cregit-Linux how code gets into the kernel

Release 4.12 include/linux/virtio.h

Directory: include/linux

/* 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>
#include <linux/gfp.h>
#include <linux/vringh.h>

 * virtqueue - a queue to register buffers for sending or receiving.
 * @list: the chain of virtqueues for this device
 * @callback: the function to call when buffers are consumed (can be NULL).
 * @name: the name of this virtqueue (mainly for debugging)
 * @vdev: the virtio device this queue was created for.
 * @priv: a pointer for the virtqueue implementation to use.
 * @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.

struct virtqueue {
struct list_head list;
void (*callback)(struct virtqueue *vq);
const char *name;
struct virtio_device *vdev;
unsigned int index;
unsigned int num_free;
void *priv;

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);

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

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

bool virtqueue_kick(struct virtqueue *vq);

bool virtqueue_kick_prepare(struct virtqueue *vq);

bool virtqueue_notify(struct virtqueue *vq);

void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);

void *virtqueue_get_buf_ctx(struct virtqueue *vq, unsigned int *len,
			    void **ctx);

void virtqueue_disable_cb(struct virtqueue *vq);

bool virtqueue_enable_cb(struct virtqueue *vq);

unsigned virtqueue_enable_cb_prepare(struct virtqueue *vq);

bool virtqueue_poll(struct virtqueue *vq, unsigned);

bool virtqueue_enable_cb_delayed(struct virtqueue *vq);

void *virtqueue_detach_unused_buf(struct virtqueue *vq);

unsigned int virtqueue_get_vring_size(struct virtqueue *vq);

bool virtqueue_is_broken(struct virtqueue *vq);

const struct vring *virtqueue_get_vring(struct virtqueue *vq);
dma_addr_t virtqueue_get_desc_addr(struct virtqueue *vq);
dma_addr_t virtqueue_get_avail_addr(struct virtqueue *vq);
dma_addr_t virtqueue_get_used_addr(struct virtqueue *vq);

 * Legacy accessors -- in almost all cases, these are the wrong functions
 * to use.

static inline void *virtqueue_get_desc(struct virtqueue *vq) { return virtqueue_get_vring(vq)->desc; }


Andrew Lutomirski21100.00%1100.00%

static inline void *virtqueue_get_avail(struct virtqueue *vq) { return virtqueue_get_vring(vq)->avail; }


Andrew Lutomirski21100.00%1100.00%

static inline void *virtqueue_get_used(struct virtqueue *vq) { return virtqueue_get_vring(vq)->used; }


Andrew Lutomirski21100.00%1100.00%

/** * virtio_device - representation of a device using virtio * @index: unique position on the virtio bus * @failed: saved value for VIRTIO_CONFIG_S_FAILED bit (for restore) * @config_enabled: configuration change reporting enabled * @config_change_pending: configuration change reported while disabled * @config_lock: protects configuration change reporting * @dev: underlying device. * @id: the device type identification (used to match it with a driver). * @config: the configuration ops for this device. * @vringh_config: configuration ops for host vrings. * @vqs: the list of virtqueues for this device. * @features: the features supported by both driver and device. * @priv: private pointer for the driver's use. */ struct virtio_device { int index; bool failed; bool config_enabled; bool config_change_pending; spinlock_t config_lock; struct device dev; struct virtio_device_id id; const struct virtio_config_ops *config; const struct vringh_config_ops *vringh_config; struct list_head vqs; u64 features; void *priv; };
static inline struct virtio_device *dev_to_virtio(struct device *_dev) { return container_of(_dev, struct virtio_device, dev); }


Wanlong Gao2288.00%150.00%
Aneesh Kumar K.V312.00%150.00%

void virtio_add_status(struct virtio_device *dev, unsigned int status); int register_virtio_device(struct virtio_device *dev); void unregister_virtio_device(struct virtio_device *dev); void virtio_break_device(struct virtio_device *dev); void virtio_config_changed(struct virtio_device *dev); void virtio_config_disable(struct virtio_device *dev); void virtio_config_enable(struct virtio_device *dev); int virtio_finalize_features(struct virtio_device *dev); #ifdef CONFIG_PM_SLEEP int virtio_device_freeze(struct virtio_device *dev); int virtio_device_restore(struct virtio_device *dev); #endif /** * 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. * @feature_table: an array of feature numbers supported by this driver. * @feature_table_size: number of entries in the feature table array. * @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. * @probe: the function to call when a device is found. Returns 0 or -errno. * @scan: optional function to call after successful probe; intended * for virtio-scsi to invoke a scan. * @remove: the function to call when a device is removed. * @config_changed: optional function to call when the device configuration * changes; may be called in interrupt context. * @freeze: optional function to call during suspend/hibernation. * @restore: optional function to call on resume. */ struct virtio_driver { struct device_driver driver; const struct virtio_device_id *id_table; const unsigned int *feature_table; unsigned int feature_table_size; const unsigned int *feature_table_legacy; unsigned int feature_table_size_legacy; int (*validate)(struct virtio_device *dev); int (*probe)(struct virtio_device *dev); void (*scan)(struct virtio_device *dev); void (*remove)(struct virtio_device *dev); void (*config_changed)(struct virtio_device *dev); #ifdef CONFIG_PM int (*freeze)(struct virtio_device *dev); int (*restore)(struct virtio_device *dev); #endif };
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); /* 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) #endif /* _LINUX_VIRTIO_H */

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Rusty Russell30238.82%1026.32%
Michael S. Tsirkin20025.71%1231.58%
Andrew Lutomirski8711.18%12.63%
Wanlong Gao476.04%25.26%
John Fastabend405.14%12.63%
Amit Shah293.73%12.63%
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Stephen Hemminger10.13%12.63%
Paul Bolle10.13%12.63%
Directory: include/linux
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