107 lines
3.5 KiB
C
107 lines
3.5 KiB
C
#ifndef _LINUX_VIRTIO_H
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#define _LINUX_VIRTIO_H
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/* Everything a virtio driver needs to work with any particular virtio
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* implementation. */
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#include <linux/types.h>
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#include <linux/scatterlist.h>
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#include <linux/spinlock.h>
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/gfp.h>
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/**
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* virtqueue - a queue to register buffers for sending or receiving.
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* @list: the chain of virtqueues for this device
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* @callback: the function to call when buffers are consumed (can be NULL).
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* @name: the name of this virtqueue (mainly for debugging)
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* @vdev: the virtio device this queue was created for.
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* @priv: a pointer for the virtqueue implementation to use.
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*/
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struct virtqueue {
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struct list_head list;
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void (*callback)(struct virtqueue *vq);
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const char *name;
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struct virtio_device *vdev;
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void *priv;
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};
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int virtqueue_add_buf(struct virtqueue *vq,
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struct scatterlist sg[],
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unsigned int out_num,
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unsigned int in_num,
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void *data,
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gfp_t gfp);
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void virtqueue_kick(struct virtqueue *vq);
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bool virtqueue_kick_prepare(struct virtqueue *vq);
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void virtqueue_notify(struct virtqueue *vq);
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void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
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void virtqueue_disable_cb(struct virtqueue *vq);
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bool virtqueue_enable_cb(struct virtqueue *vq);
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bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
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void *virtqueue_detach_unused_buf(struct virtqueue *vq);
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unsigned int virtqueue_get_vring_size(struct virtqueue *vq);
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/**
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* virtio_device - representation of a device using virtio
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* @index: unique position on the virtio bus
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* @dev: underlying device.
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* @id: the device type identification (used to match it with a driver).
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* @config: the configuration ops for this device.
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* @vqs: the list of virtqueues for this device.
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* @features: the features supported by both driver and device.
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* @priv: private pointer for the driver's use.
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*/
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struct virtio_device {
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int index;
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struct device dev;
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struct virtio_device_id id;
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struct virtio_config_ops *config;
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struct list_head vqs;
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/* Note that this is a Linux set_bit-style bitmap. */
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unsigned long features[1];
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void *priv;
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};
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#define dev_to_virtio(dev) container_of(dev, struct virtio_device, dev)
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int register_virtio_device(struct virtio_device *dev);
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void unregister_virtio_device(struct virtio_device *dev);
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/**
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* virtio_driver - operations for a virtio I/O driver
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* @driver: underlying device driver (populate name and owner).
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* @id_table: the ids serviced by this driver.
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* @feature_table: an array of feature numbers supported by this driver.
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* @feature_table_size: number of entries in the feature table array.
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* @probe: the function to call when a device is found. Returns 0 or -errno.
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* @remove: the function to call when a device is removed.
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* @config_changed: optional function to call when the device configuration
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* changes; may be called in interrupt context.
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*/
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struct virtio_driver {
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struct device_driver driver;
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const struct virtio_device_id *id_table;
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const unsigned int *feature_table;
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unsigned int feature_table_size;
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int (*probe)(struct virtio_device *dev);
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void (*remove)(struct virtio_device *dev);
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void (*config_changed)(struct virtio_device *dev);
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#ifdef CONFIG_PM
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int (*freeze)(struct virtio_device *dev);
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int (*thaw)(struct virtio_device *dev);
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int (*restore)(struct virtio_device *dev);
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#endif
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};
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int register_virtio_driver(struct virtio_driver *drv);
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void unregister_virtio_driver(struct virtio_driver *drv);
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#endif /* _LINUX_VIRTIO_H */
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