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