hw/scsi-bus.c

   1 #include "hw.h"
   2 #include "qemu-error.h"
   3 #include "scsi.h"
   4 #include "scsi-defs.h"
   5 #include "qdev.h"
   6
   7 static struct BusInfo scsi_bus_info = {
   8     .name  = "SCSI",
   9     .size  = sizeof(SCSIBus),
  10     .props = (Property[]) {
  11         DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
  12         DEFINE_PROP_END_OF_LIST(),
  13     },
  14 };
  15 static int next_scsi_bus;
  16
  17 /* Create a scsi bus, and attach devices to it.  */
  18 void scsi_bus_new(SCSIBus *bus, DeviceState *host, int tcq, int ndev,
  19                   scsi_completionfn complete)
  20 {
  21     qbus_create_inplace(&bus->qbus, &scsi_bus_info, host, NULL);
  22     bus->busnr = next_scsi_bus++;
  23     bus->tcq = tcq;
  24     bus->ndev = ndev;
  25     bus->complete = complete;
  26     bus->qbus.allow_hotplug = 1;
  27 }
  28
  29 static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
  30 {
  31     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  32     SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
  33     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  34     int rc = -1;
  35
  36     if (dev->id == -1) {
  37         for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
  38             if (bus->devs[dev->id] == NULL)
  39                 break;
  40         }
  41     }
  42     if (dev->id >= bus->ndev) {
  43         error_report("bad scsi device id: %d", dev->id);
  44         goto err;
  45     }
  46
  47     if (bus->devs[dev->id]) {
  48         qdev_free(&bus->devs[dev->id]->qdev);
  49     }
  50     bus->devs[dev->id] = dev;
  51
  52     dev->info = info;
  53     QTAILQ_INIT(&dev->requests);
  54     rc = dev->info->init(dev);
  55     if (rc != 0) {
  56         bus->devs[dev->id] = NULL;
  57     }
  58
  59 err:
  60     return rc;
  61 }
  62
  63 static int scsi_qdev_exit(DeviceState *qdev)
  64 {
  65     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  66     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  67
  68     assert(bus->devs[dev->id] != NULL);
  69     if (bus->devs[dev->id]->info->destroy) {
  70         bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
  71     }
  72     bus->devs[dev->id] = NULL;
  73     return 0;
  74 }
  75
  76 void scsi_qdev_register(SCSIDeviceInfo *info)
  77 {
  78     info->qdev.bus_info = &scsi_bus_info;
  79     info->qdev.init     = scsi_qdev_init;
  80     info->qdev.unplug   = qdev_simple_unplug_cb;
  81     info->qdev.exit     = scsi_qdev_exit;
  82     qdev_register(&info->qdev);
  83 }
  84
  85 /* handle legacy '-drive if=scsi,...' cmd line args */
  86 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv, int unit)
  87 {
  88     const char *driver;
  89     DeviceState *dev;
  90
  91     driver = bdrv_is_sg(bdrv) ? "scsi-generic" : "scsi-disk";
  92     dev = qdev_create(&bus->qbus, driver);
  93     qdev_prop_set_uint32(dev, "scsi-id", unit);
  94     if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
  95         qdev_free(dev);
  96         return NULL;
  97     }
  98     if (qdev_init(dev) < 0)
  99         return NULL;
 100     return DO_UPCAST(SCSIDevice, qdev, dev);
 101 }
 102
 103 int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
 104 {
 105     DriveInfo *dinfo;
 106     int res = 0, unit;
 107
 108     for (unit = 0; unit < MAX_SCSI_DEVS; unit++) {
 109         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
 110         if (dinfo == NULL) {
 111             continue;
 112         }
 113         if (!scsi_bus_legacy_add_drive(bus, dinfo->bdrv, unit)) {
 114             res = -1;
 115             break;
 116         }
 117     }
 118     return res;
 119 }
 120
 121 void scsi_dev_clear_sense(SCSIDevice *dev)
 122 {
 123     memset(&dev->sense, 0, sizeof(dev->sense));
 124 }
 125
 126 void scsi_dev_set_sense(SCSIDevice *dev, uint8_t key)
 127 {
 128     dev->sense.key = key;
 129 }
 130
 131 SCSIRequest *scsi_req_alloc(size_t size, SCSIDevice *d, uint32_t tag, uint32_t lun)
 132 {
 133     SCSIRequest *req;
 134
 135     req = qemu_mallocz(size);
 136     req->bus = scsi_bus_from_device(d);
 137     req->dev = d;
 138     req->tag = tag;
 139     req->lun = lun;
 140     req->status = -1;
 141     QTAILQ_INSERT_TAIL(&d->requests, req, next);
 142     return req;
 143 }
 144
 145 SCSIRequest *scsi_req_find(SCSIDevice *d, uint32_t tag)
 146 {
 147     SCSIRequest *req;
 148
 149     QTAILQ_FOREACH(req, &d->requests, next) {
 150         if (req->tag == tag) {
 151             return req;
 152         }
 153     }
 154     return NULL;
 155 }
 156
 157 void scsi_req_free(SCSIRequest *req)
 158 {
 159     QTAILQ_REMOVE(&req->dev->requests, req, next);
 160     qemu_free(req);
 161 }
 162
 163 static int scsi_req_length(SCSIRequest *req, uint8_t *cmd)
 164 {
 165     switch (cmd[0] >> 5) {
 166     case 0:
 167         req->cmd.xfer = cmd[4];
 168         req->cmd.len = 6;
 169         /* length 0 means 256 blocks */
 170         if (req->cmd.xfer == 0)
 171             req->cmd.xfer = 256;
 172         break;
 173     case 1:
 174     case 2:
 175         req->cmd.xfer = cmd[8] | (cmd[7] << 8);
 176         req->cmd.len = 10;
 177         break;
 178     case 4:
 179         req->cmd.xfer = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24);
 180         req->cmd.len = 16;
 181         break;
 182     case 5:
 183         req->cmd.xfer = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24);
 184         req->cmd.len = 12;
 185         break;
 186     default:
 187         return -1;
 188     }
 189
 190     switch(cmd[0]) {
 191     case TEST_UNIT_READY:
 192     case REZERO_UNIT:
 193     case START_STOP:
 194     case SEEK_6:
 195     case WRITE_FILEMARKS:
 196     case SPACE:
 197     case ERASE:
 198     case ALLOW_MEDIUM_REMOVAL:
 199     case VERIFY:
 200     case SEEK_10:
 201     case SYNCHRONIZE_CACHE:
 202     case LOCK_UNLOCK_CACHE:
 203     case LOAD_UNLOAD:
 204     case SET_CD_SPEED:
 205     case SET_LIMITS:
 206     case WRITE_LONG:
 207     case MOVE_MEDIUM:
 208     case UPDATE_BLOCK:
 209         req->cmd.xfer = 0;
 210         break;
 211     case MODE_SENSE:
 212         break;
 213     case WRITE_SAME:
 214         req->cmd.xfer = 1;
 215         break;
 216     case READ_CAPACITY:
 217         req->cmd.xfer = 8;
 218         break;
 219     case READ_BLOCK_LIMITS:
 220         req->cmd.xfer = 6;
 221         break;
 222     case READ_POSITION:
 223         req->cmd.xfer = 20;
 224         break;
 225     case SEND_VOLUME_TAG:
 226         req->cmd.xfer *= 40;
 227         break;
 228     case MEDIUM_SCAN:
 229         req->cmd.xfer *= 8;
 230         break;
 231     case WRITE_10:
 232     case WRITE_VERIFY:
 233     case WRITE_6:
 234     case WRITE_12:
 235     case WRITE_VERIFY_12:
 236     case WRITE_16:
 237     case WRITE_VERIFY_16:
 238         req->cmd.xfer *= req->dev->blocksize;
 239         break;
 240     case READ_10:
 241     case READ_6:
 242     case READ_REVERSE:
 243     case RECOVER_BUFFERED_DATA:
 244     case READ_12:
 245     case READ_16:
 246         req->cmd.xfer *= req->dev->blocksize;
 247         break;
 248     case INQUIRY:
 249         req->cmd.xfer = cmd[4] | (cmd[3] << 8);
 250         break;
 251     case MAINTENANCE_OUT:
 252     case MAINTENANCE_IN:
 253         if (req->dev->type == TYPE_ROM) {
 254             /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
 255             req->cmd.xfer = cmd[9] | (cmd[8] << 8);
 256         }
 257         break;
 258     }
 259     return 0;
 260 }
 261
 262 static int scsi_req_stream_length(SCSIRequest *req, uint8_t *cmd)
 263 {
 264     switch(cmd[0]) {
 265     /* stream commands */
 266     case READ_6:
 267     case READ_REVERSE:
 268     case RECOVER_BUFFERED_DATA:
 269     case WRITE_6:
 270         req->cmd.len = 6;
 271         req->cmd.xfer = cmd[4] | (cmd[3] << 8) | (cmd[2] << 16);
 272         if (cmd[1] & 0x01) /* fixed */
 273             req->cmd.xfer *= req->dev->blocksize;
 274         break;
 275     case REWIND:
 276     case START_STOP:
 277         req->cmd.len = 6;
 278         req->cmd.xfer = 0;
 279         break;
 280     /* generic commands */
 281     default:
 282         return scsi_req_length(req, cmd);
 283     }
 284     return 0;
 285 }
 286
 287 static void scsi_req_xfer_mode(SCSIRequest *req)
 288 {
 289     switch (req->cmd.buf[0]) {
 290     case WRITE_6:
 291     case WRITE_10:
 292     case WRITE_VERIFY:
 293     case WRITE_12:
 294     case WRITE_VERIFY_12:
 295     case WRITE_16:
 296     case WRITE_VERIFY_16:
 297     case COPY:
 298     case COPY_VERIFY:
 299     case COMPARE:
 300     case CHANGE_DEFINITION:
 301     case LOG_SELECT:
 302     case MODE_SELECT:
 303     case MODE_SELECT_10:
 304     case SEND_DIAGNOSTIC:
 305     case WRITE_BUFFER:
 306     case FORMAT_UNIT:
 307     case REASSIGN_BLOCKS:
 308     case RESERVE:
 309     case SEARCH_EQUAL:
 310     case SEARCH_HIGH:
 311     case SEARCH_LOW:
 312     case UPDATE_BLOCK:
 313     case WRITE_LONG:
 314     case WRITE_SAME:
 315     case SEARCH_HIGH_12:
 316     case SEARCH_EQUAL_12:
 317     case SEARCH_LOW_12:
 318     case SET_WINDOW:
 319     case MEDIUM_SCAN:
 320     case SEND_VOLUME_TAG:
 321     case WRITE_LONG_2:
 322     case PERSISTENT_RESERVE_OUT:
 323     case MAINTENANCE_OUT:
 324         req->cmd.mode = SCSI_XFER_TO_DEV;
 325         break;
 326     default:
 327         if (req->cmd.xfer)
 328             req->cmd.mode = SCSI_XFER_FROM_DEV;
 329         else {
 330             req->cmd.mode = SCSI_XFER_NONE;
 331         }
 332         break;
 333     }
 334 }
 335
 336 static uint64_t scsi_req_lba(SCSIRequest *req)
 337 {
 338     uint8_t *buf = req->cmd.buf;
 339     uint64_t lba;
 340
 341     switch (buf[0] >> 5) {
 342     case 0:
 343         lba = (uint64_t) buf[3] | ((uint64_t) buf[2] << 8) |
 344               (((uint64_t) buf[1] & 0x1f) << 16);
 345         break;
 346     case 1:
 347     case 2:
 348         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 349               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 350         break;
 351     case 4:
 352         lba = (uint64_t) buf[9] | ((uint64_t) buf[8] << 8) |
 353               ((uint64_t) buf[7] << 16) | ((uint64_t) buf[6] << 24) |
 354               ((uint64_t) buf[5] << 32) | ((uint64_t) buf[4] << 40) |
 355               ((uint64_t) buf[3] << 48) | ((uint64_t) buf[2] << 56);
 356         break;
 357     case 5:
 358         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 359               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 360         break;
 361     default:
 362         lba = -1;
 363
 364     }
 365     return lba;
 366 }
 367
 368 int scsi_req_parse(SCSIRequest *req, uint8_t *buf)
 369 {
 370     int rc;
 371
 372     if (req->dev->type == TYPE_TAPE) {
 373         rc = scsi_req_stream_length(req, buf);
 374     } else {
 375         rc = scsi_req_length(req, buf);
 376     }
 377     if (rc != 0)
 378         return rc;
 379
 380     memcpy(req->cmd.buf, buf, req->cmd.len);
 381     scsi_req_xfer_mode(req);
 382     req->cmd.lba = scsi_req_lba(req);
 383     return 0;
 384 }
 385
 386 static const char *scsi_command_name(uint8_t cmd)
 387 {
 388     static const char *names[] = {
 389         [ TEST_UNIT_READY          ] = "TEST_UNIT_READY",
 390         [ REZERO_UNIT              ] = "REZERO_UNIT",
 391         /* REWIND and REZERO_UNIT use the same operation code */
 392         [ REQUEST_SENSE            ] = "REQUEST_SENSE",
 393         [ FORMAT_UNIT              ] = "FORMAT_UNIT",
 394         [ READ_BLOCK_LIMITS        ] = "READ_BLOCK_LIMITS",
 395         [ REASSIGN_BLOCKS          ] = "REASSIGN_BLOCKS",
 396         [ READ_6                   ] = "READ_6",
 397         [ WRITE_6                  ] = "WRITE_6",
 398         [ SEEK_6                   ] = "SEEK_6",
 399         [ READ_REVERSE             ] = "READ_REVERSE",
 400         [ WRITE_FILEMARKS          ] = "WRITE_FILEMARKS",
 401         [ SPACE                    ] = "SPACE",
 402         [ INQUIRY                  ] = "INQUIRY",
 403         [ RECOVER_BUFFERED_DATA    ] = "RECOVER_BUFFERED_DATA",
 404         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
 405         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
 406         [ MODE_SELECT              ] = "MODE_SELECT",
 407         [ RESERVE                  ] = "RESERVE",
 408         [ RELEASE                  ] = "RELEASE",
 409         [ COPY                     ] = "COPY",
 410         [ ERASE                    ] = "ERASE",
 411         [ MODE_SENSE               ] = "MODE_SENSE",
 412         [ START_STOP               ] = "START_STOP",
 413         [ RECEIVE_DIAGNOSTIC       ] = "RECEIVE_DIAGNOSTIC",
 414         [ SEND_DIAGNOSTIC          ] = "SEND_DIAGNOSTIC",
 415         [ ALLOW_MEDIUM_REMOVAL     ] = "ALLOW_MEDIUM_REMOVAL",
 416
 417         [ SET_WINDOW               ] = "SET_WINDOW",
 418         [ READ_CAPACITY            ] = "READ_CAPACITY",
 419         [ READ_10                  ] = "READ_10",
 420         [ WRITE_10                 ] = "WRITE_10",
 421         [ SEEK_10                  ] = "SEEK_10",
 422         [ WRITE_VERIFY             ] = "WRITE_VERIFY",
 423         [ VERIFY                   ] = "VERIFY",
 424         [ SEARCH_HIGH              ] = "SEARCH_HIGH",
 425         [ SEARCH_EQUAL             ] = "SEARCH_EQUAL",
 426         [ SEARCH_LOW               ] = "SEARCH_LOW",
 427         [ SET_LIMITS               ] = "SET_LIMITS",
 428         [ PRE_FETCH                ] = "PRE_FETCH",
 429         /* READ_POSITION and PRE_FETCH use the same operation code */
 430         [ SYNCHRONIZE_CACHE        ] = "SYNCHRONIZE_CACHE",
 431         [ LOCK_UNLOCK_CACHE        ] = "LOCK_UNLOCK_CACHE",
 432         [ READ_DEFECT_DATA         ] = "READ_DEFECT_DATA",
 433         [ MEDIUM_SCAN              ] = "MEDIUM_SCAN",
 434         [ COMPARE                  ] = "COMPARE",
 435         [ COPY_VERIFY              ] = "COPY_VERIFY",
 436         [ WRITE_BUFFER             ] = "WRITE_BUFFER",
 437         [ READ_BUFFER              ] = "READ_BUFFER",
 438         [ UPDATE_BLOCK             ] = "UPDATE_BLOCK",
 439         [ READ_LONG                ] = "READ_LONG",
 440         [ WRITE_LONG               ] = "WRITE_LONG",
 441         [ CHANGE_DEFINITION        ] = "CHANGE_DEFINITION",
 442         [ WRITE_SAME               ] = "WRITE_SAME",
 443         [ READ_TOC                 ] = "READ_TOC",
 444         [ LOG_SELECT               ] = "LOG_SELECT",
 445         [ LOG_SENSE                ] = "LOG_SENSE",
 446         [ MODE_SELECT_10           ] = "MODE_SELECT_10",
 447         [ RESERVE_10               ] = "RESERVE_10",
 448         [ RELEASE_10               ] = "RELEASE_10",
 449         [ MODE_SENSE_10            ] = "MODE_SENSE_10",
 450         [ PERSISTENT_RESERVE_IN    ] = "PERSISTENT_RESERVE_IN",
 451         [ PERSISTENT_RESERVE_OUT   ] = "PERSISTENT_RESERVE_OUT",
 452         [ MOVE_MEDIUM              ] = "MOVE_MEDIUM",
 453         [ READ_12                  ] = "READ_12",
 454         [ WRITE_12                 ] = "WRITE_12",
 455         [ WRITE_VERIFY_12          ] = "WRITE_VERIFY_12",
 456         [ SEARCH_HIGH_12           ] = "SEARCH_HIGH_12",
 457         [ SEARCH_EQUAL_12          ] = "SEARCH_EQUAL_12",
 458         [ SEARCH_LOW_12            ] = "SEARCH_LOW_12",
 459         [ READ_ELEMENT_STATUS      ] = "READ_ELEMENT_STATUS",
 460         [ SEND_VOLUME_TAG          ] = "SEND_VOLUME_TAG",
 461         [ WRITE_LONG_2             ] = "WRITE_LONG_2",
 462
 463         [ REPORT_DENSITY_SUPPORT   ] = "REPORT_DENSITY_SUPPORT",
 464         [ GET_CONFIGURATION        ] = "GET_CONFIGURATION",
 465         [ READ_16                  ] = "READ_16",
 466         [ WRITE_16                 ] = "WRITE_16",
 467         [ WRITE_VERIFY_16          ] = "WRITE_VERIFY_16",
 468         [ SERVICE_ACTION_IN        ] = "SERVICE_ACTION_IN",
 469         [ REPORT_LUNS              ] = "REPORT_LUNS",
 470         [ LOAD_UNLOAD              ] = "LOAD_UNLOAD",
 471         [ SET_CD_SPEED             ] = "SET_CD_SPEED",
 472         [ BLANK                    ] = "BLANK",
 473     };
 474
 475     if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL)
 476         return "*UNKNOWN*";
 477     return names[cmd];
 478 }
 479
 480 void scsi_req_print(SCSIRequest *req)
 481 {
 482     FILE *fp = stderr;
 483     int i;
 484
 485     fprintf(fp, "[%s id=%d] %s",
 486             req->dev->qdev.parent_bus->name,
 487             req->dev->id,
 488             scsi_command_name(req->cmd.buf[0]));
 489     for (i = 1; i < req->cmd.len; i++) {
 490         fprintf(fp, " 0x%02x", req->cmd.buf[i]);
 491     }
 492     switch (req->cmd.mode) {
 493     case SCSI_XFER_NONE:
 494         fprintf(fp, " - none\n");
 495         break;
 496     case SCSI_XFER_FROM_DEV:
 497         fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer);
 498         break;
 499     case SCSI_XFER_TO_DEV:
 500         fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer);
 501         break;
 502     default:
 503         fprintf(fp, " - Oops\n");
 504         break;
 505     }
 506 }
 507
 508 void scsi_req_complete(SCSIRequest *req)
 509 {
 510     assert(req->status != -1);
 511     req->bus->complete(req->bus, SCSI_REASON_DONE,
 512                        req->tag,
 513                        req->status);
 514 }