hw/virtio.h

   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 "hw.h"
  18 #include "net.h"
  19 #include "qdev.h"
  20 #include "sysemu.h"
  21 #include "block_int.h"
  22 #include "event_notifier.h"
  23 #ifdef CONFIG_LINUX
  24 #include "9p.h"
  25 #endif
  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
  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
  44 /* We notify when the ring is completely used, even if the guest is suppressing
  45  * callbacks */
  46 #define VIRTIO_F_NOTIFY_ON_EMPTY        24
  47 /* We support indirect buffer descriptors */
  48 #define VIRTIO_RING_F_INDIRECT_DESC     28
  49 /* A guest should never accept this.  It implies negotiation is broken. */
  50 #define VIRTIO_F_BAD_FEATURE            30
  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
  58 /* This means the buffer contains a list of buffer descriptors. */
  59 #define VRING_DESC_F_INDIRECT  4
  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
  68 static inline target_phys_addr_t vring_align(target_phys_addr_t addr,
  69                                              unsigned long align)
  70 {
  71     return (addr + align - 1) & ~(align - 1);
  72 }
  73
  74 typedef struct VirtQueue VirtQueue;
  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;
  83     target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
  84     struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
  85     struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
  86 } VirtQueueElement;
  87
  88 typedef struct {
  89     void (*notify)(void * opaque, uint16_t vector);
  90     void (*save_config)(void * opaque, QEMUFile *f);
  91     void (*save_queue)(void * opaque, int n, QEMUFile *f);
  92     int (*load_config)(void * opaque, QEMUFile *f);
  93     int (*load_queue)(void * opaque, int n, QEMUFile *f);
  94     unsigned (*get_features)(void * opaque);
  95     int (*set_guest_notifier)(void * opaque, int n, bool assigned);
  96     int (*set_host_notifier)(void * opaque, int n, bool assigned);
  97 } VirtIOBindings;
  98
  99 #define VIRTIO_PCI_QUEUE_MAX 64
 100
 101 #define VIRTIO_NO_VECTOR 0xffff
 102
 103 struct VirtIODevice
 104 {
 105     const char *name;
 106     uint8_t status;
 107     uint8_t isr;
 108     uint16_t queue_sel;
 109     uint32_t guest_features;
 110     size_t config_len;
 111     void *config;
 112     uint16_t config_vector;
 113     int nvectors;
 114     uint32_t (*get_features)(VirtIODevice *vdev, uint32_t requested_features);
 115     uint32_t (*bad_features)(VirtIODevice *vdev);
 116     void (*set_features)(VirtIODevice *vdev, uint32_t val);
 117     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
 118     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
 119     void (*reset)(VirtIODevice *vdev);
 120     void (*set_status)(VirtIODevice *vdev, uint8_t val);
 121     VirtQueue *vq;
 122     const VirtIOBindings *binding;
 123     void *binding_opaque;
 124     uint16_t device_id;
 125 };
 126
 127 static inline void virtio_set_status(VirtIODevice *vdev, uint8_t val)
 128 {
 129     if (vdev->set_status) {
 130         vdev->set_status(vdev, val);
 131     }
 132     vdev->status = val;
 133 }
 134
 135 VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
 136                             void (*handle_output)(VirtIODevice *,
 137                                                   VirtQueue *));
 138
 139 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
 140                     unsigned int len);
 141 void virtqueue_flush(VirtQueue *vq, unsigned int count);
 142 void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
 143                     unsigned int len, unsigned int idx);
 144
 145 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
 146 int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
 147
 148 void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
 149
 150 void virtio_save(VirtIODevice *vdev, QEMUFile *f);
 151
 152 int virtio_load(VirtIODevice *vdev, QEMUFile *f);
 153
 154 void virtio_cleanup(VirtIODevice *vdev);
 155
 156 void virtio_notify_config(VirtIODevice *vdev);
 157
 158 void virtio_queue_set_notification(VirtQueue *vq, int enable);
 159
 160 int virtio_queue_ready(VirtQueue *vq);
 161
 162 int virtio_queue_empty(VirtQueue *vq);
 163
 164 /* Host binding interface.  */
 165
 166 VirtIODevice *virtio_common_init(const char *name, uint16_t device_id,
 167                                  size_t config_size, size_t struct_size);
 168 uint32_t virtio_config_readb(VirtIODevice *vdev, uint32_t addr);
 169 uint32_t virtio_config_readw(VirtIODevice *vdev, uint32_t addr);
 170 uint32_t virtio_config_readl(VirtIODevice *vdev, uint32_t addr);
 171 void virtio_config_writeb(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 172 void virtio_config_writew(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 173 void virtio_config_writel(VirtIODevice *vdev, uint32_t addr, uint32_t data);
 174 void virtio_queue_set_addr(VirtIODevice *vdev, int n, target_phys_addr_t addr);
 175 target_phys_addr_t virtio_queue_get_addr(VirtIODevice *vdev, int n);
 176 int virtio_queue_get_num(VirtIODevice *vdev, int n);
 177 void virtio_queue_notify(VirtIODevice *vdev, int n);
 178 uint16_t virtio_queue_vector(VirtIODevice *vdev, int n);
 179 void virtio_queue_set_vector(VirtIODevice *vdev, int n, uint16_t vector);
 180 void virtio_reset(void *opaque);
 181 void virtio_update_irq(VirtIODevice *vdev);
 182
 183 void virtio_bind_device(VirtIODevice *vdev, const VirtIOBindings *binding,
 184                         void *opaque);
 185
 186 /* Base devices.  */
 187 VirtIODevice *virtio_blk_init(DeviceState *dev, BlockConf *conf);
 188 VirtIODevice *virtio_net_init(DeviceState *dev, NICConf *conf);
 189 VirtIODevice *virtio_serial_init(DeviceState *dev, uint32_t max_nr_ports);
 190 VirtIODevice *virtio_balloon_init(DeviceState *dev);
 191 #ifdef CONFIG_LINUX
 192 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);
 193 #endif
 194
 195
 196 void virtio_net_exit(VirtIODevice *vdev);
 197
 198 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
 199         DEFINE_PROP_BIT("indirect_desc", _state, _field, \
 200                         VIRTIO_RING_F_INDIRECT_DESC, true)
 201
 202 target_phys_addr_t virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
 203 target_phys_addr_t virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
 204 target_phys_addr_t virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
 205 target_phys_addr_t virtio_queue_get_ring_addr(VirtIODevice *vdev, int n);
 206 target_phys_addr_t virtio_queue_get_desc_size(VirtIODevice *vdev, int n);
 207 target_phys_addr_t virtio_queue_get_avail_size(VirtIODevice *vdev, int n);
 208 target_phys_addr_t virtio_queue_get_used_size(VirtIODevice *vdev, int n);
 209 target_phys_addr_t virtio_queue_get_ring_size(VirtIODevice *vdev, int n);
 210 uint16_t virtio_queue_get_last_avail_idx(VirtIODevice *vdev, int n);
 211 void virtio_queue_set_last_avail_idx(VirtIODevice *vdev, int n, uint16_t idx);
 212 VirtQueue *virtio_get_queue(VirtIODevice *vdev, int n);
 213 EventNotifier *virtio_queue_get_guest_notifier(VirtQueue *vq);
 214 EventNotifier *virtio_queue_get_host_notifier(VirtQueue *vq);
 215 void virtio_irq(VirtQueue *vq);
 216 #endif