vfio-ccw: Refactor ccw irq handler

Make it easier to add new ones in the future.

Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20200505125757.98209-5-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>

hw/vfio/ccw.c

@@ -324,22 +324,36 @@ read_err:
     css_inject_io_interrupt(sch);
 }
 
-static void vfio_ccw_register_io_notifier(VFIOCCWDevice *vcdev, Error **errp)
+static void vfio_ccw_register_irq_notifier(VFIOCCWDevice *vcdev,
+                                           unsigned int irq,
+                                           Error **errp)
 {
     VFIODevice *vdev = &vcdev->vdev;
     struct vfio_irq_info *irq_info;
     size_t argsz;
     int fd;
+    EventNotifier *notifier;
+    IOHandler *fd_read;
+
+    switch (irq) {
+    case VFIO_CCW_IO_IRQ_INDEX:
+        notifier = &vcdev->io_notifier;
+        fd_read = vfio_ccw_io_notifier_handler;
+        break;
+    default:
+        error_setg(errp, "vfio: Unsupported device irq(%d)", irq);
+        return;
+    }
 
-    if (vdev->num_irqs < VFIO_CCW_IO_IRQ_INDEX + 1) {
-        error_setg(errp, "vfio: unexpected number of io irqs %u",
+    if (vdev->num_irqs < irq + 1) {
+        error_setg(errp, "vfio: unexpected number of irqs %u",
                    vdev->num_irqs);
         return;
     }
 
     argsz = sizeof(*irq_info);
     irq_info = g_malloc0(argsz);
-    irq_info->index = VFIO_CCW_IO_IRQ_INDEX;
+    irq_info->index = irq;
     irq_info->argsz = argsz;
     if (ioctl(vdev->fd, VFIO_DEVICE_GET_IRQ_INFO,
               irq_info) < 0 || irq_info->count < 1) {
@@ -347,37 +361,49 @@ static void vfio_ccw_register_io_notifier(VFIOCCWDevice *vcdev, Error **errp)
         goto out_free_info;
     }
 
-    if (event_notifier_init(&vcdev->io_notifier, 0)) {
+    if (event_notifier_init(notifier, 0)) {
         error_setg_errno(errp, errno,
-                         "vfio: Unable to init event notifier for IO");
+                         "vfio: Unable to init event notifier for irq (%d)",
+                         irq);
         goto out_free_info;
     }
 
-    fd = event_notifier_get_fd(&vcdev->io_notifier);
-    qemu_set_fd_handler(fd, vfio_ccw_io_notifier_handler, NULL, vcdev);
+    fd = event_notifier_get_fd(notifier);
+    qemu_set_fd_handler(fd, fd_read, NULL, vcdev);
 
-    if (vfio_set_irq_signaling(vdev, VFIO_CCW_IO_IRQ_INDEX, 0,
+    if (vfio_set_irq_signaling(vdev, irq, 0,
                                VFIO_IRQ_SET_ACTION_TRIGGER, fd, errp)) {
         qemu_set_fd_handler(fd, NULL, NULL, vcdev);
-        event_notifier_cleanup(&vcdev->io_notifier);
+        event_notifier_cleanup(notifier);
     }
 
 out_free_info:
     g_free(irq_info);
 }
 
-static void vfio_ccw_unregister_io_notifier(VFIOCCWDevice *vcdev)
+static void vfio_ccw_unregister_irq_notifier(VFIOCCWDevice *vcdev,
+                                             unsigned int irq)
 {
     Error *err = NULL;
+    EventNotifier *notifier;
+
+    switch (irq) {
+    case VFIO_CCW_IO_IRQ_INDEX:
+        notifier = &vcdev->io_notifier;
+        break;
+    default:
+        error_report("vfio: Unsupported device irq(%d)", irq);
+        return;
+    }
 
-    if (vfio_set_irq_signaling(&vcdev->vdev, VFIO_CCW_IO_IRQ_INDEX, 0,
+    if (vfio_set_irq_signaling(&vcdev->vdev, irq, 0,
                                VFIO_IRQ_SET_ACTION_TRIGGER, -1, &err)) {
         error_reportf_err(err, VFIO_MSG_PREFIX, vcdev->vdev.name);
     }
 
-    qemu_set_fd_handler(event_notifier_get_fd(&vcdev->io_notifier),
+    qemu_set_fd_handler(event_notifier_get_fd(notifier),
                         NULL, NULL, vcdev);
-    event_notifier_cleanup(&vcdev->io_notifier);
+    event_notifier_cleanup(notifier);
 }
 
 static void vfio_ccw_get_region(VFIOCCWDevice *vcdev, Error **errp)
@@ -565,7 +591,7 @@ static void vfio_ccw_realize(DeviceState *dev, Error **errp)
         goto out_region_err;
     }
 
-    vfio_ccw_register_io_notifier(vcdev, &err);
+    vfio_ccw_register_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX, &err);
     if (err) {
         goto out_notifier_err;
     }
@@ -594,7 +620,7 @@ static void vfio_ccw_unrealize(DeviceState *dev)
     S390CCWDeviceClass *cdc = S390_CCW_DEVICE_GET_CLASS(cdev);
     VFIOGroup *group = vcdev->vdev.group;
 
-    vfio_ccw_unregister_io_notifier(vcdev);
+    vfio_ccw_unregister_irq_notifier(vcdev, VFIO_CCW_IO_IRQ_INDEX);
     vfio_ccw_put_region(vcdev);
     vfio_ccw_put_device(vcdev);
     vfio_put_group(group);