lsi53c895a: Implement read and write access to DMA Next Address
[qemu-kvm/fedora.git] / hw / virtio.h
blob425727e55972525259ad7d7019b8192eaf3a9698
1 /*
2 * Virtio Support
4 * Copyright IBM, Corp. 2007
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef _QEMU_VIRTIO_H
15 #define _QEMU_VIRTIO_H
17 #include "hw.h"
18 #include "qdev.h"
20 /* from Linux's linux/virtio_config.h */
22 /* Status byte for guest to report progress, and synchronize features. */
23 /* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
24 #define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
25 /* We have found a driver for the device. */
26 #define VIRTIO_CONFIG_S_DRIVER 2
27 /* Driver has used its parts of the config, and is happy */
28 #define VIRTIO_CONFIG_S_DRIVER_OK 4
29 /* We've given up on this device. */
30 #define VIRTIO_CONFIG_S_FAILED 0x80
32 /* We notify when the ring is completely used, even if the guest is supressing
33 * callbacks */
34 #define VIRTIO_F_NOTIFY_ON_EMPTY 24
35 /* A guest should never accept this. It implies negotiation is broken. */
36 #define VIRTIO_F_BAD_FEATURE 30
38 /* from Linux's linux/virtio_ring.h */
40 /* This marks a buffer as continuing via the next field. */
41 #define VRING_DESC_F_NEXT 1
42 /* This marks a buffer as write-only (otherwise read-only). */
43 #define VRING_DESC_F_WRITE 2
45 /* This means don't notify other side when buffer added. */
46 #define VRING_USED_F_NO_NOTIFY 1
47 /* This means don't interrupt guest when buffer consumed. */
48 #define VRING_AVAIL_F_NO_INTERRUPT 1
50 struct VirtQueue;
52 static inline target_phys_addr_t vring_align(target_phys_addr_t addr,
53 unsigned long align)
55 return (addr + align - 1) & ~(align - 1);
58 typedef struct VirtQueue VirtQueue;
59 typedef struct VirtIODevice VirtIODevice;
61 #define VIRTQUEUE_MAX_SIZE 1024
63 typedef struct VirtQueueElement
65 unsigned int index;
66 unsigned int out_num;
67 unsigned int in_num;
68 target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
69 struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
70 struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
71 } VirtQueueElement;
73 typedef struct {
74 void (*update_irq)(void * opaque);
75 } VirtIOBindings;
77 #define VIRTIO_PCI_QUEUE_MAX 16
79 struct VirtIODevice
81 const char *name;
82 uint8_t status;
83 uint8_t isr;
84 uint16_t queue_sel;
85 uint32_t features;
86 size_t config_len;
87 void *config;
88 uint32_t (*get_features)(VirtIODevice *vdev);
89 uint32_t (*bad_features)(VirtIODevice *vdev);
90 void (*set_features)(VirtIODevice *vdev, uint32_t val);
91 void (*get_config)(VirtIODevice *vdev, uint8_t *config);
92 void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
93 void (*reset)(VirtIODevice *vdev);
94 VirtQueue *vq;
95 const VirtIOBindings *binding;
96 void *binding_opaque;
97 uint16_t device_id;
100 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
101 void (*handle_output)(VirtIODevice *,
102 VirtQueue *));
104 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
105 unsigned int len);
106 void virtqueue_flush(VirtQueue *vq, unsigned int count);
107 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
108 unsigned int len, unsigned int idx);
110 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
111 int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
113 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
115 void virtio_save(VirtIODevice *vdev, QEMUFile *f);
117 void virtio_load(VirtIODevice *vdev, QEMUFile *f);
119 void virtio_cleanup(VirtIODevice *vdev);
121 void virtio_notify_config(VirtIODevice *vdev);
123 void virtio_queue_set_notification(VirtQueue *vq, int enable);
125 int virtio_queue_ready(VirtQueue *vq);
127 int virtio_queue_empty(VirtQueue *vq);
129 /* Host binding interface. */
131 VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
132 size_t config_size, size_t struct_size);
133 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
134 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
135 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
136 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
137 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
138 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
139 void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr);
140 target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n);
141 int virtio_queue_get_num(VirtIODevice *vdev, int n);
142 void virtio_queue_notify(VirtIODevice *vdev, int n);
143 void virtio_reset(void *opaque);
144 void virtio_update_irq(VirtIODevice *vdev);
146 void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
147 void *opaque);
149 /* Base devices. */
150 VirtIODevice *virtio_blk_init(DeviceState *dev);
151 VirtIODevice *virtio_net_init(DeviceState *dev);
152 VirtIODevice *virtio_console_init(DeviceState *dev);
153 VirtIODevice *virtio_balloon_init(DeviceState *dev);
155 #endif