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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/hw.h"

#include "net/net.h"

#include "hw/qdev.h"

#include "sysemu/sysemu.h"

#include "qemu/event_notifier.h"

#ifdef CONFIG_VIRTFS

#include "hw/virtio/virtio-9p.h"

#endif

/* 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

/* Can the device handle any descriptor layout? */

#define VIRTIO_F_ANY_LAYOUT             27

/* We support indirect buffer descriptors */

#define VIRTIO_RING_F_INDIRECT_DESC     28

/* The Guest publishes the used index for which it expects an interrupt

 * at the end of the avail ring. Host should ignore the avail->flags field. */

/* The Host publishes the avail index for which it expects a kick

 * at the end of the used ring. Guest should ignore the used->flags field. */

#define VIRTIO_RING_F_EVENT_IDX         29

/* 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 hwaddr vring_align(hwaddr 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;

    hwaddr in_addr[VIRTQUEUE_MAX_SIZE];

    hwaddr out_addr[VIRTQUEUE_MAX_SIZE];

    struct iovec in_sg[VIRTQUEUE_MAX_SIZE];

    struct iovec out_sg[VIRTQUEUE_MAX_SIZE];

} VirtQueueElement;

#define VIRTIO_PCI_QUEUE_MAX 64

#define VIRTIO_NO_VECTOR 0xffff

#define TYPE_VIRTIO_DEVICE "virtio-device"

#define VIRTIO_DEVICE_GET_CLASS(obj) \

        OBJECT_GET_CLASS(VirtioDeviceClass, obj, TYPE_VIRTIO_DEVICE)

#define VIRTIO_DEVICE_CLASS(klass) \

        OBJECT_CLASS_CHECK(VirtioDeviceClass, klass, TYPE_VIRTIO_DEVICE)

#define VIRTIO_DEVICE(obj) \

        OBJECT_CHECK(VirtIODevice, (obj), TYPE_VIRTIO_DEVICE)

struct VirtIODevice

{

    DeviceState parent_obj;

    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;

    VirtQueue *vq;

    uint16_t device_id;

    bool vm_running;

    VMChangeStateEntry *vmstate;

    char *bus_name;

};

typedef struct VirtioDeviceClass {

    /* This is what a VirtioDevice must implement */

    DeviceClass parent;

    int (*init)(VirtIODevice *vdev);

    void (*exit)(VirtIODevice *vdev);

    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);

    /* Test and clear event pending status.

     * Should be called after unmask to avoid losing events.

     * If backend does not support masking,

     * must check in frontend instead.

     */

    bool (*guest_notifier_pending)(VirtIODevice *vdev, int n);

    /* Mask/unmask events from this vq. Any events reported

     * while masked will become pending.

     * If backend does not support masking,

     * must mask in frontend instead.

     */

    void (*guest_notifier_mask)(VirtIODevice *vdev, int n, bool mask);

} VirtioDeviceClass;

void virtio_init(VirtIODevice *vdev, const char *name,

                         uint16_t device_id, size_t config_size);

void virtio_cleanup(VirtIODevice *vdev);

/* Set the child bus name. */

void virtio_device_set_child_bus_name(VirtIODevice *vdev, char *bus_name);

VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,

                            void (*handle_output)(VirtIODevice *,

                                                  VirtQueue *));

void virtio_del_queue(VirtIODevice *vdev, int n);

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);

void virtqueue_map_sg(struct iovec *sg, hwaddr *addr,

    size_t num_sg, int is_write);

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

int virtqueue_avail_bytes(VirtQueue *vq, unsigned int in_bytes,

                          unsigned int out_bytes);

void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int *in_bytes,

                               unsigned int *out_bytes,

                               unsigned max_in_bytes, unsigned max_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_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.  */

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, hwaddr addr);

hwaddr virtio_queue_get_addr(VirtIODevice *vdev, int n);

void virtio_queue_set_num(VirtIODevice *vdev, int n, int num);

int virtio_queue_get_num(VirtIODevice *vdev, int n);

void virtio_queue_set_align(VirtIODevice *vdev, int n, int align);

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_set_status(VirtIODevice *vdev, uint8_t val);

void virtio_reset(void *opaque);

void virtio_update_irq(VirtIODevice *vdev);

int virtio_set_features(VirtIODevice *vdev, uint32_t val);

/* Base devices.  */

typedef struct VirtIOBlkConf VirtIOBlkConf;

struct virtio_net_conf;

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

                              struct virtio_net_conf *net,

                              uint32_t host_features);

typedef struct virtio_serial_conf virtio_serial_conf;

typedef struct VirtIOSCSIConf VirtIOSCSIConf;

typedef struct VirtIORNGConf VirtIORNGConf;

#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \

        DEFINE_PROP_BIT("indirect_desc", _state, _field, \

                        VIRTIO_RING_F_INDIRECT_DESC, true), \

        DEFINE_PROP_BIT("event_idx", _state, _field, \

                        VIRTIO_RING_F_EVENT_IDX, true)

hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);

hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);

hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n);

hwaddr virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);

hwaddr virtio_queue_get_desc_size(VirtIODevice *vdev, int n);

hwaddr virtio_queue_get_avail_size(VirtIODevice *vdev, int n);

hwaddr virtio_queue_get_used_size(VirtIODevice *vdev, int n);

hwaddr 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);

void virtio_queue_invalidate_signalled_used(VirtIODevice *vdev, int n);

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

uint16_t virtio_get_queue_index(VirtQueue *vq);

int virtio_queue_get_id(VirtQueue *vq);

EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);

void virtio_queue_set_guest_notifier_fd_handler(VirtQueue *vq, bool assign,

                                                bool with_irqfd);

EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);

void virtio_queue_set_host_notifier_fd_handler(VirtQueue *vq, bool assign,

                                               bool set_handler);

void virtio_queue_notify_vq(VirtQueue *vq);

void virtio_irq(VirtQueue *vq);

#endif