2 * libqos virtio definitions
4 * Copyright (c) 2014 Marc MarĂ
6 * This work is licensed under the terms of the GNU GPL, version 2 or later.
7 * See the COPYING file in the top-level directory.
10 #ifndef LIBQOS_VIRTIO_H
11 #define LIBQOS_VIRTIO_H
13 #include "libqos/malloc.h"
15 #define QVIRTIO_VENDOR_ID 0x1AF4
17 #define QVIRTIO_RESET 0x0
18 #define QVIRTIO_ACKNOWLEDGE 0x1
19 #define QVIRTIO_DRIVER 0x2
20 #define QVIRTIO_DRIVER_OK 0x4
22 #define QVIRTIO_NET_DEVICE_ID 0x1
23 #define QVIRTIO_BLK_DEVICE_ID 0x2
24 #define QVIRTIO_CONSOLE_DEVICE_ID 0x3
25 #define QVIRTIO_RNG_DEVICE_ID 0x4
26 #define QVIRTIO_BALLOON_DEVICE_ID 0x5
27 #define QVIRTIO_RPMSG_DEVICE_ID 0x7
28 #define QVIRTIO_SCSI_DEVICE_ID 0x8
29 #define QVIRTIO_9P_DEVICE_ID 0x9
31 #define QVIRTIO_F_NOTIFY_ON_EMPTY 0x01000000
32 #define QVIRTIO_F_ANY_LAYOUT 0x08000000
33 #define QVIRTIO_F_RING_INDIRECT_DESC 0x10000000
34 #define QVIRTIO_F_RING_EVENT_IDX 0x20000000
35 #define QVIRTIO_F_BAD_FEATURE 0x40000000
37 #define QVRING_DESC_F_NEXT 0x1
38 #define QVRING_DESC_F_WRITE 0x2
39 #define QVRING_DESC_F_INDIRECT 0x4
41 #define QVIRTIO_F_NOTIFY_ON_EMPTY 0x01000000
42 #define QVIRTIO_F_ANY_LAYOUT 0x08000000
43 #define QVIRTIO_F_RING_INDIRECT_DESC 0x10000000
44 #define QVIRTIO_F_RING_EVENT_IDX 0x20000000
45 #define QVIRTIO_F_BAD_FEATURE 0x40000000
47 #define QVRING_AVAIL_F_NO_INTERRUPT 1
49 #define QVRING_USED_F_NO_NOTIFY 1
51 typedef struct QVirtioDevice {
56 typedef struct QVRingDesc {
63 typedef struct QVRingAvail {
66 uint16_t ring[0]; /* This is an array of uint16_t */
70 typedef struct QVRingUsedElem {
75 typedef struct QVRingUsed {
78 QVRingUsedElem ring[0]; /* This is an array of QVRingUsedElem structs */
82 typedef struct QVirtQueue {
83 uint64_t desc; /* This points to an array of QVRingDesc */
84 uint64_t avail; /* This points to a QVRingAvail */
85 uint64_t used; /* This points to a QVRingDesc */
95 typedef struct QVRingIndirectDesc {
96 uint64_t desc; /* This points to an array fo QVRingDesc */
101 typedef struct QVirtioBus {
102 uint8_t (*config_readb)(QVirtioDevice *d, uint64_t addr);
103 uint16_t (*config_readw)(QVirtioDevice *d, uint64_t addr);
104 uint32_t (*config_readl)(QVirtioDevice *d, uint64_t addr);
105 uint64_t (*config_readq)(QVirtioDevice *d, uint64_t addr);
107 /* Get features of the device */
108 uint32_t (*get_features)(QVirtioDevice *d);
110 /* Set features of the device */
111 void (*set_features)(QVirtioDevice *d, uint32_t features);
113 /* Get features of the guest */
114 uint32_t (*get_guest_features)(QVirtioDevice *d);
116 /* Get status of the device */
117 uint8_t (*get_status)(QVirtioDevice *d);
119 /* Set status of the device */
120 void (*set_status)(QVirtioDevice *d, uint8_t status);
122 /* Get the queue ISR status of the device */
123 bool (*get_queue_isr_status)(QVirtioDevice *d, QVirtQueue *vq);
125 /* Get the configuration ISR status of the device */
126 bool (*get_config_isr_status)(QVirtioDevice *d);
128 /* Select a queue to work on */
129 void (*queue_select)(QVirtioDevice *d, uint16_t index);
131 /* Get the size of the selected queue */
132 uint16_t (*get_queue_size)(QVirtioDevice *d);
134 /* Set the address of the selected queue */
135 void (*set_queue_address)(QVirtioDevice *d, uint32_t pfn);
137 /* Setup the virtqueue specified by index */
138 QVirtQueue *(*virtqueue_setup)(QVirtioDevice *d, QGuestAllocator *alloc,
141 /* Notify changes in virtqueue */
142 void (*virtqueue_kick)(QVirtioDevice *d, QVirtQueue *vq);
145 static inline uint32_t qvring_size(uint32_t num, uint32_t align)
147 return ((sizeof(struct QVRingDesc) * num + sizeof(uint16_t) * (3 + num)
148 + align - 1) & ~(align - 1))
149 + sizeof(uint16_t) * 3 + sizeof(struct QVRingUsedElem) * num;
152 uint8_t qvirtio_config_readb(const QVirtioBus *bus, QVirtioDevice *d,
154 uint16_t qvirtio_config_readw(const QVirtioBus *bus, QVirtioDevice *d,
156 uint32_t qvirtio_config_readl(const QVirtioBus *bus, QVirtioDevice *d,
158 uint64_t qvirtio_config_readq(const QVirtioBus *bus, QVirtioDevice *d,
160 uint32_t qvirtio_get_features(const QVirtioBus *bus, QVirtioDevice *d);
161 void qvirtio_set_features(const QVirtioBus *bus, QVirtioDevice *d,
164 void qvirtio_reset(const QVirtioBus *bus, QVirtioDevice *d);
165 void qvirtio_set_acknowledge(const QVirtioBus *bus, QVirtioDevice *d);
166 void qvirtio_set_driver(const QVirtioBus *bus, QVirtioDevice *d);
167 void qvirtio_set_driver_ok(const QVirtioBus *bus, QVirtioDevice *d);
169 void qvirtio_wait_queue_isr(const QVirtioBus *bus, QVirtioDevice *d,
170 QVirtQueue *vq, gint64 timeout_us);
171 uint8_t qvirtio_wait_status_byte_no_isr(const QVirtioBus *bus,
176 void qvirtio_wait_config_isr(const QVirtioBus *bus, QVirtioDevice *d,
178 QVirtQueue *qvirtqueue_setup(const QVirtioBus *bus, QVirtioDevice *d,
179 QGuestAllocator *alloc, uint16_t index);
181 void qvring_init(const QGuestAllocator *alloc, QVirtQueue *vq, uint64_t addr);
182 QVRingIndirectDesc *qvring_indirect_desc_setup(QVirtioDevice *d,
183 QGuestAllocator *alloc, uint16_t elem);
184 void qvring_indirect_desc_add(QVRingIndirectDesc *indirect, uint64_t data,
185 uint32_t len, bool write);
186 uint32_t qvirtqueue_add(QVirtQueue *vq, uint64_t data, uint32_t len, bool write,
188 uint32_t qvirtqueue_add_indirect(QVirtQueue *vq, QVRingIndirectDesc *indirect);
189 void qvirtqueue_kick(const QVirtioBus *bus, QVirtioDevice *d, QVirtQueue *vq,
192 void qvirtqueue_set_used_event(QVirtQueue *vq, uint16_t idx);