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             int dbd;
 628
 629             dbd = buf[1]  & 0x8;
 630             page = buf[2] & 0x3f;
 631             DPRINTF("Mode Sense (page %d, len %d)\n", page, len);
 632             p = outbuf;
 633             memset(p, 0, 4);
 634             outbuf[1] = 0; /* Default media type.  */
 635             outbuf[3] = 0; /* Block descriptor length.  */
 636             if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
 637                 outbuf[2] = 0x80; /* Readonly.  */
 638             }
 639             p += 4;
 640             bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 641             if ((~dbd) & nb_sectors) {
 642                 nb_sectors /= s->cluster_size;
 643                 nb_sectors--;
 644                 if (nb_sectors > 0xffffff)
 645                     nb_sectors = 0xffffff;
 646                 outbuf[3] = 8; /* Block descriptor length  */
 647                 p[0] = 0; /* media density code */
 648                 p[1] = (nb_sectors >> 16) & 0xff;
 649                 p[2] = (nb_sectors >> 8) & 0xff;
 650                 p[3] = nb_sectors & 0xff;
 651                 p[4] = 0; /* reserved */
 652                 p[5] = 0; /* bytes 5-7 are the sector size in bytes */
 653                 p[6] = s->cluster_size * 2;
 654                 p[7] = 0;
 655                 p += 8;
 656             }
 657
 658             if (page == 4) {
 659                 int cylinders, heads, secs;
 660
 661                 /* Rigid disk device geometry page. */
 662                 p[0] = 4;
 663                 p[1] = 0x16;
 664                 /* if a geometry hint is available, use it */
 665                 bdrv_get_geometry_hint(s->dinfo->bdrv, &cylinders, &heads, &secs);
 666                 p[2] = (cylinders >> 16) & 0xff;
 667                 p[3] = (cylinders >> 8) & 0xff;
 668                 p[4] = cylinders & 0xff;
 669                 p[5] = heads & 0xff;
 670                 /* Write precomp start cylinder, disabled */
 671                 p[6] = (cylinders >> 16) & 0xff;
 672                 p[7] = (cylinders >> 8) & 0xff;
 673                 p[8] = cylinders & 0xff;
 674                 /* Reduced current start cylinder, disabled */
 675                 p[9] = (cylinders >> 16) & 0xff;
 676                 p[10] = (cylinders >> 8) & 0xff;
 677                 p[11] = cylinders & 0xff;
 678                 /* Device step rate [ns], 200ns */
 679                 p[12] = 0;
 680                 p[13] = 200;
 681                 /* Landing zone cylinder */
 682                 p[14] = 0xff;
 683                 p[15] =  0xff;
 684                 p[16] = 0xff;
 685                 /* Medium rotation rate [rpm], 5400 rpm */
 686                 p[20] = (5400 >> 8) & 0xff;
 687                 p[21] = 5400 & 0xff;
 688                 p += 0x16;
 689             } else if (page == 5) {
 690                 int cylinders, heads, secs;
 691
 692                 /* Flexible disk device geometry page. */
 693                 p[0] = 5;
 694                 p[1] = 0x1e;
 695                 /* Transfer rate [kbit/s], 5Mbit/s */
 696                 p[2] = 5000 >> 8;
 697                 p[3] = 5000 & 0xff;
 698                 /* if a geometry hint is available, use it */
 699                 bdrv_get_geometry_hint(s->dinfo->bdrv, &cylinders, &heads, &secs);
 700                 p[4] = heads & 0xff;
 701                 p[5] = secs & 0xff;
 702                 p[6] = s->cluster_size * 2;
 703                 p[8] = (cylinders >> 8) & 0xff;
 704                 p[9] = cylinders & 0xff;
 705                 /* Write precomp start cylinder, disabled */
 706                 p[10] = (cylinders >> 8) & 0xff;
 707                 p[11] = cylinders & 0xff;
 708                 /* Reduced current start cylinder, disabled */
 709                 p[12] = (cylinders >> 8) & 0xff;
 710                 p[13] = cylinders & 0xff;
 711                 /* Device step rate [100us], 100us */
 712                 p[14] = 0;
 713                 p[15] = 1;
 714                 /* Device step pulse width [us], 1us */
 715                 p[16] = 1;
 716                 /* Device head settle delay [100us], 100us */
 717                 p[17] = 0;
 718                 p[18] = 1;
 719                 /* Motor on delay [0.1s], 0.1s */
 720                 p[19] = 1;
 721                 /* Motor off delay [0.1s], 0.1s */
 722                 p[20] = 1;
 723                 /* Medium rotation rate [rpm], 5400 rpm */
 724                 p[28] = (5400 >> 8) & 0xff;
 725                 p[29] = 5400 & 0xff;
 726                 p += 0x1e;
 727             } else if ((page == 8 || page == 0x3f)) {
 728                 /* Caching page.  */
 729                 memset(p,0,20);
 730                 p[0] = 8;
 731                 p[1] = 0x12;
 732                 if (bdrv_enable_write_cache(s->dinfo->bdrv)) {
 733                      p[2] = 4; /* WCE */
 734                 }
 735                 p += 20;
 736             }
 737             if ((page == 0x3f || page == 0x2a)
 738                     && (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM)) {
 739                 /* CD Capabilities and Mechanical Status page. */
 740                 p[0] = 0x2a;
 741                 p[1] = 0x14;
 742                 p[2] = 3; // CD-R & CD-RW read
 743                 p[3] = 0; // Writing not supported
 744                 p[4] = 0x7f; /* Audio, composite, digital out,
 745                                          mode 2 form 1&2, multi session */
 746                 p[5] = 0xff; /* CD DA, DA accurate, RW supported,
 747                                          RW corrected, C2 errors, ISRC,
 748                                          UPC, Bar code */
 749                 p[6] = 0x2d | (bdrv_is_locked(s->dinfo->bdrv)? 2 : 0);
 750                 /* Locking supported, jumper present, eject, tray */
 751                 p[7] = 0; /* no volume & mute control, no
 752                                       changer */
 753                 p[8] = (50 * 176) >> 8; // 50x read speed
 754                 p[9] = (50 * 176) & 0xff;
 755                 p[10] = 0 >> 8; // No volume
 756                 p[11] = 0 & 0xff;
 757                 p[12] = 2048 >> 8; // 2M buffer
 758                 p[13] = 2048 & 0xff;
 759                 p[14] = (16 * 176) >> 8; // 16x read speed current
 760                 p[15] = (16 * 176) & 0xff;
 761                 p[18] = (16 * 176) >> 8; // 16x write speed
 762                 p[19] = (16 * 176) & 0xff;
 763                 p[20] = (16 * 176) >> 8; // 16x write speed current
 764                 p[21] = (16 * 176) & 0xff;
 765                 p += 22;
 766             }
 767             r->iov.iov_len = p - outbuf;
 768             outbuf[0] = r->iov.iov_len - 4;
 769             if (r->iov.iov_len > len)
 770                 r->iov.iov_len = len;
 771         }
 772         break;
 773     case 0x1b:
 774         DPRINTF("Start Stop Unit\n");
 775         if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM &&
 776             (buf[4] & 2))
 777             /* load/eject medium */
 778             bdrv_eject(s->dinfo->bdrv, !(buf[4] & 1));
 779         break;
 780     case 0x1e:
 781         DPRINTF("Prevent Allow Medium Removal (prevent = %d)\n", buf[4] & 3);
 782         bdrv_set_locked(s->dinfo->bdrv, buf[4] & 1);
 783         break;
 784     case 0x25:
 785         DPRINTF("Read Capacity\n");
 786         /* The normal LEN field for this command is zero.  */
 787         memset(outbuf, 0, 8);
 788         bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 789         nb_sectors /= s->cluster_size;
 790         /* Returned value is the address of the last sector.  */
 791         if (nb_sectors) {
 792             nb_sectors--;
 793             /* Remember the new size for read/write sanity checking. */
 794             s->max_lba = nb_sectors;
 795             /* Clip to 2TB, instead of returning capacity modulo 2TB. */
 796             if (nb_sectors > UINT32_MAX)
 797                 nb_sectors = UINT32_MAX;
 798             outbuf[0] = (nb_sectors >> 24) & 0xff;
 799             outbuf[1] = (nb_sectors >> 16) & 0xff;
 800             outbuf[2] = (nb_sectors >> 8) & 0xff;
 801             outbuf[3] = nb_sectors & 0xff;
 802             outbuf[4] = 0;
 803             outbuf[5] = 0;
 804             outbuf[6] = s->cluster_size * 2;
 805             outbuf[7] = 0;
 806             r->iov.iov_len = 8;
 807         } else {
 808         notready:
 809             scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_NOT_READY);
 810             return 0;
 811         }
 812         break;
 813     case 0x08:
 814     case 0x28:
 815     case 0x88:
 816         DPRINTF("Read (sector %" PRId64 ", count %d)\n", lba, len);
 817         if (lba > s->max_lba)
 818             goto illegal_lba;
 819         r->sector = lba * s->cluster_size;
 820         r->sector_count = len * s->cluster_size;
 821         break;
 822     case 0x0a:
 823     case 0x2a:
 824     case 0x8a:
 825         DPRINTF("Write (sector %" PRId64 ", count %d)\n", lba, len);
 826         if (lba > s->max_lba)
 827             goto illegal_lba;
 828         r->sector = lba * s->cluster_size;
 829         r->sector_count = len * s->cluster_size;
 830         is_write = 1;
 831         break;
 832     case 0x35:
 833         DPRINTF("Synchronise cache (sector %" PRId64 ", count %d)\n", lba, len);
 834         bdrv_flush(s->dinfo->bdrv);
 835         break;
 836     case 0x43:
 837         {
 838             int start_track, format, msf, toclen;
 839
 840             msf = buf[1] & 2;
 841             format = buf[2] & 0xf;
 842             start_track = buf[6];
 843             bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 844             DPRINTF("Read TOC (track %d format %d msf %d)\n", start_track, format, msf >> 1);
 845             nb_sectors /= s->cluster_size;
 846             switch(format) {
 847             case 0:
 848                 toclen = cdrom_read_toc(nb_sectors, outbuf, msf, start_track);
 849                 break;
 850             case 1:
 851                 /* multi session : only a single session defined */
 852                 toclen = 12;
 853                 memset(outbuf, 0, 12);
 854                 outbuf[1] = 0x0a;
 855                 outbuf[2] = 0x01;
 856                 outbuf[3] = 0x01;
 857                 break;
 858             case 2:
 859                 toclen = cdrom_read_toc_raw(nb_sectors, outbuf, msf, start_track);
 860                 break;
 861             default:
 862                 goto error_cmd;
 863             }
 864             if (toclen > 0) {
 865                 if (len > toclen)
 866                   len = toclen;
 867                 r->iov.iov_len = len;
 868                 break;
 869             }
 870         error_cmd:
 871             DPRINTF("Read TOC error\n");
 872             goto fail;
 873         }
 874     case 0x46:
 875         DPRINTF("Get Configuration (rt %d, maxlen %d)\n", buf[1] & 3, len);
 876         memset(outbuf, 0, 8);
 877         /* ??? This should probably return much more information.  For now
 878            just return the basic header indicating the CD-ROM profile.  */
 879         outbuf[7] = 8; // CD-ROM
 880         r->iov.iov_len = 8;
 881         break;
 882     case 0x56:
 883         DPRINTF("Reserve(10)\n");
 884         if (buf[1] & 3)
 885             goto fail;
 886         break;
 887     case 0x57:
 888         DPRINTF("Release(10)\n");
 889         if (buf[1] & 3)
 890             goto fail;
 891         break;
 892     case 0x9e:
 893         /* Service Action In subcommands. */
 894         if ((buf[1] & 31) == 0x10) {
 895             DPRINTF("SAI READ CAPACITY(16)\n");
 896             memset(outbuf, 0, len);
 897             bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 898             nb_sectors /= s->cluster_size;
 899             /* Returned value is the address of the last sector.  */
 900             if (nb_sectors) {
 901                 nb_sectors--;
 902                 /* Remember the new size for read/write sanity checking. */
 903                 s->max_lba = nb_sectors;
 904                 outbuf[0] = (nb_sectors >> 56) & 0xff;
 905                 outbuf[1] = (nb_sectors >> 48) & 0xff;
 906                 outbuf[2] = (nb_sectors >> 40) & 0xff;
 907                 outbuf[3] = (nb_sectors >> 32) & 0xff;
 908                 outbuf[4] = (nb_sectors >> 24) & 0xff;
 909                 outbuf[5] = (nb_sectors >> 16) & 0xff;
 910                 outbuf[6] = (nb_sectors >> 8) & 0xff;
 911                 outbuf[7] = nb_sectors & 0xff;
 912                 outbuf[8] = 0;
 913                 outbuf[9] = 0;
 914                 outbuf[10] = s->cluster_size * 2;
 915                 outbuf[11] = 0;
 916                 /* Protection, exponent and lowest lba field left blank. */
 917                 r->iov.iov_len = len;
 918             } else {
 919                 scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_NOT_READY);
 920                 return 0;
 921             }
 922             break;
 923         }
 924         DPRINTF("Unsupported Service Action In\n");
 925         goto fail;
 926     case 0xa0:
 927         DPRINTF("Report LUNs (len %d)\n", len);
 928         if (len < 16)
 929             goto fail;
 930         memset(outbuf, 0, 16);
 931         outbuf[3] = 8;
 932         r->iov.iov_len = 16;
 933         break;
 934     case 0x2f:
 935         DPRINTF("Verify (sector %" PRId64 ", count %d)\n", lba, len);
 936         break;
 937     default:
 938         DPRINTF("Unknown SCSI command (%2.2x)\n", buf[0]);
 939     fail:
 940         scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_ILLEGAL_REQUEST);
 941         return 0;
 942     illegal_lba:
 943         scsi_command_complete(r, STATUS_CHECK_CONDITION, SENSE_HARDWARE_ERROR);
 944         return 0;
 945     }
 946     if (r->sector_count == 0 && r->iov.iov_len == 0) {
 947         scsi_command_complete(r, STATUS_GOOD, SENSE_NO_SENSE);
 948     }
 949     len = r->sector_count * 512 + r->iov.iov_len;
 950     if (is_write) {
 951         return -len;
 952     } else {
 953         if (!r->sector_count)
 954             r->sector_count = -1;
 955         return len;
 956     }
 957 }
 958
 959 static void scsi_destroy(SCSIDevice *dev)
 960 {
 961     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
 962
 963     drive_uninit(s->dinfo);
 964 }
 965
 966 static int scsi_disk_initfn(SCSIDevice *dev)
 967 {
 968     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, dev);
 969     uint64_t nb_sectors;
 970
 971     if (!s->dinfo || !s->dinfo->bdrv) {
 972         qemu_error("scsi-disk: drive property not set\n");
 973         return -1;
 974     }
 975
 976     if (bdrv_get_type_hint(s->dinfo->bdrv) == BDRV_TYPE_CDROM) {
 977         s->cluster_size = 4;
 978     } else {
 979         s->cluster_size = 1;
 980     }
 981     bdrv_get_geometry(s->dinfo->bdrv, &nb_sectors);
 982     nb_sectors /= s->cluster_size;
 983     if (nb_sectors)
 984         nb_sectors--;
 985     s->max_lba = nb_sectors;
 986     strncpy(s->drive_serial_str, drive_get_serial(s->dinfo->bdrv),
 987             sizeof(s->drive_serial_str));
 988     if (strlen(s->drive_serial_str) == 0)
 989         pstrcpy(s->drive_serial_str, sizeof(s->drive_serial_str), "0");
 990     qemu_add_vm_change_state_handler(scsi_dma_restart_cb, s);
 991     return 0;
 992 }
 993
 994 static SCSIDeviceInfo scsi_disk_info = {
 995     .qdev.name    = "scsi-disk",
 996     .qdev.desc    = "virtual scsi disk or cdrom",
 997     .qdev.size    = sizeof(SCSIDiskState),
 998     .init         = scsi_disk_initfn,
 999     .destroy      = scsi_destroy,
1000     .send_command = scsi_send_command,
1001     .read_data    = scsi_read_data,
1002     .write_data   = scsi_write_data,
1003     .cancel_io    = scsi_cancel_io,
1004     .get_buf      = scsi_get_buf,
1005     .qdev.props   = (Property[]) {
1006         DEFINE_PROP_DRIVE("drive", SCSIDiskState, dinfo),
1007         DEFINE_PROP_END_OF_LIST(),
1008     },
1009 };
1010
1011 static void scsi_disk_register_devices(void)
1012 {
1013     scsi_qdev_register(&scsi_disk_info);
1014 }
1015 device_init(scsi_disk_register_devices)