sys/dev/usb/usb_transfer.c

   1 /* $FreeBSD$ */
   2 /*-
   3  * Copyright (c) 2008 Hans Petter Selasky. All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/stdint.h>
  28 #include <sys/stddef.h>
  29 #include <sys/param.h>
  30 #include <sys/queue.h>
  31 #include <sys/types.h>
  32 #include <sys/systm.h>
  33 #include <sys/kernel.h>
  34 #include <sys/bus.h>
  35 #include <sys/module.h>
  36 #include <sys/lock.h>
  37 #include <sys/mutex.h>
  38 #include <sys/condvar.h>
  39 #include <sys/sysctl.h>
  40 #include <sys/sx.h>
  41 #include <sys/unistd.h>
  42 #include <sys/callout.h>
  43 #include <sys/malloc.h>
  44 #include <sys/priv.h>
  45 #include <sys/proc.h>
  46
  47 #include <dev/usb/usb.h>
  48 #include <dev/usb/usbdi.h>
  49 #include <dev/usb/usbdi_util.h>
  50
  51 #define USB_DEBUG_VAR usb_debug
  52
  53 #include <dev/usb/usb_core.h>
  54 #include <dev/usb/usb_busdma.h>
  55 #include <dev/usb/usb_process.h>
  56 #include <dev/usb/usb_transfer.h>
  57 #include <dev/usb/usb_device.h>
  58 #include <dev/usb/usb_debug.h>
  59 #include <dev/usb/usb_util.h>
  60
  61 #include <dev/usb/usb_controller.h>
  62 #include <dev/usb/usb_bus.h>
  63 #include <dev/usb/usb_pf.h>
  64
  65 struct usb_std_packet_size {
  66         struct {
  67                 uint16_t min;           /* inclusive */
  68                 uint16_t max;           /* inclusive */
  69         }       range;
  70
  71         uint16_t fixed[4];
  72 };
  73
  74 static usb_callback_t usb_request_callback;
  75
  76 static const struct usb_config usb_control_ep_cfg[USB_CTRL_XFER_MAX] = {
  77
  78         /* This transfer is used for generic control endpoint transfers */
  79
  80         [0] = {
  81                 .type = UE_CONTROL,
  82                 .endpoint = 0x00,       /* Control endpoint */
  83                 .direction = UE_DIR_ANY,
  84                 .bufsize = USB_EP0_BUFSIZE,     /* bytes */
  85                 .flags = {.proxy_buffer = 1,},
  86                 .callback = &usb_request_callback,
  87                 .usb_mode = USB_MODE_DUAL,      /* both modes */
  88         },
  89
  90         /* This transfer is used for generic clear stall only */
  91
  92         [1] = {
  93                 .type = UE_CONTROL,
  94                 .endpoint = 0x00,       /* Control pipe */
  95                 .direction = UE_DIR_ANY,
  96                 .bufsize = sizeof(struct usb_device_request),
  97                 .callback = &usb_do_clear_stall_callback,
  98                 .timeout = 1000,        /* 1 second */
  99                 .interval = 50, /* 50ms */
 100                 .usb_mode = USB_MODE_HOST,
 101         },
 102 };
 103
 104 /* function prototypes */
 105
 106 static void     usbd_update_max_frame_size(struct usb_xfer *);
 107 static void     usbd_transfer_unsetup_sub(struct usb_xfer_root *, uint8_t);
 108 static void     usbd_control_transfer_init(struct usb_xfer *);
 109 static int      usbd_setup_ctrl_transfer(struct usb_xfer *);
 110 static void     usb_callback_proc(struct usb_proc_msg *);
 111 static void     usbd_callback_ss_done_defer(struct usb_xfer *);
 112 static void     usbd_callback_wrapper(struct usb_xfer_queue *);
 113 static void     usbd_transfer_start_cb(void *);
 114 static uint8_t  usbd_callback_wrapper_sub(struct usb_xfer *);
 115 static void     usbd_get_std_packet_size(struct usb_std_packet_size *ptr,
 116                     uint8_t type, enum usb_dev_speed speed);
 117
 118 /*------------------------------------------------------------------------*
 119  *      usb_request_callback
 120  *------------------------------------------------------------------------*/
 121 static void
 122 usb_request_callback(struct usb_xfer *xfer, usb_error_t error)
 123 {
 124         if (xfer->flags_int.usb_mode == USB_MODE_DEVICE)
 125                 usb_handle_request_callback(xfer, error);
 126         else
 127                 usbd_do_request_callback(xfer, error);
 128 }
 129
 130 /*------------------------------------------------------------------------*
 131  *      usbd_update_max_frame_size
 132  *
 133  * This function updates the maximum frame size, hence high speed USB
 134  * can transfer multiple consecutive packets.
 135  *------------------------------------------------------------------------*/
 136 static void
 137 usbd_update_max_frame_size(struct usb_xfer *xfer)
 138 {
 139         /* compute maximum frame size */
 140         /* this computation should not overflow 16-bit */
 141         /* max = 15 * 1024 */
 142
 143         xfer->max_frame_size = xfer->max_packet_size * xfer->max_packet_count;
 144 }
 145
 146 /*------------------------------------------------------------------------*
 147  *      usbd_get_dma_delay
 148  *
 149  * The following function is called when we need to
 150  * synchronize with DMA hardware.
 151  *
 152  * Returns:
 153  *    0: no DMA delay required
 154  * Else: milliseconds of DMA delay
 155  *------------------------------------------------------------------------*/
 156 usb_timeout_t
 157 usbd_get_dma_delay(struct usb_device *udev)
 158 {
 159         struct usb_bus_methods *mtod;
 160         uint32_t temp;
 161
 162         mtod = udev->bus->methods;
 163         temp = 0;
 164
 165         if (mtod->get_dma_delay) {
 166                 (mtod->get_dma_delay) (udev, &temp);
 167                 /*
 168                  * Round up and convert to milliseconds. Note that we use
 169                  * 1024 milliseconds per second. to save a division.
 170                  */
 171                 temp += 0x3FF;
 172                 temp /= 0x400;
 173         }
 174         return (temp);
 175 }
 176
 177 /*------------------------------------------------------------------------*
 178  *      usbd_transfer_setup_sub_malloc
 179  *
 180  * This function will allocate one or more DMA'able memory chunks
 181  * according to "size", "align" and "count" arguments. "ppc" is
 182  * pointed to a linear array of USB page caches afterwards.
 183  *
 184  * Returns:
 185  *    0: Success
 186  * Else: Failure
 187  *------------------------------------------------------------------------*/
 188 #if USB_HAVE_BUSDMA
 189 uint8_t
 190 usbd_transfer_setup_sub_malloc(struct usb_setup_params *parm,
 191     struct usb_page_cache **ppc, usb_size_t size, usb_size_t align,
 192     usb_size_t count)
 193 {
 194         struct usb_page_cache *pc;
 195         struct usb_page *pg;
 196         void *buf;
 197         usb_size_t n_dma_pc;
 198         usb_size_t n_obj;
 199         usb_size_t x;
 200         usb_size_t y;
 201         usb_size_t r;
 202         usb_size_t z;
 203
 204         USB_ASSERT(align > 1, ("Invalid alignment, 0x%08x\n",
 205             align));
 206         USB_ASSERT(size > 0, ("Invalid size = 0\n"));
 207
 208         if (count == 0) {
 209                 return (0);             /* nothing to allocate */
 210         }
 211         /*
 212          * Make sure that the size is aligned properly.
 213          */
 214         size = -((-size) & (-align));
 215
 216         /*
 217          * Try multi-allocation chunks to reduce the number of DMA
 218          * allocations, hence DMA allocations are slow.
 219          */
 220         if (size >= USB_PAGE_SIZE) {
 221                 n_dma_pc = count;
 222                 n_obj = 1;
 223         } else {
 224                 /* compute number of objects per page */
 225                 n_obj = (USB_PAGE_SIZE / size);
 226                 /*
 227                  * Compute number of DMA chunks, rounded up
 228                  * to nearest one:
 229                  */
 230                 n_dma_pc = ((count + n_obj - 1) / n_obj);
 231         }
 232
 233         if (parm->buf == NULL) {
 234                 /* for the future */
 235                 parm->dma_page_ptr += n_dma_pc;
 236                 parm->dma_page_cache_ptr += n_dma_pc;
 237                 parm->dma_page_ptr += count;
 238                 parm->xfer_page_cache_ptr += count;
 239                 return (0);
 240         }
 241         for (x = 0; x != n_dma_pc; x++) {
 242                 /* need to initialize the page cache */
 243                 parm->dma_page_cache_ptr[x].tag_parent =
 244                     &parm->curr_xfer->xroot->dma_parent_tag;
 245         }
 246         for (x = 0; x != count; x++) {
 247                 /* need to initialize the page cache */
 248                 parm->xfer_page_cache_ptr[x].tag_parent =
 249                     &parm->curr_xfer->xroot->dma_parent_tag;
 250         }
 251
 252         if (ppc) {
 253                 *ppc = parm->xfer_page_cache_ptr;
 254         }
 255         r = count;                      /* set remainder count */
 256         z = n_obj * size;               /* set allocation size */
 257         pc = parm->xfer_page_cache_ptr;
 258         pg = parm->dma_page_ptr;
 259
 260         for (x = 0; x != n_dma_pc; x++) {
 261
 262                 if (r < n_obj) {
 263                         /* compute last remainder */
 264                         z = r * size;
 265                         n_obj = r;
 266                 }
 267                 if (usb_pc_alloc_mem(parm->dma_page_cache_ptr,
 268                     pg, z, align)) {
 269                         return (1);     /* failure */
 270                 }
 271                 /* Set beginning of current buffer */
 272                 buf = parm->dma_page_cache_ptr->buffer;
 273                 /* Make room for one DMA page cache and one page */
 274                 parm->dma_page_cache_ptr++;
 275                 pg++;
 276
 277                 for (y = 0; (y != n_obj); y++, r--, pc++, pg++) {
 278
 279                         /* Load sub-chunk into DMA */
 280                         if (usb_pc_dmamap_create(pc, size)) {
 281                                 return (1);     /* failure */
 282                         }
 283                         pc->buffer = USB_ADD_BYTES(buf, y * size);
 284                         pc->page_start = pg;
 285
 286                         mtx_lock(pc->tag_parent->mtx);
 287                         if (usb_pc_load_mem(pc, size, 1 /* synchronous */ )) {
 288                                 mtx_unlock(pc->tag_parent->mtx);
 289                                 return (1);     /* failure */
 290                         }
 291                         mtx_unlock(pc->tag_parent->mtx);
 292                 }
 293         }
 294
 295         parm->xfer_page_cache_ptr = pc;
 296         parm->dma_page_ptr = pg;
 297         return (0);
 298 }
 299 #endif
 300
 301 /*------------------------------------------------------------------------*
 302  *      usbd_transfer_setup_sub - transfer setup subroutine
 303  *
 304  * This function must be called from the "xfer_setup" callback of the
 305  * USB Host or Device controller driver when setting up an USB
 306  * transfer. This function will setup correct packet sizes, buffer
 307  * sizes, flags and more, that are stored in the "usb_xfer"
 308  * structure.
 309  *------------------------------------------------------------------------*/
 310 void
 311 usbd_transfer_setup_sub(struct usb_setup_params *parm)
 312 {
 313         enum {
 314                 REQ_SIZE = 8,
 315                 MIN_PKT = 8,
 316         };
 317         struct usb_xfer *xfer = parm->curr_xfer;
 318         const struct usb_config *setup = parm->curr_setup;
 319         struct usb_endpoint_ss_comp_descriptor *ecomp;
 320         struct usb_endpoint_descriptor *edesc;
 321         struct usb_std_packet_size std_size;
 322         usb_frcount_t n_frlengths;
 323         usb_frcount_t n_frbuffers;
 324         usb_frcount_t x;
 325         uint8_t type;
 326         uint8_t zmps;
 327
 328         /*
 329          * Sanity check. The following parameters must be initialized before
 330          * calling this function.
 331          */
 332         if ((parm->hc_max_packet_size == 0) ||
 333             (parm->hc_max_packet_count == 0) ||
 334             (parm->hc_max_frame_size == 0)) {
 335                 parm->err = USB_ERR_INVAL;
 336                 goto done;
 337         }
 338         edesc = xfer->endpoint->edesc;
 339         ecomp = xfer->endpoint->ecomp;
 340
 341         type = (edesc->bmAttributes & UE_XFERTYPE);
 342
 343         xfer->flags = setup->flags;
 344         xfer->nframes = setup->frames;
 345         xfer->timeout = setup->timeout;
 346         xfer->callback = setup->callback;
 347         xfer->interval = setup->interval;
 348         xfer->endpointno = edesc->bEndpointAddress;
 349         xfer->max_packet_size = UGETW(edesc->wMaxPacketSize);
 350         xfer->max_packet_count = 1;
 351         /* make a shadow copy: */
 352         xfer->flags_int.usb_mode = parm->udev->flags.usb_mode;
 353
 354         parm->bufsize = setup->bufsize;
 355
 356         switch (parm->speed) {
 357         case USB_SPEED_HIGH:
 358                 switch (type) {
 359                 case UE_ISOCHRONOUS:
 360                 case UE_INTERRUPT:
 361                         xfer->max_packet_count += (xfer->max_packet_size >> 11) & 3;
 362
 363                         /* check for invalid max packet count */
 364                         if (xfer->max_packet_count > 3)
 365                                 xfer->max_packet_count = 3;
 366                         break;
 367                 default:
 368                         break;
 369                 }
 370                 xfer->max_packet_size &= 0x7FF;
 371                 break;
 372         case USB_SPEED_SUPER:
 373                 xfer->max_packet_count += (xfer->max_packet_size >> 11) & 3;
 374
 375                 if (ecomp != NULL)
 376                         xfer->max_packet_count += ecomp->bMaxBurst;
 377
 378                 if ((xfer->max_packet_count == 0) ||
 379                     (xfer->max_packet_count > 16))
 380                         xfer->max_packet_count = 16;
 381
 382                 switch (type) {
 383                 case UE_CONTROL:
 384                         xfer->max_packet_count = 1;
 385                         break;
 386                 case UE_ISOCHRONOUS:
 387                         if (ecomp != NULL) {
 388                                 uint8_t mult;
 389
 390                                 mult = (ecomp->bmAttributes & 3) + 1;
 391                                 if (mult > 3)
 392                                         mult = 3;
 393
 394                                 xfer->max_packet_count *= mult;
 395                         }
 396                         break;
 397                 default:
 398                         break;
 399                 }
 400                 xfer->max_packet_size &= 0x7FF;
 401                 break;
 402         default:
 403                 break;
 404         }
 405         /* range check "max_packet_count" */
 406
 407         if (xfer->max_packet_count > parm->hc_max_packet_count) {
 408                 xfer->max_packet_count = parm->hc_max_packet_count;
 409         }
 410         /* filter "wMaxPacketSize" according to HC capabilities */
 411
 412         if ((xfer->max_packet_size > parm->hc_max_packet_size) ||
 413             (xfer->max_packet_size == 0)) {
 414                 xfer->max_packet_size = parm->hc_max_packet_size;
 415         }
 416         /* filter "wMaxPacketSize" according to standard sizes */
 417
 418         usbd_get_std_packet_size(&std_size, type, parm->speed);
 419
 420         if (std_size.range.min || std_size.range.max) {
 421
 422                 if (xfer->max_packet_size < std_size.range.min) {
 423                         xfer->max_packet_size = std_size.range.min;
 424                 }
 425                 if (xfer->max_packet_size > std_size.range.max) {
 426                         xfer->max_packet_size = std_size.range.max;
 427                 }
 428         } else {
 429
 430                 if (xfer->max_packet_size >= std_size.fixed[3]) {
 431                         xfer->max_packet_size = std_size.fixed[3];
 432                 } else if (xfer->max_packet_size >= std_size.fixed[2]) {
 433                         xfer->max_packet_size = std_size.fixed[2];
 434                 } else if (xfer->max_packet_size >= std_size.fixed[1]) {
 435                         xfer->max_packet_size = std_size.fixed[1];
 436                 } else {
 437                         /* only one possibility left */
 438                         xfer->max_packet_size = std_size.fixed[0];
 439                 }
 440         }
 441
 442         /* compute "max_frame_size" */
 443
 444         usbd_update_max_frame_size(xfer);
 445
 446         /* check interrupt interval and transfer pre-delay */
 447
 448         if (type == UE_ISOCHRONOUS) {
 449
 450                 uint16_t frame_limit;
 451
 452                 xfer->interval = 0;     /* not used, must be zero */
 453                 xfer->flags_int.isochronous_xfr = 1;    /* set flag */
 454
 455                 if (xfer->timeout == 0) {
 456                         /*
 457                          * set a default timeout in
 458                          * case something goes wrong!
 459                          */
 460                         xfer->timeout = 1000 / 4;
 461                 }
 462                 switch (parm->speed) {
 463                 case USB_SPEED_LOW:
 464                 case USB_SPEED_FULL:
 465                         frame_limit = USB_MAX_FS_ISOC_FRAMES_PER_XFER;
 466                         xfer->fps_shift = 0;
 467                         break;
 468                 default:
 469                         frame_limit = USB_MAX_HS_ISOC_FRAMES_PER_XFER;
 470                         xfer->fps_shift = edesc->bInterval;
 471                         if (xfer->fps_shift > 0)
 472                                 xfer->fps_shift--;
 473                         if (xfer->fps_shift > 3)
 474                                 xfer->fps_shift = 3;
 475                         if (xfer->flags.pre_scale_frames != 0)
 476                                 xfer->nframes <<= (3 - xfer->fps_shift);
 477                         break;
 478                 }
 479
 480                 if (xfer->nframes > frame_limit) {
 481                         /*
 482                          * this is not going to work
 483                          * cross hardware
 484                          */
 485                         parm->err = USB_ERR_INVAL;
 486                         goto done;
 487                 }
 488                 if (xfer->nframes == 0) {
 489                         /*
 490                          * this is not a valid value
 491                          */
 492                         parm->err = USB_ERR_ZERO_NFRAMES;
 493                         goto done;
 494                 }
 495         } else {
 496
 497                 /*
 498                  * If a value is specified use that else check the
 499                  * endpoint descriptor!
 500                  */
 501                 if (type == UE_INTERRUPT) {
 502
 503                         uint32_t temp;
 504
 505                         if (xfer->interval == 0) {
 506
 507                                 xfer->interval = edesc->bInterval;
 508
 509                                 switch (parm->speed) {
 510                                 case USB_SPEED_LOW:
 511                                 case USB_SPEED_FULL:
 512                                         break;
 513                                 default:
 514                                         /* 125us -> 1ms */
 515                                         if (xfer->interval < 4)
 516                                                 xfer->interval = 1;
 517                                         else if (xfer->interval > 16)
 518                                                 xfer->interval = (1 << (16 - 4));
 519                                         else
 520                                                 xfer->interval =
 521                                                     (1 << (xfer->interval - 4));
 522                                         break;
 523                                 }
 524                         }
 525
 526                         if (xfer->interval == 0) {
 527                                 /*
 528                                  * One millisecond is the smallest
 529                                  * interval we support:
 530                                  */
 531                                 xfer->interval = 1;
 532                         }
 533
 534                         xfer->fps_shift = 0;
 535                         temp = 1;
 536
 537                         while ((temp != 0) && (temp < xfer->interval)) {
 538                                 xfer->fps_shift++;
 539                                 temp *= 2;
 540                         }
 541
 542                         switch (parm->speed) {
 543                         case USB_SPEED_LOW:
 544                         case USB_SPEED_FULL:
 545                                 break;
 546                         default:
 547                                 xfer->fps_shift += 3;
 548                                 break;
 549                         }
 550                 }
 551         }
 552
 553         /*
 554          * NOTE: we do not allow "max_packet_size" or "max_frame_size"
 555          * to be equal to zero when setting up USB transfers, hence
 556          * this leads to alot of extra code in the USB kernel.
 557          */
 558
 559         if ((xfer->max_frame_size == 0) ||
 560             (xfer->max_packet_size == 0)) {
 561
 562                 zmps = 1;
 563
 564                 if ((parm->bufsize <= MIN_PKT) &&
 565                     (type != UE_CONTROL) &&
 566                     (type != UE_BULK)) {
 567
 568                         /* workaround */
 569                         xfer->max_packet_size = MIN_PKT;
 570                         xfer->max_packet_count = 1;
 571                         parm->bufsize = 0;      /* automatic setup length */
 572                         usbd_update_max_frame_size(xfer);
 573
 574                 } else {
 575                         parm->err = USB_ERR_ZERO_MAXP;
 576                         goto done;
 577                 }
 578
 579         } else {
 580                 zmps = 0;
 581         }
 582
 583         /*
 584          * check if we should setup a default
 585          * length:
 586          */
 587
 588         if (parm->bufsize == 0) {
 589
 590                 parm->bufsize = xfer->max_frame_size;
 591
 592                 if (type == UE_ISOCHRONOUS) {
 593                         parm->bufsize *= xfer->nframes;
 594                 }
 595         }
 596         /*
 597          * check if we are about to setup a proxy
 598          * type of buffer:
 599          */
 600
 601         if (xfer->flags.proxy_buffer) {
 602
 603                 /* round bufsize up */
 604
 605                 parm->bufsize += (xfer->max_frame_size - 1);
 606
 607                 if (parm->bufsize < xfer->max_frame_size) {
 608                         /* length wrapped around */
 609                         parm->err = USB_ERR_INVAL;
 610                         goto done;
 611                 }
 612                 /* subtract remainder */
 613
 614                 parm->bufsize -= (parm->bufsize % xfer->max_frame_size);
 615
 616                 /* add length of USB device request structure, if any */
 617
 618                 if (type == UE_CONTROL) {
 619                         parm->bufsize += REQ_SIZE;      /* SETUP message */
 620                 }
 621         }
 622         xfer->max_data_length = parm->bufsize;
 623
 624         /* Setup "n_frlengths" and "n_frbuffers" */
 625
 626         if (type == UE_ISOCHRONOUS) {
 627                 n_frlengths = xfer->nframes;
 628                 n_frbuffers = 1;
 629         } else {
 630
 631                 if (type == UE_CONTROL) {
 632                         xfer->flags_int.control_xfr = 1;
 633                         if (xfer->nframes == 0) {
 634                                 if (parm->bufsize <= REQ_SIZE) {
 635                                         /*
 636                                          * there will never be any data
 637                                          * stage
 638                                          */
 639                                         xfer->nframes = 1;
 640                                 } else {
 641                                         xfer->nframes = 2;
 642                                 }
 643                         }
 644                 } else {
 645                         if (xfer->nframes == 0) {
 646                                 xfer->nframes = 1;
 647                         }
 648                 }
 649
 650                 n_frlengths = xfer->nframes;
 651                 n_frbuffers = xfer->nframes;
 652         }
 653
 654         /*
 655          * check if we have room for the
 656          * USB device request structure:
 657          */
 658
 659         if (type == UE_CONTROL) {
 660
 661                 if (xfer->max_data_length < REQ_SIZE) {
 662                         /* length wrapped around or too small bufsize */
 663                         parm->err = USB_ERR_INVAL;
 664                         goto done;
 665                 }
 666                 xfer->max_data_length -= REQ_SIZE;
 667         }
 668         /*
 669          * Setup "frlengths" and shadow "frlengths" for keeping the
 670          * initial frame lengths when a USB transfer is complete. This
 671          * information is useful when computing isochronous offsets.
 672          */
 673         xfer->frlengths = parm->xfer_length_ptr;
 674         parm->xfer_length_ptr += 2 * n_frlengths;
 675
 676         /* setup "frbuffers" */
 677         xfer->frbuffers = parm->xfer_page_cache_ptr;
 678         parm->xfer_page_cache_ptr += n_frbuffers;
 679
 680         /* initialize max frame count */
 681         xfer->max_frame_count = xfer->nframes;
 682
 683         /*
 684          * check if we need to setup
 685          * a local buffer:
 686          */
 687
 688         if (!xfer->flags.ext_buffer) {
 689
 690                 /* align data */
 691                 parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
 692
 693                 if (parm->buf) {
 694
 695                         xfer->local_buffer =
 696                             USB_ADD_BYTES(parm->buf, parm->size[0]);
 697
 698                         usbd_xfer_set_frame_offset(xfer, 0, 0);
 699
 700                         if ((type == UE_CONTROL) && (n_frbuffers > 1)) {
 701                                 usbd_xfer_set_frame_offset(xfer, REQ_SIZE, 1);
 702                         }
 703                 }
 704                 parm->size[0] += parm->bufsize;
 705
 706                 /* align data again */
 707                 parm->size[0] += ((-parm->size[0]) & (USB_HOST_ALIGN - 1));
 708         }
 709         /*
 710          * Compute maximum buffer size
 711          */
 712
 713         if (parm->bufsize_max < parm->bufsize) {
 714                 parm->bufsize_max = parm->bufsize;
 715         }
 716 #if USB_HAVE_BUSDMA
 717         if (xfer->flags_int.bdma_enable) {
 718                 /*
 719                  * Setup "dma_page_ptr".
 720                  *
 721                  * Proof for formula below:
 722                  *
 723                  * Assume there are three USB frames having length "a", "b" and
 724                  * "c". These USB frames will at maximum need "z"
 725                  * "usb_page" structures. "z" is given by:
 726                  *
 727                  * z = ((a / USB_PAGE_SIZE) + 2) + ((b / USB_PAGE_SIZE) + 2) +
 728                  * ((c / USB_PAGE_SIZE) + 2);
 729                  *
 730                  * Constraining "a", "b" and "c" like this:
 731                  *
 732                  * (a + b + c) <= parm->bufsize
 733                  *
 734                  * We know that:
 735                  *
 736                  * z <= ((parm->bufsize / USB_PAGE_SIZE) + (3*2));
 737                  *
 738                  * Here is the general formula:
 739                  */
 740                 xfer->dma_page_ptr = parm->dma_page_ptr;
 741                 parm->dma_page_ptr += (2 * n_frbuffers);
 742                 parm->dma_page_ptr += (parm->bufsize / USB_PAGE_SIZE);
 743         }
 744 #endif
 745         if (zmps) {
 746                 /* correct maximum data length */
 747                 xfer->max_data_length = 0;
 748         }
 749         /* subtract USB frame remainder from "hc_max_frame_size" */
 750
 751         xfer->max_hc_frame_size =
 752             (parm->hc_max_frame_size -
 753             (parm->hc_max_frame_size % xfer->max_frame_size));
 754
 755         if (xfer->max_hc_frame_size == 0) {
 756                 parm->err = USB_ERR_INVAL;
 757                 goto done;
 758         }
 759
 760         /* initialize frame buffers */
 761
 762         if (parm->buf) {
 763                 for (x = 0; x != n_frbuffers; x++) {
 764                         xfer->frbuffers[x].tag_parent =
 765                             &xfer->xroot->dma_parent_tag;
 766 #if USB_HAVE_BUSDMA
 767                         if (xfer->flags_int.bdma_enable &&
 768                             (parm->bufsize_max > 0)) {
 769
 770                                 if (usb_pc_dmamap_create(
 771                                     xfer->frbuffers + x,
 772                                     parm->bufsize_max)) {
 773                                         parm->err = USB_ERR_NOMEM;
 774                                         goto done;
 775                                 }
 776                         }
 777 #endif
 778                 }
 779         }
 780 done:
 781         if (parm->err) {
 782                 /*
 783                  * Set some dummy values so that we avoid division by zero:
 784                  */
 785                 xfer->max_hc_frame_size = 1;
 786                 xfer->max_frame_size = 1;
 787                 xfer->max_packet_size = 1;
 788                 xfer->max_data_length = 0;
 789                 xfer->nframes = 0;
 790                 xfer->max_frame_count = 0;
 791         }
 792 }
 793
 794 /*------------------------------------------------------------------------*
 795  *      usbd_transfer_setup - setup an array of USB transfers
 796  *
 797  * NOTE: You must always call "usbd_transfer_unsetup" after calling
 798  * "usbd_transfer_setup" if success was returned.
 799  *
 800  * The idea is that the USB device driver should pre-allocate all its
 801  * transfers by one call to this function.
 802  *
 803  * Return values:
 804  *    0: Success
 805  * Else: Failure
 806  *------------------------------------------------------------------------*/
 807 usb_error_t
 808 usbd_transfer_setup(struct usb_device *udev,
 809     const uint8_t *ifaces, struct usb_xfer **ppxfer,
 810     const struct usb_config *setup_start, uint16_t n_setup,
 811     void *priv_sc, struct mtx *xfer_mtx)
 812 {
 813         struct usb_xfer dummy;
 814         struct usb_setup_params parm;
 815         const struct usb_config *setup_end = setup_start + n_setup;
 816         const struct usb_config *setup;
 817         struct usb_endpoint *ep;
 818         struct usb_xfer_root *info;
 819         struct usb_xfer *xfer;
 820         void *buf = NULL;
 821         uint16_t n;
 822         uint16_t refcount;
 823
 824         parm.err = 0;
 825         refcount = 0;
 826         info = NULL;
 827
 828         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
 829             "usbd_transfer_setup can sleep!");
 830
 831         /* do some checking first */
 832
 833         if (n_setup == 0) {
 834                 DPRINTFN(6, "setup array has zero length!\n");
 835                 return (USB_ERR_INVAL);
 836         }
 837         if (ifaces == 0) {
 838                 DPRINTFN(6, "ifaces array is NULL!\n");
 839                 return (USB_ERR_INVAL);
 840         }
 841         if (xfer_mtx == NULL) {
 842                 DPRINTFN(6, "using global lock\n");
 843                 xfer_mtx = &Giant;
 844         }
 845         /* sanity checks */
 846         for (setup = setup_start, n = 0;
 847             setup != setup_end; setup++, n++) {
 848                 if (setup->bufsize == (usb_frlength_t)-1) {
 849                         parm.err = USB_ERR_BAD_BUFSIZE;
 850                         DPRINTF("invalid bufsize\n");
 851                 }
 852                 if (setup->callback == NULL) {
 853                         parm.err = USB_ERR_NO_CALLBACK;
 854                         DPRINTF("no callback\n");
 855                 }
 856                 ppxfer[n] = NULL;
 857         }
 858
 859         if (parm.err) {
 860                 goto done;
 861         }
 862         memset(&parm, 0, sizeof(parm));
 863
 864         parm.udev = udev;
 865         parm.speed = usbd_get_speed(udev);
 866         parm.hc_max_packet_count = 1;
 867
 868         if (parm.speed >= USB_SPEED_MAX) {
 869                 parm.err = USB_ERR_INVAL;
 870                 goto done;
 871         }
 872         /* setup all transfers */
 873
 874         while (1) {
 875
 876                 if (buf) {
 877                         /*
 878                          * Initialize the "usb_xfer_root" structure,
 879                          * which is common for all our USB transfers.
 880                          */
 881                         info = USB_ADD_BYTES(buf, 0);
 882
 883                         info->memory_base = buf;
 884                         info->memory_size = parm.size[0];
 885
 886 #if USB_HAVE_BUSDMA
 887                         info->dma_page_cache_start = USB_ADD_BYTES(buf, parm.size[4]);
 888                         info->dma_page_cache_end = USB_ADD_BYTES(buf, parm.size[5]);
 889 #endif
 890                         info->xfer_page_cache_start = USB_ADD_BYTES(buf, parm.size[5]);
 891                         info->xfer_page_cache_end = USB_ADD_BYTES(buf, parm.size[2]);
 892
 893                         cv_init(&info->cv_drain, "WDRAIN");
 894
 895                         info->xfer_mtx = xfer_mtx;
 896 #if USB_HAVE_BUSDMA
 897                         usb_dma_tag_setup(&info->dma_parent_tag,
 898                             parm.dma_tag_p, udev->bus->dma_parent_tag[0].tag,
 899                             xfer_mtx, &usb_bdma_done_event, 32, parm.dma_tag_max);
 900 #endif
 901
 902                         info->bus = udev->bus;
 903                         info->udev = udev;
 904
 905                         TAILQ_INIT(&info->done_q.head);
 906                         info->done_q.command = &usbd_callback_wrapper;
 907 #if USB_HAVE_BUSDMA
 908                         TAILQ_INIT(&info->dma_q.head);
 909                         info->dma_q.command = &usb_bdma_work_loop;
 910 #endif
 911                         info->done_m[0].hdr.pm_callback = &usb_callback_proc;
 912                         info->done_m[0].xroot = info;
 913                         info->done_m[1].hdr.pm_callback = &usb_callback_proc;
 914                         info->done_m[1].xroot = info;
 915
 916                         /*
 917                          * In device side mode control endpoint
 918                          * requests need to run from a separate
 919                          * context, else there is a chance of
 920                          * deadlock!
 921                          */
 922                         if (setup_start == usb_control_ep_cfg)
 923                                 info->done_p =
 924                                     &udev->bus->control_xfer_proc;
 925                         else if (xfer_mtx == &Giant)
 926                                 info->done_p =
 927                                     &udev->bus->giant_callback_proc;
 928                         else
 929                                 info->done_p =
 930                                     &udev->bus->non_giant_callback_proc;
 931                 }
 932                 /* reset sizes */
 933
 934                 parm.size[0] = 0;
 935                 parm.buf = buf;
 936                 parm.size[0] += sizeof(info[0]);
 937
 938                 for (setup = setup_start, n = 0;
 939                     setup != setup_end; setup++, n++) {
 940
 941                         /* skip USB transfers without callbacks: */
 942                         if (setup->callback == NULL) {
 943                                 continue;
 944                         }
 945                         /* see if there is a matching endpoint */
 946                         ep = usbd_get_endpoint(udev,
 947                             ifaces[setup->if_index], setup);
 948
 949                         if ((ep == NULL) || (ep->methods == NULL)) {
 950                                 if (setup->flags.no_pipe_ok)
 951                                         continue;
 952                                 if ((setup->usb_mode != USB_MODE_DUAL) &&
 953                                     (setup->usb_mode != udev->flags.usb_mode))
 954                                         continue;
 955                                 parm.err = USB_ERR_NO_PIPE;
 956                                 goto done;
 957                         }
 958
 959                         /* align data properly */
 960                         parm.size[0] += ((-parm.size[0]) & (USB_HOST_ALIGN - 1));
 961
 962                         /* store current setup pointer */
 963                         parm.curr_setup = setup;
 964
 965                         if (buf) {
 966                                 /*
 967                                  * Common initialization of the
 968                                  * "usb_xfer" structure.
 969                                  */
 970                                 xfer = USB_ADD_BYTES(buf, parm.size[0]);
 971                                 xfer->address = udev->address;
 972                                 xfer->priv_sc = priv_sc;
 973                                 xfer->xroot = info;
 974
 975                                 usb_callout_init_mtx(&xfer->timeout_handle,
 976                                     &udev->bus->bus_mtx, 0);
 977                         } else {
 978                                 /*
 979                                  * Setup a dummy xfer, hence we are
 980                                  * writing to the "usb_xfer"
 981                                  * structure pointed to by "xfer"
 982                                  * before we have allocated any
 983                                  * memory:
 984                                  */
 985                                 xfer = &dummy;
 986                                 memset(&dummy, 0, sizeof(dummy));
 987                                 refcount++;
 988                         }
 989
 990                         /* set transfer endpoint pointer */
 991                         xfer->endpoint = ep;
 992
 993                         parm.size[0] += sizeof(xfer[0]);
 994                         parm.methods = xfer->endpoint->methods;
 995                         parm.curr_xfer = xfer;
 996
 997                         /*
 998                          * Call the Host or Device controller transfer
 999                          * setup routine:
1000                          */
1001                         (udev->bus->methods->xfer_setup) (&parm);
1002
1003                         /* check for error */
1004                         if (parm.err)
1005                                 goto done;
1006
1007                         if (buf) {
1008                                 /*
1009                                  * Increment the endpoint refcount. This
1010                                  * basically prevents setting a new
1011                                  * configuration and alternate setting
1012                                  * when USB transfers are in use on
1013                                  * the given interface. Search the USB
1014                                  * code for "endpoint->refcount_alloc" if you
1015                                  * want more information.
1016                                  */
1017                                 USB_BUS_LOCK(info->bus);
1018                                 if (xfer->endpoint->refcount_alloc >= USB_EP_REF_MAX)
1019                                         parm.err = USB_ERR_INVAL;
1020
1021                                 xfer->endpoint->refcount_alloc++;
1022
1023                                 if (xfer->endpoint->refcount_alloc == 0)
1024                                         panic("usbd_transfer_setup(): Refcount wrapped to zero\n");
1025                                 USB_BUS_UNLOCK(info->bus);
1026
1027                                 /*
1028                                  * Whenever we set ppxfer[] then we
1029                                  * also need to increment the
1030                                  * "setup_refcount":
1031                                  */
1032                                 info->setup_refcount++;
1033
1034                                 /*
1035                                  * Transfer is successfully setup and
1036                                  * can be used:
1037                                  */
1038                                 ppxfer[n] = xfer;
1039                         }
1040
1041                         /* check for error */
1042                         if (parm.err)
1043                                 goto done;
1044                 }
1045
1046                 if (buf || parm.err) {
1047                         goto done;
1048                 }
1049                 if (refcount == 0) {
1050                         /* no transfers - nothing to do ! */
1051                         goto done;
1052                 }
1053                 /* align data properly */
1054                 parm.size[0] += ((-parm.size[0]) & (USB_HOST_ALIGN - 1));
1055
1056                 /* store offset temporarily */
1057                 parm.size[1] = parm.size[0];
1058
1059                 /*
1060                  * The number of DMA tags required depends on
1061                  * the number of endpoints. The current estimate
1062                  * for maximum number of DMA tags per endpoint
1063                  * is two.
1064                  */
1065                 parm.dma_tag_max += 2 * MIN(n_setup, USB_EP_MAX);
1066
1067                 /*
1068                  * DMA tags for QH, TD, Data and more.
1069                  */
1070                 parm.dma_tag_max += 8;
1071
1072                 parm.dma_tag_p += parm.dma_tag_max;
1073
1074                 parm.size[0] += ((uint8_t *)parm.dma_tag_p) -
1075                     ((uint8_t *)0);
1076
1077                 /* align data properly */
1078                 parm.size[0] += ((-parm.size[0]) & (USB_HOST_ALIGN - 1));
1079
1080                 /* store offset temporarily */
1081                 parm.size[3] = parm.size[0];
1082
1083                 parm.size[0] += ((uint8_t *)parm.dma_page_ptr) -
1084                     ((uint8_t *)0);
1085
1086                 /* align data properly */
1087                 parm.size[0] += ((-parm.size[0]) & (USB_HOST_ALIGN - 1));
1088
1089                 /* store offset temporarily */
1090                 parm.size[4] = parm.size[0];
1091
1092                 parm.size[0] += ((uint8_t *)parm.dma_page_cache_ptr) -
1093                     ((uint8_t *)0);
1094
1095                 /* store end offset temporarily */
1096                 parm.size[5] = parm.size[0];
1097
1098                 parm.size[0] += ((uint8_t *)parm.xfer_page_cache_ptr) -
1099                     ((uint8_t *)0);
1100
1101                 /* store end offset temporarily */
1102
1103                 parm.size[2] = parm.size[0];
1104
1105                 /* align data properly */
1106                 parm.size[0] += ((-parm.size[0]) & (USB_HOST_ALIGN - 1));
1107
1108                 parm.size[6] = parm.size[0];
1109
1110                 parm.size[0] += ((uint8_t *)parm.xfer_length_ptr) -
1111                     ((uint8_t *)0);
1112
1113                 /* align data properly */
1114                 parm.size[0] += ((-parm.size[0]) & (USB_HOST_ALIGN - 1));
1115
1116                 /* allocate zeroed memory */
1117                 buf = malloc(parm.size[0], M_USB, M_WAITOK | M_ZERO);
1118
1119                 if (buf == NULL) {
1120                         parm.err = USB_ERR_NOMEM;
1121                         DPRINTFN(0, "cannot allocate memory block for "
1122                             "configuration (%d bytes)\n",
1123                             parm.size[0]);
1124                         goto done;
1125                 }
1126                 parm.dma_tag_p = USB_ADD_BYTES(buf, parm.size[1]);
1127                 parm.dma_page_ptr = USB_ADD_BYTES(buf, parm.size[3]);
1128                 parm.dma_page_cache_ptr = USB_ADD_BYTES(buf, parm.size[4]);
1129                 parm.xfer_page_cache_ptr = USB_ADD_BYTES(buf, parm.size[5]);
1130                 parm.xfer_length_ptr = USB_ADD_BYTES(buf, parm.size[6]);
1131         }
1132
1133 done:
1134         if (buf) {
1135                 if (info->setup_refcount == 0) {
1136                         /*
1137                          * "usbd_transfer_unsetup_sub" will unlock
1138                          * the bus mutex before returning !
1139                          */
1140                         USB_BUS_LOCK(info->bus);
1141
1142                         /* something went wrong */
1143                         usbd_transfer_unsetup_sub(info, 0);
1144                 }
1145         }
1146         if (parm.err) {
1147                 usbd_transfer_unsetup(ppxfer, n_setup);
1148         }
1149         return (parm.err);
1150 }
1151
1152 /*------------------------------------------------------------------------*
1153  *      usbd_transfer_unsetup_sub - factored out code
1154  *------------------------------------------------------------------------*/
1155 static void
1156 usbd_transfer_unsetup_sub(struct usb_xfer_root *info, uint8_t needs_delay)
1157 {
1158 #if USB_HAVE_BUSDMA
1159         struct usb_page_cache *pc;
1160 #endif
1161
1162         USB_BUS_LOCK_ASSERT(info->bus, MA_OWNED);
1163
1164         /* wait for any outstanding DMA operations */
1165
1166         if (needs_delay) {
1167                 usb_timeout_t temp;
1168                 temp = usbd_get_dma_delay(info->udev);
1169                 if (temp != 0) {
1170                         usb_pause_mtx(&info->bus->bus_mtx,
1171                             USB_MS_TO_TICKS(temp));
1172                 }
1173         }
1174
1175         /* make sure that our done messages are not queued anywhere */
1176         usb_proc_mwait(info->done_p, &info->done_m[0], &info->done_m[1]);
1177
1178         USB_BUS_UNLOCK(info->bus);
1179
1180 #if USB_HAVE_BUSDMA
1181         /* free DMA'able memory, if any */
1182         pc = info->dma_page_cache_start;
1183         while (pc != info->dma_page_cache_end) {
1184                 usb_pc_free_mem(pc);
1185                 pc++;
1186         }
1187
1188         /* free DMA maps in all "xfer->frbuffers" */
1189         pc = info->xfer_page_cache_start;
1190         while (pc != info->xfer_page_cache_end) {
1191                 usb_pc_dmamap_destroy(pc);
1192                 pc++;
1193         }
1194
1195         /* free all DMA tags */
1196         usb_dma_tag_unsetup(&info->dma_parent_tag);
1197 #endif
1198
1199         cv_destroy(&info->cv_drain);
1200
1201         /*
1202          * free the "memory_base" last, hence the "info" structure is
1203          * contained within the "memory_base"!
1204          */
1205         free(info->memory_base, M_USB);
1206 }
1207
1208 /*------------------------------------------------------------------------*
1209  *      usbd_transfer_unsetup - unsetup/free an array of USB transfers
1210  *
1211  * NOTE: All USB transfers in progress will get called back passing
1212  * the error code "USB_ERR_CANCELLED" before this function
1213  * returns.
1214  *------------------------------------------------------------------------*/
1215 void
1216 usbd_transfer_unsetup(struct usb_xfer **pxfer, uint16_t n_setup)
1217 {
1218         struct usb_xfer *xfer;
1219         struct usb_xfer_root *info;
1220         uint8_t needs_delay = 0;
1221
1222         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
1223             "usbd_transfer_unsetup can sleep!");
1224
1225         while (n_setup--) {
1226                 xfer = pxfer[n_setup];
1227
1228                 if (xfer == NULL)
1229                         continue;
1230
1231                 info = xfer->xroot;
1232
1233                 USB_XFER_LOCK(xfer);
1234                 USB_BUS_LOCK(info->bus);
1235
1236                 /*
1237                  * HINT: when you start/stop a transfer, it might be a
1238                  * good idea to directly use the "pxfer[]" structure:
1239                  *
1240                  * usbd_transfer_start(sc->pxfer[0]);
1241                  * usbd_transfer_stop(sc->pxfer[0]);
1242                  *
1243                  * That way, if your code has many parts that will not
1244                  * stop running under the same lock, in other words
1245                  * "xfer_mtx", the usbd_transfer_start and
1246                  * usbd_transfer_stop functions will simply return
1247                  * when they detect a NULL pointer argument.
1248                  *
1249                  * To avoid any races we clear the "pxfer[]" pointer
1250                  * while holding the private mutex of the driver:
1251                  */
1252                 pxfer[n_setup] = NULL;
1253
1254                 USB_BUS_UNLOCK(info->bus);
1255                 USB_XFER_UNLOCK(xfer);
1256
1257                 usbd_transfer_drain(xfer);
1258
1259 #if USB_HAVE_BUSDMA
1260                 if (xfer->flags_int.bdma_enable)
1261                         needs_delay = 1;
1262 #endif
1263                 /*
1264                  * NOTE: default endpoint does not have an
1265                  * interface, even if endpoint->iface_index == 0
1266                  */
1267                 USB_BUS_LOCK(info->bus);
1268                 xfer->endpoint->refcount_alloc--;
1269                 USB_BUS_UNLOCK(info->bus);
1270
1271                 usb_callout_drain(&xfer->timeout_handle);
1272
1273                 USB_BUS_LOCK(info->bus);
1274
1275                 USB_ASSERT(info->setup_refcount != 0, ("Invalid setup "
1276                     "reference count\n"));
1277
1278                 info->setup_refcount--;
1279
1280                 if (info->setup_refcount == 0) {
1281                         usbd_transfer_unsetup_sub(info,
1282                             needs_delay);
1283                 } else {
1284                         USB_BUS_UNLOCK(info->bus);
1285                 }
1286         }
1287 }
1288
1289 /*------------------------------------------------------------------------*
1290  *      usbd_control_transfer_init - factored out code
1291  *
1292  * In USB Device Mode we have to wait for the SETUP packet which
1293  * containst the "struct usb_device_request" structure, before we can
1294  * transfer any data. In USB Host Mode we already have the SETUP
1295  * packet at the moment the USB transfer is started. This leads us to
1296  * having to setup the USB transfer at two different places in
1297  * time. This function just contains factored out control transfer
1298  * initialisation code, so that we don't duplicate the code.
1299  *------------------------------------------------------------------------*/
1300 static void
1301 usbd_control_transfer_init(struct usb_xfer *xfer)
1302 {
1303         struct usb_device_request req;
1304
1305         /* copy out the USB request header */
1306
1307         usbd_copy_out(xfer->frbuffers, 0, &req, sizeof(req));
1308
1309         /* setup remainder */
1310
1311         xfer->flags_int.control_rem = UGETW(req.wLength);
1312
1313         /* copy direction to endpoint variable */
1314
1315         xfer->endpointno &= ~(UE_DIR_IN | UE_DIR_OUT);
1316         xfer->endpointno |=
1317             (req.bmRequestType & UT_READ) ? UE_DIR_IN : UE_DIR_OUT;
1318 }
1319
1320 /*------------------------------------------------------------------------*
1321  *      usbd_setup_ctrl_transfer
1322  *
1323  * This function handles initialisation of control transfers. Control
1324  * transfers are special in that regard that they can both transmit
1325  * and receive data.
1326  *
1327  * Return values:
1328  *    0: Success
1329  * Else: Failure
1330  *------------------------------------------------------------------------*/
1331 static int
1332 usbd_setup_ctrl_transfer(struct usb_xfer *xfer)
1333 {
1334         usb_frlength_t len;
1335
1336         /* Check for control endpoint stall */
1337         if (xfer->flags.stall_pipe && xfer->flags_int.control_act) {
1338                 /* the control transfer is no longer active */
1339                 xfer->flags_int.control_stall = 1;
1340                 xfer->flags_int.control_act = 0;
1341         } else {
1342                 /* don't stall control transfer by default */
1343                 xfer->flags_int.control_stall = 0;
1344         }
1345
1346         /* Check for invalid number of frames */
1347         if (xfer->nframes > 2) {
1348                 /*
1349                  * If you need to split a control transfer, you
1350                  * have to do one part at a time. Only with
1351                  * non-control transfers you can do multiple
1352                  * parts a time.
1353                  */
1354                 DPRINTFN(0, "Too many frames: %u\n",
1355                     (unsigned int)xfer->nframes);
1356                 goto error;
1357         }
1358
1359         /*
1360          * Check if there is a control
1361          * transfer in progress:
1362          */
1363         if (xfer->flags_int.control_act) {
1364
1365                 if (xfer->flags_int.control_hdr) {
1366
1367                         /* clear send header flag */
1368
1369                         xfer->flags_int.control_hdr = 0;
1370
1371                         /* setup control transfer */
1372                         if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
1373                                 usbd_control_transfer_init(xfer);
1374                         }
1375                 }
1376                 /* get data length */
1377
1378                 len = xfer->sumlen;
1379
1380         } else {
1381
1382                 /* the size of the SETUP structure is hardcoded ! */
1383
1384                 if (xfer->frlengths[0] != sizeof(struct usb_device_request)) {
1385                         DPRINTFN(0, "Wrong framelength %u != %zu\n",
1386                             xfer->frlengths[0], sizeof(struct
1387                             usb_device_request));
1388                         goto error;
1389                 }
1390                 /* check USB mode */
1391                 if (xfer->flags_int.usb_mode == USB_MODE_DEVICE) {
1392
1393                         /* check number of frames */
1394                         if (xfer->nframes != 1) {
1395                                 /*
1396                                  * We need to receive the setup
1397                                  * message first so that we know the
1398                                  * data direction!
1399                                  */
1400                                 DPRINTF("Misconfigured transfer\n");
1401                                 goto error;
1402                         }
1403                         /*
1404                          * Set a dummy "control_rem" value.  This
1405                          * variable will be overwritten later by a
1406                          * call to "usbd_control_transfer_init()" !
1407                          */
1408                         xfer->flags_int.control_rem = 0xFFFF;
1409                 } else {
1410
1411                         /* setup "endpoint" and "control_rem" */
1412
1413                         usbd_control_transfer_init(xfer);
1414                 }
1415
1416                 /* set transfer-header flag */
1417
1418                 xfer->flags_int.control_hdr = 1;
1419
1420                 /* get data length */
1421
1422                 len = (xfer->sumlen - sizeof(struct usb_device_request));
1423         }
1424
1425         /* check if there is a length mismatch */
1426
1427         if (len > xfer->flags_int.control_rem) {
1428                 DPRINTFN(0, "Length (%d) greater than "
1429                     "remaining length (%d)\n", len,
1430                     xfer->flags_int.control_rem);
1431                 goto error;
1432         }
1433         /* check if we are doing a short transfer */
1434
1435         if (xfer->flags.force_short_xfer) {
1436                 xfer->flags_int.control_rem = 0;
1437         } else {
1438                 if ((len != xfer->max_data_length) &&
1439                     (len != xfer->flags_int.control_rem) &&
1440                     (xfer->nframes != 1)) {
1441                         DPRINTFN(0, "Short control transfer without "
1442                             "force_short_xfer set\n");
1443                         goto error;
1444                 }
1445                 xfer->flags_int.control_rem -= len;
1446         }
1447
1448         /* the status part is executed when "control_act" is 0 */
1449
1450         if ((xfer->flags_int.control_rem > 0) ||
1451             (xfer->flags.manual_status)) {
1452                 /* don't execute the STATUS stage yet */
1453                 xfer->flags_int.control_act = 1;
1454
1455                 /* sanity check */
1456                 if ((!xfer->flags_int.control_hdr) &&
1457                     (xfer->nframes == 1)) {
1458                         /*
1459                          * This is not a valid operation!
1460                          */
1461                         DPRINTFN(0, "Invalid parameter "
1462                             "combination\n");
1463                         goto error;
1464                 }
1465         } else {
1466                 /* time to execute the STATUS stage */
1467                 xfer->flags_int.control_act = 0;
1468         }
1469         return (0);                     /* success */
1470
1471 error:
1472         return (1);                     /* failure */
1473 }
1474
1475 /*------------------------------------------------------------------------*
1476  *      usbd_transfer_submit - start USB hardware for the given transfer
1477  *
1478  * This function should only be called from the USB callback.
1479  *------------------------------------------------------------------------*/
1480 void
1481 usbd_transfer_submit(struct usb_xfer *xfer)
1482 {
1483         struct usb_xfer_root *info;
1484         struct usb_bus *bus;
1485         usb_frcount_t x;
1486
1487         info = xfer->xroot;
1488         bus = info->bus;
1489
1490         DPRINTF("xfer=%p, endpoint=%p, nframes=%d, dir=%s\n",
1491             xfer, xfer->endpoint, xfer->nframes, USB_GET_DATA_ISREAD(xfer) ?
1492             "read" : "write");
1493
1494 #ifdef USB_DEBUG
1495         if (USB_DEBUG_VAR > 0) {
1496                 USB_BUS_LOCK(bus);
1497
1498                 usb_dump_endpoint(xfer->endpoint);
1499
1500                 USB_BUS_UNLOCK(bus);
1501         }
1502 #endif
1503
1504         USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
1505         USB_BUS_LOCK_ASSERT(bus, MA_NOTOWNED);
1506
1507         /* Only open the USB transfer once! */
1508         if (!xfer->flags_int.open) {
1509                 xfer->flags_int.open = 1;
1510
1511                 DPRINTF("open\n");
1512
1513                 USB_BUS_LOCK(bus);
1514                 (xfer->endpoint->methods->open) (xfer);
1515                 USB_BUS_UNLOCK(bus);
1516         }
1517         /* set "transferring" flag */
1518         xfer->flags_int.transferring = 1;
1519
1520 #if USB_HAVE_POWERD
1521         /* increment power reference */
1522         usbd_transfer_power_ref(xfer, 1);
1523 #endif
1524         /*
1525          * Check if the transfer is waiting on a queue, most
1526          * frequently the "done_q":
1527          */
1528         if (xfer->wait_queue) {
1529                 USB_BUS_LOCK(bus);
1530                 usbd_transfer_dequeue(xfer);
1531                 USB_BUS_UNLOCK(bus);
1532         }
1533         /* clear "did_dma_delay" flag */
1534         xfer->flags_int.did_dma_delay = 0;
1535
1536         /* clear "did_close" flag */
1537         xfer->flags_int.did_close = 0;
1538
1539 #if USB_HAVE_BUSDMA
1540         /* clear "bdma_setup" flag */
1541         xfer->flags_int.bdma_setup = 0;
1542 #endif
1543         /* by default we cannot cancel any USB transfer immediately */
1544         xfer->flags_int.can_cancel_immed = 0;
1545
1546         /* clear lengths and frame counts by default */
1547         xfer->sumlen = 0;
1548         xfer->actlen = 0;
1549         xfer->aframes = 0;
1550
1551         /* clear any previous errors */
1552         xfer->error = 0;
1553
1554         /* Check if the device is still alive */
1555         if (info->udev->state < USB_STATE_POWERED) {
1556                 USB_BUS_LOCK(bus);
1557                 /*
1558                  * Must return cancelled error code else
1559                  * device drivers can hang.
1560                  */
1561                 usbd_transfer_done(xfer, USB_ERR_CANCELLED);
1562                 USB_BUS_UNLOCK(bus);
1563                 return;
1564         }
1565
1566         /* sanity check */
1567         if (xfer->nframes == 0) {
1568                 if (xfer->flags.stall_pipe) {
1569                         /*
1570                          * Special case - want to stall without transferring
1571                          * any data:
1572                          */
1573                         DPRINTF("xfer=%p nframes=0: stall "
1574                             "or clear stall!\n", xfer);
1575                         USB_BUS_LOCK(bus);
1576                         xfer->flags_int.can_cancel_immed = 1;
1577                         /* start the transfer */
1578                         usb_command_wrapper(&xfer->endpoint->endpoint_q, xfer);
1579                         USB_BUS_UNLOCK(bus);
1580                         return;
1581                 }
1582                 USB_BUS_LOCK(bus);
1583                 usbd_transfer_done(xfer, USB_ERR_INVAL);
1584                 USB_BUS_UNLOCK(bus);
1585                 return;
1586         }
1587         /* compute some variables */
1588
1589         for (x = 0; x != xfer->nframes; x++) {
1590                 /* make a copy of the frlenghts[] */
1591                 xfer->frlengths[x + xfer->max_frame_count] = xfer->frlengths[x];
1592                 /* compute total transfer length */
1593                 xfer->sumlen += xfer->frlengths[x];
1594                 if (xfer->sumlen < xfer->frlengths[x]) {
1595                         /* length wrapped around */
1596                         USB_BUS_LOCK(bus);
1597                         usbd_transfer_done(xfer, USB_ERR_INVAL);
1598                         USB_BUS_UNLOCK(bus);
1599                         return;
1600                 }
1601         }
1602
1603         /* clear some internal flags */
1604
1605         xfer->flags_int.short_xfer_ok = 0;
1606         xfer->flags_int.short_frames_ok = 0;
1607
1608         /* check if this is a control transfer */
1609
1610         if (xfer->flags_int.control_xfr) {
1611
1612                 if (usbd_setup_ctrl_transfer(xfer)) {
1613                         USB_BUS_LOCK(bus);
1614                         usbd_transfer_done(xfer, USB_ERR_STALLED);
1615                         USB_BUS_UNLOCK(bus);
1616                         return;
1617                 }
1618         }
1619         /*
1620          * Setup filtered version of some transfer flags,
1621          * in case of data read direction
1622          */
1623         if (USB_GET_DATA_ISREAD(xfer)) {
1624
1625                 if (xfer->flags.short_frames_ok) {
1626                         xfer->flags_int.short_xfer_ok = 1;
1627                         xfer->flags_int.short_frames_ok = 1;
1628                 } else if (xfer->flags.short_xfer_ok) {
1629                         xfer->flags_int.short_xfer_ok = 1;
1630
1631                         /* check for control transfer */
1632                         if (xfer->flags_int.control_xfr) {
1633                                 /*
1634                                  * 1) Control transfers do not support
1635                                  * reception of multiple short USB
1636                                  * frames in host mode and device side
1637                                  * mode, with exception of:
1638                                  *
1639                                  * 2) Due to sometimes buggy device
1640                                  * side firmware we need to do a
1641                                  * STATUS stage in case of short
1642                                  * control transfers in USB host mode.
1643                                  * The STATUS stage then becomes the
1644                                  * "alt_next" to the DATA stage.
1645                                  */
1646                                 xfer->flags_int.short_frames_ok = 1;
1647                         }
1648                 }
1649         }
1650         /*
1651          * Check if BUS-DMA support is enabled and try to load virtual
1652          * buffers into DMA, if any:
1653          */
1654 #if USB_HAVE_BUSDMA
1655         if (xfer->flags_int.bdma_enable) {
1656                 /* insert the USB transfer last in the BUS-DMA queue */
1657                 usb_command_wrapper(&xfer->xroot->dma_q, xfer);
1658                 return;
1659         }
1660 #endif
1661         /*
1662          * Enter the USB transfer into the Host Controller or
1663          * Device Controller schedule:
1664          */
1665         usbd_pipe_enter(xfer);
1666 }
1667
1668 /*------------------------------------------------------------------------*
1669  *      usbd_pipe_enter - factored out code
1670  *------------------------------------------------------------------------*/
1671 void
1672 usbd_pipe_enter(struct usb_xfer *xfer)
1673 {
1674         struct usb_endpoint *ep;
1675
1676         USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
1677
1678         USB_BUS_LOCK(xfer->xroot->bus);
1679
1680         ep = xfer->endpoint;
1681
1682         DPRINTF("enter\n");
1683
1684         /* the transfer can now be cancelled */
1685         xfer->flags_int.can_cancel_immed = 1;
1686
1687         /* enter the transfer */
1688         (ep->methods->enter) (xfer);
1689
1690         /* check for transfer error */
1691         if (xfer->error) {
1692                 /* some error has happened */
1693                 usbd_transfer_done(xfer, 0);
1694                 USB_BUS_UNLOCK(xfer->xroot->bus);
1695                 return;
1696         }
1697
1698         /* start the transfer */
1699         usb_command_wrapper(&ep->endpoint_q, xfer);
1700         USB_BUS_UNLOCK(xfer->xroot->bus);
1701 }
1702
1703 /*------------------------------------------------------------------------*
1704  *      usbd_transfer_start - start an USB transfer
1705  *
1706  * NOTE: Calling this function more than one time will only
1707  *       result in a single transfer start, until the USB transfer
1708  *       completes.
1709  *------------------------------------------------------------------------*/
1710 void
1711 usbd_transfer_start(struct usb_xfer *xfer)
1712 {
1713         if (xfer == NULL) {
1714                 /* transfer is gone */
1715                 return;
1716         }
1717         USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
1718
1719         /* mark the USB transfer started */
1720
1721         if (!xfer->flags_int.started) {
1722                 /* lock the BUS lock to avoid races updating flags_int */
1723                 USB_BUS_LOCK(xfer->xroot->bus);
1724                 xfer->flags_int.started = 1;
1725                 USB_BUS_UNLOCK(xfer->xroot->bus);
1726         }
1727         /* check if the USB transfer callback is already transferring */
1728
1729         if (xfer->flags_int.transferring) {
1730                 return;
1731         }
1732         USB_BUS_LOCK(xfer->xroot->bus);
1733         /* call the USB transfer callback */
1734         usbd_callback_ss_done_defer(xfer);
1735         USB_BUS_UNLOCK(xfer->xroot->bus);
1736 }
1737
1738 /*------------------------------------------------------------------------*
1739  *      usbd_transfer_stop - stop an USB transfer
1740  *
1741  * NOTE: Calling this function more than one time will only
1742  *       result in a single transfer stop.
1743  * NOTE: When this function returns it is not safe to free nor
1744  *       reuse any DMA buffers. See "usbd_transfer_drain()".
1745  *------------------------------------------------------------------------*/
1746 void
1747 usbd_transfer_stop(struct usb_xfer *xfer)
1748 {
1749         struct usb_endpoint *ep;
1750
1751         if (xfer == NULL) {
1752                 /* transfer is gone */
1753                 return;
1754         }
1755         USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
1756
1757         /* check if the USB transfer was ever opened */
1758
1759         if (!xfer->flags_int.open) {
1760                 if (xfer->flags_int.started) {
1761                         /* nothing to do except clearing the "started" flag */
1762                         /* lock the BUS lock to avoid races updating flags_int */
1763                         USB_BUS_LOCK(xfer->xroot->bus);
1764                         xfer->flags_int.started = 0;
1765                         USB_BUS_UNLOCK(xfer->xroot->bus);
1766                 }
1767                 return;
1768         }
1769         /* try to stop the current USB transfer */
1770
1771         USB_BUS_LOCK(xfer->xroot->bus);
1772         /* override any previous error */
1773         xfer->error = USB_ERR_CANCELLED;
1774
1775         /*
1776          * Clear "open" and "started" when both private and USB lock
1777          * is locked so that we don't get a race updating "flags_int"
1778          */
1779         xfer->flags_int.open = 0;
1780         xfer->flags_int.started = 0;
1781
1782         /*
1783          * Check if we can cancel the USB transfer immediately.
1784          */
1785         if (xfer->flags_int.transferring) {
1786                 if (xfer->flags_int.can_cancel_immed &&
1787                     (!xfer->flags_int.did_close)) {
1788                         DPRINTF("close\n");
1789                         /*
1790                          * The following will lead to an USB_ERR_CANCELLED
1791                          * error code being passed to the USB callback.
1792                          */
1793                         (xfer->endpoint->methods->close) (xfer);
1794                         /* only close once */
1795                         xfer->flags_int.did_close = 1;
1796                 } else {
1797                         /* need to wait for the next done callback */
1798                 }
1799         } else {
1800                 DPRINTF("close\n");
1801
1802                 /* close here and now */
1803                 (xfer->endpoint->methods->close) (xfer);
1804
1805                 /*
1806                  * Any additional DMA delay is done by
1807                  * "usbd_transfer_unsetup()".
1808                  */
1809
1810                 /*
1811                  * Special case. Check if we need to restart a blocked
1812                  * endpoint.
1813                  */
1814                 ep = xfer->endpoint;
1815
1816                 /*
1817                  * If the current USB transfer is completing we need
1818                  * to start the next one:
1819                  */
1820                 if (ep->endpoint_q.curr == xfer) {
1821                         usb_command_wrapper(&ep->endpoint_q, NULL);
1822                 }
1823         }
1824
1825         USB_BUS_UNLOCK(xfer->xroot->bus);
1826 }
1827
1828 /*------------------------------------------------------------------------*
1829  *      usbd_transfer_pending
1830  *
1831  * This function will check if an USB transfer is pending which is a
1832  * little bit complicated!
1833  * Return values:
1834  * 0: Not pending
1835  * 1: Pending: The USB transfer will receive a callback in the future.
1836  *------------------------------------------------------------------------*/
1837 uint8_t
1838 usbd_transfer_pending(struct usb_xfer *xfer)
1839 {
1840         struct usb_xfer_root *info;
1841         struct usb_xfer_queue *pq;
1842
1843         if (xfer == NULL) {
1844                 /* transfer is gone */
1845                 return (0);
1846         }
1847         USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
1848
1849         if (xfer->flags_int.transferring) {
1850                 /* trivial case */
1851                 return (1);
1852         }
1853         USB_BUS_LOCK(xfer->xroot->bus);
1854         if (xfer->wait_queue) {
1855                 /* we are waiting on a queue somewhere */
1856                 USB_BUS_UNLOCK(xfer->xroot->bus);
1857                 return (1);
1858         }
1859         info = xfer->xroot;
1860         pq = &info->done_q;
1861
1862         if (pq->curr == xfer) {
1863                 /* we are currently scheduled for callback */
1864                 USB_BUS_UNLOCK(xfer->xroot->bus);
1865                 return (1);
1866         }
1867         /* we are not pending */
1868         USB_BUS_UNLOCK(xfer->xroot->bus);
1869         return (0);
1870 }
1871
1872 /*------------------------------------------------------------------------*
1873  *      usbd_transfer_drain
1874  *
1875  * This function will stop the USB transfer and wait for any
1876  * additional BUS-DMA and HW-DMA operations to complete. Buffers that
1877  * are loaded into DMA can safely be freed or reused after that this
1878  * function has returned.
1879  *------------------------------------------------------------------------*/
1880 void
1881 usbd_transfer_drain(struct usb_xfer *xfer)
1882 {
1883         WITNESS_WARN(WARN_GIANTOK | WARN_SLEEPOK, NULL,
1884             "usbd_transfer_drain can sleep!");
1885
1886         if (xfer == NULL) {
1887                 /* transfer is gone */
1888                 return;
1889         }
1890         if (xfer->xroot->xfer_mtx != &Giant) {
1891                 USB_XFER_LOCK_ASSERT(xfer, MA_NOTOWNED);
1892         }
1893         USB_XFER_LOCK(xfer);
1894
1895         usbd_transfer_stop(xfer);
1896
1897         while (usbd_transfer_pending(xfer) ||
1898             xfer->flags_int.doing_callback) {
1899
1900                 /*
1901                  * It is allowed that the callback can drop its
1902                  * transfer mutex. In that case checking only
1903                  * "usbd_transfer_pending()" is not enough to tell if
1904                  * the USB transfer is fully drained. We also need to
1905                  * check the internal "doing_callback" flag.
1906                  */
1907                 xfer->flags_int.draining = 1;
1908
1909                 /*
1910                  * Wait until the current outstanding USB
1911                  * transfer is complete !
1912                  */
1913                 cv_wait(&xfer->xroot->cv_drain, xfer->xroot->xfer_mtx);
1914         }
1915         USB_XFER_UNLOCK(xfer);
1916 }
1917
1918 struct usb_page_cache *
1919 usbd_xfer_get_frame(struct usb_xfer *xfer, usb_frcount_t frindex)
1920 {
1921         KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
1922
1923         return (&xfer->frbuffers[frindex]);
1924 }
1925
1926 void *
1927 usbd_xfer_get_frame_buffer(struct usb_xfer *xfer, usb_frcount_t frindex)
1928 {
1929         struct usb_page_search page_info;
1930
1931         KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
1932
1933         usbd_get_page(&xfer->frbuffers[frindex], 0, &page_info);
1934         return (page_info.buffer);
1935 }
1936
1937 /*------------------------------------------------------------------------*
1938  *      usbd_xfer_get_fps_shift
1939  *
1940  * The following function is only useful for isochronous transfers. It
1941  * returns how many times the frame execution rate has been shifted
1942  * down.
1943  *
1944  * Return value:
1945  * Success: 0..3
1946  * Failure: 0
1947  *------------------------------------------------------------------------*/
1948 uint8_t
1949 usbd_xfer_get_fps_shift(struct usb_xfer *xfer)
1950 {
1951         return (xfer->fps_shift);
1952 }
1953
1954 usb_frlength_t
1955 usbd_xfer_frame_len(struct usb_xfer *xfer, usb_frcount_t frindex)
1956 {
1957         KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
1958
1959         return (xfer->frlengths[frindex]);
1960 }
1961
1962 /*------------------------------------------------------------------------*
1963  *      usbd_xfer_set_frame_data
1964  *
1965  * This function sets the pointer of the buffer that should
1966  * loaded directly into DMA for the given USB frame. Passing "ptr"
1967  * equal to NULL while the corresponding "frlength" is greater
1968  * than zero gives undefined results!
1969  *------------------------------------------------------------------------*/
1970 void
1971 usbd_xfer_set_frame_data(struct usb_xfer *xfer, usb_frcount_t frindex,
1972     void *ptr, usb_frlength_t len)
1973 {
1974         KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
1975
1976         /* set virtual address to load and length */
1977         xfer->frbuffers[frindex].buffer = ptr;
1978         usbd_xfer_set_frame_len(xfer, frindex, len);
1979 }
1980
1981 void
1982 usbd_xfer_frame_data(struct usb_xfer *xfer, usb_frcount_t frindex,
1983     void **ptr, int *len)
1984 {
1985         KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
1986
1987         if (ptr != NULL)
1988                 *ptr = xfer->frbuffers[frindex].buffer;
1989         if (len != NULL)
1990                 *len = xfer->frlengths[frindex];
1991 }
1992
1993 /*------------------------------------------------------------------------*
1994  *      usbd_xfer_old_frame_length
1995  *
1996  * This function returns the framelength of the given frame at the
1997  * time the transfer was submitted. This function can be used to
1998  * compute the starting data pointer of the next isochronous frame
1999  * when an isochronous transfer has completed.
2000  *------------------------------------------------------------------------*/
2001 usb_frlength_t
2002 usbd_xfer_old_frame_length(struct usb_xfer *xfer, usb_frcount_t frindex)
2003 {
2004         KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
2005
2006         return (xfer->frlengths[frindex + xfer->max_frame_count]);
2007 }
2008
2009 void
2010 usbd_xfer_status(struct usb_xfer *xfer, int *actlen, int *sumlen, int *aframes,
2011     int *nframes)
2012 {
2013         if (actlen != NULL)
2014                 *actlen = xfer->actlen;
2015         if (sumlen != NULL)
2016                 *sumlen = xfer->sumlen;
2017         if (aframes != NULL)
2018                 *aframes = xfer->aframes;
2019         if (nframes != NULL)
2020                 *nframes = xfer->nframes;
2021 }
2022
2023 /*------------------------------------------------------------------------*
2024  *      usbd_xfer_set_frame_offset
2025  *
2026  * This function sets the frame data buffer offset relative to the beginning
2027  * of the USB DMA buffer allocated for this USB transfer.
2028  *------------------------------------------------------------------------*/
2029 void
2030 usbd_xfer_set_frame_offset(struct usb_xfer *xfer, usb_frlength_t offset,
2031     usb_frcount_t frindex)
2032 {
2033         KASSERT(!xfer->flags.ext_buffer, ("Cannot offset data frame "
2034             "when the USB buffer is external\n"));
2035         KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
2036
2037         /* set virtual address to load */
2038         xfer->frbuffers[frindex].buffer =
2039             USB_ADD_BYTES(xfer->local_buffer, offset);
2040 }
2041
2042 void
2043 usbd_xfer_set_interval(struct usb_xfer *xfer, int i)
2044 {
2045         xfer->interval = i;
2046 }
2047
2048 void
2049 usbd_xfer_set_timeout(struct usb_xfer *xfer, int t)
2050 {
2051         xfer->timeout = t;
2052 }
2053
2054 void
2055 usbd_xfer_set_frames(struct usb_xfer *xfer, usb_frcount_t n)
2056 {
2057         xfer->nframes = n;
2058 }
2059
2060 usb_frcount_t
2061 usbd_xfer_max_frames(struct usb_xfer *xfer)
2062 {
2063         return (xfer->max_frame_count);
2064 }
2065
2066 usb_frlength_t
2067 usbd_xfer_max_len(struct usb_xfer *xfer)
2068 {
2069         return (xfer->max_data_length);
2070 }
2071
2072 usb_frlength_t
2073 usbd_xfer_max_framelen(struct usb_xfer *xfer)
2074 {
2075         return (xfer->max_frame_size);
2076 }
2077
2078 void
2079 usbd_xfer_set_frame_len(struct usb_xfer *xfer, usb_frcount_t frindex,
2080     usb_frlength_t len)
2081 {
2082         KASSERT(frindex < xfer->max_frame_count, ("frame index overflow"));
2083
2084         xfer->frlengths[frindex] = len;
2085 }
2086
2087 /*------------------------------------------------------------------------*
2088  *      usb_callback_proc - factored out code
2089  *
2090  * This function performs USB callbacks.
2091  *------------------------------------------------------------------------*/
2092 static void
2093 usb_callback_proc(struct usb_proc_msg *_pm)
2094 {
2095         struct usb_done_msg *pm = (void *)_pm;
2096         struct usb_xfer_root *info = pm->xroot;
2097
2098         /* Change locking order */
2099         USB_BUS_UNLOCK(info->bus);
2100
2101         /*
2102          * We exploit the fact that the mutex is the same for all
2103          * callbacks that will be called from this thread:
2104          */
2105         mtx_lock(info->xfer_mtx);
2106         USB_BUS_LOCK(info->bus);
2107
2108         /* Continue where we lost track */
2109         usb_command_wrapper(&info->done_q,
2110             info->done_q.curr);
2111
2112         mtx_unlock(info->xfer_mtx);
2113 }
2114
2115 /*------------------------------------------------------------------------*
2116  *      usbd_callback_ss_done_defer
2117  *
2118  * This function will defer the start, stop and done callback to the
2119  * correct thread.
2120  *------------------------------------------------------------------------*/
2121 static void
2122 usbd_callback_ss_done_defer(struct usb_xfer *xfer)
2123 {
2124         struct usb_xfer_root *info = xfer->xroot;
2125         struct usb_xfer_queue *pq = &info->done_q;
2126
2127         USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
2128
2129         if (pq->curr != xfer) {
2130                 usbd_transfer_enqueue(pq, xfer);
2131         }
2132         if (!pq->recurse_1) {
2133
2134                 /*
2135                  * We have to postpone the callback due to the fact we
2136                  * will have a Lock Order Reversal, LOR, if we try to
2137                  * proceed !
2138                  */
2139                 if (usb_proc_msignal(info->done_p,
2140                     &info->done_m[0], &info->done_m[1])) {
2141                         /* ignore */
2142                 }
2143         } else {
2144                 /* clear second recurse flag */
2145                 pq->recurse_2 = 0;
2146         }
2147         return;
2148
2149 }
2150
2151 /*------------------------------------------------------------------------*
2152  *      usbd_callback_wrapper
2153  *
2154  * This is a wrapper for USB callbacks. This wrapper does some
2155  * auto-magic things like figuring out if we can call the callback
2156  * directly from the current context or if we need to wakeup the
2157  * interrupt process.
2158  *------------------------------------------------------------------------*/
2159 static void
2160 usbd_callback_wrapper(struct usb_xfer_queue *pq)
2161 {
2162         struct usb_xfer *xfer = pq->curr;
2163         struct usb_xfer_root *info = xfer->xroot;
2164
2165         USB_BUS_LOCK_ASSERT(info->bus, MA_OWNED);
2166         if (!mtx_owned(info->xfer_mtx) && !SCHEDULER_STOPPED()) {
2167                 /*
2168                  * Cases that end up here:
2169                  *
2170                  * 5) HW interrupt done callback or other source.
2171                  */
2172                 DPRINTFN(3, "case 5\n");
2173
2174                 /*
2175                  * We have to postpone the callback due to the fact we
2176                  * will have a Lock Order Reversal, LOR, if we try to
2177                  * proceed !
2178                  */
2179                 if (usb_proc_msignal(info->done_p,
2180                     &info->done_m[0], &info->done_m[1])) {
2181                         /* ignore */
2182                 }
2183                 return;
2184         }
2185         /*
2186          * Cases that end up here:
2187          *
2188          * 1) We are starting a transfer
2189          * 2) We are prematurely calling back a transfer
2190          * 3) We are stopping a transfer
2191          * 4) We are doing an ordinary callback
2192          */
2193         DPRINTFN(3, "case 1-4\n");
2194         /* get next USB transfer in the queue */
2195         info->done_q.curr = NULL;
2196
2197         /* set flag in case of drain */
2198         xfer->flags_int.doing_callback = 1;
2199
2200         USB_BUS_UNLOCK(info->bus);
2201         USB_BUS_LOCK_ASSERT(info->bus, MA_NOTOWNED);
2202
2203         /* set correct USB state for callback */
2204         if (!xfer->flags_int.transferring) {
2205                 xfer->usb_state = USB_ST_SETUP;
2206                 if (!xfer->flags_int.started) {
2207                         /* we got stopped before we even got started */
2208                         USB_BUS_LOCK(info->bus);
2209                         goto done;
2210                 }
2211         } else {
2212
2213                 if (usbd_callback_wrapper_sub(xfer)) {
2214                         /* the callback has been deferred */
2215                         USB_BUS_LOCK(info->bus);
2216                         goto done;
2217                 }
2218 #if USB_HAVE_POWERD
2219                 /* decrement power reference */
2220                 usbd_transfer_power_ref(xfer, -1);
2221 #endif
2222                 xfer->flags_int.transferring = 0;
2223
2224                 if (xfer->error) {
2225                         xfer->usb_state = USB_ST_ERROR;
2226                 } else {
2227                         /* set transferred state */
2228                         xfer->usb_state = USB_ST_TRANSFERRED;
2229 #if USB_HAVE_BUSDMA
2230                         /* sync DMA memory, if any */
2231                         if (xfer->flags_int.bdma_enable &&
2232                             (!xfer->flags_int.bdma_no_post_sync)) {
2233                                 usb_bdma_post_sync(xfer);
2234                         }
2235 #endif
2236                 }
2237         }
2238
2239 #if USB_HAVE_PF
2240         if (xfer->usb_state != USB_ST_SETUP)
2241                 usbpf_xfertap(xfer, USBPF_XFERTAP_DONE);
2242 #endif
2243         /* call processing routine */
2244         (xfer->callback) (xfer, xfer->error);
2245
2246         /* pickup the USB mutex again */
2247         USB_BUS_LOCK(info->bus);
2248
2249         /*
2250          * Check if we got started after that we got cancelled, but
2251          * before we managed to do the callback.
2252          */
2253         if ((!xfer->flags_int.open) &&
2254             (xfer->flags_int.started) &&
2255             (xfer->usb_state == USB_ST_ERROR)) {
2256                 /* clear flag in case of drain */
2257                 xfer->flags_int.doing_callback = 0;
2258                 /* try to loop, but not recursivly */
2259                 usb_command_wrapper(&info->done_q, xfer);
2260                 return;
2261         }
2262
2263 done:
2264         /* clear flag in case of drain */
2265         xfer->flags_int.doing_callback = 0;
2266
2267         /*
2268          * Check if we are draining.
2269          */
2270         if (xfer->flags_int.draining &&
2271             (!xfer->flags_int.transferring)) {
2272                 /* "usbd_transfer_drain()" is waiting for end of transfer */
2273                 xfer->flags_int.draining = 0;
2274                 cv_broadcast(&info->cv_drain);
2275         }
2276
2277         /* do the next callback, if any */
2278         usb_command_wrapper(&info->done_q,
2279             info->done_q.curr);
2280 }
2281
2282 /*------------------------------------------------------------------------*
2283  *      usb_dma_delay_done_cb
2284  *
2285  * This function is called when the DMA delay has been exectuded, and
2286  * will make sure that the callback is called to complete the USB
2287  * transfer. This code path is ususally only used when there is an USB
2288  * error like USB_ERR_CANCELLED.
2289  *------------------------------------------------------------------------*/
2290 void
2291 usb_dma_delay_done_cb(struct usb_xfer *xfer)
2292 {
2293         USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
2294
2295         DPRINTFN(3, "Completed %p\n", xfer);
2296
2297         /* queue callback for execution, again */
2298         usbd_transfer_done(xfer, 0);
2299 }
2300
2301 /*------------------------------------------------------------------------*
2302  *      usbd_transfer_dequeue
2303  *
2304  *  - This function is used to remove an USB transfer from a USB
2305  *  transfer queue.
2306  *
2307  *  - This function can be called multiple times in a row.
2308  *------------------------------------------------------------------------*/
2309 void
2310 usbd_transfer_dequeue(struct usb_xfer *xfer)
2311 {
2312         struct usb_xfer_queue *pq;
2313
2314         pq = xfer->wait_queue;
2315         if (pq) {
2316                 TAILQ_REMOVE(&pq->head, xfer, wait_entry);
2317                 xfer->wait_queue = NULL;
2318         }
2319 }
2320
2321 /*------------------------------------------------------------------------*
2322  *      usbd_transfer_enqueue
2323  *
2324  *  - This function is used to insert an USB transfer into a USB *
2325  *  transfer queue.
2326  *
2327  *  - This function can be called multiple times in a row.
2328  *------------------------------------------------------------------------*/
2329 void
2330 usbd_transfer_enqueue(struct usb_xfer_queue *pq, struct usb_xfer *xfer)
2331 {
2332         /*
2333          * Insert the USB transfer into the queue, if it is not
2334          * already on a USB transfer queue:
2335          */
2336         if (xfer->wait_queue == NULL) {
2337                 xfer->wait_queue = pq;
2338                 TAILQ_INSERT_TAIL(&pq->head, xfer, wait_entry);
2339         }
2340 }
2341
2342 /*------------------------------------------------------------------------*
2343  *      usbd_transfer_done
2344  *
2345  *  - This function is used to remove an USB transfer from the busdma,
2346  *  pipe or interrupt queue.
2347  *
2348  *  - This function is used to queue the USB transfer on the done
2349  *  queue.
2350  *
2351  *  - This function is used to stop any USB transfer timeouts.
2352  *------------------------------------------------------------------------*/
2353 void
2354 usbd_transfer_done(struct usb_xfer *xfer, usb_error_t error)
2355 {
2356         USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
2357
2358         DPRINTF("err=%s\n", usbd_errstr(error));
2359
2360         /*
2361          * If we are not transferring then just return.
2362          * This can happen during transfer cancel.
2363          */
2364         if (!xfer->flags_int.transferring) {
2365                 DPRINTF("not transferring\n");
2366                 /* end of control transfer, if any */
2367                 xfer->flags_int.control_act = 0;
2368                 return;
2369         }
2370         /* only set transfer error if not already set */
2371         if (!xfer->error) {
2372                 xfer->error = error;
2373         }
2374         /* stop any callouts */
2375         usb_callout_stop(&xfer->timeout_handle);
2376
2377         /*
2378          * If we are waiting on a queue, just remove the USB transfer
2379          * from the queue, if any. We should have the required locks
2380          * locked to do the remove when this function is called.
2381          */
2382         usbd_transfer_dequeue(xfer);
2383
2384 #if USB_HAVE_BUSDMA
2385         if (mtx_owned(xfer->xroot->xfer_mtx)) {
2386                 struct usb_xfer_queue *pq;
2387
2388                 /*
2389                  * If the private USB lock is not locked, then we assume
2390                  * that the BUS-DMA load stage has been passed:
2391                  */
2392                 pq = &xfer->xroot->dma_q;
2393
2394                 if (pq->curr == xfer) {
2395                         /* start the next BUS-DMA load, if any */
2396                         usb_command_wrapper(pq, NULL);
2397                 }
2398         }
2399 #endif
2400         /* keep some statistics */
2401         if (xfer->error) {
2402                 xfer->xroot->bus->stats_err.uds_requests
2403                     [xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE]++;
2404         } else {
2405                 xfer->xroot->bus->stats_ok.uds_requests
2406                     [xfer->endpoint->edesc->bmAttributes & UE_XFERTYPE]++;
2407         }
2408
2409         /* call the USB transfer callback */
2410         usbd_callback_ss_done_defer(xfer);
2411 }
2412
2413 /*------------------------------------------------------------------------*
2414  *      usbd_transfer_start_cb
2415  *
2416  * This function is called to start the USB transfer when
2417  * "xfer->interval" is greater than zero, and and the endpoint type is
2418  * BULK or CONTROL.
2419  *------------------------------------------------------------------------*/
2420 static void
2421 usbd_transfer_start_cb(void *arg)
2422 {
2423         struct usb_xfer *xfer = arg;
2424         struct usb_endpoint *ep = xfer->endpoint;
2425
2426         USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
2427
2428         DPRINTF("start\n");
2429
2430 #if USB_HAVE_PF
2431         usbpf_xfertap(xfer, USBPF_XFERTAP_SUBMIT);
2432 #endif
2433
2434         /* the transfer can now be cancelled */
2435         xfer->flags_int.can_cancel_immed = 1;
2436
2437         /* start USB transfer, if no error */
2438         if (xfer->error == 0)
2439                 (ep->methods->start) (xfer);
2440
2441         /* check for transfer error */
2442         if (xfer->error) {
2443                 /* some error has happened */
2444                 usbd_transfer_done(xfer, 0);
2445         }
2446 }
2447
2448 /*------------------------------------------------------------------------*
2449  *      usbd_xfer_set_stall
2450  *
2451  * This function is used to set the stall flag outside the
2452  * callback. This function is NULL safe.
2453  *------------------------------------------------------------------------*/
2454 void
2455 usbd_xfer_set_stall(struct usb_xfer *xfer)
2456 {
2457         if (xfer == NULL) {
2458                 /* tearing down */
2459                 return;
2460         }
2461         USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
2462
2463         /* avoid any races by locking the USB mutex */
2464         USB_BUS_LOCK(xfer->xroot->bus);
2465         xfer->flags.stall_pipe = 1;
2466         USB_BUS_UNLOCK(xfer->xroot->bus);
2467 }
2468
2469 int
2470 usbd_xfer_is_stalled(struct usb_xfer *xfer)
2471 {
2472         return (xfer->endpoint->is_stalled);
2473 }
2474
2475 /*------------------------------------------------------------------------*
2476  *      usbd_transfer_clear_stall
2477  *
2478  * This function is used to clear the stall flag outside the
2479  * callback. This function is NULL safe.
2480  *------------------------------------------------------------------------*/
2481 void
2482 usbd_transfer_clear_stall(struct usb_xfer *xfer)
2483 {
2484         if (xfer == NULL) {
2485                 /* tearing down */
2486                 return;
2487         }
2488         USB_XFER_LOCK_ASSERT(xfer, MA_OWNED);
2489
2490         /* avoid any races by locking the USB mutex */
2491         USB_BUS_LOCK(xfer->xroot->bus);
2492
2493         xfer->flags.stall_pipe = 0;
2494
2495         USB_BUS_UNLOCK(xfer->xroot->bus);
2496 }
2497
2498 /*------------------------------------------------------------------------*
2499  *      usbd_pipe_start
2500  *
2501  * This function is used to add an USB transfer to the pipe transfer list.
2502  *------------------------------------------------------------------------*/
2503 void
2504 usbd_pipe_start(struct usb_xfer_queue *pq)
2505 {
2506         struct usb_endpoint *ep;
2507         struct usb_xfer *xfer;
2508         uint8_t type;
2509
2510         xfer = pq->curr;
2511         ep = xfer->endpoint;
2512
2513         USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
2514
2515         /*
2516          * If the endpoint is already stalled we do nothing !
2517          */
2518         if (ep->is_stalled) {
2519                 return;
2520         }
2521         /*
2522          * Check if we are supposed to stall the endpoint:
2523          */
2524         if (xfer->flags.stall_pipe) {
2525                 struct usb_device *udev;
2526                 struct usb_xfer_root *info;
2527
2528                 /* clear stall command */
2529                 xfer->flags.stall_pipe = 0;
2530
2531                 /* get pointer to USB device */
2532                 info = xfer->xroot;
2533                 udev = info->udev;
2534
2535                 /*
2536                  * Only stall BULK and INTERRUPT endpoints.
2537                  */
2538                 type = (ep->edesc->bmAttributes & UE_XFERTYPE);
2539                 if ((type == UE_BULK) ||
2540                     (type == UE_INTERRUPT)) {
2541                         uint8_t did_stall;
2542
2543                         did_stall = 1;
2544
2545                         if (udev->flags.usb_mode == USB_MODE_DEVICE) {
2546                                 (udev->bus->methods->set_stall) (
2547                                     udev, NULL, ep, &did_stall);
2548                         } else if (udev->ctrl_xfer[1]) {
2549                                 info = udev->ctrl_xfer[1]->xroot;
2550                                 usb_proc_msignal(
2551                                     &info->bus->non_giant_callback_proc,
2552                                     &udev->cs_msg[0], &udev->cs_msg[1]);
2553                         } else {
2554                                 /* should not happen */
2555                                 DPRINTFN(0, "No stall handler\n");
2556                         }
2557                         /*
2558                          * Check if we should stall. Some USB hardware
2559                          * handles set- and clear-stall in hardware.
2560                          */
2561                         if (did_stall) {
2562                                 /*
2563                                  * The transfer will be continued when
2564                                  * the clear-stall control endpoint
2565                                  * message is received.
2566                                  */
2567                                 ep->is_stalled = 1;
2568                                 return;
2569                         }
2570                 } else if (type == UE_ISOCHRONOUS) {
2571
2572                         /*
2573                          * Make sure any FIFO overflow or other FIFO
2574                          * error conditions go away by resetting the
2575                          * endpoint FIFO through the clear stall
2576                          * method.
2577                          */
2578                         if (udev->flags.usb_mode == USB_MODE_DEVICE) {
2579                                 (udev->bus->methods->clear_stall) (udev, ep);
2580                         }
2581                 }
2582         }
2583         /* Set or clear stall complete - special case */
2584         if (xfer->nframes == 0) {
2585                 /* we are complete */
2586                 xfer->aframes = 0;
2587                 usbd_transfer_done(xfer, 0);
2588                 return;
2589         }
2590         /*
2591          * Handled cases:
2592          *
2593          * 1) Start the first transfer queued.
2594          *
2595          * 2) Re-start the current USB transfer.
2596          */
2597         /*
2598          * Check if there should be any
2599          * pre transfer start delay:
2600          */
2601         if (xfer->interval > 0) {
2602                 type = (ep->edesc->bmAttributes & UE_XFERTYPE);
2603                 if ((type == UE_BULK) ||
2604                     (type == UE_CONTROL)) {
2605                         usbd_transfer_timeout_ms(xfer,
2606                             &usbd_transfer_start_cb,
2607                             xfer->interval);
2608                         return;
2609                 }
2610         }
2611         DPRINTF("start\n");
2612
2613 #if USB_HAVE_PF
2614         usbpf_xfertap(xfer, USBPF_XFERTAP_SUBMIT);
2615 #endif
2616         /* the transfer can now be cancelled */
2617         xfer->flags_int.can_cancel_immed = 1;
2618
2619         /* start USB transfer, if no error */
2620         if (xfer->error == 0)
2621                 (ep->methods->start) (xfer);
2622
2623         /* check for transfer error */
2624         if (xfer->error) {
2625                 /* some error has happened */
2626                 usbd_transfer_done(xfer, 0);
2627         }
2628 }
2629
2630 /*------------------------------------------------------------------------*
2631  *      usbd_transfer_timeout_ms
2632  *
2633  * This function is used to setup a timeout on the given USB
2634  * transfer. If the timeout has been deferred the callback given by
2635  * "cb" will get called after "ms" milliseconds.
2636  *------------------------------------------------------------------------*/
2637 void
2638 usbd_transfer_timeout_ms(struct usb_xfer *xfer,
2639     void (*cb) (void *arg), usb_timeout_t ms)
2640 {
2641         USB_BUS_LOCK_ASSERT(xfer->xroot->bus, MA_OWNED);
2642
2643         /* defer delay */
2644         usb_callout_reset(&xfer->timeout_handle,
2645             USB_MS_TO_TICKS(ms), cb, xfer);
2646 }
2647
2648 /*------------------------------------------------------------------------*
2649  *      usbd_callback_wrapper_sub
2650  *
2651  *  - This function will update variables in an USB transfer after
2652  *  that the USB transfer is complete.
2653  *
2654  *  - This function is used to start the next USB transfer on the
2655  *  ep transfer queue, if any.
2656  *
2657  * NOTE: In some special cases the USB transfer will not be removed from
2658  * the pipe queue, but remain first. To enforce USB transfer removal call
2659  * this function passing the error code "USB_ERR_CANCELLED".
2660  *
2661  * Return values:
2662  * 0: Success.
2663  * Else: The callback has been deferred.
2664  *------------------------------------------------------------------------*/
2665 static uint8_t
2666 usbd_callback_wrapper_sub(struct usb_xfer *xfer)
2667 {
2668         struct usb_endpoint *ep;
2669         struct usb_bus *bus;
2670         usb_frcount_t x;
2671
2672         bus = xfer->xroot->bus;
2673
2674         if ((!xfer->flags_int.open) &&
2675             (!xfer->flags_int.did_close)) {
2676                 DPRINTF("close\n");
2677                 USB_BUS_LOCK(bus);
2678                 (xfer->endpoint->methods->close) (xfer);
2679                 USB_BUS_UNLOCK(bus);
2680                 /* only close once */
2681                 xfer->flags_int.did_close = 1;
2682                 return (1);             /* wait for new callback */
2683         }
2684         /*
2685          * If we have a non-hardware induced error we
2686          * need to do the DMA delay!
2687          */
2688         if (xfer->error != 0 && !xfer->flags_int.did_dma_delay &&
2689             (xfer->error == USB_ERR_CANCELLED ||
2690             xfer->error == USB_ERR_TIMEOUT ||
2691             bus->methods->start_dma_delay != NULL)) {
2692
2693                 usb_timeout_t temp;
2694
2695                 /* only delay once */
2696                 xfer->flags_int.did_dma_delay = 1;
2697
2698                 /* we can not cancel this delay */
2699                 xfer->flags_int.can_cancel_immed = 0;
2700
2701                 temp = usbd_get_dma_delay(xfer->xroot->udev);
2702
2703                 DPRINTFN(3, "DMA delay, %u ms, "
2704                     "on %p\n", temp, xfer);
2705
2706                 if (temp != 0) {
2707                         USB_BUS_LOCK(bus);
2708                         /*
2709                          * Some hardware solutions have dedicated
2710                          * events when it is safe to free DMA'ed
2711                          * memory. For the other hardware platforms we
2712                          * use a static delay.
2713                          */
2714                         if (bus->methods->start_dma_delay != NULL) {
2715                                 (bus->methods->start_dma_delay) (xfer);
2716                         } else {
2717                                 usbd_transfer_timeout_ms(xfer,
2718                                     (void (*)(void *))&usb_dma_delay_done_cb,
2719                                     temp);
2720                         }
2721                         USB_BUS_UNLOCK(bus);
2722                         return (1);     /* wait for new callback */
2723                 }
2724         }
2725         /* check actual number of frames */
2726         if (xfer->aframes > xfer->nframes) {
2727                 if (xfer->error == 0) {
2728                         panic("%s: actual number of frames, %d, is "
2729                             "greater than initial number of frames, %d\n",
2730                             __FUNCTION__, xfer->aframes, xfer->nframes);
2731                 } else {
2732                         /* just set some valid value */
2733                         xfer->aframes = xfer->nframes;
2734                 }
2735         }
2736         /* compute actual length */
2737         xfer->actlen = 0;
2738
2739         for (x = 0; x != xfer->aframes; x++) {
2740                 xfer->actlen += xfer->frlengths[x];
2741         }
2742
2743         /*
2744          * Frames that were not transferred get zero actual length in
2745          * case the USB device driver does not check the actual number
2746          * of frames transferred, "xfer->aframes":
2747          */
2748         for (; x < xfer->nframes; x++) {
2749                 usbd_xfer_set_frame_len(xfer, x, 0);
2750         }
2751
2752         /* check actual length */
2753         if (xfer->actlen > xfer->sumlen) {
2754                 if (xfer->error == 0) {
2755                         panic("%s: actual length, %d, is greater than "
2756                             "initial length, %d\n",
2757                             __FUNCTION__, xfer->actlen, xfer->sumlen);
2758                 } else {
2759                         /* just set some valid value */
2760                         xfer->actlen = xfer->sumlen;
2761                 }
2762         }
2763         DPRINTFN(1, "xfer=%p endpoint=%p sts=%d alen=%d, slen=%d, afrm=%d, nfrm=%d\n",
2764             xfer, xfer->endpoint, xfer->error, xfer->actlen, xfer->sumlen,
2765             xfer->aframes, xfer->nframes);
2766
2767         if (xfer->error) {
2768                 /* end of control transfer, if any */
2769                 xfer->flags_int.control_act = 0;
2770
2771                 /* check if we should block the execution queue */
2772                 if ((xfer->error != USB_ERR_CANCELLED) &&
2773                     (xfer->flags.pipe_bof)) {
2774                         DPRINTFN(2, "xfer=%p: Block On Failure "
2775                             "on endpoint=%p\n", xfer, xfer->endpoint);
2776                         goto done;
2777                 }
2778         } else {
2779                 /* check for short transfers */
2780                 if (xfer->actlen < xfer->sumlen) {
2781
2782                         /* end of control transfer, if any */
2783                         xfer->flags_int.control_act = 0;
2784
2785                         if (!xfer->flags_int.short_xfer_ok) {
2786                                 xfer->error = USB_ERR_SHORT_XFER;
2787                                 if (xfer->flags.pipe_bof) {
2788                                         DPRINTFN(2, "xfer=%p: Block On Failure on "
2789                                             "Short Transfer on endpoint %p.\n",
2790                                             xfer, xfer->endpoint);
2791                                         goto done;
2792                                 }
2793                         }
2794                 } else {
2795                         /*
2796                          * Check if we are in the middle of a
2797                          * control transfer:
2798                          */
2799                         if (xfer->flags_int.control_act) {
2800                                 DPRINTFN(5, "xfer=%p: Control transfer "
2801                                     "active on endpoint=%p\n", xfer, xfer->endpoint);
2802                                 goto done;
2803                         }
2804                 }
2805         }
2806
2807         ep = xfer->endpoint;
2808
2809         /*
2810          * If the current USB transfer is completing we need to start the
2811          * next one:
2812          */
2813         USB_BUS_LOCK(bus);
2814         if (ep->endpoint_q.curr == xfer) {
2815                 usb_command_wrapper(&ep->endpoint_q, NULL);
2816
2817                 if (ep->endpoint_q.curr || TAILQ_FIRST(&ep->endpoint_q.head)) {
2818                         /* there is another USB transfer waiting */
2819                 } else {
2820                         /* this is the last USB transfer */
2821                         /* clear isochronous sync flag */
2822                         xfer->endpoint->is_synced = 0;
2823                 }
2824         }
2825         USB_BUS_UNLOCK(bus);
2826 done:
2827         return (0);
2828 }
2829
2830 /*------------------------------------------------------------------------*
2831  *      usb_command_wrapper
2832  *
2833  * This function is used to execute commands non-recursivly on an USB
2834  * transfer.
2835  *------------------------------------------------------------------------*/
2836 void
2837 usb_command_wrapper(struct usb_xfer_queue *pq, struct usb_xfer *xfer)
2838 {
2839         if (xfer) {
2840                 /*
2841                  * If the transfer is not already processing,
2842                  * queue it!
2843                  */
2844                 if (pq->curr != xfer) {
2845                         usbd_transfer_enqueue(pq, xfer);
2846                         if (pq->curr != NULL) {
2847                                 /* something is already processing */
2848                                 DPRINTFN(6, "busy %p\n", pq->curr);
2849                                 return;
2850                         }
2851                 }
2852         } else {
2853                 /* Get next element in queue */
2854                 pq->curr = NULL;
2855         }
2856
2857         if (!pq->recurse_1) {
2858
2859                 do {
2860
2861                         /* set both recurse flags */
2862                         pq->recurse_1 = 1;
2863                         pq->recurse_2 = 1;
2864
2865                         if (pq->curr == NULL) {
2866                                 xfer = TAILQ_FIRST(&pq->head);
2867                                 if (xfer) {
2868                                         TAILQ_REMOVE(&pq->head, xfer,
2869                                             wait_entry);
2870                                         xfer->wait_queue = NULL;
2871                                         pq->curr = xfer;
2872                                 } else {
2873                                         break;
2874                                 }
2875                         }
2876                         DPRINTFN(6, "cb %p (enter)\n", pq->curr);
2877                         (pq->command) (pq);
2878                         DPRINTFN(6, "cb %p (leave)\n", pq->curr);
2879
2880                 } while (!pq->recurse_2);
2881
2882                 /* clear first recurse flag */
2883                 pq->recurse_1 = 0;
2884
2885         } else {
2886                 /* clear second recurse flag */
2887                 pq->recurse_2 = 0;
2888         }
2889 }
2890
2891 /*------------------------------------------------------------------------*
2892  *      usbd_ctrl_transfer_setup
2893  *
2894  * This function is used to setup the default USB control endpoint
2895  * transfer.
2896  *------------------------------------------------------------------------*/
2897 void
2898 usbd_ctrl_transfer_setup(struct usb_device *udev)
2899 {
2900         struct usb_xfer *xfer;
2901         uint8_t no_resetup;
2902         uint8_t iface_index;
2903
2904         /* check for root HUB */
2905         if (udev->parent_hub == NULL)
2906                 return;
2907 repeat:
2908
2909         xfer = udev->ctrl_xfer[0];
2910         if (xfer) {
2911                 USB_XFER_LOCK(xfer);
2912                 no_resetup =
2913                     ((xfer->address == udev->address) &&
2914                     (udev->ctrl_ep_desc.wMaxPacketSize[0] ==
2915                     udev->ddesc.bMaxPacketSize));
2916                 if (udev->flags.usb_mode == USB_MODE_DEVICE) {
2917                         if (no_resetup) {
2918                                 /*
2919                                  * NOTE: checking "xfer->address" and
2920                                  * starting the USB transfer must be
2921                                  * atomic!
2922                                  */
2923                                 usbd_transfer_start(xfer);
2924                         }
2925                 }
2926                 USB_XFER_UNLOCK(xfer);
2927         } else {
2928                 no_resetup = 0;
2929         }
2930
2931         if (no_resetup) {
2932                 /*
2933                  * All parameters are exactly the same like before.
2934                  * Just return.
2935                  */
2936                 return;
2937         }
2938         /*
2939          * Update wMaxPacketSize for the default control endpoint:
2940          */
2941         udev->ctrl_ep_desc.wMaxPacketSize[0] =
2942             udev->ddesc.bMaxPacketSize;
2943
2944         /*
2945          * Unsetup any existing USB transfer:
2946          */
2947         usbd_transfer_unsetup(udev->ctrl_xfer, USB_CTRL_XFER_MAX);
2948
2949         /*
2950          * Reset clear stall error counter.
2951          */
2952         udev->clear_stall_errors = 0;
2953
2954         /*
2955          * Try to setup a new USB transfer for the
2956          * default control endpoint:
2957          */
2958         iface_index = 0;
2959         if (usbd_transfer_setup(udev, &iface_index,
2960             udev->ctrl_xfer, usb_control_ep_cfg, USB_CTRL_XFER_MAX, NULL,
2961             &udev->device_mtx)) {
2962                 DPRINTFN(0, "could not setup default "
2963                     "USB transfer\n");
2964         } else {
2965                 goto repeat;
2966         }
2967 }
2968
2969 /*------------------------------------------------------------------------*
2970  *      usbd_clear_data_toggle - factored out code
2971  *
2972  * NOTE: the intention of this function is not to reset the hardware
2973  * data toggle.
2974  *------------------------------------------------------------------------*/
2975 void
2976 usbd_clear_stall_locked(struct usb_device *udev, struct usb_endpoint *ep)
2977 {
2978         USB_BUS_LOCK_ASSERT(udev->bus, MA_OWNED);
2979
2980         /* check that we have a valid case */
2981         if (udev->flags.usb_mode == USB_MODE_HOST &&
2982             udev->parent_hub != NULL &&
2983             udev->bus->methods->clear_stall != NULL &&
2984             ep->methods != NULL) {
2985                 (udev->bus->methods->clear_stall) (udev, ep);
2986         }
2987 }
2988
2989 /*------------------------------------------------------------------------*
2990  *      usbd_clear_data_toggle - factored out code
2991  *
2992  * NOTE: the intention of this function is not to reset the hardware
2993  * data toggle on the USB device side.
2994  *------------------------------------------------------------------------*/
2995 void
2996 usbd_clear_data_toggle(struct usb_device *udev, struct usb_endpoint *ep)
2997 {
2998         DPRINTFN(5, "udev=%p endpoint=%p\n", udev, ep);
2999
3000         USB_BUS_LOCK(udev->bus);
3001         ep->toggle_next = 0;
3002         /* some hardware needs a callback to clear the data toggle */
3003         usbd_clear_stall_locked(udev, ep);
3004         USB_BUS_UNLOCK(udev->bus);
3005 }
3006
3007 /*------------------------------------------------------------------------*
3008  *      usbd_clear_stall_callback - factored out clear stall callback
3009  *
3010  * Input parameters:
3011  *  xfer1: Clear Stall Control Transfer
3012  *  xfer2: Stalled USB Transfer
3013  *
3014  * This function is NULL safe.
3015  *
3016  * Return values:
3017  *   0: In progress
3018  *   Else: Finished
3019  *
3020  * Clear stall config example:
3021  *
3022  * static const struct usb_config my_clearstall =  {
3023  *      .type = UE_CONTROL,
3024  *      .endpoint = 0,
3025  *      .direction = UE_DIR_ANY,
3026  *      .interval = 50, //50 milliseconds
3027  *      .bufsize = sizeof(struct usb_device_request),
3028  *      .timeout = 1000, //1.000 seconds
3029  *      .callback = &my_clear_stall_callback, // **
3030  *      .usb_mode = USB_MODE_HOST,
3031  * };
3032  *
3033  * ** "my_clear_stall_callback" calls "usbd_clear_stall_callback"
3034  * passing the correct parameters.
3035  *------------------------------------------------------------------------*/
3036 uint8_t
3037 usbd_clear_stall_callback(struct usb_xfer *xfer1,
3038     struct usb_xfer *xfer2)
3039 {
3040         struct usb_device_request req;
3041
3042         if (xfer2 == NULL) {
3043                 /* looks like we are tearing down */
3044                 DPRINTF("NULL input parameter\n");
3045                 return (0);
3046         }
3047         USB_XFER_LOCK_ASSERT(xfer1, MA_OWNED);
3048         USB_XFER_LOCK_ASSERT(xfer2, MA_OWNED);
3049
3050         switch (USB_GET_STATE(xfer1)) {
3051         case USB_ST_SETUP:
3052
3053                 /*
3054                  * pre-clear the data toggle to DATA0 ("umass.c" and
3055                  * "ata-usb.c" depends on this)
3056                  */
3057
3058                 usbd_clear_data_toggle(xfer2->xroot->udev, xfer2->endpoint);
3059
3060                 /* setup a clear-stall packet */
3061
3062                 req.bmRequestType = UT_WRITE_ENDPOINT;
3063                 req.bRequest = UR_CLEAR_FEATURE;
3064                 USETW(req.wValue, UF_ENDPOINT_HALT);
3065                 req.wIndex[0] = xfer2->endpoint->edesc->bEndpointAddress;
3066                 req.wIndex[1] = 0;
3067                 USETW(req.wLength, 0);
3068
3069                 /*
3070                  * "usbd_transfer_setup_sub()" will ensure that
3071                  * we have sufficient room in the buffer for
3072                  * the request structure!
3073                  */
3074
3075                 /* copy in the transfer */
3076
3077                 usbd_copy_in(xfer1->frbuffers, 0, &req, sizeof(req));
3078
3079                 /* set length */
3080                 xfer1->frlengths[0] = sizeof(req);
3081                 xfer1->nframes = 1;
3082
3083                 usbd_transfer_submit(xfer1);
3084                 return (0);
3085
3086         case USB_ST_TRANSFERRED:
3087                 break;
3088
3089         default:                        /* Error */
3090                 if (xfer1->error == USB_ERR_CANCELLED) {
3091                         return (0);
3092                 }
3093                 break;
3094         }
3095         return (1);                     /* Clear Stall Finished */
3096 }
3097
3098 /*------------------------------------------------------------------------*
3099  *      usbd_transfer_poll
3100  *
3101  * The following function gets called from the USB keyboard driver and
3102  * UMASS when the system has paniced.
3103  *
3104  * NOTE: It is currently not possible to resume normal operation on
3105  * the USB controller which has been polled, due to clearing of the
3106  * "up_dsleep" and "up_msleep" flags.
3107  *------------------------------------------------------------------------*/
3108 void
3109 usbd_transfer_poll(struct usb_xfer **ppxfer, uint16_t max)
3110 {
3111         struct usb_xfer *xfer;
3112         struct usb_xfer_root *xroot;
3113         struct usb_device *udev;
3114         struct usb_proc_msg *pm;
3115         uint16_t n;
3116         uint16_t drop_bus;
3117         uint16_t drop_xfer;
3118
3119         for (n = 0; n != max; n++) {
3120                 /* Extra checks to avoid panic */
3121                 xfer = ppxfer[n];
3122                 if (xfer == NULL)
3123                         continue;       /* no USB transfer */
3124                 xroot = xfer->xroot;
3125                 if (xroot == NULL)
3126                         continue;       /* no USB root */
3127                 udev = xroot->udev;
3128                 if (udev == NULL)
3129                         continue;       /* no USB device */
3130                 if (udev->bus == NULL)
3131                         continue;       /* no BUS structure */
3132                 if (udev->bus->methods == NULL)
3133                         continue;       /* no BUS methods */
3134                 if (udev->bus->methods->xfer_poll == NULL)
3135                         continue;       /* no poll method */
3136
3137                 /* make sure that the BUS mutex is not locked */
3138                 drop_bus = 0;
3139                 while (mtx_owned(&xroot->udev->bus->bus_mtx) && !SCHEDULER_STOPPED()) {
3140                         mtx_unlock(&xroot->udev->bus->bus_mtx);
3141                         drop_bus++;
3142                 }
3143
3144                 /* make sure that the transfer mutex is not locked */
3145                 drop_xfer = 0;
3146                 while (mtx_owned(xroot->xfer_mtx) && !SCHEDULER_STOPPED()) {
3147                         mtx_unlock(xroot->xfer_mtx);
3148                         drop_xfer++;
3149                 }
3150
3151                 /* Make sure cv_signal() and cv_broadcast() is not called */
3152                 udev->bus->control_xfer_proc.up_msleep = 0;
3153                 udev->bus->explore_proc.up_msleep = 0;
3154                 udev->bus->giant_callback_proc.up_msleep = 0;
3155                 udev->bus->non_giant_callback_proc.up_msleep = 0;
3156
3157                 /* poll USB hardware */
3158                 (udev->bus->methods->xfer_poll) (udev->bus);
3159
3160                 USB_BUS_LOCK(xroot->bus);
3161
3162                 /* check for clear stall */
3163                 if (udev->ctrl_xfer[1] != NULL) {
3164
3165                         /* poll clear stall start */
3166                         pm = &udev->cs_msg[0].hdr;
3167                         (pm->pm_callback) (pm);
3168                         /* poll clear stall done thread */
3169                         pm = &udev->ctrl_xfer[1]->
3170                             xroot->done_m[0].hdr;
3171                         (pm->pm_callback) (pm);
3172                 }
3173
3174                 /* poll done thread */
3175                 pm = &xroot->done_m[0].hdr;
3176                 (pm->pm_callback) (pm);
3177
3178                 USB_BUS_UNLOCK(xroot->bus);
3179
3180                 /* restore transfer mutex */
3181                 while (drop_xfer--)
3182                         mtx_lock(xroot->xfer_mtx);
3183
3184                 /* restore BUS mutex */
3185                 while (drop_bus--)
3186                         mtx_lock(&xroot->udev->bus->bus_mtx);
3187         }
3188 }
3189
3190 static void
3191 usbd_get_std_packet_size(struct usb_std_packet_size *ptr,
3192     uint8_t type, enum usb_dev_speed speed)
3193 {
3194         static const uint16_t intr_range_max[USB_SPEED_MAX] = {
3195                 [USB_SPEED_LOW] = 8,
3196                 [USB_SPEED_FULL] = 64,
3197                 [USB_SPEED_HIGH] = 1024,
3198                 [USB_SPEED_VARIABLE] = 1024,
3199                 [USB_SPEED_SUPER] = 1024,
3200         };
3201
3202         static const uint16_t isoc_range_max[USB_SPEED_MAX] = {
3203                 [USB_SPEED_LOW] = 0,    /* invalid */
3204                 [USB_SPEED_FULL] = 1023,
3205                 [USB_SPEED_HIGH] = 1024,
3206                 [USB_SPEED_VARIABLE] = 3584,
3207                 [USB_SPEED_SUPER] = 1024,
3208         };
3209
3210         static const uint16_t control_min[USB_SPEED_MAX] = {
3211                 [USB_SPEED_LOW] = 8,
3212                 [USB_SPEED_FULL] = 8,
3213                 [USB_SPEED_HIGH] = 64,
3214                 [USB_SPEED_VARIABLE] = 512,
3215                 [USB_SPEED_SUPER] = 512,
3216         };
3217
3218         static const uint16_t bulk_min[USB_SPEED_MAX] = {
3219                 [USB_SPEED_LOW] = 8,
3220                 [USB_SPEED_FULL] = 8,
3221                 [USB_SPEED_HIGH] = 512,
3222                 [USB_SPEED_VARIABLE] = 512,
3223                 [USB_SPEED_SUPER] = 1024,
3224         };
3225
3226         uint16_t temp;
3227
3228         memset(ptr, 0, sizeof(*ptr));
3229
3230         switch (type) {
3231         case UE_INTERRUPT:
3232                 ptr->range.max = intr_range_max[speed];
3233                 break;
3234         case UE_ISOCHRONOUS:
3235                 ptr->range.max = isoc_range_max[speed];
3236                 break;
3237         default:
3238                 if (type == UE_BULK)
3239                         temp = bulk_min[speed];
3240                 else /* UE_CONTROL */
3241                         temp = control_min[speed];
3242
3243                 /* default is fixed */
3244                 ptr->fixed[0] = temp;
3245                 ptr->fixed[1] = temp;
3246                 ptr->fixed[2] = temp;
3247                 ptr->fixed[3] = temp;
3248
3249                 if (speed == USB_SPEED_FULL) {
3250                         /* multiple sizes */
3251                         ptr->fixed[1] = 16;
3252                         ptr->fixed[2] = 32;
3253                         ptr->fixed[3] = 64;
3254                 }
3255                 if ((speed == USB_SPEED_VARIABLE) &&
3256                     (type == UE_BULK)) {
3257                         /* multiple sizes */
3258                         ptr->fixed[2] = 1024;
3259                         ptr->fixed[3] = 1536;
3260                 }
3261                 break;
3262         }
3263 }
3264
3265 void    *
3266 usbd_xfer_softc(struct usb_xfer *xfer)
3267 {
3268         return (xfer->priv_sc);
3269 }
3270
3271 void *
3272 usbd_xfer_get_priv(struct usb_xfer *xfer)
3273 {
3274         return (xfer->priv_fifo);
3275 }
3276
3277 void
3278 usbd_xfer_set_priv(struct usb_xfer *xfer, void *ptr)
3279 {
3280         xfer->priv_fifo = ptr;
3281 }
3282
3283 uint8_t
3284 usbd_xfer_state(struct usb_xfer *xfer)
3285 {
3286         return (xfer->usb_state);
3287 }
3288
3289 void
3290 usbd_xfer_set_flag(struct usb_xfer *xfer, int flag)
3291 {
3292         switch (flag) {
3293                 case USB_FORCE_SHORT_XFER:
3294                         xfer->flags.force_short_xfer = 1;
3295                         break;
3296                 case USB_SHORT_XFER_OK:
3297                         xfer->flags.short_xfer_ok = 1;
3298                         break;
3299                 case USB_MULTI_SHORT_OK:
3300                         xfer->flags.short_frames_ok = 1;
3301                         break;
3302                 case USB_MANUAL_STATUS:
3303                         xfer->flags.manual_status = 1;
3304                         break;
3305         }
3306 }
3307
3308 void
3309 usbd_xfer_clr_flag(struct usb_xfer *xfer, int flag)
3310 {
3311         switch (flag) {
3312                 case USB_FORCE_SHORT_XFER:
3313                         xfer->flags.force_short_xfer = 0;
3314                         break;
3315                 case USB_SHORT_XFER_OK:
3316                         xfer->flags.short_xfer_ok = 0;
3317                         break;
3318                 case USB_MULTI_SHORT_OK:
3319                         xfer->flags.short_frames_ok = 0;
3320                         break;
3321                 case USB_MANUAL_STATUS:
3322                         xfer->flags.manual_status = 0;
3323                         break;
3324         }
3325 }
3326
3327 /*
3328  * The following function returns in milliseconds when the isochronous
3329  * transfer was completed by the hardware. The returned value wraps
3330  * around 65536 milliseconds.
3331  */
3332 uint16_t
3333 usbd_xfer_get_timestamp(struct usb_xfer *xfer)
3334 {
3335         return (xfer->isoc_time_complete);
3336 }