virtio.h 5.8 KB
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#ifndef _LINUX_VIRTIO_H
#define _LINUX_VIRTIO_H
/* Everything a virtio driver needs to work with any particular virtio
 * implementation. */
#include <linux/types.h>
#include <linux/scatterlist.h>
#include <linux/spinlock.h>
#include <linux/device.h>
#include <linux/mod_devicetable.h>
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#include <linux/gfp.h>
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#include <linux/vringh.h>
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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.
 * @priv: a pointer for the virtqueue implementation to use.
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 * @index: the zero-based ordinal number for this queue.
 * @num_free: number of elements we expect to be able to fit.
 *
 * A note on @num_free: with indirect buffers, each buffer needs one
 * element in the queue, otherwise a buffer will need one element per
 * sg element.
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 */
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struct virtqueue {
	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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	unsigned int index;
	unsigned int num_free;
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	void *priv;
};

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int virtqueue_add_outbuf(struct virtqueue *vq,
			 struct scatterlist sg[], unsigned int num,
			 void *data,
			 gfp_t gfp);

int virtqueue_add_inbuf(struct virtqueue *vq,
			struct scatterlist sg[], unsigned int num,
			void *data,
			gfp_t gfp);

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int virtqueue_add_sgs(struct virtqueue *vq,
		      struct scatterlist *sgs[],
		      unsigned int out_sgs,
		      unsigned int in_sgs,
		      void *data,
		      gfp_t gfp);

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bool virtqueue_kick(struct virtqueue *vq);
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bool virtqueue_kick_prepare(struct virtqueue *vq);

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bool 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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unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);

bool virtqueue_poll(struct virtqueue *vq, unsigned);

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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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bool virtqueue_is_broken(struct virtqueue *vq);

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void *virtqueue_get_avail(struct virtqueue *vq);
void *virtqueue_get_used(struct virtqueue *vq);

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/**
 * virtio_device - representation of a device using virtio
 * @index: unique position on the virtio bus
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 * @failed: saved value for CONFIG_S_FAILED bit (for restore)
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 * @config_enabled: configuration change reporting enabled
 * @config_change_pending: configuration change reported while disabled
 * @config_lock: protects configuration change reporting
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 * @dev: underlying device.
 * @id: the device type identification (used to match it with a driver).
 * @config: the configuration ops for this device.
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 * @vringh_config: configuration ops for host vrings.
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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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struct virtio_device {
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	int index;
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	bool failed;
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	bool config_enabled;
	bool config_change_pending;
	spinlock_t config_lock;
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	struct device dev;
	struct virtio_device_id id;
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	const struct virtio_config_ops *config;
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	const struct vringh_config_ops *vringh_config;
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	struct list_head vqs;
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	u64 features;
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	void *priv;
};

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static inline struct virtio_device *dev_to_virtio(struct device *_dev)
{
	return container_of(_dev, struct virtio_device, dev);
}

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int register_virtio_device(struct virtio_device *dev);
void unregister_virtio_device(struct virtio_device *dev);

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void virtio_break_device(struct virtio_device *dev);

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void virtio_config_changed(struct virtio_device *dev);
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#ifdef CONFIG_PM_SLEEP
int virtio_device_freeze(struct virtio_device *dev);
int virtio_device_restore(struct virtio_device *dev);
#endif
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/**
 * virtio_driver - operations for a virtio I/O driver
 * @driver: underlying device driver (populate name and owner).
 * @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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 * @feature_table_legacy: same as feature_table but when working in legacy mode.
 * @feature_table_size_legacy: number of entries in feature table legacy array.
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 * @legacy_only: driver does not support virtio 1.0.
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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
 *    changes; may be called in interrupt context.
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 */
struct virtio_driver {
	struct device_driver driver;
	const struct virtio_device_id *id_table;
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	const unsigned int *feature_table;
	unsigned int feature_table_size;
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	const unsigned int *feature_table_legacy;
	unsigned int feature_table_size_legacy;
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	bool legacy_only;
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	int (*probe)(struct virtio_device *dev);
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	void (*scan)(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
	int (*freeze)(struct virtio_device *dev);
	int (*restore)(struct virtio_device *dev);
#endif
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};

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static inline struct virtio_driver *drv_to_virtio(struct device_driver *drv)
{
	return container_of(drv, struct virtio_driver, driver);
}

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int register_virtio_driver(struct virtio_driver *drv);
void unregister_virtio_driver(struct virtio_driver *drv);
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/* module_virtio_driver() - Helper macro for drivers that don't do
 * anything special in module init/exit.  This eliminates a lot of
 * boilerplate.  Each module may only use this macro once, and
 * calling it replaces module_init() and module_exit()
 */
#define module_virtio_driver(__virtio_driver) \
	module_driver(__virtio_driver, register_virtio_driver, \
			unregister_virtio_driver)
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#endif /* _LINUX_VIRTIO_H */