drm: Remove infrastructure for supporting i915's vblank swapping.

It's not used in any other drivers, and doesn't look like it will be from
drm.git master.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/gpu/drm/drm_irq.c

@@ -280,8 +280,6 @@ int drm_irq_uninstall(struct drm_device * dev)
 
 	drm_vblank_cleanup(dev);
 
-	dev->locked_tasklet_func = NULL;
-
 	return 0;
 }
 EXPORT_SYMBOL(drm_irq_uninstall);
@@ -699,81 +697,3 @@ void drm_handle_vblank(struct drm_device *dev, int crtc)
 	drm_vbl_send_signals(dev, crtc);
 }
 EXPORT_SYMBOL(drm_handle_vblank);
-
-/**
- * Tasklet wrapper function.
- *
- * \param data DRM device in disguise.
- *
- * Attempts to grab the HW lock and calls the driver callback on success. On
- * failure, leave the lock marked as contended so the callback can be called
- * from drm_unlock().
- */
-static void drm_locked_tasklet_func(unsigned long data)
-{
-	struct drm_device *dev = (struct drm_device *)data;
-	unsigned long irqflags;
-	void (*tasklet_func)(struct drm_device *);
-	
-	spin_lock_irqsave(&dev->tasklet_lock, irqflags);
-	tasklet_func = dev->locked_tasklet_func;
-	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
-
-	if (!tasklet_func ||
-	    !drm_lock_take(&dev->lock,
-			   DRM_KERNEL_CONTEXT)) {
-		return;
-	}
-
-	dev->lock.lock_time = jiffies;
-	atomic_inc(&dev->counts[_DRM_STAT_LOCKS]);
-
-	spin_lock_irqsave(&dev->tasklet_lock, irqflags);
-	tasklet_func = dev->locked_tasklet_func;
-	dev->locked_tasklet_func = NULL;
-	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
-	
-	if (tasklet_func != NULL)
-		tasklet_func(dev);
-
-	drm_lock_free(&dev->lock,
-		      DRM_KERNEL_CONTEXT);
-}
-
-/**
- * Schedule a tasklet to call back a driver hook with the HW lock held.
- *
- * \param dev DRM device.
- * \param func Driver callback.
- *
- * This is intended for triggering actions that require the HW lock from an
- * interrupt handler. The lock will be grabbed ASAP after the interrupt handler
- * completes. Note that the callback may be called from interrupt or process
- * context, it must not make any assumptions about this. Also, the HW lock will
- * be held with the kernel context or any client context.
- */
-void drm_locked_tasklet(struct drm_device *dev, void (*func)(struct drm_device *))
-{
-	unsigned long irqflags;
-	static DECLARE_TASKLET(drm_tasklet, drm_locked_tasklet_func, 0);
-
-	if (!drm_core_check_feature(dev, DRIVER_HAVE_IRQ) ||
-	    test_bit(TASKLET_STATE_SCHED, &drm_tasklet.state))
-		return;
-
-	spin_lock_irqsave(&dev->tasklet_lock, irqflags);
-
-	if (dev->locked_tasklet_func) {
-		spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
-		return;
-	}
-
-	dev->locked_tasklet_func = func;
-
-	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
-
-	drm_tasklet.data = (unsigned long)dev;
-
-	tasklet_hi_schedule(&drm_tasklet);
-}
-EXPORT_SYMBOL(drm_locked_tasklet);

drivers/gpu/drm/drm_lock.c

@@ -154,8 +154,6 @@ int drm_lock(struct drm_device *dev, void *data, struct drm_file *file_priv)
 int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv)
 {
 	struct drm_lock *lock = data;
-	unsigned long irqflags;
-	void (*tasklet_func)(struct drm_device *);
 
 	if (lock->context == DRM_KERNEL_CONTEXT) {
 		DRM_ERROR("Process %d using kernel context %d\n",
@@ -163,13 +161,6 @@ int drm_unlock(struct drm_device *dev, void *data, struct drm_file *file_priv)
 		return -EINVAL;
 	}
 
-	spin_lock_irqsave(&dev->tasklet_lock, irqflags);
-	tasklet_func = dev->locked_tasklet_func;
-	dev->locked_tasklet_func = NULL;
-	spin_unlock_irqrestore(&dev->tasklet_lock, irqflags);
-	if (tasklet_func != NULL)
-		tasklet_func(dev);
-
 	atomic_inc(&dev->counts[_DRM_STAT_UNLOCKS]);
 
 	/* kernel_context_switch isn't used by any of the x86 drm

drivers/gpu/drm/drm_stub.c

@@ -92,7 +92,6 @@ static int drm_fill_in_dev(struct drm_device * dev, struct pci_dev *pdev,
 
 	spin_lock_init(&dev->count_lock);
 	spin_lock_init(&dev->drw_lock);
-	spin_lock_init(&dev->tasklet_lock);
 	spin_lock_init(&dev->lock.spinlock);
 	init_timer(&dev->timer);
 	mutex_init(&dev->struct_mutex);

include/drm/drmP.h

@@ -861,8 +861,6 @@ struct drm_device {
 	struct timer_list vblank_disable_timer;
 
 	u32 max_vblank_count;           /**< size of vblank counter register */
-	spinlock_t tasklet_lock;	/**< For drm_locked_tasklet */
-	void (*locked_tasklet_func)(struct drm_device *dev);
 
 	/*@} */
 	cycles_t ctx_start;
@@ -1149,8 +1147,6 @@ extern int drm_vblank_init(struct drm_device *dev, int num_crtcs);
 extern int drm_wait_vblank(struct drm_device *dev, void *data,
 			   struct drm_file *filp);
 extern int drm_vblank_wait(struct drm_device *dev, unsigned int *vbl_seq);
-extern void drm_locked_tasklet(struct drm_device *dev,
-			       void(*func)(struct drm_device *));
 extern u32 drm_vblank_count(struct drm_device *dev, int crtc);
 extern void drm_handle_vblank(struct drm_device *dev, int crtc);
 extern int drm_vblank_get(struct drm_device *dev, int crtc);
@@ -1158,7 +1154,6 @@ extern void drm_vblank_put(struct drm_device *dev, int crtc);
 /* Modesetting support */
 extern int drm_modeset_ctl(struct drm_device *dev, void *data,
 			   struct drm_file *file_priv);
-extern void drm_locked_tasklet(struct drm_device *dev, void(*func)(struct drm_device*));
 
 				/* AGP/GART support (drm_agpsupport.h) */
 extern struct drm_agp_head *drm_agp_init(struct drm_device *dev);