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 licenced 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, /* Tranfer data to device.  */
  37     USB_MSDM_DATAIN, /* Transfer data from device.  */
  38     USB_MSDM_CSW /* Command Status.  */
  39 };
  40
  41 typedef struct {
  42     USBDevice dev;
  43     enum USBMSDMode mode;
  44     uint32_t scsi_len;
  45     uint8_t *scsi_buf;
  46     uint32_t usb_len;
  47     uint8_t *usb_buf;
  48     uint32_t data_len;
  49     uint32_t residue;
  50     uint32_t tag;
  51     SCSIBus bus;
  52     BlockConf conf;
  53     SCSIDevice *scsi_dev;
  54     uint32_t removable;
  55     int result;
  56     /* For async completion.  */
  57     USBPacket *packet;
  58 } MSDState;
  59
  60 struct usb_msd_cbw {
  61     uint32_t sig;
  62     uint32_t tag;
  63     uint32_t data_len;
  64     uint8_t flags;
  65     uint8_t lun;
  66     uint8_t cmd_len;
  67     uint8_t cmd[16];
  68 };
  69
  70 struct usb_msd_csw {
  71     uint32_t sig;
  72     uint32_t tag;
  73     uint32_t residue;
  74     uint8_t status;
  75 };
  76
  77 enum {
  78     STR_MANUFACTURER = 1,
  79     STR_PRODUCT,
  80     STR_SERIALNUMBER,
  81     STR_CONFIG_FULL,
  82     STR_CONFIG_HIGH,
  83 };
  84
  85 static const USBDescStrings desc_strings = {
  86     [STR_MANUFACTURER] = "QEMU " QEMU_VERSION,
  87     [STR_PRODUCT]      = "QEMU USB HARDDRIVE",
  88     [STR_SERIALNUMBER] = "1",
  89     [STR_CONFIG_FULL]  = "Full speed config (usb 1.1)",
  90     [STR_CONFIG_HIGH]  = "High speed config (usb 2.0)",
  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             .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             .ifs = &desc_iface_high,
 157         },
 158     },
 159 };
 160
 161 static const USBDesc desc = {
 162     .id = {
 163         .idVendor          = 0,
 164         .idProduct         = 0,
 165         .bcdDevice         = 0,
 166         .iManufacturer     = STR_MANUFACTURER,
 167         .iProduct          = STR_PRODUCT,
 168         .iSerialNumber     = STR_SERIALNUMBER,
 169     },
 170     .full = &desc_device_full,
 171     .high = &desc_device_high,
 172     .str  = desc_strings,
 173 };
 174
 175 static void usb_msd_copy_data(MSDState *s)
 176 {
 177     uint32_t len;
 178     len = s->usb_len;
 179     if (len > s->scsi_len)
 180         len = s->scsi_len;
 181     if (s->mode == USB_MSDM_DATAIN) {
 182         memcpy(s->usb_buf, s->scsi_buf, len);
 183     } else {
 184         memcpy(s->scsi_buf, s->usb_buf, len);
 185     }
 186     s->usb_len -= len;
 187     s->scsi_len -= len;
 188     s->usb_buf += len;
 189     s->scsi_buf += len;
 190     s->data_len -= len;
 191     if (s->scsi_len == 0 || s->data_len == 0) {
 192         if (s->mode == USB_MSDM_DATAIN) {
 193             s->scsi_dev->info->read_data(s->scsi_dev, s->tag);
 194         } else if (s->mode == USB_MSDM_DATAOUT) {
 195             s->scsi_dev->info->write_data(s->scsi_dev, s->tag);
 196         }
 197     }
 198 }
 199
 200 static void usb_msd_send_status(MSDState *s, USBPacket *p)
 201 {
 202     struct usb_msd_csw csw;
 203     int len;
 204
 205     csw.sig = cpu_to_le32(0x53425355);
 206     csw.tag = cpu_to_le32(s->tag);
 207     csw.residue = s->residue;
 208     csw.status = s->result;
 209
 210     len = MIN(sizeof(csw), p->len);
 211     memcpy(p->data, &csw, len);
 212 }
 213
 214 static void usb_msd_command_complete(SCSIBus *bus, int reason, uint32_t tag,
 215                                      uint32_t arg)
 216 {
 217     MSDState *s = DO_UPCAST(MSDState, dev.qdev, bus->qbus.parent);
 218     USBPacket *p = s->packet;
 219
 220     if (tag != s->tag) {
 221         fprintf(stderr, "usb-msd: Unexpected SCSI Tag 0x%x\n", tag);
 222     }
 223     if (reason == SCSI_REASON_DONE) {
 224         DPRINTF("Command complete %d\n", arg);
 225         s->residue = s->data_len;
 226         s->result = arg != 0;
 227         if (s->packet) {
 228             if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
 229                 /* A deferred packet with no write data remaining must be
 230                    the status read packet.  */
 231                 usb_msd_send_status(s, p);
 232                 s->mode = USB_MSDM_CBW;
 233             } else {
 234                 if (s->data_len) {
 235                     s->data_len -= s->usb_len;
 236                     if (s->mode == USB_MSDM_DATAIN)
 237                         memset(s->usb_buf, 0, s->usb_len);
 238                     s->usb_len = 0;
 239                 }
 240                 if (s->data_len == 0)
 241                     s->mode = USB_MSDM_CSW;
 242             }
 243             s->packet = NULL;
 244             usb_packet_complete(p);
 245         } else if (s->data_len == 0) {
 246             s->mode = USB_MSDM_CSW;
 247         }
 248         return;
 249     }
 250     s->scsi_len = arg;
 251     s->scsi_buf = s->scsi_dev->info->get_buf(s->scsi_dev, tag);
 252     if (p) {
 253         usb_msd_copy_data(s);
 254         if (s->usb_len == 0) {
 255             /* Set s->packet to NULL before calling usb_packet_complete
 256                because annother request may be issued before
 257                usb_packet_complete returns.  */
 258             DPRINTF("Packet complete %p\n", p);
 259             s->packet = NULL;
 260             usb_packet_complete(p);
 261         }
 262     }
 263 }
 264
 265 static void usb_msd_handle_reset(USBDevice *dev)
 266 {
 267     MSDState *s = (MSDState *)dev;
 268
 269     DPRINTF("Reset\n");
 270     s->mode = USB_MSDM_CBW;
 271 }
 272
 273 static int usb_msd_handle_control(USBDevice *dev, int request, int value,
 274                                   int index, int length, uint8_t *data)
 275 {
 276     MSDState *s = (MSDState *)dev;
 277     int ret;
 278
 279     ret = usb_desc_handle_control(dev, request, value, index, length, data);
 280     if (ret >= 0) {
 281         return ret;
 282     }
 283
 284     ret = 0;
 285     switch (request) {
 286     case DeviceRequest | USB_REQ_GET_INTERFACE:
 287         data[0] = 0;
 288         ret = 1;
 289         break;
 290     case DeviceOutRequest | USB_REQ_SET_INTERFACE:
 291         ret = 0;
 292         break;
 293     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 294         ret = 0;
 295         break;
 296     case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
 297         ret = 0;
 298         break;
 299         /* Class specific requests.  */
 300     case ClassInterfaceOutRequest | MassStorageReset:
 301         /* Reset state ready for the next CBW.  */
 302         s->mode = USB_MSDM_CBW;
 303         ret = 0;
 304         break;
 305     case ClassInterfaceRequest | GetMaxLun:
 306         data[0] = 0;
 307         ret = 1;
 308         break;
 309     default:
 310         ret = USB_RET_STALL;
 311         break;
 312     }
 313     return ret;
 314 }
 315
 316 static void usb_msd_cancel_io(USBPacket *p, void *opaque)
 317 {
 318     MSDState *s = opaque;
 319     s->scsi_dev->info->cancel_io(s->scsi_dev, s->tag);
 320     s->packet = NULL;
 321     s->scsi_len = 0;
 322 }
 323
 324 static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 325 {
 326     MSDState *s = (MSDState *)dev;
 327     int ret = 0;
 328     struct usb_msd_cbw cbw;
 329     uint8_t devep = p->devep;
 330     uint8_t *data = p->data;
 331     int len = p->len;
 332
 333     switch (p->pid) {
 334     case USB_TOKEN_OUT:
 335         if (devep != 2)
 336             goto fail;
 337
 338         switch (s->mode) {
 339         case USB_MSDM_CBW:
 340             if (len != 31) {
 341                 fprintf(stderr, "usb-msd: Bad CBW size");
 342                 goto fail;
 343             }
 344             memcpy(&cbw, data, 31);
 345             if (le32_to_cpu(cbw.sig) != 0x43425355) {
 346                 fprintf(stderr, "usb-msd: Bad signature %08x\n",
 347                         le32_to_cpu(cbw.sig));
 348                 goto fail;
 349             }
 350             DPRINTF("Command on LUN %d\n", cbw.lun);
 351             if (cbw.lun != 0) {
 352                 fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
 353                 goto fail;
 354             }
 355             s->tag = le32_to_cpu(cbw.tag);
 356             s->data_len = le32_to_cpu(cbw.data_len);
 357             if (s->data_len == 0) {
 358                 s->mode = USB_MSDM_CSW;
 359             } else if (cbw.flags & 0x80) {
 360                 s->mode = USB_MSDM_DATAIN;
 361             } else {
 362                 s->mode = USB_MSDM_DATAOUT;
 363             }
 364             DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
 365                     s->tag, cbw.flags, cbw.cmd_len, s->data_len);
 366             s->residue = 0;
 367             s->scsi_dev->info->send_command(s->scsi_dev, s->tag, cbw.cmd, 0);
 368             /* ??? Should check that USB and SCSI data transfer
 369                directions match.  */
 370             if (s->residue == 0) {
 371                 if (s->mode == USB_MSDM_DATAIN) {
 372                     s->scsi_dev->info->read_data(s->scsi_dev, s->tag);
 373                 } else if (s->mode == USB_MSDM_DATAOUT) {
 374                     s->scsi_dev->info->write_data(s->scsi_dev, s->tag);
 375                 }
 376             }
 377             ret = len;
 378             break;
 379
 380         case USB_MSDM_DATAOUT:
 381             DPRINTF("Data out %d/%d\n", len, s->data_len);
 382             if (len > s->data_len)
 383                 goto fail;
 384
 385             s->usb_buf = data;
 386             s->usb_len = len;
 387             if (s->scsi_len) {
 388                 usb_msd_copy_data(s);
 389             }
 390             if (s->residue && s->usb_len) {
 391                 s->data_len -= s->usb_len;
 392                 if (s->data_len == 0)
 393                     s->mode = USB_MSDM_CSW;
 394                 s->usb_len = 0;
 395             }
 396             if (s->usb_len) {
 397                 DPRINTF("Deferring packet %p\n", p);
 398                 usb_defer_packet(p, usb_msd_cancel_io, s);
 399                 s->packet = p;
 400                 ret = USB_RET_ASYNC;
 401             } else {
 402                 ret = len;
 403             }
 404             break;
 405
 406         default:
 407             DPRINTF("Unexpected write (len %d)\n", len);
 408             goto fail;
 409         }
 410         break;
 411
 412     case USB_TOKEN_IN:
 413         if (devep != 1)
 414             goto fail;
 415
 416         switch (s->mode) {
 417         case USB_MSDM_DATAOUT:
 418             if (s->data_len != 0 || len < 13)
 419                 goto fail;
 420             /* Waiting for SCSI write to complete.  */
 421             usb_defer_packet(p, usb_msd_cancel_io, s);
 422             s->packet = p;
 423             ret = USB_RET_ASYNC;
 424             break;
 425
 426         case USB_MSDM_CSW:
 427             DPRINTF("Command status %d tag 0x%x, len %d\n",
 428                     s->result, s->tag, len);
 429             if (len < 13)
 430                 goto fail;
 431
 432             usb_msd_send_status(s, p);
 433             s->mode = USB_MSDM_CBW;
 434             ret = 13;
 435             break;
 436
 437         case USB_MSDM_DATAIN:
 438             DPRINTF("Data in %d/%d, scsi_len %d\n", len, s->data_len, s->scsi_len);
 439             if (len > s->data_len)
 440                 len = s->data_len;
 441             s->usb_buf = data;
 442             s->usb_len = len;
 443             if (s->scsi_len) {
 444                 usb_msd_copy_data(s);
 445             }
 446             if (s->residue && s->usb_len) {
 447                 s->data_len -= s->usb_len;
 448                 memset(s->usb_buf, 0, s->usb_len);
 449                 if (s->data_len == 0)
 450                     s->mode = USB_MSDM_CSW;
 451                 s->usb_len = 0;
 452             }
 453             if (s->usb_len) {
 454                 DPRINTF("Deferring packet %p\n", p);
 455                 usb_defer_packet(p, usb_msd_cancel_io, s);
 456                 s->packet = p;
 457                 ret = USB_RET_ASYNC;
 458             } else {
 459                 ret = len;
 460             }
 461             break;
 462
 463         default:
 464             DPRINTF("Unexpected read (len %d)\n", len);
 465             goto fail;
 466         }
 467         break;
 468
 469     default:
 470         DPRINTF("Bad token\n");
 471     fail:
 472         ret = USB_RET_STALL;
 473         break;
 474     }
 475
 476     return ret;
 477 }
 478
 479 static void usb_msd_password_cb(void *opaque, int err)
 480 {
 481     MSDState *s = opaque;
 482
 483     if (!err)
 484         usb_device_attach(&s->dev);
 485     else
 486         qdev_unplug(&s->dev.qdev);
 487 }
 488
 489 static int usb_msd_initfn(USBDevice *dev)
 490 {
 491     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 492     BlockDriverState *bs = s->conf.bs;
 493     DriveInfo *dinfo;
 494
 495     if (!bs) {
 496         error_report("usb-msd: drive property not set");
 497         return -1;
 498     }
 499
 500     /*
 501      * Hack alert: this pretends to be a block device, but it's really
 502      * a SCSI bus that can serve only a single device, which it
 503      * creates automatically.  But first it needs to detach from its
 504      * blockdev, or else scsi_bus_legacy_add_drive() dies when it
 505      * attaches again.
 506      *
 507      * The hack is probably a bad idea.
 508      */
 509     bdrv_detach(bs, &s->dev.qdev);
 510     s->conf.bs = NULL;
 511
 512     dinfo = drive_get_by_blockdev(bs);
 513     if (dinfo && dinfo->serial) {
 514         usb_desc_set_string(dev, STR_SERIALNUMBER, dinfo->serial);
 515     }
 516
 517     usb_desc_init(dev);
 518     scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, usb_msd_command_complete);
 519     s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable);
 520     if (!s->scsi_dev) {
 521         return -1;
 522     }
 523     s->bus.qbus.allow_hotplug = 0;
 524     usb_msd_handle_reset(dev);
 525
 526     if (bdrv_key_required(bs)) {
 527         if (cur_mon) {
 528             monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s);
 529             s->dev.auto_attach = 0;
 530         } else {
 531             autostart = 0;
 532         }
 533     }
 534
 535     return 0;
 536 }
 537
 538 static USBDevice *usb_msd_init(const char *filename)
 539 {
 540     static int nr=0;
 541     char id[8];
 542     QemuOpts *opts;
 543     DriveInfo *dinfo;
 544     USBDevice *dev;
 545     int fatal_error;
 546     const char *p1;
 547     char fmt[32];
 548
 549     /* parse -usbdevice disk: syntax into drive opts */
 550     snprintf(id, sizeof(id), "usb%d", nr++);
 551     opts = qemu_opts_create(qemu_find_opts("drive"), id, 0);
 552
 553     p1 = strchr(filename, ':');
 554     if (p1++) {
 555         const char *p2;
 556
 557         if (strstart(filename, "format=", &p2)) {
 558             int len = MIN(p1 - p2, sizeof(fmt));
 559             pstrcpy(fmt, len, p2);
 560             qemu_opt_set(opts, "format", fmt);
 561         } else if (*filename != ':') {
 562             printf("unrecognized USB mass-storage option %s\n", filename);
 563             return NULL;
 564         }
 565         filename = p1;
 566     }
 567     if (!*filename) {
 568         printf("block device specification needed\n");
 569         return NULL;
 570     }
 571     qemu_opt_set(opts, "file", filename);
 572     qemu_opt_set(opts, "if", "none");
 573
 574     /* create host drive */
 575     dinfo = drive_init(opts, 0, &fatal_error);
 576     if (!dinfo) {
 577         qemu_opts_del(opts);
 578         return NULL;
 579     }
 580
 581     /* create guest device */
 582     dev = usb_create(NULL /* FIXME */, "usb-storage");
 583     if (!dev) {
 584         return NULL;
 585     }
 586     if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 587         qdev_free(&dev->qdev);
 588         return NULL;
 589     }
 590     if (qdev_init(&dev->qdev) < 0)
 591         return NULL;
 592
 593     return dev;
 594 }
 595
 596 static struct USBDeviceInfo msd_info = {
 597     .product_desc   = "QEMU USB MSD",
 598     .qdev.name      = "usb-storage",
 599     .qdev.size      = sizeof(MSDState),
 600     .usb_desc       = &desc,
 601     .init           = usb_msd_initfn,
 602     .handle_packet  = usb_generic_handle_packet,
 603     .handle_attach  = usb_desc_attach,
 604     .handle_reset   = usb_msd_handle_reset,
 605     .handle_control = usb_msd_handle_control,
 606     .handle_data    = usb_msd_handle_data,
 607     .usbdevice_name = "disk",
 608     .usbdevice_init = usb_msd_init,
 609     .qdev.props     = (Property[]) {
 610         DEFINE_BLOCK_PROPERTIES(MSDState, conf),
 611         DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
 612         DEFINE_PROP_END_OF_LIST(),
 613     },
 614 };
 615
 616 static void usb_msd_register_devices(void)
 617 {
 618     usb_qdev_register(&msd_info);
 619 }
 620 device_init(usb_msd_register_devices)