/* SPDX-License-Identifier: GPL-2.0 */
#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>
#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;
}
static inline void *virtqueue_get_avail(struct virtqueue *vq)
{
        return virtqueue_get_vring(vq)->avail;
}
static inline void *virtqueue_get_used(struct virtqueue *vq)
{
        return virtqueue_get_vring(vq)->used;
}

/**
 * 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);
}

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

#define virtio_device_for_each_vq(vdev, vq) \
        list_for_each_entry(vq, &vdev->vqs, list)

/**
 * 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);
}

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 */