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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 | ||
17 | #include <sys/uio.h> | |
18 | #include "hw.h" | |
19 | #include "pci.h" | |
20 | ||
21 | /* from Linux's linux/virtio_config.h */ | |
22 | ||
23 | /* Status byte for guest to report progress, and synchronize features. */ | |
24 | /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */ | |
25 | #define VIRTIO_CONFIG_S_ACKNOWLEDGE 1 | |
26 | /* We have found a driver for the device. */ | |
27 | #define VIRTIO_CONFIG_S_DRIVER 2 | |
28 | /* Driver has used its parts of the config, and is happy */ | |
29 | #define VIRTIO_CONFIG_S_DRIVER_OK 4 | |
30 | /* We've given up on this device. */ | |
31 | #define VIRTIO_CONFIG_S_FAILED 0x80 | |
32 | ||
33 | /* We notify when the ring is completely used, even if the guest is supressing | |
34 | * callbacks */ | |
35 | #define VIRTIO_F_NOTIFY_ON_EMPTY 24 | |
36 | ||
37 | /* from Linux's linux/virtio_ring.h */ | |
38 | ||
39 | /* This marks a buffer as continuing via the next field. */ | |
40 | #define VRING_DESC_F_NEXT 1 | |
41 | /* This marks a buffer as write-only (otherwise read-only). */ | |
42 | #define VRING_DESC_F_WRITE 2 | |
43 | ||
44 | /* This means don't notify other side when buffer added. */ | |
45 | #define VRING_USED_F_NO_NOTIFY 1 | |
46 | /* This means don't interrupt guest when buffer consumed. */ | |
47 | #define VRING_AVAIL_F_NO_INTERRUPT 1 | |
48 | ||
49 | struct VirtQueue; | |
50 | ||
51 | typedef struct VirtQueue VirtQueue; | |
52 | typedef struct VirtIODevice VirtIODevice; | |
53 | ||
54 | #define VIRTQUEUE_MAX_SIZE 1024 | |
55 | ||
56 | typedef struct VirtQueueElement | |
57 | { | |
58 | unsigned int index; | |
59 | unsigned int out_num; | |
60 | unsigned int in_num; | |
61 | target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE]; | |
62 | struct iovec in_sg[VIRTQUEUE_MAX_SIZE]; | |
63 | struct iovec out_sg[VIRTQUEUE_MAX_SIZE]; | |
64 | } VirtQueueElement; | |
65 | ||
66 | #define VIRTIO_PCI_QUEUE_MAX 16 | |
67 | ||
68 | struct VirtIODevice | |
69 | { | |
70 | PCIDevice pci_dev; | |
71 | const char *name; | |
72 | uint32_t addr; | |
73 | uint8_t status; | |
74 | uint8_t isr; | |
75 | uint16_t queue_sel; | |
76 | uint32_t features; | |
77 | size_t config_len; | |
78 | void *config; | |
79 | uint32_t (*get_features)(VirtIODevice *vdev); | |
80 | void (*set_features)(VirtIODevice *vdev, uint32_t val); | |
81 | void (*get_config)(VirtIODevice *vdev, uint8_t *config); | |
82 | void (*set_config)(VirtIODevice *vdev, const uint8_t *config); | |
83 | void (*reset)(VirtIODevice *vdev); | |
84 | VirtQueue *vq; | |
85 | }; | |
86 | ||
87 | VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name, | |
88 | uint16_t vendor, uint16_t device, | |
89 | uint16_t subvendor, uint16_t subdevice, | |
90 | uint8_t class_code, uint8_t subclass_code, | |
91 | uint8_t pif, size_t config_size, | |
92 | size_t struct_size); | |
93 | ||
94 | VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size, | |
95 | void (*handle_output)(VirtIODevice *, | |
96 | VirtQueue *)); | |
97 | ||
98 | void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem, | |
99 | unsigned int len); | |
100 | void virtqueue_flush(VirtQueue *vq, unsigned int count); | |
101 | void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem, | |
102 | unsigned int len, unsigned int idx); | |
103 | ||
104 | int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem); | |
105 | int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes); | |
106 | ||
107 | void virtio_notify(VirtIODevice *vdev, VirtQueue *vq); | |
108 | ||
109 | void virtio_save(VirtIODevice *vdev, QEMUFile *f); | |
110 | ||
111 | void virtio_load(VirtIODevice *vdev, QEMUFile *f); | |
112 | ||
113 | void virtio_notify_config(VirtIODevice *vdev); | |
114 | ||
115 | void virtio_queue_set_notification(VirtQueue *vq, int enable); | |
116 | ||
117 | int virtio_queue_ready(VirtQueue *vq); | |
118 | ||
119 | int virtio_queue_empty(VirtQueue *vq); | |
120 | ||
121 | #endif |