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 } VRingDesc;
 113
 114 typedef struct VRingAvail
 115 {
 116     uint16_t flags;
 117     uint16_t idx;
 118     uint16_t ring[0];
 119 } VRingAvail;
 120
 121 typedef struct VRingUsedElem
 122 {
 123     uint32_t id;
 124     uint32_t len;
 125 } VRingUsedElem;
 126
 127 typedef struct VRingUsed
 128 {
 129     uint16_t flags;
 130     uint16_t idx;
 131     VRingUsedElem ring[0];
 132 } VRingUsed;
 133
 134 typedef struct VRing
 135 {
 136     unsigned int num;
 137     target_phys_addr_t desc;
 138     target_phys_addr_t avail;
 139     target_phys_addr_t used;
 140 } VRing;
 141
 142 typedef struct VirtQueue
 143 {
 144     VRing vring;
 145     target_phys_addr_t pa;
 146     uint16_t last_avail_idx;
 147     int inuse;
 148     uint16_t vector;
 149 //    void (*handle_output)(VirtIODevice *vdev, VirtQueue *vq);
 150 } VirtQueue;
 151
 152 typedef struct VirtQueueElement
 153 {
 154     unsigned int index;
 155     unsigned int out_num;
 156     unsigned int in_num;
 157     target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
 158     struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
 159     struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
 160 } VirtQueueElement;
 161
 162 struct VirtIODevice
 163 {
 164     const char *name;
 165     uint8_t status;
 166     uint8_t isr;
 167     uint16_t queue_sel;
 168     uint32_t features;
 169     size_t config_len;
 170     void *config;
 171     uint16_t config_vector;
 172     int nvectors;
 173     uint32_t (*get_features)(VirtIODevice *vdev);
 174     uint32_t (*bad_features)(VirtIODevice *vdev);
 175     void (*set_features)(VirtIODevice *vdev, uint32_t val);
 176     void (*get_config)(VirtIODevice *vdev, uint8_t *config);
 177     void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
 178     void (*reset)(VirtIODevice *vdev);
 179     VirtQueue *vq;
 180     const VirtIOBindings *binding;
 181     void *binding_opaque;
 182     uint16_t device_id;
 183 };
 184
 185 typedef struct VirtIOBlock
 186 {
 187     VirtIODevice vdev;
 188     BlockDriverState *bs;
 189     VirtQueue *vq;
 190     void *rq;
 191     char serial_str[BLOCK_SERIAL_STRLEN + 1];
 192     QEMUBH *bh;
 193     size_t config_size;
 194 } VirtIOBlock;
 195
 196 typedef struct VirtIOBlockReq
 197 {
 198     VirtIOBlock *dev;
 199     VirtQueueElement elem;
 200     struct virtio_blk_inhdr *in;
 201     struct virtio_blk_outhdr *out;
 202     struct virtio_scsi_inhdr *scsi;
 203     QEMUIOVector qiov;
 204     struct VirtIOBlockReq *next;
 205 } VirtIOBlockReq;
 206
 207 typedef struct MultiReqBuffer {
 208     BlockRequest        blkreq[32];
 209     int                 num_writes;
 210     BlockDriverState    *old_bs;
 211 } MultiReqBuffer;
 212
 213 void *cpu_physical_memory_map(target_phys_addr_t addr,
 214                               target_phys_addr_t *plen,
 215                               int is_write);
 216 void cpu_physical_memory_unmap(void *buffer, target_phys_addr_t len,
 217                                int is_write, target_phys_addr_t access_len);
 218
 219
 220 static inline __u64 ldq_phys(target_phys_addr_t pa) {
 221     __u64 ret;
 222     memcpy(&ret,(void *)pa,8);
 223     return ret;
 224 }
 225
 226 static inline __u32 ldl_phys(target_phys_addr_t pa) {
 227     __u32 ret;
 228     memcpy(&ret,(void *)pa,4);
 229     return ret;
 230 }
 231
 232 static inline __u16 lduw_phys(target_phys_addr_t pa) {
 233     __u16 ret;
 234     memcpy(&ret,(void *)pa,2);
 235     return ret;
 236 }
 237
 238 static inline void stl_phys(target_phys_addr_t pa, uint32_t val) {
 239     memcpy((void *)pa,&val,4);
 240 }
 241
 242 static inline void stw_phys(target_phys_addr_t pa, uint16_t val) {
 243     memcpy((void *)pa,&val,2);
 244 }
 245
 246 void virtqueue_init(VirtQueue *vq);
 247 void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,unsigned int len);
 248 int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
 249 void virtio_notify(VirtQueue *vq);
 250
 251 #endif