hw/usb/dev-uas.c

   1 /*
   2  * UAS (USB Attached SCSI) emulation
   3  *
   4  * Copyright Red Hat, Inc. 2012
   5  *
   6  * Author: Gerd Hoffmann <[email protected]>
   7  *
   8  * This work is licensed under the terms of the GNU GPL, version 2 or later.
   9  * See the COPYING file in the top-level directory.
  10  */
  11
  12 #include "qemu-common.h"
  13 #include "qemu/option.h"
  14 #include "qemu/config-file.h"
  15 #include "trace.h"
  16
  17 #include "hw/usb.h"
  18 #include "hw/usb/desc.h"
  19 #include "hw/scsi/scsi.h"
  20 #include "block/scsi.h"
  21
  22 /* --------------------------------------------------------------------- */
  23
  24 #define UAS_UI_COMMAND              0x01
  25 #define UAS_UI_SENSE                0x03
  26 #define UAS_UI_RESPONSE             0x04
  27 #define UAS_UI_TASK_MGMT            0x05
  28 #define UAS_UI_READ_READY           0x06
  29 #define UAS_UI_WRITE_READY          0x07
  30
  31 #define UAS_RC_TMF_COMPLETE         0x00
  32 #define UAS_RC_INVALID_INFO_UNIT    0x02
  33 #define UAS_RC_TMF_NOT_SUPPORTED    0x04
  34 #define UAS_RC_TMF_FAILED           0x05
  35 #define UAS_RC_TMF_SUCCEEDED        0x08
  36 #define UAS_RC_INCORRECT_LUN        0x09
  37 #define UAS_RC_OVERLAPPED_TAG       0x0a
  38
  39 #define UAS_TMF_ABORT_TASK          0x01
  40 #define UAS_TMF_ABORT_TASK_SET      0x02
  41 #define UAS_TMF_CLEAR_TASK_SET      0x04
  42 #define UAS_TMF_LOGICAL_UNIT_RESET  0x08
  43 #define UAS_TMF_I_T_NEXUS_RESET     0x10
  44 #define UAS_TMF_CLEAR_ACA           0x40
  45 #define UAS_TMF_QUERY_TASK          0x80
  46 #define UAS_TMF_QUERY_TASK_SET      0x81
  47 #define UAS_TMF_QUERY_ASYNC_EVENT   0x82
  48
  49 #define UAS_PIPE_ID_COMMAND         0x01
  50 #define UAS_PIPE_ID_STATUS          0x02
  51 #define UAS_PIPE_ID_DATA_IN         0x03
  52 #define UAS_PIPE_ID_DATA_OUT        0x04
  53
  54 typedef struct {
  55     uint8_t    id;
  56     uint8_t    reserved;
  57     uint16_t   tag;
  58 } QEMU_PACKED  uas_ui_header;
  59
  60 typedef struct {
  61     uint8_t    prio_taskattr;   /* 6:3 priority, 2:0 task attribute   */
  62     uint8_t    reserved_1;
  63     uint8_t    add_cdb_length;  /* 7:2 additional adb length (dwords) */
  64     uint8_t    reserved_2;
  65     uint64_t   lun;
  66     uint8_t    cdb[16];
  67     uint8_t    add_cdb[];
  68 } QEMU_PACKED  uas_ui_command;
  69
  70 typedef struct {
  71     uint16_t   status_qualifier;
  72     uint8_t    status;
  73     uint8_t    reserved[7];
  74     uint16_t   sense_length;
  75     uint8_t    sense_data[18];
  76 } QEMU_PACKED  uas_ui_sense;
  77
  78 typedef struct {
  79     uint16_t   add_response_info;
  80     uint8_t    response_code;
  81 } QEMU_PACKED  uas_ui_response;
  82
  83 typedef struct {
  84     uint8_t    function;
  85     uint8_t    reserved;
  86     uint16_t   task_tag;
  87     uint64_t   lun;
  88 } QEMU_PACKED  uas_ui_task_mgmt;
  89
  90 typedef struct {
  91     uas_ui_header  hdr;
  92     union {
  93         uas_ui_command   command;
  94         uas_ui_sense     sense;
  95         uas_ui_task_mgmt task;
  96         uas_ui_response  response;
  97     };
  98 } QEMU_PACKED  uas_ui;
  99
 100 /* --------------------------------------------------------------------- */
 101
 102 #define UAS_STREAM_BM_ATTR  4
 103 #define UAS_MAX_STREAMS     (1 << UAS_STREAM_BM_ATTR)
 104
 105 typedef struct UASDevice UASDevice;
 106 typedef struct UASRequest UASRequest;
 107 typedef struct UASStatus UASStatus;
 108
 109 struct UASDevice {
 110     USBDevice                 dev;
 111     SCSIBus                   bus;
 112     QEMUBH                    *status_bh;
 113     QTAILQ_HEAD(, UASStatus)  results;
 114     QTAILQ_HEAD(, UASRequest) requests;
 115
 116     /* properties */
 117     uint32_t                  requestlog;
 118
 119     /* usb 2.0 only */
 120     USBPacket                 *status2;
 121     UASRequest                *datain2;
 122     UASRequest                *dataout2;
 123
 124     /* usb 3.0 only */
 125     USBPacket                 *data3[UAS_MAX_STREAMS];
 126     USBPacket                 *status3[UAS_MAX_STREAMS];
 127 };
 128
 129 struct UASRequest {
 130     uint16_t     tag;
 131     uint64_t     lun;
 132     UASDevice    *uas;
 133     SCSIDevice   *dev;
 134     SCSIRequest  *req;
 135     USBPacket    *data;
 136     bool         data_async;
 137     bool         active;
 138     bool         complete;
 139     uint32_t     buf_off;
 140     uint32_t     buf_size;
 141     uint32_t     data_off;
 142     uint32_t     data_size;
 143     QTAILQ_ENTRY(UASRequest)  next;
 144 };
 145
 146 struct UASStatus {
 147     uint32_t                  stream;
 148     uas_ui                    status;
 149     uint32_t                  length;
 150     QTAILQ_ENTRY(UASStatus)   next;
 151 };
 152
 153 /* --------------------------------------------------------------------- */
 154
 155 enum {
 156     STR_MANUFACTURER = 1,
 157     STR_PRODUCT,
 158     STR_SERIALNUMBER,
 159     STR_CONFIG_HIGH,
 160     STR_CONFIG_SUPER,
 161 };
 162
 163 static const USBDescStrings desc_strings = {
 164     [STR_MANUFACTURER] = "QEMU",
 165     [STR_PRODUCT]      = "USB Attached SCSI HBA",
 166     [STR_SERIALNUMBER] = "27842",
 167     [STR_CONFIG_HIGH]  = "High speed config (usb 2.0)",
 168     [STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
 169 };
 170
 171 static const USBDescIface desc_iface_high = {
 172     .bInterfaceNumber              = 0,
 173     .bNumEndpoints                 = 4,
 174     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 175     .bInterfaceSubClass            = 0x06, /* SCSI */
 176     .bInterfaceProtocol            = 0x62, /* UAS  */
 177     .eps = (USBDescEndpoint[]) {
 178         {
 179             .bEndpointAddress      = USB_DIR_OUT | UAS_PIPE_ID_COMMAND,
 180             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 181             .wMaxPacketSize        = 512,
 182             .extra = (uint8_t[]) {
 183                 0x04,  /*  u8  bLength */
 184                 0x24,  /*  u8  bDescriptorType */
 185                 UAS_PIPE_ID_COMMAND,
 186                 0x00,  /*  u8  bReserved */
 187             },
 188         },{
 189             .bEndpointAddress      = USB_DIR_IN | UAS_PIPE_ID_STATUS,
 190             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 191             .wMaxPacketSize        = 512,
 192             .extra = (uint8_t[]) {
 193                 0x04,  /*  u8  bLength */
 194                 0x24,  /*  u8  bDescriptorType */
 195                 UAS_PIPE_ID_STATUS,
 196                 0x00,  /*  u8  bReserved */
 197             },
 198         },{
 199             .bEndpointAddress      = USB_DIR_IN | UAS_PIPE_ID_DATA_IN,
 200             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 201             .wMaxPacketSize        = 512,
 202             .extra = (uint8_t[]) {
 203                 0x04,  /*  u8  bLength */
 204                 0x24,  /*  u8  bDescriptorType */
 205                 UAS_PIPE_ID_DATA_IN,
 206                 0x00,  /*  u8  bReserved */
 207             },
 208         },{
 209             .bEndpointAddress      = USB_DIR_OUT | UAS_PIPE_ID_DATA_OUT,
 210             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 211             .wMaxPacketSize        = 512,
 212             .extra = (uint8_t[]) {
 213                 0x04,  /*  u8  bLength */
 214                 0x24,  /*  u8  bDescriptorType */
 215                 UAS_PIPE_ID_DATA_OUT,
 216                 0x00,  /*  u8  bReserved */
 217             },
 218         },
 219     }
 220 };
 221
 222 static const USBDescIface desc_iface_super = {
 223     .bInterfaceNumber              = 0,
 224     .bNumEndpoints                 = 4,
 225     .bInterfaceClass               = USB_CLASS_MASS_STORAGE,
 226     .bInterfaceSubClass            = 0x06, /* SCSI */
 227     .bInterfaceProtocol            = 0x62, /* UAS  */
 228     .eps = (USBDescEndpoint[]) {
 229         {
 230             .bEndpointAddress      = USB_DIR_OUT | UAS_PIPE_ID_COMMAND,
 231             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 232             .wMaxPacketSize        = 1024,
 233             .bMaxBurst             = 15,
 234             .extra = (uint8_t[]) {
 235                 0x04,  /*  u8  bLength */
 236                 0x24,  /*  u8  bDescriptorType */
 237                 UAS_PIPE_ID_COMMAND,
 238                 0x00,  /*  u8  bReserved */
 239             },
 240         },{
 241             .bEndpointAddress      = USB_DIR_IN | UAS_PIPE_ID_STATUS,
 242             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 243             .wMaxPacketSize        = 1024,
 244             .bMaxBurst             = 15,
 245             .bmAttributes_super    = UAS_STREAM_BM_ATTR,
 246             .extra = (uint8_t[]) {
 247                 0x04,  /*  u8  bLength */
 248                 0x24,  /*  u8  bDescriptorType */
 249                 UAS_PIPE_ID_STATUS,
 250                 0x00,  /*  u8  bReserved */
 251             },
 252         },{
 253             .bEndpointAddress      = USB_DIR_IN | UAS_PIPE_ID_DATA_IN,
 254             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 255             .wMaxPacketSize        = 1024,
 256             .bMaxBurst             = 15,
 257             .bmAttributes_super    = UAS_STREAM_BM_ATTR,
 258             .extra = (uint8_t[]) {
 259                 0x04,  /*  u8  bLength */
 260                 0x24,  /*  u8  bDescriptorType */
 261                 UAS_PIPE_ID_DATA_IN,
 262                 0x00,  /*  u8  bReserved */
 263             },
 264         },{
 265             .bEndpointAddress      = USB_DIR_OUT | UAS_PIPE_ID_DATA_OUT,
 266             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 267             .wMaxPacketSize        = 1024,
 268             .bMaxBurst             = 15,
 269             .bmAttributes_super    = UAS_STREAM_BM_ATTR,
 270             .extra = (uint8_t[]) {
 271                 0x04,  /*  u8  bLength */
 272                 0x24,  /*  u8  bDescriptorType */
 273                 UAS_PIPE_ID_DATA_OUT,
 274                 0x00,  /*  u8  bReserved */
 275             },
 276         },
 277     }
 278 };
 279
 280 static const USBDescDevice desc_device_high = {
 281     .bcdUSB                        = 0x0200,
 282     .bMaxPacketSize0               = 64,
 283     .bNumConfigurations            = 1,
 284     .confs = (USBDescConfig[]) {
 285         {
 286             .bNumInterfaces        = 1,
 287             .bConfigurationValue   = 1,
 288             .iConfiguration        = STR_CONFIG_HIGH,
 289             .bmAttributes          = 0xc0,
 290             .nif = 1,
 291             .ifs = &desc_iface_high,
 292         },
 293     },
 294 };
 295
 296 static const USBDescDevice desc_device_super = {
 297     .bcdUSB                        = 0x0300,
 298     .bMaxPacketSize0               = 64,
 299     .bNumConfigurations            = 1,
 300     .confs = (USBDescConfig[]) {
 301         {
 302             .bNumInterfaces        = 1,
 303             .bConfigurationValue   = 1,
 304             .iConfiguration        = STR_CONFIG_SUPER,
 305             .bmAttributes          = 0xc0,
 306             .nif = 1,
 307             .ifs = &desc_iface_super,
 308         },
 309     },
 310 };
 311
 312 static const USBDesc desc = {
 313     .id = {
 314         .idVendor          = 0x46f4, /* CRC16() of "QEMU" */
 315         .idProduct         = 0x0003,
 316         .bcdDevice         = 0,
 317         .iManufacturer     = STR_MANUFACTURER,
 318         .iProduct          = STR_PRODUCT,
 319         .iSerialNumber     = STR_SERIALNUMBER,
 320     },
 321     .high  = &desc_device_high,
 322     .super = &desc_device_super,
 323     .str   = desc_strings,
 324 };
 325
 326 /* --------------------------------------------------------------------- */
 327
 328 static bool uas_using_streams(UASDevice *uas)
 329 {
 330     return uas->dev.speed == USB_SPEED_SUPER;
 331 }
 332
 333 /* --------------------------------------------------------------------- */
 334
 335 static UASStatus *usb_uas_alloc_status(UASDevice *uas, uint8_t id, uint16_t tag)
 336 {
 337     UASStatus *st = g_new0(UASStatus, 1);
 338
 339     st->status.hdr.id = id;
 340     st->status.hdr.tag = cpu_to_be16(tag);
 341     st->length = sizeof(uas_ui_header);
 342     if (uas_using_streams(uas)) {
 343         st->stream = tag;
 344     }
 345     return st;
 346 }
 347
 348 static void usb_uas_send_status_bh(void *opaque)
 349 {
 350     UASDevice *uas = opaque;
 351     UASStatus *st;
 352     USBPacket *p;
 353
 354     while ((st = QTAILQ_FIRST(&uas->results)) != NULL) {
 355         if (uas_using_streams(uas)) {
 356             p = uas->status3[st->stream];
 357             uas->status3[st->stream] = NULL;
 358         } else {
 359             p = uas->status2;
 360             uas->status2 = NULL;
 361         }
 362         if (p == NULL) {
 363             break;
 364         }
 365
 366         usb_packet_copy(p, &st->status, st->length);
 367         QTAILQ_REMOVE(&uas->results, st, next);
 368         g_free(st);
 369
 370         p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
 371         usb_packet_complete(&uas->dev, p);
 372     }
 373 }
 374
 375 static void usb_uas_queue_status(UASDevice *uas, UASStatus *st, int length)
 376 {
 377     USBPacket *p = uas_using_streams(uas) ?
 378         uas->status3[st->stream] : uas->status2;
 379
 380     st->length += length;
 381     QTAILQ_INSERT_TAIL(&uas->results, st, next);
 382     if (p) {
 383         /*
 384          * Just schedule bh make sure any in-flight data transaction
 385          * is finished before completing (sending) the status packet.
 386          */
 387         qemu_bh_schedule(uas->status_bh);
 388     } else {
 389         USBEndpoint *ep = usb_ep_get(&uas->dev, USB_TOKEN_IN,
 390                                      UAS_PIPE_ID_STATUS);
 391         usb_wakeup(ep, st->stream);
 392     }
 393 }
 394
 395 static void usb_uas_queue_response(UASDevice *uas, uint16_t tag,
 396                                    uint8_t code, uint16_t add_info)
 397 {
 398     UASStatus *st = usb_uas_alloc_status(uas, UAS_UI_RESPONSE, tag);
 399
 400     trace_usb_uas_response(uas->dev.addr, tag, code);
 401     st->status.response.response_code = code;
 402     st->status.response.add_response_info = cpu_to_be16(add_info);
 403     usb_uas_queue_status(uas, st, sizeof(uas_ui_response));
 404 }
 405
 406 static void usb_uas_queue_sense(UASRequest *req, uint8_t status)
 407 {
 408     UASStatus *st = usb_uas_alloc_status(req->uas, UAS_UI_SENSE, req->tag);
 409     int len, slen = 0;
 410
 411     trace_usb_uas_sense(req->uas->dev.addr, req->tag, status);
 412     st->status.sense.status = status;
 413     st->status.sense.status_qualifier = cpu_to_be16(0);
 414     if (status != GOOD) {
 415         slen = scsi_req_get_sense(req->req, st->status.sense.sense_data,
 416                                   sizeof(st->status.sense.sense_data));
 417         st->status.sense.sense_length = cpu_to_be16(slen);
 418     }
 419     len = sizeof(uas_ui_sense) - sizeof(st->status.sense.sense_data) + slen;
 420     usb_uas_queue_status(req->uas, st, len);
 421 }
 422
 423 static void usb_uas_queue_read_ready(UASRequest *req)
 424 {
 425     UASStatus *st = usb_uas_alloc_status(req->uas, UAS_UI_READ_READY,
 426                                          req->tag);
 427
 428     trace_usb_uas_read_ready(req->uas->dev.addr, req->tag);
 429     usb_uas_queue_status(req->uas, st, 0);
 430 }
 431
 432 static void usb_uas_queue_write_ready(UASRequest *req)
 433 {
 434     UASStatus *st = usb_uas_alloc_status(req->uas, UAS_UI_WRITE_READY,
 435                                          req->tag);
 436
 437     trace_usb_uas_write_ready(req->uas->dev.addr, req->tag);
 438     usb_uas_queue_status(req->uas, st, 0);
 439 }
 440
 441 /* --------------------------------------------------------------------- */
 442
 443 static int usb_uas_get_lun(uint64_t lun64)
 444 {
 445     return (lun64 >> 48) & 0xff;
 446 }
 447
 448 static SCSIDevice *usb_uas_get_dev(UASDevice *uas, uint64_t lun64)
 449 {
 450     if ((lun64 >> 56) != 0x00) {
 451         return NULL;
 452     }
 453     return scsi_device_find(&uas->bus, 0, 0, usb_uas_get_lun(lun64));
 454 }
 455
 456 static void usb_uas_complete_data_packet(UASRequest *req)
 457 {
 458     USBPacket *p;
 459
 460     if (!req->data_async) {
 461         return;
 462     }
 463     p = req->data;
 464     req->data = NULL;
 465     req->data_async = false;
 466     p->status = USB_RET_SUCCESS; /* Clear previous ASYNC status */
 467     usb_packet_complete(&req->uas->dev, p);
 468 }
 469
 470 static void usb_uas_copy_data(UASRequest *req)
 471 {
 472     uint32_t length;
 473
 474     length = MIN(req->buf_size - req->buf_off,
 475                  req->data->iov.size - req->data->actual_length);
 476     trace_usb_uas_xfer_data(req->uas->dev.addr, req->tag, length,
 477                             req->data->actual_length, req->data->iov.size,
 478                             req->buf_off, req->buf_size);
 479     usb_packet_copy(req->data, scsi_req_get_buf(req->req) + req->buf_off,
 480                     length);
 481     req->buf_off += length;
 482     req->data_off += length;
 483
 484     if (req->data->actual_length == req->data->iov.size) {
 485         usb_uas_complete_data_packet(req);
 486     }
 487     if (req->buf_size && req->buf_off == req->buf_size) {
 488         req->buf_off = 0;
 489         req->buf_size = 0;
 490         scsi_req_continue(req->req);
 491     }
 492 }
 493
 494 static void usb_uas_start_next_transfer(UASDevice *uas)
 495 {
 496     UASRequest *req;
 497
 498     if (uas_using_streams(uas)) {
 499         return;
 500     }
 501
 502     QTAILQ_FOREACH(req, &uas->requests, next) {
 503         if (req->active || req->complete) {
 504             continue;
 505         }
 506         if (req->req->cmd.mode == SCSI_XFER_FROM_DEV && uas->datain2 == NULL) {
 507             uas->datain2 = req;
 508             usb_uas_queue_read_ready(req);
 509             req->active = true;
 510             return;
 511         }
 512         if (req->req->cmd.mode == SCSI_XFER_TO_DEV && uas->dataout2 == NULL) {
 513             uas->dataout2 = req;
 514             usb_uas_queue_write_ready(req);
 515             req->active = true;
 516             return;
 517         }
 518     }
 519 }
 520
 521 static UASRequest *usb_uas_alloc_request(UASDevice *uas, uas_ui *ui)
 522 {
 523     UASRequest *req;
 524
 525     req = g_new0(UASRequest, 1);
 526     req->uas = uas;
 527     req->tag = be16_to_cpu(ui->hdr.tag);
 528     req->lun = be64_to_cpu(ui->command.lun);
 529     req->dev = usb_uas_get_dev(req->uas, req->lun);
 530     return req;
 531 }
 532
 533 static void usb_uas_scsi_free_request(SCSIBus *bus, void *priv)
 534 {
 535     UASRequest *req = priv;
 536     UASDevice *uas = req->uas;
 537
 538     if (req == uas->datain2) {
 539         uas->datain2 = NULL;
 540     }
 541     if (req == uas->dataout2) {
 542         uas->dataout2 = NULL;
 543     }
 544     QTAILQ_REMOVE(&uas->requests, req, next);
 545     g_free(req);
 546     usb_uas_start_next_transfer(uas);
 547 }
 548
 549 static UASRequest *usb_uas_find_request(UASDevice *uas, uint16_t tag)
 550 {
 551     UASRequest *req;
 552
 553     QTAILQ_FOREACH(req, &uas->requests, next) {
 554         if (req->tag == tag) {
 555             return req;
 556         }
 557     }
 558     return NULL;
 559 }
 560
 561 static void usb_uas_scsi_transfer_data(SCSIRequest *r, uint32_t len)
 562 {
 563     UASRequest *req = r->hba_private;
 564
 565     trace_usb_uas_scsi_data(req->uas->dev.addr, req->tag, len);
 566     req->buf_off = 0;
 567     req->buf_size = len;
 568     if (req->data) {
 569         usb_uas_copy_data(req);
 570     } else {
 571         usb_uas_start_next_transfer(req->uas);
 572     }
 573 }
 574
 575 static void usb_uas_scsi_command_complete(SCSIRequest *r,
 576                                           uint32_t status, size_t resid)
 577 {
 578     UASRequest *req = r->hba_private;
 579
 580     trace_usb_uas_scsi_complete(req->uas->dev.addr, req->tag, status, resid);
 581     req->complete = true;
 582     if (req->data) {
 583         usb_uas_complete_data_packet(req);
 584     }
 585     usb_uas_queue_sense(req, status);
 586     scsi_req_unref(req->req);
 587 }
 588
 589 static void usb_uas_scsi_request_cancelled(SCSIRequest *r)
 590 {
 591     UASRequest *req = r->hba_private;
 592
 593     /* FIXME: queue notification to status pipe? */
 594     scsi_req_unref(req->req);
 595 }
 596
 597 static const struct SCSIBusInfo usb_uas_scsi_info = {
 598     .tcq = true,
 599     .max_target = 0,
 600     .max_lun = 255,
 601
 602     .transfer_data = usb_uas_scsi_transfer_data,
 603     .complete = usb_uas_scsi_command_complete,
 604     .cancel = usb_uas_scsi_request_cancelled,
 605     .free_request = usb_uas_scsi_free_request,
 606 };
 607
 608 /* --------------------------------------------------------------------- */
 609
 610 static void usb_uas_handle_reset(USBDevice *dev)
 611 {
 612     UASDevice *uas = DO_UPCAST(UASDevice, dev, dev);
 613     UASRequest *req, *nreq;
 614     UASStatus *st, *nst;
 615
 616     trace_usb_uas_reset(dev->addr);
 617     QTAILQ_FOREACH_SAFE(req, &uas->requests, next, nreq) {
 618         scsi_req_cancel(req->req);
 619     }
 620     QTAILQ_FOREACH_SAFE(st, &uas->results, next, nst) {
 621         QTAILQ_REMOVE(&uas->results, st, next);
 622         g_free(st);
 623     }
 624 }
 625
 626 static void usb_uas_handle_control(USBDevice *dev, USBPacket *p,
 627                int request, int value, int index, int length, uint8_t *data)
 628 {
 629     int ret;
 630
 631     ret = usb_desc_handle_control(dev, p, request, value, index, length, data);
 632     if (ret >= 0) {
 633         return;
 634     }
 635     fprintf(stderr, "%s: unhandled control request\n", __func__);
 636     p->status = USB_RET_STALL;
 637 }
 638
 639 static void usb_uas_cancel_io(USBDevice *dev, USBPacket *p)
 640 {
 641     UASDevice *uas = DO_UPCAST(UASDevice, dev, dev);
 642     UASRequest *req, *nreq;
 643     int i;
 644
 645     if (uas->status2 == p) {
 646         uas->status2 = NULL;
 647         qemu_bh_cancel(uas->status_bh);
 648         return;
 649     }
 650     if (uas_using_streams(uas)) {
 651         for (i = 0; i < UAS_MAX_STREAMS; i++) {
 652             if (uas->status3[i] == p) {
 653                 uas->status3[i] = NULL;
 654                 return;
 655             }
 656             if (uas->data3[i] == p) {
 657                 uas->data3[i] = NULL;
 658                 return;
 659             }
 660         }
 661     }
 662     QTAILQ_FOREACH_SAFE(req, &uas->requests, next, nreq) {
 663         if (req->data == p) {
 664             req->data = NULL;
 665             return;
 666         }
 667     }
 668     assert(!"canceled usb packet not found");
 669 }
 670
 671 static void usb_uas_command(UASDevice *uas, uas_ui *ui)
 672 {
 673     UASRequest *req;
 674     uint32_t len;
 675
 676     req = usb_uas_find_request(uas, be16_to_cpu(ui->hdr.tag));
 677     if (req) {
 678         goto overlapped_tag;
 679     }
 680     req = usb_uas_alloc_request(uas, ui);
 681     if (req->dev == NULL) {
 682         goto bad_target;
 683     }
 684
 685     trace_usb_uas_command(uas->dev.addr, req->tag,
 686                           usb_uas_get_lun(req->lun),
 687                           req->lun >> 32, req->lun & 0xffffffff);
 688     QTAILQ_INSERT_TAIL(&uas->requests, req, next);
 689     if (uas_using_streams(uas) && uas->data3[req->tag] != NULL) {
 690         req->data = uas->data3[req->tag];
 691         req->data_async = true;
 692         uas->data3[req->tag] = NULL;
 693     }
 694
 695     req->req = scsi_req_new(req->dev, req->tag,
 696                             usb_uas_get_lun(req->lun),
 697                             ui->command.cdb, req);
 698     if (uas->requestlog) {
 699         scsi_req_print(req->req);
 700     }
 701     len = scsi_req_enqueue(req->req);
 702     if (len) {
 703         req->data_size = len;
 704         scsi_req_continue(req->req);
 705     }
 706     return;
 707
 708 overlapped_tag:
 709     usb_uas_queue_response(uas, req->tag, UAS_RC_OVERLAPPED_TAG, 0);
 710     return;
 711
 712 bad_target:
 713     /*
 714      * FIXME: Seems to upset linux, is this wrong?
 715      * NOTE: Happens only with no scsi devices at the bus, not sure
 716      *       this is a valid UAS setup in the first place.
 717      */
 718     usb_uas_queue_response(uas, req->tag, UAS_RC_INVALID_INFO_UNIT, 0);
 719     g_free(req);
 720 }
 721
 722 static void usb_uas_task(UASDevice *uas, uas_ui *ui)
 723 {
 724     uint16_t tag = be16_to_cpu(ui->hdr.tag);
 725     uint64_t lun64 = be64_to_cpu(ui->task.lun);
 726     SCSIDevice *dev = usb_uas_get_dev(uas, lun64);
 727     int lun = usb_uas_get_lun(lun64);
 728     UASRequest *req;
 729     uint16_t task_tag;
 730
 731     req = usb_uas_find_request(uas, be16_to_cpu(ui->hdr.tag));
 732     if (req) {
 733         goto overlapped_tag;
 734     }
 735
 736     switch (ui->task.function) {
 737     case UAS_TMF_ABORT_TASK:
 738         task_tag = be16_to_cpu(ui->task.task_tag);
 739         trace_usb_uas_tmf_abort_task(uas->dev.addr, tag, task_tag);
 740         if (dev == NULL) {
 741             goto bad_target;
 742         }
 743         if (dev->lun != lun) {
 744             goto incorrect_lun;
 745         }
 746         req = usb_uas_find_request(uas, task_tag);
 747         if (req && req->dev == dev) {
 748             scsi_req_cancel(req->req);
 749         }
 750         usb_uas_queue_response(uas, tag, UAS_RC_TMF_COMPLETE, 0);
 751         break;
 752
 753     case UAS_TMF_LOGICAL_UNIT_RESET:
 754         trace_usb_uas_tmf_logical_unit_reset(uas->dev.addr, tag, lun);
 755         if (dev == NULL) {
 756             goto bad_target;
 757         }
 758         if (dev->lun != lun) {
 759             goto incorrect_lun;
 760         }
 761         qdev_reset_all(&dev->qdev);
 762         usb_uas_queue_response(uas, tag, UAS_RC_TMF_COMPLETE, 0);
 763         break;
 764
 765     default:
 766         trace_usb_uas_tmf_unsupported(uas->dev.addr, tag, ui->task.function);
 767         usb_uas_queue_response(uas, tag, UAS_RC_TMF_NOT_SUPPORTED, 0);
 768         break;
 769     }
 770     return;
 771
 772 overlapped_tag:
 773     usb_uas_queue_response(uas, req->tag, UAS_RC_OVERLAPPED_TAG, 0);
 774     return;
 775
 776 bad_target:
 777     /* FIXME: correct?  [see long comment in usb_uas_command()] */
 778     usb_uas_queue_response(uas, tag, UAS_RC_INVALID_INFO_UNIT, 0);
 779     return;
 780
 781 incorrect_lun:
 782     usb_uas_queue_response(uas, tag, UAS_RC_INCORRECT_LUN, 0);
 783 }
 784
 785 static void usb_uas_handle_data(USBDevice *dev, USBPacket *p)
 786 {
 787     UASDevice *uas = DO_UPCAST(UASDevice, dev, dev);
 788     uas_ui ui;
 789     UASStatus *st;
 790     UASRequest *req;
 791     int length;
 792
 793     switch (p->ep->nr) {
 794     case UAS_PIPE_ID_COMMAND:
 795         length = MIN(sizeof(ui), p->iov.size);
 796         usb_packet_copy(p, &ui, length);
 797         switch (ui.hdr.id) {
 798         case UAS_UI_COMMAND:
 799             usb_uas_command(uas, &ui);
 800             break;
 801         case UAS_UI_TASK_MGMT:
 802             usb_uas_task(uas, &ui);
 803             break;
 804         default:
 805             fprintf(stderr, "%s: unknown command ui: id 0x%x\n",
 806                     __func__, ui.hdr.id);
 807             p->status = USB_RET_STALL;
 808             break;
 809         }
 810         break;
 811     case UAS_PIPE_ID_STATUS:
 812         if (p->stream) {
 813             QTAILQ_FOREACH(st, &uas->results, next) {
 814                 if (st->stream == p->stream) {
 815                     break;
 816                 }
 817             }
 818             if (st == NULL) {
 819                 assert(uas->status3[p->stream] == NULL);
 820                 uas->status3[p->stream] = p;
 821                 p->status = USB_RET_ASYNC;
 822                 break;
 823             }
 824         } else {
 825             st = QTAILQ_FIRST(&uas->results);
 826             if (st == NULL) {
 827                 assert(uas->status2 == NULL);
 828                 uas->status2 = p;
 829                 p->status = USB_RET_ASYNC;
 830                 break;
 831             }
 832         }
 833         usb_packet_copy(p, &st->status, st->length);
 834         QTAILQ_REMOVE(&uas->results, st, next);
 835         g_free(st);
 836         break;
 837     case UAS_PIPE_ID_DATA_IN:
 838     case UAS_PIPE_ID_DATA_OUT:
 839         if (p->stream) {
 840             req = usb_uas_find_request(uas, p->stream);
 841         } else {
 842             req = (p->ep->nr == UAS_PIPE_ID_DATA_IN)
 843                 ? uas->datain2 : uas->dataout2;
 844         }
 845         if (req == NULL) {
 846             if (p->stream) {
 847                 assert(uas->data3[p->stream] == NULL);
 848                 uas->data3[p->stream] = p;
 849                 p->status = USB_RET_ASYNC;
 850                 break;
 851             } else {
 852                 fprintf(stderr, "%s: no inflight request\n", __func__);
 853                 p->status = USB_RET_STALL;
 854                 break;
 855             }
 856         }
 857         scsi_req_ref(req->req);
 858         req->data = p;
 859         usb_uas_copy_data(req);
 860         if (p->actual_length == p->iov.size || req->complete) {
 861             req->data = NULL;
 862         } else {
 863             req->data_async = true;
 864             p->status = USB_RET_ASYNC;
 865         }
 866         scsi_req_unref(req->req);
 867         usb_uas_start_next_transfer(uas);
 868         break;
 869     default:
 870         fprintf(stderr, "%s: invalid endpoint %d\n", __func__, p->ep->nr);
 871         p->status = USB_RET_STALL;
 872         break;
 873     }
 874 }
 875
 876 static void usb_uas_handle_destroy(USBDevice *dev)
 877 {
 878     UASDevice *uas = DO_UPCAST(UASDevice, dev, dev);
 879
 880     qemu_bh_delete(uas->status_bh);
 881 }
 882
 883 static int usb_uas_init(USBDevice *dev)
 884 {
 885     UASDevice *uas = DO_UPCAST(UASDevice, dev, dev);
 886
 887     usb_desc_create_serial(dev);
 888     usb_desc_init(dev);
 889
 890     QTAILQ_INIT(&uas->results);
 891     QTAILQ_INIT(&uas->requests);
 892     uas->status_bh = qemu_bh_new(usb_uas_send_status_bh, uas);
 893
 894     scsi_bus_new(&uas->bus, sizeof(uas->bus), DEVICE(dev),
 895                  &usb_uas_scsi_info, NULL);
 896
 897     return 0;
 898 }
 899
 900 static const VMStateDescription vmstate_usb_uas = {
 901     .name = "usb-uas",
 902     .unmigratable = 1,
 903     .fields = (VMStateField[]) {
 904         VMSTATE_USB_DEVICE(dev, UASDevice),
 905         VMSTATE_END_OF_LIST()
 906     }
 907 };
 908
 909 static Property uas_properties[] = {
 910     DEFINE_PROP_UINT32("log-scsi-req", UASDevice, requestlog, 0),
 911     DEFINE_PROP_END_OF_LIST(),
 912 };
 913
 914 static void usb_uas_class_initfn(ObjectClass *klass, void *data)
 915 {
 916     DeviceClass *dc = DEVICE_CLASS(klass);
 917     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
 918
 919     uc->init           = usb_uas_init;
 920     uc->product_desc   = desc_strings[STR_PRODUCT];
 921     uc->usb_desc       = &desc;
 922     uc->cancel_packet  = usb_uas_cancel_io;
 923     uc->handle_attach  = usb_desc_attach;
 924     uc->handle_reset   = usb_uas_handle_reset;
 925     uc->handle_control = usb_uas_handle_control;
 926     uc->handle_data    = usb_uas_handle_data;
 927     uc->handle_destroy = usb_uas_handle_destroy;
 928     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
 929     dc->fw_name = "storage";
 930     dc->vmsd = &vmstate_usb_uas;
 931     dc->props = uas_properties;
 932 }
 933
 934 static const TypeInfo uas_info = {
 935     .name          = "usb-uas",
 936     .parent        = TYPE_USB_DEVICE,
 937     .instance_size = sizeof(UASDevice),
 938     .class_init    = usb_uas_class_initfn,
 939 };
 940
 941 static void usb_uas_register_types(void)
 942 {
 943     type_register_static(&uas_info);
 944 }
 945
 946 type_init(usb_uas_register_types)