Pileus Git - ~andy/linux/blob - drivers/usb/storage/uas.c

   1 /*
   2  * USB Attached SCSI
   3  * Note that this is not the same as the USB Mass Storage driver
   4  *
   5  * Copyright Matthew Wilcox for Intel Corp, 2010
   6  * Copyright Sarah Sharp for Intel Corp, 2010
   7  *
   8  * Distributed under the terms of the GNU GPL, version two.
   9  */
  10
  11 #include <linux/blkdev.h>
  12 #include <linux/slab.h>
  13 #include <linux/types.h>
  14 #include <linux/module.h>
  15 #include <linux/usb.h>
  16 #include <linux/usb/hcd.h>
  17 #include <linux/usb/storage.h>
  18 #include <linux/usb/uas.h>
  19
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_dbg.h>
  22 #include <scsi/scsi_cmnd.h>
  23 #include <scsi/scsi_device.h>
  24 #include <scsi/scsi_host.h>
  25 #include <scsi/scsi_tcq.h>
  26
  27 /*
  28  * The r00-r01c specs define this version of the SENSE IU data structure.
  29  * It's still in use by several different firmware releases.
  30  */
  31 struct sense_iu_old {
  32         __u8 iu_id;
  33         __u8 rsvd1;
  34         __be16 tag;
  35         __be16 len;
  36         __u8 status;
  37         __u8 service_response;
  38         __u8 sense[SCSI_SENSE_BUFFERSIZE];
  39 };
  40
  41 struct uas_dev_info {
  42         struct usb_interface *intf;
  43         struct usb_device *udev;
  44         struct usb_anchor sense_urbs;
  45         struct usb_anchor data_urbs;
  46         int qdepth, resetting;
  47         struct response_ui response;
  48         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  49         unsigned use_streams:1;
  50         unsigned uas_sense_old:1;
  51         struct scsi_cmnd *cmnd;
  52 };
  53
  54 enum {
  55         SUBMIT_STATUS_URB       = (1 << 1),
  56         ALLOC_DATA_IN_URB       = (1 << 2),
  57         SUBMIT_DATA_IN_URB      = (1 << 3),
  58         ALLOC_DATA_OUT_URB      = (1 << 4),
  59         SUBMIT_DATA_OUT_URB     = (1 << 5),
  60         ALLOC_CMD_URB           = (1 << 6),
  61         SUBMIT_CMD_URB          = (1 << 7),
  62         COMMAND_INFLIGHT        = (1 << 8),
  63         DATA_IN_URB_INFLIGHT    = (1 << 9),
  64         DATA_OUT_URB_INFLIGHT   = (1 << 10),
  65         COMMAND_COMPLETED       = (1 << 11),
  66 };
  67
  68 /* Overrides scsi_pointer */
  69 struct uas_cmd_info {
  70         unsigned int state;
  71         unsigned int stream;
  72         unsigned int aborted;
  73         struct urb *cmd_urb;
  74         struct urb *data_in_urb;
  75         struct urb *data_out_urb;
  76         struct list_head list;
  77 };
  78
  79 /* I hate forward declarations, but I actually have a loop */
  80 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  81                                 struct uas_dev_info *devinfo, gfp_t gfp);
  82 static void uas_do_work(struct work_struct *work);
  83
  84 static DECLARE_WORK(uas_work, uas_do_work);
  85 static DEFINE_SPINLOCK(uas_work_lock);
  86 static LIST_HEAD(uas_work_list);
  87
  88 static void uas_do_work(struct work_struct *work)
  89 {
  90         struct uas_cmd_info *cmdinfo;
  91         struct uas_cmd_info *temp;
  92         struct list_head list;
  93         int err;
  94
  95         spin_lock_irq(&uas_work_lock);
  96         list_replace_init(&uas_work_list, &list);
  97         spin_unlock_irq(&uas_work_lock);
  98
  99         list_for_each_entry_safe(cmdinfo, temp, &list, list) {
 100                 struct scsi_pointer *scp = (void *)cmdinfo;
 101                 struct scsi_cmnd *cmnd = container_of(scp,
 102                                                         struct scsi_cmnd, SCp);
 103                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_NOIO);
 104                 if (err) {
 105                         list_del(&cmdinfo->list);
 106                         spin_lock_irq(&uas_work_lock);
 107                         list_add_tail(&cmdinfo->list, &uas_work_list);
 108                         spin_unlock_irq(&uas_work_lock);
 109                         schedule_work(&uas_work);
 110                 }
 111         }
 112 }
 113
 114 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 115 {
 116         struct sense_iu *sense_iu = urb->transfer_buffer;
 117         struct scsi_device *sdev = cmnd->device;
 118
 119         if (urb->actual_length > 16) {
 120                 unsigned len = be16_to_cpup(&sense_iu->len);
 121                 if (len + 16 != urb->actual_length) {
 122                         int newlen = min(len + 16, urb->actual_length) - 16;
 123                         if (newlen < 0)
 124                                 newlen = 0;
 125                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 126                                 "disagrees with IU sense data length %d, "
 127                                 "using %d bytes of sense data\n", __func__,
 128                                         urb->actual_length, len, newlen);
 129                         len = newlen;
 130                 }
 131                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 132         }
 133
 134         cmnd->result = sense_iu->status;
 135 }
 136
 137 static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
 138 {
 139         struct sense_iu_old *sense_iu = urb->transfer_buffer;
 140         struct scsi_device *sdev = cmnd->device;
 141
 142         if (urb->actual_length > 8) {
 143                 unsigned len = be16_to_cpup(&sense_iu->len) - 2;
 144                 if (len + 8 != urb->actual_length) {
 145                         int newlen = min(len + 8, urb->actual_length) - 8;
 146                         if (newlen < 0)
 147                                 newlen = 0;
 148                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 149                                 "disagrees with IU sense data length %d, "
 150                                 "using %d bytes of sense data\n", __func__,
 151                                         urb->actual_length, len, newlen);
 152                         len = newlen;
 153                 }
 154                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 155         }
 156
 157         cmnd->result = sense_iu->status;
 158 }
 159
 160 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *caller)
 161 {
 162         struct uas_cmd_info *ci = (void *)&cmnd->SCp;
 163
 164         scmd_printk(KERN_INFO, cmnd, "%s %p tag %d, inflight:"
 165                     "%s%s%s%s%s%s%s%s%s%s%s\n",
 166                     caller, cmnd, cmnd->request->tag,
 167                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 168                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 169                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 170                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 171                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 172                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 173                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 174                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 175                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 176                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 177                     (ci->state & COMMAND_COMPLETED)     ? " done"  : "");
 178 }
 179
 180 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 181 {
 182         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 183
 184         if (cmdinfo->state & (COMMAND_INFLIGHT |
 185                               DATA_IN_URB_INFLIGHT |
 186                               DATA_OUT_URB_INFLIGHT))
 187                 return -EBUSY;
 188         BUG_ON(cmdinfo->state & COMMAND_COMPLETED);
 189         cmdinfo->state |= COMMAND_COMPLETED;
 190         usb_free_urb(cmdinfo->data_in_urb);
 191         usb_free_urb(cmdinfo->data_out_urb);
 192         cmnd->scsi_done(cmnd);
 193         return 0;
 194 }
 195
 196 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 197                           unsigned direction)
 198 {
 199         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 200         int err;
 201
 202         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 203         err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
 204         if (err) {
 205                 spin_lock(&uas_work_lock);
 206                 list_add_tail(&cmdinfo->list, &uas_work_list);
 207                 spin_unlock(&uas_work_lock);
 208                 schedule_work(&uas_work);
 209         }
 210 }
 211
 212 static void uas_stat_cmplt(struct urb *urb)
 213 {
 214         struct iu *iu = urb->transfer_buffer;
 215         struct Scsi_Host *shost = urb->context;
 216         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
 217         struct scsi_cmnd *cmnd;
 218         struct uas_cmd_info *cmdinfo;
 219         u16 tag;
 220
 221         if (urb->status) {
 222                 dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status);
 223                 usb_free_urb(urb);
 224                 return;
 225         }
 226
 227         if (devinfo->resetting) {
 228                 usb_free_urb(urb);
 229                 return;
 230         }
 231
 232         tag = be16_to_cpup(&iu->tag) - 1;
 233         if (tag == 0)
 234                 cmnd = devinfo->cmnd;
 235         else
 236                 cmnd = scsi_host_find_tag(shost, tag - 1);
 237         if (!cmnd) {
 238                 if (iu->iu_id != IU_ID_RESPONSE) {
 239                         usb_free_urb(urb);
 240                         return;
 241                 }
 242         } else {
 243                 cmdinfo = (void *)&cmnd->SCp;
 244         }
 245
 246         switch (iu->iu_id) {
 247         case IU_ID_STATUS:
 248                 if (devinfo->cmnd == cmnd)
 249                         devinfo->cmnd = NULL;
 250
 251                 if (urb->actual_length < 16)
 252                         devinfo->uas_sense_old = 1;
 253                 if (devinfo->uas_sense_old)
 254                         uas_sense_old(urb, cmnd);
 255                 else
 256                         uas_sense(urb, cmnd);
 257                 if (cmnd->result != 0) {
 258                         /* cancel data transfers on error */
 259                         if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
 260                                 usb_unlink_urb(cmdinfo->data_in_urb);
 261                         if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
 262                                 usb_unlink_urb(cmdinfo->data_out_urb);
 263                 }
 264                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 265                 uas_try_complete(cmnd, __func__);
 266                 break;
 267         case IU_ID_READ_READY:
 268                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 269                 break;
 270         case IU_ID_WRITE_READY:
 271                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 272                 break;
 273         case IU_ID_RESPONSE:
 274                 /* store results for uas_eh_task_mgmt() */
 275                 memcpy(&devinfo->response, iu, sizeof(devinfo->response));
 276                 break;
 277         default:
 278                 scmd_printk(KERN_ERR, cmnd,
 279                         "Bogus IU (%d) received on status pipe\n", iu->iu_id);
 280         }
 281         usb_free_urb(urb);
 282 }
 283
 284 static void uas_data_cmplt(struct urb *urb)
 285 {
 286         struct scsi_cmnd *cmnd = urb->context;
 287         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 288         struct scsi_data_buffer *sdb = NULL;
 289
 290         if (cmdinfo->data_in_urb == urb) {
 291                 sdb = scsi_in(cmnd);
 292                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 293         } else if (cmdinfo->data_out_urb == urb) {
 294                 sdb = scsi_out(cmnd);
 295                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 296         }
 297         BUG_ON(sdb == NULL);
 298         if (urb->status) {
 299                 /* error: no data transfered */
 300                 sdb->resid = sdb->length;
 301         } else {
 302                 sdb->resid = sdb->length - urb->actual_length;
 303         }
 304         if (cmdinfo->aborted) {
 305                 return;
 306         }
 307         uas_try_complete(cmnd, __func__);
 308 }
 309
 310 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 311                                       unsigned int pipe, u16 stream_id,
 312                                       struct scsi_cmnd *cmnd,
 313                                       enum dma_data_direction dir)
 314 {
 315         struct usb_device *udev = devinfo->udev;
 316         struct urb *urb = usb_alloc_urb(0, gfp);
 317         struct scsi_data_buffer *sdb = (dir == DMA_FROM_DEVICE)
 318                 ? scsi_in(cmnd) : scsi_out(cmnd);
 319
 320         if (!urb)
 321                 goto out;
 322         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 323                           uas_data_cmplt, cmnd);
 324         if (devinfo->use_streams)
 325                 urb->stream_id = stream_id;
 326         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 327         urb->sg = sdb->table.sgl;
 328  out:
 329         return urb;
 330 }
 331
 332 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 333                                        struct Scsi_Host *shost, u16 stream_id)
 334 {
 335         struct usb_device *udev = devinfo->udev;
 336         struct urb *urb = usb_alloc_urb(0, gfp);
 337         struct sense_iu *iu;
 338
 339         if (!urb)
 340                 goto out;
 341
 342         iu = kzalloc(sizeof(*iu), gfp);
 343         if (!iu)
 344                 goto free;
 345
 346         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 347                                                 uas_stat_cmplt, shost);
 348         urb->stream_id = stream_id;
 349         urb->transfer_flags |= URB_FREE_BUFFER;
 350  out:
 351         return urb;
 352  free:
 353         usb_free_urb(urb);
 354         return NULL;
 355 }
 356
 357 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 358                                         struct scsi_cmnd *cmnd, u16 stream_id)
 359 {
 360         struct usb_device *udev = devinfo->udev;
 361         struct scsi_device *sdev = cmnd->device;
 362         struct urb *urb = usb_alloc_urb(0, gfp);
 363         struct command_iu *iu;
 364         int len;
 365
 366         if (!urb)
 367                 goto out;
 368
 369         len = cmnd->cmd_len - 16;
 370         if (len < 0)
 371                 len = 0;
 372         len = ALIGN(len, 4);
 373         iu = kzalloc(sizeof(*iu) + len, gfp);
 374         if (!iu)
 375                 goto free;
 376
 377         iu->iu_id = IU_ID_COMMAND;
 378         if (blk_rq_tagged(cmnd->request))
 379                 iu->tag = cpu_to_be16(cmnd->request->tag + 2);
 380         else
 381                 iu->tag = cpu_to_be16(1);
 382         iu->prio_attr = UAS_SIMPLE_TAG;
 383         iu->len = len;
 384         int_to_scsilun(sdev->lun, &iu->lun);
 385         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 386
 387         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 388                                                         usb_free_urb, NULL);
 389         urb->transfer_flags |= URB_FREE_BUFFER;
 390  out:
 391         return urb;
 392  free:
 393         usb_free_urb(urb);
 394         return NULL;
 395 }
 396
 397 static int uas_submit_task_urb(struct scsi_cmnd *cmnd, gfp_t gfp,
 398                                u8 function, u16 stream_id)
 399 {
 400         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 401         struct usb_device *udev = devinfo->udev;
 402         struct urb *urb = usb_alloc_urb(0, gfp);
 403         struct task_mgmt_iu *iu;
 404         int err = -ENOMEM;
 405
 406         if (!urb)
 407                 goto err;
 408
 409         iu = kzalloc(sizeof(*iu), gfp);
 410         if (!iu)
 411                 goto err;
 412
 413         iu->iu_id = IU_ID_TASK_MGMT;
 414         iu->tag = cpu_to_be16(stream_id);
 415         int_to_scsilun(cmnd->device->lun, &iu->lun);
 416
 417         iu->function = function;
 418         switch (function) {
 419         case TMF_ABORT_TASK:
 420                 if (blk_rq_tagged(cmnd->request))
 421                         iu->task_tag = cpu_to_be16(cmnd->request->tag + 2);
 422                 else
 423                         iu->task_tag = cpu_to_be16(1);
 424                 break;
 425         }
 426
 427         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu),
 428                           usb_free_urb, NULL);
 429         urb->transfer_flags |= URB_FREE_BUFFER;
 430
 431         err = usb_submit_urb(urb, gfp);
 432         if (err)
 433                 goto err;
 434
 435         return 0;
 436
 437 err:
 438         usb_free_urb(urb);
 439         return err;
 440 }
 441
 442 /*
 443  * Why should I request the Status IU before sending the Command IU?  Spec
 444  * says to, but also says the device may receive them in any order.  Seems
 445  * daft to me.
 446  */
 447
 448 static int uas_submit_sense_urb(struct Scsi_Host *shost,
 449                                 gfp_t gfp, unsigned int stream)
 450 {
 451         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
 452         struct urb *urb;
 453
 454         urb = uas_alloc_sense_urb(devinfo, gfp, shost, stream);
 455         if (!urb)
 456                 return SCSI_MLQUEUE_DEVICE_BUSY;
 457         if (usb_submit_urb(urb, gfp)) {
 458                 shost_printk(KERN_INFO, shost,
 459                              "sense urb submission failure\n");
 460                 usb_free_urb(urb);
 461                 return SCSI_MLQUEUE_DEVICE_BUSY;
 462         }
 463         usb_anchor_urb(urb, &devinfo->sense_urbs);
 464         return 0;
 465 }
 466
 467 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 468                            struct uas_dev_info *devinfo, gfp_t gfp)
 469 {
 470         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 471         int err;
 472
 473         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 474                 err = uas_submit_sense_urb(cmnd->device->host, gfp,
 475                                            cmdinfo->stream);
 476                 if (err) {
 477                         return err;
 478                 }
 479                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 480         }
 481
 482         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 483                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
 484                                         devinfo->data_in_pipe, cmdinfo->stream,
 485                                         cmnd, DMA_FROM_DEVICE);
 486                 if (!cmdinfo->data_in_urb)
 487                         return SCSI_MLQUEUE_DEVICE_BUSY;
 488                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 489         }
 490
 491         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 492                 if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
 493                         scmd_printk(KERN_INFO, cmnd,
 494                                         "data in urb submission failure\n");
 495                         return SCSI_MLQUEUE_DEVICE_BUSY;
 496                 }
 497                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 498                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 499                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 500         }
 501
 502         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 503                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
 504                                         devinfo->data_out_pipe, cmdinfo->stream,
 505                                         cmnd, DMA_TO_DEVICE);
 506                 if (!cmdinfo->data_out_urb)
 507                         return SCSI_MLQUEUE_DEVICE_BUSY;
 508                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 509         }
 510
 511         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 512                 if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
 513                         scmd_printk(KERN_INFO, cmnd,
 514                                         "data out urb submission failure\n");
 515                         return SCSI_MLQUEUE_DEVICE_BUSY;
 516                 }
 517                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 518                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 519                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 520         }
 521
 522         if (cmdinfo->state & ALLOC_CMD_URB) {
 523                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd,
 524                                                         cmdinfo->stream);
 525                 if (!cmdinfo->cmd_urb)
 526                         return SCSI_MLQUEUE_DEVICE_BUSY;
 527                 cmdinfo->state &= ~ALLOC_CMD_URB;
 528         }
 529
 530         if (cmdinfo->state & SUBMIT_CMD_URB) {
 531                 if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
 532                         scmd_printk(KERN_INFO, cmnd,
 533                                         "cmd urb submission failure\n");
 534                         return SCSI_MLQUEUE_DEVICE_BUSY;
 535                 }
 536                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 537                 cmdinfo->state |= COMMAND_INFLIGHT;
 538         }
 539
 540         return 0;
 541 }
 542
 543 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
 544                                         void (*done)(struct scsi_cmnd *))
 545 {
 546         struct scsi_device *sdev = cmnd->device;
 547         struct uas_dev_info *devinfo = sdev->hostdata;
 548         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 549         int err;
 550
 551         BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
 552
 553         if (devinfo->cmnd)
 554                 return SCSI_MLQUEUE_DEVICE_BUSY;
 555
 556         if (blk_rq_tagged(cmnd->request)) {
 557                 cmdinfo->stream = cmnd->request->tag + 2;
 558         } else {
 559                 devinfo->cmnd = cmnd;
 560                 cmdinfo->stream = 1;
 561         }
 562
 563         cmnd->scsi_done = done;
 564
 565         cmdinfo->state = SUBMIT_STATUS_URB |
 566                         ALLOC_CMD_URB | SUBMIT_CMD_URB;
 567         cmdinfo->aborted = 0;
 568
 569         switch (cmnd->sc_data_direction) {
 570         case DMA_FROM_DEVICE:
 571                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 572                 break;
 573         case DMA_BIDIRECTIONAL:
 574                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 575         case DMA_TO_DEVICE:
 576                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 577         case DMA_NONE:
 578                 break;
 579         }
 580
 581         if (!devinfo->use_streams) {
 582                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 583                 cmdinfo->stream = 0;
 584         }
 585
 586         err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
 587         if (err) {
 588                 /* If we did nothing, give up now */
 589                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 590                         return SCSI_MLQUEUE_DEVICE_BUSY;
 591                 }
 592                 spin_lock(&uas_work_lock);
 593                 list_add_tail(&cmdinfo->list, &uas_work_list);
 594                 spin_unlock(&uas_work_lock);
 595                 schedule_work(&uas_work);
 596         }
 597
 598         return 0;
 599 }
 600
 601 static DEF_SCSI_QCMD(uas_queuecommand)
 602
 603 static int uas_eh_task_mgmt(struct scsi_cmnd *cmnd,
 604                             const char *fname, u8 function)
 605 {
 606         struct Scsi_Host *shost = cmnd->device->host;
 607         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
 608         u16 tag = 9999; /* FIXME */
 609
 610         memset(&devinfo->response, 0, sizeof(devinfo->response));
 611         if (uas_submit_sense_urb(shost, GFP_NOIO, tag)) {
 612                 shost_printk(KERN_INFO, shost,
 613                              "%s: %s: submit sense urb failed\n",
 614                              __func__, fname);
 615                 return FAILED;
 616         }
 617         if (uas_submit_task_urb(cmnd, GFP_NOIO, function, tag)) {
 618                 shost_printk(KERN_INFO, shost,
 619                              "%s: %s: submit task mgmt urb failed\n",
 620                              __func__, fname);
 621                 return FAILED;
 622         }
 623         if (0 == usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 3000)) {
 624                 shost_printk(KERN_INFO, shost,
 625                              "%s: %s timed out\n", __func__, fname);
 626                 return FAILED;
 627         }
 628         if (be16_to_cpu(devinfo->response.tag) != tag) {
 629                 shost_printk(KERN_INFO, shost,
 630                              "%s: %s failed (wrong tag %d/%d)\n", __func__,
 631                              fname, be16_to_cpu(devinfo->response.tag), tag);
 632                 return FAILED;
 633         }
 634         if (devinfo->response.response_code != RC_TMF_COMPLETE) {
 635                 shost_printk(KERN_INFO, shost,
 636                              "%s: %s failed (rc 0x%x)\n", __func__,
 637                              fname, devinfo->response.response_code);
 638                 return FAILED;
 639         }
 640         return SUCCESS;
 641 }
 642
 643 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
 644 {
 645         struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
 646         int ret;
 647
 648         uas_log_cmd_state(cmnd, __func__);
 649         cmdinfo->aborted = 1;
 650         ret = uas_eh_task_mgmt(cmnd, "ABORT TASK", TMF_ABORT_TASK);
 651         if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
 652                 usb_kill_urb(cmdinfo->data_in_urb);
 653         if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
 654                 usb_kill_urb(cmdinfo->data_out_urb);
 655         return ret;
 656 }
 657
 658 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
 659 {
 660         sdev_printk(KERN_INFO, cmnd->device, "%s\n", __func__);
 661         return uas_eh_task_mgmt(cmnd, "LOGICAL UNIT RESET",
 662                                 TMF_LOGICAL_UNIT_RESET);
 663 }
 664
 665 static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
 666 {
 667         struct scsi_device *sdev = cmnd->device;
 668         struct uas_dev_info *devinfo = sdev->hostdata;
 669         struct usb_device *udev = devinfo->udev;
 670         int err;
 671
 672         devinfo->resetting = 1;
 673         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 674         usb_kill_anchored_urbs(&devinfo->data_urbs);
 675         err = usb_reset_device(udev);
 676         devinfo->resetting = 0;
 677
 678         if (err) {
 679                 shost_printk(KERN_INFO, sdev->host, "%s FAILED\n", __func__);
 680                 return FAILED;
 681         }
 682
 683         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 684         return SUCCESS;
 685 }
 686
 687 static int uas_slave_alloc(struct scsi_device *sdev)
 688 {
 689         sdev->hostdata = (void *)sdev->host->hostdata[0];
 690         return 0;
 691 }
 692
 693 static int uas_slave_configure(struct scsi_device *sdev)
 694 {
 695         struct uas_dev_info *devinfo = sdev->hostdata;
 696         scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
 697         scsi_activate_tcq(sdev, devinfo->qdepth - 2);
 698         return 0;
 699 }
 700
 701 static struct scsi_host_template uas_host_template = {
 702         .module = THIS_MODULE,
 703         .name = "uas",
 704         .queuecommand = uas_queuecommand,
 705         .slave_alloc = uas_slave_alloc,
 706         .slave_configure = uas_slave_configure,
 707         .eh_abort_handler = uas_eh_abort_handler,
 708         .eh_device_reset_handler = uas_eh_device_reset_handler,
 709         .eh_bus_reset_handler = uas_eh_bus_reset_handler,
 710         .can_queue = 65536,     /* Is there a limit on the _host_ ? */
 711         .this_id = -1,
 712         .sg_tablesize = SG_NONE,
 713         .cmd_per_lun = 1,       /* until we override it */
 714         .skip_settle_delay = 1,
 715         .ordered_tag = 1,
 716 };
 717
 718 static struct usb_device_id uas_usb_ids[] = {
 719         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 720         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 721         /* 0xaa is a prototype device I happen to have access to */
 722         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
 723         { }
 724 };
 725 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 726
 727 static int uas_is_interface(struct usb_host_interface *intf)
 728 {
 729         return (intf->desc.bInterfaceClass == USB_CLASS_MASS_STORAGE &&
 730                 intf->desc.bInterfaceSubClass == USB_SC_SCSI &&
 731                 intf->desc.bInterfaceProtocol == USB_PR_UAS);
 732 }
 733
 734 static int uas_isnt_supported(struct usb_device *udev)
 735 {
 736         struct usb_hcd *hcd = bus_to_hcd(udev->bus);
 737
 738         dev_warn(&udev->dev, "The driver for the USB controller %s does not "
 739                         "support scatter-gather which is\n",
 740                         hcd->driver->description);
 741         dev_warn(&udev->dev, "required by the UAS driver. Please try an"
 742                         "alternative USB controller if you wish to use UAS.\n");
 743         return -ENODEV;
 744 }
 745
 746 static int uas_switch_interface(struct usb_device *udev,
 747                                                 struct usb_interface *intf)
 748 {
 749         int i;
 750         int sg_supported = udev->bus->sg_tablesize != 0;
 751
 752         for (i = 0; i < intf->num_altsetting; i++) {
 753                 struct usb_host_interface *alt = &intf->altsetting[i];
 754
 755                 if (uas_is_interface(alt)) {
 756                         if (!sg_supported)
 757                                 return uas_isnt_supported(udev);
 758                         return usb_set_interface(udev,
 759                                                 alt->desc.bInterfaceNumber,
 760                                                 alt->desc.bAlternateSetting);
 761                 }
 762         }
 763
 764         return -ENODEV;
 765 }
 766
 767 static void uas_configure_endpoints(struct uas_dev_info *devinfo)
 768 {
 769         struct usb_host_endpoint *eps[4] = { };
 770         struct usb_interface *intf = devinfo->intf;
 771         struct usb_device *udev = devinfo->udev;
 772         struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
 773         unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
 774
 775         devinfo->uas_sense_old = 0;
 776         devinfo->cmnd = NULL;
 777
 778         for (i = 0; i < n_endpoints; i++) {
 779                 unsigned char *extra = endpoint[i].extra;
 780                 int len = endpoint[i].extralen;
 781                 while (len > 1) {
 782                         if (extra[1] == USB_DT_PIPE_USAGE) {
 783                                 unsigned pipe_id = extra[2];
 784                                 if (pipe_id > 0 && pipe_id < 5)
 785                                         eps[pipe_id - 1] = &endpoint[i];
 786                                 break;
 787                         }
 788                         len -= extra[0];
 789                         extra += extra[0];
 790                 }
 791         }
 792
 793         /*
 794          * Assume that if we didn't find a control pipe descriptor, we're
 795          * using a device with old firmware that happens to be set up like
 796          * this.
 797          */
 798         if (!eps[0]) {
 799                 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
 800                 devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
 801                 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
 802                 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
 803
 804                 eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 805                 eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 806                 eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 807         } else {
 808                 devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 809                                                 eps[0]->desc.bEndpointAddress);
 810                 devinfo->status_pipe = usb_rcvbulkpipe(udev,
 811                                                 eps[1]->desc.bEndpointAddress);
 812                 devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 813                                                 eps[2]->desc.bEndpointAddress);
 814                 devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 815                                                 eps[3]->desc.bEndpointAddress);
 816         }
 817
 818         devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
 819                                                                 GFP_KERNEL);
 820         if (devinfo->qdepth < 0) {
 821                 devinfo->qdepth = 256;
 822                 devinfo->use_streams = 0;
 823         } else {
 824                 devinfo->use_streams = 1;
 825         }
 826 }
 827
 828 static void uas_free_streams(struct uas_dev_info *devinfo)
 829 {
 830         struct usb_device *udev = devinfo->udev;
 831         struct usb_host_endpoint *eps[3];
 832
 833         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 834         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 835         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 836         usb_free_streams(devinfo->intf, eps, 3, GFP_KERNEL);
 837 }
 838
 839 /*
 840  * XXX: What I'd like to do here is register a SCSI host for each USB host in
 841  * the system.  Follow usb-storage's design of registering a SCSI host for
 842  * each USB device for the moment.  Can implement this by walking up the
 843  * USB hierarchy until we find a USB host.
 844  */
 845 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 846 {
 847         int result;
 848         struct Scsi_Host *shost;
 849         struct uas_dev_info *devinfo;
 850         struct usb_device *udev = interface_to_usbdev(intf);
 851
 852         if (uas_switch_interface(udev, intf))
 853                 return -ENODEV;
 854
 855         devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
 856         if (!devinfo)
 857                 return -ENOMEM;
 858
 859         result = -ENOMEM;
 860         shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
 861         if (!shost)
 862                 goto free;
 863
 864         shost->max_cmd_len = 16 + 252;
 865         shost->max_id = 1;
 866         shost->sg_tablesize = udev->bus->sg_tablesize;
 867
 868         devinfo->intf = intf;
 869         devinfo->udev = udev;
 870         devinfo->resetting = 0;
 871         init_usb_anchor(&devinfo->sense_urbs);
 872         init_usb_anchor(&devinfo->data_urbs);
 873         uas_configure_endpoints(devinfo);
 874
 875         result = scsi_init_shared_tag_map(shost, devinfo->qdepth - 2);
 876         if (result)
 877                 goto free;
 878
 879         result = scsi_add_host(shost, &intf->dev);
 880         if (result)
 881                 goto deconfig_eps;
 882
 883         shost->hostdata[0] = (unsigned long)devinfo;
 884
 885         scsi_scan_host(shost);
 886         usb_set_intfdata(intf, shost);
 887         return result;
 888
 889 deconfig_eps:
 890         uas_free_streams(devinfo);
 891  free:
 892         kfree(devinfo);
 893         if (shost)
 894                 scsi_host_put(shost);
 895         return result;
 896 }
 897
 898 static int uas_pre_reset(struct usb_interface *intf)
 899 {
 900 /* XXX: Need to return 1 if it's not our device in error handling */
 901         return 0;
 902 }
 903
 904 static int uas_post_reset(struct usb_interface *intf)
 905 {
 906 /* XXX: Need to return 1 if it's not our device in error handling */
 907         return 0;
 908 }
 909
 910 static void uas_disconnect(struct usb_interface *intf)
 911 {
 912         struct Scsi_Host *shost = usb_get_intfdata(intf);
 913         struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
 914
 915         scsi_remove_host(shost);
 916         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 917         usb_kill_anchored_urbs(&devinfo->data_urbs);
 918         uas_free_streams(devinfo);
 919         kfree(devinfo);
 920 }
 921
 922 /*
 923  * XXX: Should this plug into libusual so we can auto-upgrade devices from
 924  * Bulk-Only to UAS?
 925  */
 926 static struct usb_driver uas_driver = {
 927         .name = "uas",
 928         .probe = uas_probe,
 929         .disconnect = uas_disconnect,
 930         .pre_reset = uas_pre_reset,
 931         .post_reset = uas_post_reset,
 932         .id_table = uas_usb_ids,
 933 };
 934
 935 module_usb_driver(uas_driver);
 936
 937 MODULE_LICENSE("GPL");
 938 MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");