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/block-backend.h"
  20 #include "sysemu/blockdev.h"
  21 #include "qapi/visitor.h"
  22
  23 //#define DEBUG_MSD
  24
  25 #ifdef DEBUG_MSD
  26 #define DPRINTF(fmt, ...) \
  27 do { printf("usb-msd: " fmt , ## __VA_ARGS__); } while (0)
  28 #else
  29 #define DPRINTF(fmt, ...) do {} while(0)
  30 #endif
  31
  32 /* USB requests.  */
  33 #define MassStorageReset  0xff
  34 #define GetMaxLun         0xfe
  35
  36 enum USBMSDMode {
  37     USB_MSDM_CBW, /* Command Block.  */
  38     USB_MSDM_DATAOUT, /* Transfer data to device.  */
  39     USB_MSDM_DATAIN, /* Transfer data from device.  */
  40     USB_MSDM_CSW /* Command Status.  */
  41 };
  42
  43 struct usb_msd_csw {
  44     uint32_t sig;
  45     uint32_t tag;
  46     uint32_t residue;
  47     uint8_t status;
  48 };
  49
  50 typedef struct {
  51     USBDevice dev;
  52     enum USBMSDMode mode;
  53     uint32_t scsi_off;
  54     uint32_t scsi_len;
  55     uint32_t data_len;
  56     struct usb_msd_csw csw;
  57     SCSIRequest *req;
  58     SCSIBus bus;
  59     /* For async completion.  */
  60     USBPacket *packet;
  61     /* usb-storage only */
  62     BlockConf conf;
  63     uint32_t removable;
  64     SCSIDevice *scsi_dev;
  65 } MSDState;
  66
  67 struct usb_msd_cbw {
  68     uint32_t sig;
  69     uint32_t tag;
  70     uint32_t data_len;
  71     uint8_t flags;
  72     uint8_t lun;
  73     uint8_t cmd_len;
  74     uint8_t cmd[16];
  75 };
  76
  77 enum {
  78     STR_MANUFACTURER = 1,
  79     STR_PRODUCT,
  80     STR_SERIALNUMBER,
  81     STR_CONFIG_FULL,
  82     STR_CONFIG_HIGH,
  83     STR_CONFIG_SUPER,
  84 };
  85
  86 static const USBDescStrings desc_strings = {
  87     [STR_MANUFACTURER] = "QEMU",
  88     [STR_PRODUCT]      = "QEMU USB HARDDRIVE",
  89     [STR_SERIALNUMBER] = "1",
  90     [STR_CONFIG_FULL]  = "Full speed config (usb 1.1)",
  91     [STR_CONFIG_HIGH]  = "High speed config (usb 2.0)",
  92     [STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
  93 };
  94
  95 static const USBDescIface desc_iface_full = {
  96     .bInterfaceNumber              = 0,
  97     .bNumEndpoints                 = 2,
  98     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
  99     .bInterfaceSubClass            = 0x06, /* SCSI */
 100     .bInterfaceProtocol            = 0x50, /* Bulk */
 101     .eps = (USBDescEndpoint[]) {
 102         {
 103             .bEndpointAddress      = USB_DIR_IN | 0x01,
 104             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 105             .wMaxPacketSize        = 64,
 106         },{
 107             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 108             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 109             .wMaxPacketSize        = 64,
 110         },
 111     }
 112 };
 113
 114 static const USBDescDevice desc_device_full = {
 115     .bcdUSB                        = 0x0200,
 116     .bMaxPacketSize0               = 8,
 117     .bNumConfigurations            = 1,
 118     .confs = (USBDescConfig[]) {
 119         {
 120             .bNumInterfaces        = 1,
 121             .bConfigurationValue   = 1,
 122             .iConfiguration        = STR_CONFIG_FULL,
 123             .bmAttributes          = USB_CFG_ATT_ONE | USB_CFG_ATT_SELFPOWER,
 124             .nif = 1,
 125             .ifs = &desc_iface_full,
 126         },
 127     },
 128 };
 129
 130 static const USBDescIface desc_iface_high = {
 131     .bInterfaceNumber              = 0,
 132     .bNumEndpoints                 = 2,
 133     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 134     .bInterfaceSubClass            = 0x06, /* SCSI */
 135     .bInterfaceProtocol            = 0x50, /* Bulk */
 136     .eps = (USBDescEndpoint[]) {
 137         {
 138             .bEndpointAddress      = USB_DIR_IN | 0x01,
 139             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 140             .wMaxPacketSize        = 512,
 141         },{
 142             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 143             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 144             .wMaxPacketSize        = 512,
 145         },
 146     }
 147 };
 148
 149 static const USBDescDevice desc_device_high = {
 150     .bcdUSB                        = 0x0200,
 151     .bMaxPacketSize0               = 64,
 152     .bNumConfigurations            = 1,
 153     .confs = (USBDescConfig[]) {
 154         {
 155             .bNumInterfaces        = 1,
 156             .bConfigurationValue   = 1,
 157             .iConfiguration        = STR_CONFIG_HIGH,
 158             .bmAttributes          = USB_CFG_ATT_ONE | USB_CFG_ATT_SELFPOWER,
 159             .nif = 1,
 160             .ifs = &desc_iface_high,
 161         },
 162     },
 163 };
 164
 165 static const USBDescIface desc_iface_super = {
 166     .bInterfaceNumber              = 0,
 167     .bNumEndpoints                 = 2,
 168     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 169     .bInterfaceSubClass            = 0x06, /* SCSI */
 170     .bInterfaceProtocol            = 0x50, /* Bulk */
 171     .eps = (USBDescEndpoint[]) {
 172         {
 173             .bEndpointAddress      = USB_DIR_IN | 0x01,
 174             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 175             .wMaxPacketSize        = 1024,
 176             .bMaxBurst             = 15,
 177         },{
 178             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 179             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 180             .wMaxPacketSize        = 1024,
 181             .bMaxBurst             = 15,
 182         },
 183     }
 184 };
 185
 186 static const USBDescDevice desc_device_super = {
 187     .bcdUSB                        = 0x0300,
 188     .bMaxPacketSize0               = 9,
 189     .bNumConfigurations            = 1,
 190     .confs = (USBDescConfig[]) {
 191         {
 192             .bNumInterfaces        = 1,
 193             .bConfigurationValue   = 1,
 194             .iConfiguration        = STR_CONFIG_SUPER,
 195             .bmAttributes          = USB_CFG_ATT_ONE | USB_CFG_ATT_SELFPOWER,
 196             .nif = 1,
 197             .ifs = &desc_iface_super,
 198         },
 199     },
 200 };
 201
 202 static const USBDesc desc = {
 203     .id = {
 204         .idVendor          = 0x46f4, /* CRC16() of "QEMU" */
 205         .idProduct         = 0x0001,
 206         .bcdDevice         = 0,
 207         .iManufacturer     = STR_MANUFACTURER,
 208         .iProduct          = STR_PRODUCT,
 209         .iSerialNumber     = STR_SERIALNUMBER,
 210     },
 211     .full  = &desc_device_full,
 212     .high  = &desc_device_high,
 213     .super = &desc_device_super,
 214     .str   = desc_strings,
 215 };
 216
 217 static void usb_msd_copy_data(MSDState *s, USBPacket *p)
 218 {
 219     uint32_t len;
 220     len = p->iov.size - p->actual_length;
 221     if (len > s->scsi_len)
 222         len = s->scsi_len;
 223     usb_packet_copy(p, scsi_req_get_buf(s->req) + s->scsi_off, len);
 224     s->scsi_len -= len;
 225     s->scsi_off += len;
 226     s->data_len -= len;
 227     if (s->scsi_len == 0 || s->data_len == 0) {
 228         scsi_req_continue(s->req);
 229     }
 230 }
 231
 232 static void usb_msd_send_status(MSDState *s, USBPacket *p)
 233 {
 234     int len;
 235
 236     DPRINTF("Command status %d tag 0x%x, len %zd\n",
 237             s->csw.status, le32_to_cpu(s->csw.tag), p->iov.size);
 238
 239     assert(s->csw.sig == cpu_to_le32(0x53425355));
 240     len = MIN(sizeof(s->csw), p->iov.size);
 241     usb_packet_copy(p, &s->csw, len);
 242     memset(&s->csw, 0, sizeof(s->csw));
 243 }
 244
 245 static void usb_msd_packet_complete(MSDState *s)
 246 {
 247     USBPacket *p = s->packet;
 248
 249     /* Set s->packet to NULL before calling usb_packet_complete
 250        because another request may be issued before
 251        usb_packet_complete returns.  */
 252     DPRINTF("Packet complete %p\n", p);
 253     s->packet = NULL;
 254     usb_packet_complete(&s->dev, p);
 255 }
 256
 257 static void usb_msd_transfer_data(SCSIRequest *req, uint32_t len)
 258 {
 259     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 260     USBPacket *p = s->packet;
 261
 262     assert((s->mode == USB_MSDM_DATAOUT) == (req->cmd.mode == SCSI_XFER_TO_DEV));
 263     s->scsi_len = len;
 264     s->scsi_off = 0;
 265     if (p) {
 266         usb_msd_copy_data(s, p);
 267         p = s->packet;
 268         if (p && p->actual_length == p->iov.size) {
 269             p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
 270             usb_msd_packet_complete(s);
 271         }
 272     }
 273 }
 274
 275 static void usb_msd_command_complete(SCSIRequest *req, uint32_t status, size_t resid)
 276 {
 277     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 278     USBPacket *p = s->packet;
 279
 280     DPRINTF("Command complete %d tag 0x%x\n", status, req->tag);
 281
 282     s->csw.sig = cpu_to_le32(0x53425355);
 283     s->csw.tag = cpu_to_le32(req->tag);
 284     s->csw.residue = cpu_to_le32(s->data_len);
 285     s->csw.status = status != 0;
 286
 287     if (s->packet) {
 288         if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
 289             /* A deferred packet with no write data remaining must be
 290                the status read packet.  */
 291             usb_msd_send_status(s, p);
 292             s->mode = USB_MSDM_CBW;
 293         } else if (s->mode == USB_MSDM_CSW) {
 294             usb_msd_send_status(s, p);
 295             s->mode = USB_MSDM_CBW;
 296         } else {
 297             if (s->data_len) {
 298                 int len = (p->iov.size - p->actual_length);
 299                 usb_packet_skip(p, len);
 300                 s->data_len -= len;
 301             }
 302             if (s->data_len == 0) {
 303                 s->mode = USB_MSDM_CSW;
 304             }
 305         }
 306         p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
 307         usb_msd_packet_complete(s);
 308     } else if (s->data_len == 0) {
 309         s->mode = USB_MSDM_CSW;
 310     }
 311     scsi_req_unref(req);
 312     s->req = NULL;
 313 }
 314
 315 static void usb_msd_request_cancelled(SCSIRequest *req)
 316 {
 317     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 318
 319     if (req == s->req) {
 320         scsi_req_unref(s->req);
 321         s->req = NULL;
 322         s->scsi_len = 0;
 323     }
 324 }
 325
 326 static void usb_msd_handle_reset(USBDevice *dev)
 327 {
 328     MSDState *s = (MSDState *)dev;
 329
 330     DPRINTF("Reset\n");
 331     if (s->req) {
 332         scsi_req_cancel(s->req);
 333     }
 334     assert(s->req == NULL);
 335
 336     if (s->packet) {
 337         s->packet->status = USB_RET_STALL;
 338         usb_msd_packet_complete(s);
 339     }
 340
 341     s->mode = USB_MSDM_CBW;
 342 }
 343
 344 static void usb_msd_handle_control(USBDevice *dev, USBPacket *p,
 345                int request, int value, int index, int length, uint8_t *data)
 346 {
 347     MSDState *s = (MSDState *)dev;
 348     SCSIDevice *scsi_dev;
 349     int ret, maxlun;
 350
 351     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 352     if (ret >= 0) {
 353         return;
 354     }
 355
 356     switch (request) {
 357     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 358         break;
 359         /* Class specific requests.  */
 360     case ClassInterfaceOutRequest | MassStorageReset:
 361         /* Reset state ready for the next CBW.  */
 362         s->mode = USB_MSDM_CBW;
 363         break;
 364     case ClassInterfaceRequest | GetMaxLun:
 365         maxlun = 0;
 366         for (;;) {
 367             scsi_dev = scsi_device_find(&s->bus, 0, 0, maxlun+1);
 368             if (scsi_dev == NULL) {
 369                 break;
 370             }
 371             if (scsi_dev->lun != maxlun+1) {
 372                 break;
 373             }
 374             maxlun++;
 375         }
 376         DPRINTF("MaxLun %d\n", maxlun);
 377         data[0] = maxlun;
 378         p->actual_length = 1;
 379         break;
 380     default:
 381         p->status = USB_RET_STALL;
 382         break;
 383     }
 384 }
 385
 386 static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p)
 387 {
 388     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 389
 390     assert(s->packet == p);
 391     s->packet = NULL;
 392
 393     if (s->req) {
 394         scsi_req_cancel(s->req);
 395     }
 396 }
 397
 398 static void usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 399 {
 400     MSDState *s = (MSDState *)dev;
 401     uint32_t tag;
 402     struct usb_msd_cbw cbw;
 403     uint8_t devep = p->ep->nr;
 404     SCSIDevice *scsi_dev;
 405     uint32_t len;
 406
 407     switch (p->pid) {
 408     case USB_TOKEN_OUT:
 409         if (devep != 2)
 410             goto fail;
 411
 412         switch (s->mode) {
 413         case USB_MSDM_CBW:
 414             if (p->iov.size != 31) {
 415                 error_report("usb-msd: Bad CBW size");
 416                 goto fail;
 417             }
 418             usb_packet_copy(p, &cbw, 31);
 419             if (le32_to_cpu(cbw.sig) != 0x43425355) {
 420                 error_report("usb-msd: Bad signature %08x",
 421                              le32_to_cpu(cbw.sig));
 422                 goto fail;
 423             }
 424             DPRINTF("Command on LUN %d\n", cbw.lun);
 425             scsi_dev = scsi_device_find(&s->bus, 0, 0, cbw.lun);
 426             if (scsi_dev == NULL) {
 427                 error_report("usb-msd: Bad LUN %d", cbw.lun);
 428                 goto fail;
 429             }
 430             tag = le32_to_cpu(cbw.tag);
 431             s->data_len = le32_to_cpu(cbw.data_len);
 432             if (s->data_len == 0) {
 433                 s->mode = USB_MSDM_CSW;
 434             } else if (cbw.flags & 0x80) {
 435                 s->mode = USB_MSDM_DATAIN;
 436             } else {
 437                 s->mode = USB_MSDM_DATAOUT;
 438             }
 439             DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
 440                     tag, cbw.flags, cbw.cmd_len, s->data_len);
 441             assert(le32_to_cpu(s->csw.residue) == 0);
 442             s->scsi_len = 0;
 443             s->req = scsi_req_new(scsi_dev, tag, cbw.lun, cbw.cmd, NULL);
 444 #ifdef DEBUG_MSD
 445             scsi_req_print(s->req);
 446 #endif
 447             len = scsi_req_enqueue(s->req);
 448             if (len) {
 449                 scsi_req_continue(s->req);
 450             }
 451             break;
 452
 453         case USB_MSDM_DATAOUT:
 454             DPRINTF("Data out %zd/%d\n", p->iov.size, s->data_len);
 455             if (p->iov.size > s->data_len) {
 456                 goto fail;
 457             }
 458
 459             if (s->scsi_len) {
 460                 usb_msd_copy_data(s, p);
 461             }
 462             if (le32_to_cpu(s->csw.residue)) {
 463                 int len = p->iov.size - p->actual_length;
 464                 if (len) {
 465                     usb_packet_skip(p, len);
 466                     s->data_len -= len;
 467                     if (s->data_len == 0) {
 468                         s->mode = USB_MSDM_CSW;
 469                     }
 470                 }
 471             }
 472             if (p->actual_length < p->iov.size) {
 473                 DPRINTF("Deferring packet %p [wait data-out]\n", p);
 474                 s->packet = p;
 475                 p->status = USB_RET_ASYNC;
 476             }
 477             break;
 478
 479         default:
 480             DPRINTF("Unexpected write (len %zd)\n", p->iov.size);
 481             goto fail;
 482         }
 483         break;
 484
 485     case USB_TOKEN_IN:
 486         if (devep != 1)
 487             goto fail;
 488
 489         switch (s->mode) {
 490         case USB_MSDM_DATAOUT:
 491             if (s->data_len != 0 || p->iov.size < 13) {
 492                 goto fail;
 493             }
 494             /* Waiting for SCSI write to complete.  */
 495             s->packet = p;
 496             p->status = USB_RET_ASYNC;
 497             break;
 498
 499         case USB_MSDM_CSW:
 500             if (p->iov.size < 13) {
 501                 goto fail;
 502             }
 503
 504             if (s->req) {
 505                 /* still in flight */
 506                 DPRINTF("Deferring packet %p [wait status]\n", p);
 507                 s->packet = p;
 508                 p->status = USB_RET_ASYNC;
 509             } else {
 510                 usb_msd_send_status(s, p);
 511                 s->mode = USB_MSDM_CBW;
 512             }
 513             break;
 514
 515         case USB_MSDM_DATAIN:
 516             DPRINTF("Data in %zd/%d, scsi_len %d\n",
 517                     p->iov.size, s->data_len, s->scsi_len);
 518             if (s->scsi_len) {
 519                 usb_msd_copy_data(s, p);
 520             }
 521             if (le32_to_cpu(s->csw.residue)) {
 522                 int len = p->iov.size - p->actual_length;
 523                 if (len) {
 524                     usb_packet_skip(p, len);
 525                     s->data_len -= len;
 526                     if (s->data_len == 0) {
 527                         s->mode = USB_MSDM_CSW;
 528                     }
 529                 }
 530             }
 531             if (p->actual_length < p->iov.size) {
 532                 DPRINTF("Deferring packet %p [wait data-in]\n", p);
 533                 s->packet = p;
 534                 p->status = USB_RET_ASYNC;
 535             }
 536             break;
 537
 538         default:
 539             DPRINTF("Unexpected read (len %zd)\n", p->iov.size);
 540             goto fail;
 541         }
 542         break;
 543
 544     default:
 545         DPRINTF("Bad token\n");
 546     fail:
 547         p->status = USB_RET_STALL;
 548         break;
 549     }
 550 }
 551
 552 static void usb_msd_password_cb(void *opaque, int err)
 553 {
 554     MSDState *s = opaque;
 555     Error *local_err = NULL;
 556
 557     if (!err) {
 558         usb_device_attach(&s->dev, &local_err);
 559     }
 560
 561     if (local_err) {
 562         qerror_report_err(local_err);
 563         error_free(local_err);
 564         qdev_unplug(&s->dev.qdev, NULL);
 565     }
 566 }
 567
 568 static void *usb_msd_load_request(QEMUFile *f, SCSIRequest *req)
 569 {
 570     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 571
 572     /* nothing to load, just store req in our state struct */
 573     assert(s->req == NULL);
 574     scsi_req_ref(req);
 575     s->req = req;
 576     return NULL;
 577 }
 578
 579 static const struct SCSIBusInfo usb_msd_scsi_info_storage = {
 580     .tcq = false,
 581     .max_target = 0,
 582     .max_lun = 0,
 583
 584     .transfer_data = usb_msd_transfer_data,
 585     .complete = usb_msd_command_complete,
 586     .cancel = usb_msd_request_cancelled,
 587     .load_request = usb_msd_load_request,
 588 };
 589
 590 static const struct SCSIBusInfo usb_msd_scsi_info_bot = {
 591     .tcq = false,
 592     .max_target = 0,
 593     .max_lun = 15,
 594
 595     .transfer_data = usb_msd_transfer_data,
 596     .complete = usb_msd_command_complete,
 597     .cancel = usb_msd_request_cancelled,
 598     .load_request = usb_msd_load_request,
 599 };
 600
 601 static void usb_msd_realize_storage(USBDevice *dev, Error **errp)
 602 {
 603     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 604     BlockBackend *blk = s->conf.blk;
 605     SCSIDevice *scsi_dev;
 606     Error *err = NULL;
 607
 608     if (!blk) {
 609         error_setg(errp, "drive property not set");
 610         return;
 611     }
 612
 613     blkconf_serial(&s->conf, &dev->serial);
 614
 615     /*
 616      * Hack alert: this pretends to be a block device, but it's really
 617      * a SCSI bus that can serve only a single device, which it
 618      * creates automatically.  But first it needs to detach from its
 619      * blockdev, or else scsi_bus_legacy_add_drive() dies when it
 620      * attaches again.
 621      *
 622      * The hack is probably a bad idea.
 623      */
 624     blk_detach_dev(blk, &s->dev.qdev);
 625     s->conf.blk = NULL;
 626
 627     usb_desc_create_serial(dev);
 628     usb_desc_init(dev);
 629     scsi_bus_new(&s->bus, sizeof(s->bus), DEVICE(dev),
 630                  &usb_msd_scsi_info_storage, NULL);
 631     scsi_dev = scsi_bus_legacy_add_drive(&s->bus, blk, 0, !!s->removable,
 632                                          s->conf.bootindex, dev->serial,
 633                                          &err);
 634     if (!scsi_dev) {
 635         error_propagate(errp, err);
 636         return;
 637     }
 638     usb_msd_handle_reset(dev);
 639     s->scsi_dev = scsi_dev;
 640
 641     if (bdrv_key_required(blk_bs(blk))) {
 642         if (cur_mon) {
 643             monitor_read_bdrv_key_start(cur_mon, blk_bs(blk),
 644                                         usb_msd_password_cb, s);
 645             s->dev.auto_attach = 0;
 646         } else {
 647             autostart = 0;
 648         }
 649     }
 650 }
 651
 652 static void usb_msd_realize_bot(USBDevice *dev, Error **errp)
 653 {
 654     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 655
 656     usb_desc_create_serial(dev);
 657     usb_desc_init(dev);
 658     scsi_bus_new(&s->bus, sizeof(s->bus), DEVICE(dev),
 659                  &usb_msd_scsi_info_bot, NULL);
 660     usb_msd_handle_reset(dev);
 661 }
 662
 663 static USBDevice *usb_msd_init(USBBus *bus, const char *filename)
 664 {
 665     static int nr=0;
 666     char id[8];
 667     QemuOpts *opts;
 668     DriveInfo *dinfo;
 669     USBDevice *dev;
 670     const char *p1;
 671     char fmt[32];
 672
 673     /* parse -usbdevice disk: syntax into drive opts */
 674     do {
 675         snprintf(id, sizeof(id), "usb%d", nr++);
 676         opts = qemu_opts_create(qemu_find_opts("drive"), id, 1, NULL);
 677     } while (!opts);
 678
 679     p1 = strchr(filename, ':');
 680     if (p1++) {
 681         const char *p2;
 682
 683         if (strstart(filename, "format=", &p2)) {
 684             int len = MIN(p1 - p2, sizeof(fmt));
 685             pstrcpy(fmt, len, p2);
 686             qemu_opt_set(opts, "format", fmt);
 687         } else if (*filename != ':') {
 688             error_report("unrecognized USB mass-storage option %s", filename);
 689             return NULL;
 690         }
 691         filename = p1;
 692     }
 693     if (!*filename) {
 694         error_report("block device specification needed");
 695         return NULL;
 696     }
 697     qemu_opt_set(opts, "file", filename);
 698     qemu_opt_set(opts, "if", "none");
 699
 700     /* create host drive */
 701     dinfo = drive_new(opts, 0);
 702     if (!dinfo) {
 703         qemu_opts_del(opts);
 704         return NULL;
 705     }
 706
 707     /* create guest device */
 708     dev = usb_create(bus, "usb-storage");
 709     if (!dev) {
 710         return NULL;
 711     }
 712     if (qdev_prop_set_drive(&dev->qdev, "drive",
 713                             blk_by_legacy_dinfo(dinfo)) < 0) {
 714         object_unparent(OBJECT(dev));
 715         return NULL;
 716     }
 717     if (qdev_init(&dev->qdev) < 0)
 718         return NULL;
 719
 720     return dev;
 721 }
 722
 723 static const VMStateDescription vmstate_usb_msd = {
 724     .name = "usb-storage",
 725     .version_id = 1,
 726     .minimum_version_id = 1,
 727     .fields = (VMStateField[]) {
 728         VMSTATE_USB_DEVICE(dev, MSDState),
 729         VMSTATE_UINT32(mode, MSDState),
 730         VMSTATE_UINT32(scsi_len, MSDState),
 731         VMSTATE_UINT32(scsi_off, MSDState),
 732         VMSTATE_UINT32(data_len, MSDState),
 733         VMSTATE_UINT32(csw.sig, MSDState),
 734         VMSTATE_UINT32(csw.tag, MSDState),
 735         VMSTATE_UINT32(csw.residue, MSDState),
 736         VMSTATE_UINT8(csw.status, MSDState),
 737         VMSTATE_END_OF_LIST()
 738     }
 739 };
 740
 741 static Property msd_properties[] = {
 742     DEFINE_BLOCK_PROPERTIES(MSDState, conf),
 743     DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
 744     DEFINE_PROP_END_OF_LIST(),
 745 };
 746
 747 static void usb_msd_class_initfn_common(ObjectClass *klass)
 748 {
 749     DeviceClass *dc = DEVICE_CLASS(klass);
 750     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 751
 752     uc->product_desc   = "QEMU USB MSD";
 753     uc->usb_desc       = &desc;
 754     uc->cancel_packet  = usb_msd_cancel_io;
 755     uc->handle_attach  = usb_desc_attach;
 756     uc->handle_reset   = usb_msd_handle_reset;
 757     uc->handle_control = usb_msd_handle_control;
 758     uc->handle_data    = usb_msd_handle_data;
 759     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 760     dc->fw_name = "storage";
 761     dc->vmsd = &vmstate_usb_msd;
 762 }
 763
 764 static void usb_msd_class_initfn_storage(ObjectClass *klass, void *data)
 765 {
 766     DeviceClass *dc = DEVICE_CLASS(klass);
 767     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 768
 769     uc->realize = usb_msd_realize_storage;
 770     dc->props = msd_properties;
 771     usb_msd_class_initfn_common(klass);
 772 }
 773
 774 static void usb_msd_get_bootindex(Object *obj, Visitor *v, void *opaque,
 775                                   const char *name, Error **errp)
 776 {
 777     USBDevice *dev = USB_DEVICE(obj);
 778     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 779
 780     visit_type_int32(v, &s->conf.bootindex, name, errp);
 781 }
 782
 783 static void usb_msd_set_bootindex(Object *obj, Visitor *v, void *opaque,
 784                                   const char *name, Error **errp)
 785 {
 786     USBDevice *dev = USB_DEVICE(obj);
 787     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 788     int32_t boot_index;
 789     Error *local_err = NULL;
 790
 791     visit_type_int32(v, &boot_index, name, &local_err);
 792     if (local_err) {
 793         goto out;
 794     }
 795     /* check whether bootindex is present in fw_boot_order list  */
 796     check_boot_index(boot_index, &local_err);
 797     if (local_err) {
 798         goto out;
 799     }
 800     /* change bootindex to a new one */
 801     s->conf.bootindex = boot_index;
 802
 803     if (s->scsi_dev) {
 804         object_property_set_int(OBJECT(s->scsi_dev), boot_index, "bootindex",
 805                                 &error_abort);
 806     }
 807
 808 out:
 809     if (local_err) {
 810         error_propagate(errp, local_err);
 811     }
 812 }
 813
 814 static void usb_msd_instance_init(Object *obj)
 815 {
 816     object_property_add(obj, "bootindex", "int32",
 817                         usb_msd_get_bootindex,
 818                         usb_msd_set_bootindex, NULL, NULL, NULL);
 819     object_property_set_int(obj, -1, "bootindex", NULL);
 820 }
 821
 822 static void usb_msd_class_initfn_bot(ObjectClass *klass, void *data)
 823 {
 824     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 825     DeviceClass *dc = DEVICE_CLASS(klass);
 826
 827     uc->realize = usb_msd_realize_bot;
 828     usb_msd_class_initfn_common(klass);
 829     dc->hotpluggable = false;
 830 }
 831
 832 static const TypeInfo msd_info = {
 833     .name          = "usb-storage",
 834     .parent        = TYPE_USB_DEVICE,
 835     .instance_size = sizeof(MSDState),
 836     .class_init    = usb_msd_class_initfn_storage,
 837     .instance_init = usb_msd_instance_init,
 838 };
 839
 840 static const TypeInfo bot_info = {
 841     .name          = "usb-bot",
 842     .parent        = TYPE_USB_DEVICE,
 843     .instance_size = sizeof(MSDState),
 844     .class_init    = usb_msd_class_initfn_bot,
 845 };
 846
 847 static void usb_msd_register_types(void)
 848 {
 849     type_register_static(&msd_info);
 850     type_register_static(&bot_info);
 851     usb_legacy_register("usb-storage", "disk", usb_msd_init);
 852 }
 853
 854 type_init(usb_msd_register_types)