[qemu.git] / hw / virtio.h

/*
 * 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"
#ifdef CONFIG_LINUX
#include "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
/* 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];
    target_phys_addr_t out_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_notifiers)(void * opaque, bool assigned);
    int (*set_host_notifier)(void * opaque, int n, bool assigned);
    void (*vmstate_change)(void * opaque, bool running);
} 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;
    bool vm_running;
    VMChangeStateEntry *vmstate;
};

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);

void virtqueue_map_sg(struct iovec *sg, target_phys_addr_t *addr,
    size_t num_sg, int is_write);
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);
struct virtio_net_conf;
VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf,
                              struct virtio_net_conf *net);
VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports);
VirtIODevice *virtio_balloon_init(DeviceState *dev);
#ifdef CONFIG_LINUX
VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);
#endif


void virtio_net_exit(VirtIODevice *vdev);
void virtio_blk_exit(VirtIODevice *vdev);
void virtio_serial_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_queue_notify_vq(VirtQueue *vq);
void virtio_irq(VirtQueue *vq);
#endif
Commit	Line	Data
967f97fa AL	1	/*
	2	* Virtio Support
	3	*
	4	* Copyright IBM, Corp. 2007
	5	*
	6	* Authors:
	7	* Anthony Liguori <aliguori@us.ibm.com>
	8	*
	9	* This work is licensed under the terms of the GNU GPL, version 2. See
	10	* the COPYING file in the top-level directory.
	11	*
	12	*/
	13
	14	#ifndef _QEMU_VIRTIO_H
	15	#define _QEMU_VIRTIO_H
	16
967f97fa	17	#include "hw.h"
97b15621	18	#include "net.h"
53c25cea	19	#include "qdev.h"
d176c495	20	#include "sysemu.h"
428c149b	21	#include "block_int.h"
1cbdabe2	22	#include "event_notifier.h"
9f107513 AL	23	#ifdef CONFIG_LINUX
	24	#include "9p.h"
	25	#endif
967f97fa AL	26
	27	/* from Linux's linux/virtio_config.h */
	28
	29	/* Status byte for guest to report progress, and synchronize features. */
	30	/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
	31	#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
	32	/* We have found a driver for the device. */
	33	#define VIRTIO_CONFIG_S_DRIVER 2
	34	/* Driver has used its parts of the config, and is happy */
	35	#define VIRTIO_CONFIG_S_DRIVER_OK 4
	36	/* We've given up on this device. */
	37	#define VIRTIO_CONFIG_S_FAILED 0x80
	38
6d74ca5a MT	39	/* Some virtio feature bits (currently bits 28 through 31) are reserved for the
	40	* transport being used (eg. virtio_ring), the rest are per-device feature bits. */
	41	#define VIRTIO_TRANSPORT_F_START 28
	42	#define VIRTIO_TRANSPORT_F_END 32
	43
d89c682f	44	/* We notify when the ring is completely used, even if the guest is suppressing
967f97fa AL	45	* callbacks */
967f97fa AL	46	#define VIRTIO_F_NOTIFY_ON_EMPTY 24
efeea6d0 MM	47	/* We support indirect buffer descriptors */
efeea6d0 MM	48	#define VIRTIO_RING_F_INDIRECT_DESC 28
8eca6b1b AL	49	/* A guest should never accept this. It implies negotiation is broken. */
8eca6b1b AL	50	#define VIRTIO_F_BAD_FEATURE 30
967f97fa AL	51
	52	/* from Linux's linux/virtio_ring.h */
	53
	54	/* This marks a buffer as continuing via the next field. */
	55	#define VRING_DESC_F_NEXT 1
	56	/* This marks a buffer as write-only (otherwise read-only). */
	57	#define VRING_DESC_F_WRITE 2
efeea6d0 MM	58	/* This means the buffer contains a list of buffer descriptors. */
efeea6d0 MM	59	#define VRING_DESC_F_INDIRECT 4
967f97fa AL	60
	61	/* This means don't notify other side when buffer added. */
	62	#define VRING_USED_F_NO_NOTIFY 1
	63	/* This means don't interrupt guest when buffer consumed. */
	64	#define VRING_AVAIL_F_NO_INTERRUPT 1
	65
	66	struct VirtQueue;
	67
c227f099	68	static inline target_phys_addr_t vring_align(target_phys_addr_t addr,
f46f15bc AL	69	unsigned long align)
	70	{
	71	return (addr + align - 1) & ~(align - 1);
	72	}
	73
967f97fa	74	typedef struct VirtQueue VirtQueue;
967f97fa AL	75
	76	#define VIRTQUEUE_MAX_SIZE 1024
	77
	78	typedef struct VirtQueueElement
	79	{
	80	unsigned int index;
	81	unsigned int out_num;
	82	unsigned int in_num;
c227f099	83	target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
42fb2e07	84	target_phys_addr_t out_addr[VIRTQUEUE_MAX_SIZE];
967f97fa AL	85	struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
	86	struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
	87	} VirtQueueElement;
	88
53c25cea	89	typedef struct {
7055e687	90	void (notify)(void opaque, uint16_t vector);
ff24bd58 MT	91	void (save_config)(void opaque, QEMUFile *f);
	92	void (save_queue)(void opaque, int n, QEMUFile *f);
	93	int (load_config)(void opaque, QEMUFile *f);
	94	int (load_queue)(void opaque, int n, QEMUFile *f);
6d74ca5a	95	unsigned (get_features)(void opaque);
54dd9321	96	int (set_guest_notifiers)(void opaque, bool assigned);
1cbdabe2	97	int (set_host_notifier)(void opaque, int n, bool assigned);
85cf2a8d	98	void (vmstate_change)(void opaque, bool running);
53c25cea PB	99	} VirtIOBindings;
53c25cea PB	100
bb61564c	101	#define VIRTIO_PCI_QUEUE_MAX 64
967f97fa	102
7055e687 MT	103	#define VIRTIO_NO_VECTOR 0xffff
7055e687 MT	104
967f97fa AL	105	struct VirtIODevice
967f97fa AL	106	{
967f97fa	107	const char *name;
967f97fa AL	108	uint8_t status;
	109	uint8_t isr;
	110	uint16_t queue_sel;
704a76fc	111	uint32_t guest_features;
967f97fa AL	112	size_t config_len;
967f97fa AL	113	void *config;
7055e687 MT	114	uint16_t config_vector;
7055e687 MT	115	int nvectors;
8172539d	116	uint32_t (get_features)(VirtIODevice vdev, uint32_t requested_features);
8eca6b1b	117	uint32_t (bad_features)(VirtIODevice vdev);
967f97fa AL	118	void (set_features)(VirtIODevice vdev, uint32_t val);
	119	void (get_config)(VirtIODevice vdev, uint8_t *config);
	120	void (set_config)(VirtIODevice vdev, const uint8_t *config);
	121	void (reset)(VirtIODevice vdev);
3e607cb5	122	void (set_status)(VirtIODevice vdev, uint8_t val);
967f97fa	123	VirtQueue *vq;
53c25cea PB	124	const VirtIOBindings *binding;
	125	void *binding_opaque;
	126	uint16_t device_id;
85cf2a8d MT	127	bool vm_running;
85cf2a8d MT	128	VMChangeStateEntry *vmstate;
967f97fa AL	129	};
967f97fa AL	130
3e607cb5 MT	131	static inline void virtio_set_status(VirtIODevice *vdev, uint8_t val)
	132	{
	133	if (vdev->set_status) {
	134	vdev->set_status(vdev, val);
	135	}
	136	vdev->status = val;
	137	}
	138
967f97fa AL	139	VirtQueue virtio_add_queue(VirtIODevice vdev, int queue_size,
	140	void (handle_output)(VirtIODevice ,
	141	VirtQueue *));
	142
	143	void virtqueue_push(VirtQueue vq, const VirtQueueElement elem,
	144	unsigned int len);
	145	void virtqueue_flush(VirtQueue *vq, unsigned int count);
	146	void virtqueue_fill(VirtQueue vq, const VirtQueueElement elem,
	147	unsigned int len, unsigned int idx);
	148
42fb2e07 KW	149	void virtqueue_map_sg(struct iovec sg, target_phys_addr_t addr,
42fb2e07 KW	150	size_t num_sg, int is_write);
967f97fa AL	151	int virtqueue_pop(VirtQueue vq, VirtQueueElement elem);
	152	int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
	153
	154	void virtio_notify(VirtIODevice vdev, VirtQueue vq);
	155
	156	void virtio_save(VirtIODevice vdev, QEMUFile f);
	157
7055e687	158	int virtio_load(VirtIODevice vdev, QEMUFile f);
967f97fa	159
b946a153 AL	160	void virtio_cleanup(VirtIODevice *vdev);
b946a153 AL	161
967f97fa AL	162	void virtio_notify_config(VirtIODevice *vdev);
	163
	164	void virtio_queue_set_notification(VirtQueue *vq, int enable);
	165
	166	int virtio_queue_ready(VirtQueue *vq);
	167
	168	int virtio_queue_empty(VirtQueue *vq);
	169
53c25cea PB	170	/* Host binding interface. */
	171
	172	VirtIODevice virtio_common_init(const char name, uint16_t device_id,
	173	size_t config_size, size_t struct_size);
	174	uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
	175	uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
	176	uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
	177	void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
	178	void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
	179	void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
c227f099 AL	180	void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr);
c227f099 AL	181	target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n);
53c25cea PB	182	int virtio_queue_get_num(VirtIODevice *vdev, int n);
53c25cea PB	183	void virtio_queue_notify(VirtIODevice *vdev, int n);
7055e687 MT	184	uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
7055e687 MT	185	void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
53c25cea PB	186	void virtio_reset(void *opaque);
	187	void virtio_update_irq(VirtIODevice *vdev);
	188
	189	void virtio_bind_device(VirtIODevice vdev, const VirtIOBindings binding,
	190	void *opaque);
	191
	192	/* Base devices. */
428c149b	193	VirtIODevice virtio_blk_init(DeviceState dev, BlockConf *conf);
f0c07c7c AW	194	struct virtio_net_conf;
	195	VirtIODevice virtio_net_init(DeviceState dev, NICConf *conf,
	196	struct virtio_net_conf *net);
98b19252	197	VirtIODevice virtio_serial_init(DeviceState dev, uint32_t max_nr_ports);
53c25cea	198	VirtIODevice virtio_balloon_init(DeviceState dev);
9f107513 AL	199	#ifdef CONFIG_LINUX
	200	VirtIODevice virtio_9p_init(DeviceState dev, V9fsConf *conf);
	201	#endif
	202
53c25cea	203
97b15621	204	void virtio_net_exit(VirtIODevice *vdev);
9d0d3138	205	void virtio_blk_exit(VirtIODevice *vdev);
8b53a865	206	void virtio_serial_exit(VirtIODevice *vdev);
97b15621	207
8172539d MT	208	#define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
	209	DEFINE_PROP_BIT("indirect_desc", _state, _field, \
	210	VIRTIO_RING_F_INDIRECT_DESC, true)
	211
1cbdabe2 MT	212	target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
	213	target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
	214	target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
	215	target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);
	216	target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
	217	target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
	218	target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n);
	219	target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n);
	220	uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
	221	void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
	222	VirtQueue virtio_get_queue(VirtIODevice vdev, int n);
	223	EventNotifier virtio_queue_get_guest_notifier(VirtQueue vq);
	224	EventNotifier virtio_queue_get_host_notifier(VirtQueue vq);
25db9ebe	225	void virtio_queue_notify_vq(VirtQueue *vq);
1cbdabe2	226	void virtio_irq(VirtQueue *vq);
967f97fa	227	#endif