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, /* Transfer 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     SCSIRequest *req;
  52     SCSIBus bus;
  53     BlockConf conf;
  54     char *serial;
  55     SCSIDevice *scsi_dev;
  56     uint32_t removable;
  57     int result;
  58     /* For async completion.  */
  59     USBPacket *packet;
  60 } MSDState;
  61
  62 struct usb_msd_cbw {
  63     uint32_t sig;
  64     uint32_t tag;
  65     uint32_t data_len;
  66     uint8_t flags;
  67     uint8_t lun;
  68     uint8_t cmd_len;
  69     uint8_t cmd[16];
  70 };
  71
  72 struct usb_msd_csw {
  73     uint32_t sig;
  74     uint32_t tag;
  75     uint32_t residue;
  76     uint8_t status;
  77 };
  78
  79 enum {
  80     STR_MANUFACTURER = 1,
  81     STR_PRODUCT,
  82     STR_SERIALNUMBER,
  83     STR_CONFIG_FULL,
  84     STR_CONFIG_HIGH,
  85 };
  86
  87 static const USBDescStrings desc_strings = {
  88     [STR_MANUFACTURER] = "QEMU " QEMU_VERSION,
  89     [STR_PRODUCT]      = "QEMU USB HARDDRIVE",
  90     [STR_SERIALNUMBER] = "1",
  91     [STR_CONFIG_FULL]  = "Full speed config (usb 1.1)",
  92     [STR_CONFIG_HIGH]  = "High speed config (usb 2.0)",
  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          = 0xc0,
 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          = 0xc0,
 159             .nif = 1,
 160             .ifs = &desc_iface_high,
 161         },
 162     },
 163 };
 164
 165 static const USBDesc desc = {
 166     .id = {
 167         .idVendor          = 0,
 168         .idProduct         = 0,
 169         .bcdDevice         = 0,
 170         .iManufacturer     = STR_MANUFACTURER,
 171         .iProduct          = STR_PRODUCT,
 172         .iSerialNumber     = STR_SERIALNUMBER,
 173     },
 174     .full = &desc_device_full,
 175     .high = &desc_device_high,
 176     .str  = desc_strings,
 177 };
 178
 179 static void usb_msd_copy_data(MSDState *s)
 180 {
 181     uint32_t len;
 182     len = s->usb_len;
 183     if (len > s->scsi_len)
 184         len = s->scsi_len;
 185     if (s->mode == USB_MSDM_DATAIN) {
 186         memcpy(s->usb_buf, s->scsi_buf, len);
 187     } else {
 188         memcpy(s->scsi_buf, s->usb_buf, len);
 189     }
 190     s->usb_len -= len;
 191     s->scsi_len -= len;
 192     s->usb_buf += len;
 193     s->scsi_buf += len;
 194     s->data_len -= len;
 195     if (s->scsi_len == 0 || s->data_len == 0) {
 196         scsi_req_continue(s->req);
 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_transfer_data(SCSIRequest *req, uint32_t len)
 215 {
 216     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 217     USBPacket *p = s->packet;
 218
 219     assert((s->mode == USB_MSDM_DATAOUT) == (req->cmd.mode == SCSI_XFER_TO_DEV));
 220     s->scsi_len = len;
 221     s->scsi_buf = scsi_req_get_buf(req);
 222     if (p) {
 223         usb_msd_copy_data(s);
 224         if (s->packet && s->usb_len == 0) {
 225             /* Set s->packet to NULL before calling usb_packet_complete
 226                because another request may be issued before
 227                usb_packet_complete returns.  */
 228             DPRINTF("Packet complete %p\n", p);
 229             s->packet = NULL;
 230             usb_packet_complete(&s->dev, p);
 231         }
 232     }
 233 }
 234
 235 static void usb_msd_command_complete(SCSIRequest *req, uint32_t status)
 236 {
 237     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 238     USBPacket *p = s->packet;
 239
 240     DPRINTF("Command complete %d\n", status);
 241     s->residue = s->data_len;
 242     s->result = status != 0;
 243     if (s->packet) {
 244         if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
 245             /* A deferred packet with no write data remaining must be
 246                the status read packet.  */
 247             usb_msd_send_status(s, p);
 248             s->mode = USB_MSDM_CBW;
 249         } else {
 250             if (s->data_len) {
 251                 s->data_len -= s->usb_len;
 252                 if (s->mode == USB_MSDM_DATAIN) {
 253                     memset(s->usb_buf, 0, s->usb_len);
 254                 }
 255                 s->usb_len = 0;
 256             }
 257             if (s->data_len == 0) {
 258                 s->mode = USB_MSDM_CSW;
 259             }
 260         }
 261         s->packet = NULL;
 262         usb_packet_complete(&s->dev, p);
 263     } else if (s->data_len == 0) {
 264         s->mode = USB_MSDM_CSW;
 265     }
 266     scsi_req_unref(req);
 267     s->req = NULL;
 268 }
 269
 270 static void usb_msd_request_cancelled(SCSIRequest *req)
 271 {
 272     MSDState *s = DO_UPCAST(MSDState, dev.qdev, req->bus->qbus.parent);
 273
 274     if (req == s->req) {
 275         scsi_req_unref(s->req);
 276         s->req = NULL;
 277         s->packet = NULL;
 278         s->scsi_len = 0;
 279     }
 280 }
 281
 282 static void usb_msd_handle_reset(USBDevice *dev)
 283 {
 284     MSDState *s = (MSDState *)dev;
 285
 286     DPRINTF("Reset\n");
 287     s->mode = USB_MSDM_CBW;
 288 }
 289
 290 static int usb_msd_handle_control(USBDevice *dev, USBPacket *p,
 291                int request, int value, int index, int length, uint8_t *data)
 292 {
 293     MSDState *s = (MSDState *)dev;
 294     int ret;
 295
 296     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 297     if (ret >= 0) {
 298         return ret;
 299     }
 300
 301     ret = 0;
 302     switch (request) {
 303     case DeviceRequest | USB_REQ_GET_INTERFACE:
 304         data[0] = 0;
 305         ret = 1;
 306         break;
 307     case DeviceOutRequest | USB_REQ_SET_INTERFACE:
 308         ret = 0;
 309         break;
 310     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 311         ret = 0;
 312         break;
 313     case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
 314         ret = 0;
 315         break;
 316         /* Class specific requests.  */
 317     case ClassInterfaceOutRequest | MassStorageReset:
 318         /* Reset state ready for the next CBW.  */
 319         s->mode = USB_MSDM_CBW;
 320         ret = 0;
 321         break;
 322     case ClassInterfaceRequest | GetMaxLun:
 323         data[0] = 0;
 324         ret = 1;
 325         break;
 326     default:
 327         ret = USB_RET_STALL;
 328         break;
 329     }
 330     return ret;
 331 }
 332
 333 static void usb_msd_cancel_io(USBDevice *dev, USBPacket *p)
 334 {
 335     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 336     scsi_req_cancel(s->req);
 337 }
 338
 339 static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 340 {
 341     MSDState *s = (MSDState *)dev;
 342     int ret = 0;
 343     struct usb_msd_cbw cbw;
 344     uint8_t devep = p->devep;
 345     uint8_t *data = p->data;
 346     int len = p->len;
 347
 348     switch (p->pid) {
 349     case USB_TOKEN_OUT:
 350         if (devep != 2)
 351             goto fail;
 352
 353         switch (s->mode) {
 354         case USB_MSDM_CBW:
 355             if (len != 31) {
 356                 fprintf(stderr, "usb-msd: Bad CBW size");
 357                 goto fail;
 358             }
 359             memcpy(&cbw, data, 31);
 360             if (le32_to_cpu(cbw.sig) != 0x43425355) {
 361                 fprintf(stderr, "usb-msd: Bad signature %08x\n",
 362                         le32_to_cpu(cbw.sig));
 363                 goto fail;
 364             }
 365             DPRINTF("Command on LUN %d\n", cbw.lun);
 366             if (cbw.lun != 0) {
 367                 fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
 368                 goto fail;
 369             }
 370             s->tag = le32_to_cpu(cbw.tag);
 371             s->data_len = le32_to_cpu(cbw.data_len);
 372             if (s->data_len == 0) {
 373                 s->mode = USB_MSDM_CSW;
 374             } else if (cbw.flags & 0x80) {
 375                 s->mode = USB_MSDM_DATAIN;
 376             } else {
 377                 s->mode = USB_MSDM_DATAOUT;
 378             }
 379             DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
 380                     s->tag, cbw.flags, cbw.cmd_len, s->data_len);
 381             s->residue = 0;
 382             s->scsi_len = 0;
 383             s->req = scsi_req_new(s->scsi_dev, s->tag, 0, NULL);
 384             scsi_req_enqueue(s->req, cbw.cmd);
 385             /* ??? Should check that USB and SCSI data transfer
 386                directions match.  */
 387             if (s->mode != USB_MSDM_CSW && s->residue == 0) {
 388                 scsi_req_continue(s->req);
 389             }
 390             ret = len;
 391             break;
 392
 393         case USB_MSDM_DATAOUT:
 394             DPRINTF("Data out %d/%d\n", len, s->data_len);
 395             if (len > s->data_len)
 396                 goto fail;
 397
 398             s->usb_buf = data;
 399             s->usb_len = len;
 400             if (s->scsi_len) {
 401                 usb_msd_copy_data(s);
 402             }
 403             if (s->residue && s->usb_len) {
 404                 s->data_len -= s->usb_len;
 405                 if (s->data_len == 0)
 406                     s->mode = USB_MSDM_CSW;
 407                 s->usb_len = 0;
 408             }
 409             if (s->usb_len) {
 410                 DPRINTF("Deferring packet %p\n", p);
 411                 s->packet = p;
 412                 ret = USB_RET_ASYNC;
 413             } else {
 414                 ret = len;
 415             }
 416             break;
 417
 418         default:
 419             DPRINTF("Unexpected write (len %d)\n", len);
 420             goto fail;
 421         }
 422         break;
 423
 424     case USB_TOKEN_IN:
 425         if (devep != 1)
 426             goto fail;
 427
 428         switch (s->mode) {
 429         case USB_MSDM_DATAOUT:
 430             if (s->data_len != 0 || len < 13)
 431                 goto fail;
 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             DPRINTF("Command status %d tag 0x%x, len %d\n",
 439                     s->result, s->tag, len);
 440             if (len < 13)
 441                 goto fail;
 442
 443             usb_msd_send_status(s, p);
 444             s->mode = USB_MSDM_CBW;
 445             ret = 13;
 446             break;
 447
 448         case USB_MSDM_DATAIN:
 449             DPRINTF("Data in %d/%d, scsi_len %d\n", len, s->data_len, s->scsi_len);
 450             if (len > s->data_len)
 451                 len = s->data_len;
 452             s->usb_buf = data;
 453             s->usb_len = len;
 454             if (s->scsi_len) {
 455                 usb_msd_copy_data(s);
 456             }
 457             if (s->residue && s->usb_len) {
 458                 s->data_len -= s->usb_len;
 459                 memset(s->usb_buf, 0, s->usb_len);
 460                 if (s->data_len == 0)
 461                     s->mode = USB_MSDM_CSW;
 462                 s->usb_len = 0;
 463             }
 464             if (s->usb_len) {
 465                 DPRINTF("Deferring packet %p\n", p);
 466                 s->packet = p;
 467                 ret = USB_RET_ASYNC;
 468             } else {
 469                 ret = len;
 470             }
 471             break;
 472
 473         default:
 474             DPRINTF("Unexpected read (len %d)\n", len);
 475             goto fail;
 476         }
 477         break;
 478
 479     default:
 480         DPRINTF("Bad token\n");
 481     fail:
 482         ret = USB_RET_STALL;
 483         break;
 484     }
 485
 486     return ret;
 487 }
 488
 489 static void usb_msd_password_cb(void *opaque, int err)
 490 {
 491     MSDState *s = opaque;
 492
 493     if (!err)
 494         err = usb_device_attach(&s->dev);
 495
 496     if (err)
 497         qdev_unplug(&s->dev.qdev);
 498 }
 499
 500 static const struct SCSIBusOps usb_msd_scsi_ops = {
 501     .transfer_data = usb_msd_transfer_data,
 502     .complete = usb_msd_command_complete,
 503     .cancel = usb_msd_request_cancelled
 504 };
 505
 506 static int usb_msd_initfn(USBDevice *dev)
 507 {
 508     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 509     BlockDriverState *bs = s->conf.bs;
 510     DriveInfo *dinfo;
 511
 512     if (!bs) {
 513         error_report("usb-msd: drive property not set");
 514         return -1;
 515     }
 516
 517     /*
 518      * Hack alert: this pretends to be a block device, but it's really
 519      * a SCSI bus that can serve only a single device, which it
 520      * creates automatically.  But first it needs to detach from its
 521      * blockdev, or else scsi_bus_legacy_add_drive() dies when it
 522      * attaches again.
 523      *
 524      * The hack is probably a bad idea.
 525      */
 526     bdrv_detach(bs, &s->dev.qdev);
 527     s->conf.bs = NULL;
 528
 529     if (!s->serial) {
 530         /* try to fall back to value set with legacy -drive serial=... */
 531         dinfo = drive_get_by_blockdev(bs);
 532         if (*dinfo->serial) {
 533             s->serial = strdup(dinfo->serial);
 534         }
 535     }
 536     if (s->serial) {
 537         usb_desc_set_string(dev, STR_SERIALNUMBER, s->serial);
 538     }
 539
 540     usb_desc_init(dev);
 541     scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, &usb_msd_scsi_ops);
 542     s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable);
 543     if (!s->scsi_dev) {
 544         return -1;
 545     }
 546     s->bus.qbus.allow_hotplug = 0;
 547     usb_msd_handle_reset(dev);
 548
 549     if (bdrv_key_required(bs)) {
 550         if (cur_mon) {
 551             monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s);
 552             s->dev.auto_attach = 0;
 553         } else {
 554             autostart = 0;
 555         }
 556     }
 557
 558     add_boot_device_path(s->conf.bootindex, &dev->qdev, "/disk@0,0");
 559     return 0;
 560 }
 561
 562 static USBDevice *usb_msd_init(const char *filename)
 563 {
 564     static int nr=0;
 565     char id[8];
 566     QemuOpts *opts;
 567     DriveInfo *dinfo;
 568     USBDevice *dev;
 569     const char *p1;
 570     char fmt[32];
 571
 572     /* parse -usbdevice disk: syntax into drive opts */
 573     snprintf(id, sizeof(id), "usb%d", nr++);
 574     opts = qemu_opts_create(qemu_find_opts("drive"), id, 0);
 575
 576     p1 = strchr(filename, ':');
 577     if (p1++) {
 578         const char *p2;
 579
 580         if (strstart(filename, "format=", &p2)) {
 581             int len = MIN(p1 - p2, sizeof(fmt));
 582             pstrcpy(fmt, len, p2);
 583             qemu_opt_set(opts, "format", fmt);
 584         } else if (*filename != ':') {
 585             printf("unrecognized USB mass-storage option %s\n", filename);
 586             return NULL;
 587         }
 588         filename = p1;
 589     }
 590     if (!*filename) {
 591         printf("block device specification needed\n");
 592         return NULL;
 593     }
 594     qemu_opt_set(opts, "file", filename);
 595     qemu_opt_set(opts, "if", "none");
 596
 597     /* create host drive */
 598     dinfo = drive_init(opts, 0);
 599     if (!dinfo) {
 600         qemu_opts_del(opts);
 601         return NULL;
 602     }
 603
 604     /* create guest device */
 605     dev = usb_create(NULL /* FIXME */, "usb-storage");
 606     if (!dev) {
 607         return NULL;
 608     }
 609     if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 610         qdev_free(&dev->qdev);
 611         return NULL;
 612     }
 613     if (qdev_init(&dev->qdev) < 0)
 614         return NULL;
 615
 616     return dev;
 617 }
 618
 619 static struct USBDeviceInfo msd_info = {
 620     .product_desc   = "QEMU USB MSD",
 621     .qdev.name      = "usb-storage",
 622     .qdev.fw_name      = "storage",
 623     .qdev.size      = sizeof(MSDState),
 624     .usb_desc       = &desc,
 625     .init           = usb_msd_initfn,
 626     .handle_packet  = usb_generic_handle_packet,
 627     .cancel_packet  = usb_msd_cancel_io,
 628     .handle_attach  = usb_desc_attach,
 629     .handle_reset   = usb_msd_handle_reset,
 630     .handle_control = usb_msd_handle_control,
 631     .handle_data    = usb_msd_handle_data,
 632     .usbdevice_name = "disk",
 633     .usbdevice_init = usb_msd_init,
 634     .qdev.props     = (Property[]) {
 635         DEFINE_BLOCK_PROPERTIES(MSDState, conf),
 636         DEFINE_PROP_STRING("serial", MSDState, serial),
 637         DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
 638         DEFINE_PROP_END_OF_LIST(),
 639     },
 640 };
 641
 642 static void usb_msd_register_devices(void)
 643 {
 644     usb_qdev_register(&msd_info);
 645 }
 646 device_init(usb_msd_register_devices)