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/*

 * Virtio Support

 *

 * Copyright IBM, Corp. 2007

 *

 * Authors:

 *  Anthony Liguori   <aliguori@us.ibm.com>

 *

 * This work is licensed under the terms of the GNU GPL, version 2.  See

 * the COPYING file in the top-level directory.

 *

 */

#ifndef _QEMU_VIRTIO_H

#define _QEMU_VIRTIO_H

#include "hw.h"

#include "net.h"

#include "qdev.h"

#include "sysemu.h"

#include "block_int.h"

#include "event_notifier.h"

/* from Linux's linux/virtio_config.h */

/* Status byte for guest to report progress, and synchronize features. */

/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */

#define VIRTIO_CONFIG_S_ACKNOWLEDGE     1

/* We have found a driver for the device. */

#define VIRTIO_CONFIG_S_DRIVER          2

/* Driver has used its parts of the config, and is happy */

#define VIRTIO_CONFIG_S_DRIVER_OK       4

/* We've given up on this device. */

#define VIRTIO_CONFIG_S_FAILED          0x80

/* Some virtio feature bits (currently bits 28 through 31) are reserved for the

 * transport being used (eg. virtio_ring), the rest are per-device feature bits. */

#define VIRTIO_TRANSPORT_F_START        28

#define VIRTIO_TRANSPORT_F_END          32

/* We notify when the ring is completely used, even if the guest is suppressing

 * callbacks */

#define VIRTIO_F_NOTIFY_ON_EMPTY        24

/* We support indirect buffer descriptors */

#define VIRTIO_RING_F_INDIRECT_DESC     28

/* A guest should never accept this.  It implies negotiation is broken. */

#define VIRTIO_F_BAD_FEATURE                30

/* from Linux's linux/virtio_ring.h */

/* This marks a buffer as continuing via the next field. */

#define VRING_DESC_F_NEXT       1

/* This marks a buffer as write-only (otherwise read-only). */

#define VRING_DESC_F_WRITE      2

/* This means the buffer contains a list of buffer descriptors. */

#define VRING_DESC_F_INDIRECT  4

/* This means don't notify other side when buffer added. */

#define VRING_USED_F_NO_NOTIFY  1

/* This means don't interrupt guest when buffer consumed. */

#define VRING_AVAIL_F_NO_INTERRUPT      1

struct VirtQueue;

static inline target_phys_addr_t vring_align(target_phys_addr_t addr,

                                             unsigned long align)

{

    return (addr + align - 1) & ~(align - 1);

}

typedef struct VirtQueue VirtQueue;

#define VIRTQUEUE_MAX_SIZE 1024

typedef struct VirtQueueElement

{

    unsigned int index;

    unsigned int out_num;

    unsigned int in_num;

    target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];

    struct iovec in_sg[VIRTQUEUE_MAX_SIZE];

    struct iovec out_sg[VIRTQUEUE_MAX_SIZE];

} VirtQueueElement;

typedef struct {

    void (*notify)(void * opaque, uint16_t vector);

    void (*save_config)(void * opaque, QEMUFile *f);

    void (*save_queue)(void * opaque, int n, QEMUFile *f);

    int (*load_config)(void * opaque, QEMUFile *f);

    int (*load_queue)(void * opaque, int n, QEMUFile *f);

    unsigned (*get_features)(void * opaque);

    int (*set_guest_notifier)(void * opaque, int n, bool assigned);

    int (*set_host_notifier)(void * opaque, int n, bool assigned);

} VirtIOBindings;

#define VIRTIO_PCI_QUEUE_MAX 64

#define VIRTIO_NO_VECTOR 0xffff

struct VirtIODevice

{

    const char *name;

    uint8_t status;

    uint8_t isr;

    uint16_t queue_sel;

    uint32_t guest_features;

    size_t config_len;

    void *config;

    uint16_t config_vector;

    int nvectors;

    uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);

    uint32_t (*bad_features)(VirtIODevice *vdev);

    void (*set_features)(VirtIODevice *vdev, uint32_t val);

    void (*get_config)(VirtIODevice *vdev, uint8_t *config);

    void (*set_config)(VirtIODevice *vdev, const uint8_t *config);

    void (*reset)(VirtIODevice *vdev);

    void (*set_status)(VirtIODevice *vdev, uint8_t val);

    VirtQueue *vq;

    const VirtIOBindings *binding;

    void *binding_opaque;

    uint16_t device_id;

};

static inline void virtio_set_status(VirtIODevice *vdev, uint8_t val)

{

    if (vdev->set_status) {

        vdev->set_status(vdev, val);

    }

    vdev->status = val;

}

VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,

                            void (*handle_output)(VirtIODevice *,

                                                  VirtQueue *));

void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,

                    unsigned int len);

void virtqueue_flush(VirtQueue *vq, unsigned int count);

void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,

                    unsigned int len, unsigned int idx);

int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);

int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);

void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);

void virtio_save(VirtIODevice *vdev, QEMUFile *f);

int virtio_load(VirtIODevice *vdev, QEMUFile *f);

void virtio_cleanup(VirtIODevice *vdev);

void virtio_notify_config(VirtIODevice *vdev);

void virtio_queue_set_notification(VirtQueue *vq, int enable);

int virtio_queue_ready(VirtQueue *vq);

int virtio_queue_empty(VirtQueue *vq);

/* Host binding interface.  */

VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,

                                 size_t config_size, size_t struct_size);

uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);

uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);

uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);

void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);

void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);

void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);

void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr);

target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n);

int virtio_queue_get_num(VirtIODevice *vdev, int n);

void virtio_queue_notify(VirtIODevice *vdev, int n);

uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);

void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);

void virtio_reset(void *opaque);

void virtio_update_irq(VirtIODevice *vdev);

void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,

                        void *opaque);

/* Base devices.  */

VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf);

VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf);

VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports);

VirtIODevice *virtio_balloon_init(DeviceState *dev);

void virtio_net_exit(VirtIODevice *vdev);

#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \

        DEFINE_PROP_BIT("indirect_desc", _state, _field, \

                        VIRTIO_RING_F_INDIRECT_DESC, true)

target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);

target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);

target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n);

target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);

target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n);

target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n);

target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n);

target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n);

uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);

void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);

VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);

EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);

EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);

void virtio_irq(VirtQueue *vq);

#endif