virtio-mmio: implement synchronize_cbs()

Simply synchronize the platform irq that is used by us.

Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Halil Pasic <pasic@linux.ibm.com>
Cc: Cornelia Huck <cohuck@redhat.com>
Cc: Vineeth Vijayan <vneethv@linux.ibm.com>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Cc: linux-s390@vger.kernel.org
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220527060120.20964-6-jasowang@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>

diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index 839684d..c9699a5 100644 (file)
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -345,6 +345,13 @@ static void vm_del_vqs(struct virtio_device *vdev)
        free_irq(platform_get_irq(vm_dev->pdev, 0), vm_dev);
 }
 
+static void vm_synchronize_cbs(struct virtio_device *vdev)
+{
+       struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
+
+       synchronize_irq(platform_get_irq(vm_dev->pdev, 0));
+}
+
 static struct virtqueue *vm_setup_vq(struct virtio_device *vdev, unsigned int index,
                                  void (*callback)(struct virtqueue *vq),
                                  const char *name, bool ctx)
@@ -541,6 +548,7 @@ static const struct virtio_config_ops virtio_mmio_config_ops = {
        .finalize_features = vm_finalize_features,
        .bus_name       = vm_bus_name,
        .get_shm_region = vm_get_shm_region,
+       .synchronize_cbs = vm_synchronize_cbs,
 };