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 <tglx@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx>
Cc: Marc Zyngier <maz@xxxxxxxxxx>
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
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
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