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/*
* libqos virtio definitions
*
* Copyright (c) 2014 Marc Marí
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef LIBQOS_VIRTIO_H
#define LIBQOS_VIRTIO_H
#include "libqos/malloc.h"
#define QVIRTIO_RESET 0x0
#define QVIRTIO_ACKNOWLEDGE 0x1
#define QVIRTIO_DRIVER 0x2
#define QVIRTIO_DRIVER_OK 0x4
#define QVIRTIO_F_NOTIFY_ON_EMPTY 0x01000000
#define QVIRTIO_F_ANY_LAYOUT 0x08000000
#define QVIRTIO_F_RING_INDIRECT_DESC 0x10000000
#define QVIRTIO_F_RING_EVENT_IDX 0x20000000
#define QVIRTIO_F_BAD_FEATURE 0x40000000
#define QVRING_DESC_F_NEXT 0x1
#define QVRING_DESC_F_WRITE 0x2
#define QVRING_DESC_F_INDIRECT 0x4
#define QVIRTIO_F_NOTIFY_ON_EMPTY 0x01000000
#define QVIRTIO_F_ANY_LAYOUT 0x08000000
#define QVIRTIO_F_RING_INDIRECT_DESC 0x10000000
#define QVIRTIO_F_RING_EVENT_IDX 0x20000000
#define QVIRTIO_F_BAD_FEATURE 0x40000000
#define QVRING_AVAIL_F_NO_INTERRUPT 1
#define QVRING_USED_F_NO_NOTIFY 1
typedef struct QVirtioDevice {
/* Device type */
uint16_t device_type;
} QVirtioDevice;
typedef struct QVRingDesc {
uint64_t addr;
uint32_t len;
uint16_t flags;
uint16_t next;
} QVRingDesc;
typedef struct QVRingAvail {
uint16_t flags;
uint16_t idx;
uint16_t ring[0]; /* This is an array of uint16_t */
uint16_t used_event;
} QVRingAvail;
typedef struct QVRingUsedElem {
uint32_t id;
uint32_t len;
} QVRingUsedElem;
typedef struct QVRingUsed {
uint16_t flags;
uint16_t idx;
QVRingUsedElem ring[0]; /* This is an array of QVRingUsedElem structs */
uint16_t avail_event;
} QVRingUsed;
typedef struct QVirtQueue {
uint64_t desc; /* This points to an array of QVRingDesc */
uint64_t avail; /* This points to a QVRingAvail */
uint64_t used; /* This points to a QVRingDesc */
uint16_t index;
uint32_t size;
uint32_t free_head;
uint32_t num_free;
uint32_t align;
bool indirect;
bool event;
} QVirtQueue;
typedef struct QVRingIndirectDesc {
uint64_t desc; /* This points to an array fo QVRingDesc */
uint16_t index;
uint16_t elem;
} QVRingIndirectDesc;
typedef struct QVirtioBus {
uint8_t (*config_readb)(QVirtioDevice *d, uint64_t addr);
uint16_t (*config_readw)(QVirtioDevice *d, uint64_t addr);
uint32_t (*config_readl)(QVirtioDevice *d, uint64_t addr);
uint64_t (*config_readq)(QVirtioDevice *d, uint64_t addr);
/* Get features of the device */
uint32_t (*get_features)(QVirtioDevice *d);
/* Set features of the device */
void (*set_features)(QVirtioDevice *d, uint32_t features);
/* Get features of the guest */
uint32_t (*get_guest_features)(QVirtioDevice *d);
/* Get status of the device */
uint8_t (*get_status)(QVirtioDevice *d);
/* Set status of the device */
void (*set_status)(QVirtioDevice *d, uint8_t status);
/* Get the queue ISR status of the device */
bool (*get_queue_isr_status)(QVirtioDevice *d, QVirtQueue *vq);
/* Get the configuration ISR status of the device */
bool (*get_config_isr_status)(QVirtioDevice *d);
/* Select a queue to work on */
void (*queue_select)(QVirtioDevice *d, uint16_t index);
/* Get the size of the selected queue */
uint16_t (*get_queue_size)(QVirtioDevice *d);
/* Set the address of the selected queue */
void (*set_queue_address)(QVirtioDevice *d, uint32_t pfn);
/* Setup the virtqueue specified by index */
QVirtQueue *(*virtqueue_setup)(QVirtioDevice *d, QGuestAllocator *alloc,
uint16_t index);
/* Notify changes in virtqueue */
void (*virtqueue_kick)(QVirtioDevice *d, QVirtQueue *vq);
} QVirtioBus;
static inline uint32_t qvring_size(uint32_t num, uint32_t align)
{
return ((sizeof(struct QVRingDesc) * num + sizeof(uint16_t) * (3 + num)
+ align - 1) & ~(align - 1))
+ sizeof(uint16_t) * 3 + sizeof(struct QVRingUsedElem) * num;
}
uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
uint64_t addr);
uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
uint64_t addr);
uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
uint64_t addr);
uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
uint64_t addr);
uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d);
void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d,
uint32_t features);
void qvirtio_reset(const QVirtioBus *bus, QVirtioDevice *d);
void qvirtio_set_acknowledge(const QVirtioBus *bus, QVirtioDevice *d);
void qvirtio_set_driver(const QVirtioBus *bus, QVirtioDevice *d);
void qvirtio_set_driver_ok(const QVirtioBus *bus, QVirtioDevice *d);
void qvirtio_wait_queue_isr(const QVirtioBus *bus, QVirtioDevice *d,
QVirtQueue *vq, gint64 timeout_us);
uint8_t qvirtio_wait_status_byte_no_isr(const QVirtioBus *bus,
QVirtioDevice *d,
QVirtQueue *vq,
uint64_t addr,
gint64 timeout_us);
void qvirtio_wait_config_isr(const QVirtioBus *bus, QVirtioDevice *d,
gint64 timeout_us);
QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
QGuestAllocator *alloc, uint16_t index);
void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr);
QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
QGuestAllocator *alloc, uint16_t elem);
void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data,
uint32_t len, bool write);
uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
bool next);
uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect);
void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
uint32_t free_head);
void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx);
#endif
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