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 <hdegoede@redhat.com> 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_cmnd.h> 25 #include <scsi/scsi_device.h> 26 #include <scsi/scsi_host.h> 27 #include <scsi/scsi_tcq.h> 28 29 #include "uas-detect.h" 30 #include "scsiglue.h" 31 32 #define MAX_CMNDS 256 33 34 struct uas_dev_info { 35 struct usb_interface *intf; 36 struct usb_device *udev; 37 struct usb_anchor cmd_urbs; 38 struct usb_anchor sense_urbs; 39 struct usb_anchor data_urbs; 40 unsigned long flags; 41 int qdepth, resetting; 42 unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe; 43 unsigned use_streams:1; 44 unsigned shutdown:1; 45 struct scsi_cmnd *cmnd[MAX_CMNDS]; 46 spinlock_t lock; 47 struct work_struct work; 48 struct work_struct scan_work; /* for async scanning */ 49 }; 50 51 enum { 52 SUBMIT_STATUS_URB = BIT(1), 53 ALLOC_DATA_IN_URB = BIT(2), 54 SUBMIT_DATA_IN_URB = BIT(3), 55 ALLOC_DATA_OUT_URB = BIT(4), 56 SUBMIT_DATA_OUT_URB = BIT(5), 57 ALLOC_CMD_URB = BIT(6), 58 SUBMIT_CMD_URB = BIT(7), 59 COMMAND_INFLIGHT = BIT(8), 60 DATA_IN_URB_INFLIGHT = BIT(9), 61 DATA_OUT_URB_INFLIGHT = BIT(10), 62 COMMAND_ABORTED = BIT(11), 63 IS_IN_WORK_LIST = BIT(12), 64 }; 65 66 /* Overrides scsi_pointer */ 67 struct uas_cmd_info { 68 unsigned int state; 69 unsigned int uas_tag; 70 struct urb *cmd_urb; 71 struct urb *data_in_urb; 72 struct urb *data_out_urb; 73 }; 74 75 /* I hate forward declarations, but I actually have a loop */ 76 static int uas_submit_urbs(struct scsi_cmnd *cmnd, 77 struct uas_dev_info *devinfo); 78 static void uas_do_work(struct work_struct *work); 79 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller); 80 static void uas_free_streams(struct uas_dev_info *devinfo); 81 static void uas_log_cmd_state(struct scsi_cmnd *cmnd, const char *prefix, 82 int status); 83 84 /* 85 * This driver needs its own workqueue, as we need to control memory allocation. 86 * 87 * In the course of error handling and power management uas_wait_for_pending_cmnds() 88 * needs to flush pending work items. In these contexts we cannot allocate memory 89 * by doing block IO as we would deadlock. For the same reason we cannot wait 90 * for anything allocating memory not heeding these constraints. 91 * 92 * So we have to control all work items that can be on the workqueue we flush. 93 * Hence we cannot share a queue and need our own. 94 */ 95 static struct workqueue_struct *workqueue; 96 97 static void uas_do_work(struct work_struct *work) 98 { 99 struct uas_dev_info *devinfo = 100 container_of(work, struct uas_dev_info, work); 101 struct uas_cmd_info *cmdinfo; 102 struct scsi_cmnd *cmnd; 103 unsigned long flags; 104 int i, err; 105 106 spin_lock_irqsave(&devinfo->lock, flags); 107 108 if (devinfo->resetting) 109 goto out; 110 111 for (i = 0; i < devinfo->qdepth; i++) { 112 if (!devinfo->cmnd[i]) 113 continue; 114 115 cmnd = devinfo->cmnd[i]; 116 cmdinfo = (void *)&cmnd->SCp; 117 118 if (!(cmdinfo->state & IS_IN_WORK_LIST)) 119 continue; 120 121 err = uas_submit_urbs(cmnd, cmnd->device->hostdata); 122 if (!err) 123 cmdinfo->state &= ~IS_IN_WORK_LIST; 124 else 125 queue_work(workqueue, &devinfo->work); 126 } 127 out: 128 spin_unlock_irqrestore(&devinfo->lock, flags); 129 } 130 131 static void uas_scan_work(struct work_struct *work) 132 { 133 struct uas_dev_info *devinfo = 134 container_of(work, struct uas_dev_info, scan_work); 135 struct Scsi_Host *shost = usb_get_intfdata(devinfo->intf); 136 137 dev_dbg(&devinfo->intf->dev, "starting scan\n"); 138 scsi_scan_host(shost); 139 dev_dbg(&devinfo->intf->dev, "scan complete\n"); 140 } 141 142 static void uas_add_work(struct uas_cmd_info *cmdinfo) 143 { 144 struct scsi_pointer *scp = (void *)cmdinfo; 145 struct scsi_cmnd *cmnd = container_of(scp, struct scsi_cmnd, SCp); 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 = (void *)&cmnd->SCp; 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 = (void *)&cmnd->SCp; 204 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 205 206 if (status == -ENODEV) /* too late */ 207 return; 208 209 scmd_printk(KERN_INFO, cmnd, 210 "%s %d uas-tag %d inflight:%s%s%s%s%s%s%s%s%s%s%s%s ", 211 prefix, status, cmdinfo->uas_tag, 212 (ci->state & SUBMIT_STATUS_URB) ? " s-st" : "", 213 (ci->state & ALLOC_DATA_IN_URB) ? " a-in" : "", 214 (ci->state & SUBMIT_DATA_IN_URB) ? " s-in" : "", 215 (ci->state & ALLOC_DATA_OUT_URB) ? " a-out" : "", 216 (ci->state & SUBMIT_DATA_OUT_URB) ? " s-out" : "", 217 (ci->state & ALLOC_CMD_URB) ? " a-cmd" : "", 218 (ci->state & SUBMIT_CMD_URB) ? " s-cmd" : "", 219 (ci->state & COMMAND_INFLIGHT) ? " CMD" : "", 220 (ci->state & DATA_IN_URB_INFLIGHT) ? " IN" : "", 221 (ci->state & DATA_OUT_URB_INFLIGHT) ? " OUT" : "", 222 (ci->state & COMMAND_ABORTED) ? " abort" : "", 223 (ci->state & IS_IN_WORK_LIST) ? " work" : ""); 224 scsi_print_command(cmnd); 225 } 226 227 static void uas_free_unsubmitted_urbs(struct scsi_cmnd *cmnd) 228 { 229 struct uas_cmd_info *cmdinfo; 230 231 if (!cmnd) 232 return; 233 234 cmdinfo = (void *)&cmnd->SCp; 235 236 if (cmdinfo->state & SUBMIT_CMD_URB) 237 usb_free_urb(cmdinfo->cmd_urb); 238 239 /* data urbs may have never gotten their submit flag set */ 240 if (!(cmdinfo->state & DATA_IN_URB_INFLIGHT)) 241 usb_free_urb(cmdinfo->data_in_urb); 242 if (!(cmdinfo->state & DATA_OUT_URB_INFLIGHT)) 243 usb_free_urb(cmdinfo->data_out_urb); 244 } 245 246 static int uas_try_complete(struct scsi_cmnd *cmnd, const char *caller) 247 { 248 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 249 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 250 251 lockdep_assert_held(&devinfo->lock); 252 if (cmdinfo->state & (COMMAND_INFLIGHT | 253 DATA_IN_URB_INFLIGHT | 254 DATA_OUT_URB_INFLIGHT | 255 COMMAND_ABORTED)) 256 return -EBUSY; 257 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; 258 uas_free_unsubmitted_urbs(cmnd); 259 cmnd->scsi_done(cmnd); 260 return 0; 261 } 262 263 static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd, 264 unsigned direction) 265 { 266 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 267 int err; 268 269 cmdinfo->state |= direction | SUBMIT_STATUS_URB; 270 err = uas_submit_urbs(cmnd, cmnd->device->hostdata); 271 if (err) { 272 uas_add_work(cmdinfo); 273 } 274 } 275 276 static bool uas_evaluate_response_iu(struct response_iu *riu, struct scsi_cmnd *cmnd) 277 { 278 u8 response_code = riu->response_code; 279 280 switch (response_code) { 281 case RC_INCORRECT_LUN: 282 set_host_byte(cmnd, DID_BAD_TARGET); 283 break; 284 case RC_TMF_SUCCEEDED: 285 set_host_byte(cmnd, DID_OK); 286 break; 287 case RC_TMF_NOT_SUPPORTED: 288 set_host_byte(cmnd, DID_TARGET_FAILURE); 289 break; 290 default: 291 uas_log_cmd_state(cmnd, "response iu", response_code); 292 set_host_byte(cmnd, DID_ERROR); 293 break; 294 } 295 296 return response_code == RC_TMF_SUCCEEDED; 297 } 298 299 static void uas_stat_cmplt(struct urb *urb) 300 { 301 struct iu *iu = urb->transfer_buffer; 302 struct Scsi_Host *shost = urb->context; 303 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 304 struct urb *data_in_urb = NULL; 305 struct urb *data_out_urb = NULL; 306 struct scsi_cmnd *cmnd; 307 struct uas_cmd_info *cmdinfo; 308 unsigned long flags; 309 unsigned int idx; 310 int status = urb->status; 311 bool success; 312 313 spin_lock_irqsave(&devinfo->lock, flags); 314 315 if (devinfo->resetting) 316 goto out; 317 318 if (status) { 319 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN) 320 dev_err(&urb->dev->dev, "stat urb: status %d\n", status); 321 goto out; 322 } 323 324 idx = be16_to_cpup(&iu->tag) - 1; 325 if (idx >= MAX_CMNDS || !devinfo->cmnd[idx]) { 326 dev_err(&urb->dev->dev, 327 "stat urb: no pending cmd for uas-tag %d\n", idx + 1); 328 goto out; 329 } 330 331 cmnd = devinfo->cmnd[idx]; 332 cmdinfo = (void *)&cmnd->SCp; 333 334 if (!(cmdinfo->state & COMMAND_INFLIGHT)) { 335 uas_log_cmd_state(cmnd, "unexpected status cmplt", 0); 336 goto out; 337 } 338 339 switch (iu->iu_id) { 340 case IU_ID_STATUS: 341 uas_sense(urb, cmnd); 342 if (cmnd->result != 0) { 343 /* cancel data transfers on error */ 344 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 345 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 346 } 347 cmdinfo->state &= ~COMMAND_INFLIGHT; 348 uas_try_complete(cmnd, __func__); 349 break; 350 case IU_ID_READ_READY: 351 if (!cmdinfo->data_in_urb || 352 (cmdinfo->state & DATA_IN_URB_INFLIGHT)) { 353 uas_log_cmd_state(cmnd, "unexpected read rdy", 0); 354 break; 355 } 356 uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB); 357 break; 358 case IU_ID_WRITE_READY: 359 if (!cmdinfo->data_out_urb || 360 (cmdinfo->state & DATA_OUT_URB_INFLIGHT)) { 361 uas_log_cmd_state(cmnd, "unexpected write rdy", 0); 362 break; 363 } 364 uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB); 365 break; 366 case IU_ID_RESPONSE: 367 cmdinfo->state &= ~COMMAND_INFLIGHT; 368 success = uas_evaluate_response_iu((struct response_iu *)iu, cmnd); 369 if (!success) { 370 /* Error, cancel data transfers */ 371 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 372 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 373 } 374 uas_try_complete(cmnd, __func__); 375 break; 376 default: 377 uas_log_cmd_state(cmnd, "bogus IU", iu->iu_id); 378 } 379 out: 380 usb_free_urb(urb); 381 spin_unlock_irqrestore(&devinfo->lock, flags); 382 383 /* Unlinking of data urbs must be done without holding the lock */ 384 if (data_in_urb) { 385 usb_unlink_urb(data_in_urb); 386 usb_put_urb(data_in_urb); 387 } 388 if (data_out_urb) { 389 usb_unlink_urb(data_out_urb); 390 usb_put_urb(data_out_urb); 391 } 392 } 393 394 static void uas_data_cmplt(struct urb *urb) 395 { 396 struct scsi_cmnd *cmnd = urb->context; 397 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 398 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 399 struct scsi_data_buffer *sdb = &cmnd->sdb; 400 unsigned long flags; 401 int status = urb->status; 402 403 spin_lock_irqsave(&devinfo->lock, flags); 404 405 if (cmdinfo->data_in_urb == urb) { 406 cmdinfo->state &= ~DATA_IN_URB_INFLIGHT; 407 cmdinfo->data_in_urb = NULL; 408 } else if (cmdinfo->data_out_urb == urb) { 409 cmdinfo->state &= ~DATA_OUT_URB_INFLIGHT; 410 cmdinfo->data_out_urb = NULL; 411 } 412 413 if (devinfo->resetting) 414 goto out; 415 416 /* Data urbs should not complete before the cmd urb is submitted */ 417 if (cmdinfo->state & SUBMIT_CMD_URB) { 418 uas_log_cmd_state(cmnd, "unexpected data cmplt", 0); 419 goto out; 420 } 421 422 if (status) { 423 if (status != -ENOENT && status != -ECONNRESET && status != -ESHUTDOWN) 424 uas_log_cmd_state(cmnd, "data cmplt err", status); 425 /* error: no data transfered */ 426 scsi_set_resid(cmnd, sdb->length); 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 = (void *)&cmnd->SCp; 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 = (void *)&cmnd->SCp; 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 = (void *)&cmnd->SCp; 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 struct urb *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 NULL; 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 return NULL; 554 } 555 return urb; 556 } 557 558 static int uas_submit_urbs(struct scsi_cmnd *cmnd, 559 struct uas_dev_info *devinfo) 560 { 561 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 562 struct urb *urb; 563 int err; 564 565 lockdep_assert_held(&devinfo->lock); 566 if (cmdinfo->state & SUBMIT_STATUS_URB) { 567 urb = uas_submit_sense_urb(cmnd, GFP_ATOMIC); 568 if (!urb) 569 return SCSI_MLQUEUE_DEVICE_BUSY; 570 cmdinfo->state &= ~SUBMIT_STATUS_URB; 571 } 572 573 if (cmdinfo->state & ALLOC_DATA_IN_URB) { 574 cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC, 575 cmnd, DMA_FROM_DEVICE); 576 if (!cmdinfo->data_in_urb) 577 return SCSI_MLQUEUE_DEVICE_BUSY; 578 cmdinfo->state &= ~ALLOC_DATA_IN_URB; 579 } 580 581 if (cmdinfo->state & SUBMIT_DATA_IN_URB) { 582 usb_anchor_urb(cmdinfo->data_in_urb, &devinfo->data_urbs); 583 err = usb_submit_urb(cmdinfo->data_in_urb, GFP_ATOMIC); 584 if (err) { 585 usb_unanchor_urb(cmdinfo->data_in_urb); 586 uas_log_cmd_state(cmnd, "data in submit err", err); 587 return SCSI_MLQUEUE_DEVICE_BUSY; 588 } 589 cmdinfo->state &= ~SUBMIT_DATA_IN_URB; 590 cmdinfo->state |= DATA_IN_URB_INFLIGHT; 591 } 592 593 if (cmdinfo->state & ALLOC_DATA_OUT_URB) { 594 cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, GFP_ATOMIC, 595 cmnd, DMA_TO_DEVICE); 596 if (!cmdinfo->data_out_urb) 597 return SCSI_MLQUEUE_DEVICE_BUSY; 598 cmdinfo->state &= ~ALLOC_DATA_OUT_URB; 599 } 600 601 if (cmdinfo->state & SUBMIT_DATA_OUT_URB) { 602 usb_anchor_urb(cmdinfo->data_out_urb, &devinfo->data_urbs); 603 err = usb_submit_urb(cmdinfo->data_out_urb, GFP_ATOMIC); 604 if (err) { 605 usb_unanchor_urb(cmdinfo->data_out_urb); 606 uas_log_cmd_state(cmnd, "data out submit err", err); 607 return SCSI_MLQUEUE_DEVICE_BUSY; 608 } 609 cmdinfo->state &= ~SUBMIT_DATA_OUT_URB; 610 cmdinfo->state |= DATA_OUT_URB_INFLIGHT; 611 } 612 613 if (cmdinfo->state & ALLOC_CMD_URB) { 614 cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, GFP_ATOMIC, cmnd); 615 if (!cmdinfo->cmd_urb) 616 return SCSI_MLQUEUE_DEVICE_BUSY; 617 cmdinfo->state &= ~ALLOC_CMD_URB; 618 } 619 620 if (cmdinfo->state & SUBMIT_CMD_URB) { 621 usb_anchor_urb(cmdinfo->cmd_urb, &devinfo->cmd_urbs); 622 err = usb_submit_urb(cmdinfo->cmd_urb, GFP_ATOMIC); 623 if (err) { 624 usb_unanchor_urb(cmdinfo->cmd_urb); 625 uas_log_cmd_state(cmnd, "cmd submit err", err); 626 return SCSI_MLQUEUE_DEVICE_BUSY; 627 } 628 cmdinfo->cmd_urb = NULL; 629 cmdinfo->state &= ~SUBMIT_CMD_URB; 630 cmdinfo->state |= COMMAND_INFLIGHT; 631 } 632 633 return 0; 634 } 635 636 static int uas_queuecommand_lck(struct scsi_cmnd *cmnd, 637 void (*done)(struct scsi_cmnd *)) 638 { 639 struct scsi_device *sdev = cmnd->device; 640 struct uas_dev_info *devinfo = sdev->hostdata; 641 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 642 unsigned long flags; 643 int idx, err; 644 645 BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer)); 646 647 /* Re-check scsi_block_requests now that we've the host-lock */ 648 if (cmnd->device->host->host_self_blocked) 649 return SCSI_MLQUEUE_DEVICE_BUSY; 650 651 if ((devinfo->flags & US_FL_NO_ATA_1X) && 652 (cmnd->cmnd[0] == ATA_12 || cmnd->cmnd[0] == ATA_16)) { 653 memcpy(cmnd->sense_buffer, usb_stor_sense_invalidCDB, 654 sizeof(usb_stor_sense_invalidCDB)); 655 cmnd->result = SAM_STAT_CHECK_CONDITION; 656 cmnd->scsi_done(cmnd); 657 return 0; 658 } 659 660 spin_lock_irqsave(&devinfo->lock, flags); 661 662 if (devinfo->resetting) { 663 set_host_byte(cmnd, DID_ERROR); 664 cmnd->scsi_done(cmnd); 665 goto zombie; 666 } 667 668 /* Find a free uas-tag */ 669 for (idx = 0; idx < devinfo->qdepth; idx++) { 670 if (!devinfo->cmnd[idx]) 671 break; 672 } 673 if (idx == devinfo->qdepth) { 674 spin_unlock_irqrestore(&devinfo->lock, flags); 675 return SCSI_MLQUEUE_DEVICE_BUSY; 676 } 677 678 cmnd->scsi_done = done; 679 680 memset(cmdinfo, 0, sizeof(*cmdinfo)); 681 cmdinfo->uas_tag = idx + 1; /* uas-tag == usb-stream-id, so 1 based */ 682 cmdinfo->state = SUBMIT_STATUS_URB | ALLOC_CMD_URB | SUBMIT_CMD_URB; 683 684 switch (cmnd->sc_data_direction) { 685 case DMA_FROM_DEVICE: 686 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 687 break; 688 case DMA_BIDIRECTIONAL: 689 cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB; 690 fallthrough; 691 case DMA_TO_DEVICE: 692 cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB; 693 case DMA_NONE: 694 break; 695 } 696 697 if (!devinfo->use_streams) 698 cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB); 699 700 err = uas_submit_urbs(cmnd, devinfo); 701 /* 702 * in case of fatal errors the SCSI layer is peculiar 703 * a command that has finished is a success for the purpose 704 * of queueing, no matter how fatal the error 705 */ 706 if (err == -ENODEV) { 707 set_host_byte(cmnd, DID_ERROR); 708 cmnd->scsi_done(cmnd); 709 goto zombie; 710 } 711 if (err) { 712 /* If we did nothing, give up now */ 713 if (cmdinfo->state & SUBMIT_STATUS_URB) { 714 spin_unlock_irqrestore(&devinfo->lock, flags); 715 return SCSI_MLQUEUE_DEVICE_BUSY; 716 } 717 uas_add_work(cmdinfo); 718 } 719 720 devinfo->cmnd[idx] = cmnd; 721 zombie: 722 spin_unlock_irqrestore(&devinfo->lock, flags); 723 return 0; 724 } 725 726 static DEF_SCSI_QCMD(uas_queuecommand) 727 728 /* 729 * For now we do not support actually sending an abort to the device, so 730 * this eh always fails. Still we must define it to make sure that we've 731 * dropped all references to the cmnd in question once this function exits. 732 */ 733 static int uas_eh_abort_handler(struct scsi_cmnd *cmnd) 734 { 735 struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp; 736 struct uas_dev_info *devinfo = (void *)cmnd->device->hostdata; 737 struct urb *data_in_urb = NULL; 738 struct urb *data_out_urb = NULL; 739 unsigned long flags; 740 741 spin_lock_irqsave(&devinfo->lock, flags); 742 743 uas_log_cmd_state(cmnd, __func__, 0); 744 745 /* Ensure that try_complete does not call scsi_done */ 746 cmdinfo->state |= COMMAND_ABORTED; 747 748 /* Drop all refs to this cmnd, kill data urbs to break their ref */ 749 devinfo->cmnd[cmdinfo->uas_tag - 1] = NULL; 750 if (cmdinfo->state & DATA_IN_URB_INFLIGHT) 751 data_in_urb = usb_get_urb(cmdinfo->data_in_urb); 752 if (cmdinfo->state & DATA_OUT_URB_INFLIGHT) 753 data_out_urb = usb_get_urb(cmdinfo->data_out_urb); 754 755 uas_free_unsubmitted_urbs(cmnd); 756 757 spin_unlock_irqrestore(&devinfo->lock, flags); 758 759 if (data_in_urb) { 760 usb_kill_urb(data_in_urb); 761 usb_put_urb(data_in_urb); 762 } 763 if (data_out_urb) { 764 usb_kill_urb(data_out_urb); 765 usb_put_urb(data_out_urb); 766 } 767 768 return FAILED; 769 } 770 771 static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd) 772 { 773 struct scsi_device *sdev = cmnd->device; 774 struct uas_dev_info *devinfo = sdev->hostdata; 775 struct usb_device *udev = devinfo->udev; 776 unsigned long flags; 777 int err; 778 779 err = usb_lock_device_for_reset(udev, devinfo->intf); 780 if (err) { 781 shost_printk(KERN_ERR, sdev->host, 782 "%s FAILED to get lock err %d\n", __func__, err); 783 return FAILED; 784 } 785 786 shost_printk(KERN_INFO, sdev->host, "%s start\n", __func__); 787 788 spin_lock_irqsave(&devinfo->lock, flags); 789 devinfo->resetting = 1; 790 spin_unlock_irqrestore(&devinfo->lock, flags); 791 792 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 793 usb_kill_anchored_urbs(&devinfo->sense_urbs); 794 usb_kill_anchored_urbs(&devinfo->data_urbs); 795 uas_zap_pending(devinfo, DID_RESET); 796 797 err = usb_reset_device(udev); 798 799 spin_lock_irqsave(&devinfo->lock, flags); 800 devinfo->resetting = 0; 801 spin_unlock_irqrestore(&devinfo->lock, flags); 802 803 usb_unlock_device(udev); 804 805 if (err) { 806 shost_printk(KERN_INFO, sdev->host, "%s FAILED err %d\n", 807 __func__, err); 808 return FAILED; 809 } 810 811 shost_printk(KERN_INFO, sdev->host, "%s success\n", __func__); 812 return SUCCESS; 813 } 814 815 static int uas_target_alloc(struct scsi_target *starget) 816 { 817 struct uas_dev_info *devinfo = (struct uas_dev_info *) 818 dev_to_shost(starget->dev.parent)->hostdata; 819 820 if (devinfo->flags & US_FL_NO_REPORT_LUNS) 821 starget->no_report_luns = 1; 822 823 return 0; 824 } 825 826 static int uas_slave_alloc(struct scsi_device *sdev) 827 { 828 struct uas_dev_info *devinfo = 829 (struct uas_dev_info *)sdev->host->hostdata; 830 831 sdev->hostdata = devinfo; 832 833 /* 834 * The protocol has no requirements on alignment in the strict sense. 835 * Controllers may or may not have alignment restrictions. 836 * As this is not exported, we use an extremely conservative guess. 837 */ 838 blk_queue_update_dma_alignment(sdev->request_queue, (512 - 1)); 839 840 return 0; 841 } 842 843 static int uas_slave_configure(struct scsi_device *sdev) 844 { 845 struct uas_dev_info *devinfo = sdev->hostdata; 846 struct device *dev = sdev->host->dma_dev; 847 848 if (devinfo->flags & US_FL_MAX_SECTORS_64) 849 blk_queue_max_hw_sectors(sdev->request_queue, 64); 850 else if (devinfo->flags & US_FL_MAX_SECTORS_240) 851 blk_queue_max_hw_sectors(sdev->request_queue, 240); 852 else if (devinfo->udev->speed >= USB_SPEED_SUPER) 853 blk_queue_max_hw_sectors(sdev->request_queue, 2048); 854 855 blk_queue_max_hw_sectors(sdev->request_queue, 856 min_t(size_t, queue_max_hw_sectors(sdev->request_queue), 857 dma_max_mapping_size(dev) >> SECTOR_SHIFT)); 858 859 if (devinfo->flags & US_FL_NO_REPORT_OPCODES) 860 sdev->no_report_opcodes = 1; 861 862 /* A few buggy USB-ATA bridges don't understand FUA */ 863 if (devinfo->flags & US_FL_BROKEN_FUA) 864 sdev->broken_fua = 1; 865 866 /* UAS also needs to support FL_ALWAYS_SYNC */ 867 if (devinfo->flags & US_FL_ALWAYS_SYNC) { 868 sdev->skip_ms_page_3f = 1; 869 sdev->skip_ms_page_8 = 1; 870 sdev->wce_default_on = 1; 871 } 872 873 /* Some disks cannot handle READ_CAPACITY_16 */ 874 if (devinfo->flags & US_FL_NO_READ_CAPACITY_16) 875 sdev->no_read_capacity_16 = 1; 876 877 /* 878 * Some disks return the total number of blocks in response 879 * to READ CAPACITY rather than the highest block number. 880 * If this device makes that mistake, tell the sd driver. 881 */ 882 if (devinfo->flags & US_FL_FIX_CAPACITY) 883 sdev->fix_capacity = 1; 884 885 /* 886 * in some cases we have to guess 887 */ 888 if (devinfo->flags & US_FL_CAPACITY_HEURISTICS) 889 sdev->guess_capacity = 1; 890 891 /* 892 * Some devices don't like MODE SENSE with page=0x3f, 893 * which is the command used for checking if a device 894 * is write-protected. Now that we tell the sd driver 895 * to do a 192-byte transfer with this command the 896 * majority of devices work fine, but a few still can't 897 * handle it. The sd driver will simply assume those 898 * devices are write-enabled. 899 */ 900 if (devinfo->flags & US_FL_NO_WP_DETECT) 901 sdev->skip_ms_page_3f = 1; 902 903 scsi_change_queue_depth(sdev, devinfo->qdepth - 2); 904 return 0; 905 } 906 907 static struct scsi_host_template uas_host_template = { 908 .module = THIS_MODULE, 909 .name = "uas", 910 .queuecommand = uas_queuecommand, 911 .target_alloc = uas_target_alloc, 912 .slave_alloc = uas_slave_alloc, 913 .slave_configure = uas_slave_configure, 914 .eh_abort_handler = uas_eh_abort_handler, 915 .eh_device_reset_handler = uas_eh_device_reset_handler, 916 .this_id = -1, 917 .skip_settle_delay = 1, 918 .dma_boundary = PAGE_SIZE - 1, 919 }; 920 921 #define UNUSUAL_DEV(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax, \ 922 vendorName, productName, useProtocol, useTransport, \ 923 initFunction, flags) \ 924 { USB_DEVICE_VER(id_vendor, id_product, bcdDeviceMin, bcdDeviceMax), \ 925 .driver_info = (flags) } 926 927 static struct usb_device_id uas_usb_ids[] = { 928 # include "unusual_uas.h" 929 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) }, 930 { USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) }, 931 { } 932 }; 933 MODULE_DEVICE_TABLE(usb, uas_usb_ids); 934 935 #undef UNUSUAL_DEV 936 937 static int uas_switch_interface(struct usb_device *udev, 938 struct usb_interface *intf) 939 { 940 struct usb_host_interface *alt; 941 942 alt = uas_find_uas_alt_setting(intf); 943 if (!alt) 944 return -ENODEV; 945 946 return usb_set_interface(udev, alt->desc.bInterfaceNumber, 947 alt->desc.bAlternateSetting); 948 } 949 950 static int uas_configure_endpoints(struct uas_dev_info *devinfo) 951 { 952 struct usb_host_endpoint *eps[4] = { }; 953 struct usb_device *udev = devinfo->udev; 954 int r; 955 956 r = uas_find_endpoints(devinfo->intf->cur_altsetting, eps); 957 if (r) 958 return r; 959 960 devinfo->cmd_pipe = usb_sndbulkpipe(udev, 961 usb_endpoint_num(&eps[0]->desc)); 962 devinfo->status_pipe = usb_rcvbulkpipe(udev, 963 usb_endpoint_num(&eps[1]->desc)); 964 devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 965 usb_endpoint_num(&eps[2]->desc)); 966 devinfo->data_out_pipe = usb_sndbulkpipe(udev, 967 usb_endpoint_num(&eps[3]->desc)); 968 969 if (udev->speed < USB_SPEED_SUPER) { 970 devinfo->qdepth = 32; 971 devinfo->use_streams = 0; 972 } else { 973 devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 974 3, MAX_CMNDS, GFP_NOIO); 975 if (devinfo->qdepth < 0) 976 return devinfo->qdepth; 977 devinfo->use_streams = 1; 978 } 979 980 return 0; 981 } 982 983 static void uas_free_streams(struct uas_dev_info *devinfo) 984 { 985 struct usb_device *udev = devinfo->udev; 986 struct usb_host_endpoint *eps[3]; 987 988 eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe); 989 eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe); 990 eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe); 991 usb_free_streams(devinfo->intf, eps, 3, GFP_NOIO); 992 } 993 994 static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id) 995 { 996 int result = -ENOMEM; 997 struct Scsi_Host *shost = NULL; 998 struct uas_dev_info *devinfo; 999 struct usb_device *udev = interface_to_usbdev(intf); 1000 unsigned long dev_flags; 1001 1002 if (!uas_use_uas_driver(intf, id, &dev_flags)) 1003 return -ENODEV; 1004 1005 if (uas_switch_interface(udev, intf)) 1006 return -ENODEV; 1007 1008 shost = scsi_host_alloc(&uas_host_template, 1009 sizeof(struct uas_dev_info)); 1010 if (!shost) 1011 goto set_alt0; 1012 1013 shost->max_cmd_len = 16 + 252; 1014 shost->max_id = 1; 1015 shost->max_lun = 256; 1016 shost->max_channel = 0; 1017 shost->sg_tablesize = udev->bus->sg_tablesize; 1018 1019 devinfo = (struct uas_dev_info *)shost->hostdata; 1020 devinfo->intf = intf; 1021 devinfo->udev = udev; 1022 devinfo->resetting = 0; 1023 devinfo->shutdown = 0; 1024 devinfo->flags = dev_flags; 1025 init_usb_anchor(&devinfo->cmd_urbs); 1026 init_usb_anchor(&devinfo->sense_urbs); 1027 init_usb_anchor(&devinfo->data_urbs); 1028 spin_lock_init(&devinfo->lock); 1029 INIT_WORK(&devinfo->work, uas_do_work); 1030 INIT_WORK(&devinfo->scan_work, uas_scan_work); 1031 1032 result = uas_configure_endpoints(devinfo); 1033 if (result) 1034 goto set_alt0; 1035 1036 /* 1037 * 1 tag is reserved for untagged commands + 1038 * 1 tag to avoid off by one errors in some bridge firmwares 1039 */ 1040 shost->can_queue = devinfo->qdepth - 2; 1041 1042 usb_set_intfdata(intf, shost); 1043 result = scsi_add_host_with_dma(shost, &intf->dev, udev->bus->sysdev); 1044 if (result) 1045 goto free_streams; 1046 1047 /* Submit the delayed_work for SCSI-device scanning */ 1048 schedule_work(&devinfo->scan_work); 1049 1050 return result; 1051 1052 free_streams: 1053 uas_free_streams(devinfo); 1054 usb_set_intfdata(intf, NULL); 1055 set_alt0: 1056 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); 1057 if (shost) 1058 scsi_host_put(shost); 1059 return result; 1060 } 1061 1062 static int uas_cmnd_list_empty(struct uas_dev_info *devinfo) 1063 { 1064 unsigned long flags; 1065 int i, r = 1; 1066 1067 spin_lock_irqsave(&devinfo->lock, flags); 1068 1069 for (i = 0; i < devinfo->qdepth; i++) { 1070 if (devinfo->cmnd[i]) { 1071 r = 0; /* Not empty */ 1072 break; 1073 } 1074 } 1075 1076 spin_unlock_irqrestore(&devinfo->lock, flags); 1077 1078 return r; 1079 } 1080 1081 /* 1082 * Wait for any pending cmnds to complete, on usb-2 sense_urbs may temporarily 1083 * get empty while there still is more work to do due to sense-urbs completing 1084 * with a READ/WRITE_READY iu code, so keep waiting until the list gets empty. 1085 */ 1086 static int uas_wait_for_pending_cmnds(struct uas_dev_info *devinfo) 1087 { 1088 unsigned long start_time; 1089 int r; 1090 1091 start_time = jiffies; 1092 do { 1093 flush_work(&devinfo->work); 1094 1095 r = usb_wait_anchor_empty_timeout(&devinfo->sense_urbs, 5000); 1096 if (r == 0) 1097 return -ETIME; 1098 1099 r = usb_wait_anchor_empty_timeout(&devinfo->data_urbs, 500); 1100 if (r == 0) 1101 return -ETIME; 1102 1103 if (time_after(jiffies, start_time + 5 * HZ)) 1104 return -ETIME; 1105 } while (!uas_cmnd_list_empty(devinfo)); 1106 1107 return 0; 1108 } 1109 1110 static int uas_pre_reset(struct usb_interface *intf) 1111 { 1112 struct Scsi_Host *shost = usb_get_intfdata(intf); 1113 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1114 unsigned long flags; 1115 1116 if (devinfo->shutdown) 1117 return 0; 1118 1119 /* Block new requests */ 1120 spin_lock_irqsave(shost->host_lock, flags); 1121 scsi_block_requests(shost); 1122 spin_unlock_irqrestore(shost->host_lock, flags); 1123 1124 if (uas_wait_for_pending_cmnds(devinfo) != 0) { 1125 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); 1126 scsi_unblock_requests(shost); 1127 return 1; 1128 } 1129 1130 uas_free_streams(devinfo); 1131 1132 return 0; 1133 } 1134 1135 static int uas_post_reset(struct usb_interface *intf) 1136 { 1137 struct Scsi_Host *shost = usb_get_intfdata(intf); 1138 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1139 unsigned long flags; 1140 int err; 1141 1142 if (devinfo->shutdown) 1143 return 0; 1144 1145 err = uas_configure_endpoints(devinfo); 1146 if (err && err != -ENODEV) 1147 shost_printk(KERN_ERR, shost, 1148 "%s: alloc streams error %d after reset", 1149 __func__, err); 1150 1151 /* we must unblock the host in every case lest we deadlock */ 1152 spin_lock_irqsave(shost->host_lock, flags); 1153 scsi_report_bus_reset(shost, 0); 1154 spin_unlock_irqrestore(shost->host_lock, flags); 1155 1156 scsi_unblock_requests(shost); 1157 1158 return err ? 1 : 0; 1159 } 1160 1161 static int uas_suspend(struct usb_interface *intf, pm_message_t message) 1162 { 1163 struct Scsi_Host *shost = usb_get_intfdata(intf); 1164 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1165 1166 if (uas_wait_for_pending_cmnds(devinfo) != 0) { 1167 shost_printk(KERN_ERR, shost, "%s: timed out\n", __func__); 1168 return -ETIME; 1169 } 1170 1171 return 0; 1172 } 1173 1174 static int uas_resume(struct usb_interface *intf) 1175 { 1176 return 0; 1177 } 1178 1179 static int uas_reset_resume(struct usb_interface *intf) 1180 { 1181 struct Scsi_Host *shost = usb_get_intfdata(intf); 1182 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1183 unsigned long flags; 1184 int err; 1185 1186 err = uas_configure_endpoints(devinfo); 1187 if (err) { 1188 shost_printk(KERN_ERR, shost, 1189 "%s: alloc streams error %d after reset", 1190 __func__, err); 1191 return -EIO; 1192 } 1193 1194 spin_lock_irqsave(shost->host_lock, flags); 1195 scsi_report_bus_reset(shost, 0); 1196 spin_unlock_irqrestore(shost->host_lock, flags); 1197 1198 return 0; 1199 } 1200 1201 static void uas_disconnect(struct usb_interface *intf) 1202 { 1203 struct Scsi_Host *shost = usb_get_intfdata(intf); 1204 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1205 unsigned long flags; 1206 1207 spin_lock_irqsave(&devinfo->lock, flags); 1208 devinfo->resetting = 1; 1209 spin_unlock_irqrestore(&devinfo->lock, flags); 1210 1211 cancel_work_sync(&devinfo->work); 1212 usb_kill_anchored_urbs(&devinfo->cmd_urbs); 1213 usb_kill_anchored_urbs(&devinfo->sense_urbs); 1214 usb_kill_anchored_urbs(&devinfo->data_urbs); 1215 uas_zap_pending(devinfo, DID_NO_CONNECT); 1216 1217 /* 1218 * Prevent SCSI scanning (if it hasn't started yet) 1219 * or wait for the SCSI-scanning routine to stop. 1220 */ 1221 cancel_work_sync(&devinfo->scan_work); 1222 1223 scsi_remove_host(shost); 1224 uas_free_streams(devinfo); 1225 scsi_host_put(shost); 1226 } 1227 1228 /* 1229 * Put the device back in usb-storage mode on shutdown, as some BIOS-es 1230 * hang on reboot when the device is still in uas mode. Note the reset is 1231 * necessary as some devices won't revert to usb-storage mode without it. 1232 */ 1233 static void uas_shutdown(struct device *dev) 1234 { 1235 struct usb_interface *intf = to_usb_interface(dev); 1236 struct usb_device *udev = interface_to_usbdev(intf); 1237 struct Scsi_Host *shost = usb_get_intfdata(intf); 1238 struct uas_dev_info *devinfo = (struct uas_dev_info *)shost->hostdata; 1239 1240 if (system_state != SYSTEM_RESTART) 1241 return; 1242 1243 devinfo->shutdown = 1; 1244 uas_free_streams(devinfo); 1245 usb_set_interface(udev, intf->altsetting[0].desc.bInterfaceNumber, 0); 1246 usb_reset_device(udev); 1247 } 1248 1249 static struct usb_driver uas_driver = { 1250 .name = "uas", 1251 .probe = uas_probe, 1252 .disconnect = uas_disconnect, 1253 .pre_reset = uas_pre_reset, 1254 .post_reset = uas_post_reset, 1255 .suspend = uas_suspend, 1256 .resume = uas_resume, 1257 .reset_resume = uas_reset_resume, 1258 .drvwrap.driver.shutdown = uas_shutdown, 1259 .id_table = uas_usb_ids, 1260 }; 1261 1262 static int __init uas_init(void) 1263 { 1264 int rv; 1265 1266 workqueue = alloc_workqueue("uas", WQ_MEM_RECLAIM, 0); 1267 if (!workqueue) 1268 return -ENOMEM; 1269 1270 rv = usb_register(&uas_driver); 1271 if (rv) { 1272 destroy_workqueue(workqueue); 1273 return -ENOMEM; 1274 } 1275 1276 return 0; 1277 } 1278 1279 static void __exit uas_exit(void) 1280 { 1281 usb_deregister(&uas_driver); 1282 destroy_workqueue(workqueue); 1283 } 1284 1285 module_init(uas_init); 1286 module_exit(uas_exit); 1287 1288 MODULE_LICENSE("GPL"); 1289 MODULE_IMPORT_NS(USB_STORAGE); 1290 MODULE_AUTHOR( 1291 "Hans de Goede <hdegoede@redhat.com>, Matthew Wilcox and Sarah Sharp"); 1292