hw/usb/dev-storage.c

   1 /*
   2  * USB Mass Storage Device emulation
   3  *
   4  * Copyright (c) 2006 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licensed under the LGPL.
   8  */
   9
  10 #include "qemu-common.h"
  11 #include "qemu/option.h"
  12 #include "qemu/config-file.h"
  13 #include "hw/usb.h"
  14 #include "hw/usb/desc.h"
  15 #include "hw/scsi/scsi.h"
  16 #include "ui/console.h"
  17 #include "monitor/monitor.h"
  18 #include "sysemu/sysemu.h"
  19 #include "sysemu/blockdev.h"
  20
  21 //#define DEBUG_MSD
  22
  23 #ifdef DEBUG_MSD
  24 #define DPRINTF(fmt, ...) \
  25 do { printf("usb-msd: " fmt , ## __VA_ARGS__); } while (0)
  26 #else
  27 #define DPRINTF(fmt, ...) do {} while(0)
  28 #endif
  29
  30 /* USB requests.  */
  31 #define MassStorageReset  0xff
  32 #define GetMaxLun         0xfe
  33
  34 enum USBMSDMode {
  35     USB_MSDM_CBW, /* Command Block.  */
  36     USB_MSDM_DATAOUT, /* Transfer data to device.  */
  37     USB_MSDM_DATAIN, /* Transfer data from device.  */
  38     USB_MSDM_CSW /* Command Status.  */
  39 };
  40
  41 struct usb_msd_csw {
  42     uint32_t sig;
  43     uint32_t tag;
  44     uint32_t residue;
  45     uint8_t status;
  46 };
  47
  48 typedef struct {
  49     USBDevice dev;
  50     enum USBMSDMode mode;
  51     uint32_t scsi_off;
  52     uint32_t scsi_len;
  53     uint32_t data_len;
  54     struct usb_msd_csw csw;
  55     SCSIRequest *req;
  56     SCSIBus bus;
  57     /* For async completion.  */
  58     USBPacket *packet;
  59     /* usb-storage only */
  60     BlockConf conf;
  61     char *serial;
  62     uint32_t removable;
  63 } MSDState;
  64
  65 struct usb_msd_cbw {
  66     uint32_t sig;
  67     uint32_t tag;
  68     uint32_t data_len;
  69     uint8_t flags;
  70     uint8_t lun;
  71     uint8_t cmd_len;
  72     uint8_t cmd[16];
  73 };
  74
  75 enum {
  76     STR_MANUFACTURER = 1,
  77     STR_PRODUCT,
  78     STR_SERIALNUMBER,
  79     STR_CONFIG_FULL,
  80     STR_CONFIG_HIGH,
  81     STR_CONFIG_SUPER,
  82 };
  83
  84 static const USBDescStrings desc_strings = {
  85     [STR_MANUFACTURER] = "QEMU",
  86     [STR_PRODUCT]      = "QEMU USB HARDDRIVE",
  87     [STR_SERIALNUMBER] = "1",
  88     [STR_CONFIG_FULL]  = "Full speed config (usb 1.1)",
  89     [STR_CONFIG_HIGH]  = "High speed config (usb 2.0)",
  90     [STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
  91 };
  92
  93 static const USBDescIface desc_iface_full = {
  94     .bInterfaceNumber              = 0,
  95     .bNumEndpoints                 = 2,
  96     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
  97     .bInterfaceSubClass            = 0x06, /* SCSI */
  98     .bInterfaceProtocol            = 0x50, /* Bulk */
  99     .eps = (USBDescEndpoint[]) {
 100         {
 101             .bEndpointAddress      = USB_DIR_IN | 0x01,
 102             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 103             .wMaxPacketSize        = 64,
 104         },{
 105             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 106             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 107             .wMaxPacketSize        = 64,
 108         },
 109     }
 110 };
 111
 112 static const USBDescDevice desc_device_full = {
 113     .bcdUSB                        = 0x0200,
 114     .bMaxPacketSize0               = 8,
 115     .bNumConfigurations            = 1,
 116     .confs = (USBDescConfig[]) {
 117         {
 118             .bNumInterfaces        = 1,
 119             .bConfigurationValue   = 1,
 120             .iConfiguration        = STR_CONFIG_FULL,
 121             .bmAttributes          = 0xc0,
 122             .nif = 1,
 123             .ifs = &desc_iface_full,
 124         },
 125     },
 126 };
 127
 128 static const USBDescIface desc_iface_high = {
 129     .bInterfaceNumber              = 0,
 130     .bNumEndpoints                 = 2,
 131     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 132     .bInterfaceSubClass            = 0x06, /* SCSI */
 133     .bInterfaceProtocol            = 0x50, /* Bulk */
 134     .eps = (USBDescEndpoint[]) {
 135         {
 136             .bEndpointAddress      = USB_DIR_IN | 0x01,
 137             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 138             .wMaxPacketSize        = 512,
 139         },{
 140             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 141             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 142             .wMaxPacketSize        = 512,
 143         },
 144     }
 145 };
 146
 147 static const USBDescDevice desc_device_high = {
 148     .bcdUSB                        = 0x0200,
 149     .bMaxPacketSize0               = 64,
 150     .bNumConfigurations            = 1,
 151     .confs = (USBDescConfig[]) {
 152         {
 153             .bNumInterfaces        = 1,
 154             .bConfigurationValue   = 1,
 155             .iConfiguration        = STR_CONFIG_HIGH,
 156             .bmAttributes          = 0xc0,
 157             .nif = 1,
 158             .ifs = &desc_iface_high,
 159         },
 160     },
 161 };
 162
 163 static const USBDescIface desc_iface_super = {
 164     .bInterfaceNumber              = 0,
 165     .bNumEndpoints                 = 2,
 166     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 167     .bInterfaceSubClass            = 0x06, /* SCSI */
 168     .bInterfaceProtocol            = 0x50, /* Bulk */
 169     .eps = (USBDescEndpoint[]) {
 170         {
 171             .bEndpointAddress      = USB_DIR_IN | 0x01,
 172             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 173             .wMaxPacketSize        = 1024,
 174             .bMaxBurst             = 15,
 175         },{
 176             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 177             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 178             .wMaxPacketSize        = 1024,
 179             .bMaxBurst             = 15,
 180         },
 181     }
 182 };
 183
 184 static const USBDescDevice desc_device_super = {
 185     .bcdUSB                        = 0x0300,
 186     .bMaxPacketSize0               = 9,
 187     .bNumConfigurations            = 1,
 188     .confs = (USBDescConfig[]) {
 189         {
 190             .bNumInterfaces        = 1,
 191             .bConfigurationValue   = 1,
 192             .iConfiguration        = STR_CONFIG_SUPER,
 193             .bmAttributes          = 0xc0,
 194             .nif = 1,
 195             .ifs = &desc_iface_super,
 196         },
 197     },
 198 };
 199
 200 static const USBDesc desc = {
 201     .id = {
 202         .idVendor          = 0x46f4, /* CRC16() of "QEMU" */
 203         .idProduct         = 0x0001,
 204         .bcdDevice         = 0,
 205         .iManufacturer     = STR_MANUFACTURER,
 206         .iProduct          = STR_PRODUCT,
 207         .iSerialNumber     = STR_SERIALNUMBER,
 208     },
 209     .full  = &desc_device_full,
 210     .high  = &desc_device_high,
 211     .super = &desc_device_super,
 212     .str   = desc_strings,
 213 };
 214
 215 static void usb_msd_copy_data(MSDState *s, USBPacket *p)
 216 {
 217     uint32_t len;
 218     len = p->iov.size - p->actual_length;
 219     if (len > s->scsi_len)
 220         len = s->scsi_len;
 221     usb_packet_copy(p, scsi_req_get_buf(s->req) + s->scsi_off, len);
 222     s->scsi_len -= len;
 223     s->scsi_off += len;
 224     s->data_len -= len;
 225     if (s->scsi_len == 0 || s->data_len == 0) {
 226         scsi_req_continue(s->req);
 227     }
 228 }
 229
 230 static void usb_msd_send_status(MSDState *s, USBPacket *p)
 231 {
 232     int len;
 233
 234     DPRINTF("Command status %d tag 0x%x, len %zd\n",
 235             s->csw.status, le32_to_cpu(s->csw.tag), p->iov.size);
 236
 237     assert(s->csw.sig == cpu_to_le32(0x53425355));
 238     len = MIN(sizeof(s->csw), p->iov.size);
 239     usb_packet_copy(p, &s->csw, len);
 240     memset(&s->csw, 0, sizeof(s->csw));
 241 }
 242
 243 static void usb_msd_packet_complete(MSDState *s)
 244 {
 245     USBPacket *p = s->packet;
 246
 247     /* Set s->packet to NULL before calling usb_packet_complete
 248        because another request may be issued before
 249        usb_packet_complete returns.  */
 250     DPRINTF("Packet complete %p\n", p);
 251     s->packet = NULL;
 252     usb_packet_complete(&s->dev, p);
 253 }
 254
 255 static void usb_msd_transfer_data(SCSIRequest *req, uint32_t len)
 256 {
 257     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 258     USBPacket *p = s->packet;
 259
 260     assert((s->mode == USB_MSDM_DATAOUT) == (req->cmd.mode == SCSI_XFER_TO_DEV));
 261     s->scsi_len = len;
 262     s->scsi_off = 0;
 263     if (p) {
 264         usb_msd_copy_data(s, p);
 265         p = s->packet;
 266         if (p && p->actual_length == p->iov.size) {
 267             p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
 268             usb_msd_packet_complete(s);
 269         }
 270     }
 271 }
 272
 273 static void usb_msd_command_complete(SCSIRequest *req, uint32_t status, size_t resid)
 274 {
 275     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 276     USBPacket *p = s->packet;
 277
 278     DPRINTF("Command complete %d tag 0x%x\n", status, req->tag);
 279
 280     s->csw.sig = cpu_to_le32(0x53425355);
 281     s->csw.tag = cpu_to_le32(req->tag);
 282     s->csw.residue = cpu_to_le32(s->data_len);
 283     s->csw.status = status != 0;
 284
 285     if (s->packet) {
 286         if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
 287             /* A deferred packet with no write data remaining must be
 288                the status read packet.  */
 289             usb_msd_send_status(s, p);
 290             s->mode = USB_MSDM_CBW;
 291         } else if (s->mode == USB_MSDM_CSW) {
 292             usb_msd_send_status(s, p);
 293             s->mode = USB_MSDM_CBW;
 294         } else {
 295             if (s->data_len) {
 296                 int len = (p->iov.size - p->actual_length);
 297                 usb_packet_skip(p, len);
 298                 s->data_len -= len;
 299             }
 300             if (s->data_len == 0) {
 301                 s->mode = USB_MSDM_CSW;
 302             }
 303         }
 304         p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
 305         usb_msd_packet_complete(s);
 306     } else if (s->data_len == 0) {
 307         s->mode = USB_MSDM_CSW;
 308     }
 309     scsi_req_unref(req);
 310     s->req = NULL;
 311 }
 312
 313 static void usb_msd_request_cancelled(SCSIRequest *req)
 314 {
 315     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 316
 317     if (req == s->req) {
 318         scsi_req_unref(s->req);
 319         s->req = NULL;
 320         s->scsi_len = 0;
 321     }
 322 }
 323
 324 static void usb_msd_handle_reset(USBDevice *dev)
 325 {
 326     MSDState *s = (MSDState *)dev;
 327
 328     DPRINTF("Reset\n");
 329     if (s->req) {
 330         scsi_req_cancel(s->req);
 331     }
 332     assert(s->req == NULL);
 333
 334     if (s->packet) {
 335         s->packet->status = USB_RET_STALL;
 336         usb_msd_packet_complete(s);
 337     }
 338
 339     s->mode = USB_MSDM_CBW;
 340 }
 341
 342 static void usb_msd_handle_control(USBDevice *dev, USBPacket *p,
 343                int request, int value, int index, int length, uint8_t *data)
 344 {
 345     MSDState *s = (MSDState *)dev;
 346     SCSIDevice *scsi_dev;
 347     int ret, maxlun;
 348
 349     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 350     if (ret >= 0) {
 351         return;
 352     }
 353
 354     switch (request) {
 355     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 356         break;
 357         /* Class specific requests.  */
 358     case ClassInterfaceOutRequest | MassStorageReset:
 359         /* Reset state ready for the next CBW.  */
 360         s->mode = USB_MSDM_CBW;
 361         break;
 362     case ClassInterfaceRequest | GetMaxLun:
 363         maxlun = 0;
 364         for (;;) {
 365             scsi_dev = scsi_device_find(&s->bus, 0, 0, maxlun+1);
 366             if (scsi_dev == NULL) {
 367                 break;
 368             }
 369             if (scsi_dev->lun != maxlun+1) {
 370                 break;
 371             }
 372             maxlun++;
 373         }
 374         DPRINTF("MaxLun %d\n", maxlun);
 375         data[0] = maxlun;
 376         p->actual_length = 1;
 377         break;
 378     default:
 379         p->status = USB_RET_STALL;
 380         break;
 381     }
 382 }
 383
 384 static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p)
 385 {
 386     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 387
 388     assert(s->packet == p);
 389     s->packet = NULL;
 390
 391     if (s->req) {
 392         scsi_req_cancel(s->req);
 393     }
 394 }
 395
 396 static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 397 {
 398     MSDState *s = (MSDState *)dev;
 399     uint32_t tag;
 400     struct usb_msd_cbw cbw;
 401     uint8_t devep = p->ep->nr;
 402     SCSIDevice *scsi_dev;
 403     uint32_t len;
 404
 405     switch (p->pid) {
 406     case USB_TOKEN_OUT:
 407         if (devep != 2)
 408             goto fail;
 409
 410         switch (s->mode) {
 411         case USB_MSDM_CBW:
 412             if (p->iov.size != 31) {
 413                 fprintf(stderr, "usb-msd: Bad CBW size");
 414                 goto fail;
 415             }
 416             usb_packet_copy(p, &cbw, 31);
 417             if (le32_to_cpu(cbw.sig) != 0x43425355) {
 418                 fprintf(stderr, "usb-msd: Bad signature %08x\n",
 419                         le32_to_cpu(cbw.sig));
 420                 goto fail;
 421             }
 422             DPRINTF("Command on LUN %d\n", cbw.lun);
 423             scsi_dev = scsi_device_find(&s->bus, 0, 0, cbw.lun);
 424             if (scsi_dev == NULL) {
 425                 fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
 426                 goto fail;
 427             }
 428             tag = le32_to_cpu(cbw.tag);
 429             s->data_len = le32_to_cpu(cbw.data_len);
 430             if (s->data_len == 0) {
 431                 s->mode = USB_MSDM_CSW;
 432             } else if (cbw.flags & 0x80) {
 433                 s->mode = USB_MSDM_DATAIN;
 434             } else {
 435                 s->mode = USB_MSDM_DATAOUT;
 436             }
 437             DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
 438                     tag, cbw.flags, cbw.cmd_len, s->data_len);
 439             assert(le32_to_cpu(s->csw.residue) == 0);
 440             s->scsi_len = 0;
 441             s->req = scsi_req_new(scsi_dev, tag, cbw.lun, cbw.cmd, NULL);
 442 #ifdef DEBUG_MSD
 443             scsi_req_print(s->req);
 444 #endif
 445             len = scsi_req_enqueue(s->req);
 446             if (len) {
 447                 scsi_req_continue(s->req);
 448             }
 449             break;
 450
 451         case USB_MSDM_DATAOUT:
 452             DPRINTF("Data out %zd/%d\n", p->iov.size, s->data_len);
 453             if (p->iov.size > s->data_len) {
 454                 goto fail;
 455             }
 456
 457             if (s->scsi_len) {
 458                 usb_msd_copy_data(s, p);
 459             }
 460             if (le32_to_cpu(s->csw.residue)) {
 461                 int len = p->iov.size - p->actual_length;
 462                 if (len) {
 463                     usb_packet_skip(p, len);
 464                     s->data_len -= len;
 465                     if (s->data_len == 0) {
 466                         s->mode = USB_MSDM_CSW;
 467                     }
 468                 }
 469             }
 470             if (p->actual_length < p->iov.size) {
 471                 DPRINTF("Deferring packet %p [wait data-out]\n", p);
 472                 s->packet = p;
 473                 p->status = USB_RET_ASYNC;
 474             }
 475             break;
 476
 477         default:
 478             DPRINTF("Unexpected write (len %zd)\n", p->iov.size);
 479             goto fail;
 480         }
 481         break;
 482
 483     case USB_TOKEN_IN:
 484         if (devep != 1)
 485             goto fail;
 486
 487         switch (s->mode) {
 488         case USB_MSDM_DATAOUT:
 489             if (s->data_len != 0 || p->iov.size < 13) {
 490                 goto fail;
 491             }
 492             /* Waiting for SCSI write to complete.  */
 493             s->packet = p;
 494             p->status = USB_RET_ASYNC;
 495             break;
 496
 497         case USB_MSDM_CSW:
 498             if (p->iov.size < 13) {
 499                 goto fail;
 500             }
 501
 502             if (s->req) {
 503                 /* still in flight */
 504                 DPRINTF("Deferring packet %p [wait status]\n", p);
 505                 s->packet = p;
 506                 p->status = USB_RET_ASYNC;
 507             } else {
 508                 usb_msd_send_status(s, p);
 509                 s->mode = USB_MSDM_CBW;
 510             }
 511             break;
 512
 513         case USB_MSDM_DATAIN:
 514             DPRINTF("Data in %zd/%d, scsi_len %d\n",
 515                     p->iov.size, s->data_len, s->scsi_len);
 516             if (s->scsi_len) {
 517                 usb_msd_copy_data(s, p);
 518             }
 519             if (le32_to_cpu(s->csw.residue)) {
 520                 int len = p->iov.size - p->actual_length;
 521                 if (len) {
 522                     usb_packet_skip(p, len);
 523                     s->data_len -= len;
 524                     if (s->data_len == 0) {
 525                         s->mode = USB_MSDM_CSW;
 526                     }
 527                 }
 528             }
 529             if (p->actual_length < p->iov.size) {
 530                 DPRINTF("Deferring packet %p [wait data-in]\n", p);
 531                 s->packet = p;
 532                 p->status = USB_RET_ASYNC;
 533             }
 534             break;
 535
 536         default:
 537             DPRINTF("Unexpected read (len %zd)\n", p->iov.size);
 538             goto fail;
 539         }
 540         break;
 541
 542     default:
 543         DPRINTF("Bad token\n");
 544     fail:
 545         p->status = USB_RET_STALL;
 546         break;
 547     }
 548 }
 549
 550 static void usb_msd_password_cb(void *opaque, int err)
 551 {
 552     MSDState *s = opaque;
 553
 554     if (!err)
 555         err = usb_device_attach(&s->dev);
 556
 557     if (err)
 558         qdev_unplug(&s->dev.qdev, NULL);
 559 }
 560
 561 static void *usb_msd_load_request(QEMUFile *f, SCSIRequest *req)
 562 {
 563     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 564
 565     /* nothing to load, just store req in our state struct */
 566     assert(s->req == NULL);
 567     scsi_req_ref(req);
 568     s->req = req;
 569     return NULL;
 570 }
 571
 572 static const struct SCSIBusInfo usb_msd_scsi_info_storage = {
 573     .tcq = false,
 574     .max_target = 0,
 575     .max_lun = 0,
 576
 577     .transfer_data = usb_msd_transfer_data,
 578     .complete = usb_msd_command_complete,
 579     .cancel = usb_msd_request_cancelled,
 580     .load_request = usb_msd_load_request,
 581 };
 582
 583 static const struct SCSIBusInfo usb_msd_scsi_info_bot = {
 584     .tcq = false,
 585     .max_target = 0,
 586     .max_lun = 15,
 587
 588     .transfer_data = usb_msd_transfer_data,
 589     .complete = usb_msd_command_complete,
 590     .cancel = usb_msd_request_cancelled,
 591     .load_request = usb_msd_load_request,
 592 };
 593
 594 static int usb_msd_initfn_storage(USBDevice *dev)
 595 {
 596     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 597     BlockDriverState *bs = s->conf.bs;
 598     SCSIDevice *scsi_dev;
 599
 600     if (!bs) {
 601         error_report("drive property not set");
 602         return -1;
 603     }
 604
 605     blkconf_serial(&s->conf, &s->serial);
 606
 607     /*
 608      * Hack alert: this pretends to be a block device, but it's really
 609      * a SCSI bus that can serve only a single device, which it
 610      * creates automatically.  But first it needs to detach from its
 611      * blockdev, or else scsi_bus_legacy_add_drive() dies when it
 612      * attaches again.
 613      *
 614      * The hack is probably a bad idea.
 615      */
 616     bdrv_detach_dev(bs, &s->dev.qdev);
 617     s->conf.bs = NULL;
 618
 619     if (s->serial) {
 620         usb_desc_set_string(dev, STR_SERIALNUMBER, s->serial);
 621     } else {
 622         usb_desc_create_serial(dev);
 623     }
 624
 625     usb_desc_init(dev);
 626     scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info_storage);
 627     scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable,
 628                                             s->conf.bootindex, s->serial);
 629     if (!scsi_dev) {
 630         return -1;
 631     }
 632     s->bus.qbus.allow_hotplug = 0;
 633     usb_msd_handle_reset(dev);
 634
 635     if (bdrv_key_required(bs)) {
 636         if (cur_mon) {
 637             monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s);
 638             s->dev.auto_attach = 0;
 639         } else {
 640             autostart = 0;
 641         }
 642     }
 643
 644     return 0;
 645 }
 646
 647 static int usb_msd_initfn_bot(USBDevice *dev)
 648 {
 649     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 650
 651     usb_desc_create_serial(dev);
 652     usb_desc_init(dev);
 653     scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info_bot);
 654     s->bus.qbus.allow_hotplug = 0;
 655     usb_msd_handle_reset(dev);
 656
 657     return 0;
 658 }
 659
 660 static USBDevice *usb_msd_init(USBBus *bus, const char *filename)
 661 {
 662     static int nr=0;
 663     char id[8];
 664     QemuOpts *opts;
 665     DriveInfo *dinfo;
 666     USBDevice *dev;
 667     const char *p1;
 668     char fmt[32];
 669
 670     /* parse -usbdevice disk: syntax into drive opts */
 671     snprintf(id, sizeof(id), "usb%d", nr++);
 672     opts = qemu_opts_create(qemu_find_opts("drive"), id, 0, NULL);
 673
 674     p1 = strchr(filename, ':');
 675     if (p1++) {
 676         const char *p2;
 677
 678         if (strstart(filename, "format=", &p2)) {
 679             int len = MIN(p1 - p2, sizeof(fmt));
 680             pstrcpy(fmt, len, p2);
 681             qemu_opt_set(opts, "format", fmt);
 682         } else if (*filename != ':') {
 683             printf("unrecognized USB mass-storage option %s\n", filename);
 684             return NULL;
 685         }
 686         filename = p1;
 687     }
 688     if (!*filename) {
 689         printf("block device specification needed\n");
 690         return NULL;
 691     }
 692     qemu_opt_set(opts, "file", filename);
 693     qemu_opt_set(opts, "if", "none");
 694
 695     /* create host drive */
 696     dinfo = drive_init(opts, 0);
 697     if (!dinfo) {
 698         qemu_opts_del(opts);
 699         return NULL;
 700     }
 701
 702     /* create guest device */
 703     dev = usb_create(bus, "usb-storage");
 704     if (!dev) {
 705         return NULL;
 706     }
 707     if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 708         qdev_free(&dev->qdev);
 709         return NULL;
 710     }
 711     if (qdev_init(&dev->qdev) < 0)
 712         return NULL;
 713
 714     return dev;
 715 }
 716
 717 static const VMStateDescription vmstate_usb_msd = {
 718     .name = "usb-storage",
 719     .version_id = 1,
 720     .minimum_version_id = 1,
 721     .fields = (VMStateField []) {
 722         VMSTATE_USB_DEVICE(dev, MSDState),
 723         VMSTATE_UINT32(mode, MSDState),
 724         VMSTATE_UINT32(scsi_len, MSDState),
 725         VMSTATE_UINT32(scsi_off, MSDState),
 726         VMSTATE_UINT32(data_len, MSDState),
 727         VMSTATE_UINT32(csw.sig, MSDState),
 728         VMSTATE_UINT32(csw.tag, MSDState),
 729         VMSTATE_UINT32(csw.residue, MSDState),
 730         VMSTATE_UINT8(csw.status, MSDState),
 731         VMSTATE_END_OF_LIST()
 732     }
 733 };
 734
 735 static Property msd_properties[] = {
 736     DEFINE_BLOCK_PROPERTIES(MSDState, conf),
 737     DEFINE_PROP_STRING("serial", MSDState, serial),
 738     DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
 739     DEFINE_PROP_END_OF_LIST(),
 740 };
 741
 742 static void usb_msd_class_initfn_common(ObjectClass *klass)
 743 {
 744     DeviceClass *dc = DEVICE_CLASS(klass);
 745     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 746
 747     uc->product_desc   = "QEMU USB MSD";
 748     uc->usb_desc       = &desc;
 749     uc->cancel_packet  = usb_msd_cancel_io;
 750     uc->handle_attach  = usb_desc_attach;
 751     uc->handle_reset   = usb_msd_handle_reset;
 752     uc->handle_control = usb_msd_handle_control;
 753     uc->handle_data    = usb_msd_handle_data;
 754     dc->fw_name = "storage";
 755     dc->vmsd = &vmstate_usb_msd;
 756 }
 757
 758 static void usb_msd_class_initfn_storage(ObjectClass *klass, void *data)
 759 {
 760     DeviceClass *dc = DEVICE_CLASS(klass);
 761     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 762
 763     uc->init = usb_msd_initfn_storage;
 764     dc->props = msd_properties;
 765     usb_msd_class_initfn_common(klass);
 766 }
 767
 768 static void usb_msd_class_initfn_bot(ObjectClass *klass, void *data)
 769 {
 770     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 771
 772     uc->init = usb_msd_initfn_bot;
 773     usb_msd_class_initfn_common(klass);
 774 }
 775
 776 static const TypeInfo msd_info = {
 777     .name          = "usb-storage",
 778     .parent        = TYPE_USB_DEVICE,
 779     .instance_size = sizeof(MSDState),
 780     .class_init    = usb_msd_class_initfn_storage,
 781 };
 782
 783 static const TypeInfo bot_info = {
 784     .name          = "usb-bot",
 785     .parent        = TYPE_USB_DEVICE,
 786     .instance_size = sizeof(MSDState),
 787     .class_init    = usb_msd_class_initfn_bot,
 788 };
 789
 790 static void usb_msd_register_types(void)
 791 {
 792     type_register_static(&msd_info);
 793     type_register_static(&bot_info);
 794     usb_legacy_register("usb-storage", "disk", usb_msd_init);
 795 }
 796
 797 type_init(usb_msd_register_types)