sparc64: Add vio_set_intr() to enable/disable Rx interrupts

The vio_set_intr() API should be used by VIO consumers to enable/disable
Rx interrupts to facilitate deferred processing in softirq/bottom-half
context.
Signed-off-by: NSowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

arch/sparc/include/asm/vio.h

@@ -298,6 +298,7 @@ struct vio_dev {
 
 	unsigned int		tx_irq;
 	unsigned int		rx_irq;
+	u64			rx_ino;
 
 	struct device		dev;
 };
@@ -453,5 +454,6 @@ int vio_driver_init(struct vio_driver_state *vio, struct vio_dev *vdev,
 		    char *name);
 
 void vio_port_up(struct vio_driver_state *vio);
+int vio_set_intr(unsigned long dev_ino, int state);
 
 #endif /* _SPARC64_VIO_H */

arch/sparc/kernel/vio.c

@@ -180,8 +180,10 @@ static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
 			vdev->tx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
 
 		irq = mdesc_get_property(hp, target, "rx-ino", NULL);
-		if (irq)
+		if (irq) {
 			vdev->rx_irq = sun4v_build_virq(cdev_cfg_handle, *irq);
+			vdev->rx_ino = *irq;
+		}
 
 		chan_id = mdesc_get_property(hp, target, "id", NULL);
 		if (chan_id)
@@ -189,6 +191,15 @@ static void vio_fill_channel_info(struct mdesc_handle *hp, u64 mp,
 	}
 }
 
+int vio_set_intr(unsigned long dev_ino, int state)
+{
+	int err;
+
+	err = sun4v_vintr_set_valid(cdev_cfg_handle, dev_ino, state);
+	return err;
+}
+EXPORT_SYMBOL(vio_set_intr);
+
 static struct vio_dev *vio_create_one(struct mdesc_handle *hp, u64 mp,
 				      struct device *parent)
 {