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TOMOYO Linux Cross Reference
Linux/include/linux/virtio.h

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  1 #ifndef _LINUX_VIRTIO_H
  2 #define _LINUX_VIRTIO_H
  3 /* Everything a virtio driver needs to work with any particular virtio
  4  * implementation. */
  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>
 11 
 12 /**
 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.
 19  */
 20 struct virtqueue {
 21         struct list_head list;
 22         void (*callback)(struct virtqueue *vq);
 23         const char *name;
 24         struct virtio_device *vdev;
 25         void *priv;
 26 };
 27 
 28 int virtqueue_add_buf(struct virtqueue *vq,
 29                       struct scatterlist sg[],
 30                       unsigned int out_num,
 31                       unsigned int in_num,
 32                       void *data,
 33                       gfp_t gfp);
 34 
 35 void virtqueue_kick(struct virtqueue *vq);
 36 
 37 bool virtqueue_kick_prepare(struct virtqueue *vq);
 38 
 39 void virtqueue_notify(struct virtqueue *vq);
 40 
 41 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
 42 
 43 void virtqueue_disable_cb(struct virtqueue *vq);
 44 
 45 bool virtqueue_enable_cb(struct virtqueue *vq);
 46 
 47 unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);
 48 
 49 bool virtqueue_poll(struct virtqueue *vq, unsigned);
 50 
 51 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
 52 
 53 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
 54 
 55 unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
 56 
 57 /**
 58  * virtio_device - representation of a device using virtio
 59  * @index: unique position on the virtio bus
 60  * @dev: underlying device.
 61  * @id: the device type identification (used to match it with a driver).
 62  * @config: the configuration ops for this device.
 63  * @vqs: the list of virtqueues for this device.
 64  * @features: the features supported by both driver and device.
 65  * @priv: private pointer for the driver's use.
 66  */
 67 struct virtio_device {
 68         int index;
 69         struct device dev;
 70         struct virtio_device_id id;
 71         struct virtio_config_ops *config;
 72         struct list_head vqs;
 73         /* Note that this is a Linux set_bit-style bitmap. */
 74         unsigned long features[1];
 75         void *priv;
 76 };
 77 
 78 static inline struct virtio_device *dev_to_virtio(struct device *_dev)
 79 {
 80         return container_of(_dev, struct virtio_device, dev);
 81 }
 82 
 83 int register_virtio_device(struct virtio_device *dev);
 84 void unregister_virtio_device(struct virtio_device *dev);
 85 
 86 /**
 87  * virtio_driver - operations for a virtio I/O driver
 88  * @driver: underlying device driver (populate name and owner).
 89  * @id_table: the ids serviced by this driver.
 90  * @feature_table: an array of feature numbers supported by this driver.
 91  * @feature_table_size: number of entries in the feature table array.
 92  * @probe: the function to call when a device is found.  Returns 0 or -errno.
 93  * @remove: the function to call when a device is removed.
 94  * @config_changed: optional function to call when the device configuration
 95  *    changes; may be called in interrupt context.
 96  */
 97 struct virtio_driver {
 98         struct device_driver driver;
 99         const struct virtio_device_id *id_table;
100         const unsigned int *feature_table;
101         unsigned int feature_table_size;
102         int (*probe)(struct virtio_device *dev);
103         void (*remove)(struct virtio_device *dev);
104         void (*config_changed)(struct virtio_device *dev);
105 #ifdef CONFIG_PM
106         int (*freeze)(struct virtio_device *dev);
107         int (*restore)(struct virtio_device *dev);
108 #endif
109 };
110 
111 int register_virtio_driver(struct virtio_driver *drv);
112 void unregister_virtio_driver(struct virtio_driver *drv);
113 #endif /* _LINUX_VIRTIO_H */
114 

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