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     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             .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 USBDesc desc = {
 164     .id = {
 165         .idVendor          = 0,
 166         .idProduct         = 0,
 167         .bcdDevice         = 0,
 168         .iManufacturer     = STR_MANUFACTURER,
 169         .iProduct          = STR_PRODUCT,
 170         .iSerialNumber     = STR_SERIALNUMBER,
 171     },
 172     .full = &desc_device_full,
 173     .high = &desc_device_high,
 174     .str  = desc_strings,
 175 };
 176
 177 static void usb_msd_copy_data(MSDState *s)
 178 {
 179     uint32_t len;
 180     len = s->usb_len;
 181     if (len > s->scsi_len)
 182         len = s->scsi_len;
 183     if (s->mode == USB_MSDM_DATAIN) {
 184         memcpy(s->usb_buf, s->scsi_buf, len);
 185     } else {
 186         memcpy(s->scsi_buf, s->usb_buf, len);
 187     }
 188     s->usb_len -= len;
 189     s->scsi_len -= len;
 190     s->usb_buf += len;
 191     s->scsi_buf += len;
 192     s->data_len -= len;
 193     if (s->scsi_len == 0 || s->data_len == 0) {
 194         if (s->mode == USB_MSDM_DATAIN) {
 195             s->scsi_dev->info->read_data(s->scsi_dev, s->tag);
 196         } else if (s->mode == USB_MSDM_DATAOUT) {
 197             s->scsi_dev->info->write_data(s->scsi_dev, s->tag);
 198         }
 199     }
 200 }
 201
 202 static void usb_msd_send_status(MSDState *s, USBPacket *p)
 203 {
 204     struct usb_msd_csw csw;
 205     int len;
 206
 207     csw.sig = cpu_to_le32(0x53425355);
 208     csw.tag = cpu_to_le32(s->tag);
 209     csw.residue = s->residue;
 210     csw.status = s->result;
 211
 212     len = MIN(sizeof(csw), p->len);
 213     memcpy(p->data, &csw, len);
 214 }
 215
 216 static void usb_msd_command_complete(SCSIBus *bus, int reason, uint32_t tag,
 217                                      uint32_t arg)
 218 {
 219     MSDState *s = DO_UPCAST(MSDState, dev.qdev, bus->qbus.parent);
 220     USBPacket *p = s->packet;
 221
 222     if (tag != s->tag) {
 223         fprintf(stderr, "usb-msd: Unexpected SCSI Tag 0x%x\n", tag);
 224     }
 225     if (reason == SCSI_REASON_DONE) {
 226         DPRINTF("Command complete %d\n", arg);
 227         s->residue = s->data_len;
 228         s->result = arg != 0;
 229         if (s->packet) {
 230             if (s->data_len == 0 && s->mode == USB_MSDM_DATAOUT) {
 231                 /* A deferred packet with no write data remaining must be
 232                    the status read packet.  */
 233                 usb_msd_send_status(s, p);
 234                 s->mode = USB_MSDM_CBW;
 235             } else {
 236                 if (s->data_len) {
 237                     s->data_len -= s->usb_len;
 238                     if (s->mode == USB_MSDM_DATAIN)
 239                         memset(s->usb_buf, 0, s->usb_len);
 240                     s->usb_len = 0;
 241                 }
 242                 if (s->data_len == 0)
 243                     s->mode = USB_MSDM_CSW;
 244             }
 245             s->packet = NULL;
 246             usb_packet_complete(&s->dev, p);
 247         } else if (s->data_len == 0) {
 248             s->mode = USB_MSDM_CSW;
 249         }
 250         return;
 251     }
 252     s->scsi_len = arg;
 253     s->scsi_buf = s->scsi_dev->info->get_buf(s->scsi_dev, tag);
 254     if (p) {
 255         usb_msd_copy_data(s);
 256         if (s->packet && s->usb_len == 0) {
 257             /* Set s->packet to NULL before calling usb_packet_complete
 258                because another request may be issued before
 259                usb_packet_complete returns.  */
 260             DPRINTF("Packet complete %p\n", p);
 261             s->packet = NULL;
 262             usb_packet_complete(&s->dev, p);
 263         }
 264     }
 265 }
 266
 267 static void usb_msd_handle_reset(USBDevice *dev)
 268 {
 269     MSDState *s = (MSDState *)dev;
 270
 271     DPRINTF("Reset\n");
 272     s->mode = USB_MSDM_CBW;
 273 }
 274
 275 static int usb_msd_handle_control(USBDevice *dev, USBPacket *p,
 276                int request, int value, int index, int length, uint8_t *data)
 277 {
 278     MSDState *s = (MSDState *)dev;
 279     int ret;
 280
 281     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 282     if (ret >= 0) {
 283         return ret;
 284     }
 285
 286     ret = 0;
 287     switch (request) {
 288     case DeviceRequest | USB_REQ_GET_INTERFACE:
 289         data[0] = 0;
 290         ret = 1;
 291         break;
 292     case DeviceOutRequest | USB_REQ_SET_INTERFACE:
 293         ret = 0;
 294         break;
 295     case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
 296         ret = 0;
 297         break;
 298     case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
 299         ret = 0;
 300         break;
 301         /* Class specific requests.  */
 302     case ClassInterfaceOutRequest | MassStorageReset:
 303         /* Reset state ready for the next CBW.  */
 304         s->mode = USB_MSDM_CBW;
 305         ret = 0;
 306         break;
 307     case ClassInterfaceRequest | GetMaxLun:
 308         data[0] = 0;
 309         ret = 1;
 310         break;
 311     default:
 312         ret = USB_RET_STALL;
 313         break;
 314     }
 315     return ret;
 316 }
 317
 318 static void usb_msd_cancel_io(USBPacket *p, void *opaque)
 319 {
 320     MSDState *s = opaque;
 321     s->scsi_dev->info->cancel_io(s->scsi_dev, s->tag);
 322     s->packet = NULL;
 323     s->scsi_len = 0;
 324 }
 325
 326 static int usb_msd_handle_data(USBDevice *dev, USBPacket *p)
 327 {
 328     MSDState *s = (MSDState *)dev;
 329     int ret = 0;
 330     struct usb_msd_cbw cbw;
 331     uint8_t devep = p->devep;
 332     uint8_t *data = p->data;
 333     int len = p->len;
 334
 335     switch (p->pid) {
 336     case USB_TOKEN_OUT:
 337         if (devep != 2)
 338             goto fail;
 339
 340         switch (s->mode) {
 341         case USB_MSDM_CBW:
 342             if (len != 31) {
 343                 fprintf(stderr, "usb-msd: Bad CBW size");
 344                 goto fail;
 345             }
 346             memcpy(&cbw, data, 31);
 347             if (le32_to_cpu(cbw.sig) != 0x43425355) {
 348                 fprintf(stderr, "usb-msd: Bad signature %08x\n",
 349                         le32_to_cpu(cbw.sig));
 350                 goto fail;
 351             }
 352             DPRINTF("Command on LUN %d\n", cbw.lun);
 353             if (cbw.lun != 0) {
 354                 fprintf(stderr, "usb-msd: Bad LUN %d\n", cbw.lun);
 355                 goto fail;
 356             }
 357             s->tag = le32_to_cpu(cbw.tag);
 358             s->data_len = le32_to_cpu(cbw.data_len);
 359             if (s->data_len == 0) {
 360                 s->mode = USB_MSDM_CSW;
 361             } else if (cbw.flags & 0x80) {
 362                 s->mode = USB_MSDM_DATAIN;
 363             } else {
 364                 s->mode = USB_MSDM_DATAOUT;
 365             }
 366             DPRINTF("Command tag 0x%x flags %08x len %d data %d\n",
 367                     s->tag, cbw.flags, cbw.cmd_len, s->data_len);
 368             s->residue = 0;
 369             s->scsi_len = 0;
 370             s->scsi_dev->info->send_command(s->scsi_dev, s->tag, cbw.cmd, 0);
 371             /* ??? Should check that USB and SCSI data transfer
 372                directions match.  */
 373             if (s->residue == 0) {
 374                 if (s->mode == USB_MSDM_DATAIN) {
 375                     s->scsi_dev->info->read_data(s->scsi_dev, s->tag);
 376                 } else if (s->mode == USB_MSDM_DATAOUT) {
 377                     s->scsi_dev->info->write_data(s->scsi_dev, s->tag);
 378                 }
 379             }
 380             ret = len;
 381             break;
 382
 383         case USB_MSDM_DATAOUT:
 384             DPRINTF("Data out %d/%d\n", len, s->data_len);
 385             if (len > s->data_len)
 386                 goto fail;
 387
 388             s->usb_buf = data;
 389             s->usb_len = len;
 390             if (s->scsi_len) {
 391                 usb_msd_copy_data(s);
 392             }
 393             if (s->residue && s->usb_len) {
 394                 s->data_len -= s->usb_len;
 395                 if (s->data_len == 0)
 396                     s->mode = USB_MSDM_CSW;
 397                 s->usb_len = 0;
 398             }
 399             if (s->usb_len) {
 400                 DPRINTF("Deferring packet %p\n", p);
 401                 usb_defer_packet(p, usb_msd_cancel_io, s);
 402                 s->packet = p;
 403                 ret = USB_RET_ASYNC;
 404             } else {
 405                 ret = len;
 406             }
 407             break;
 408
 409         default:
 410             DPRINTF("Unexpected write (len %d)\n", len);
 411             goto fail;
 412         }
 413         break;
 414
 415     case USB_TOKEN_IN:
 416         if (devep != 1)
 417             goto fail;
 418
 419         switch (s->mode) {
 420         case USB_MSDM_DATAOUT:
 421             if (s->data_len != 0 || len < 13)
 422                 goto fail;
 423             /* Waiting for SCSI write to complete.  */
 424             usb_defer_packet(p, usb_msd_cancel_io, s);
 425             s->packet = p;
 426             ret = USB_RET_ASYNC;
 427             break;
 428
 429         case USB_MSDM_CSW:
 430             DPRINTF("Command status %d tag 0x%x, len %d\n",
 431                     s->result, s->tag, len);
 432             if (len < 13)
 433                 goto fail;
 434
 435             usb_msd_send_status(s, p);
 436             s->mode = USB_MSDM_CBW;
 437             ret = 13;
 438             break;
 439
 440         case USB_MSDM_DATAIN:
 441             DPRINTF("Data in %d/%d, scsi_len %d\n", len, s->data_len, s->scsi_len);
 442             if (len > s->data_len)
 443                 len = s->data_len;
 444             s->usb_buf = data;
 445             s->usb_len = len;
 446             if (s->scsi_len) {
 447                 usb_msd_copy_data(s);
 448             }
 449             if (s->residue && s->usb_len) {
 450                 s->data_len -= s->usb_len;
 451                 memset(s->usb_buf, 0, s->usb_len);
 452                 if (s->data_len == 0)
 453                     s->mode = USB_MSDM_CSW;
 454                 s->usb_len = 0;
 455             }
 456             if (s->usb_len) {
 457                 DPRINTF("Deferring packet %p\n", p);
 458                 usb_defer_packet(p, usb_msd_cancel_io, s);
 459                 s->packet = p;
 460                 ret = USB_RET_ASYNC;
 461             } else {
 462                 ret = len;
 463             }
 464             break;
 465
 466         default:
 467             DPRINTF("Unexpected read (len %d)\n", len);
 468             goto fail;
 469         }
 470         break;
 471
 472     default:
 473         DPRINTF("Bad token\n");
 474     fail:
 475         ret = USB_RET_STALL;
 476         break;
 477     }
 478
 479     return ret;
 480 }
 481
 482 static void usb_msd_password_cb(void *opaque, int err)
 483 {
 484     MSDState *s = opaque;
 485
 486     if (!err)
 487         usb_device_attach(&s->dev);
 488     else
 489         qdev_unplug(&s->dev.qdev);
 490 }
 491
 492 static int usb_msd_initfn(USBDevice *dev)
 493 {
 494     MSDState *s = DO_UPCAST(MSDState, dev, dev);
 495     BlockDriverState *bs = s->conf.bs;
 496     DriveInfo *dinfo;
 497
 498     if (!bs) {
 499         error_report("usb-msd: drive property not set");
 500         return -1;
 501     }
 502
 503     /*
 504      * Hack alert: this pretends to be a block device, but it's really
 505      * a SCSI bus that can serve only a single device, which it
 506      * creates automatically.  But first it needs to detach from its
 507      * blockdev, or else scsi_bus_legacy_add_drive() dies when it
 508      * attaches again.
 509      *
 510      * The hack is probably a bad idea.
 511      */
 512     bdrv_detach(bs, &s->dev.qdev);
 513     s->conf.bs = NULL;
 514
 515     dinfo = drive_get_by_blockdev(bs);
 516     if (dinfo && dinfo->serial) {
 517         usb_desc_set_string(dev, STR_SERIALNUMBER, dinfo->serial);
 518     }
 519
 520     usb_desc_init(dev);
 521     scsi_bus_new(&s->bus, &s->dev.qdev, 0, 1, usb_msd_command_complete);
 522     s->scsi_dev = scsi_bus_legacy_add_drive(&s->bus, bs, 0, !!s->removable);
 523     if (!s->scsi_dev) {
 524         return -1;
 525     }
 526     s->bus.qbus.allow_hotplug = 0;
 527     usb_msd_handle_reset(dev);
 528
 529     if (bdrv_key_required(bs)) {
 530         if (cur_mon) {
 531             monitor_read_bdrv_key_start(cur_mon, bs, usb_msd_password_cb, s);
 532             s->dev.auto_attach = 0;
 533         } else {
 534             autostart = 0;
 535         }
 536     }
 537
 538     add_boot_device_path(s->conf.bootindex, &dev->qdev, "/disk@0,0");
 539     return 0;
 540 }
 541
 542 static USBDevice *usb_msd_init(const char *filename)
 543 {
 544     static int nr=0;
 545     char id[8];
 546     QemuOpts *opts;
 547     DriveInfo *dinfo;
 548     USBDevice *dev;
 549     const char *p1;
 550     char fmt[32];
 551
 552     /* parse -usbdevice disk: syntax into drive opts */
 553     snprintf(id, sizeof(id), "usb%d", nr++);
 554     opts = qemu_opts_create(qemu_find_opts("drive"), id, 0);
 555
 556     p1 = strchr(filename, ':');
 557     if (p1++) {
 558         const char *p2;
 559
 560         if (strstart(filename, "format=", &p2)) {
 561             int len = MIN(p1 - p2, sizeof(fmt));
 562             pstrcpy(fmt, len, p2);
 563             qemu_opt_set(opts, "format", fmt);
 564         } else if (*filename != ':') {
 565             printf("unrecognized USB mass-storage option %s\n", filename);
 566             return NULL;
 567         }
 568         filename = p1;
 569     }
 570     if (!*filename) {
 571         printf("block device specification needed\n");
 572         return NULL;
 573     }
 574     qemu_opt_set(opts, "file", filename);
 575     qemu_opt_set(opts, "if", "none");
 576
 577     /* create host drive */
 578     dinfo = drive_init(opts, 0);
 579     if (!dinfo) {
 580         qemu_opts_del(opts);
 581         return NULL;
 582     }
 583
 584     /* create guest device */
 585     dev = usb_create(NULL /* FIXME */, "usb-storage");
 586     if (!dev) {
 587         return NULL;
 588     }
 589     if (qdev_prop_set_drive(&dev->qdev, "drive", dinfo->bdrv) < 0) {
 590         qdev_free(&dev->qdev);
 591         return NULL;
 592     }
 593     if (qdev_init(&dev->qdev) < 0)
 594         return NULL;
 595
 596     return dev;
 597 }
 598
 599 static struct USBDeviceInfo msd_info = {
 600     .product_desc   = "QEMU USB MSD",
 601     .qdev.name      = "usb-storage",
 602     .qdev.fw_name      = "storage",
 603     .qdev.size      = sizeof(MSDState),
 604     .usb_desc       = &desc,
 605     .init           = usb_msd_initfn,
 606     .handle_packet  = usb_generic_handle_packet,
 607     .handle_attach  = usb_desc_attach,
 608     .handle_reset   = usb_msd_handle_reset,
 609     .handle_control = usb_msd_handle_control,
 610     .handle_data    = usb_msd_handle_data,
 611     .usbdevice_name = "disk",
 612     .usbdevice_init = usb_msd_init,
 613     .qdev.props     = (Property[]) {
 614         DEFINE_BLOCK_PROPERTIES(MSDState, conf),
 615         DEFINE_PROP_BIT("removable", MSDState, removable, 0, false),
 616         DEFINE_PROP_END_OF_LIST(),
 617     },
 618 };
 619
 620 static void usb_msd_register_devices(void)
 621 {
 622     usb_qdev_register(&msd_info);
 623 }
 624 device_init(usb_msd_register_devices)