hw/scsi-disk.c

   1 /*
   2  * SCSI Device emulation
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Based on code by Fabrice Bellard
   6  *
   7  * Written by Paul Brook
   8  *
   9  * This code is licenced under the LGPL.
  10  *
  11  * Note that this file only handles the SCSI architecture model and device
  12  * commands.  Emulation of interface/link layer protocols is handled by
  13  * the host adapter emulator.
  14  */
  15
  16 #include <qemu-common.h>
  17 #include <sysemu.h>
  18 //#define DEBUG_SCSI
  19
  20 #ifdef DEBUG_SCSI
  21 #define DPRINTF(fmt, ...) \
  22 do { printf("scsi-disk: " fmt , ## __VA_ARGS__); } while (0)
  23 #else
  24 #define DPRINTF(fmt, ...) do {} while(0)
  25 #endif
  26
  27 #define BADF(fmt, ...) \
  28 do { fprintf(stderr, "scsi-disk: " fmt , ## __VA_ARGS__); } while (0)
  29
  30 #include "qemu-common.h"
  31 #include "block.h"
  32 #include "scsi-disk.h"
  33
  34 #define SENSE_NO_SENSE        0
  35 #define SENSE_NOT_READY       2
  36 #define SENSE_HARDWARE_ERROR  4
  37 #define SENSE_ILLEGAL_REQUEST 5
  38
  39 #define STATUS_GOOD            0
  40 #define STATUS_CHECK_CONDITION 2
  41
  42 #define SCSI_DMA_BUF_SIZE    131072
  43 #define SCSI_MAX_INQUIRY_LEN 256
  44
  45 #define SCSI_REQ_STATUS_RETRY 0x01
  46
  47 typedef struct SCSIDiskState SCSIDiskState;
  48
  49 typedef struct SCSIRequest {
  50     SCSIBus *bus;
  51     SCSIDiskState *dev;
  52     uint32_t tag;
  53     /* ??? We should probably keep track of whether the data transfer is
  54        a read or a write.  Currently we rely on the host getting it right.  */
  55     /* Both sector and sector_count are in terms of qemu 512 byte blocks.  */
  56     uint64_t sector;
  57     uint32_t sector_count;
  58     struct iovec iov;
  59     QEMUIOVector qiov;
  60     BlockDriverAIOCB *aiocb;
  61     struct SCSIRequest *next;
  62     uint32_t status;
  63 } SCSIRequest;
  64
  65 struct SCSIDiskState
  66 {
  67     SCSIDevice qdev;
  68     DriveInfo *dinfo;
  69     SCSIRequest *requests;
  70     /* The qemu block layer uses a fixed 512 byte sector size.
  71        This is the number of 512 byte blocks in a single scsi sector.  */
  72     int cluster_size;
  73     uint64_t max_lba;
  74     int sense;
  75     char drive_serial_str[21];
  76     QEMUBH *bh;
  77 };
  78
  79 /* Global pool of SCSIRequest structures.  */
  80 static SCSIRequest *free_requests = NULL;
  81
  82 static SCSIRequest *scsi_new_request(SCSIDevice *d, uint32_t tag)
  83 {
  84     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, d);
  85     SCSIRequest *r;
  86
  87     if (free_requests) {
  88         r = free_requests;
  89         free_requests = r->next;
  90     } else {
  91         r = qemu_malloc(sizeof(SCSIRequest));
  92         r->iov.iov_base = qemu_memalign(512, SCSI_DMA_BUF_SIZE);
  93     }
  94     r->bus = scsi_bus_from_device(d);
  95     r->dev = s;
  96     r->tag = tag;
  97     r->sector_count = 0;
  98     r->iov.iov_len = 0;
  99     r->aiocb = NULL;
 100     r->status = 0;
 101
 102     r->next = s->requests;
 103     s->requests = r;
 104     return r;
 105 }
 106
 107 static void scsi_remove_request(SCSIRequest *r)
 108 {
 109     SCSIRequest *last;
 110     SCSIDiskState *s = r->dev;
 111
 112     if (s->requests == r) {
 113         s->requests = r->next;
 114     } else {
 115         last = s->requests;
 116         while (last && last->next != r)
 117             last = last->next;
 118         if (last) {
 119             last->next = r->next;
 120         } else {
 121             BADF("Orphaned request\n");
 122         }
 123     }
 124     r->next = free_requests;
 125     free_requests = r;
 126 }
 127
 128 static SCSIRequest *scsi_find_request(SCSIDiskState *s, uint32_t tag)
 129 {
 130     SCSIRequest *r;
 131
 132     r = s->requests;
 133     while (r && r->tag != tag)
 134         r = r->next;
 135
 136     return r;
 137 }
 138
 139 /* Helper function for command completion.  */
 140 static void scsi_command_complete(SCSIRequest *r, int status, int sense)
 141 {
 142     SCSIDiskState *s = r->dev;
 143     uint32_t tag;
 144     DPRINTF("Command complete tag=0x%x status=%d sense=%d\n", r->tag, status, sense);
 145     s->sense = sense;
 146     tag = r->tag;
 147     scsi_remove_request(r);
 148     r->bus->complete(r->bus, SCSI_REASON_DONE, tag, status);
 149 }
 150
 151 /* Cancel a pending data transfer.  */
 152 static void scsi_cancel_io(SCSIDevice *d, uint32_t tag)
 153 {
 154     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, d);
 155     SCSIRequest *r;
 156     DPRINTF("Cancel tag=0x%x\n", tag);
 157     r = scsi_find_request(s, tag);
 158     if (r) {
 159         if (r->aiocb)
 160             bdrv_aio_cancel(r->aiocb);
 161         r->aiocb = NULL;
 162         scsi_remove_request(r);
 163     }
 164 }
 165
 166 static void scsi_read_complete(void * opaque, int ret)
 167 {
 168     SCSIRequest *r = (SCSIRequest *)opaque;
 169
 170     if (ret) {
 171         DPRINTF("IO error\n");
 172         r->bus->complete(r->bus, SCSI_REASON_DATA, r->tag, 0);
 173         scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_NO_SENSE);
 174         return;
 175     }
 176     DPRINTF("Data ready tag=0x%x len=%" PRId64 "\n", r->tag, r->iov.iov_len);
 177
 178     r->bus->complete(r->bus, SCSI_REASON_DATA, r->tag, r->iov.iov_len);
 179 }
 180
 181 /* Read more data from scsi device into buffer.  */
 182 static void scsi_read_data(SCSIDevice *d, uint32_t tag)
 183 {
 184     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, d);
 185     SCSIRequest *r;
 186     uint32_t n;
 187
 188     r = scsi_find_request(s, tag);
 189     if (!r) {
 190         BADF("Bad read tag 0x%x\n", tag);
 191         /* ??? This is the wrong error.  */
 192         scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_HARDWARE_ERROR);
 193         return;
 194     }
 195     if (r->sector_count == (uint32_t)-1) {
 196         DPRINTF("Read buf_len=%" PRId64 "\n", r->iov.iov_len);
 197         r->sector_count = 0;
 198         r->bus->complete(r->bus, SCSI_REASON_DATA, r->tag, r->iov.iov_len);
 199         return;
 200     }
 201     DPRINTF("Read sector_count=%d\n", r->sector_count);
 202     if (r->sector_count == 0) {
 203         scsi_command_complete(r, STATUS_GOOD, SENSE_NO_SENSE);
 204         return;
 205     }
 206
 207     n = r->sector_count;
 208     if (n > SCSI_DMA_BUF_SIZE / 512)
 209         n = SCSI_DMA_BUF_SIZE / 512;
 210
 211     r->iov.iov_len = n * 512;
 212     qemu_iovec_init_external(&r->qiov, &r->iov, 1);
 213     r->aiocb = bdrv_aio_readv(s->dinfo->bdrv, r->sector, &r->qiov, n,
 214                               scsi_read_complete, r);
 215     if (r->aiocb == NULL)
 216         scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_HARDWARE_ERROR);
 217     r->sector += n;
 218     r->sector_count -= n;
 219 }
 220
 221 static int scsi_handle_write_error(SCSIRequest *r, int error)
 222 {
 223     BlockInterfaceErrorAction action = drive_get_onerror(r->dev->dinfo->bdrv);
 224
 225     if (action == BLOCK_ERR_IGNORE)
 226         return 0;
 227
 228     if ((error == ENOSPC && action == BLOCK_ERR_STOP_ENOSPC)
 229             || action == BLOCK_ERR_STOP_ANY) {
 230         r->status |= SCSI_REQ_STATUS_RETRY;
 231         vm_stop(0);
 232     } else {
 233         scsi_command_complete(r, STATUS_CHECK_CONDITION,
 234                 SENSE_HARDWARE_ERROR);
 235     }
 236
 237     return 1;
 238 }
 239
 240 static void scsi_write_complete(void * opaque, int ret)
 241 {
 242     SCSIRequest *r = (SCSIRequest *)opaque;
 243     uint32_t len;
 244     uint32_t n;
 245
 246     r->aiocb = NULL;
 247
 248     if (ret) {
 249         if (scsi_handle_write_error(r, -ret))
 250             return;
 251     }
 252
 253     n = r->iov.iov_len / 512;
 254     r->sector += n;
 255     r->sector_count -= n;
 256     if (r->sector_count == 0) {
 257         scsi_command_complete(r, STATUS_GOOD, SENSE_NO_SENSE);
 258     } else {
 259         len = r->sector_count * 512;
 260         if (len > SCSI_DMA_BUF_SIZE) {
 261             len = SCSI_DMA_BUF_SIZE;
 262         }
 263         r->iov.iov_len = len;
 264         DPRINTF("Write complete tag=0x%x more=%d\n", r->tag, len);
 265         r->bus->complete(r->bus, SCSI_REASON_DATA, r->tag, len);
 266     }
 267 }
 268
 269 static void scsi_write_request(SCSIRequest *r)
 270 {
 271     SCSIDiskState *s = r->dev;
 272     uint32_t n;
 273
 274     n = r->iov.iov_len / 512;
 275     if (n) {
 276         qemu_iovec_init_external(&r->qiov, &r->iov, 1);
 277         r->aiocb = bdrv_aio_writev(s->dinfo->bdrv, r->sector, &r->qiov, n,
 278                                    scsi_write_complete, r);
 279         if (r->aiocb == NULL)
 280             scsi_command_complete(r, STATUS_CHECK_CONDITION,
 281                                   SENSE_HARDWARE_ERROR);
 282     } else {
 283         /* Invoke completion routine to fetch data from host.  */
 284         scsi_write_complete(r, 0);
 285     }
 286 }
 287
 288 /* Write data to a scsi device.  Returns nonzero on failure.
 289    The transfer may complete asynchronously.  */
 290 static int scsi_write_data(SCSIDevice *d, uint32_t tag)
 291 {
 292     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, d);
 293     SCSIRequest *r;
 294
 295     DPRINTF("Write data tag=0x%x\n", tag);
 296     r = scsi_find_request(s, tag);
 297     if (!r) {
 298         BADF("Bad write tag 0x%x\n", tag);
 299         scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_HARDWARE_ERROR);
 300         return 1;
 301     }
 302
 303     if (r->aiocb)
 304         BADF("Data transfer already in progress\n");
 305
 306     scsi_write_request(r);
 307
 308     return 0;
 309 }
 310
 311 static void scsi_dma_restart_bh(void *opaque)
 312 {
 313     SCSIDiskState *s = opaque;
 314     SCSIRequest *r = s->requests;
 315
 316     qemu_bh_delete(s->bh);
 317     s->bh = NULL;
 318
 319     while (r) {
 320         if (r->status & SCSI_REQ_STATUS_RETRY) {
 321             r->status &= ~SCSI_REQ_STATUS_RETRY;
 322             scsi_write_request(r);
 323         }
 324         r = r->next;
 325     }
 326 }
 327
 328 static void scsi_dma_restart_cb(void *opaque, int running, int reason)
 329 {
 330     SCSIDiskState *s = opaque;
 331
 332     if (!running)
 333         return;
 334
 335     if (!s->bh) {
 336         s->bh = qemu_bh_new(scsi_dma_restart_bh, s);
 337         qemu_bh_schedule(s->bh);
 338     }
 339 }
 340
 341 /* Return a pointer to the data buffer.  */
 342 static uint8_t *scsi_get_buf(SCSIDevice *d, uint32_t tag)
 343 {
 344     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, d);
 345     SCSIRequest *r;
 346
 347     r = scsi_find_request(s, tag);
 348     if (!r) {
 349         BADF("Bad buffer tag 0x%x\n", tag);
 350         return NULL;
 351     }
 352     return (uint8_t *)r->iov.iov_base;
 353 }
 354
 355 /* Execute a scsi command.  Returns the length of the data expected by the
 356    command.  This will be Positive for data transfers from the device
 357    (eg. disk reads), negative for transfers to the device (eg. disk writes),
 358    and zero if the command does not transfer any data.  */
 359
 360 static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
 361                                  uint8_t *buf, int lun)
 362 {
 363     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, d);
 364     uint64_t nb_sectors;
 365     uint64_t lba;
 366     uint32_t len;
 367     int cmdlen;
 368     int is_write;
 369     uint8_t command;
 370     uint8_t *outbuf;
 371     SCSIRequest *r;
 372
 373     command = buf[0];
 374     r = scsi_find_request(s, tag);
 375     if (r) {
 376         BADF("Tag 0x%x already in use\n", tag);
 377         scsi_cancel_io(d, tag);
 378     }
 379     /* ??? Tags are not unique for different luns.  We only implement a
 380        single lun, so this should not matter.  */
 381     r = scsi_new_request(d, tag);
 382     outbuf = (uint8_t *)r->iov.iov_base;
 383     is_write = 0;
 384     DPRINTF("Command: lun=%d tag=0x%x data=0x%02x", lun, tag, buf[0]);
 385     switch (command >> 5) {
 386     case 0:
 387         lba = (uint64_t) buf[3] | ((uint64_t) buf[2] << 8) |
 388               (((uint64_t) buf[1] & 0x1f) << 16);
 389         len = buf[4];
 390         cmdlen = 6;
 391         break;
 392     case 1:
 393     case 2:
 394         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 395               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 396         len = buf[8] | (buf[7] << 8);
 397         cmdlen = 10;
 398         break;
 399     case 4:
 400         lba = (uint64_t) buf[9] | ((uint64_t) buf[8] << 8) |
 401               ((uint64_t) buf[7] << 16) | ((uint64_t) buf[6] << 24) |
 402               ((uint64_t) buf[5] << 32) | ((uint64_t) buf[4] << 40) |
 403               ((uint64_t) buf[3] << 48) | ((uint64_t) buf[2] << 56);
 404         len = buf[13] | (buf[12] << 8) | (buf[11] << 16) | (buf[10] << 24);
 405         cmdlen = 16;
 406         break;
 407     case 5:
 408         lba = (uint64_t) buf[5] | ((uint64_t) buf[4] << 8) |
 409               ((uint64_t) buf[3] << 16) | ((uint64_t) buf[2] << 24);
 410         len = buf[9] | (buf[8] << 8) | (buf[7] << 16) | (buf[6] << 24);
 411         cmdlen = 12;
 412         break;
 413     default:
 414         BADF("Unsupported command length, command %x\n", command);
 415         goto fail;
 416     }
 417 #ifdef DEBUG_SCSI
 418     {
 419         int i;
 420         for (i = 1; i < cmdlen; i++) {
 421             printf(" 0x%02x", buf[i]);
 422         }
 423         printf("\n");
 424     }
 425 #endif
 426     if (lun || buf[1] >> 5) {
 427         /* Only LUN 0 supported.  */
 428         DPRINTF("Unimplemented LUN %d\n", lun ? lun : buf[1] >> 5);
 429         if (command != 0x03 && command != 0x12) /* REQUEST SENSE and INQUIRY */
 430             goto fail;
 431     }
 432     switch (command) {
 433     case 0x0:
 434         DPRINTF("Test Unit Ready\n");
 435         if (!bdrv_is_inserted(s->dinfo->bdrv))
 436             goto notready;
 437         break;
 438     case 0x03:
 439         DPRINTF("Request Sense (len %d)\n", len);
 440         if (len < 4)
 441             goto fail;
 442         memset(outbuf, 0, 4);
 443         r->iov.iov_len = 4;
 444         if (s->sense == SENSE_NOT_READY && len >= 18) {
 445             memset(outbuf, 0, 18);
 446             r->iov.iov_len = 18;
 447             outbuf[7] = 10;
 448             /* asc 0x3a, ascq 0: Medium not present */
 449             outbuf[12] = 0x3a;
 450             outbuf[13] = 0;
 451         }
 452         outbuf[0] = 0xf0;
 453         outbuf[1] = 0;
 454         outbuf[2] = s->sense;
 455         break;
 456     case 0x12:
 457         DPRINTF("Inquiry (len %d)\n", len);
 458         if (buf[1] & 0x2) {
 459             /* Command support data - optional, not implemented */
 460             BADF("optional INQUIRY command support request not implemented\n");
 461             goto fail;
 462         }
 463         else if (buf[1] & 0x1) {
 464             /* Vital product data */
 465             uint8_t page_code = buf[2];
 466             if (len < 4) {
 467                 BADF("Error: Inquiry (EVPD[%02X]) buffer size %d is "
 468                      "less than 4\n", page_code, len);
 469                 goto fail;
 470             }
 471
 472             switch (page_code) {
 473                 case 0x00:
 474                     {
 475                         /* Supported page codes, mandatory */
 476                         DPRINTF("Inquiry EVPD[Supported pages] "
 477                                 "buffer size %d\n", len);
 478
 479                         r->iov.iov_len = 0;
 480
 481                         if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
 482                             outbuf[r->iov.iov_len++] = 5;
 483                         } else {
 484                             outbuf[r->iov.iov_len++] = 0;
 485                         }
 486
 487                         outbuf[r->iov.iov_len++] = 0x00; // this page
 488                         outbuf[r->iov.iov_len++] = 0x00;
 489                         outbuf[r->iov.iov_len++] = 3;    // number of pages
 490                         outbuf[r->iov.iov_len++] = 0x00; // list of supported pages (this page)
 491                         outbuf[r->iov.iov_len++] = 0x80; // unit serial number
 492                         outbuf[r->iov.iov_len++] = 0x83; // device identification
 493                     }
 494                     break;
 495                 case 0x80:
 496                     {
 497                         int l;
 498
 499                         /* Device serial number, optional */
 500                         if (len < 4) {
 501                             BADF("Error: EVPD[Serial number] Inquiry buffer "
 502                                  "size %d too small, %d needed\n", len, 4);
 503                             goto fail;
 504                         }
 505
 506                         DPRINTF("Inquiry EVPD[Serial number] buffer size %d\n", len);
 507                         l = MIN(len, strlen(s->drive_serial_str));
 508
 509                         r->iov.iov_len = 0;
 510
 511                         /* Supported page codes */
 512                         if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
 513                             outbuf[r->iov.iov_len++] = 5;
 514                         } else {
 515                             outbuf[r->iov.iov_len++] = 0;
 516                         }
 517
 518                         outbuf[r->iov.iov_len++] = 0x80; // this page
 519                         outbuf[r->iov.iov_len++] = 0x00;
 520                         outbuf[r->iov.iov_len++] = l;
 521                         memcpy(&outbuf[r->iov.iov_len], s->drive_serial_str, l);
 522                         r->iov.iov_len += l;
 523                     }
 524
 525                     break;
 526                 case 0x83:
 527                     {
 528                         /* Device identification page, mandatory */
 529                         int max_len = 255 - 8;
 530                         int id_len = strlen(bdrv_get_device_name(s->dinfo->bdrv));
 531                         if (id_len > max_len)
 532                             id_len = max_len;
 533
 534                         DPRINTF("Inquiry EVPD[Device identification] "
 535                                 "buffer size %d\n", len);
 536                         r->iov.iov_len = 0;
 537                         if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
 538                             outbuf[r->iov.iov_len++] = 5;
 539                         } else {
 540                             outbuf[r->iov.iov_len++] = 0;
 541                         }
 542
 543                         outbuf[r->iov.iov_len++] = 0x83; // this page
 544                         outbuf[r->iov.iov_len++] = 0x00;
 545                         outbuf[r->iov.iov_len++] = 3 + id_len;
 546
 547                         outbuf[r->iov.iov_len++] = 0x2; // ASCII
 548                         outbuf[r->iov.iov_len++] = 0;   // not officially assigned
 549                         outbuf[r->iov.iov_len++] = 0;   // reserved
 550                         outbuf[r->iov.iov_len++] = id_len; // length of data following
 551
 552                         memcpy(&outbuf[r->iov.iov_len],
 553                                bdrv_get_device_name(s->dinfo->bdrv), id_len);
 554                         r->iov.iov_len += id_len;
 555                     }
 556                     break;
 557                 default:
 558                     BADF("Error: unsupported Inquiry (EVPD[%02X]) "
 559                          "buffer size %d\n", page_code, len);
 560                     goto fail;
 561             }
 562             /* done with EVPD */
 563             break;
 564         }
 565         else {
 566             /* Standard INQUIRY data */
 567             if (buf[2] != 0) {
 568                 BADF("Error: Inquiry (STANDARD) page or code "
 569                      "is non-zero [%02X]\n", buf[2]);
 570                 goto fail;
 571             }
 572
 573             /* PAGE CODE == 0 */
 574             if (len < 5) {
 575                 BADF("Error: Inquiry (STANDARD) buffer size %d "
 576                      "is less than 5\n", len);
 577                 goto fail;
 578             }
 579
 580             if (len < 36) {
 581                 BADF("Error: Inquiry (STANDARD) buffer size %d "
 582                      "is less than 36 (TODO: only 5 required)\n", len);
 583             }
 584         }
 585
 586         if(len > SCSI_MAX_INQUIRY_LEN)
 587             len = SCSI_MAX_INQUIRY_LEN;
 588
 589         memset(outbuf, 0, len);
 590
 591         if (lun || buf[1] >> 5) {
 592             outbuf[0] = 0x7f;   /* LUN not supported */
 593         } else if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
 594             outbuf[0] = 5;
 595             outbuf[1] = 0x80;
 596             memcpy(&outbuf[16], "QEMU CD-ROM    ", 16);
 597         } else {
 598             outbuf[0] = 0;
 599             memcpy(&outbuf[16], "QEMU HARDDISK  ", 16);
 600         }
 601         memcpy(&outbuf[8], "QEMU   ", 8);
 602         memcpy(&outbuf[32], QEMU_VERSION, 4);
 603         /* Identify device as SCSI-3 rev 1.
 604            Some later commands are also implemented. */
 605         outbuf[2] = 3;
 606         outbuf[3] = 2; /* Format 2 */
 607         outbuf[4] = len - 5; /* Additional Length = (Len - 1) - 4 */
 608         /* Sync data transfer and TCQ.  */
 609         outbuf[7] = 0x10 | (r->bus->tcq ? 0x02 : 0);
 610         r->iov.iov_len = len;
 611         break;
 612     case 0x16:
 613         DPRINTF("Reserve(6)\n");
 614         if (buf[1] & 1)
 615             goto fail;
 616         break;
 617     case 0x17:
 618         DPRINTF("Release(6)\n");
 619         if (buf[1] & 1)
 620             goto fail;
 621         break;
 622     case 0x1a:
 623     case 0x5a:
 624         {
 625             uint8_t *p;
 626             int page;
 627
 628             page = buf[2] & 0x3f;
 629             DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
 630             p = outbuf;
 631             memset(p, 0, 4);
 632             outbuf[1] = 0; /* Default media type.  */
 633             outbuf[3] = 0; /* Block descriptor length.  */
 634             if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
 635                 outbuf[2] = 0x80; /* Readonly.  */
 636             }
 637             p += 4;
 638             if (page == 4) {
 639                 int cylinders, heads, secs;
 640
 641                 /* Rigid disk device geometry page. */
 642                 p[0] = 4;
 643                 p[1] = 0x16;
 644                 /* if a geometry hint is available, use it */
 645                 bdrv_get_geometry_hint(s->dinfo->bdrv, &cylinders, &heads, &secs);
 646                 p[2] = (cylinders >> 16) & 0xff;
 647                 p[3] = (cylinders >> 8) & 0xff;
 648                 p[4] = cylinders & 0xff;
 649                 p[5] = heads & 0xff;
 650                 /* Write precomp start cylinder, disabled */
 651                 p[6] = (cylinders >> 16) & 0xff;
 652                 p[7] = (cylinders >> 8) & 0xff;
 653                 p[8] = cylinders & 0xff;
 654                 /* Reduced current start cylinder, disabled */
 655                 p[9] = (cylinders >> 16) & 0xff;
 656                 p[10] = (cylinders >> 8) & 0xff;
 657                 p[11] = cylinders & 0xff;
 658                 /* Device step rate [ns], 200ns */
 659                 p[12] = 0;
 660                 p[13] = 200;
 661                 /* Landing zone cylinder */
 662                 p[14] = 0xff;
 663                 p[15] =  0xff;
 664                 p[16] = 0xff;
 665                 /* Medium rotation rate [rpm], 5400 rpm */
 666                 p[20] = (5400 >> 8) & 0xff;
 667                 p[21] = 5400 & 0xff;
 668                 p += 0x16;
 669             } else if (page == 5) {
 670                 int cylinders, heads, secs;
 671
 672                 /* Flexible disk device geometry page. */
 673                 p[0] = 5;
 674                 p[1] = 0x1e;
 675                 /* Transfer rate [kbit/s], 5Mbit/s */
 676                 p[2] = 5000 >> 8;
 677                 p[3] = 5000 & 0xff;
 678                 /* if a geometry hint is available, use it */
 679                 bdrv_get_geometry_hint(s->dinfo->bdrv, &cylinders, &heads, &secs);
 680                 p[4] = heads & 0xff;
 681                 p[5] = secs & 0xff;
 682                 p[6] = s->cluster_size * 2;
 683                 p[8] = (cylinders >> 8) & 0xff;
 684                 p[9] = cylinders & 0xff;
 685                 /* Write precomp start cylinder, disabled */
 686                 p[10] = (cylinders >> 8) & 0xff;
 687                 p[11] = cylinders & 0xff;
 688                 /* Reduced current start cylinder, disabled */
 689                 p[12] = (cylinders >> 8) & 0xff;
 690                 p[13] = cylinders & 0xff;
 691                 /* Device step rate [100us], 100us */
 692                 p[14] = 0;
 693                 p[15] = 1;
 694                 /* Device step pulse width [us], 1us */
 695                 p[16] = 1;
 696                 /* Device head settle delay [100us], 100us */
 697                 p[17] = 0;
 698                 p[18] = 1;
 699                 /* Motor on delay [0.1s], 0.1s */
 700                 p[19] = 1;
 701                 /* Motor off delay [0.1s], 0.1s */
 702                 p[20] = 1;
 703                 /* Medium rotation rate [rpm], 5400 rpm */
 704                 p[28] = (5400 >> 8) & 0xff;
 705                 p[29] = 5400 & 0xff;
 706                 p += 0x1e;
 707             } else if ((page == 8 || page == 0x3f)) {
 708                 /* Caching page.  */
 709                 memset(p,0,20);
 710                 p[0] = 8;
 711                 p[1] = 0x12;
 712                 if (bdrv_enable_write_cache(s->dinfo->bdrv)) {
 713                      p[2] = 4; /* WCE */
 714                 }
 715                 p += 20;
 716             }
 717             if ((page == 0x3f || page == 0x2a)
 718                     && (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM)) {
 719                 /* CD Capabilities and Mechanical Status page. */
 720                 p[0] = 0x2a;
 721                 p[1] = 0x14;
 722                 p[2] = 3; // CD-R & CD-RW read
 723                 p[3] = 0; // Writing not supported
 724                 p[4] = 0x7f; /* Audio, composite, digital out,
 725                                          mode 2 form 1&2, multi session */
 726                 p[5] = 0xff; /* CD DA, DA accurate, RW supported,
 727                                          RW corrected, C2 errors, ISRC,
 728                                          UPC, Bar code */
 729                 p[6] = 0x2d | (bdrv_is_locked(s->dinfo->bdrv)? 2 : 0);
 730                 /* Locking supported, jumper present, eject, tray */
 731                 p[7] = 0; /* no volume & mute control, no
 732                                       changer */
 733                 p[8] = (50 * 176) >> 8; // 50x read speed
 734                 p[9] = (50 * 176) & 0xff;
 735                 p[10] = 0 >> 8; // No volume
 736                 p[11] = 0 & 0xff;
 737                 p[12] = 2048 >> 8; // 2M buffer
 738                 p[13] = 2048 & 0xff;
 739                 p[14] = (16 * 176) >> 8; // 16x read speed current
 740                 p[15] = (16 * 176) & 0xff;
 741                 p[18] = (16 * 176) >> 8; // 16x write speed
 742                 p[19] = (16 * 176) & 0xff;
 743                 p[20] = (16 * 176) >> 8; // 16x write speed current
 744                 p[21] = (16 * 176) & 0xff;
 745                 p += 22;
 746             }
 747             r->iov.iov_len = p - outbuf;
 748             outbuf[0] = r->iov.iov_len - 4;
 749             if (r->iov.iov_len > len)
 750                 r->iov.iov_len = len;
 751         }
 752         break;
 753     case 0x1b:
 754         DPRINTF("Start Stop Unit\n");
 755         if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM &&
 756             (buf[4] & 2))
 757             /* load/eject medium */
 758             bdrv_eject(s->dinfo->bdrv, !(buf[4] & 1));
 759         break;
 760     case 0x1e:
 761         DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3);
 762         bdrv_set_locked(s->dinfo->bdrv, buf[4] & 1);
 763         break;
 764     case 0x25:
 765         DPRINTF("Read Capacity\n");
 766         /* The normal LEN field for this command is zero.  */
 767         memset(outbuf, 0, 8);
 768         bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 769         nb_sectors /= s->cluster_size;
 770         /* Returned value is the address of the last sector.  */
 771         if (nb_sectors) {
 772             nb_sectors--;
 773             /* Remember the new size for read/write sanity checking. */
 774             s->max_lba = nb_sectors;
 775             /* Clip to 2TB, instead of returning capacity modulo 2TB. */
 776             if (nb_sectors > UINT32_MAX)
 777                 nb_sectors = UINT32_MAX;
 778             outbuf[0] = (nb_sectors >> 24) & 0xff;
 779             outbuf[1] = (nb_sectors >> 16) & 0xff;
 780             outbuf[2] = (nb_sectors >> 8) & 0xff;
 781             outbuf[3] = nb_sectors & 0xff;
 782             outbuf[4] = 0;
 783             outbuf[5] = 0;
 784             outbuf[6] = s->cluster_size * 2;
 785             outbuf[7] = 0;
 786             r->iov.iov_len = 8;
 787         } else {
 788         notready:
 789             scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_NOT_READY);
 790             return 0;
 791         }
 792         break;
 793     case 0x08:
 794     case 0x28:
 795     case 0x88:
 796         DPRINTF("Read (sector %" PRId64 ", count %d)\n", lba, len);
 797         if (lba > s->max_lba)
 798             goto illegal_lba;
 799         r->sector = lba * s->cluster_size;
 800         r->sector_count = len * s->cluster_size;
 801         break;
 802     case 0x0a:
 803     case 0x2a:
 804     case 0x8a:
 805         DPRINTF("Write (sector %" PRId64 ", count %d)\n", lba, len);
 806         if (lba > s->max_lba)
 807             goto illegal_lba;
 808         r->sector = lba * s->cluster_size;
 809         r->sector_count = len * s->cluster_size;
 810         is_write = 1;
 811         break;
 812     case 0x35:
 813         DPRINTF("Synchronise cache (sector %" PRId64 ", count %d)\n", lba, len);
 814         bdrv_flush(s->dinfo->bdrv);
 815         break;
 816     case 0x43:
 817         {
 818             int start_track, format, msf, toclen;
 819
 820             msf = buf[1] & 2;
 821             format = buf[2] & 0xf;
 822             start_track = buf[6];
 823             bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 824             DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1);
 825             nb_sectors /= s->cluster_size;
 826             switch(format) {
 827             case 0:
 828                 toclen = cdrom_read_toc(nb_sectors, outbuf, msf, start_track);
 829                 break;
 830             case 1:
 831                 /* multi session : only a single session defined */
 832                 toclen = 12;
 833                 memset(outbuf, 0, 12);
 834                 outbuf[1] = 0x0a;
 835                 outbuf[2] = 0x01;
 836                 outbuf[3] = 0x01;
 837                 break;
 838             case 2:
 839                 toclen = cdrom_read_toc_raw(nb_sectors, outbuf, msf, start_track);
 840                 break;
 841             default:
 842                 goto error_cmd;
 843             }
 844             if (toclen > 0) {
 845                 if (len > toclen)
 846                   len = toclen;
 847                 r->iov.iov_len = len;
 848                 break;
 849             }
 850         error_cmd:
 851             DPRINTF("Read TOC error\n");
 852             goto fail;
 853         }
 854     case 0x46:
 855         DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len);
 856         memset(outbuf, 0, 8);
 857         /* ??? This should probably return much more information.  For now
 858            just return the basic header indicating the CD-ROM profile.  */
 859         outbuf[7] = 8; // CD-ROM
 860         r->iov.iov_len = 8;
 861         break;
 862     case 0x56:
 863         DPRINTF("Reserve(10)\n");
 864         if (buf[1] & 3)
 865             goto fail;
 866         break;
 867     case 0x57:
 868         DPRINTF("Release(10)\n");
 869         if (buf[1] & 3)
 870             goto fail;
 871         break;
 872     case 0x9e:
 873         /* Service Action In subcommands. */
 874         if ((buf[1] & 31) == 0x10) {
 875             DPRINTF("SAI READ CAPACITY(16)\n");
 876             memset(outbuf, 0, len);
 877             bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 878             nb_sectors /= s->cluster_size;
 879             /* Returned value is the address of the last sector.  */
 880             if (nb_sectors) {
 881                 nb_sectors--;
 882                 /* Remember the new size for read/write sanity checking. */
 883                 s->max_lba = nb_sectors;
 884                 outbuf[0] = (nb_sectors >> 56) & 0xff;
 885                 outbuf[1] = (nb_sectors >> 48) & 0xff;
 886                 outbuf[2] = (nb_sectors >> 40) & 0xff;
 887                 outbuf[3] = (nb_sectors >> 32) & 0xff;
 888                 outbuf[4] = (nb_sectors >> 24) & 0xff;
 889                 outbuf[5] = (nb_sectors >> 16) & 0xff;
 890                 outbuf[6] = (nb_sectors >> 8) & 0xff;
 891                 outbuf[7] = nb_sectors & 0xff;
 892                 outbuf[8] = 0;
 893                 outbuf[9] = 0;
 894                 outbuf[10] = s->cluster_size * 2;
 895                 outbuf[11] = 0;
 896                 /* Protection, exponent and lowest lba field left blank. */
 897                 r->iov.iov_len = len;
 898             } else {
 899                 scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_NOT_READY);
 900                 return 0;
 901             }
 902             break;
 903         }
 904         DPRINTF("Unsupported Service Action In\n");
 905         goto fail;
 906     case 0xa0:
 907         DPRINTF("Report LUNs (len %d)\n", len);
 908         if (len < 16)
 909             goto fail;
 910         memset(outbuf, 0, 16);
 911         outbuf[3] = 8;
 912         r->iov.iov_len = 16;
 913         break;
 914     case 0x2f:
 915         DPRINTF("Verify (sector %" PRId64 ", count %d)\n", lba, len);
 916         break;
 917     default:
 918         DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]);
 919     fail:
 920         scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_ILLEGAL_REQUEST);
 921         return 0;
 922     illegal_lba:
 923         scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_HARDWARE_ERROR);
 924         return 0;
 925     }
 926     if (r->sector_count == 0 && r->iov.iov_len == 0) {
 927         scsi_command_complete(r, STATUS_GOOD, SENSE_NO_SENSE);
 928     }
 929     len = r->sector_count * 512 + r->iov.iov_len;
 930     if (is_write) {
 931         return -len;
 932     } else {
 933         if (!r->sector_count)
 934             r->sector_count = -1;
 935         return len;
 936     }
 937 }
 938
 939 static void scsi_destroy(SCSIDevice *dev)
 940 {
 941     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
 942
 943     drive_uninit(s->dinfo);
 944 }
 945
 946 static int scsi_disk_initfn(SCSIDevice *dev)
 947 {
 948     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
 949     uint64_t nb_sectors;
 950
 951     if (!s->dinfo || !s->dinfo->bdrv) {
 952         qemu_error("scsi-disk: drive property not set\n");
 953         return -1;
 954     }
 955
 956     if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
 957         s->cluster_size = 4;
 958     } else {
 959         s->cluster_size = 1;
 960     }
 961     bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 962     nb_sectors /= s->cluster_size;
 963     if (nb_sectors)
 964         nb_sectors--;
 965     s->max_lba = nb_sectors;
 966     strncpy(s->drive_serial_str, drive_get_serial(s->dinfo->bdrv),
 967             sizeof(s->drive_serial_str));
 968     if (strlen(s->drive_serial_str) == 0)
 969         pstrcpy(s->drive_serial_str, sizeof(s->drive_serial_str), "0");
 970     qemu_add_vm_change_state_handler(scsi_dma_restart_cb, s);
 971     return 0;
 972 }
 973
 974 static SCSIDeviceInfo scsi_disk_info = {
 975     .qdev.name    = "scsi-disk",
 976     .qdev.desc    = "virtual scsi disk or cdrom",
 977     .qdev.size    = sizeof(SCSIDiskState),
 978     .init         = scsi_disk_initfn,
 979     .destroy      = scsi_destroy,
 980     .send_command = scsi_send_command,
 981     .read_data    = scsi_read_data,
 982     .write_data   = scsi_write_data,
 983     .cancel_io    = scsi_cancel_io,
 984     .get_buf      = scsi_get_buf,
 985     .qdev.props   = (Property[]) {
 986         DEFINE_PROP_DRIVE("drive", SCSIDiskState, dinfo),
 987         DEFINE_PROP_END_OF_LIST(),
 988     },
 989 };
 990
 991 static void scsi_disk_register_devices(void)
 992 {
 993     scsi_qdev_register(&scsi_disk_info);
 994 }
 995 device_init(scsi_disk_register_devices)