Merge branch 'vmwgfx-next' of git://people.freedesktop.org/~thomash/linux into drm-next

One is fix for a regression in 4.3, One irq locking rework.

* 'vmwgfx-next' of git://people.freedesktop.org/~thomash/linux:
  drm/vmwgfx: Relax irq locking somewhat
  drm/vmwgfx: Properly flush cursor updates and page-flips

drivers/gpu/drm/vmwgfx/vmwgfx_drv.c

@@ -643,7 +643,7 @@ static int vmw_driver_load(struct drm_device *dev, unsigned long chipset)
 	init_waitqueue_head(&dev_priv->fence_queue);
 	init_waitqueue_head(&dev_priv->fifo_queue);
 	dev_priv->fence_queue_waiters = 0;
-	atomic_set(&dev_priv->fifo_queue_waiters, 0);
+	dev_priv->fifo_queue_waiters = 0;
 
 	dev_priv->used_memory_size = 0;
 

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

@@ -440,13 +440,12 @@ struct vmw_private {
 	spinlock_t waiter_lock;
 	int fence_queue_waiters; /* Protected by waiter_lock */
 	int goal_queue_waiters; /* Protected by waiter_lock */
-	int cmdbuf_waiters; /* Protected by irq_lock */
-	int error_waiters; /* Protected by irq_lock */
-	atomic_t fifo_queue_waiters;
+	int cmdbuf_waiters; /* Protected by waiter_lock */
+	int error_waiters; /* Protected by waiter_lock */
+	int fifo_queue_waiters; /* Protected by waiter_lock */
 	uint32_t last_read_seqno;
-	spinlock_t irq_lock;
 	struct vmw_fence_manager *fman;
-	uint32_t irq_mask;
+	uint32_t irq_mask; /* Updates protected by waiter_lock */
 
 	/*
 	 * Device state

drivers/gpu/drm/vmwgfx/vmwgfx_fifo.c

@@ -252,7 +252,6 @@ static int vmw_fifo_wait(struct vmw_private *dev_priv,
 			 unsigned long timeout)
 {
 	long ret = 1L;
-	unsigned long irq_flags;
 
 	if (likely(!vmw_fifo_is_full(dev_priv, bytes)))
 		return 0;
@@ -262,16 +261,8 @@ static int vmw_fifo_wait(struct vmw_private *dev_priv,
 		return vmw_fifo_wait_noirq(dev_priv, bytes,
 					   interruptible, timeout);
 
-	spin_lock(&dev_priv->waiter_lock);
-	if (atomic_add_return(1, &dev_priv->fifo_queue_waiters) > 0) {
-		spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
-		outl(SVGA_IRQFLAG_FIFO_PROGRESS,
-		     dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
-		dev_priv->irq_mask |= SVGA_IRQFLAG_FIFO_PROGRESS;
-		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
-		spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
-	}
-	spin_unlock(&dev_priv->waiter_lock);
+	vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_FIFO_PROGRESS,
+			       &dev_priv->fifo_queue_waiters);
 
 	if (interruptible)
 		ret = wait_event_interruptible_timeout
@@ -287,14 +278,8 @@ static int vmw_fifo_wait(struct vmw_private *dev_priv,
 	else if (likely(ret > 0))
 		ret = 0;
 
-	spin_lock(&dev_priv->waiter_lock);
-	if (atomic_dec_and_test(&dev_priv->fifo_queue_waiters)) {
-		spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
-		dev_priv->irq_mask &= ~SVGA_IRQFLAG_FIFO_PROGRESS;
-		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
-		spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
-	}
-	spin_unlock(&dev_priv->waiter_lock);
+	vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_FIFO_PROGRESS,
+				  &dev_priv->fifo_queue_waiters);
 
 	return ret;
 }

drivers/gpu/drm/vmwgfx/vmwgfx_irq.c

@@ -36,15 +36,13 @@ irqreturn_t vmw_irq_handler(int irq, void *arg)
 	struct vmw_private *dev_priv = vmw_priv(dev);
 	uint32_t status, masked_status;
 
-	spin_lock(&dev_priv->irq_lock);
 	status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
-	masked_status = status & dev_priv->irq_mask;
-	spin_unlock(&dev_priv->irq_lock);
+	masked_status = status & READ_ONCE(dev_priv->irq_mask);
 
 	if (likely(status))
 		outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 
-	if (!masked_status)
+	if (!status)
 		return IRQ_NONE;
 
 	if (masked_status & (SVGA_IRQFLAG_ANY_FENCE |
@@ -190,65 +188,51 @@ int vmw_fallback_wait(struct vmw_private *dev_priv,
 	return ret;
 }
 
-void vmw_seqno_waiter_add(struct vmw_private *dev_priv)
+void vmw_generic_waiter_add(struct vmw_private *dev_priv,
+			    u32 flag, int *waiter_count)
 {
-	spin_lock(&dev_priv->waiter_lock);
-	if (dev_priv->fence_queue_waiters++ == 0) {
-		unsigned long irq_flags;
-
-		spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
-		outl(SVGA_IRQFLAG_ANY_FENCE,
-		     dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
-		dev_priv->irq_mask |= SVGA_IRQFLAG_ANY_FENCE;
+	spin_lock_bh(&dev_priv->waiter_lock);
+	if ((*waiter_count)++ == 0) {
+		outl(flag, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
+		dev_priv->irq_mask |= flag;
 		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
-		spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 	}
-	spin_unlock(&dev_priv->waiter_lock);
+	spin_unlock_bh(&dev_priv->waiter_lock);
 }
 
-void vmw_seqno_waiter_remove(struct vmw_private *dev_priv)
+void vmw_generic_waiter_remove(struct vmw_private *dev_priv,
+			       u32 flag, int *waiter_count)
 {
-	spin_lock(&dev_priv->waiter_lock);
-	if (--dev_priv->fence_queue_waiters == 0) {
-		unsigned long irq_flags;
-
-		spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
-		dev_priv->irq_mask &= ~SVGA_IRQFLAG_ANY_FENCE;
+	spin_lock_bh(&dev_priv->waiter_lock);
+	if (--(*waiter_count) == 0) {
+		dev_priv->irq_mask &= ~flag;
 		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
-		spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
 	}
-	spin_unlock(&dev_priv->waiter_lock);
+	spin_unlock_bh(&dev_priv->waiter_lock);
 }
 
+void vmw_seqno_waiter_add(struct vmw_private *dev_priv)
+{
+	vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_ANY_FENCE,
+			       &dev_priv->fence_queue_waiters);
+}
+
+void vmw_seqno_waiter_remove(struct vmw_private *dev_priv)
+{
+	vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_ANY_FENCE,
+				  &dev_priv->fence_queue_waiters);
+}
 
 void vmw_goal_waiter_add(struct vmw_private *dev_priv)
 {
-	spin_lock(&dev_priv->waiter_lock);
-	if (dev_priv->goal_queue_waiters++ == 0) {
-		unsigned long irq_flags;
-
-		spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
-		outl(SVGA_IRQFLAG_FENCE_GOAL,
-		     dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
-		dev_priv->irq_mask |= SVGA_IRQFLAG_FENCE_GOAL;
-		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
-		spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
-	}
-	spin_unlock(&dev_priv->waiter_lock);
+	vmw_generic_waiter_add(dev_priv, SVGA_IRQFLAG_FENCE_GOAL,
+			       &dev_priv->goal_queue_waiters);
 }
 
 void vmw_goal_waiter_remove(struct vmw_private *dev_priv)
 {
-	spin_lock(&dev_priv->waiter_lock);
-	if (--dev_priv->goal_queue_waiters == 0) {
-		unsigned long irq_flags;
-
-		spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
-		dev_priv->irq_mask &= ~SVGA_IRQFLAG_FENCE_GOAL;
-		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
-		spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
-	}
-	spin_unlock(&dev_priv->waiter_lock);
+	vmw_generic_waiter_remove(dev_priv, SVGA_IRQFLAG_FENCE_GOAL,
+				  &dev_priv->goal_queue_waiters);
 }
 
 int vmw_wait_seqno(struct vmw_private *dev_priv,
@@ -305,7 +289,6 @@ void vmw_irq_preinstall(struct drm_device *dev)
 	if (!(dev_priv->capabilities & SVGA_CAP_IRQMASK))
 		return;
 
-	spin_lock_init(&dev_priv->irq_lock);
 	status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 	outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 }
@@ -328,30 +311,3 @@ void vmw_irq_uninstall(struct drm_device *dev)
 	status = inl(dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 	outl(status, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
 }
-
-void vmw_generic_waiter_add(struct vmw_private *dev_priv,
-			    u32 flag, int *waiter_count)
-{
-	unsigned long irq_flags;
-
-	spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
-	if ((*waiter_count)++ == 0) {
-		outl(flag, dev_priv->io_start + VMWGFX_IRQSTATUS_PORT);
-		dev_priv->irq_mask |= flag;
-		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
-	}
-	spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
-}
-
-void vmw_generic_waiter_remove(struct vmw_private *dev_priv,
-			       u32 flag, int *waiter_count)
-{
-	unsigned long irq_flags;
-
-	spin_lock_irqsave(&dev_priv->irq_lock, irq_flags);
-	if (--(*waiter_count) == 0) {
-		dev_priv->irq_mask &= ~flag;
-		vmw_write(dev_priv, SVGA_REG_IRQMASK, dev_priv->irq_mask);
-	}
-	spin_unlock_irqrestore(&dev_priv->irq_lock, irq_flags);
-}

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -78,7 +78,7 @@ int vmw_cursor_update_image(struct vmw_private *dev_priv,
 	cmd->cursor.hotspotX = hotspotX;
 	cmd->cursor.hotspotY = hotspotY;
 
-	vmw_fifo_commit(dev_priv, cmd_size);
+	vmw_fifo_commit_flush(dev_priv, cmd_size);
 
 	return 0;
 }

drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c

@@ -717,6 +717,8 @@ static int vmw_stdu_crtc_page_flip(struct drm_crtc *crtc,
 						   &event->event.tv_usec,
 						   true);
 		vmw_fence_obj_unreference(&fence);
+	} else {
+		vmw_fifo_flush(dev_priv, false);
 	}
 
 	return ret;