qemu/hw/usb/host-libusb.c
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   1/*
   2 * Linux host USB redirector
   3 *
   4 * Copyright (c) 2005 Fabrice Bellard
   5 *
   6 * Copyright (c) 2008 Max Krasnyansky
   7 *      Support for host device auto connect & disconnect
   8 *      Major rewrite to support fully async operation
   9 *
  10 * Copyright 2008 TJ <linux@tjworld.net>
  11 *      Added flexible support for /dev/bus/usb /sys/bus/usb/devices in addition
  12 *      to the legacy /proc/bus/usb USB device discovery and handling
  13 *
  14 * (c) 2012 Gerd Hoffmann <kraxel@redhat.com>
  15 *      Completely rewritten to use libusb instead of usbfs ioctls.
  16 *
  17 * Permission is hereby granted, free of charge, to any person obtaining a copy
  18 * of this software and associated documentation files (the "Software"), to deal
  19 * in the Software without restriction, including without limitation the rights
  20 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  21 * copies of the Software, and to permit persons to whom the Software is
  22 * furnished to do so, subject to the following conditions:
  23 *
  24 * The above copyright notice and this permission notice shall be included in
  25 * all copies or substantial portions of the Software.
  26 *
  27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  28 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  29 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  30 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  31 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  32 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  33 * THE SOFTWARE.
  34 */
  35
  36#include "qemu/osdep.h"
  37#include "qom/object.h"
  38#ifndef CONFIG_WIN32
  39#include <poll.h>
  40#endif
  41#include <libusb.h>
  42
  43#ifdef CONFIG_LINUX
  44#include <sys/ioctl.h>
  45#include <linux/usbdevice_fs.h>
  46#endif
  47
  48#include "qapi/error.h"
  49#include "migration/vmstate.h"
  50#include "monitor/monitor.h"
  51#include "qemu/error-report.h"
  52#include "qemu/main-loop.h"
  53#include "qemu/module.h"
  54#include "sysemu/runstate.h"
  55#include "sysemu/sysemu.h"
  56#include "trace.h"
  57
  58#include "hw/qdev-properties.h"
  59#include "hw/usb.h"
  60
  61/* ------------------------------------------------------------------------ */
  62
  63#define TYPE_USB_HOST_DEVICE "usb-host"
  64OBJECT_DECLARE_SIMPLE_TYPE(USBHostDevice, USB_HOST_DEVICE)
  65
  66typedef struct USBHostRequest USBHostRequest;
  67typedef struct USBHostIsoXfer USBHostIsoXfer;
  68typedef struct USBHostIsoRing USBHostIsoRing;
  69
  70struct USBAutoFilter {
  71    uint32_t bus_num;
  72    uint32_t addr;
  73    char     *port;
  74    uint32_t vendor_id;
  75    uint32_t product_id;
  76};
  77
  78enum USBHostDeviceOptions {
  79    USB_HOST_OPT_PIPELINE,
  80};
  81
  82struct USBHostDevice {
  83    USBDevice parent_obj;
  84
  85    /* properties */
  86    struct USBAutoFilter             match;
  87    char                             *hostdevice;
  88    int32_t                          bootindex;
  89    uint32_t                         iso_urb_count;
  90    uint32_t                         iso_urb_frames;
  91    uint32_t                         options;
  92    uint32_t                         loglevel;
  93    bool                             needs_autoscan;
  94    bool                             allow_one_guest_reset;
  95    bool                             allow_all_guest_resets;
  96    bool                             suppress_remote_wake;
  97
  98    /* state */
  99    QTAILQ_ENTRY(USBHostDevice)      next;
 100    int                              seen, errcount;
 101    int                              bus_num;
 102    int                              addr;
 103    char                             port[16];
 104
 105    int                              hostfd;
 106    libusb_device                    *dev;
 107    libusb_device_handle             *dh;
 108    struct libusb_device_descriptor  ddesc;
 109
 110    struct {
 111        bool                         detached;
 112        bool                         claimed;
 113    } ifs[USB_MAX_INTERFACES];
 114
 115    /* callbacks & friends */
 116    QEMUBH                           *bh_nodev;
 117    QEMUBH                           *bh_postld;
 118    bool                             bh_postld_pending;
 119    Notifier                         exit;
 120
 121    /* request queues */
 122    QTAILQ_HEAD(, USBHostRequest)    requests;
 123    QTAILQ_HEAD(, USBHostIsoRing)    isorings;
 124};
 125
 126struct USBHostRequest {
 127    USBHostDevice                    *host;
 128    USBPacket                        *p;
 129    bool                             in;
 130    struct libusb_transfer           *xfer;
 131    unsigned char                    *buffer;
 132    unsigned char                    *cbuf;
 133    unsigned int                     clen;
 134    bool                             usb3ep0quirk;
 135    QTAILQ_ENTRY(USBHostRequest)     next;
 136};
 137
 138struct USBHostIsoXfer {
 139    USBHostIsoRing                   *ring;
 140    struct libusb_transfer           *xfer;
 141    bool                             copy_complete;
 142    unsigned int                     packet;
 143    QTAILQ_ENTRY(USBHostIsoXfer)     next;
 144};
 145
 146struct USBHostIsoRing {
 147    USBHostDevice                    *host;
 148    USBEndpoint                      *ep;
 149    QTAILQ_HEAD(, USBHostIsoXfer)    unused;
 150    QTAILQ_HEAD(, USBHostIsoXfer)    inflight;
 151    QTAILQ_HEAD(, USBHostIsoXfer)    copy;
 152    QTAILQ_ENTRY(USBHostIsoRing)     next;
 153};
 154
 155static QTAILQ_HEAD(, USBHostDevice) hostdevs =
 156    QTAILQ_HEAD_INITIALIZER(hostdevs);
 157
 158static void usb_host_auto_check(void *unused);
 159static void usb_host_release_interfaces(USBHostDevice *s);
 160static void usb_host_nodev(USBHostDevice *s);
 161static void usb_host_detach_kernel(USBHostDevice *s);
 162static void usb_host_attach_kernel(USBHostDevice *s);
 163
 164/* ------------------------------------------------------------------------ */
 165
 166#ifndef LIBUSB_LOG_LEVEL_WARNING /* older libusb didn't define these */
 167#define LIBUSB_LOG_LEVEL_WARNING 2
 168#endif
 169
 170/* ------------------------------------------------------------------------ */
 171
 172#define CONTROL_TIMEOUT  10000        /* 10 sec    */
 173#define BULK_TIMEOUT         0        /* unlimited */
 174#define INTR_TIMEOUT         0        /* unlimited */
 175
 176#ifndef LIBUSB_API_VERSION
 177# define LIBUSB_API_VERSION LIBUSBX_API_VERSION
 178#endif
 179#if LIBUSB_API_VERSION >= 0x01000103
 180# define HAVE_STREAMS 1
 181#endif
 182#if LIBUSB_API_VERSION >= 0x01000106
 183# define HAVE_SUPER_PLUS 1
 184#endif
 185
 186static const char *speed_name[] = {
 187    [LIBUSB_SPEED_UNKNOWN] = "?",
 188    [LIBUSB_SPEED_LOW]     = "1.5",
 189    [LIBUSB_SPEED_FULL]    = "12",
 190    [LIBUSB_SPEED_HIGH]    = "480",
 191    [LIBUSB_SPEED_SUPER]   = "5000",
 192#ifdef HAVE_SUPER_PLUS
 193    [LIBUSB_SPEED_SUPER_PLUS] = "5000+",
 194#endif
 195};
 196
 197static const unsigned int speed_map[] = {
 198    [LIBUSB_SPEED_LOW]     = USB_SPEED_LOW,
 199    [LIBUSB_SPEED_FULL]    = USB_SPEED_FULL,
 200    [LIBUSB_SPEED_HIGH]    = USB_SPEED_HIGH,
 201    [LIBUSB_SPEED_SUPER]   = USB_SPEED_SUPER,
 202#ifdef HAVE_SUPER_PLUS
 203    [LIBUSB_SPEED_SUPER_PLUS] = USB_SPEED_SUPER,
 204#endif
 205};
 206
 207static const unsigned int status_map[] = {
 208    [LIBUSB_TRANSFER_COMPLETED] = USB_RET_SUCCESS,
 209    [LIBUSB_TRANSFER_ERROR]     = USB_RET_IOERROR,
 210    [LIBUSB_TRANSFER_TIMED_OUT] = USB_RET_IOERROR,
 211    [LIBUSB_TRANSFER_CANCELLED] = USB_RET_IOERROR,
 212    [LIBUSB_TRANSFER_STALL]     = USB_RET_STALL,
 213    [LIBUSB_TRANSFER_NO_DEVICE] = USB_RET_NODEV,
 214    [LIBUSB_TRANSFER_OVERFLOW]  = USB_RET_BABBLE,
 215};
 216
 217static const char *err_names[] = {
 218    [-LIBUSB_ERROR_IO]               = "IO",
 219    [-LIBUSB_ERROR_INVALID_PARAM]    = "INVALID_PARAM",
 220    [-LIBUSB_ERROR_ACCESS]           = "ACCESS",
 221    [-LIBUSB_ERROR_NO_DEVICE]        = "NO_DEVICE",
 222    [-LIBUSB_ERROR_NOT_FOUND]        = "NOT_FOUND",
 223    [-LIBUSB_ERROR_BUSY]             = "BUSY",
 224    [-LIBUSB_ERROR_TIMEOUT]          = "TIMEOUT",
 225    [-LIBUSB_ERROR_OVERFLOW]         = "OVERFLOW",
 226    [-LIBUSB_ERROR_PIPE]             = "PIPE",
 227    [-LIBUSB_ERROR_INTERRUPTED]      = "INTERRUPTED",
 228    [-LIBUSB_ERROR_NO_MEM]           = "NO_MEM",
 229    [-LIBUSB_ERROR_NOT_SUPPORTED]    = "NOT_SUPPORTED",
 230    [-LIBUSB_ERROR_OTHER]            = "OTHER",
 231};
 232
 233static libusb_context *ctx;
 234static uint32_t loglevel;
 235
 236#ifndef CONFIG_WIN32
 237
 238static void usb_host_handle_fd(void *opaque)
 239{
 240    struct timeval tv = { 0, 0 };
 241    libusb_handle_events_timeout(ctx, &tv);
 242}
 243
 244static void usb_host_add_fd(int fd, short events, void *user_data)
 245{
 246    qemu_set_fd_handler(fd,
 247                        (events & POLLIN)  ? usb_host_handle_fd : NULL,
 248                        (events & POLLOUT) ? usb_host_handle_fd : NULL,
 249                        ctx);
 250}
 251
 252static void usb_host_del_fd(int fd, void *user_data)
 253{
 254    qemu_set_fd_handler(fd, NULL, NULL, NULL);
 255}
 256
 257#else
 258
 259static QEMUTimer *poll_timer;
 260static uint32_t request_count;
 261
 262static void usb_host_timer_kick(void)
 263{
 264    int64_t delay_ns;
 265
 266    delay_ns = request_count
 267        ? (NANOSECONDS_PER_SECOND / 100)  /* 10 ms interval with active req */
 268        : (NANOSECONDS_PER_SECOND);       /* 1 sec interval otherwise */
 269    timer_mod(poll_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + delay_ns);
 270}
 271
 272static void usb_host_timer(void *opaque)
 273{
 274    struct timeval tv = { 0, 0 };
 275
 276    libusb_handle_events_timeout(ctx, &tv);
 277    usb_host_timer_kick();
 278}
 279
 280#endif /* !CONFIG_WIN32 */
 281
 282static int usb_host_init(void)
 283{
 284#ifndef CONFIG_WIN32
 285    const struct libusb_pollfd **poll;
 286#endif
 287    int rc;
 288
 289    if (ctx) {
 290        return 0;
 291    }
 292    rc = libusb_init(&ctx);
 293    if (rc != 0) {
 294        return -1;
 295    }
 296#if LIBUSB_API_VERSION >= 0x01000106
 297    libusb_set_option(ctx, LIBUSB_OPTION_LOG_LEVEL, loglevel);
 298#else
 299    libusb_set_debug(ctx, loglevel);
 300#endif
 301#ifdef CONFIG_WIN32
 302    poll_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, usb_host_timer, NULL);
 303    usb_host_timer_kick();
 304#else
 305    libusb_set_pollfd_notifiers(ctx, usb_host_add_fd,
 306                                usb_host_del_fd,
 307                                ctx);
 308    poll = libusb_get_pollfds(ctx);
 309    if (poll) {
 310        int i;
 311        for (i = 0; poll[i] != NULL; i++) {
 312            usb_host_add_fd(poll[i]->fd, poll[i]->events, ctx);
 313        }
 314    }
 315    free(poll);
 316#endif
 317    return 0;
 318}
 319
 320static int usb_host_get_port(libusb_device *dev, char *port, size_t len)
 321{
 322    uint8_t path[7];
 323    size_t off;
 324    int rc, i;
 325
 326#if LIBUSB_API_VERSION >= 0x01000102
 327    rc = libusb_get_port_numbers(dev, path, 7);
 328#else
 329    rc = libusb_get_port_path(ctx, dev, path, 7);
 330#endif
 331    if (rc < 0) {
 332        return 0;
 333    }
 334    off = snprintf(port, len, "%d", path[0]);
 335    for (i = 1; i < rc; i++) {
 336        off += snprintf(port+off, len-off, ".%d", path[i]);
 337    }
 338    return off;
 339}
 340
 341static void usb_host_libusb_error(const char *func, int rc)
 342{
 343    const char *errname;
 344
 345    if (rc >= 0) {
 346        return;
 347    }
 348
 349    if (-rc < ARRAY_SIZE(err_names) && err_names[-rc]) {
 350        errname = err_names[-rc];
 351    } else {
 352        errname = "?";
 353    }
 354    error_report("%s: %d [%s]", func, rc, errname);
 355}
 356
 357/* ------------------------------------------------------------------------ */
 358
 359static bool usb_host_use_combining(USBEndpoint *ep)
 360{
 361    int type;
 362
 363    if (!ep->pipeline) {
 364        return false;
 365    }
 366    if (ep->pid != USB_TOKEN_IN) {
 367        return false;
 368    }
 369    type = usb_ep_get_type(ep->dev, ep->pid, ep->nr);
 370    if (type != USB_ENDPOINT_XFER_BULK) {
 371        return false;
 372    }
 373    return true;
 374}
 375
 376/* ------------------------------------------------------------------------ */
 377
 378static USBHostRequest *usb_host_req_alloc(USBHostDevice *s, USBPacket *p,
 379                                          bool in, size_t bufsize)
 380{
 381    USBHostRequest *r = g_new0(USBHostRequest, 1);
 382
 383    r->host = s;
 384    r->p = p;
 385    r->in = in;
 386    r->xfer = libusb_alloc_transfer(0);
 387    if (bufsize) {
 388        r->buffer = g_malloc(bufsize);
 389    }
 390    QTAILQ_INSERT_TAIL(&s->requests, r, next);
 391#ifdef CONFIG_WIN32
 392    request_count++;
 393    usb_host_timer_kick();
 394#endif
 395    return r;
 396}
 397
 398static void usb_host_req_free(USBHostRequest *r)
 399{
 400#ifdef CONFIG_WIN32
 401    request_count--;
 402#endif
 403    QTAILQ_REMOVE(&r->host->requests, r, next);
 404    libusb_free_transfer(r->xfer);
 405    g_free(r->buffer);
 406    g_free(r);
 407}
 408
 409static USBHostRequest *usb_host_req_find(USBHostDevice *s, USBPacket *p)
 410{
 411    USBHostRequest *r;
 412
 413    QTAILQ_FOREACH(r, &s->requests, next) {
 414        if (r->p == p) {
 415            return r;
 416        }
 417    }
 418    return NULL;
 419}
 420
 421static void LIBUSB_CALL usb_host_req_complete_ctrl(struct libusb_transfer *xfer)
 422{
 423    USBHostRequest *r = xfer->user_data;
 424    USBHostDevice  *s = r->host;
 425    bool disconnect = (xfer->status == LIBUSB_TRANSFER_NO_DEVICE);
 426
 427    if (r->p == NULL) {
 428        goto out; /* request was canceled */
 429    }
 430
 431    r->p->status = status_map[xfer->status];
 432    r->p->actual_length = xfer->actual_length;
 433    if (r->in && xfer->actual_length) {
 434        USBDevice *udev = USB_DEVICE(s);
 435        struct libusb_config_descriptor *conf = (void *)r->cbuf;
 436        memcpy(r->cbuf, r->buffer + 8, xfer->actual_length);
 437
 438        /* Fix up USB-3 ep0 maxpacket size to allow superspeed connected devices
 439         * to work redirected to a not superspeed capable hcd */
 440        if (r->usb3ep0quirk && xfer->actual_length >= 18 &&
 441            r->cbuf[7] == 9) {
 442            r->cbuf[7] = 64;
 443        }
 444        /*
 445         *If this is GET_DESCRIPTOR request for configuration descriptor,
 446         * remove 'remote wakeup' flag from it to prevent idle power down
 447         * in Windows guest
 448         */
 449        if (s->suppress_remote_wake &&
 450            udev->setup_buf[0] == USB_DIR_IN &&
 451            udev->setup_buf[1] == USB_REQ_GET_DESCRIPTOR &&
 452            udev->setup_buf[3] == USB_DT_CONFIG && udev->setup_buf[2] == 0 &&
 453            xfer->actual_length >
 454                offsetof(struct libusb_config_descriptor, bmAttributes) &&
 455            (conf->bmAttributes & USB_CFG_ATT_WAKEUP)) {
 456                trace_usb_host_remote_wakeup_removed(s->bus_num, s->addr);
 457                conf->bmAttributes &= ~USB_CFG_ATT_WAKEUP;
 458        }
 459    }
 460    trace_usb_host_req_complete(s->bus_num, s->addr, r->p,
 461                                r->p->status, r->p->actual_length);
 462    usb_generic_async_ctrl_complete(USB_DEVICE(s), r->p);
 463
 464out:
 465    usb_host_req_free(r);
 466    if (disconnect) {
 467        usb_host_nodev(s);
 468    }
 469}
 470
 471static void LIBUSB_CALL usb_host_req_complete_data(struct libusb_transfer *xfer)
 472{
 473    USBHostRequest *r = xfer->user_data;
 474    USBHostDevice  *s = r->host;
 475    bool disconnect = (xfer->status == LIBUSB_TRANSFER_NO_DEVICE);
 476
 477    if (r->p == NULL) {
 478        goto out; /* request was canceled */
 479    }
 480
 481    r->p->status = status_map[xfer->status];
 482    if (r->in && xfer->actual_length) {
 483        usb_packet_copy(r->p, r->buffer, xfer->actual_length);
 484    }
 485    trace_usb_host_req_complete(s->bus_num, s->addr, r->p,
 486                                r->p->status, r->p->actual_length);
 487    if (usb_host_use_combining(r->p->ep)) {
 488        usb_combined_input_packet_complete(USB_DEVICE(s), r->p);
 489    } else {
 490        usb_packet_complete(USB_DEVICE(s), r->p);
 491    }
 492
 493out:
 494    usb_host_req_free(r);
 495    if (disconnect) {
 496        usb_host_nodev(s);
 497    }
 498}
 499
 500static void usb_host_req_abort(USBHostRequest *r)
 501{
 502    USBHostDevice  *s = r->host;
 503    bool inflight = (r->p && r->p->state == USB_PACKET_ASYNC);
 504
 505    if (inflight) {
 506        r->p->status = USB_RET_NODEV;
 507        trace_usb_host_req_complete(s->bus_num, s->addr, r->p,
 508                                    r->p->status, r->p->actual_length);
 509        if (r->p->ep->nr == 0) {
 510            usb_generic_async_ctrl_complete(USB_DEVICE(s), r->p);
 511        } else {
 512            usb_packet_complete(USB_DEVICE(s), r->p);
 513        }
 514        r->p = NULL;
 515
 516        libusb_cancel_transfer(r->xfer);
 517    }
 518}
 519
 520/* ------------------------------------------------------------------------ */
 521
 522static void LIBUSB_CALL
 523usb_host_req_complete_iso(struct libusb_transfer *transfer)
 524{
 525    USBHostIsoXfer *xfer = transfer->user_data;
 526
 527    if (!xfer) {
 528        /* USBHostIsoXfer released while inflight */
 529        g_free(transfer->buffer);
 530        libusb_free_transfer(transfer);
 531        return;
 532    }
 533
 534    QTAILQ_REMOVE(&xfer->ring->inflight, xfer, next);
 535    if (QTAILQ_EMPTY(&xfer->ring->inflight)) {
 536        USBHostDevice *s = xfer->ring->host;
 537        trace_usb_host_iso_stop(s->bus_num, s->addr, xfer->ring->ep->nr);
 538    }
 539    if (xfer->ring->ep->pid == USB_TOKEN_IN) {
 540        QTAILQ_INSERT_TAIL(&xfer->ring->copy, xfer, next);
 541        usb_wakeup(xfer->ring->ep, 0);
 542    } else {
 543        QTAILQ_INSERT_TAIL(&xfer->ring->unused, xfer, next);
 544    }
 545}
 546
 547static USBHostIsoRing *usb_host_iso_alloc(USBHostDevice *s, USBEndpoint *ep)
 548{
 549    USBHostIsoRing *ring = g_new0(USBHostIsoRing, 1);
 550    USBHostIsoXfer *xfer;
 551    /* FIXME: check interval (for now assume one xfer per frame) */
 552    int packets = s->iso_urb_frames;
 553    int i;
 554
 555    ring->host = s;
 556    ring->ep = ep;
 557    QTAILQ_INIT(&ring->unused);
 558    QTAILQ_INIT(&ring->inflight);
 559    QTAILQ_INIT(&ring->copy);
 560    QTAILQ_INSERT_TAIL(&s->isorings, ring, next);
 561
 562    for (i = 0; i < s->iso_urb_count; i++) {
 563        xfer = g_new0(USBHostIsoXfer, 1);
 564        xfer->ring = ring;
 565        xfer->xfer = libusb_alloc_transfer(packets);
 566        xfer->xfer->dev_handle = s->dh;
 567        xfer->xfer->type = LIBUSB_TRANSFER_TYPE_ISOCHRONOUS;
 568
 569        xfer->xfer->endpoint = ring->ep->nr;
 570        if (ring->ep->pid == USB_TOKEN_IN) {
 571            xfer->xfer->endpoint |= USB_DIR_IN;
 572        }
 573        xfer->xfer->callback = usb_host_req_complete_iso;
 574        xfer->xfer->user_data = xfer;
 575
 576        xfer->xfer->num_iso_packets = packets;
 577        xfer->xfer->length = ring->ep->max_packet_size * packets;
 578        xfer->xfer->buffer = g_malloc0(xfer->xfer->length);
 579
 580        QTAILQ_INSERT_TAIL(&ring->unused, xfer, next);
 581    }
 582
 583    return ring;
 584}
 585
 586static USBHostIsoRing *usb_host_iso_find(USBHostDevice *s, USBEndpoint *ep)
 587{
 588    USBHostIsoRing *ring;
 589
 590    QTAILQ_FOREACH(ring, &s->isorings, next) {
 591        if (ring->ep == ep) {
 592            return ring;
 593        }
 594    }
 595    return NULL;
 596}
 597
 598static void usb_host_iso_reset_xfer(USBHostIsoXfer *xfer)
 599{
 600    libusb_set_iso_packet_lengths(xfer->xfer,
 601                                  xfer->ring->ep->max_packet_size);
 602    xfer->packet = 0;
 603    xfer->copy_complete = false;
 604}
 605
 606static void usb_host_iso_free_xfer(USBHostIsoXfer *xfer, bool inflight)
 607{
 608    if (inflight) {
 609        xfer->xfer->user_data = NULL;
 610    } else {
 611        g_free(xfer->xfer->buffer);
 612        libusb_free_transfer(xfer->xfer);
 613    }
 614    g_free(xfer);
 615}
 616
 617static void usb_host_iso_free(USBHostIsoRing *ring)
 618{
 619    USBHostIsoXfer *xfer;
 620
 621    while ((xfer = QTAILQ_FIRST(&ring->inflight)) != NULL) {
 622        QTAILQ_REMOVE(&ring->inflight, xfer, next);
 623        usb_host_iso_free_xfer(xfer, true);
 624    }
 625    while ((xfer = QTAILQ_FIRST(&ring->unused)) != NULL) {
 626        QTAILQ_REMOVE(&ring->unused, xfer, next);
 627        usb_host_iso_free_xfer(xfer, false);
 628    }
 629    while ((xfer = QTAILQ_FIRST(&ring->copy)) != NULL) {
 630        QTAILQ_REMOVE(&ring->copy, xfer, next);
 631        usb_host_iso_free_xfer(xfer, false);
 632    }
 633
 634    QTAILQ_REMOVE(&ring->host->isorings, ring, next);
 635    g_free(ring);
 636}
 637
 638static void usb_host_iso_free_all(USBHostDevice *s)
 639{
 640    USBHostIsoRing *ring;
 641
 642    while ((ring = QTAILQ_FIRST(&s->isorings)) != NULL) {
 643        usb_host_iso_free(ring);
 644    }
 645}
 646
 647static bool usb_host_iso_data_copy(USBHostIsoXfer *xfer, USBPacket *p)
 648{
 649    unsigned int psize;
 650    unsigned char *buf;
 651
 652    buf = libusb_get_iso_packet_buffer_simple(xfer->xfer, xfer->packet);
 653    if (p->pid == USB_TOKEN_OUT) {
 654        psize = p->iov.size;
 655        if (psize > xfer->ring->ep->max_packet_size) {
 656            /* should not happen (guest bug) */
 657            psize = xfer->ring->ep->max_packet_size;
 658        }
 659        xfer->xfer->iso_packet_desc[xfer->packet].length = psize;
 660    } else {
 661        psize = xfer->xfer->iso_packet_desc[xfer->packet].actual_length;
 662        if (psize > p->iov.size) {
 663            /* should not happen (guest bug) */
 664            psize = p->iov.size;
 665        }
 666    }
 667    usb_packet_copy(p, buf, psize);
 668    xfer->packet++;
 669    xfer->copy_complete = (xfer->packet == xfer->xfer->num_iso_packets);
 670    return xfer->copy_complete;
 671}
 672
 673static void usb_host_iso_data_in(USBHostDevice *s, USBPacket *p)
 674{
 675    USBHostIsoRing *ring;
 676    USBHostIsoXfer *xfer;
 677    bool disconnect = false;
 678    int rc;
 679
 680    ring = usb_host_iso_find(s, p->ep);
 681    if (ring == NULL) {
 682        ring = usb_host_iso_alloc(s, p->ep);
 683    }
 684
 685    /* copy data to guest */
 686    xfer = QTAILQ_FIRST(&ring->copy);
 687    if (xfer != NULL) {
 688        if (usb_host_iso_data_copy(xfer, p)) {
 689            QTAILQ_REMOVE(&ring->copy, xfer, next);
 690            QTAILQ_INSERT_TAIL(&ring->unused, xfer, next);
 691        }
 692    }
 693
 694    /* submit empty bufs to host */
 695    while ((xfer = QTAILQ_FIRST(&ring->unused)) != NULL) {
 696        QTAILQ_REMOVE(&ring->unused, xfer, next);
 697        usb_host_iso_reset_xfer(xfer);
 698        rc = libusb_submit_transfer(xfer->xfer);
 699        if (rc != 0) {
 700            usb_host_libusb_error("libusb_submit_transfer [iso]", rc);
 701            QTAILQ_INSERT_TAIL(&ring->unused, xfer, next);
 702            if (rc == LIBUSB_ERROR_NO_DEVICE) {
 703                disconnect = true;
 704            }
 705            break;
 706        }
 707        if (QTAILQ_EMPTY(&ring->inflight)) {
 708            trace_usb_host_iso_start(s->bus_num, s->addr, p->ep->nr);
 709        }
 710        QTAILQ_INSERT_TAIL(&ring->inflight, xfer, next);
 711    }
 712
 713    if (disconnect) {
 714        usb_host_nodev(s);
 715    }
 716}
 717
 718static void usb_host_iso_data_out(USBHostDevice *s, USBPacket *p)
 719{
 720    USBHostIsoRing *ring;
 721    USBHostIsoXfer *xfer;
 722    bool disconnect = false;
 723    int rc, filled = 0;
 724
 725    ring = usb_host_iso_find(s, p->ep);
 726    if (ring == NULL) {
 727        ring = usb_host_iso_alloc(s, p->ep);
 728    }
 729
 730    /* copy data from guest */
 731    xfer = QTAILQ_FIRST(&ring->copy);
 732    while (xfer != NULL && xfer->copy_complete) {
 733        filled++;
 734        xfer = QTAILQ_NEXT(xfer, next);
 735    }
 736    if (xfer == NULL) {
 737        xfer = QTAILQ_FIRST(&ring->unused);
 738        if (xfer == NULL) {
 739            trace_usb_host_iso_out_of_bufs(s->bus_num, s->addr, p->ep->nr);
 740            return;
 741        }
 742        QTAILQ_REMOVE(&ring->unused, xfer, next);
 743        usb_host_iso_reset_xfer(xfer);
 744        QTAILQ_INSERT_TAIL(&ring->copy, xfer, next);
 745    }
 746    usb_host_iso_data_copy(xfer, p);
 747
 748    if (QTAILQ_EMPTY(&ring->inflight)) {
 749        /* wait until half of our buffers are filled
 750           before kicking the iso out stream */
 751        if (filled*2 < s->iso_urb_count) {
 752            return;
 753        }
 754    }
 755
 756    /* submit filled bufs to host */
 757    while ((xfer = QTAILQ_FIRST(&ring->copy)) != NULL &&
 758           xfer->copy_complete) {
 759        QTAILQ_REMOVE(&ring->copy, xfer, next);
 760        rc = libusb_submit_transfer(xfer->xfer);
 761        if (rc != 0) {
 762            usb_host_libusb_error("libusb_submit_transfer [iso]", rc);
 763            QTAILQ_INSERT_TAIL(&ring->unused, xfer, next);
 764            if (rc == LIBUSB_ERROR_NO_DEVICE) {
 765                disconnect = true;
 766            }
 767            break;
 768        }
 769        if (QTAILQ_EMPTY(&ring->inflight)) {
 770            trace_usb_host_iso_start(s->bus_num, s->addr, p->ep->nr);
 771        }
 772        QTAILQ_INSERT_TAIL(&ring->inflight, xfer, next);
 773    }
 774
 775    if (disconnect) {
 776        usb_host_nodev(s);
 777    }
 778}
 779
 780/* ------------------------------------------------------------------------ */
 781
 782static void usb_host_speed_compat(USBHostDevice *s)
 783{
 784    USBDevice *udev = USB_DEVICE(s);
 785    struct libusb_config_descriptor *conf;
 786    const struct libusb_interface_descriptor *intf;
 787    const struct libusb_endpoint_descriptor *endp;
 788#ifdef HAVE_STREAMS
 789    struct libusb_ss_endpoint_companion_descriptor *endp_ss_comp;
 790#endif
 791    bool compat_high = true;
 792    bool compat_full = true;
 793    uint8_t type;
 794    int rc, c, i, a, e;
 795
 796    for (c = 0;; c++) {
 797        rc = libusb_get_config_descriptor(s->dev, c, &conf);
 798        if (rc != 0) {
 799            break;
 800        }
 801        for (i = 0; i < conf->bNumInterfaces; i++) {
 802            for (a = 0; a < conf->interface[i].num_altsetting; a++) {
 803                intf = &conf->interface[i].altsetting[a];
 804
 805                if (intf->bInterfaceClass == LIBUSB_CLASS_MASS_STORAGE &&
 806                    intf->bInterfaceSubClass == 6) { /* SCSI */
 807                    udev->flags |= (1 << USB_DEV_FLAG_IS_SCSI_STORAGE);
 808                    break;
 809                }
 810
 811                for (e = 0; e < intf->bNumEndpoints; e++) {
 812                    endp = &intf->endpoint[e];
 813                    type = endp->bmAttributes & 0x3;
 814                    switch (type) {
 815                    case 0x01: /* ISO */
 816                        compat_full = false;
 817                        compat_high = false;
 818                        break;
 819                    case 0x02: /* BULK */
 820#ifdef HAVE_STREAMS
 821                        rc = libusb_get_ss_endpoint_companion_descriptor
 822                            (ctx, endp, &endp_ss_comp);
 823                        if (rc == LIBUSB_SUCCESS) {
 824                            int streams = endp_ss_comp->bmAttributes & 0x1f;
 825                            if (streams) {
 826                                compat_full = false;
 827                                compat_high = false;
 828                            }
 829                            libusb_free_ss_endpoint_companion_descriptor
 830                                (endp_ss_comp);
 831                        }
 832#endif
 833                        break;
 834                    case 0x03: /* INTERRUPT */
 835                        if (endp->wMaxPacketSize > 64) {
 836                            compat_full = false;
 837                        }
 838                        if (endp->wMaxPacketSize > 1024) {
 839                            compat_high = false;
 840                        }
 841                        break;
 842                    }
 843                }
 844            }
 845        }
 846        libusb_free_config_descriptor(conf);
 847    }
 848
 849    udev->speedmask = (1 << udev->speed);
 850    if (udev->speed == USB_SPEED_SUPER && compat_high) {
 851        udev->speedmask |= USB_SPEED_MASK_HIGH;
 852    }
 853    if (udev->speed == USB_SPEED_SUPER && compat_full) {
 854        udev->speedmask |= USB_SPEED_MASK_FULL;
 855    }
 856    if (udev->speed == USB_SPEED_HIGH && compat_full) {
 857        udev->speedmask |= USB_SPEED_MASK_FULL;
 858    }
 859}
 860
 861static void usb_host_ep_update(USBHostDevice *s)
 862{
 863    static const char *tname[] = {
 864        [USB_ENDPOINT_XFER_CONTROL] = "control",
 865        [USB_ENDPOINT_XFER_ISOC]    = "isoc",
 866        [USB_ENDPOINT_XFER_BULK]    = "bulk",
 867        [USB_ENDPOINT_XFER_INT]     = "int",
 868    };
 869    USBDevice *udev = USB_DEVICE(s);
 870    struct libusb_config_descriptor *conf;
 871    const struct libusb_interface_descriptor *intf;
 872    const struct libusb_endpoint_descriptor *endp;
 873#ifdef HAVE_STREAMS
 874    struct libusb_ss_endpoint_companion_descriptor *endp_ss_comp;
 875#endif
 876    uint8_t devep, type;
 877    int pid, ep, alt;
 878    int rc, i, e;
 879
 880    usb_ep_reset(udev);
 881    rc = libusb_get_active_config_descriptor(s->dev, &conf);
 882    if (rc != 0) {
 883        return;
 884    }
 885    trace_usb_host_parse_config(s->bus_num, s->addr,
 886                                conf->bConfigurationValue, true);
 887
 888    for (i = 0; i < conf->bNumInterfaces; i++) {
 889        /*
 890         * The udev->altsetting array indexes alternate settings
 891         * by the interface number. Get the 0th alternate setting
 892         * first so that we can grab the interface number, and
 893         * then correct the alternate setting value if necessary.
 894         */
 895        intf = &conf->interface[i].altsetting[0];
 896        alt = udev->altsetting[intf->bInterfaceNumber];
 897
 898        if (alt != 0) {
 899            assert(alt < conf->interface[i].num_altsetting);
 900            intf = &conf->interface[i].altsetting[alt];
 901        }
 902
 903        trace_usb_host_parse_interface(s->bus_num, s->addr,
 904                                       intf->bInterfaceNumber,
 905                                       intf->bAlternateSetting, true);
 906        for (e = 0; e < intf->bNumEndpoints; e++) {
 907            endp = &intf->endpoint[e];
 908
 909            devep = endp->bEndpointAddress;
 910            pid = (devep & USB_DIR_IN) ? USB_TOKEN_IN : USB_TOKEN_OUT;
 911            ep = devep & 0xf;
 912            type = endp->bmAttributes & 0x3;
 913
 914            if (ep == 0) {
 915                trace_usb_host_parse_error(s->bus_num, s->addr,
 916                                           "invalid endpoint address");
 917                return;
 918            }
 919            if (usb_ep_get_type(udev, pid, ep) != USB_ENDPOINT_XFER_INVALID) {
 920                trace_usb_host_parse_error(s->bus_num, s->addr,
 921                                           "duplicate endpoint address");
 922                return;
 923            }
 924
 925            trace_usb_host_parse_endpoint(s->bus_num, s->addr, ep,
 926                                          (devep & USB_DIR_IN) ? "in" : "out",
 927                                          tname[type], true);
 928            usb_ep_set_max_packet_size(udev, pid, ep,
 929                                       endp->wMaxPacketSize);
 930            usb_ep_set_type(udev, pid, ep, type);
 931            usb_ep_set_ifnum(udev, pid, ep, i);
 932            usb_ep_set_halted(udev, pid, ep, 0);
 933#ifdef HAVE_STREAMS
 934            if (type == LIBUSB_TRANSFER_TYPE_BULK &&
 935                    libusb_get_ss_endpoint_companion_descriptor(ctx, endp,
 936                        &endp_ss_comp) == LIBUSB_SUCCESS) {
 937                usb_ep_set_max_streams(udev, pid, ep,
 938                                       endp_ss_comp->bmAttributes);
 939                libusb_free_ss_endpoint_companion_descriptor(endp_ss_comp);
 940            }
 941#endif
 942        }
 943    }
 944
 945    libusb_free_config_descriptor(conf);
 946}
 947
 948static int usb_host_open(USBHostDevice *s, libusb_device *dev, int hostfd)
 949{
 950    USBDevice *udev = USB_DEVICE(s);
 951    int libusb_speed;
 952    int bus_num = 0;
 953    int addr = 0;
 954    int rc;
 955    Error *local_err = NULL;
 956
 957    if (s->bh_postld_pending) {
 958        return -1;
 959    }
 960    if (s->dh != NULL) {
 961        goto fail;
 962    }
 963
 964    if (dev) {
 965        bus_num = libusb_get_bus_number(dev);
 966        addr = libusb_get_device_address(dev);
 967        trace_usb_host_open_started(bus_num, addr);
 968
 969        rc = libusb_open(dev, &s->dh);
 970        if (rc != 0) {
 971            goto fail;
 972        }
 973    } else {
 974#if LIBUSB_API_VERSION >= 0x01000107 && !defined(CONFIG_WIN32)
 975        trace_usb_host_open_hostfd(hostfd);
 976
 977        rc = libusb_wrap_sys_device(ctx, hostfd, &s->dh);
 978        if (rc != 0) {
 979            goto fail;
 980        }
 981        s->hostfd  = hostfd;
 982        dev = libusb_get_device(s->dh);
 983        bus_num = libusb_get_bus_number(dev);
 984        addr = libusb_get_device_address(dev);
 985#else
 986        g_assert_not_reached();
 987#endif
 988    }
 989
 990    s->dev     = dev;
 991    s->bus_num = bus_num;
 992    s->addr    = addr;
 993
 994    usb_host_detach_kernel(s);
 995
 996    libusb_get_device_descriptor(dev, &s->ddesc);
 997    usb_host_get_port(s->dev, s->port, sizeof(s->port));
 998
 999    usb_ep_init(udev);
1000    usb_host_ep_update(s);
1001
1002    libusb_speed = libusb_get_device_speed(dev);
1003#if LIBUSB_API_VERSION >= 0x01000107 && defined(CONFIG_LINUX) && \
1004        defined(USBDEVFS_GET_SPEED)
1005    if (hostfd && libusb_speed == 0) {
1006        /*
1007         * Workaround libusb bug: libusb_get_device_speed() does not
1008         * work for libusb_wrap_sys_device() devices in v1.0.23.
1009         *
1010         * Speeds are defined in linux/usb/ch9.h, file not included
1011         * due to name conflicts.
1012         */
1013        int rc = ioctl(hostfd, USBDEVFS_GET_SPEED, NULL);
1014        switch (rc) {
1015        case 1: /* low */
1016            libusb_speed = LIBUSB_SPEED_LOW;
1017            break;
1018        case 2: /* full */
1019            libusb_speed = LIBUSB_SPEED_FULL;
1020            break;
1021        case 3: /* high */
1022        case 4: /* wireless */
1023            libusb_speed = LIBUSB_SPEED_HIGH;
1024            break;
1025        case 5: /* super */
1026            libusb_speed = LIBUSB_SPEED_SUPER;
1027            break;
1028        case 6: /* super plus */
1029#ifdef HAVE_SUPER_PLUS
1030            libusb_speed = LIBUSB_SPEED_SUPER_PLUS;
1031#else
1032            libusb_speed = LIBUSB_SPEED_SUPER;
1033#endif
1034            break;
1035        }
1036    }
1037#endif
1038    udev->speed = speed_map[libusb_speed];
1039    usb_host_speed_compat(s);
1040
1041    if (s->ddesc.iProduct) {
1042        libusb_get_string_descriptor_ascii(s->dh, s->ddesc.iProduct,
1043                                           (unsigned char *)udev->product_desc,
1044                                           sizeof(udev->product_desc));
1045    } else {
1046        snprintf(udev->product_desc, sizeof(udev->product_desc),
1047                 "host:%d.%d", bus_num, addr);
1048    }
1049
1050    usb_device_attach(udev, &local_err);
1051    if (local_err) {
1052        error_report_err(local_err);
1053        goto fail;
1054    }
1055
1056    trace_usb_host_open_success(bus_num, addr);
1057    return 0;
1058
1059fail:
1060    trace_usb_host_open_failure(bus_num, addr);
1061    if (s->dh != NULL) {
1062        usb_host_release_interfaces(s);
1063        libusb_reset_device(s->dh);
1064        usb_host_attach_kernel(s);
1065        libusb_close(s->dh);
1066        s->dh = NULL;
1067        s->dev = NULL;
1068    }
1069    return -1;
1070}
1071
1072static void usb_host_abort_xfers(USBHostDevice *s)
1073{
1074    USBHostRequest *r, *rtmp;
1075    int limit = 100;
1076
1077    QTAILQ_FOREACH_SAFE(r, &s->requests, next, rtmp) {
1078        usb_host_req_abort(r);
1079    }
1080
1081    while (QTAILQ_FIRST(&s->requests) != NULL) {
1082        struct timeval tv;
1083        memset(&tv, 0, sizeof(tv));
1084        tv.tv_usec = 2500;
1085        libusb_handle_events_timeout(ctx, &tv);
1086        if (--limit == 0) {
1087            /*
1088             * Don't wait forever for libusb calling the complete
1089             * callback (which will unlink and free the request).
1090             *
1091             * Leaking memory here, to make sure libusb will not
1092             * access memory which we have released already.
1093             */
1094            QTAILQ_FOREACH_SAFE(r, &s->requests, next, rtmp) {
1095                QTAILQ_REMOVE(&s->requests, r, next);
1096            }
1097            return;
1098        }
1099    }
1100}
1101
1102static int usb_host_close(USBHostDevice *s)
1103{
1104    USBDevice *udev = USB_DEVICE(s);
1105
1106    if (s->dh == NULL) {
1107        return -1;
1108    }
1109
1110    trace_usb_host_close(s->bus_num, s->addr);
1111
1112    usb_host_abort_xfers(s);
1113    usb_host_iso_free_all(s);
1114
1115    if (udev->attached) {
1116        usb_device_detach(udev);
1117    }
1118
1119    usb_host_release_interfaces(s);
1120    libusb_reset_device(s->dh);
1121    usb_host_attach_kernel(s);
1122    libusb_close(s->dh);
1123    s->dh = NULL;
1124    s->dev = NULL;
1125
1126    if (s->hostfd != -1) {
1127        close(s->hostfd);
1128        s->hostfd = -1;
1129    }
1130
1131    usb_host_auto_check(NULL);
1132    return 0;
1133}
1134
1135static void usb_host_nodev_bh(void *opaque)
1136{
1137    USBHostDevice *s = opaque;
1138    usb_host_close(s);
1139}
1140
1141static void usb_host_nodev(USBHostDevice *s)
1142{
1143    if (!s->bh_nodev) {
1144        s->bh_nodev = qemu_bh_new(usb_host_nodev_bh, s);
1145    }
1146    qemu_bh_schedule(s->bh_nodev);
1147}
1148
1149static void usb_host_exit_notifier(struct Notifier *n, void *data)
1150{
1151    USBHostDevice *s = container_of(n, USBHostDevice, exit);
1152
1153    if (s->dh) {
1154        usb_host_abort_xfers(s);
1155        usb_host_release_interfaces(s);
1156        libusb_reset_device(s->dh);
1157        usb_host_attach_kernel(s);
1158        libusb_close(s->dh);
1159    }
1160}
1161
1162static libusb_device *usb_host_find_ref(int bus, int addr)
1163{
1164    libusb_device **devs = NULL;
1165    libusb_device *ret = NULL;
1166    int i, n;
1167
1168    n = libusb_get_device_list(ctx, &devs);
1169    for (i = 0; i < n; i++) {
1170        if (libusb_get_bus_number(devs[i]) == bus &&
1171            libusb_get_device_address(devs[i]) == addr) {
1172            ret = libusb_ref_device(devs[i]);
1173            break;
1174        }
1175    }
1176    libusb_free_device_list(devs, 1);
1177    return ret;
1178}
1179
1180static void usb_host_realize(USBDevice *udev, Error **errp)
1181{
1182    USBHostDevice *s = USB_HOST_DEVICE(udev);
1183    libusb_device *ldev;
1184    int rc;
1185
1186    if (usb_host_init() != 0) {
1187        error_setg(errp, "failed to init libusb");
1188        return;
1189    }
1190    if (s->match.vendor_id > 0xffff) {
1191        error_setg(errp, "vendorid out of range");
1192        return;
1193    }
1194    if (s->match.product_id > 0xffff) {
1195        error_setg(errp, "productid out of range");
1196        return;
1197    }
1198    if (s->match.addr > 127) {
1199        error_setg(errp, "hostaddr out of range");
1200        return;
1201    }
1202
1203    loglevel = s->loglevel;
1204    udev->flags |= (1 << USB_DEV_FLAG_IS_HOST);
1205    udev->auto_attach = 0;
1206    QTAILQ_INIT(&s->requests);
1207    QTAILQ_INIT(&s->isorings);
1208    s->hostfd = -1;
1209
1210#if LIBUSB_API_VERSION >= 0x01000107 && !defined(CONFIG_WIN32)
1211    if (s->hostdevice) {
1212        int fd;
1213        s->needs_autoscan = false;
1214        fd = qemu_open_old(s->hostdevice, O_RDWR);
1215        if (fd < 0) {
1216            error_setg_errno(errp, errno, "failed to open %s", s->hostdevice);
1217            return;
1218        }
1219        rc = usb_host_open(s, NULL, fd);
1220        if (rc < 0) {
1221            error_setg(errp, "failed to open host usb device %s", s->hostdevice);
1222            return;
1223        }
1224    } else
1225#endif
1226    if (s->match.addr && s->match.bus_num &&
1227        !s->match.vendor_id &&
1228        !s->match.product_id &&
1229        !s->match.port) {
1230        s->needs_autoscan = false;
1231        ldev = usb_host_find_ref(s->match.bus_num,
1232                                 s->match.addr);
1233        if (!ldev) {
1234            error_setg(errp, "failed to find host usb device %d:%d",
1235                       s->match.bus_num, s->match.addr);
1236            return;
1237        }
1238        rc = usb_host_open(s, ldev, 0);
1239        libusb_unref_device(ldev);
1240        if (rc < 0) {
1241            error_setg(errp, "failed to open host usb device %d:%d",
1242                       s->match.bus_num, s->match.addr);
1243            return;
1244        }
1245    } else {
1246        s->needs_autoscan = true;
1247        QTAILQ_INSERT_TAIL(&hostdevs, s, next);
1248        usb_host_auto_check(NULL);
1249    }
1250
1251    s->exit.notify = usb_host_exit_notifier;
1252    qemu_add_exit_notifier(&s->exit);
1253}
1254
1255static void usb_host_instance_init(Object *obj)
1256{
1257    USBDevice *udev = USB_DEVICE(obj);
1258    USBHostDevice *s = USB_HOST_DEVICE(udev);
1259
1260    device_add_bootindex_property(obj, &s->bootindex,
1261                                  "bootindex", NULL,
1262                                  &udev->qdev);
1263}
1264
1265static void usb_host_unrealize(USBDevice *udev)
1266{
1267    USBHostDevice *s = USB_HOST_DEVICE(udev);
1268
1269    qemu_remove_exit_notifier(&s->exit);
1270    if (s->needs_autoscan) {
1271        QTAILQ_REMOVE(&hostdevs, s, next);
1272    }
1273    usb_host_close(s);
1274}
1275
1276static void usb_host_cancel_packet(USBDevice *udev, USBPacket *p)
1277{
1278    USBHostDevice *s = USB_HOST_DEVICE(udev);
1279    USBHostRequest *r;
1280
1281    if (p->combined) {
1282        usb_combined_packet_cancel(udev, p);
1283        return;
1284    }
1285
1286    trace_usb_host_req_canceled(s->bus_num, s->addr, p);
1287
1288    r = usb_host_req_find(s, p);
1289    if (r && r->p) {
1290        r->p = NULL; /* mark as dead */
1291        libusb_cancel_transfer(r->xfer);
1292    }
1293}
1294
1295static void usb_host_detach_kernel(USBHostDevice *s)
1296{
1297    struct libusb_config_descriptor *conf;
1298    int rc, i;
1299
1300    rc = libusb_get_active_config_descriptor(s->dev, &conf);
1301    if (rc != 0) {
1302        return;
1303    }
1304    for (i = 0; i < USB_MAX_INTERFACES; i++) {
1305        rc = libusb_kernel_driver_active(s->dh, i);
1306        usb_host_libusb_error("libusb_kernel_driver_active", rc);
1307        if (rc != 1) {
1308            if (rc == 0) {
1309                s->ifs[i].detached = true;
1310            }
1311            continue;
1312        }
1313        trace_usb_host_detach_kernel(s->bus_num, s->addr, i);
1314        rc = libusb_detach_kernel_driver(s->dh, i);
1315        usb_host_libusb_error("libusb_detach_kernel_driver", rc);
1316        s->ifs[i].detached = true;
1317    }
1318    libusb_free_config_descriptor(conf);
1319}
1320
1321static void usb_host_attach_kernel(USBHostDevice *s)
1322{
1323    struct libusb_config_descriptor *conf;
1324    int rc, i;
1325
1326    rc = libusb_get_active_config_descriptor(s->dev, &conf);
1327    if (rc != 0) {
1328        return;
1329    }
1330    for (i = 0; i < USB_MAX_INTERFACES; i++) {
1331        if (!s->ifs[i].detached) {
1332            continue;
1333        }
1334        trace_usb_host_attach_kernel(s->bus_num, s->addr, i);
1335        libusb_attach_kernel_driver(s->dh, i);
1336        s->ifs[i].detached = false;
1337    }
1338    libusb_free_config_descriptor(conf);
1339}
1340
1341static int usb_host_claim_interfaces(USBHostDevice *s, int configuration)
1342{
1343    USBDevice *udev = USB_DEVICE(s);
1344    struct libusb_config_descriptor *conf;
1345    int rc, i, claimed;
1346
1347    for (i = 0; i < USB_MAX_INTERFACES; i++) {
1348        udev->altsetting[i] = 0;
1349    }
1350    udev->ninterfaces   = 0;
1351    udev->configuration = 0;
1352
1353    usb_host_detach_kernel(s);
1354
1355    rc = libusb_get_active_config_descriptor(s->dev, &conf);
1356    if (rc != 0) {
1357        if (rc == LIBUSB_ERROR_NOT_FOUND) {
1358            /* address state - ignore */
1359            return USB_RET_SUCCESS;
1360        }
1361        return USB_RET_STALL;
1362    }
1363
1364    claimed = 0;
1365    for (i = 0; i < USB_MAX_INTERFACES; i++) {
1366        trace_usb_host_claim_interface(s->bus_num, s->addr, configuration, i);
1367        rc = libusb_claim_interface(s->dh, i);
1368        if (rc == 0) {
1369            s->ifs[i].claimed = true;
1370            if (++claimed == conf->bNumInterfaces) {
1371                break;
1372            }
1373        }
1374    }
1375    if (claimed != conf->bNumInterfaces) {
1376        return USB_RET_STALL;
1377    }
1378
1379    udev->ninterfaces   = conf->bNumInterfaces;
1380    udev->configuration = configuration;
1381
1382    libusb_free_config_descriptor(conf);
1383    return USB_RET_SUCCESS;
1384}
1385
1386static void usb_host_release_interfaces(USBHostDevice *s)
1387{
1388    int i, rc;
1389
1390    for (i = 0; i < USB_MAX_INTERFACES; i++) {
1391        if (!s->ifs[i].claimed) {
1392            continue;
1393        }
1394        trace_usb_host_release_interface(s->bus_num, s->addr, i);
1395        rc = libusb_release_interface(s->dh, i);
1396        usb_host_libusb_error("libusb_release_interface", rc);
1397        s->ifs[i].claimed = false;
1398    }
1399}
1400
1401static void usb_host_set_address(USBHostDevice *s, int addr)
1402{
1403    USBDevice *udev = USB_DEVICE(s);
1404
1405    trace_usb_host_set_address(s->bus_num, s->addr, addr);
1406    udev->addr = addr;
1407}
1408
1409static void usb_host_set_config(USBHostDevice *s, int config, USBPacket *p)
1410{
1411    int rc = 0;
1412
1413    trace_usb_host_set_config(s->bus_num, s->addr, config);
1414
1415    usb_host_release_interfaces(s);
1416    if (s->ddesc.bNumConfigurations != 1) {
1417        rc = libusb_set_configuration(s->dh, config);
1418        if (rc != 0) {
1419            usb_host_libusb_error("libusb_set_configuration", rc);
1420            p->status = USB_RET_STALL;
1421            if (rc == LIBUSB_ERROR_NO_DEVICE) {
1422                usb_host_nodev(s);
1423            }
1424            return;
1425        }
1426    }
1427    p->status = usb_host_claim_interfaces(s, config);
1428    if (p->status != USB_RET_SUCCESS) {
1429        return;
1430    }
1431    usb_host_ep_update(s);
1432}
1433
1434static void usb_host_set_interface(USBHostDevice *s, int iface, int alt,
1435                                   USBPacket *p)
1436{
1437    USBDevice *udev = USB_DEVICE(s);
1438    int rc;
1439
1440    trace_usb_host_set_interface(s->bus_num, s->addr, iface, alt);
1441
1442    usb_host_iso_free_all(s);
1443
1444    if (iface >= USB_MAX_INTERFACES) {
1445        p->status = USB_RET_STALL;
1446        return;
1447    }
1448
1449    rc = libusb_set_interface_alt_setting(s->dh, iface, alt);
1450    if (rc != 0) {
1451        usb_host_libusb_error("libusb_set_interface_alt_setting", rc);
1452        p->status = USB_RET_STALL;
1453        if (rc == LIBUSB_ERROR_NO_DEVICE) {
1454            usb_host_nodev(s);
1455        }
1456        return;
1457    }
1458
1459    udev->altsetting[iface] = alt;
1460    usb_host_ep_update(s);
1461}
1462
1463static void usb_host_handle_control(USBDevice *udev, USBPacket *p,
1464                                    int request, int value, int index,
1465                                    int length, uint8_t *data)
1466{
1467    USBHostDevice *s = USB_HOST_DEVICE(udev);
1468    USBHostRequest *r;
1469    int rc;
1470
1471    trace_usb_host_req_control(s->bus_num, s->addr, p, request, value, index);
1472
1473    if (s->dh == NULL) {
1474        p->status = USB_RET_NODEV;
1475        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
1476        return;
1477    }
1478
1479    switch (request) {
1480    case DeviceOutRequest | USB_REQ_SET_ADDRESS:
1481        usb_host_set_address(s, value);
1482        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
1483        return;
1484
1485    case DeviceOutRequest | USB_REQ_SET_CONFIGURATION:
1486        usb_host_set_config(s, value & 0xff, p);
1487        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
1488        return;
1489
1490    case InterfaceOutRequest | USB_REQ_SET_INTERFACE:
1491        usb_host_set_interface(s, index, value, p);
1492        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
1493        return;
1494
1495    case EndpointOutRequest | USB_REQ_CLEAR_FEATURE:
1496        if (value == 0) { /* clear halt */
1497            int pid = (index & USB_DIR_IN) ? USB_TOKEN_IN : USB_TOKEN_OUT;
1498            libusb_clear_halt(s->dh, index);
1499            usb_ep_set_halted(udev, pid, index & 0x0f, 0);
1500            trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
1501            return;
1502        }
1503    }
1504
1505    r = usb_host_req_alloc(s, p, (request >> 8) & USB_DIR_IN, length + 8);
1506    r->cbuf = data;
1507    r->clen = length;
1508    memcpy(r->buffer, udev->setup_buf, 8);
1509    if (!r->in) {
1510        memcpy(r->buffer + 8, r->cbuf, r->clen);
1511    }
1512
1513    /* Fix up USB-3 ep0 maxpacket size to allow superspeed connected devices
1514     * to work redirected to a not superspeed capable hcd */
1515    if ((udev->speedmask & USB_SPEED_MASK_SUPER) &&
1516        !(udev->port->speedmask & USB_SPEED_MASK_SUPER) &&
1517        request == 0x8006 && value == 0x100 && index == 0) {
1518        r->usb3ep0quirk = true;
1519    }
1520
1521    libusb_fill_control_transfer(r->xfer, s->dh, r->buffer,
1522                                 usb_host_req_complete_ctrl, r,
1523                                 CONTROL_TIMEOUT);
1524    rc = libusb_submit_transfer(r->xfer);
1525    if (rc != 0) {
1526        p->status = USB_RET_NODEV;
1527        trace_usb_host_req_complete(s->bus_num, s->addr, p,
1528                                    p->status, p->actual_length);
1529        if (rc == LIBUSB_ERROR_NO_DEVICE) {
1530            usb_host_nodev(s);
1531        }
1532        return;
1533    }
1534
1535    p->status = USB_RET_ASYNC;
1536}
1537
1538static void usb_host_handle_data(USBDevice *udev, USBPacket *p)
1539{
1540    USBHostDevice *s = USB_HOST_DEVICE(udev);
1541    USBHostRequest *r;
1542    size_t size;
1543    int ep, rc;
1544
1545    if (usb_host_use_combining(p->ep) && p->state == USB_PACKET_SETUP) {
1546        p->status = USB_RET_ADD_TO_QUEUE;
1547        return;
1548    }
1549
1550    trace_usb_host_req_data(s->bus_num, s->addr, p,
1551                            p->pid == USB_TOKEN_IN,
1552                            p->ep->nr, p->iov.size);
1553
1554    if (s->dh == NULL) {
1555        p->status = USB_RET_NODEV;
1556        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
1557        return;
1558    }
1559    if (p->ep->halted) {
1560        p->status = USB_RET_STALL;
1561        trace_usb_host_req_emulated(s->bus_num, s->addr, p, p->status);
1562        return;
1563    }
1564
1565    switch (usb_ep_get_type(udev, p->pid, p->ep->nr)) {
1566    case USB_ENDPOINT_XFER_BULK:
1567        size = usb_packet_size(p);
1568        r = usb_host_req_alloc(s, p, p->pid == USB_TOKEN_IN, size);
1569        if (!r->in) {
1570            usb_packet_copy(p, r->buffer, size);
1571        }
1572        ep = p->ep->nr | (r->in ? USB_DIR_IN : 0);
1573        if (p->stream) {
1574#ifdef HAVE_STREAMS
1575            libusb_fill_bulk_stream_transfer(r->xfer, s->dh, ep, p->stream,
1576                                             r->buffer, size,
1577                                             usb_host_req_complete_data, r,
1578                                             BULK_TIMEOUT);
1579#else
1580            usb_host_req_free(r);
1581            p->status = USB_RET_STALL;
1582            return;
1583#endif
1584        } else {
1585            libusb_fill_bulk_transfer(r->xfer, s->dh, ep,
1586                                      r->buffer, size,
1587                                      usb_host_req_complete_data, r,
1588                                      BULK_TIMEOUT);
1589        }
1590        break;
1591    case USB_ENDPOINT_XFER_INT:
1592        r = usb_host_req_alloc(s, p, p->pid == USB_TOKEN_IN, p->iov.size);
1593        if (!r->in) {
1594            usb_packet_copy(p, r->buffer, p->iov.size);
1595        }
1596        ep = p->ep->nr | (r->in ? USB_DIR_IN : 0);
1597        libusb_fill_interrupt_transfer(r->xfer, s->dh, ep,
1598                                       r->buffer, p->iov.size,
1599                                       usb_host_req_complete_data, r,
1600                                       INTR_TIMEOUT);
1601        break;
1602    case USB_ENDPOINT_XFER_ISOC:
1603        if (p->pid == USB_TOKEN_IN) {
1604            usb_host_iso_data_in(s, p);
1605        } else {
1606            usb_host_iso_data_out(s, p);
1607        }
1608        trace_usb_host_req_complete(s->bus_num, s->addr, p,
1609                                    p->status, p->actual_length);
1610        return;
1611    default:
1612        p->status = USB_RET_STALL;
1613        trace_usb_host_req_complete(s->bus_num, s->addr, p,
1614                                    p->status, p->actual_length);
1615        return;
1616    }
1617
1618    rc = libusb_submit_transfer(r->xfer);
1619    if (rc != 0) {
1620        p->status = USB_RET_NODEV;
1621        trace_usb_host_req_complete(s->bus_num, s->addr, p,
1622                                    p->status, p->actual_length);
1623        if (rc == LIBUSB_ERROR_NO_DEVICE) {
1624            usb_host_nodev(s);
1625        }
1626        return;
1627    }
1628
1629    p->status = USB_RET_ASYNC;
1630}
1631
1632static void usb_host_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
1633{
1634    if (usb_host_use_combining(ep)) {
1635        usb_ep_combine_input_packets(ep);
1636    }
1637}
1638
1639static void usb_host_handle_reset(USBDevice *udev)
1640{
1641    USBHostDevice *s = USB_HOST_DEVICE(udev);
1642    int rc;
1643
1644    if (!s->allow_one_guest_reset && !s->allow_all_guest_resets) {
1645        return;
1646    }
1647    if (!s->allow_all_guest_resets && udev->addr == 0) {
1648        return;
1649    }
1650
1651    trace_usb_host_reset(s->bus_num, s->addr);
1652
1653    rc = libusb_reset_device(s->dh);
1654    if (rc != 0) {
1655        usb_host_nodev(s);
1656    }
1657}
1658
1659static int usb_host_alloc_streams(USBDevice *udev, USBEndpoint **eps,
1660                                  int nr_eps, int streams)
1661{
1662#ifdef HAVE_STREAMS
1663    USBHostDevice *s = USB_HOST_DEVICE(udev);
1664    unsigned char endpoints[30];
1665    int i, rc;
1666
1667    for (i = 0; i < nr_eps; i++) {
1668        endpoints[i] = eps[i]->nr;
1669        if (eps[i]->pid == USB_TOKEN_IN) {
1670            endpoints[i] |= 0x80;
1671        }
1672    }
1673    rc = libusb_alloc_streams(s->dh, streams, endpoints, nr_eps);
1674    if (rc < 0) {
1675        usb_host_libusb_error("libusb_alloc_streams", rc);
1676    } else if (rc != streams) {
1677        error_report("libusb_alloc_streams: got less streams "
1678                     "then requested %d < %d", rc, streams);
1679    }
1680
1681    return (rc == streams) ? 0 : -1;
1682#else
1683    error_report("libusb_alloc_streams: error not implemented");
1684    return -1;
1685#endif
1686}
1687
1688static void usb_host_free_streams(USBDevice *udev, USBEndpoint **eps,
1689                                  int nr_eps)
1690{
1691#ifdef HAVE_STREAMS
1692    USBHostDevice *s = USB_HOST_DEVICE(udev);
1693    unsigned char endpoints[30];
1694    int i;
1695
1696    for (i = 0; i < nr_eps; i++) {
1697        endpoints[i] = eps[i]->nr;
1698        if (eps[i]->pid == USB_TOKEN_IN) {
1699            endpoints[i] |= 0x80;
1700        }
1701    }
1702    libusb_free_streams(s->dh, endpoints, nr_eps);
1703#endif
1704}
1705
1706/*
1707 * This is *NOT* about restoring state.  We have absolutely no idea
1708 * what state the host device is in at the moment and whenever it is
1709 * still present in the first place.  Attempting to continue where we
1710 * left off is impossible.
1711 *
1712 * What we are going to do here is emulate a surprise removal of
1713 * the usb device passed through, then kick host scan so the device
1714 * will get re-attached (and re-initialized by the guest) in case it
1715 * is still present.
1716 *
1717 * As the device removal will change the state of other devices (usb
1718 * host controller, most likely interrupt controller too) we have to
1719 * wait with it until *all* vmstate is loaded.  Thus post_load just
1720 * kicks a bottom half which then does the actual work.
1721 */
1722static void usb_host_post_load_bh(void *opaque)
1723{
1724    USBHostDevice *dev = opaque;
1725    USBDevice *udev = USB_DEVICE(dev);
1726
1727    if (dev->dh != NULL) {
1728        usb_host_close(dev);
1729    }
1730    if (udev->attached) {
1731        usb_device_detach(udev);
1732    }
1733    dev->bh_postld_pending = false;
1734    usb_host_auto_check(NULL);
1735}
1736
1737static int usb_host_post_load(void *opaque, int version_id)
1738{
1739    USBHostDevice *dev = opaque;
1740
1741    if (!dev->bh_postld) {
1742        dev->bh_postld = qemu_bh_new(usb_host_post_load_bh, dev);
1743    }
1744    qemu_bh_schedule(dev->bh_postld);
1745    dev->bh_postld_pending = true;
1746    return 0;
1747}
1748
1749static const VMStateDescription vmstate_usb_host = {
1750    .name = "usb-host",
1751    .version_id = 1,
1752    .minimum_version_id = 1,
1753    .post_load = usb_host_post_load,
1754    .fields = (VMStateField[]) {
1755        VMSTATE_USB_DEVICE(parent_obj, USBHostDevice),
1756        VMSTATE_END_OF_LIST()
1757    }
1758};
1759
1760static Property usb_host_dev_properties[] = {
1761    DEFINE_PROP_UINT32("hostbus",  USBHostDevice, match.bus_num,    0),
1762    DEFINE_PROP_UINT32("hostaddr", USBHostDevice, match.addr,       0),
1763    DEFINE_PROP_STRING("hostport", USBHostDevice, match.port),
1764    DEFINE_PROP_UINT32("vendorid",  USBHostDevice, match.vendor_id,  0),
1765    DEFINE_PROP_UINT32("productid", USBHostDevice, match.product_id, 0),
1766#if LIBUSB_API_VERSION >= 0x01000107
1767    DEFINE_PROP_STRING("hostdevice", USBHostDevice, hostdevice),
1768#endif
1769    DEFINE_PROP_UINT32("isobufs",  USBHostDevice, iso_urb_count,    4),
1770    DEFINE_PROP_UINT32("isobsize", USBHostDevice, iso_urb_frames,   32),
1771    DEFINE_PROP_BOOL("guest-reset", USBHostDevice,
1772                     allow_one_guest_reset, true),
1773    DEFINE_PROP_BOOL("guest-resets-all", USBHostDevice,
1774                     allow_all_guest_resets, false),
1775    DEFINE_PROP_UINT32("loglevel",  USBHostDevice, loglevel,
1776                       LIBUSB_LOG_LEVEL_WARNING),
1777    DEFINE_PROP_BIT("pipeline",    USBHostDevice, options,
1778                    USB_HOST_OPT_PIPELINE, true),
1779    DEFINE_PROP_BOOL("suppress-remote-wake", USBHostDevice,
1780                     suppress_remote_wake, true),
1781    DEFINE_PROP_END_OF_LIST(),
1782};
1783
1784static void usb_host_class_initfn(ObjectClass *klass, void *data)
1785{
1786    DeviceClass *dc = DEVICE_CLASS(klass);
1787    USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
1788
1789    uc->realize        = usb_host_realize;
1790    uc->product_desc   = "USB Host Device";
1791    uc->cancel_packet  = usb_host_cancel_packet;
1792    uc->handle_data    = usb_host_handle_data;
1793    uc->handle_control = usb_host_handle_control;
1794    uc->handle_reset   = usb_host_handle_reset;
1795    uc->unrealize      = usb_host_unrealize;
1796    uc->flush_ep_queue = usb_host_flush_ep_queue;
1797    uc->alloc_streams  = usb_host_alloc_streams;
1798    uc->free_streams   = usb_host_free_streams;
1799    dc->vmsd = &vmstate_usb_host;
1800    device_class_set_props(dc, usb_host_dev_properties);
1801    set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories);
1802}
1803
1804static const TypeInfo usb_host_dev_info = {
1805    .name          = TYPE_USB_HOST_DEVICE,
1806    .parent        = TYPE_USB_DEVICE,
1807    .instance_size = sizeof(USBHostDevice),
1808    .class_init    = usb_host_class_initfn,
1809    .instance_init = usb_host_instance_init,
1810};
1811module_obj(TYPE_USB_HOST_DEVICE);
1812module_kconfig(USB);
1813
1814static void usb_host_register_types(void)
1815{
1816    type_register_static(&usb_host_dev_info);
1817    monitor_register_hmp("usbhost", true, hmp_info_usbhost);
1818}
1819
1820type_init(usb_host_register_types)
1821
1822/* ------------------------------------------------------------------------ */
1823
1824static QEMUTimer *usb_auto_timer;
1825static VMChangeStateEntry *usb_vmstate;
1826
1827static void usb_host_vm_state(void *unused, bool running, RunState state)
1828{
1829    if (running) {
1830        usb_host_auto_check(unused);
1831    }
1832}
1833
1834static void usb_host_auto_check(void *unused)
1835{
1836    struct USBHostDevice *s;
1837    struct USBAutoFilter *f;
1838    libusb_device **devs = NULL;
1839    struct libusb_device_descriptor ddesc;
1840    int i, n;
1841
1842    if (usb_host_init() != 0) {
1843        return;
1844    }
1845
1846    if (runstate_is_running()) {
1847        n = libusb_get_device_list(ctx, &devs);
1848        for (i = 0; i < n; i++) {
1849            if (libusb_get_device_descriptor(devs[i], &ddesc) != 0) {
1850                continue;
1851            }
1852            if (ddesc.bDeviceClass == LIBUSB_CLASS_HUB) {
1853                continue;
1854            }
1855            QTAILQ_FOREACH(s, &hostdevs, next) {
1856                f = &s->match;
1857                if (f->bus_num > 0 &&
1858                    f->bus_num != libusb_get_bus_number(devs[i])) {
1859                    continue;
1860                }
1861                if (f->addr > 0 &&
1862                    f->addr != libusb_get_device_address(devs[i])) {
1863                    continue;
1864                }
1865                if (f->port != NULL) {
1866                    char port[16] = "-";
1867                    usb_host_get_port(devs[i], port, sizeof(port));
1868                    if (strcmp(f->port, port) != 0) {
1869                        continue;
1870                    }
1871                }
1872                if (f->vendor_id > 0 &&
1873                    f->vendor_id != ddesc.idVendor) {
1874                    continue;
1875                }
1876                if (f->product_id > 0 &&
1877                    f->product_id != ddesc.idProduct) {
1878                    continue;
1879                }
1880
1881                /* We got a match */
1882                s->seen++;
1883                if (s->errcount >= 3) {
1884                    continue;
1885                }
1886                if (s->dh != NULL) {
1887                    continue;
1888                }
1889                if (usb_host_open(s, devs[i], 0) < 0) {
1890                    s->errcount++;
1891                    continue;
1892                }
1893                break;
1894            }
1895        }
1896        libusb_free_device_list(devs, 1);
1897
1898        QTAILQ_FOREACH(s, &hostdevs, next) {
1899            if (s->seen == 0) {
1900                if (s->dh) {
1901                    usb_host_close(s);
1902                }
1903                s->errcount = 0;
1904            }
1905            s->seen = 0;
1906        }
1907    }
1908
1909    if (!usb_vmstate) {
1910        usb_vmstate = qemu_add_vm_change_state_handler(usb_host_vm_state, NULL);
1911    }
1912    if (!usb_auto_timer) {
1913        usb_auto_timer = timer_new_ms(QEMU_CLOCK_REALTIME, usb_host_auto_check, NULL);
1914        if (!usb_auto_timer) {
1915            return;
1916        }
1917        trace_usb_host_auto_scan_enabled();
1918    }
1919    timer_mod(usb_auto_timer, qemu_clock_get_ms(QEMU_CLOCK_REALTIME) + 2000);
1920}
1921
1922void hmp_info_usbhost(Monitor *mon, const QDict *qdict)
1923{
1924    libusb_device **devs = NULL;
1925    struct libusb_device_descriptor ddesc;
1926    char port[16];
1927    int i, n;
1928
1929    if (usb_host_init() != 0) {
1930        return;
1931    }
1932
1933    n = libusb_get_device_list(ctx, &devs);
1934    for (i = 0; i < n; i++) {
1935        if (libusb_get_device_descriptor(devs[i], &ddesc) != 0) {
1936            continue;
1937        }
1938        if (ddesc.bDeviceClass == LIBUSB_CLASS_HUB) {
1939            continue;
1940        }
1941        usb_host_get_port(devs[i], port, sizeof(port));
1942        monitor_printf(mon, "  Bus %d, Addr %d, Port %s, Speed %s Mb/s\n",
1943                       libusb_get_bus_number(devs[i]),
1944                       libusb_get_device_address(devs[i]),
1945                       port,
1946                       speed_name[libusb_get_device_speed(devs[i])]);
1947        monitor_printf(mon, "    Class %02x:", ddesc.bDeviceClass);
1948        monitor_printf(mon, " USB device %04x:%04x",
1949                       ddesc.idVendor, ddesc.idProduct);
1950        if (ddesc.iProduct) {
1951            libusb_device_handle *handle;
1952            if (libusb_open(devs[i], &handle) == 0) {
1953                unsigned char name[64] = "";
1954                libusb_get_string_descriptor_ascii(handle,
1955                                                   ddesc.iProduct,
1956                                                   name, sizeof(name));
1957                libusb_close(handle);
1958                monitor_printf(mon, ", %s", name);
1959            }
1960        }
1961        monitor_printf(mon, "\n");
1962    }
1963    libusb_free_device_list(devs, 1);
1964}
1965