qemu-vio-virtio.h

   1 #ifndef QUEMU_VIO_VIRTIO_H
   2 #define QUEMU_VIO_VIRTIO_H
   3
   4 #include <stdint.h>
   5
   6 #include "targphys.h"
   7 #include "block.h"
   8 #include "sysemu.h"
   9 #include "targphys.h"
  10
  11 #include <linux/virtio_blk.h>
  12
  13 #define VIRTQUEUE_MAX_SIZE 1024
  14 #define BLOCK_SERIAL_STRLEN 20
  15
  16 #define VIRTIO_BLK_S_OK         0
  17 #define VIRTIO_BLK_S_IOERR      1
  18 #define VIRTIO_BLK_S_UNSUPP     2
  19
  20 #define VIRTQUEUE_MAX_SIZE 1024
  21 #define VIRTIO_PCI_VRING_ALIGN         4096
  22
  23
  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
  31
  32 /* Some virtio feature bits (currently bits 28 through 31) are reserved for the
  33                  * transport being used (eg. virtio_ring), the rest are per-device feature bits. */
  34 #define VIRTIO_TRANSPORT_F_START        28
  35 #define VIRTIO_TRANSPORT_F_END          32
  36
  37 /* We notify when the ring is completely used, even if the guest is suppressing
  38  * callbacks */
  39 #define VIRTIO_F_NOTIFY_ON_EMPTY        24
  40 /* We support indirect buffer descriptors */
  41 #define VIRTIO_RING_F_INDIRECT_DESC     28
  42 /* A guest should never accept this.  It implies negotiation is broken. */
  43 #define VIRTIO_F_BAD_FEATURE            30
  44
  45 /* from Linux's linux/virtio_ring.h */
  46
  47 /* This marks a buffer as continuing via the next field. */
  48 #define VRING_DESC_F_NEXT       1
  49 /* This marks a buffer as write-only (otherwise read-only). */
  50 #define VRING_DESC_F_WRITE      2
  51 /* This means the buffer contains a list of buffer descriptors. */
  52 #define VRING_DESC_F_INDIRECT  4
  53
  54 /* This means don't notify other side when buffer added. */
  55 #define VRING_USED_F_NO_NOTIFY  1
  56 /* This means don't interrupt guest when buffer consumed. */
  57 #define VRING_AVAIL_F_NO_INTERRUPT      1
  58
  59 #ifndef offsetof
  60 #define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *) 0)->MEMBER)
  61 #endif
  62 #ifndef container_of
  63 #define container_of(ptr, type, member) ({                      \
  64         const typeof(((type *) 0)->member) *__mptr = (ptr);     \
  65         (type *) ((char *) __mptr - offsetof(type, member));})
  66 #endif
  67
  68 #ifndef MIN
  69 #define MIN(a, b) (((a) < (b)) ? (a) : (b))
  70 #endif
  71 #ifndef MAX
  72 #define MAX(a, b) (((a) > (b)) ? (a) : (b))
  73 #endif
  74
  75 /* This is the last element of the write scatter-gather list */
  76 struct virtio_blk_inhdr
  77 {
  78     unsigned char status;
  79 };
  80
  81 /* SCSI pass-through header */
  82 /*
  83 struct virtio_scsi_inhdr
  84 {
  85     uint32_t errors;
  86     uint32_t data_len;
  87     uint32_t sense_len;
  88     uint32_t residual;
  89 };
  90 */
  91
  92 typedef struct {
  93     void (*notify)(void * opaque, uint16_t vector);
  94     void (*save_config)(void * opaque, QEMUFile *f);
  95     void (*save_queue)(void * opaque, int n, QEMUFile *f);
  96     int (*load_config)(void * opaque, QEMUFile *f);
  97     int (*load_queue)(void * opaque, int n, QEMUFile *f);
  98     unsigned (*get_features)(void * opaque);
  99 } VirtIOBindings;
 100
 101 struct myiovec {
 102     void *iov_base;
 103     size_t iov_len;
 104 };
 105
 106 typedef struct VRingDesc
 107 {
 108     uint64_t addr;
 109     uint32_t len;
 110     uint16_t flags;
 111     uint16_t next;
 112         uint32_t poolidx;
 113         uint32_t offset;
 114 } VRingDesc;
 115
 116 typedef struct VRingAvail
 117 {
 118     uint16_t flags;
 119     uint16_t idx;
 120     uint16_t ring[0];
 121 } VRingAvail;
 122
 123 typedef struct VRingUsedElem
 124 {
 125     uint32_t id;
 126     uint32_t len;
 127 } VRingUsedElem;
 128
 129 typedef struct VRingUsed
 130 {
 131     uint16_t flags;
 132     uint16_t idx;
 133     VRingUsedElem ring[0];
 134 } VRingUsed;
 135
 136 typedef struct VRing
 137 {
 138     unsigned int num;
 139     target_phys_addr_t desc;
 140     target_phys_addr_t avail;
 141     target_phys_addr_t used;
 142 } VRing;
 143
 144 typedef struct VirtQueue
 145 {
 146     VRing vring;
 147     target_phys_addr_t pa;
 148     uint16_t last_avail_idx;
 149     int inuse;
 150     uint16_t vector;
 151 //    void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
 152 } VirtQueue;
 153
 154 typedef struct VirtQueueElement
 155 {
 156     unsigned int index;
 157     unsigned int out_num;
 158     unsigned int in_num;
 159     target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
 160     struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
 161     struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
 162 } VirtQueueElement;
 163
 164 struct VirtIODevice
 165 {
 166     const char *name;
 167     uint8_t status;
 168     uint8_t isr;
 169     uint16_t queue_sel;
 170     uint32_t features;
 171     size_t config_len;
 172     void *config;
 173     uint16_t config_vector;
 174     int nvectors;
 175     uint32_t (*get_features)(VirtIODevice *vdev);
 176     uint32_t (*bad_features)(VirtIODevice *vdev);
 177     void (*set_features)(VirtIODevice *vdev, uint32_t val);
 178     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
 179     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
 180     void (*reset)(VirtIODevice *vdev);
 181     VirtQueue *vq;
 182     const VirtIOBindings *binding;
 183     void *binding_opaque;
 184     uint16_t device_id;
 185 };
 186
 187 typedef struct VirtIOBlock
 188 {
 189     VirtIODevice vdev;
 190     BlockDriverState *bs;
 191     VirtQueue *vq;
 192     void *rq;
 193     char serial_str[BLOCK_SERIAL_STRLEN + 1];
 194     QEMUBH *bh;
 195     size_t config_size;
 196 } VirtIOBlock;
 197
 198 typedef struct VirtIOBlockReq
 199 {
 200     VirtIOBlock *dev;
 201     VirtQueueElement elem;
 202     struct virtio_blk_inhdr *in;
 203     struct virtio_blk_outhdr *out;
 204     struct virtio_scsi_inhdr *scsi;
 205     QEMUIOVector qiov;
 206     struct VirtIOBlockReq *next;
 207 } VirtIOBlockReq;
 208
 209 typedef struct MultiReqBuffer {
 210     BlockRequest        blkreq[32];
 211     int                 num_writes;
 212     BlockDriverState    *old_bs;
 213 } MultiReqBuffer;
 214
 215 void *cpu_physical_memory_map(target_phys_addr_t addr,
 216                               target_phys_addr_t *plen,
 217                               int is_write);
 218 void cpu_physical_memory_unmap(void *buffer, target_phys_addr_t len,
 219                                int is_write, target_phys_addr_t access_len);
 220
 221
 222 static inline __u64 ldq_phys(target_phys_addr_t pa) {
 223     __u64 ret;
 224     memcpy(&ret,(void *)pa,8);
 225     return ret;
 226 }
 227
 228 static inline __u32 ldl_phys(target_phys_addr_t pa) {
 229     __u32 ret;
 230     memcpy(&ret,(void *)pa,4);
 231     return ret;
 232 }
 233
 234 static inline __u16 lduw_phys(target_phys_addr_t pa) {
 235     __u16 ret;
 236     memcpy(&ret,(void *)pa,2);
 237     return ret;
 238 }
 239
 240 static inline void stl_phys(target_phys_addr_t pa, uint32_t val) {
 241     memcpy((void *)pa,&val,4);
 242 }
 243
 244 static inline void stw_phys(target_phys_addr_t pa, uint16_t val) {
 245     memcpy((void *)pa,&val,2);
 246 }
 247
 248 void virtqueue_init(VirtQueue *vq);
 249 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,unsigned int len);
 250 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
 251 void virtio_notify(VirtQueue *vq);
 252
 253 #endif