This patch introduce a new virtio config ops to vring callbacks. Transport specific method is required to call synchornize_irq() on the IRQs. For the transport that doesn't provide synchronize_vqs(), use synchornize_rcu() as a fallback.
Cc: Thomas Gleixner <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: "Paul E. McKenney" <[email protected]> Cc: Marc Zyngier <[email protected]> Signed-off-by: Jason Wang <[email protected]> --- include/linux/virtio_config.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index b341dd62aa4d..08b73d9bbff2 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -57,6 +57,8 @@ struct virtio_shm_region { * include a NULL entry for vqs unused by driver * Returns 0 on success or error status * @del_vqs: free virtqueues found by find_vqs(). + * @synchronize_vqs: synchronize with the virtqueue callbacks. + * vdev: the virtio_device * @get_features: get the array of feature bits for this device. * vdev: the virtio_device * Returns the first 64 feature bits (all we currently need). @@ -89,6 +91,7 @@ struct virtio_config_ops { const char * const names[], const bool *ctx, struct irq_affinity *desc); void (*del_vqs)(struct virtio_device *); + void (*synchronize_vqs)(struct virtio_device *); u64 (*get_features)(struct virtio_device *vdev); int (*finalize_features)(struct virtio_device *vdev); const char *(*bus_name)(struct virtio_device *vdev); @@ -217,6 +220,19 @@ int virtio_find_vqs_ctx(struct virtio_device *vdev, unsigned nvqs, desc); } +/** + * virtio_synchronize_vqs - synchronize with virtqueue callbacks + * @vdev: the device + */ +static inline +void virtio_synchronize_vqs(struct virtio_device *dev) +{ + if (dev->config->synchronize_vqs) + dev->config->synchronize_vqs(dev); + else + synchronize_rcu(); +} + /** * virtio_device_ready - enable vq use in probe function * @vdev: the device -- 2.25.1 _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
