drivers/usb/storage/uas.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * USB Attached SCSI
   4  * Note that this is not the same as the USB Mass Storage driver
   5  *
   6  * Copyright Hans de Goede <[email protected]> for Red Hat, Inc. 2013 - 2016
   7  * Copyright Matthew Wilcox for Intel Corp, 2010
   8  * Copyright Sarah Sharp for Intel Corp, 2010
   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_usual.h>
  17 #include <linux/usb/hcd.h>
  18 #include <linux/usb/storage.h>
  19 #include <linux/usb/uas.h>
  20
  21 #include <scsi/scsi.h>
  22 #include <scsi/scsi_eh.h>
  23 #include <scsi/scsi_dbg.h>
  24 #include <scsi/scsi_devinfo.h>
  25 #include <scsi/scsi_cmnd.h>
  26 #include <scsi/scsi_device.h>
  27 #include <scsi/scsi_host.h>
  28 #include <scsi/scsi_tcq.h>
  29
  30 #include "uas-detect.h"
  31 #include "scsiglue.h"
  32
  33 #define MAX_CMNDS 256
  34
  35 struct uas_dev_info {
  36         struct usb_interface *intf;
  37         struct usb_device *udev;
  38         struct usb_anchor cmd_urbs;
  39         struct usb_anchor sense_urbs;
  40         struct usb_anchor data_urbs;
  41         u64 flags;
  42         int qdepth, resetting;
  43         unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
  44         unsigned use_streams:1;
  45         unsigned shutdown:1;
  46         struct scsi_cmnd *cmnd[MAX_CMNDS];
  47         spinlock_t lock;
  48         struct work_struct work;
  49         struct work_struct scan_work;      /* for async scanning */
  50 };
  51
  52 enum {
  53         SUBMIT_STATUS_URB       = BIT(1),
  54         ALLOC_DATA_IN_URB       = BIT(2),
  55         SUBMIT_DATA_IN_URB      = BIT(3),
  56         ALLOC_DATA_OUT_URB      = BIT(4),
  57         SUBMIT_DATA_OUT_URB     = BIT(5),
  58         ALLOC_CMD_URB           = BIT(6),
  59         SUBMIT_CMD_URB          = BIT(7),
  60         COMMAND_INFLIGHT        = BIT(8),
  61         DATA_IN_URB_INFLIGHT    = BIT(9),
  62         DATA_OUT_URB_INFLIGHT   = BIT(10),
  63         COMMAND_ABORTED         = BIT(11),
  64         IS_IN_WORK_LIST         = BIT(12),
  65 };
  66
  67 /* Overrides scsi_pointer */
  68 struct uas_cmd_info {
  69         unsigned int state;
  70         unsigned int uas_tag;
  71         struct urb *cmd_urb;
  72         struct urb *data_in_urb;
  73         struct urb *data_out_urb;
  74 };
  75
  76 /* I hate forward declarations, but I actually have a loop */
  77 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
  78                                 struct uas_dev_info *devinfo);
  79 static void uas_do_work(struct work_struct *work);
  80 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller);
  81 static void uas_free_streams(struct uas_dev_info *devinfo);
  82 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
  83                                 int status);
  84
  85 /*
  86  * This driver needs its own workqueue, as we need to control memory allocation.
  87  *
  88  * In the course of error handling and power management uas_wait_for_pending_cmnds()
  89  * needs to flush pending work items. In these contexts we cannot allocate memory
  90  * by doing block IO as we would deadlock. For the same reason we cannot wait
  91  * for anything allocating memory not heeding these constraints.
  92  *
  93  * So we have to control all work items that can be on the workqueue we flush.
  94  * Hence we cannot share a queue and need our own.
  95  */
  96 static struct workqueue_struct *workqueue;
  97
  98 static void uas_do_work(struct work_struct *work)
  99 {
 100         struct uas_dev_info *devinfo =
 101                 container_of(work, struct uas_dev_info, work);
 102         struct uas_cmd_info *cmdinfo;
 103         struct scsi_cmnd *cmnd;
 104         unsigned long flags;
 105         int i, err;
 106
 107         spin_lock_irqsave(&devinfo->lock, flags);
 108
 109         if (devinfo->resetting)
 110                 goto out;
 111
 112         for (i = 0; i < devinfo->qdepth; i++) {
 113                 if (!devinfo->cmnd[i])
 114                         continue;
 115
 116                 cmnd = devinfo->cmnd[i];
 117                 cmdinfo = scsi_cmd_priv(cmnd);
 118
 119                 if (!(cmdinfo->state & IS_IN_WORK_LIST))
 120                         continue;
 121
 122                 err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
 123                 if (!err)
 124                         cmdinfo->state &= ~IS_IN_WORK_LIST;
 125                 else
 126                         queue_work(workqueue, &devinfo->work);
 127         }
 128 out:
 129         spin_unlock_irqrestore(&devinfo->lock, flags);
 130 }
 131
 132 static void uas_scan_work(struct work_struct *work)
 133 {
 134         struct uas_dev_info *devinfo =
 135                 container_of(work, struct uas_dev_info, scan_work);
 136         struct Scsi_Host *shost = usb_get_intfdata(devinfo->intf);
 137
 138         dev_dbg(&devinfo->intf->dev, "starting scan\n");
 139         scsi_scan_host(shost);
 140         dev_dbg(&devinfo->intf->dev, "scan complete\n");
 141 }
 142
 143 static void uas_add_work(struct scsi_cmnd *cmnd)
 144 {
 145         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 146         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 147
 148         lockdep_assert_held(&devinfo->lock);
 149         cmdinfo->state |= IS_IN_WORK_LIST;
 150         queue_work(workqueue, &devinfo->work);
 151 }
 152
 153 static void uas_zap_pending(struct uas_dev_info *devinfo, int result)
 154 {
 155         struct uas_cmd_info *cmdinfo;
 156         struct scsi_cmnd *cmnd;
 157         unsigned long flags;
 158         int i, err;
 159
 160         spin_lock_irqsave(&devinfo->lock, flags);
 161         for (i = 0; i < devinfo->qdepth; i++) {
 162                 if (!devinfo->cmnd[i])
 163                         continue;
 164
 165                 cmnd = devinfo->cmnd[i];
 166                 cmdinfo = scsi_cmd_priv(cmnd);
 167                 uas_log_cmd_state(cmnd, __func__, 0);
 168                 /* Sense urbs were killed, clear COMMAND_INFLIGHT manually */
 169                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 170                 cmnd->result = result << 16;
 171                 err = uas_try_complete(cmnd, __func__);
 172                 WARN_ON(err != 0);
 173         }
 174         spin_unlock_irqrestore(&devinfo->lock, flags);
 175 }
 176
 177 static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
 178 {
 179         struct sense_iu *sense_iu = urb->transfer_buffer;
 180         struct scsi_device *sdev = cmnd->device;
 181
 182         if (urb->actual_length > 16) {
 183                 unsigned len = be16_to_cpup(&sense_iu->len);
 184                 if (len + 16 != urb->actual_length) {
 185                         int newlen = min(len + 16, urb->actual_length) - 16;
 186                         if (newlen < 0)
 187                                 newlen = 0;
 188                         sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
 189                                 "disagrees with IU sense data length %d, "
 190                                 "using %d bytes of sense data\n", __func__,
 191                                         urb->actual_length, len, newlen);
 192                         len = newlen;
 193                 }
 194                 memcpy(cmnd->sense_buffer, sense_iu->sense, len);
 195         }
 196
 197         cmnd->result = sense_iu->status;
 198 }
 199
 200 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix,
 201                               int status)
 202 {
 203         struct uas_cmd_info *ci = scsi_cmd_priv(cmnd);
 204
 205         if (status == -ENODEV) /* too late */
 206                 return;
 207
 208         scmd_printk(KERN_INFO, cmnd,
 209                     "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ",
 210                     prefix, status, ci->uas_tag,
 211                     (ci->state & SUBMIT_STATUS_URB)     ? " s-st"  : "",
 212                     (ci->state & ALLOC_DATA_IN_URB)     ? " a-in"  : "",
 213                     (ci->state & SUBMIT_DATA_IN_URB)    ? " s-in"  : "",
 214                     (ci->state & ALLOC_DATA_OUT_URB)    ? " a-out" : "",
 215                     (ci->state & SUBMIT_DATA_OUT_URB)   ? " s-out" : "",
 216                     (ci->state & ALLOC_CMD_URB)         ? " a-cmd" : "",
 217                     (ci->state & SUBMIT_CMD_URB)        ? " s-cmd" : "",
 218                     (ci->state & COMMAND_INFLIGHT)      ? " CMD"   : "",
 219                     (ci->state & DATA_IN_URB_INFLIGHT)  ? " IN"    : "",
 220                     (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT"   : "",
 221                     (ci->state & COMMAND_ABORTED)       ? " abort" : "",
 222                     (ci->state & IS_IN_WORK_LIST)       ? " work"  : "");
 223         scsi_print_command(cmnd);
 224 }
 225
 226 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd)
 227 {
 228         struct uas_cmd_info *cmdinfo;
 229
 230         if (!cmnd)
 231                 return;
 232
 233         cmdinfo = scsi_cmd_priv(cmnd);
 234
 235         if (cmdinfo->state & SUBMIT_CMD_URB)
 236                 usb_free_urb(cmdinfo->cmd_urb);
 237
 238         /* data urbs may have never gotten their submit flag set */
 239         if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT))
 240                 usb_free_urb(cmdinfo->data_in_urb);
 241         if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT))
 242                 usb_free_urb(cmdinfo->data_out_urb);
 243 }
 244
 245 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller)
 246 {
 247         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 248         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 249
 250         lockdep_assert_held(&devinfo->lock);
 251         if (cmdinfo->state & (COMMAND_INFLIGHT |
 252                               DATA_IN_URB_INFLIGHT |
 253                               DATA_OUT_URB_INFLIGHT |
 254                               COMMAND_ABORTED))
 255                 return -EBUSY;
 256         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
 257         uas_free_unsubmitted_urbs(cmnd);
 258         scsi_done(cmnd);
 259         return 0;
 260 }
 261
 262 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
 263                           unsigned direction)
 264 {
 265         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 266         int err;
 267
 268         cmdinfo->state |= direction | SUBMIT_STATUS_URB;
 269         err = uas_submit_urbs(cmnd, cmnd->device->hostdata);
 270         if (err) {
 271                 uas_add_work(cmnd);
 272         }
 273 }
 274
 275 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd)
 276 {
 277         u8 response_code = riu->response_code;
 278
 279         switch (response_code) {
 280         case RC_INCORRECT_LUN:
 281                 set_host_byte(cmnd, DID_BAD_TARGET);
 282                 break;
 283         case RC_TMF_SUCCEEDED:
 284                 set_host_byte(cmnd, DID_OK);
 285                 break;
 286         case RC_TMF_NOT_SUPPORTED:
 287                 set_host_byte(cmnd, DID_BAD_TARGET);
 288                 break;
 289         default:
 290                 uas_log_cmd_state(cmnd, "response iu", response_code);
 291                 set_host_byte(cmnd, DID_ERROR);
 292                 break;
 293         }
 294
 295         return response_code == RC_TMF_SUCCEEDED;
 296 }
 297
 298 static void uas_stat_cmplt(struct urb *urb)
 299 {
 300         struct iu *iu = urb->transfer_buffer;
 301         struct Scsi_Host *shost = urb->context;
 302         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
 303         struct urb *data_in_urb = NULL;
 304         struct urb *data_out_urb = NULL;
 305         struct scsi_cmnd *cmnd;
 306         struct uas_cmd_info *cmdinfo;
 307         unsigned long flags;
 308         unsigned int idx;
 309         int status = urb->status;
 310         bool success;
 311
 312         spin_lock_irqsave(&devinfo->lock, flags);
 313
 314         if (devinfo->resetting)
 315                 goto out;
 316
 317         if (status) {
 318                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
 319                         dev_err(&urb->dev->dev, "stat urb: status %d\n", status);
 320                 goto out;
 321         }
 322
 323         idx = be16_to_cpup(&iu->tag) - 1;
 324         if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) {
 325                 dev_err(&urb->dev->dev,
 326                         "stat urb: no pending cmd for uas-tag %d\n", idx + 1);
 327                 goto out;
 328         }
 329
 330         cmnd = devinfo->cmnd[idx];
 331         cmdinfo = scsi_cmd_priv(cmnd);
 332
 333         if (!(cmdinfo->state & COMMAND_INFLIGHT)) {
 334                 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0);
 335                 goto out;
 336         }
 337
 338         switch (iu->iu_id) {
 339         case IU_ID_STATUS:
 340                 uas_sense(urb, cmnd);
 341                 if (cmnd->result != 0) {
 342                         /* cancel data transfers on error */
 343                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 344                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 345                 }
 346                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 347                 uas_try_complete(cmnd, __func__);
 348                 break;
 349         case IU_ID_READ_READY:
 350                 if (!cmdinfo->data_in_urb ||
 351                                 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) {
 352                         uas_log_cmd_state(cmnd, "unexpected read rdy", 0);
 353                         break;
 354                 }
 355                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
 356                 break;
 357         case IU_ID_WRITE_READY:
 358                 if (!cmdinfo->data_out_urb ||
 359                                 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) {
 360                         uas_log_cmd_state(cmnd, "unexpected write rdy", 0);
 361                         break;
 362                 }
 363                 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
 364                 break;
 365         case IU_ID_RESPONSE:
 366                 cmdinfo->state &= ~COMMAND_INFLIGHT;
 367                 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd);
 368                 if (!success) {
 369                         /* Error, cancel data transfers */
 370                         data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 371                         data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 372                 }
 373                 uas_try_complete(cmnd, __func__);
 374                 break;
 375         default:
 376                 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id);
 377         }
 378 out:
 379         usb_free_urb(urb);
 380         spin_unlock_irqrestore(&devinfo->lock, flags);
 381
 382         /* Unlinking of data urbs must be done without holding the lock */
 383         if (data_in_urb) {
 384                 usb_unlink_urb(data_in_urb);
 385                 usb_put_urb(data_in_urb);
 386         }
 387         if (data_out_urb) {
 388                 usb_unlink_urb(data_out_urb);
 389                 usb_put_urb(data_out_urb);
 390         }
 391 }
 392
 393 static void uas_data_cmplt(struct urb *urb)
 394 {
 395         struct scsi_cmnd *cmnd = urb->context;
 396         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 397         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 398         struct scsi_data_buffer *sdb = &cmnd->sdb;
 399         unsigned long flags;
 400         int status = urb->status;
 401
 402         spin_lock_irqsave(&devinfo->lock, flags);
 403
 404         if (cmdinfo->data_in_urb == urb) {
 405                 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT;
 406                 cmdinfo->data_in_urb = NULL;
 407         } else if (cmdinfo->data_out_urb == urb) {
 408                 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT;
 409                 cmdinfo->data_out_urb = NULL;
 410         }
 411
 412         if (devinfo->resetting)
 413                 goto out;
 414
 415         /* Data urbs should not complete before the cmd urb is submitted */
 416         if (cmdinfo->state & SUBMIT_CMD_URB) {
 417                 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0);
 418                 goto out;
 419         }
 420
 421         if (status) {
 422                 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN)
 423                         uas_log_cmd_state(cmnd, "data cmplt err", status);
 424                 /* error: no data transfered */
 425                 scsi_set_resid(cmnd, sdb->length);
 426                 set_host_byte(cmnd, DID_ERROR);
 427         } else {
 428                 scsi_set_resid(cmnd, sdb->length - urb->actual_length);
 429         }
 430         uas_try_complete(cmnd, __func__);
 431 out:
 432         usb_free_urb(urb);
 433         spin_unlock_irqrestore(&devinfo->lock, flags);
 434 }
 435
 436 static void uas_cmd_cmplt(struct urb *urb)
 437 {
 438         if (urb->status)
 439                 dev_err(&urb->dev->dev, "cmd cmplt err %d\n", urb->status);
 440
 441         usb_free_urb(urb);
 442 }
 443
 444 static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 445                                       struct scsi_cmnd *cmnd,
 446                                       enum dma_data_direction dir)
 447 {
 448         struct usb_device *udev = devinfo->udev;
 449         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 450         struct urb *urb = usb_alloc_urb(0, gfp);
 451         struct scsi_data_buffer *sdb = &cmnd->sdb;
 452         unsigned int pipe = (dir == DMA_FROM_DEVICE)
 453                 ? devinfo->data_in_pipe : devinfo->data_out_pipe;
 454
 455         if (!urb)
 456                 goto out;
 457         usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length,
 458                           uas_data_cmplt, cmnd);
 459         if (devinfo->use_streams)
 460                 urb->stream_id = cmdinfo->uas_tag;
 461         urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
 462         urb->sg = sdb->table.sgl;
 463  out:
 464         return urb;
 465 }
 466
 467 static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 468                                        struct scsi_cmnd *cmnd)
 469 {
 470         struct usb_device *udev = devinfo->udev;
 471         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 472         struct urb *urb = usb_alloc_urb(0, gfp);
 473         struct sense_iu *iu;
 474
 475         if (!urb)
 476                 goto out;
 477
 478         iu = kzalloc(sizeof(*iu), gfp);
 479         if (!iu)
 480                 goto free;
 481
 482         usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
 483                           uas_stat_cmplt, cmnd->device->host);
 484         if (devinfo->use_streams)
 485                 urb->stream_id = cmdinfo->uas_tag;
 486         urb->transfer_flags |= URB_FREE_BUFFER;
 487  out:
 488         return urb;
 489  free:
 490         usb_free_urb(urb);
 491         return NULL;
 492 }
 493
 494 static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
 495                                         struct scsi_cmnd *cmnd)
 496 {
 497         struct usb_device *udev = devinfo->udev;
 498         struct scsi_device *sdev = cmnd->device;
 499         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 500         struct urb *urb = usb_alloc_urb(0, gfp);
 501         struct command_iu *iu;
 502         int len;
 503
 504         if (!urb)
 505                 goto out;
 506
 507         len = cmnd->cmd_len - 16;
 508         if (len < 0)
 509                 len = 0;
 510         len = ALIGN(len, 4);
 511         iu = kzalloc(sizeof(*iu) + len, gfp);
 512         if (!iu)
 513                 goto free;
 514
 515         iu->iu_id = IU_ID_COMMAND;
 516         iu->tag = cpu_to_be16(cmdinfo->uas_tag);
 517         iu->prio_attr = UAS_SIMPLE_TAG;
 518         iu->len = len;
 519         int_to_scsilun(sdev->lun, &iu->lun);
 520         memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
 521
 522         usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
 523                                                         uas_cmd_cmplt, NULL);
 524         urb->transfer_flags |= URB_FREE_BUFFER;
 525  out:
 526         return urb;
 527  free:
 528         usb_free_urb(urb);
 529         return NULL;
 530 }
 531
 532 /*
 533  * Why should I request the Status IU before sending the Command IU?  Spec
 534  * says to, but also says the device may receive them in any order.  Seems
 535  * daft to me.
 536  */
 537
 538 static int uas_submit_sense_urb(struct scsi_cmnd *cmnd, gfp_t gfp)
 539 {
 540         struct uas_dev_info *devinfo = cmnd->device->hostdata;
 541         struct urb *urb;
 542         int err;
 543
 544         urb = uas_alloc_sense_urb(devinfo, gfp, cmnd);
 545         if (!urb)
 546                 return -ENOMEM;
 547         usb_anchor_urb(urb, &devinfo->sense_urbs);
 548         err = usb_submit_urb(urb, gfp);
 549         if (err) {
 550                 usb_unanchor_urb(urb);
 551                 uas_log_cmd_state(cmnd, "sense submit err", err);
 552                 usb_free_urb(urb);
 553         }
 554         return err;
 555 }
 556
 557 static int uas_submit_urbs(struct scsi_cmnd *cmnd,
 558                            struct uas_dev_info *devinfo)
 559 {
 560         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 561         int err;
 562
 563         lockdep_assert_held(&devinfo->lock);
 564         if (cmdinfo->state & SUBMIT_STATUS_URB) {
 565                 err = uas_submit_sense_urb(cmnd, GFP_ATOMIC);
 566                 if (err)
 567                         return err;
 568                 cmdinfo->state &= ~SUBMIT_STATUS_URB;
 569         }
 570
 571         if (cmdinfo->state & ALLOC_DATA_IN_URB) {
 572                 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
 573                                                         cmnd, DMA_FROM_DEVICE);
 574                 if (!cmdinfo->data_in_urb)
 575                         return -ENOMEM;
 576                 cmdinfo->state &= ~ALLOC_DATA_IN_URB;
 577         }
 578
 579         if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
 580                 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs);
 581                 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC);
 582                 if (err) {
 583                         usb_unanchor_urb(cmdinfo->data_in_urb);
 584                         uas_log_cmd_state(cmnd, "data in submit err", err);
 585                         return err;
 586                 }
 587                 cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
 588                 cmdinfo->state |= DATA_IN_URB_INFLIGHT;
 589         }
 590
 591         if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
 592                 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC,
 593                                                         cmnd, DMA_TO_DEVICE);
 594                 if (!cmdinfo->data_out_urb)
 595                         return -ENOMEM;
 596                 cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
 597         }
 598
 599         if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
 600                 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs);
 601                 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC);
 602                 if (err) {
 603                         usb_unanchor_urb(cmdinfo->data_out_urb);
 604                         uas_log_cmd_state(cmnd, "data out submit err", err);
 605                         return err;
 606                 }
 607                 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
 608                 cmdinfo->state |= DATA_OUT_URB_INFLIGHT;
 609         }
 610
 611         if (cmdinfo->state & ALLOC_CMD_URB) {
 612                 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd);
 613                 if (!cmdinfo->cmd_urb)
 614                         return -ENOMEM;
 615                 cmdinfo->state &= ~ALLOC_CMD_URB;
 616         }
 617
 618         if (cmdinfo->state & SUBMIT_CMD_URB) {
 619                 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs);
 620                 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC);
 621                 if (err) {
 622                         usb_unanchor_urb(cmdinfo->cmd_urb);
 623                         uas_log_cmd_state(cmnd, "cmd submit err", err);
 624                         return err;
 625                 }
 626                 cmdinfo->cmd_urb = NULL;
 627                 cmdinfo->state &= ~SUBMIT_CMD_URB;
 628                 cmdinfo->state |= COMMAND_INFLIGHT;
 629         }
 630
 631         return 0;
 632 }
 633
 634 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd)
 635 {
 636         struct scsi_device *sdev = cmnd->device;
 637         struct uas_dev_info *devinfo = sdev->hostdata;
 638         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 639         unsigned long flags;
 640         int idx, err;
 641
 642         /* Re-check scsi_block_requests now that we've the host-lock */
 643         if (cmnd->device->host->host_self_blocked)
 644                 return SCSI_MLQUEUE_DEVICE_BUSY;
 645
 646         if ((devinfo->flags & US_FL_NO_ATA_1X) &&
 647                         (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) {
 648                 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB,
 649                        sizeof(usb_stor_sense_invalidCDB));
 650                 cmnd->result = SAM_STAT_CHECK_CONDITION;
 651                 scsi_done(cmnd);
 652                 return 0;
 653         }
 654
 655         spin_lock_irqsave(&devinfo->lock, flags);
 656
 657         if (devinfo->resetting) {
 658                 set_host_byte(cmnd, DID_ERROR);
 659                 scsi_done(cmnd);
 660                 goto zombie;
 661         }
 662
 663         /* Find a free uas-tag */
 664         for (idx = 0; idx < devinfo->qdepth; idx++) {
 665                 if (!devinfo->cmnd[idx])
 666                         break;
 667         }
 668         if (idx == devinfo->qdepth) {
 669                 spin_unlock_irqrestore(&devinfo->lock, flags);
 670                 return SCSI_MLQUEUE_DEVICE_BUSY;
 671         }
 672
 673         memset(cmdinfo, 0, sizeof(*cmdinfo));
 674         cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */
 675         cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB;
 676
 677         switch (cmnd->sc_data_direction) {
 678         case DMA_FROM_DEVICE:
 679                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 680                 break;
 681         case DMA_BIDIRECTIONAL:
 682                 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
 683                 fallthrough;
 684         case DMA_TO_DEVICE:
 685                 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
 686                 break;
 687         case DMA_NONE:
 688                 break;
 689         }
 690
 691         if (!devinfo->use_streams)
 692                 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
 693
 694         err = uas_submit_urbs(cmnd, devinfo);
 695         /*
 696          * in case of fatal errors the SCSI layer is peculiar
 697          * a command that has finished is a success for the purpose
 698          * of queueing, no matter how fatal the error
 699          */
 700         if (err == -ENODEV) {
 701                 set_host_byte(cmnd, DID_NO_CONNECT);
 702                 scsi_done(cmnd);
 703                 goto zombie;
 704         }
 705         if (err) {
 706                 /* If we did nothing, give up now */
 707                 if (cmdinfo->state & SUBMIT_STATUS_URB) {
 708                         spin_unlock_irqrestore(&devinfo->lock, flags);
 709                         return SCSI_MLQUEUE_DEVICE_BUSY;
 710                 }
 711                 uas_add_work(cmnd);
 712         }
 713
 714         devinfo->cmnd[idx] = cmnd;
 715 zombie:
 716         spin_unlock_irqrestore(&devinfo->lock, flags);
 717         return 0;
 718 }
 719
 720 static DEF_SCSI_QCMD(uas_queuecommand)
 721
 722 /*
 723  * For now we do not support actually sending an abort to the device, so
 724  * this eh always fails. Still we must define it to make sure that we've
 725  * dropped all references to the cmnd in question once this function exits.
 726  */
 727 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
 728 {
 729         struct uas_cmd_info *cmdinfo = scsi_cmd_priv(cmnd);
 730         struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata;
 731         struct urb *data_in_urb = NULL;
 732         struct urb *data_out_urb = NULL;
 733         unsigned long flags;
 734
 735         spin_lock_irqsave(&devinfo->lock, flags);
 736
 737         uas_log_cmd_state(cmnd, __func__, 0);
 738
 739         /* Ensure that try_complete does not call scsi_done */
 740         cmdinfo->state |= COMMAND_ABORTED;
 741
 742         /* Drop all refs to this cmnd, kill data urbs to break their ref */
 743         devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL;
 744         if (cmdinfo->state & DATA_IN_URB_INFLIGHT)
 745                 data_in_urb = usb_get_urb(cmdinfo->data_in_urb);
 746         if (cmdinfo->state & DATA_OUT_URB_INFLIGHT)
 747                 data_out_urb = usb_get_urb(cmdinfo->data_out_urb);
 748
 749         uas_free_unsubmitted_urbs(cmnd);
 750
 751         spin_unlock_irqrestore(&devinfo->lock, flags);
 752
 753         if (data_in_urb) {
 754                 usb_kill_urb(data_in_urb);
 755                 usb_put_urb(data_in_urb);
 756         }
 757         if (data_out_urb) {
 758                 usb_kill_urb(data_out_urb);
 759                 usb_put_urb(data_out_urb);
 760         }
 761
 762         return FAILED;
 763 }
 764
 765 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
 766 {
 767         struct scsi_device *sdev = cmnd->device;
 768         struct uas_dev_info *devinfo = sdev->hostdata;
 769         struct usb_device *udev = devinfo->udev;
 770         unsigned long flags;
 771         int err;
 772
 773         err = usb_lock_device_for_reset(udev, devinfo->intf);
 774         if (err) {
 775                 shost_printk(KERN_ERR, sdev->host,
 776                              "%s FAILED to get lock err %d\n", __func__, err);
 777                 return FAILED;
 778         }
 779
 780         shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__);
 781
 782         spin_lock_irqsave(&devinfo->lock, flags);
 783         devinfo->resetting = 1;
 784         spin_unlock_irqrestore(&devinfo->lock, flags);
 785
 786         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
 787         usb_kill_anchored_urbs(&devinfo->sense_urbs);
 788         usb_kill_anchored_urbs(&devinfo->data_urbs);
 789         uas_zap_pending(devinfo, DID_RESET);
 790
 791         err = usb_reset_device(udev);
 792
 793         spin_lock_irqsave(&devinfo->lock, flags);
 794         devinfo->resetting = 0;
 795         spin_unlock_irqrestore(&devinfo->lock, flags);
 796
 797         usb_unlock_device(udev);
 798
 799         if (err) {
 800                 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n",
 801                              __func__, err);
 802                 return FAILED;
 803         }
 804
 805         shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__);
 806         return SUCCESS;
 807 }
 808
 809 static int uas_target_alloc(struct scsi_target *starget)
 810 {
 811         struct uas_dev_info *devinfo = (struct uas_dev_info *)
 812                         dev_to_shost(starget->dev.parent)->hostdata;
 813
 814         if (devinfo->flags & US_FL_NO_REPORT_LUNS)
 815                 starget->no_report_luns = 1;
 816
 817         return 0;
 818 }
 819
 820 static int uas_slave_alloc(struct scsi_device *sdev)
 821 {
 822         struct uas_dev_info *devinfo =
 823                 (struct uas_dev_info *)sdev->host->hostdata;
 824
 825         /*
 826          * Some USB storage devices reset if the IO advice hints grouping mode
 827          * page is queried. Hence skip that mode page.
 828          */
 829         sdev->sdev_bflags |= BLIST_SKIP_IO_HINTS;
 830
 831         sdev->hostdata = devinfo;
 832         return 0;
 833 }
 834
 835 static int uas_device_configure(struct scsi_device *sdev,
 836                 struct queue_limits *lim)
 837 {
 838         struct uas_dev_info *devinfo = sdev->hostdata;
 839
 840         if (devinfo->flags & US_FL_MAX_SECTORS_64)
 841                 lim->max_hw_sectors = 64;
 842         else if (devinfo->flags & US_FL_MAX_SECTORS_240)
 843                 lim->max_hw_sectors = 240;
 844
 845         if (devinfo->flags & US_FL_NO_REPORT_OPCODES)
 846                 sdev->no_report_opcodes = 1;
 847
 848         /* A few buggy USB-ATA bridges don't understand FUA */
 849         if (devinfo->flags & US_FL_BROKEN_FUA)
 850                 sdev->broken_fua = 1;
 851
 852         /* UAS also needs to support FL_ALWAYS_SYNC */
 853         if (devinfo->flags & US_FL_ALWAYS_SYNC) {
 854                 sdev->skip_ms_page_3f = 1;
 855                 sdev->skip_ms_page_8 = 1;
 856                 sdev->wce_default_on = 1;
 857         }
 858
 859         /* Some disks cannot handle READ_CAPACITY_16 */
 860         if (devinfo->flags & US_FL_NO_READ_CAPACITY_16)
 861                 sdev->no_read_capacity_16 = 1;
 862
 863         /* Some disks cannot handle WRITE_SAME */
 864         if (devinfo->flags & US_FL_NO_SAME)
 865                 sdev->no_write_same = 1;
 866         /*
 867          * Some disks return the total number of blocks in response
 868          * to READ CAPACITY rather than the highest block number.
 869          * If this device makes that mistake, tell the sd driver.
 870          */
 871         if (devinfo->flags & US_FL_FIX_CAPACITY)
 872                 sdev->fix_capacity = 1;
 873
 874         /*
 875          * in some cases we have to guess
 876          */
 877         if (devinfo->flags & US_FL_CAPACITY_HEURISTICS)
 878                 sdev->guess_capacity = 1;
 879
 880         /*
 881          * Some devices report generic values until the media has been
 882          * accessed. Force a READ(10) prior to querying device
 883          * characteristics.
 884          */
 885         sdev->read_before_ms = 1;
 886
 887         /*
 888          * Some devices don't like MODE SENSE with page=0x3f,
 889          * which is the command used for checking if a device
 890          * is write-protected.  Now that we tell the sd driver
 891          * to do a 192-byte transfer with this command the
 892          * majority of devices work fine, but a few still can't
 893          * handle it.  The sd driver will simply assume those
 894          * devices are write-enabled.
 895          */
 896         if (devinfo->flags & US_FL_NO_WP_DETECT)
 897                 sdev->skip_ms_page_3f = 1;
 898
 899         scsi_change_queue_depth(sdev, devinfo->qdepth - 2);
 900         return 0;
 901 }
 902
 903 static const struct scsi_host_template uas_host_template = {
 904         .module = THIS_MODULE,
 905         .name = "uas",
 906         .queuecommand = uas_queuecommand,
 907         .target_alloc = uas_target_alloc,
 908         .slave_alloc = uas_slave_alloc,
 909         .device_configure = uas_device_configure,
 910         .eh_abort_handler = uas_eh_abort_handler,
 911         .eh_device_reset_handler = uas_eh_device_reset_handler,
 912         .this_id = -1,
 913         .skip_settle_delay = 1,
 914         /*
 915          * The protocol has no requirements on alignment in the strict sense.
 916          * Controllers may or may not have alignment restrictions.
 917          * As this is not exported, we use an extremely conservative guess.
 918          */
 919         .dma_alignment = 511,
 920         .dma_boundary = PAGE_SIZE - 1,
 921         .cmd_size = sizeof(struct uas_cmd_info),
 922 };
 923
 924 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \
 925                     vendorName, productName, useProtocol, useTransport, \
 926                     initFunction, flags) \
 927 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \
 928         .driver_info = (flags) }
 929
 930 static struct usb_device_id uas_usb_ids[] = {
 931 #       include "unusual_uas.h"
 932         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
 933         { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
 934         { }
 935 };
 936 MODULE_DEVICE_TABLE(usb, uas_usb_ids);
 937
 938 #undef UNUSUAL_DEV
 939
 940 static int uas_switch_interface(struct usb_device *udev,
 941                                 struct usb_interface *intf)
 942 {
 943         struct usb_host_interface *alt;
 944
 945         alt = uas_find_uas_alt_setting(intf);
 946         if (!alt)
 947                 return -ENODEV;
 948
 949         return usb_set_interface(udev, alt->desc.bInterfaceNumber,
 950                         alt->desc.bAlternateSetting);
 951 }
 952
 953 static int uas_configure_endpoints(struct uas_dev_info *devinfo)
 954 {
 955         struct usb_host_endpoint *eps[4] = { };
 956         struct usb_device *udev = devinfo->udev;
 957         int r;
 958
 959         r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps);
 960         if (r)
 961                 return r;
 962
 963         devinfo->cmd_pipe = usb_sndbulkpipe(udev,
 964                                             usb_endpoint_num(&eps[0]->desc));
 965         devinfo->status_pipe = usb_rcvbulkpipe(udev,
 966                                             usb_endpoint_num(&eps[1]->desc));
 967         devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
 968                                             usb_endpoint_num(&eps[2]->desc));
 969         devinfo->data_out_pipe = usb_sndbulkpipe(udev,
 970                                             usb_endpoint_num(&eps[3]->desc));
 971
 972         if (udev->speed < USB_SPEED_SUPER) {
 973                 devinfo->qdepth = 32;
 974                 devinfo->use_streams = 0;
 975         } else {
 976                 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1,
 977                                                     3, MAX_CMNDS, GFP_NOIO);
 978                 if (devinfo->qdepth < 0)
 979                         return devinfo->qdepth;
 980                 devinfo->use_streams = 1;
 981         }
 982
 983         return 0;
 984 }
 985
 986 static void uas_free_streams(struct uas_dev_info *devinfo)
 987 {
 988         struct usb_device *udev = devinfo->udev;
 989         struct usb_host_endpoint *eps[3];
 990
 991         eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
 992         eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
 993         eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
 994         usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO);
 995 }
 996
 997 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
 998 {
 999         int result = -ENOMEM;
1000         struct Scsi_Host *shost = NULL;
1001         struct uas_dev_info *devinfo;
1002         struct usb_device *udev = interface_to_usbdev(intf);
1003         u64 dev_flags;
1004
1005         if (!uas_use_uas_driver(intf, id, &dev_flags))
1006                 return -ENODEV;
1007
1008         if (uas_switch_interface(udev, intf))
1009                 return -ENODEV;
1010
1011         shost = scsi_host_alloc(&uas_host_template,
1012                                 sizeof(struct uas_dev_info));
1013         if (!shost)
1014                 goto set_alt0;
1015
1016         shost->max_cmd_len = 16 + 252;
1017         shost->max_id = 1;
1018         shost->max_lun = 256;
1019         shost->max_channel = 0;
1020         shost->sg_tablesize = udev->bus->sg_tablesize;
1021
1022         devinfo = (struct uas_dev_info *)shost->hostdata;
1023         devinfo->intf = intf;
1024         devinfo->udev = udev;
1025         devinfo->resetting = 0;
1026         devinfo->shutdown = 0;
1027         devinfo->flags = dev_flags;
1028         init_usb_anchor(&devinfo->cmd_urbs);
1029         init_usb_anchor(&devinfo->sense_urbs);
1030         init_usb_anchor(&devinfo->data_urbs);
1031         spin_lock_init(&devinfo->lock);
1032         INIT_WORK(&devinfo->work, uas_do_work);
1033         INIT_WORK(&devinfo->scan_work, uas_scan_work);
1034
1035         result = uas_configure_endpoints(devinfo);
1036         if (result)
1037                 goto set_alt0;
1038
1039         /*
1040          * 1 tag is reserved for untagged commands +
1041          * 1 tag to avoid off by one errors in some bridge firmwares
1042          */
1043         shost->can_queue = devinfo->qdepth - 2;
1044
1045         usb_set_intfdata(intf, shost);
1046         result = scsi_add_host(shost, &intf->dev);
1047         if (result)
1048                 goto free_streams;
1049
1050         /* Submit the delayed_work for SCSI-device scanning */
1051         schedule_work(&devinfo->scan_work);
1052
1053         return result;
1054
1055 free_streams:
1056         uas_free_streams(devinfo);
1057         usb_set_intfdata(intf, NULL);
1058 set_alt0:
1059         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1060         if (shost)
1061                 scsi_host_put(shost);
1062         return result;
1063 }
1064
1065 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo)
1066 {
1067         unsigned long flags;
1068         int i, r = 1;
1069
1070         spin_lock_irqsave(&devinfo->lock, flags);
1071
1072         for (i = 0; i < devinfo->qdepth; i++) {
1073                 if (devinfo->cmnd[i]) {
1074                         r = 0; /* Not empty */
1075                         break;
1076                 }
1077         }
1078
1079         spin_unlock_irqrestore(&devinfo->lock, flags);
1080
1081         return r;
1082 }
1083
1084 /*
1085  * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily
1086  * get empty while there still is more work to do due to sense-urbs completing
1087  * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty.
1088  */
1089 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo)
1090 {
1091         unsigned long start_time;
1092         int r;
1093
1094         start_time = jiffies;
1095         do {
1096                 flush_work(&devinfo->work);
1097
1098                 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000);
1099                 if (r == 0)
1100                         return -ETIME;
1101
1102                 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500);
1103                 if (r == 0)
1104                         return -ETIME;
1105
1106                 if (time_after(jiffies, start_time + 5 * HZ))
1107                         return -ETIME;
1108         } while (!uas_cmnd_list_empty(devinfo));
1109
1110         return 0;
1111 }
1112
1113 static int uas_pre_reset(struct usb_interface *intf)
1114 {
1115         struct Scsi_Host *shost = usb_get_intfdata(intf);
1116         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1117         unsigned long flags;
1118
1119         if (devinfo->shutdown)
1120                 return 0;
1121
1122         /* Block new requests */
1123         spin_lock_irqsave(shost->host_lock, flags);
1124         scsi_block_requests(shost);
1125         spin_unlock_irqrestore(shost->host_lock, flags);
1126
1127         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1128                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1129                 scsi_unblock_requests(shost);
1130                 return 1;
1131         }
1132
1133         uas_free_streams(devinfo);
1134
1135         return 0;
1136 }
1137
1138 static int uas_post_reset(struct usb_interface *intf)
1139 {
1140         struct Scsi_Host *shost = usb_get_intfdata(intf);
1141         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1142         unsigned long flags;
1143         int err;
1144
1145         if (devinfo->shutdown)
1146                 return 0;
1147
1148         err = uas_configure_endpoints(devinfo);
1149         if (err && err != -ENODEV)
1150                 shost_printk(KERN_ERR, shost,
1151                              "%s: alloc streams error %d after reset",
1152                              __func__, err);
1153
1154         /* we must unblock the host in every case lest we deadlock */
1155         spin_lock_irqsave(shost->host_lock, flags);
1156         scsi_report_bus_reset(shost, 0);
1157         spin_unlock_irqrestore(shost->host_lock, flags);
1158
1159         scsi_unblock_requests(shost);
1160
1161         return err ? 1 : 0;
1162 }
1163
1164 static int uas_suspend(struct usb_interface *intf, pm_message_t message)
1165 {
1166         struct Scsi_Host *shost = usb_get_intfdata(intf);
1167         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1168
1169         if (uas_wait_for_pending_cmnds(devinfo) != 0) {
1170                 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__);
1171                 return -ETIME;
1172         }
1173
1174         return 0;
1175 }
1176
1177 static int uas_resume(struct usb_interface *intf)
1178 {
1179         return 0;
1180 }
1181
1182 static int uas_reset_resume(struct usb_interface *intf)
1183 {
1184         struct Scsi_Host *shost = usb_get_intfdata(intf);
1185         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1186         unsigned long flags;
1187         int err;
1188
1189         err = uas_configure_endpoints(devinfo);
1190         if (err) {
1191                 shost_printk(KERN_ERR, shost,
1192                              "%s: alloc streams error %d after reset",
1193                              __func__, err);
1194                 return -EIO;
1195         }
1196
1197         spin_lock_irqsave(shost->host_lock, flags);
1198         scsi_report_bus_reset(shost, 0);
1199         spin_unlock_irqrestore(shost->host_lock, flags);
1200
1201         return 0;
1202 }
1203
1204 static void uas_disconnect(struct usb_interface *intf)
1205 {
1206         struct Scsi_Host *shost = usb_get_intfdata(intf);
1207         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1208         unsigned long flags;
1209
1210         spin_lock_irqsave(&devinfo->lock, flags);
1211         devinfo->resetting = 1;
1212         spin_unlock_irqrestore(&devinfo->lock, flags);
1213
1214         cancel_work_sync(&devinfo->work);
1215         usb_kill_anchored_urbs(&devinfo->cmd_urbs);
1216         usb_kill_anchored_urbs(&devinfo->sense_urbs);
1217         usb_kill_anchored_urbs(&devinfo->data_urbs);
1218         uas_zap_pending(devinfo, DID_NO_CONNECT);
1219
1220         /*
1221          * Prevent SCSI scanning (if it hasn't started yet)
1222          * or wait for the SCSI-scanning routine to stop.
1223          */
1224         cancel_work_sync(&devinfo->scan_work);
1225
1226         scsi_remove_host(shost);
1227         uas_free_streams(devinfo);
1228         scsi_host_put(shost);
1229 }
1230
1231 /*
1232  * Put the device back in usb-storage mode on shutdown, as some BIOS-es
1233  * hang on reboot when the device is still in uas mode. Note the reset is
1234  * necessary as some devices won't revert to usb-storage mode without it.
1235  */
1236 static void uas_shutdown(struct usb_interface *intf)
1237 {
1238         struct usb_device *udev = interface_to_usbdev(intf);
1239         struct Scsi_Host *shost = usb_get_intfdata(intf);
1240         struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata;
1241
1242         if (system_state != SYSTEM_RESTART)
1243                 return;
1244
1245         devinfo->shutdown = 1;
1246         uas_free_streams(devinfo);
1247         usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0);
1248         usb_reset_device(udev);
1249 }
1250
1251 static struct usb_driver uas_driver = {
1252         .name = "uas",
1253         .probe = uas_probe,
1254         .disconnect = uas_disconnect,
1255         .pre_reset = uas_pre_reset,
1256         .post_reset = uas_post_reset,
1257         .suspend = uas_suspend,
1258         .resume = uas_resume,
1259         .reset_resume = uas_reset_resume,
1260         .shutdown = uas_shutdown,
1261         .id_table = uas_usb_ids,
1262 };
1263
1264 static int __init uas_init(void)
1265 {
1266         int rv;
1267
1268         workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0);
1269         if (!workqueue)
1270                 return -ENOMEM;
1271
1272         rv = usb_register(&uas_driver);
1273         if (rv) {
1274                 destroy_workqueue(workqueue);
1275                 return -ENOMEM;
1276         }
1277
1278         return 0;
1279 }
1280
1281 static void __exit uas_exit(void)
1282 {
1283         usb_deregister(&uas_driver);
1284         destroy_workqueue(workqueue);
1285 }
1286
1287 module_init(uas_init);
1288 module_exit(uas_exit);
1289
1290 MODULE_DESCRIPTION("USB Attached SCSI driver");
1291 MODULE_LICENSE("GPL");
1292 MODULE_IMPORT_NS(USB_STORAGE);
1293 MODULE_AUTHOR(
1294         "Hans de Goede <[email protected]>, Matthew Wilcox and Sarah Sharp");