[RFC PATCH v2 6/9] vfio-ccw: Refactor IRQ handlers

[Eric Farman <farman@xxxxxxxxxxxxx>]

To simplify future expansion.

Signed-off-by: Eric Farman <farman@xxxxxxxxxxxxx>
Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>
---

Notes:
    v1->v2:
     - Add Conny's r-b

 drivers/s390/cio/vfio_ccw_ops.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index edec0fb7ace8..f3033f8fc96d 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -391,17 +391,21 @@ static int vfio_ccw_mdev_get_region_info(struct vfio_region_info *info,
 
 static int vfio_ccw_mdev_get_irq_info(struct vfio_irq_info *info)
 {
-	if (info->index != VFIO_CCW_IO_IRQ_INDEX)
+	switch (info->index) {
+	case VFIO_CCW_IO_IRQ_INDEX:
+		info->count = 1;
+		info->flags = VFIO_IRQ_INFO_EVENTFD;
+		break;
+	default:
 		return -EINVAL;
-
-	info->count = 1;
-	info->flags = VFIO_IRQ_INFO_EVENTFD;
+	}
 
 	return 0;
 }
 
 static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
 				  uint32_t flags,
+				  uint32_t index,
 				  void __user *data)
 {
 	struct vfio_ccw_private *private;
@@ -411,7 +415,14 @@ static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
 		return -EINVAL;
 
 	private = dev_get_drvdata(mdev_parent_dev(mdev));
-	ctx = &private->io_trigger;
+
+	switch (index) {
+	case VFIO_CCW_IO_IRQ_INDEX:
+		ctx = &private->io_trigger;
+		break;
+	default:
+		return -EINVAL;
+	}
 
 	switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {
 	case VFIO_IRQ_SET_DATA_NONE:
@@ -583,7 +594,7 @@ static ssize_t vfio_ccw_mdev_ioctl(struct mdev_device *mdev,
 			return ret;
 
 		data = (void __user *)(arg + minsz);
-		return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, data);
+		return vfio_ccw_mdev_set_irqs(mdev, hdr.flags, hdr.index, data);
 	}
 	case VFIO_DEVICE_RESET:
 		return vfio_ccw_mdev_reset(mdev);
-- 
2.17.1