hw/usb-msd.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.h"
  13 #include "usb.h"
  14 #include "usb-desc.h"
  15 #include "scsi.h"
  16 #include "console.h"
  17 #include "monitor.h"
  18 #include "sysemu.h"
  19 #include "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_len;
  52     uint8_t *scsi_buf;
  53     uint32_t data_len;
  54     uint32_t residue;
  55     struct usb_msd_csw csw;
  56     SCSIRequest *req;
  57     SCSIBus bus;
  58     BlockConf conf;
  59     char *serial;
  60     SCSIDevice *scsi_dev;
  61     uint32_t removable;
  62     /* For async completion.  */
  63     USBPacket *packet;
  64 } MSDState;
  65
  66 struct usb_msd_cbw {
  67     uint32_t sig;
  68     uint32_t tag;
  69     uint32_t data_len;
  70     uint8_t flags;
  71     uint8_t lun;
  72     uint8_t cmd_len;
  73     uint8_t cmd[16];
  74 };
  75
  76 enum {
  77     STR_MANUFACTURER = 1,
  78     STR_PRODUCT,
  79     STR_SERIALNUMBER,
  80     STR_CONFIG_FULL,
  81     STR_CONFIG_HIGH,
  82 };
  83
  84 static const USBDescStrings desc_strings = {
  85     [STR_MANUFACTURER] = "QEMU " QEMU_VERSION,
  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 };
  91
  92 static const USBDescIface desc_iface_full = {
  93     .bInterfaceNumber              = 0,
  94     .bNumEndpoints                 = 2,
  95     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
  96     .bInterfaceSubClass            = 0x06, /* SCSI */
  97     .bInterfaceProtocol            = 0x50, /* Bulk */
  98     .eps = (USBDescEndpoint[]) {
  99         {
 100             .bEndpointAddress      = USB_DIR_IN | 0x01,
 101             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 102             .wMaxPacketSize        = 64,
 103         },{
 104             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 105             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 106             .wMaxPacketSize        = 64,
 107         },
 108     }
 109 };
 110
 111 static const USBDescDevice desc_device_full = {
 112     .bcdUSB                        = 0x0200,
 113     .bMaxPacketSize0               = 8,
 114     .bNumConfigurations            = 1,
 115     .confs = (USBDescConfig[]) {
 116         {
 117             .bNumInterfaces        = 1,
 118             .bConfigurationValue   = 1,
 119             .iConfiguration        = STR_CONFIG_FULL,
 120             .bmAttributes          = 0xc0,
 121             .nif = 1,
 122             .ifs = &desc_iface_full,
 123         },
 124     },
 125 };
 126
 127 static const USBDescIface desc_iface_high = {
 128     .bInterfaceNumber              = 0,
 129     .bNumEndpoints                 = 2,
 130     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 131     .bInterfaceSubClass            = 0x06, /* SCSI */
 132     .bInterfaceProtocol            = 0x50, /* Bulk */
 133     .eps = (USBDescEndpoint[]) {
 134         {
 135             .bEndpointAddress      = USB_DIR_IN | 0x01,
 136             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 137             .wMaxPacketSize        = 512,
 138         },{
 139             .bEndpointAddress      = USB_DIR_OUT | 0x02,
 140             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 141             .wMaxPacketSize        = 512,
 142         },
 143     }
 144 };
 145
 146 static const USBDescDevice desc_device_high = {
 147     .bcdUSB                        = 0x0200,
 148     .bMaxPacketSize0               = 64,
 149     .bNumConfigurations            = 1,
 150     .confs = (USBDescConfig[]) {
 151         {
 152             .bNumInterfaces        = 1,
 153             .bConfigurationValue   = 1,
 154             .iConfiguration        = STR_CONFIG_HIGH,
 155             .bmAttributes          = 0xc0,
 156             .nif = 1,
 157             .ifs = &desc_iface_high,
 158         },
 159     },
 160 };
 161
 162 static const USBDesc desc = {
 163     .id = {
 164         .idVendor          = 0x46f4, /* CRC16() of "QEMU" */
 165         .idProduct         = 0x0001,
 166         .bcdDevice         = 0,
 167         .iManufacturer     = STR_MANUFACTURER,
 168         .iProduct          = STR_PRODUCT,
 169         .iSerialNumber     = STR_SERIALNUMBER,
 170     },
 171     .full = &desc_device_full,
 172     .high = &desc_device_high,
 173     .str  = desc_strings,
 174 };
 175
 176 static void usb_msd_copy_data(MSDState *s, USBPacket *p)
 177 {
 178     uint32_t len;
 179     len = p->iov.size - p->result;
 180     if (len > s->scsi_len)
 181         len = s->scsi_len;
 182     usb_packet_copy(p, s->scsi_buf, len);
 183     s->scsi_len -= len;
 184     s->scsi_buf += len;
 185     s->data_len -= len;
 186     if (s->scsi_len == 0 || s->data_len == 0) {
 187         scsi_req_continue(s->req);
 188     }
 189 }
 190
 191 static void usb_msd_send_status(MSDState *s, USBPacket *p)
 192 {
 193     int len;
 194
 195     DPRINTF("Command status %d tag 0x%x, len %zd\n",
 196             s->csw.status, s->csw.tag, p->iov.size);
 197
 198     assert(s->csw.sig == 0x53425355);
 199     len = MIN(sizeof(s->csw), p->iov.size);
 200     usb_packet_copy(p, &s->csw, len);
 201     memset(&s->csw, 0, sizeof(s->csw));
 202 }
 203
 204 static void usb_msd_transfer_data(SCSIRequest *req, uint32_t len)
 205 {
 206     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 207     USBPacket *p = s->packet;
 208
 209     assert((s->mode == USB_MSDM_DATAOUT) == (req->cmd.mode == SCSI_XFER_TO_DEV));
 210     s->scsi_len = len;
 211     s->scsi_buf = scsi_req_get_buf(req);
 212     if (p) {
 213         usb_msd_copy_data(s, p);
 214         p = s->packet;
 215         if (p && p->result == p->iov.size) {
 216             /* Set s->packet to NULL before calling usb_packet_complete
 217                because another request may be issued before
 218                usb_packet_complete returns.  */
 219             DPRINTF("Packet complete %p\n", p);
 220             s->packet = NULL;
 221             usb_packet_complete(&s->dev, p);
 222         }
 223     }
 224 }
 225
 226 static void usb_msd_command_complete(SCSIRequest *req, uint32_t status)
 227 {
 228     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 229     USBPacket *p = s->packet;
 230
 231     DPRINTF("Command complete %d tag 0x%x\n", status, req->tag);
 232     s->residue = s->data_len;
 233
 234     s->csw.sig = cpu_to_le32(0x53425355);
 235     s->csw.tag = cpu_to_le32(req->tag);
 236     s->csw.residue = s->residue;
 237     s->csw.status = status != 0;
 238
 239     if (s->packet) {
 240         if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
 241             /* A deferred packet with no write data remaining must be
 242                the status read packet.  */
 243             usb_msd_send_status(s, p);
 244             s->mode = USB_MSDM_CBW;
 245         } else {
 246             if (s->data_len) {
 247                 int len = (p->iov.size - p->result);
 248                 usb_packet_skip(p, len);
 249                 s->data_len -= len;
 250             }
 251             if (s->data_len == 0) {
 252                 s->mode = USB_MSDM_CSW;
 253             }
 254         }
 255         s->packet = NULL;
 256         usb_packet_complete(&s->dev, p);
 257     } else if (s->data_len == 0) {
 258         s->mode = USB_MSDM_CSW;
 259     }
 260     scsi_req_unref(req);
 261     s->req = NULL;
 262 }
 263
 264 static void usb_msd_request_cancelled(SCSIRequest *req)
 265 {
 266     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 267
 268     if (req == s->req) {
 269         scsi_req_unref(s->req);
 270         s->req = NULL;
 271         s->packet = NULL;
 272         s->scsi_len = 0;
 273     }
 274 }
 275
 276 static void usb_msd_handle_reset(USBDevice *dev)
 277 {
 278     MSDState *s = (MSDState *)dev;
 279
 280     DPRINTF("Reset\n");
 281     if (s->req) {
 282         scsi_req_cancel(s->req);
 283     }
 284     assert(s->req == NULL);
 285
 286     if (s->packet) {
 287         USBPacket *p = s->packet;
 288         s->packet = NULL;
 289         p->result = USB_RET_STALL;
 290         usb_packet_complete(dev, p);
 291     }
 292
 293     s->mode = USB_MSDM_CBW;
 294 }
 295
 296 static int usb_msd_handle_control(USBDevice *dev, USBPacket *p,
 297                int request, int value, int index, int length, uint8_t *data)
 298 {
 299     MSDState *s = (MSDState *)dev;
 300     int ret;
 301
 302     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 303     if (ret >= 0) {
 304         return ret;
 305     }
 306
 307     ret = 0;
 308     switch (request) {
 309     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 310         ret = 0;
 311         break;
 312         /* Class specific requests.  */
 313     case ClassInterfaceOutRequest | MassStorageReset:
 314         /* Reset state ready for the next CBW.  */
 315         s->mode = USB_MSDM_CBW;
 316         ret = 0;
 317         break;
 318     case ClassInterfaceRequest | GetMaxLun:
 319         data[0] = 0;
 320         ret = 1;
 321         break;
 322     default:
 323         ret = USB_RET_STALL;
 324         break;
 325     }
 326     return ret;
 327 }
 328
 329 static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p)
 330 {
 331     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 332
 333     if (s->req) {
 334         scsi_req_cancel(s->req);
 335     }
 336 }
 337
 338 static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 339 {
 340     MSDState *s = (MSDState *)dev;
 341     uint32_t tag;
 342     int ret = 0;
 343     struct usb_msd_cbw cbw;
 344     uint8_t devep = p->devep;
 345
 346     switch (p->pid) {
 347     case USB_TOKEN_OUT:
 348         if (devep != 2)
 349             goto fail;
 350
 351         switch (s->mode) {
 352         case USB_MSDM_CBW:
 353             if (p->iov.size != 31) {
 354                 fprintf(stderr, "usb-msd: Bad CBW size");
 355                 goto fail;
 356             }
 357             usb_packet_copy(p, &cbw, 31);
 358             if (le32_to_cpu(cbw.sig) != 0x43425355) {
 359                 fprintf(stderr, "usb-msd: Bad signature %08x\n",
 360                         le32_to_cpu(cbw.sig));
 361                 goto fail;
 362             }
 363             DPRINTF("Command on LUN %d\n", cbw.lun);
 364             if (cbw.lun != 0) {
 365                 fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
 366                 goto fail;
 367             }
 368             tag = le32_to_cpu(cbw.tag);
 369             s->data_len = le32_to_cpu(cbw.data_len);
 370             if (s->data_len == 0) {
 371                 s->mode = USB_MSDM_CSW;
 372             } else if (cbw.flags & 0x80) {
 373                 s->mode = USB_MSDM_DATAIN;
 374             } else {
 375                 s->mode = USB_MSDM_DATAOUT;
 376             }
 377             DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
 378                     tag, cbw.flags, cbw.cmd_len, s->data_len);
 379             s->residue = 0;
 380             s->scsi_len = 0;
 381             s->req = scsi_req_new(s->scsi_dev, tag, 0, cbw.cmd, NULL);
 382             scsi_req_enqueue(s->req);
 383             if (s->req && s->req->cmd.xfer != SCSI_XFER_NONE) {
 384                 scsi_req_continue(s->req);
 385             }
 386             ret = p->result;
 387             break;
 388
 389         case USB_MSDM_DATAOUT:
 390             DPRINTF("Data out %zd/%d\n", p->iov.size, s->data_len);
 391             if (p->iov.size > s->data_len) {
 392                 goto fail;
 393             }
 394
 395             if (s->scsi_len) {
 396                 usb_msd_copy_data(s, p);
 397             }
 398             if (s->residue) {
 399                 int len = p->iov.size - p->result;
 400                 if (len) {
 401                     usb_packet_skip(p, len);
 402                     s->data_len -= len;
 403                     if (s->data_len == 0) {
 404                         s->mode = USB_MSDM_CSW;
 405                     }
 406                 }
 407             }
 408             if (p->result < p->iov.size) {
 409                 DPRINTF("Deferring packet %p\n", p);
 410                 s->packet = p;
 411                 ret = USB_RET_ASYNC;
 412             } else {
 413                 ret = p->result;
 414             }
 415             break;
 416
 417         default:
 418             DPRINTF("Unexpected write (len %zd)\n", p->iov.size);
 419             goto fail;
 420         }
 421         break;
 422
 423     case USB_TOKEN_IN:
 424         if (devep != 1)
 425             goto fail;
 426
 427         switch (s->mode) {
 428         case USB_MSDM_DATAOUT:
 429             if (s->data_len != 0 || p->iov.size < 13) {
 430                 goto fail;
 431             }
 432             /* Waiting for SCSI write to complete.  */
 433             s->packet = p;
 434             ret = USB_RET_ASYNC;
 435             break;
 436
 437         case USB_MSDM_CSW:
 438             if (p->iov.size < 13) {
 439                 goto fail;
 440             }
 441
 442             if (s->req) {
 443                 /* still in flight */
 444                 s->packet = p;
 445                 ret = USB_RET_ASYNC;
 446             } else {
 447                 usb_msd_send_status(s, p);
 448                 s->mode = USB_MSDM_CBW;
 449                 ret = 13;
 450             }
 451             break;
 452
 453         case USB_MSDM_DATAIN:
 454             DPRINTF("Data in %zd/%d, scsi_len %d\n",
 455                     p->iov.size, s->data_len, s->scsi_len);
 456             if (s->scsi_len) {
 457                 usb_msd_copy_data(s, p);
 458             }
 459             if (s->residue) {
 460                 int len = p->iov.size - p->result;
 461                 if (len) {
 462                     usb_packet_skip(p, len);
 463                     s->data_len -= len;
 464                     if (s->data_len == 0) {
 465                         s->mode = USB_MSDM_CSW;
 466                     }
 467                 }
 468             }
 469             if (p->result < p->iov.size) {
 470                 DPRINTF("Deferring packet %p\n", p);
 471                 s->packet = p;
 472                 ret = USB_RET_ASYNC;
 473             } else {
 474                 ret = p->result;
 475             }
 476             break;
 477
 478         default:
 479             DPRINTF("Unexpected read (len %zd)\n", p->iov.size);
 480             goto fail;
 481         }
 482         break;
 483
 484     default:
 485         DPRINTF("Bad token\n");
 486     fail:
 487         ret = USB_RET_STALL;
 488         break;
 489     }
 490
 491     return ret;
 492 }
 493
 494 static void usb_msd_password_cb(void *opaque, int err)
 495 {
 496     MSDState *s = opaque;
 497
 498     if (!err)
 499         err = usb_device_attach(&s->dev);
 500
 501     if (err)
 502         qdev_unplug(&s->dev.qdev);
 503 }
 504
 505 static const struct SCSIBusInfo usb_msd_scsi_info = {
 506     .tcq = false,
 507     .max_target = 0,
 508     .max_lun = 0,
 509
 510     .transfer_data = usb_msd_transfer_data,
 511     .complete = usb_msd_command_complete,
 512     .cancel = usb_msd_request_cancelled
 513 };
 514
 515 static int usb_msd_initfn(USBDevice *dev)
 516 {
 517     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 518     BlockDriverState *bs = s->conf.bs;
 519     DriveInfo *dinfo;
 520
 521     if (!bs) {
 522         error_report("drive property not set");
 523         return -1;
 524     }
 525
 526     /*
 527      * Hack alert: this pretends to be a block device, but it's really
 528      * a SCSI bus that can serve only a single device, which it
 529      * creates automatically.  But first it needs to detach from its
 530      * blockdev, or else scsi_bus_legacy_add_drive() dies when it
 531      * attaches again.
 532      *
 533      * The hack is probably a bad idea.
 534      */
 535     bdrv_detach_dev(bs, &s->dev.qdev);
 536     s->conf.bs = NULL;
 537
 538     if (!s->serial) {
 539         /* try to fall back to value set with legacy -drive serial=... */
 540         dinfo = drive_get_by_blockdev(bs);
 541         if (*dinfo->serial) {
 542             s->serial = strdup(dinfo->serial);
 543         }
 544     }
 545     if (s->serial) {
 546         usb_desc_set_string(dev, STR_SERIALNUMBER, s->serial);
 547     }
 548
 549     usb_desc_init(dev);
 550     scsi_bus_new(&s->bus, &s->dev.qdev, &usb_msd_scsi_info);
 551     s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable,
 552                                             s->conf.bootindex);
 553     if (!s->scsi_dev) {
 554         return -1;
 555     }
 556     s->bus.qbus.allow_hotplug = 0;
 557     usb_msd_handle_reset(dev);
 558
 559     if (bdrv_key_required(bs)) {
 560         if (cur_mon) {
 561             monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s);
 562             s->dev.auto_attach = 0;
 563         } else {
 564             autostart = 0;
 565         }
 566     }
 567
 568     return 0;
 569 }
 570
 571 static USBDevice *usb_msd_init(const char *filename)
 572 {
 573     static int nr=0;
 574     char id[8];
 575     QemuOpts *opts;
 576     DriveInfo *dinfo;
 577     USBDevice *dev;
 578     const char *p1;
 579     char fmt[32];
 580
 581     /* parse -usbdevice disk: syntax into drive opts */
 582     snprintf(id, sizeof(id), "usb%d", nr++);
 583     opts = qemu_opts_create(qemu_find_opts("drive"), id, 0);
 584
 585     p1 = strchr(filename, ':');
 586     if (p1++) {
 587         const char *p2;
 588
 589         if (strstart(filename, "format=", &p2)) {
 590             int len = MIN(p1 - p2, sizeof(fmt));
 591             pstrcpy(fmt, len, p2);
 592             qemu_opt_set(opts, "format", fmt);
 593         } else if (*filename != ':') {
 594             printf("unrecognized USB mass-storage option %s\n", filename);
 595             return NULL;
 596         }
 597         filename = p1;
 598     }
 599     if (!*filename) {
 600         printf("block device specification needed\n");
 601         return NULL;
 602     }
 603     qemu_opt_set(opts, "file", filename);
 604     qemu_opt_set(opts, "if", "none");
 605
 606     /* create host drive */
 607     dinfo = drive_init(opts, 0);
 608     if (!dinfo) {
 609         qemu_opts_del(opts);
 610         return NULL;
 611     }
 612
 613     /* create guest device */
 614     dev = usb_create(NULL /* FIXME */, "usb-storage");
 615     if (!dev) {
 616         return NULL;
 617     }
 618     if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 619         qdev_free(&dev->qdev);
 620         return NULL;
 621     }
 622     if (qdev_init(&dev->qdev) < 0)
 623         return NULL;
 624
 625     return dev;
 626 }
 627
 628 static const VMStateDescription vmstate_usb_msd = {
 629     .name = "usb-storage",
 630     .unmigratable = 1, /* FIXME: handle transactions which are in flight */
 631     .version_id = 1,
 632     .minimum_version_id = 1,
 633     .fields = (VMStateField []) {
 634         VMSTATE_USB_DEVICE(dev, MSDState),
 635         VMSTATE_END_OF_LIST()
 636     }
 637 };
 638
 639 static struct USBDeviceInfo msd_info = {
 640     .product_desc   = "QEMU USB MSD",
 641     .qdev.name      = "usb-storage",
 642     .qdev.fw_name      = "storage",
 643     .qdev.size      = sizeof(MSDState),
 644     .qdev.vmsd      = &vmstate_usb_msd,
 645     .usb_desc       = &desc,
 646     .init           = usb_msd_initfn,
 647     .handle_packet  = usb_generic_handle_packet,
 648     .cancel_packet  = usb_msd_cancel_io,
 649     .handle_attach  = usb_desc_attach,
 650     .handle_reset   = usb_msd_handle_reset,
 651     .handle_control = usb_msd_handle_control,
 652     .handle_data    = usb_msd_handle_data,
 653     .usbdevice_name = "disk",
 654     .usbdevice_init = usb_msd_init,
 655     .qdev.props     = (Property[]) {
 656         DEFINE_BLOCK_PROPERTIES(MSDState, conf),
 657         DEFINE_PROP_STRING("serial", MSDState, serial),
 658         DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
 659         DEFINE_PROP_END_OF_LIST(),
 660     },
 661 };
 662
 663 static void usb_msd_register_devices(void)
 664 {
 665     usb_qdev_register(&msd_info);
 666 }
 667 device_init(usb_msd_register_devices)