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authorRusty Russell <rusty@rustcorp.com.au>2014-04-28 11:15:08 +0930
committerRusty Russell <rusty@rustcorp.com.au>2014-04-28 11:34:13 +0930
commite2dcdfe95c0bd67e37db6057edd9c4ee1f1c7b17 (patch)
treed6e0676596a6f906362d836a08e4629dc9442fdd
parentec6931b281797b69e6cf109f9cc94d5a2bf994e0 (diff)
downloadop-kernel-dev-e2dcdfe95c0bd67e37db6057edd9c4ee1f1c7b17.zip
op-kernel-dev-e2dcdfe95c0bd67e37db6057edd9c4ee1f1c7b17.tar.gz
virtio: virtio_break_device() to mark all virtqueues broken.
Good for post-apocalyptic scenarios, like S/390 hotplug. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
-rw-r--r--drivers/virtio/virtio_ring.c15
-rw-r--r--include/linux/virtio.h2
2 files changed, 17 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 1e44362..4d08f45a 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -865,4 +865,19 @@ bool virtqueue_is_broken(struct virtqueue *_vq)
}
EXPORT_SYMBOL_GPL(virtqueue_is_broken);
+/*
+ * This should prevent the device from being used, allowing drivers to
+ * recover. You may need to grab appropriate locks to flush.
+ */
+void virtio_break_device(struct virtio_device *dev)
+{
+ struct virtqueue *_vq;
+
+ list_for_each_entry(_vq, &dev->vqs, list) {
+ struct vring_virtqueue *vq = to_vvq(_vq);
+ vq->broken = true;
+ }
+}
+EXPORT_SYMBOL_GPL(virtio_break_device);
+
MODULE_LICENSE("GPL");
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index e4abb84..b46671e 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -106,6 +106,8 @@ static inline struct virtio_device *dev_to_virtio(struct device *_dev)
int register_virtio_device(struct virtio_device *dev);
void unregister_virtio_device(struct virtio_device *dev);
+void virtio_break_device(struct virtio_device *dev);
+
/**
* virtio_driver - operations for a virtio I/O driver
* @driver: underlying device driver (populate name and owner).
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