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virtio: virtio_break_device() to mark all virtqueues broken.

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Good for post-apocalyptic scenarios, like S/390 hotplug.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2014-04-28 11:15:08 +09:30
parent ec6931b281
commit e2dcdfe95c
2 changed files with 17 additions and 0 deletions
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15
drivers/virtio/virtio_ring.c
View file

@ -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");

2
include/linux/virtio.h
View file

@ -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).