virtio: support reserved vqs

[platform/adaptation/renesas_rcar/renesas_kernel.git] / include / linux / virtio_config.h

diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index fc457f4..e2850a7 100644 (file)
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -84,7 +84,9 @@
  *     nvqs: the number of virtqueues to find
  *     vqs: on success, includes new virtqueues
  *     callbacks: array of callbacks, for each virtqueue
  *     nvqs: the number of virtqueues to find
  *     vqs: on success, includes new virtqueues
  *     callbacks: array of callbacks, for each virtqueue

+ *             include a NULL entry for vqs that do not need a callback

  *     names: array of virtqueue names (mainly for debugging)
  *     names: array of virtqueue names (mainly for debugging)

+ *             include a NULL entry for vqs unused by driver

  *     Returns 0 on success or error status
  * @del_vqs: free virtqueues found by find_vqs().
  * @get_features: get the array of feature bits for this device.
  *     Returns 0 on success or error status
  * @del_vqs: free virtqueues found by find_vqs().
  * @get_features: get the array of feature bits for this device.


@@ -98,6 +100,7 @@
  *     vdev: the virtio_device
  *      This returns a pointer to the bus name a la pci_name from which
  *      the caller can then copy.
  *     vdev: the virtio_device
  *      This returns a pointer to the bus name a la pci_name from which
  *      the caller can then copy.

+ * @set_vq_affinity: set the affinity for a virtqueue.

  */
 typedef void vq_callback_t(struct virtqueue *);
 struct virtio_config_ops {
  */
 typedef void vq_callback_t(struct virtqueue *);
 struct virtio_config_ops {


@@ -116,6 +119,7 @@ struct virtio_config_ops {
        u32 (*get_features)(struct virtio_device *vdev);
        void (*finalize_features)(struct virtio_device *vdev);
        const char *(*bus_name)(struct virtio_device *vdev);
        u32 (*get_features)(struct virtio_device *vdev);
        void (*finalize_features)(struct virtio_device *vdev);
        const char *(*bus_name)(struct virtio_device *vdev);

+       int (*set_vq_affinity)(struct virtqueue *vq, int cpu);

 };
 
 /* If driver didn't advertise the feature, it will never appear. */
 };
 
 /* If driver didn't advertise the feature, it will never appear. */


@@ -190,5 +194,24 @@ const char *virtio_bus_name(struct virtio_device *vdev)
        return vdev->config->bus_name(vdev);
 }
 
        return vdev->config->bus_name(vdev);
 }
 

+/**
+ * virtqueue_set_affinity - setting affinity for a virtqueue
+ * @vq: the virtqueue
+ * @cpu: the cpu no.
+ *
+ * Pay attention the function are best-effort: the affinity hint may not be set
+ * due to config support, irq type and sharing.
+ *
+ */
+static inline
+int virtqueue_set_affinity(struct virtqueue *vq, int cpu)
+{
+       struct virtio_device *vdev = vq->vdev;
+       if (vdev->config->set_vq_affinity)
+               return vdev->config->set_vq_affinity(vq, cpu);
+       return 0;
+}
+
+

 #endif /* __KERNEL__ */
 #endif /* _LINUX_VIRTIO_CONFIG_H */
 #endif /* __KERNEL__ */
 #endif /* _LINUX_VIRTIO_CONFIG_H */