del(&vw->list);
+	spin_unlock_irqrestore(&vt_event_lock, flags);
+}
+
+/**
+ *	vt_event_wait_ioctl	-	event ioctl handler
+ *	@arg: argument to ioctl
+ *
+ *	Implement the VT_WAITEVENT ioctl using the VT event interface
+ */
+
+static int vt_event_wait_ioctl(struct vt_event __user *event)
+{
+	struct vt_event_wait vw;
+
+	if (copy_from_user(&vw.event, event, sizeof(struct vt_event)))
+		return -EFAULT;
+	/* Highest supported event for now */
+	if (vw.event.event & ~VT_MAX_EVENT)
+		return -EINVAL;
+
+	vt_event_wait(&vw);
+	/* If it occurred report it */
+	if (vw.done) {
+		if (copy_to_user(event, &vw.event, sizeof(struct vt_event)))
+			return -EFAULT;
+		return 0;
+	}
+	return -EINTR;
+}
+
+/**
+ *	vt_waitactive	-	active console wait
+ *	@event: event code
+ *	@n: new console
+ *
+ *	Helper for event waits. Used to implement the legacy
+ *	event waiting ioctls in terms of events
+ */
+
+int vt_waitactive(int n)
+{
+	struct vt_event_wait vw;
+	do {
+		if (n == fg_console + 1)
+			break;
+		vw.event.event = VT_EVENT_SWITCH;
+		vt_event_wait(&vw);
+		if (vw.done == 0)
+			return -EINTR;
+	} while (vw.event.new != n);
+	return 0;
+}
+
 /*
  * these are the valid i/o ports we're allowed to change. they map all the
  * video ports
@@ -360,6 +487,8 @@ do_unimap_ioctl(int cmd, struct unimapdesc __user *user_ud, int perm, struct vc_
 	return 0;
 }
 
+
+
 /*
  * We handle the console-specific ioctl's here.  We allow the
  * capability to modify any console, not just the fg_console. 
@@ -851,7 +980,7 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
 		if (arg == 0 || arg > MAX_NR_CONSOLES)
 			ret = -ENXIO;
 		else
-			ret = vt_waitactive(arg - 1);
+			ret = vt_waitactive(arg);
 		break;
 
 	/*
@@ -1159,6 +1288,9 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
 		ret = put_user(vc->vc_hi_font_mask,
 					(unsigned short __user *)arg);
 		break;
+	case VT_WAITEVENT:
+		ret = vt_event_wait_ioctl((struct vt_event __user *)arg);
+		break;
 	default:
 		ret = -ENOIOCTLCMD;
 	}
@@ -1170,54 +1302,6 @@ int vt_ioctl(struct tty_struct *tty, struct file * file,
 	goto out;
 }
 
-/*
- * Sometimes we want to wait until a particular VT has been activated. We
- * do it in a very simple manner. Everybody waits on a single queue and
- * get woken up at once. Those that are satisfied go on with their business,
- * while those not ready go back to sleep. Seems overkill to add a wait
- * to each vt just for this - usually this does nothing!
- */
-static DECLARE_WAIT_QUEUE_HEAD(vt_activate_queue);
-
-/*
- * Sleeps until a vt is activated, or the task is interrupted. Returns
- * 0 if activation, -EINTR if interrupted by a signal handler.
- */
-int vt_waitactive(int vt)
-{
-	int retval;
-	DECLARE_WAITQUEUE(wait, current);
-
-	add_wait_queue(&vt_activate_queue, &wait);
-	for (;;) {
-		retval = 0;
-
-		/*
-		 * Synchronize with redraw_screen(). By acquiring the console
-		 * semaphore we make sure that the console switch is completed
-		 * before we return. If we didn't wait for the semaphore, we
-		 * could return at a point where fg_console has already been
-		 * updated, but the console switch hasn't been completed.
-		 */
-		acquire_console_sem();
-		set_current_state(TASK_INTERRUPTIBLE);
-		if (vt == fg_console) {
-			release_console_sem();
-			break;
-		}
-		release_console_sem();
-		retval = -ERESTARTNOHAND;
-		if (signal_pending(current))
-			break;
-		schedule();
-	}
-	remove_wait_queue(&vt_activate_queue, &wait);
-	__set_current_state(TASK_RUNNING);
-	return retval;
-}
-
-#define vt_wake_waitactive() wake_up(&vt_activate_queue)
-
 void reset_vc(struct vc_data *vc)
 {
 	vc->vc_mode = KD_TEXT;
@@ -1262,6 +1346,7 @@ void vc_SAK(struct work_struct *work)
 static void complete_change_console(struct vc_data *vc)
 {
 	unsigned char old_vc_mode;
+	int old = fg_console;
 
 	last_console = fg_console;
 
@@ -1325,7 +1410,7 @@ static void complete_change_console(struct vc_data *vc)
 	/*
 	 * Wake anyone waiting for their VT to activate
 	 */
-	vt_wake_waitactive();
+	vt_event_post(VT_EVENT_SWITCH, old, vc->vc_num);
 	return;
 }
 

trunk/include/linux/vt.h

@@ -74,4 +74,18 @@ struct vt_consize {
 #define VT_UNLOCKSWITCH 0x560C  /* allow vt switching */
 #define VT_GETHIFONTMASK 0x560D  /* return hi font mask */
 
+struct vt_event {
+	unsigned int event;
+#define VT_EVENT_SWITCH		0x0001	/* Console switch */
+#define VT_EVENT_BLANK		0x0002	/* Screen blank */
+#define VT_EVENT_UNBLANK	0x0004	/* Screen unblank */
+#define VT_EVENT_RESIZE		0x0008	/* Resize display */
+#define VT_MAX_EVENT		0x000F
+	unsigned int old;		/* Old console */
+	unsigned int new;		/* New console (if changing) */
+	unsigned int pad[4];		/* Padding for expansion */
+};
+
+#define VT_WAITEVENT	0x560E	/* Wait for an event */
+
 #endif /* _LINUX_VT_H */

trunk/include/linux/vt_kern.h

@@ -91,7 +91,8 @@ int con_copy_unimap(struct vc_data *dst_vc, struct vc_data *src_vc);
 #endif
 
 /* vt.c */
-int vt_waitactive(int vt);
+void vt_event_post(unsigned int event, unsigned int old, unsigned int new);
+int vt_waitactive(int n);
 void change_console(struct vc_data *new_vc);
 void reset_vc(struct vc_data *vc);
 extern int unbind_con_driver(const struct consw *csw, int first, int last,