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 #include "blockdev.h"
   7
   8 static struct BusInfo scsi_bus_info = {
   9     .name  = "SCSI",
  10     .size  = sizeof(SCSIBus),
  11     .props = (Property[]) {
  12         DEFINE_PROP_UINT32("scsi-id", SCSIDevice, id, -1),
  13         DEFINE_PROP_END_OF_LIST(),
  14     },
  15 };
  16 static int next_scsi_bus;
  17
  18 /* Create a scsi bus, and attach devices to it.  */
  19 void scsi_bus_new(SCSIBus *bus, DeviceState *host, int tcq, int ndev,
  20                   scsi_completionfn complete)
  21 {
  22     qbus_create_inplace(&bus->qbus, &scsi_bus_info, host, NULL);
  23     bus->busnr = next_scsi_bus++;
  24     bus->tcq = tcq;
  25     bus->ndev = ndev;
  26     bus->complete = complete;
  27     bus->qbus.allow_hotplug = 1;
  28 }
  29
  30 static int scsi_qdev_init(DeviceState *qdev, DeviceInfo *base)
  31 {
  32     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  33     SCSIDeviceInfo *info = DO_UPCAST(SCSIDeviceInfo, qdev, base);
  34     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  35     int rc = -1;
  36
  37     if (dev->id == -1) {
  38         for (dev->id = 0; dev->id < bus->ndev; dev->id++) {
  39             if (bus->devs[dev->id] == NULL)
  40                 break;
  41         }
  42     }
  43     if (dev->id >= bus->ndev) {
  44         error_report("bad scsi device id: %d", dev->id);
  45         goto err;
  46     }
  47
  48     if (bus->devs[dev->id]) {
  49         qdev_free(&bus->devs[dev->id]->qdev);
  50     }
  51     bus->devs[dev->id] = dev;
  52
  53     dev->info = info;
  54     QTAILQ_INIT(&dev->requests);
  55     rc = dev->info->init(dev);
  56     if (rc != 0) {
  57         bus->devs[dev->id] = NULL;
  58     }
  59
  60 err:
  61     return rc;
  62 }
  63
  64 static int scsi_qdev_exit(DeviceState *qdev)
  65 {
  66     SCSIDevice *dev = DO_UPCAST(SCSIDevice, qdev, qdev);
  67     SCSIBus *bus = DO_UPCAST(SCSIBus, qbus, dev->qdev.parent_bus);
  68
  69     assert(bus->devs[dev->id] != NULL);
  70     if (bus->devs[dev->id]->info->destroy) {
  71         bus->devs[dev->id]->info->destroy(bus->devs[dev->id]);
  72     }
  73     bus->devs[dev->id] = NULL;
  74     return 0;
  75 }
  76
  77 void scsi_qdev_register(SCSIDeviceInfo *info)
  78 {
  79     info->qdev.bus_info = &scsi_bus_info;
  80     info->qdev.init     = scsi_qdev_init;
  81     info->qdev.unplug   = qdev_simple_unplug_cb;
  82     info->qdev.exit     = scsi_qdev_exit;
  83     qdev_register(&info->qdev);
  84 }
  85
  86 /* handle legacy '-drive if=scsi,...' cmd line args */
  87 SCSIDevice *scsi_bus_legacy_add_drive(SCSIBus *bus, BlockDriverState *bdrv, int unit)
  88 {
  89     const char *driver;
  90     DeviceState *dev;
  91
  92     driver = bdrv_is_sg(bdrv) ? "scsi-generic" : "scsi-disk";
  93     dev = qdev_create(&bus->qbus, driver);
  94     qdev_prop_set_uint32(dev, "scsi-id", unit);
  95     if (qdev_prop_set_drive(dev, "drive", bdrv) < 0) {
  96         qdev_free(dev);
  97         return NULL;
  98     }
  99     if (qdev_init(dev) < 0)
 100         return NULL;
 101     return DO_UPCAST(SCSIDevice, qdev, dev);
 102 }
 103
 104 int scsi_bus_legacy_handle_cmdline(SCSIBus *bus)
 105 {
 106     Location loc;
 107     DriveInfo *dinfo;
 108     int res = 0, unit;
 109
 110     loc_push_none(&loc);
 111     for (unit = 0; unit < MAX_SCSI_DEVS; unit++) {
 112         dinfo = drive_get(IF_SCSI, bus->busnr, unit);
 113         if (dinfo == NULL) {
 114             continue;
 115         }
 116         qemu_opts_loc_restore(dinfo->opts);
 117         if (!scsi_bus_legacy_add_drive(bus, dinfo->bdrv, unit)) {
 118             res = -1;
 119             break;
 120         }
 121     }
 122     loc_pop(&loc);
 123     return res;
 124 }
 125
 126 void scsi_dev_clear_sense(SCSIDevice *dev)
 127 {
 128     memset(&dev->sense, 0, sizeof(dev->sense));
 129 }
 130
 131 void scsi_dev_set_sense(SCSIDevice *dev, uint8_t key)
 132 {
 133     dev->sense.key = key;
 134 }
 135
 136 SCSIRequest *scsi_req_alloc(size_t size, SCSIDevice *d, uint32_t tag, uint32_t lun)
 137 {
 138     SCSIRequest *req;
 139
 140     req = qemu_mallocz(size);
 141     req->bus = scsi_bus_from_device(d);
 142     req->dev = d;
 143     req->tag = tag;
 144     req->lun = lun;
 145     req->status = -1;
 146     req->enqueued = true;
 147     QTAILQ_INSERT_TAIL(&d->requests, req, next);
 148     return req;
 149 }
 150
 151 SCSIRequest *scsi_req_find(SCSIDevice *d, uint32_t tag)
 152 {
 153     SCSIRequest *req;
 154
 155     QTAILQ_FOREACH(req, &d->requests, next) {
 156         if (req->tag == tag) {
 157             return req;
 158         }
 159     }
 160     return NULL;
 161 }
 162
 163 static void scsi_req_dequeue(SCSIRequest *req)
 164 {
 165     if (req->enqueued) {
 166         QTAILQ_REMOVE(&req->dev->requests, req, next);
 167         req->enqueued = false;
 168     }
 169 }
 170
 171 void scsi_req_free(SCSIRequest *req)
 172 {
 173     scsi_req_dequeue(req);
 174     qemu_free(req);
 175 }
 176
 177 static int scsi_req_length(SCSIRequest *req, uint8_t *cmd)
 178 {
 179     switch (cmd[0] >> 5) {
 180     case 0:
 181         req->cmd.xfer = cmd[4];
 182         req->cmd.len = 6;
 183         /* length 0 means 256 blocks */
 184         if (req->cmd.xfer == 0)
 185             req->cmd.xfer = 256;
 186         break;
 187     case 1:
 188     case 2:
 189         req->cmd.xfer = cmd[8] | (cmd[7] << 8);
 190         req->cmd.len = 10;
 191         break;
 192     case 4:
 193         req->cmd.xfer = cmd[13] | (cmd[12] << 8) | (cmd[11] << 16) | (cmd[10] << 24);
 194         req->cmd.len = 16;
 195         break;
 196     case 5:
 197         req->cmd.xfer = cmd[9] | (cmd[8] << 8) | (cmd[7] << 16) | (cmd[6] << 24);
 198         req->cmd.len = 12;
 199         break;
 200     default:
 201         return -1;
 202     }
 203
 204     switch(cmd[0]) {
 205     case TEST_UNIT_READY:
 206     case REZERO_UNIT:
 207     case START_STOP:
 208     case SEEK_6:
 209     case WRITE_FILEMARKS:
 210     case SPACE:
 211     case RESERVE:
 212     case RELEASE:
 213     case ERASE:
 214     case ALLOW_MEDIUM_REMOVAL:
 215     case VERIFY:
 216     case SEEK_10:
 217     case SYNCHRONIZE_CACHE:
 218     case LOCK_UNLOCK_CACHE:
 219     case LOAD_UNLOAD:
 220     case SET_CD_SPEED:
 221     case SET_LIMITS:
 222     case WRITE_LONG:
 223     case MOVE_MEDIUM:
 224     case UPDATE_BLOCK:
 225         req->cmd.xfer = 0;
 226         break;
 227     case MODE_SENSE:
 228         break;
 229     case WRITE_SAME:
 230         req->cmd.xfer = 1;
 231         break;
 232     case READ_CAPACITY:
 233         req->cmd.xfer = 8;
 234         break;
 235     case READ_BLOCK_LIMITS:
 236         req->cmd.xfer = 6;
 237         break;
 238     case READ_POSITION:
 239         req->cmd.xfer = 20;
 240         break;
 241     case SEND_VOLUME_TAG:
 242         req->cmd.xfer *= 40;
 243         break;
 244     case MEDIUM_SCAN:
 245         req->cmd.xfer *= 8;
 246         break;
 247     case WRITE_10:
 248     case WRITE_VERIFY:
 249     case WRITE_6:
 250     case WRITE_12:
 251     case WRITE_VERIFY_12:
 252     case WRITE_16:
 253     case WRITE_VERIFY_16:
 254         req->cmd.xfer *= req->dev->blocksize;
 255         break;
 256     case READ_10:
 257     case READ_6:
 258     case READ_REVERSE:
 259     case RECOVER_BUFFERED_DATA:
 260     case READ_12:
 261     case READ_16:
 262         req->cmd.xfer *= req->dev->blocksize;
 263         break;
 264     case INQUIRY:
 265         req->cmd.xfer = cmd[4] | (cmd[3] << 8);
 266         break;
 267     case MAINTENANCE_OUT:
 268     case MAINTENANCE_IN:
 269         if (req->dev->type == TYPE_ROM) {
 270             /* GPCMD_REPORT_KEY and GPCMD_SEND_KEY from multi media commands */
 271             req->cmd.xfer = cmd[9] | (cmd[8] << 8);
 272         }
 273         break;
 274     }
 275     return 0;
 276 }
 277
 278 static int scsi_req_stream_length(SCSIRequest *req, uint8_t *cmd)
 279 {
 280     switch(cmd[0]) {
 281     /* stream commands */
 282     case READ_6:
 283     case READ_REVERSE:
 284     case RECOVER_BUFFERED_DATA:
 285     case WRITE_6:
 286         req->cmd.len = 6;
 287         req->cmd.xfer = cmd[4] | (cmd[3] << 8) | (cmd[2] << 16);
 288         if (cmd[1] & 0x01) /* fixed */
 289             req->cmd.xfer *= req->dev->blocksize;
 290         break;
 291     case REWIND:
 292     case START_STOP:
 293         req->cmd.len = 6;
 294         req->cmd.xfer = 0;
 295         break;
 296     /* generic commands */
 297     default:
 298         return scsi_req_length(req, cmd);
 299     }
 300     return 0;
 301 }
 302
 303 static void scsi_req_xfer_mode(SCSIRequest *req)
 304 {
 305     switch (req->cmd.buf[0]) {
 306     case WRITE_6:
 307     case WRITE_10:
 308     case WRITE_VERIFY:
 309     case WRITE_12:
 310     case WRITE_VERIFY_12:
 311     case WRITE_16:
 312     case WRITE_VERIFY_16:
 313     case COPY:
 314     case COPY_VERIFY:
 315     case COMPARE:
 316     case CHANGE_DEFINITION:
 317     case LOG_SELECT:
 318     case MODE_SELECT:
 319     case MODE_SELECT_10:
 320     case SEND_DIAGNOSTIC:
 321     case WRITE_BUFFER:
 322     case FORMAT_UNIT:
 323     case REASSIGN_BLOCKS:
 324     case SEARCH_EQUAL:
 325     case SEARCH_HIGH:
 326     case SEARCH_LOW:
 327     case UPDATE_BLOCK:
 328     case WRITE_LONG:
 329     case WRITE_SAME:
 330     case SEARCH_HIGH_12:
 331     case SEARCH_EQUAL_12:
 332     case SEARCH_LOW_12:
 333     case SET_WINDOW:
 334     case MEDIUM_SCAN:
 335     case SEND_VOLUME_TAG:
 336     case WRITE_LONG_2:
 337     case PERSISTENT_RESERVE_OUT:
 338     case MAINTENANCE_OUT:
 339         req->cmd.mode = SCSI_XFER_TO_DEV;
 340         break;
 341     default:
 342         if (req->cmd.xfer)
 343             req->cmd.mode = SCSI_XFER_FROM_DEV;
 344         else {
 345             req->cmd.mode = SCSI_XFER_NONE;
 346         }
 347         break;
 348     }
 349 }
 350
 351 static uint64_t scsi_req_lba(SCSIRequest *req)
 352 {
 353     uint8_t *buf = req->cmd.buf;
 354     uint64_t lba;
 355
 356     switch (buf[0] >> 5) {
 357     case 0:
 358         lba = (uint64_t) buf[3] | ((uint64_t) buf[2] << 8) |
 359               (((uint64_t) buf[1] & 0x1f) << 16);
 360         break;
 361     case 1:
 362     case 2:
 363         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 364               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 365         break;
 366     case 4:
 367         lba = (uint64_t) buf[9] | ((uint64_t) buf[8] << 8) |
 368               ((uint64_t) buf[7] << 16) | ((uint64_t) buf[6] << 24) |
 369               ((uint64_t) buf[5] << 32) | ((uint64_t) buf[4] << 40) |
 370               ((uint64_t) buf[3] << 48) | ((uint64_t) buf[2] << 56);
 371         break;
 372     case 5:
 373         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 374               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 375         break;
 376     default:
 377         lba = -1;
 378
 379     }
 380     return lba;
 381 }
 382
 383 int scsi_req_parse(SCSIRequest *req, uint8_t *buf)
 384 {
 385     int rc;
 386
 387     if (req->dev->type == TYPE_TAPE) {
 388         rc = scsi_req_stream_length(req, buf);
 389     } else {
 390         rc = scsi_req_length(req, buf);
 391     }
 392     if (rc != 0)
 393         return rc;
 394
 395     memcpy(req->cmd.buf, buf, req->cmd.len);
 396     scsi_req_xfer_mode(req);
 397     req->cmd.lba = scsi_req_lba(req);
 398     return 0;
 399 }
 400
 401 static const char *scsi_command_name(uint8_t cmd)
 402 {
 403     static const char *names[] = {
 404         [ TEST_UNIT_READY          ] = "TEST_UNIT_READY",
 405         [ REZERO_UNIT              ] = "REZERO_UNIT",
 406         /* REWIND and REZERO_UNIT use the same operation code */
 407         [ REQUEST_SENSE            ] = "REQUEST_SENSE",
 408         [ FORMAT_UNIT              ] = "FORMAT_UNIT",
 409         [ READ_BLOCK_LIMITS        ] = "READ_BLOCK_LIMITS",
 410         [ REASSIGN_BLOCKS          ] = "REASSIGN_BLOCKS",
 411         [ READ_6                   ] = "READ_6",
 412         [ WRITE_6                  ] = "WRITE_6",
 413         [ SEEK_6                   ] = "SEEK_6",
 414         [ READ_REVERSE             ] = "READ_REVERSE",
 415         [ WRITE_FILEMARKS          ] = "WRITE_FILEMARKS",
 416         [ SPACE                    ] = "SPACE",
 417         [ INQUIRY                  ] = "INQUIRY",
 418         [ RECOVER_BUFFERED_DATA    ] = "RECOVER_BUFFERED_DATA",
 419         [ MAINTENANCE_IN           ] = "MAINTENANCE_IN",
 420         [ MAINTENANCE_OUT          ] = "MAINTENANCE_OUT",
 421         [ MODE_SELECT              ] = "MODE_SELECT",
 422         [ RESERVE                  ] = "RESERVE",
 423         [ RELEASE                  ] = "RELEASE",
 424         [ COPY                     ] = "COPY",
 425         [ ERASE                    ] = "ERASE",
 426         [ MODE_SENSE               ] = "MODE_SENSE",
 427         [ START_STOP               ] = "START_STOP",
 428         [ RECEIVE_DIAGNOSTIC       ] = "RECEIVE_DIAGNOSTIC",
 429         [ SEND_DIAGNOSTIC          ] = "SEND_DIAGNOSTIC",
 430         [ ALLOW_MEDIUM_REMOVAL     ] = "ALLOW_MEDIUM_REMOVAL",
 431
 432         [ SET_WINDOW               ] = "SET_WINDOW",
 433         [ READ_CAPACITY            ] = "READ_CAPACITY",
 434         [ READ_10                  ] = "READ_10",
 435         [ WRITE_10                 ] = "WRITE_10",
 436         [ SEEK_10                  ] = "SEEK_10",
 437         [ WRITE_VERIFY             ] = "WRITE_VERIFY",
 438         [ VERIFY                   ] = "VERIFY",
 439         [ SEARCH_HIGH              ] = "SEARCH_HIGH",
 440         [ SEARCH_EQUAL             ] = "SEARCH_EQUAL",
 441         [ SEARCH_LOW               ] = "SEARCH_LOW",
 442         [ SET_LIMITS               ] = "SET_LIMITS",
 443         [ PRE_FETCH                ] = "PRE_FETCH",
 444         /* READ_POSITION and PRE_FETCH use the same operation code */
 445         [ SYNCHRONIZE_CACHE        ] = "SYNCHRONIZE_CACHE",
 446         [ LOCK_UNLOCK_CACHE        ] = "LOCK_UNLOCK_CACHE",
 447         [ READ_DEFECT_DATA         ] = "READ_DEFECT_DATA",
 448         [ MEDIUM_SCAN              ] = "MEDIUM_SCAN",
 449         [ COMPARE                  ] = "COMPARE",
 450         [ COPY_VERIFY              ] = "COPY_VERIFY",
 451         [ WRITE_BUFFER             ] = "WRITE_BUFFER",
 452         [ READ_BUFFER              ] = "READ_BUFFER",
 453         [ UPDATE_BLOCK             ] = "UPDATE_BLOCK",
 454         [ READ_LONG                ] = "READ_LONG",
 455         [ WRITE_LONG               ] = "WRITE_LONG",
 456         [ CHANGE_DEFINITION        ] = "CHANGE_DEFINITION",
 457         [ WRITE_SAME               ] = "WRITE_SAME",
 458         [ READ_TOC                 ] = "READ_TOC",
 459         [ LOG_SELECT               ] = "LOG_SELECT",
 460         [ LOG_SENSE                ] = "LOG_SENSE",
 461         [ MODE_SELECT_10           ] = "MODE_SELECT_10",
 462         [ RESERVE_10               ] = "RESERVE_10",
 463         [ RELEASE_10               ] = "RELEASE_10",
 464         [ MODE_SENSE_10            ] = "MODE_SENSE_10",
 465         [ PERSISTENT_RESERVE_IN    ] = "PERSISTENT_RESERVE_IN",
 466         [ PERSISTENT_RESERVE_OUT   ] = "PERSISTENT_RESERVE_OUT",
 467         [ MOVE_MEDIUM              ] = "MOVE_MEDIUM",
 468         [ READ_12                  ] = "READ_12",
 469         [ WRITE_12                 ] = "WRITE_12",
 470         [ WRITE_VERIFY_12          ] = "WRITE_VERIFY_12",
 471         [ SEARCH_HIGH_12           ] = "SEARCH_HIGH_12",
 472         [ SEARCH_EQUAL_12          ] = "SEARCH_EQUAL_12",
 473         [ SEARCH_LOW_12            ] = "SEARCH_LOW_12",
 474         [ READ_ELEMENT_STATUS      ] = "READ_ELEMENT_STATUS",
 475         [ SEND_VOLUME_TAG          ] = "SEND_VOLUME_TAG",
 476         [ WRITE_LONG_2             ] = "WRITE_LONG_2",
 477
 478         [ REPORT_DENSITY_SUPPORT   ] = "REPORT_DENSITY_SUPPORT",
 479         [ GET_CONFIGURATION        ] = "GET_CONFIGURATION",
 480         [ READ_16                  ] = "READ_16",
 481         [ WRITE_16                 ] = "WRITE_16",
 482         [ WRITE_VERIFY_16          ] = "WRITE_VERIFY_16",
 483         [ SERVICE_ACTION_IN        ] = "SERVICE_ACTION_IN",
 484         [ REPORT_LUNS              ] = "REPORT_LUNS",
 485         [ LOAD_UNLOAD              ] = "LOAD_UNLOAD",
 486         [ SET_CD_SPEED             ] = "SET_CD_SPEED",
 487         [ BLANK                    ] = "BLANK",
 488     };
 489
 490     if (cmd >= ARRAY_SIZE(names) || names[cmd] == NULL)
 491         return "*UNKNOWN*";
 492     return names[cmd];
 493 }
 494
 495 void scsi_req_print(SCSIRequest *req)
 496 {
 497     FILE *fp = stderr;
 498     int i;
 499
 500     fprintf(fp, "[%s id=%d] %s",
 501             req->dev->qdev.parent_bus->name,
 502             req->dev->id,
 503             scsi_command_name(req->cmd.buf[0]));
 504     for (i = 1; i < req->cmd.len; i++) {
 505         fprintf(fp, " 0x%02x", req->cmd.buf[i]);
 506     }
 507     switch (req->cmd.mode) {
 508     case SCSI_XFER_NONE:
 509         fprintf(fp, " - none\n");
 510         break;
 511     case SCSI_XFER_FROM_DEV:
 512         fprintf(fp, " - from-dev len=%zd\n", req->cmd.xfer);
 513         break;
 514     case SCSI_XFER_TO_DEV:
 515         fprintf(fp, " - to-dev len=%zd\n", req->cmd.xfer);
 516         break;
 517     default:
 518         fprintf(fp, " - Oops\n");
 519         break;
 520     }
 521 }
 522
 523 void scsi_req_complete(SCSIRequest *req)
 524 {
 525     assert(req->status != -1);
 526     scsi_req_dequeue(req);
 527     req->bus->complete(req->bus, SCSI_REASON_DONE,
 528                        req->tag,
 529                        req->status);
 530 }