1 #ifndef _LINUX_VIRTIO_H
2 #define _LINUX_VIRTIO_H
3 /* Everything a virtio driver needs to work with any particular virtio
5 #include <linux/types.h>
6 #include <linux/scatterlist.h>
7 #include <linux/spinlock.h>
8 #include <linux/device.h>
9 #include <linux/mod_devicetable.h>
10 #include <linux/gfp.h>
13 * virtqueue - a queue to register buffers for sending or receiving.
14 * @list: the chain of virtqueues for this device
15 * @callback: the function to call when buffers are consumed (can be NULL).
16 * @name: the name of this virtqueue (mainly for debugging)
17 * @vdev: the virtio device this queue was created for.
18 * @priv: a pointer for the virtqueue implementation to use.
21 struct list_head list;
22 void (*callback)(struct virtqueue *vq);
24 struct virtio_device *vdev;
28 int virtqueue_add_buf_gfp(struct virtqueue *vq,
29 struct scatterlist sg[],
35 static inline int virtqueue_add_buf(struct virtqueue *vq,
36 struct scatterlist sg[],
41 return virtqueue_add_buf_gfp(vq, sg, out_num, in_num, data, GFP_ATOMIC);
44 void virtqueue_kick(struct virtqueue *vq);
46 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
48 void virtqueue_disable_cb(struct virtqueue *vq);
50 bool virtqueue_enable_cb(struct virtqueue *vq);
52 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
54 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
56 unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
59 * virtio_device - representation of a device using virtio
60 * @index: unique position on the virtio bus
61 * @dev: underlying device.
62 * @id: the device type identification (used to match it with a driver).
63 * @config: the configuration ops for this device.
64 * @vqs: the list of virtqueues for this device.
65 * @features: the features supported by both driver and device.
66 * @priv: private pointer for the driver's use.
68 struct virtio_device {
71 struct virtio_device_id id;
72 struct virtio_config_ops *config;
74 /* Note that this is a Linux set_bit-style bitmap. */
75 unsigned long features[1];
79 #define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev)
80 int register_virtio_device(struct virtio_device *dev);
81 void unregister_virtio_device(struct virtio_device *dev);
84 * virtio_driver - operations for a virtio I/O driver
85 * @driver: underlying device driver (populate name and owner).
86 * @id_table: the ids serviced by this driver.
87 * @feature_table: an array of feature numbers supported by this driver.
88 * @feature_table_size: number of entries in the feature table array.
89 * @probe: the function to call when a device is found. Returns 0 or -errno.
90 * @remove: the function to call when a device is removed.
91 * @config_changed: optional function to call when the device configuration
92 * changes; may be called in interrupt context.
94 struct virtio_driver {
95 struct device_driver driver;
96 const struct virtio_device_id *id_table;
97 const unsigned int *feature_table;
98 unsigned int feature_table_size;
99 int (*probe)(struct virtio_device *dev);
100 void (*remove)(struct virtio_device *dev);
101 void (*config_changed)(struct virtio_device *dev);
104 int register_virtio_driver(struct virtio_driver *drv);
105 void unregister_virtio_driver(struct virtio_driver *drv);
106 #endif /* _LINUX_VIRTIO_H */