1 /* 2 * scsi_scan.c 3 * 4 * Copyright (C) 2000 Eric Youngdale, 5 * Copyright (C) 2002 Patrick Mansfield 6 * 7 * The general scanning/probing algorithm is as follows, exceptions are 8 * made to it depending on device specific flags, compilation options, and 9 * global variable (boot or module load time) settings. 10 * 11 * A specific LUN is scanned via an INQUIRY command; if the LUN has a 12 * device attached, a scsi_device is allocated and setup for it. 13 * 14 * For every id of every channel on the given host: 15 * 16 * Scan LUN 0; if the target responds to LUN 0 (even if there is no 17 * device or storage attached to LUN 0): 18 * 19 * If LUN 0 has a device attached, allocate and setup a 20 * scsi_device for it. 21 * 22 * If target is SCSI-3 or up, issue a REPORT LUN, and scan 23 * all of the LUNs returned by the REPORT LUN; else, 24 * sequentially scan LUNs up until some maximum is reached, 25 * or a LUN is seen that cannot have a device attached to it. 26 */ 27 28 #include <linux/config.h> 29 #include <linux/module.h> 30 #include <linux/moduleparam.h> 31 #include <linux/init.h> 32 #include <linux/blkdev.h> 33 #include <asm/semaphore.h> 34 35 #include <scsi/scsi.h> 36 #include <scsi/scsi_device.h> 37 #include <scsi/scsi_driver.h> 38 #include <scsi/scsi_devinfo.h> 39 #include <scsi/scsi_host.h> 40 #include <scsi/scsi_request.h> 41 #include <scsi/scsi_transport.h> 42 #include <scsi/scsi_eh.h> 43 44 #include "scsi_priv.h" 45 #include "scsi_logging.h" 46 47 #define ALLOC_FAILURE_MSG KERN_ERR "%s: Allocation failure during" \ 48 " SCSI scanning, some SCSI devices might not be configured\n" 49 50 /* 51 * Default timeout 52 */ 53 #define SCSI_TIMEOUT (2*HZ) 54 55 /* 56 * Prefix values for the SCSI id's (stored in driverfs name field) 57 */ 58 #define SCSI_UID_SER_NUM 'S' 59 #define SCSI_UID_UNKNOWN 'Z' 60 61 /* 62 * Return values of some of the scanning functions. 63 * 64 * SCSI_SCAN_NO_RESPONSE: no valid response received from the target, this 65 * includes allocation or general failures preventing IO from being sent. 66 * 67 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is available 68 * on the given LUN. 69 * 70 * SCSI_SCAN_LUN_PRESENT: target responded, and a device is available on a 71 * given LUN. 72 */ 73 #define SCSI_SCAN_NO_RESPONSE 0 74 #define SCSI_SCAN_TARGET_PRESENT 1 75 #define SCSI_SCAN_LUN_PRESENT 2 76 77 static const char *scsi_null_device_strs = "nullnullnullnull"; 78 79 #define MAX_SCSI_LUNS 512 80 81 #ifdef CONFIG_SCSI_MULTI_LUN 82 static unsigned int max_scsi_luns = MAX_SCSI_LUNS; 83 #else 84 static unsigned int max_scsi_luns = 1; 85 #endif 86 87 module_param_named(max_luns, max_scsi_luns, int, S_IRUGO|S_IWUSR); 88 MODULE_PARM_DESC(max_luns, 89 "last scsi LUN (should be between 1 and 2^32-1)"); 90 91 /* 92 * max_scsi_report_luns: the maximum number of LUNS that will be 93 * returned from the REPORT LUNS command. 8 times this value must 94 * be allocated. In theory this could be up to an 8 byte value, but 95 * in practice, the maximum number of LUNs suppored by any device 96 * is about 16k. 97 */ 98 static unsigned int max_scsi_report_luns = 511; 99 100 module_param_named(max_report_luns, max_scsi_report_luns, int, S_IRUGO|S_IWUSR); 101 MODULE_PARM_DESC(max_report_luns, 102 "REPORT LUNS maximum number of LUNS received (should be" 103 " between 1 and 16384)"); 104 105 static unsigned int scsi_inq_timeout = SCSI_TIMEOUT/HZ+3; 106 107 module_param_named(inq_timeout, scsi_inq_timeout, int, S_IRUGO|S_IWUSR); 108 MODULE_PARM_DESC(inq_timeout, 109 "Timeout (in seconds) waiting for devices to answer INQUIRY." 110 " Default is 5. Some non-compliant devices need more."); 111 112 /** 113 * scsi_unlock_floptical - unlock device via a special MODE SENSE command 114 * @sdev: scsi device to send command to 115 * @result: area to store the result of the MODE SENSE 116 * 117 * Description: 118 * Send a vendor specific MODE SENSE (not a MODE SELECT) command. 119 * Called for BLIST_KEY devices. 120 **/ 121 static void scsi_unlock_floptical(struct scsi_device *sdev, 122 unsigned char *result) 123 { 124 unsigned char scsi_cmd[MAX_COMMAND_SIZE]; 125 126 printk(KERN_NOTICE "scsi: unlocking floptical drive\n"); 127 scsi_cmd[0] = MODE_SENSE; 128 scsi_cmd[1] = 0; 129 scsi_cmd[2] = 0x2e; 130 scsi_cmd[3] = 0; 131 scsi_cmd[4] = 0x2a; /* size */ 132 scsi_cmd[5] = 0; 133 scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, result, 0x2a, NULL, 134 SCSI_TIMEOUT, 3); 135 } 136 137 /** 138 * print_inquiry - printk the inquiry information 139 * @inq_result: printk this SCSI INQUIRY 140 * 141 * Description: 142 * printk the vendor, model, and other information found in the 143 * INQUIRY data in @inq_result. 144 * 145 * Notes: 146 * Remove this, and replace with a hotplug event that logs any 147 * relevant information. 148 **/ 149 static void print_inquiry(unsigned char *inq_result) 150 { 151 int i; 152 153 printk(KERN_NOTICE " Vendor: "); 154 for (i = 8; i < 16; i++) 155 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) 156 printk("%c", inq_result[i]); 157 else 158 printk(" "); 159 160 printk(" Model: "); 161 for (i = 16; i < 32; i++) 162 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) 163 printk("%c", inq_result[i]); 164 else 165 printk(" "); 166 167 printk(" Rev: "); 168 for (i = 32; i < 36; i++) 169 if (inq_result[i] >= 0x20 && i < inq_result[4] + 5) 170 printk("%c", inq_result[i]); 171 else 172 printk(" "); 173 174 printk("\n"); 175 176 i = inq_result[0] & 0x1f; 177 178 printk(KERN_NOTICE " Type: %s ", 179 i < 180 MAX_SCSI_DEVICE_CODE ? scsi_device_types[i] : 181 "Unknown "); 182 printk(" ANSI SCSI revision: %02x", 183 inq_result[2] & 0x07); 184 if ((inq_result[2] & 0x07) == 1 && (inq_result[3] & 0x0f) == 1) 185 printk(" CCS\n"); 186 else 187 printk("\n"); 188 } 189 190 /** 191 * scsi_alloc_sdev - allocate and setup a scsi_Device 192 * 193 * Description: 194 * Allocate, initialize for io, and return a pointer to a scsi_Device. 195 * Stores the @shost, @channel, @id, and @lun in the scsi_Device, and 196 * adds scsi_Device to the appropriate list. 197 * 198 * Return value: 199 * scsi_Device pointer, or NULL on failure. 200 **/ 201 static struct scsi_device *scsi_alloc_sdev(struct scsi_target *starget, 202 unsigned int lun, void *hostdata) 203 { 204 struct scsi_device *sdev; 205 int display_failure_msg = 1, ret; 206 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 207 208 sdev = kzalloc(sizeof(*sdev) + shost->transportt->device_size, 209 GFP_ATOMIC); 210 if (!sdev) 211 goto out; 212 213 sdev->vendor = scsi_null_device_strs; 214 sdev->model = scsi_null_device_strs; 215 sdev->rev = scsi_null_device_strs; 216 sdev->host = shost; 217 sdev->id = starget->id; 218 sdev->lun = lun; 219 sdev->channel = starget->channel; 220 sdev->sdev_state = SDEV_CREATED; 221 INIT_LIST_HEAD(&sdev->siblings); 222 INIT_LIST_HEAD(&sdev->same_target_siblings); 223 INIT_LIST_HEAD(&sdev->cmd_list); 224 INIT_LIST_HEAD(&sdev->starved_entry); 225 spin_lock_init(&sdev->list_lock); 226 227 sdev->sdev_gendev.parent = get_device(&starget->dev); 228 sdev->sdev_target = starget; 229 230 /* usually NULL and set by ->slave_alloc instead */ 231 sdev->hostdata = hostdata; 232 233 /* if the device needs this changing, it may do so in the 234 * slave_configure function */ 235 sdev->max_device_blocked = SCSI_DEFAULT_DEVICE_BLOCKED; 236 237 /* 238 * Some low level driver could use device->type 239 */ 240 sdev->type = -1; 241 242 /* 243 * Assume that the device will have handshaking problems, 244 * and then fix this field later if it turns out it 245 * doesn't 246 */ 247 sdev->borken = 1; 248 249 sdev->request_queue = scsi_alloc_queue(sdev); 250 if (!sdev->request_queue) { 251 /* release fn is set up in scsi_sysfs_device_initialise, so 252 * have to free and put manually here */ 253 put_device(&starget->dev); 254 kfree(sdev); 255 goto out; 256 } 257 258 sdev->request_queue->queuedata = sdev; 259 scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); 260 261 scsi_sysfs_device_initialize(sdev); 262 263 if (shost->hostt->slave_alloc) { 264 ret = shost->hostt->slave_alloc(sdev); 265 if (ret) { 266 /* 267 * if LLDD reports slave not present, don't clutter 268 * console with alloc failure messages 269 */ 270 if (ret == -ENXIO) 271 display_failure_msg = 0; 272 goto out_device_destroy; 273 } 274 } 275 276 return sdev; 277 278 out_device_destroy: 279 transport_destroy_device(&sdev->sdev_gendev); 280 put_device(&sdev->sdev_gendev); 281 out: 282 if (display_failure_msg) 283 printk(ALLOC_FAILURE_MSG, __FUNCTION__); 284 return NULL; 285 } 286 287 static void scsi_target_dev_release(struct device *dev) 288 { 289 struct device *parent = dev->parent; 290 struct scsi_target *starget = to_scsi_target(dev); 291 292 kfree(starget); 293 put_device(parent); 294 } 295 296 int scsi_is_target_device(const struct device *dev) 297 { 298 return dev->release == scsi_target_dev_release; 299 } 300 EXPORT_SYMBOL(scsi_is_target_device); 301 302 static struct scsi_target *__scsi_find_target(struct device *parent, 303 int channel, uint id) 304 { 305 struct scsi_target *starget, *found_starget = NULL; 306 struct Scsi_Host *shost = dev_to_shost(parent); 307 /* 308 * Search for an existing target for this sdev. 309 */ 310 list_for_each_entry(starget, &shost->__targets, siblings) { 311 if (starget->id == id && 312 starget->channel == channel) { 313 found_starget = starget; 314 break; 315 } 316 } 317 if (found_starget) 318 get_device(&found_starget->dev); 319 320 return found_starget; 321 } 322 323 static struct scsi_target *scsi_alloc_target(struct device *parent, 324 int channel, uint id) 325 { 326 struct Scsi_Host *shost = dev_to_shost(parent); 327 struct device *dev = NULL; 328 unsigned long flags; 329 const int size = sizeof(struct scsi_target) 330 + shost->transportt->target_size; 331 struct scsi_target *starget; 332 struct scsi_target *found_target; 333 int error; 334 335 starget = kzalloc(size, GFP_KERNEL); 336 if (!starget) { 337 printk(KERN_ERR "%s: allocation failure\n", __FUNCTION__); 338 return NULL; 339 } 340 dev = &starget->dev; 341 device_initialize(dev); 342 starget->reap_ref = 1; 343 dev->parent = get_device(parent); 344 dev->release = scsi_target_dev_release; 345 sprintf(dev->bus_id, "target%d:%d:%d", 346 shost->host_no, channel, id); 347 starget->id = id; 348 starget->channel = channel; 349 INIT_LIST_HEAD(&starget->siblings); 350 INIT_LIST_HEAD(&starget->devices); 351 starget->state = STARGET_RUNNING; 352 retry: 353 spin_lock_irqsave(shost->host_lock, flags); 354 355 found_target = __scsi_find_target(parent, channel, id); 356 if (found_target) 357 goto found; 358 359 list_add_tail(&starget->siblings, &shost->__targets); 360 spin_unlock_irqrestore(shost->host_lock, flags); 361 /* allocate and add */ 362 transport_setup_device(dev); 363 error = device_add(dev); 364 if (error) { 365 dev_err(dev, "target device_add failed, error %d\n", error); 366 spin_lock_irqsave(shost->host_lock, flags); 367 list_del_init(&starget->siblings); 368 spin_unlock_irqrestore(shost->host_lock, flags); 369 transport_destroy_device(dev); 370 put_device(parent); 371 kfree(starget); 372 return NULL; 373 } 374 transport_add_device(dev); 375 if (shost->hostt->target_alloc) { 376 error = shost->hostt->target_alloc(starget); 377 378 if(error) { 379 dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error); 380 /* don't want scsi_target_reap to do the final 381 * put because it will be under the host lock */ 382 get_device(dev); 383 scsi_target_reap(starget); 384 put_device(dev); 385 return NULL; 386 } 387 } 388 389 return starget; 390 391 found: 392 found_target->reap_ref++; 393 spin_unlock_irqrestore(shost->host_lock, flags); 394 put_device(parent); 395 if (found_target->state != STARGET_DEL) { 396 kfree(starget); 397 return found_target; 398 } 399 /* Unfortunately, we found a dying target; need to 400 * wait until it's dead before we can get a new one */ 401 put_device(&found_target->dev); 402 flush_scheduled_work(); 403 goto retry; 404 } 405 406 static void scsi_target_reap_usercontext(void *data) 407 { 408 struct scsi_target *starget = data; 409 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 410 unsigned long flags; 411 412 transport_remove_device(&starget->dev); 413 device_del(&starget->dev); 414 transport_destroy_device(&starget->dev); 415 spin_lock_irqsave(shost->host_lock, flags); 416 if (shost->hostt->target_destroy) 417 shost->hostt->target_destroy(starget); 418 list_del_init(&starget->siblings); 419 spin_unlock_irqrestore(shost->host_lock, flags); 420 put_device(&starget->dev); 421 } 422 423 /** 424 * scsi_target_reap - check to see if target is in use and destroy if not 425 * 426 * @starget: target to be checked 427 * 428 * This is used after removing a LUN or doing a last put of the target 429 * it checks atomically that nothing is using the target and removes 430 * it if so. 431 */ 432 void scsi_target_reap(struct scsi_target *starget) 433 { 434 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 435 unsigned long flags; 436 437 spin_lock_irqsave(shost->host_lock, flags); 438 439 if (--starget->reap_ref == 0 && list_empty(&starget->devices)) { 440 BUG_ON(starget->state == STARGET_DEL); 441 starget->state = STARGET_DEL; 442 spin_unlock_irqrestore(shost->host_lock, flags); 443 execute_in_process_context(scsi_target_reap_usercontext, 444 starget, &starget->ew); 445 return; 446 447 } 448 spin_unlock_irqrestore(shost->host_lock, flags); 449 450 return; 451 } 452 453 /** 454 * scsi_probe_lun - probe a single LUN using a SCSI INQUIRY 455 * @sdev: scsi_device to probe 456 * @inq_result: area to store the INQUIRY result 457 * @result_len: len of inq_result 458 * @bflags: store any bflags found here 459 * 460 * Description: 461 * Probe the lun associated with @req using a standard SCSI INQUIRY; 462 * 463 * If the INQUIRY is successful, zero is returned and the 464 * INQUIRY data is in @inq_result; the scsi_level and INQUIRY length 465 * are copied to the scsi_device any flags value is stored in *@bflags. 466 **/ 467 static int scsi_probe_lun(struct scsi_device *sdev, char *inq_result, 468 int result_len, int *bflags) 469 { 470 unsigned char scsi_cmd[MAX_COMMAND_SIZE]; 471 int first_inquiry_len, try_inquiry_len, next_inquiry_len; 472 int response_len = 0; 473 int pass, count, result; 474 struct scsi_sense_hdr sshdr; 475 476 *bflags = 0; 477 478 /* Perform up to 3 passes. The first pass uses a conservative 479 * transfer length of 36 unless sdev->inquiry_len specifies a 480 * different value. */ 481 first_inquiry_len = sdev->inquiry_len ? sdev->inquiry_len : 36; 482 try_inquiry_len = first_inquiry_len; 483 pass = 1; 484 485 next_pass: 486 SCSI_LOG_SCAN_BUS(3, sdev_printk(KERN_INFO, sdev, 487 "scsi scan: INQUIRY pass %d length %d\n", 488 pass, try_inquiry_len)); 489 490 /* Each pass gets up to three chances to ignore Unit Attention */ 491 for (count = 0; count < 3; ++count) { 492 memset(scsi_cmd, 0, 6); 493 scsi_cmd[0] = INQUIRY; 494 scsi_cmd[4] = (unsigned char) try_inquiry_len; 495 496 memset(inq_result, 0, try_inquiry_len); 497 498 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, 499 inq_result, try_inquiry_len, &sshdr, 500 HZ / 2 + HZ * scsi_inq_timeout, 3); 501 502 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: INQUIRY %s " 503 "with code 0x%x\n", 504 result ? "failed" : "successful", result)); 505 506 if (result) { 507 /* 508 * not-ready to ready transition [asc/ascq=0x28/0x0] 509 * or power-on, reset [asc/ascq=0x29/0x0], continue. 510 * INQUIRY should not yield UNIT_ATTENTION 511 * but many buggy devices do so anyway. 512 */ 513 if ((driver_byte(result) & DRIVER_SENSE) && 514 scsi_sense_valid(&sshdr)) { 515 if ((sshdr.sense_key == UNIT_ATTENTION) && 516 ((sshdr.asc == 0x28) || 517 (sshdr.asc == 0x29)) && 518 (sshdr.ascq == 0)) 519 continue; 520 } 521 } 522 break; 523 } 524 525 if (result == 0) { 526 response_len = (unsigned char) inq_result[4] + 5; 527 if (response_len > 255) 528 response_len = first_inquiry_len; /* sanity */ 529 530 /* 531 * Get any flags for this device. 532 * 533 * XXX add a bflags to scsi_device, and replace the 534 * corresponding bit fields in scsi_device, so bflags 535 * need not be passed as an argument. 536 */ 537 *bflags = scsi_get_device_flags(sdev, &inq_result[8], 538 &inq_result[16]); 539 540 /* When the first pass succeeds we gain information about 541 * what larger transfer lengths might work. */ 542 if (pass == 1) { 543 if (BLIST_INQUIRY_36 & *bflags) 544 next_inquiry_len = 36; 545 else if (BLIST_INQUIRY_58 & *bflags) 546 next_inquiry_len = 58; 547 else if (sdev->inquiry_len) 548 next_inquiry_len = sdev->inquiry_len; 549 else 550 next_inquiry_len = response_len; 551 552 /* If more data is available perform the second pass */ 553 if (next_inquiry_len > try_inquiry_len) { 554 try_inquiry_len = next_inquiry_len; 555 pass = 2; 556 goto next_pass; 557 } 558 } 559 560 } else if (pass == 2) { 561 printk(KERN_INFO "scsi scan: %d byte inquiry failed. " 562 "Consider BLIST_INQUIRY_36 for this device\n", 563 try_inquiry_len); 564 565 /* If this pass failed, the third pass goes back and transfers 566 * the same amount as we successfully got in the first pass. */ 567 try_inquiry_len = first_inquiry_len; 568 pass = 3; 569 goto next_pass; 570 } 571 572 /* If the last transfer attempt got an error, assume the 573 * peripheral doesn't exist or is dead. */ 574 if (result) 575 return -EIO; 576 577 /* Don't report any more data than the device says is valid */ 578 sdev->inquiry_len = min(try_inquiry_len, response_len); 579 580 /* 581 * XXX Abort if the response length is less than 36? If less than 582 * 32, the lookup of the device flags (above) could be invalid, 583 * and it would be possible to take an incorrect action - we do 584 * not want to hang because of a short INQUIRY. On the flip side, 585 * if the device is spun down or becoming ready (and so it gives a 586 * short INQUIRY), an abort here prevents any further use of the 587 * device, including spin up. 588 * 589 * Related to the above issue: 590 * 591 * XXX Devices (disk or all?) should be sent a TEST UNIT READY, 592 * and if not ready, sent a START_STOP to start (maybe spin up) and 593 * then send the INQUIRY again, since the INQUIRY can change after 594 * a device is initialized. 595 * 596 * Ideally, start a device if explicitly asked to do so. This 597 * assumes that a device is spun up on power on, spun down on 598 * request, and then spun up on request. 599 */ 600 601 /* 602 * The scanning code needs to know the scsi_level, even if no 603 * device is attached at LUN 0 (SCSI_SCAN_TARGET_PRESENT) so 604 * non-zero LUNs can be scanned. 605 */ 606 sdev->scsi_level = inq_result[2] & 0x07; 607 if (sdev->scsi_level >= 2 || 608 (sdev->scsi_level == 1 && (inq_result[3] & 0x0f) == 1)) 609 sdev->scsi_level++; 610 sdev->sdev_target->scsi_level = sdev->scsi_level; 611 612 return 0; 613 } 614 615 /** 616 * scsi_add_lun - allocate and fully initialze a scsi_device 617 * @sdevscan: holds information to be stored in the new scsi_device 618 * @sdevnew: store the address of the newly allocated scsi_device 619 * @inq_result: holds the result of a previous INQUIRY to the LUN 620 * @bflags: black/white list flag 621 * 622 * Description: 623 * Allocate and initialize a scsi_device matching sdevscan. Optionally 624 * set fields based on values in *@bflags. If @sdevnew is not 625 * NULL, store the address of the new scsi_device in *@sdevnew (needed 626 * when scanning a particular LUN). 627 * 628 * Return: 629 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device 630 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized 631 **/ 632 static int scsi_add_lun(struct scsi_device *sdev, char *inq_result, int *bflags) 633 { 634 /* 635 * XXX do not save the inquiry, since it can change underneath us, 636 * save just vendor/model/rev. 637 * 638 * Rather than save it and have an ioctl that retrieves the saved 639 * value, have an ioctl that executes the same INQUIRY code used 640 * in scsi_probe_lun, let user level programs doing INQUIRY 641 * scanning run at their own risk, or supply a user level program 642 * that can correctly scan. 643 */ 644 sdev->inquiry = kmalloc(sdev->inquiry_len, GFP_ATOMIC); 645 if (sdev->inquiry == NULL) { 646 return SCSI_SCAN_NO_RESPONSE; 647 } 648 649 memcpy(sdev->inquiry, inq_result, sdev->inquiry_len); 650 sdev->vendor = (char *) (sdev->inquiry + 8); 651 sdev->model = (char *) (sdev->inquiry + 16); 652 sdev->rev = (char *) (sdev->inquiry + 32); 653 654 if (*bflags & BLIST_ISROM) { 655 /* 656 * It would be better to modify sdev->type, and set 657 * sdev->removable, but then the print_inquiry() output 658 * would not show TYPE_ROM; if print_inquiry() is removed 659 * the issue goes away. 660 */ 661 inq_result[0] = TYPE_ROM; 662 inq_result[1] |= 0x80; /* removable */ 663 } else if (*bflags & BLIST_NO_ULD_ATTACH) 664 sdev->no_uld_attach = 1; 665 666 switch (sdev->type = (inq_result[0] & 0x1f)) { 667 case TYPE_TAPE: 668 case TYPE_DISK: 669 case TYPE_PRINTER: 670 case TYPE_MOD: 671 case TYPE_PROCESSOR: 672 case TYPE_SCANNER: 673 case TYPE_MEDIUM_CHANGER: 674 case TYPE_ENCLOSURE: 675 case TYPE_COMM: 676 case TYPE_RBC: 677 sdev->writeable = 1; 678 break; 679 case TYPE_WORM: 680 case TYPE_ROM: 681 sdev->writeable = 0; 682 break; 683 default: 684 printk(KERN_INFO "scsi: unknown device type %d\n", sdev->type); 685 } 686 687 print_inquiry(inq_result); 688 689 /* 690 * For a peripheral qualifier (PQ) value of 1 (001b), the SCSI 691 * spec says: The device server is capable of supporting the 692 * specified peripheral device type on this logical unit. However, 693 * the physical device is not currently connected to this logical 694 * unit. 695 * 696 * The above is vague, as it implies that we could treat 001 and 697 * 011 the same. Stay compatible with previous code, and create a 698 * scsi_device for a PQ of 1 699 * 700 * Don't set the device offline here; rather let the upper 701 * level drivers eval the PQ to decide whether they should 702 * attach. So remove ((inq_result[0] >> 5) & 7) == 1 check. 703 */ 704 705 sdev->inq_periph_qual = (inq_result[0] >> 5) & 7; 706 sdev->removable = (0x80 & inq_result[1]) >> 7; 707 sdev->lockable = sdev->removable; 708 sdev->soft_reset = (inq_result[7] & 1) && ((inq_result[3] & 7) == 2); 709 710 if (sdev->scsi_level >= SCSI_3 || (sdev->inquiry_len > 56 && 711 inq_result[56] & 0x04)) 712 sdev->ppr = 1; 713 if (inq_result[7] & 0x60) 714 sdev->wdtr = 1; 715 if (inq_result[7] & 0x10) 716 sdev->sdtr = 1; 717 718 /* 719 * End sysfs code. 720 */ 721 722 if ((sdev->scsi_level >= SCSI_2) && (inq_result[7] & 2) && 723 !(*bflags & BLIST_NOTQ)) 724 sdev->tagged_supported = 1; 725 /* 726 * Some devices (Texel CD ROM drives) have handshaking problems 727 * when used with the Seagate controllers. borken is initialized 728 * to 1, and then set it to 0 here. 729 */ 730 if ((*bflags & BLIST_BORKEN) == 0) 731 sdev->borken = 0; 732 733 /* 734 * Apparently some really broken devices (contrary to the SCSI 735 * standards) need to be selected without asserting ATN 736 */ 737 if (*bflags & BLIST_SELECT_NO_ATN) 738 sdev->select_no_atn = 1; 739 740 /* 741 * Some devices may not want to have a start command automatically 742 * issued when a device is added. 743 */ 744 if (*bflags & BLIST_NOSTARTONADD) 745 sdev->no_start_on_add = 1; 746 747 if (*bflags & BLIST_SINGLELUN) 748 sdev->single_lun = 1; 749 750 751 sdev->use_10_for_rw = 1; 752 753 if (*bflags & BLIST_MS_SKIP_PAGE_08) 754 sdev->skip_ms_page_8 = 1; 755 756 if (*bflags & BLIST_MS_SKIP_PAGE_3F) 757 sdev->skip_ms_page_3f = 1; 758 759 if (*bflags & BLIST_USE_10_BYTE_MS) 760 sdev->use_10_for_ms = 1; 761 762 /* set the device running here so that slave configure 763 * may do I/O */ 764 scsi_device_set_state(sdev, SDEV_RUNNING); 765 766 if (*bflags & BLIST_MS_192_BYTES_FOR_3F) 767 sdev->use_192_bytes_for_3f = 1; 768 769 if (*bflags & BLIST_NOT_LOCKABLE) 770 sdev->lockable = 0; 771 772 if (*bflags & BLIST_RETRY_HWERROR) 773 sdev->retry_hwerror = 1; 774 775 transport_configure_device(&sdev->sdev_gendev); 776 777 if (sdev->host->hostt->slave_configure) { 778 int ret = sdev->host->hostt->slave_configure(sdev); 779 if (ret) { 780 /* 781 * if LLDD reports slave not present, don't clutter 782 * console with alloc failure messages 783 */ 784 if (ret != -ENXIO) { 785 sdev_printk(KERN_ERR, sdev, 786 "failed to configure device\n"); 787 } 788 return SCSI_SCAN_NO_RESPONSE; 789 } 790 } 791 792 /* 793 * Ok, the device is now all set up, we can 794 * register it and tell the rest of the kernel 795 * about it. 796 */ 797 if (scsi_sysfs_add_sdev(sdev) != 0) 798 return SCSI_SCAN_NO_RESPONSE; 799 800 return SCSI_SCAN_LUN_PRESENT; 801 } 802 803 static inline void scsi_destroy_sdev(struct scsi_device *sdev) 804 { 805 if (sdev->host->hostt->slave_destroy) 806 sdev->host->hostt->slave_destroy(sdev); 807 transport_destroy_device(&sdev->sdev_gendev); 808 put_device(&sdev->sdev_gendev); 809 } 810 811 812 /** 813 * scsi_probe_and_add_lun - probe a LUN, if a LUN is found add it 814 * @starget: pointer to target device structure 815 * @lun: LUN of target device 816 * @sdevscan: probe the LUN corresponding to this scsi_device 817 * @sdevnew: store the value of any new scsi_device allocated 818 * @bflagsp: store bflags here if not NULL 819 * 820 * Description: 821 * Call scsi_probe_lun, if a LUN with an attached device is found, 822 * allocate and set it up by calling scsi_add_lun. 823 * 824 * Return: 825 * SCSI_SCAN_NO_RESPONSE: could not allocate or setup a scsi_device 826 * SCSI_SCAN_TARGET_PRESENT: target responded, but no device is 827 * attached at the LUN 828 * SCSI_SCAN_LUN_PRESENT: a new scsi_device was allocated and initialized 829 **/ 830 static int scsi_probe_and_add_lun(struct scsi_target *starget, 831 uint lun, int *bflagsp, 832 struct scsi_device **sdevp, int rescan, 833 void *hostdata) 834 { 835 struct scsi_device *sdev; 836 unsigned char *result; 837 int bflags, res = SCSI_SCAN_NO_RESPONSE, result_len = 256; 838 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 839 840 /* 841 * The rescan flag is used as an optimization, the first scan of a 842 * host adapter calls into here with rescan == 0. 843 */ 844 sdev = scsi_device_lookup_by_target(starget, lun); 845 if (sdev) { 846 if (rescan || sdev->sdev_state != SDEV_CREATED) { 847 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO 848 "scsi scan: device exists on %s\n", 849 sdev->sdev_gendev.bus_id)); 850 if (sdevp) 851 *sdevp = sdev; 852 else 853 scsi_device_put(sdev); 854 855 if (bflagsp) 856 *bflagsp = scsi_get_device_flags(sdev, 857 sdev->vendor, 858 sdev->model); 859 return SCSI_SCAN_LUN_PRESENT; 860 } 861 scsi_device_put(sdev); 862 } else 863 sdev = scsi_alloc_sdev(starget, lun, hostdata); 864 if (!sdev) 865 goto out; 866 867 result = kmalloc(result_len, GFP_ATOMIC | 868 ((shost->unchecked_isa_dma) ? __GFP_DMA : 0)); 869 if (!result) 870 goto out_free_sdev; 871 872 if (scsi_probe_lun(sdev, result, result_len, &bflags)) 873 goto out_free_result; 874 875 /* 876 * result contains valid SCSI INQUIRY data. 877 */ 878 if ((result[0] >> 5) == 3) { 879 /* 880 * For a Peripheral qualifier 3 (011b), the SCSI 881 * spec says: The device server is not capable of 882 * supporting a physical device on this logical 883 * unit. 884 * 885 * For disks, this implies that there is no 886 * logical disk configured at sdev->lun, but there 887 * is a target id responding. 888 */ 889 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO 890 "scsi scan: peripheral qualifier of 3," 891 " no device added\n")); 892 res = SCSI_SCAN_TARGET_PRESENT; 893 goto out_free_result; 894 } 895 896 /* 897 * Non-standard SCSI targets may set the PDT to 0x1f (unknown or 898 * no device type) instead of using the Peripheral Qualifier to 899 * indicate that no LUN is present. For example, USB UFI does this. 900 */ 901 if (starget->pdt_1f_for_no_lun && (result[0] & 0x1f) == 0x1f) { 902 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO 903 "scsi scan: peripheral device type" 904 " of 31, no device added\n")); 905 res = SCSI_SCAN_TARGET_PRESENT; 906 goto out_free_result; 907 } 908 909 res = scsi_add_lun(sdev, result, &bflags); 910 if (res == SCSI_SCAN_LUN_PRESENT) { 911 if (bflags & BLIST_KEY) { 912 sdev->lockable = 0; 913 scsi_unlock_floptical(sdev, result); 914 } 915 if (bflagsp) 916 *bflagsp = bflags; 917 } 918 919 out_free_result: 920 kfree(result); 921 out_free_sdev: 922 if (res == SCSI_SCAN_LUN_PRESENT) { 923 if (sdevp) { 924 if (scsi_device_get(sdev) == 0) { 925 *sdevp = sdev; 926 } else { 927 __scsi_remove_device(sdev); 928 res = SCSI_SCAN_NO_RESPONSE; 929 } 930 } 931 } else 932 scsi_destroy_sdev(sdev); 933 out: 934 return res; 935 } 936 937 /** 938 * scsi_sequential_lun_scan - sequentially scan a SCSI target 939 * @starget: pointer to target structure to scan 940 * @bflags: black/white list flag for LUN 0 941 * @lun0_res: result of scanning LUN 0 942 * 943 * Description: 944 * Generally, scan from LUN 1 (LUN 0 is assumed to already have been 945 * scanned) to some maximum lun until a LUN is found with no device 946 * attached. Use the bflags to figure out any oddities. 947 * 948 * Modifies sdevscan->lun. 949 **/ 950 static void scsi_sequential_lun_scan(struct scsi_target *starget, 951 int bflags, int lun0_res, int scsi_level, 952 int rescan) 953 { 954 unsigned int sparse_lun, lun, max_dev_lun; 955 struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); 956 957 SCSI_LOG_SCAN_BUS(3, printk(KERN_INFO "scsi scan: Sequential scan of" 958 "%s\n", starget->dev.bus_id)); 959 960 max_dev_lun = min(max_scsi_luns, shost->max_lun); 961 /* 962 * If this device is known to support sparse multiple units, 963 * override the other settings, and scan all of them. Normally, 964 * SCSI-3 devices should be scanned via the REPORT LUNS. 965 */ 966 if (bflags & BLIST_SPARSELUN) { 967 max_dev_lun = shost->max_lun; 968 sparse_lun = 1; 969 } else 970 sparse_lun = 0; 971 972 /* 973 * If not sparse lun and no device attached at LUN 0 do not scan 974 * any further. 975 */ 976 if (!sparse_lun && (lun0_res != SCSI_SCAN_LUN_PRESENT)) 977 return; 978 979 /* 980 * If less than SCSI_1_CSS, and no special lun scaning, stop 981 * scanning; this matches 2.4 behaviour, but could just be a bug 982 * (to continue scanning a SCSI_1_CSS device). 983 * 984 * This test is broken. We might not have any device on lun0 for 985 * a sparselun device, and if that's the case then how would we 986 * know the real scsi_level, eh? It might make sense to just not 987 * scan any SCSI_1 device for non-0 luns, but that check would best 988 * go into scsi_alloc_sdev() and just have it return null when asked 989 * to alloc an sdev for lun > 0 on an already found SCSI_1 device. 990 * 991 if ((sdevscan->scsi_level < SCSI_1_CCS) && 992 ((bflags & (BLIST_FORCELUN | BLIST_SPARSELUN | BLIST_MAX5LUN)) 993 == 0)) 994 return; 995 */ 996 /* 997 * If this device is known to support multiple units, override 998 * the other settings, and scan all of them. 999 */ 1000 if (bflags & BLIST_FORCELUN) 1001 max_dev_lun = shost->max_lun; 1002 /* 1003 * REGAL CDC-4X: avoid hang after LUN 4 1004 */ 1005 if (bflags & BLIST_MAX5LUN) 1006 max_dev_lun = min(5U, max_dev_lun); 1007 /* 1008 * Do not scan SCSI-2 or lower device past LUN 7, unless 1009 * BLIST_LARGELUN. 1010 */ 1011 if (scsi_level < SCSI_3 && !(bflags & BLIST_LARGELUN)) 1012 max_dev_lun = min(8U, max_dev_lun); 1013 1014 /* 1015 * We have already scanned LUN 0, so start at LUN 1. Keep scanning 1016 * until we reach the max, or no LUN is found and we are not 1017 * sparse_lun. 1018 */ 1019 for (lun = 1; lun < max_dev_lun; ++lun) 1020 if ((scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, 1021 NULL) != SCSI_SCAN_LUN_PRESENT) && 1022 !sparse_lun) 1023 return; 1024 } 1025 1026 /** 1027 * scsilun_to_int: convert a scsi_lun to an int 1028 * @scsilun: struct scsi_lun to be converted. 1029 * 1030 * Description: 1031 * Convert @scsilun from a struct scsi_lun to a four byte host byte-ordered 1032 * integer, and return the result. The caller must check for 1033 * truncation before using this function. 1034 * 1035 * Notes: 1036 * The struct scsi_lun is assumed to be four levels, with each level 1037 * effectively containing a SCSI byte-ordered (big endian) short; the 1038 * addressing bits of each level are ignored (the highest two bits). 1039 * For a description of the LUN format, post SCSI-3 see the SCSI 1040 * Architecture Model, for SCSI-3 see the SCSI Controller Commands. 1041 * 1042 * Given a struct scsi_lun of: 0a 04 0b 03 00 00 00 00, this function returns 1043 * the integer: 0x0b030a04 1044 **/ 1045 static int scsilun_to_int(struct scsi_lun *scsilun) 1046 { 1047 int i; 1048 unsigned int lun; 1049 1050 lun = 0; 1051 for (i = 0; i < sizeof(lun); i += 2) 1052 lun = lun | (((scsilun->scsi_lun[i] << 8) | 1053 scsilun->scsi_lun[i + 1]) << (i * 8)); 1054 return lun; 1055 } 1056 1057 /** 1058 * int_to_scsilun: reverts an int into a scsi_lun 1059 * @int: integer to be reverted 1060 * @scsilun: struct scsi_lun to be set. 1061 * 1062 * Description: 1063 * Reverts the functionality of the scsilun_to_int, which packed 1064 * an 8-byte lun value into an int. This routine unpacks the int 1065 * back into the lun value. 1066 * Note: the scsilun_to_int() routine does not truly handle all 1067 * 8bytes of the lun value. This functions restores only as much 1068 * as was set by the routine. 1069 * 1070 * Notes: 1071 * Given an integer : 0x0b030a04, this function returns a 1072 * scsi_lun of : struct scsi_lun of: 0a 04 0b 03 00 00 00 00 1073 * 1074 **/ 1075 void int_to_scsilun(unsigned int lun, struct scsi_lun *scsilun) 1076 { 1077 int i; 1078 1079 memset(scsilun->scsi_lun, 0, sizeof(scsilun->scsi_lun)); 1080 1081 for (i = 0; i < sizeof(lun); i += 2) { 1082 scsilun->scsi_lun[i] = (lun >> 8) & 0xFF; 1083 scsilun->scsi_lun[i+1] = lun & 0xFF; 1084 lun = lun >> 16; 1085 } 1086 } 1087 EXPORT_SYMBOL(int_to_scsilun); 1088 1089 /** 1090 * scsi_report_lun_scan - Scan using SCSI REPORT LUN results 1091 * @sdevscan: scan the host, channel, and id of this scsi_device 1092 * 1093 * Description: 1094 * If @sdevscan is for a SCSI-3 or up device, send a REPORT LUN 1095 * command, and scan the resulting list of LUNs by calling 1096 * scsi_probe_and_add_lun. 1097 * 1098 * Modifies sdevscan->lun. 1099 * 1100 * Return: 1101 * 0: scan completed (or no memory, so further scanning is futile) 1102 * 1: no report lun scan, or not configured 1103 **/ 1104 static int scsi_report_lun_scan(struct scsi_target *starget, int bflags, 1105 int rescan) 1106 { 1107 char devname[64]; 1108 unsigned char scsi_cmd[MAX_COMMAND_SIZE]; 1109 unsigned int length; 1110 unsigned int lun; 1111 unsigned int num_luns; 1112 unsigned int retries; 1113 int result; 1114 struct scsi_lun *lunp, *lun_data; 1115 u8 *data; 1116 struct scsi_sense_hdr sshdr; 1117 struct scsi_device *sdev; 1118 struct Scsi_Host *shost = dev_to_shost(&starget->dev); 1119 int ret = 0; 1120 1121 /* 1122 * Only support SCSI-3 and up devices if BLIST_NOREPORTLUN is not set. 1123 * Also allow SCSI-2 if BLIST_REPORTLUN2 is set and host adapter does 1124 * support more than 8 LUNs. 1125 */ 1126 if ((bflags & BLIST_NOREPORTLUN) || 1127 starget->scsi_level < SCSI_2 || 1128 (starget->scsi_level < SCSI_3 && 1129 (!(bflags & BLIST_REPORTLUN2) || shost->max_lun <= 8)) ) 1130 return 1; 1131 if (bflags & BLIST_NOLUN) 1132 return 0; 1133 1134 if (!(sdev = scsi_device_lookup_by_target(starget, 0))) { 1135 sdev = scsi_alloc_sdev(starget, 0, NULL); 1136 if (!sdev) 1137 return 0; 1138 if (scsi_device_get(sdev)) 1139 return 0; 1140 } 1141 1142 sprintf(devname, "host %d channel %d id %d", 1143 shost->host_no, sdev->channel, sdev->id); 1144 1145 /* 1146 * Allocate enough to hold the header (the same size as one scsi_lun) 1147 * plus the max number of luns we are requesting. 1148 * 1149 * Reallocating and trying again (with the exact amount we need) 1150 * would be nice, but then we need to somehow limit the size 1151 * allocated based on the available memory and the limits of 1152 * kmalloc - we don't want a kmalloc() failure of a huge value to 1153 * prevent us from finding any LUNs on this target. 1154 */ 1155 length = (max_scsi_report_luns + 1) * sizeof(struct scsi_lun); 1156 lun_data = kmalloc(length, GFP_ATOMIC | 1157 (sdev->host->unchecked_isa_dma ? __GFP_DMA : 0)); 1158 if (!lun_data) { 1159 printk(ALLOC_FAILURE_MSG, __FUNCTION__); 1160 goto out; 1161 } 1162 1163 scsi_cmd[0] = REPORT_LUNS; 1164 1165 /* 1166 * bytes 1 - 5: reserved, set to zero. 1167 */ 1168 memset(&scsi_cmd[1], 0, 5); 1169 1170 /* 1171 * bytes 6 - 9: length of the command. 1172 */ 1173 scsi_cmd[6] = (unsigned char) (length >> 24) & 0xff; 1174 scsi_cmd[7] = (unsigned char) (length >> 16) & 0xff; 1175 scsi_cmd[8] = (unsigned char) (length >> 8) & 0xff; 1176 scsi_cmd[9] = (unsigned char) length & 0xff; 1177 1178 scsi_cmd[10] = 0; /* reserved */ 1179 scsi_cmd[11] = 0; /* control */ 1180 1181 /* 1182 * We can get a UNIT ATTENTION, for example a power on/reset, so 1183 * retry a few times (like sd.c does for TEST UNIT READY). 1184 * Experience shows some combinations of adapter/devices get at 1185 * least two power on/resets. 1186 * 1187 * Illegal requests (for devices that do not support REPORT LUNS) 1188 * should come through as a check condition, and will not generate 1189 * a retry. 1190 */ 1191 for (retries = 0; retries < 3; retries++) { 1192 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: Sending" 1193 " REPORT LUNS to %s (try %d)\n", devname, 1194 retries)); 1195 1196 result = scsi_execute_req(sdev, scsi_cmd, DMA_FROM_DEVICE, 1197 lun_data, length, &sshdr, 1198 SCSI_TIMEOUT + 4 * HZ, 3); 1199 1200 SCSI_LOG_SCAN_BUS(3, printk (KERN_INFO "scsi scan: REPORT LUNS" 1201 " %s (try %d) result 0x%x\n", result 1202 ? "failed" : "successful", retries, result)); 1203 if (result == 0) 1204 break; 1205 else if (scsi_sense_valid(&sshdr)) { 1206 if (sshdr.sense_key != UNIT_ATTENTION) 1207 break; 1208 } 1209 } 1210 1211 if (result) { 1212 /* 1213 * The device probably does not support a REPORT LUN command 1214 */ 1215 ret = 1; 1216 goto out_err; 1217 } 1218 1219 /* 1220 * Get the length from the first four bytes of lun_data. 1221 */ 1222 data = (u8 *) lun_data->scsi_lun; 1223 length = ((data[0] << 24) | (data[1] << 16) | 1224 (data[2] << 8) | (data[3] << 0)); 1225 1226 num_luns = (length / sizeof(struct scsi_lun)); 1227 if (num_luns > max_scsi_report_luns) { 1228 printk(KERN_WARNING "scsi: On %s only %d (max_scsi_report_luns)" 1229 " of %d luns reported, try increasing" 1230 " max_scsi_report_luns.\n", devname, 1231 max_scsi_report_luns, num_luns); 1232 num_luns = max_scsi_report_luns; 1233 } 1234 1235 SCSI_LOG_SCAN_BUS(3, sdev_printk (KERN_INFO, sdev, 1236 "scsi scan: REPORT LUN scan\n")); 1237 1238 /* 1239 * Scan the luns in lun_data. The entry at offset 0 is really 1240 * the header, so start at 1 and go up to and including num_luns. 1241 */ 1242 for (lunp = &lun_data[1]; lunp <= &lun_data[num_luns]; lunp++) { 1243 lun = scsilun_to_int(lunp); 1244 1245 /* 1246 * Check if the unused part of lunp is non-zero, and so 1247 * does not fit in lun. 1248 */ 1249 if (memcmp(&lunp->scsi_lun[sizeof(lun)], "\0\0\0\0", 4)) { 1250 int i; 1251 1252 /* 1253 * Output an error displaying the LUN in byte order, 1254 * this differs from what linux would print for the 1255 * integer LUN value. 1256 */ 1257 printk(KERN_WARNING "scsi: %s lun 0x", devname); 1258 data = (char *)lunp->scsi_lun; 1259 for (i = 0; i < sizeof(struct scsi_lun); i++) 1260 printk("%02x", data[i]); 1261 printk(" has a LUN larger than currently supported.\n"); 1262 } else if (lun > sdev->host->max_lun) { 1263 printk(KERN_WARNING "scsi: %s lun%d has a LUN larger" 1264 " than allowed by the host adapter\n", 1265 devname, lun); 1266 } else { 1267 int res; 1268 1269 res = scsi_probe_and_add_lun(starget, 1270 lun, NULL, NULL, rescan, NULL); 1271 if (res == SCSI_SCAN_NO_RESPONSE) { 1272 /* 1273 * Got some results, but now none, abort. 1274 */ 1275 sdev_printk(KERN_ERR, sdev, 1276 "Unexpected response" 1277 " from lun %d while scanning, scan" 1278 " aborted\n", lun); 1279 break; 1280 } 1281 } 1282 } 1283 1284 out_err: 1285 kfree(lun_data); 1286 out: 1287 scsi_device_put(sdev); 1288 if (sdev->sdev_state == SDEV_CREATED) 1289 /* 1290 * the sdev we used didn't appear in the report luns scan 1291 */ 1292 scsi_destroy_sdev(sdev); 1293 return ret; 1294 } 1295 1296 struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel, 1297 uint id, uint lun, void *hostdata) 1298 { 1299 struct scsi_device *sdev = ERR_PTR(-ENODEV); 1300 struct device *parent = &shost->shost_gendev; 1301 struct scsi_target *starget; 1302 1303 starget = scsi_alloc_target(parent, channel, id); 1304 if (!starget) 1305 return ERR_PTR(-ENOMEM); 1306 1307 get_device(&starget->dev); 1308 mutex_lock(&shost->scan_mutex); 1309 if (scsi_host_scan_allowed(shost)) 1310 scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata); 1311 mutex_unlock(&shost->scan_mutex); 1312 scsi_target_reap(starget); 1313 put_device(&starget->dev); 1314 1315 return sdev; 1316 } 1317 EXPORT_SYMBOL(__scsi_add_device); 1318 1319 int scsi_add_device(struct Scsi_Host *host, uint channel, 1320 uint target, uint lun) 1321 { 1322 struct scsi_device *sdev = 1323 __scsi_add_device(host, channel, target, lun, NULL); 1324 if (IS_ERR(sdev)) 1325 return PTR_ERR(sdev); 1326 1327 scsi_device_put(sdev); 1328 return 0; 1329 } 1330 EXPORT_SYMBOL(scsi_add_device); 1331 1332 void scsi_rescan_device(struct device *dev) 1333 { 1334 struct scsi_driver *drv; 1335 1336 if (!dev->driver) 1337 return; 1338 1339 drv = to_scsi_driver(dev->driver); 1340 if (try_module_get(drv->owner)) { 1341 if (drv->rescan) 1342 drv->rescan(dev); 1343 module_put(drv->owner); 1344 } 1345 } 1346 EXPORT_SYMBOL(scsi_rescan_device); 1347 1348 static void __scsi_scan_target(struct device *parent, unsigned int channel, 1349 unsigned int id, unsigned int lun, int rescan) 1350 { 1351 struct Scsi_Host *shost = dev_to_shost(parent); 1352 int bflags = 0; 1353 int res; 1354 struct scsi_target *starget; 1355 1356 if (shost->this_id == id) 1357 /* 1358 * Don't scan the host adapter 1359 */ 1360 return; 1361 1362 starget = scsi_alloc_target(parent, channel, id); 1363 if (!starget) 1364 return; 1365 1366 get_device(&starget->dev); 1367 if (lun != SCAN_WILD_CARD) { 1368 /* 1369 * Scan for a specific host/chan/id/lun. 1370 */ 1371 scsi_probe_and_add_lun(starget, lun, NULL, NULL, rescan, NULL); 1372 goto out_reap; 1373 } 1374 1375 /* 1376 * Scan LUN 0, if there is some response, scan further. Ideally, we 1377 * would not configure LUN 0 until all LUNs are scanned. 1378 */ 1379 res = scsi_probe_and_add_lun(starget, 0, &bflags, NULL, rescan, NULL); 1380 if (res == SCSI_SCAN_LUN_PRESENT || res == SCSI_SCAN_TARGET_PRESENT) { 1381 if (scsi_report_lun_scan(starget, bflags, rescan) != 0) 1382 /* 1383 * The REPORT LUN did not scan the target, 1384 * do a sequential scan. 1385 */ 1386 scsi_sequential_lun_scan(starget, bflags, 1387 res, starget->scsi_level, rescan); 1388 } 1389 1390 out_reap: 1391 /* now determine if the target has any children at all 1392 * and if not, nuke it */ 1393 scsi_target_reap(starget); 1394 1395 put_device(&starget->dev); 1396 } 1397 1398 /** 1399 * scsi_scan_target - scan a target id, possibly including all LUNs on the 1400 * target. 1401 * @parent: host to scan 1402 * @channel: channel to scan 1403 * @id: target id to scan 1404 * @lun: Specific LUN to scan or SCAN_WILD_CARD 1405 * @rescan: passed to LUN scanning routines 1406 * 1407 * Description: 1408 * Scan the target id on @parent, @channel, and @id. Scan at least LUN 0, 1409 * and possibly all LUNs on the target id. 1410 * 1411 * First try a REPORT LUN scan, if that does not scan the target, do a 1412 * sequential scan of LUNs on the target id. 1413 **/ 1414 void scsi_scan_target(struct device *parent, unsigned int channel, 1415 unsigned int id, unsigned int lun, int rescan) 1416 { 1417 struct Scsi_Host *shost = dev_to_shost(parent); 1418 1419 mutex_lock(&shost->scan_mutex); 1420 if (scsi_host_scan_allowed(shost)) 1421 __scsi_scan_target(parent, channel, id, lun, rescan); 1422 mutex_unlock(&shost->scan_mutex); 1423 } 1424 EXPORT_SYMBOL(scsi_scan_target); 1425 1426 static void scsi_scan_channel(struct Scsi_Host *shost, unsigned int channel, 1427 unsigned int id, unsigned int lun, int rescan) 1428 { 1429 uint order_id; 1430 1431 if (id == SCAN_WILD_CARD) 1432 for (id = 0; id < shost->max_id; ++id) { 1433 /* 1434 * XXX adapter drivers when possible (FCP, iSCSI) 1435 * could modify max_id to match the current max, 1436 * not the absolute max. 1437 * 1438 * XXX add a shost id iterator, so for example, 1439 * the FC ID can be the same as a target id 1440 * without a huge overhead of sparse id's. 1441 */ 1442 if (shost->reverse_ordering) 1443 /* 1444 * Scan from high to low id. 1445 */ 1446 order_id = shost->max_id - id - 1; 1447 else 1448 order_id = id; 1449 __scsi_scan_target(&shost->shost_gendev, channel, 1450 order_id, lun, rescan); 1451 } 1452 else 1453 __scsi_scan_target(&shost->shost_gendev, channel, 1454 id, lun, rescan); 1455 } 1456 1457 int scsi_scan_host_selected(struct Scsi_Host *shost, unsigned int channel, 1458 unsigned int id, unsigned int lun, int rescan) 1459 { 1460 SCSI_LOG_SCAN_BUS(3, shost_printk (KERN_INFO, shost, 1461 "%s: <%u:%u:%u>\n", 1462 __FUNCTION__, channel, id, lun)); 1463 1464 if (((channel != SCAN_WILD_CARD) && (channel > shost->max_channel)) || 1465 ((id != SCAN_WILD_CARD) && (id > shost->max_id)) || 1466 ((lun != SCAN_WILD_CARD) && (lun > shost->max_lun))) 1467 return -EINVAL; 1468 1469 mutex_lock(&shost->scan_mutex); 1470 if (scsi_host_scan_allowed(shost)) { 1471 if (channel == SCAN_WILD_CARD) 1472 for (channel = 0; channel <= shost->max_channel; 1473 channel++) 1474 scsi_scan_channel(shost, channel, id, lun, 1475 rescan); 1476 else 1477 scsi_scan_channel(shost, channel, id, lun, rescan); 1478 } 1479 mutex_unlock(&shost->scan_mutex); 1480 1481 return 0; 1482 } 1483 1484 /** 1485 * scsi_scan_host - scan the given adapter 1486 * @shost: adapter to scan 1487 **/ 1488 void scsi_scan_host(struct Scsi_Host *shost) 1489 { 1490 scsi_scan_host_selected(shost, SCAN_WILD_CARD, SCAN_WILD_CARD, 1491 SCAN_WILD_CARD, 0); 1492 } 1493 EXPORT_SYMBOL(scsi_scan_host); 1494 1495 void scsi_forget_host(struct Scsi_Host *shost) 1496 { 1497 struct scsi_device *sdev; 1498 unsigned long flags; 1499 1500 restart: 1501 spin_lock_irqsave(shost->host_lock, flags); 1502 list_for_each_entry(sdev, &shost->__devices, siblings) { 1503 if (sdev->sdev_state == SDEV_DEL) 1504 continue; 1505 spin_unlock_irqrestore(shost->host_lock, flags); 1506 __scsi_remove_device(sdev); 1507 goto restart; 1508 } 1509 spin_unlock_irqrestore(shost->host_lock, flags); 1510 } 1511 1512 /* 1513 * Function: scsi_get_host_dev() 1514 * 1515 * Purpose: Create a scsi_device that points to the host adapter itself. 1516 * 1517 * Arguments: SHpnt - Host that needs a scsi_device 1518 * 1519 * Lock status: None assumed. 1520 * 1521 * Returns: The scsi_device or NULL 1522 * 1523 * Notes: 1524 * Attach a single scsi_device to the Scsi_Host - this should 1525 * be made to look like a "pseudo-device" that points to the 1526 * HA itself. 1527 * 1528 * Note - this device is not accessible from any high-level 1529 * drivers (including generics), which is probably not 1530 * optimal. We can add hooks later to attach 1531 */ 1532 struct scsi_device *scsi_get_host_dev(struct Scsi_Host *shost) 1533 { 1534 struct scsi_device *sdev = NULL; 1535 struct scsi_target *starget; 1536 1537 mutex_lock(&shost->scan_mutex); 1538 if (!scsi_host_scan_allowed(shost)) 1539 goto out; 1540 starget = scsi_alloc_target(&shost->shost_gendev, 0, shost->this_id); 1541 if (!starget) 1542 goto out; 1543 1544 sdev = scsi_alloc_sdev(starget, 0, NULL); 1545 if (sdev) { 1546 sdev->sdev_gendev.parent = get_device(&starget->dev); 1547 sdev->borken = 0; 1548 } 1549 put_device(&starget->dev); 1550 out: 1551 mutex_unlock(&shost->scan_mutex); 1552 return sdev; 1553 } 1554 EXPORT_SYMBOL(scsi_get_host_dev); 1555 1556 /* 1557 * Function: scsi_free_host_dev() 1558 * 1559 * Purpose: Free a scsi_device that points to the host adapter itself. 1560 * 1561 * Arguments: SHpnt - Host that needs a scsi_device 1562 * 1563 * Lock status: None assumed. 1564 * 1565 * Returns: Nothing 1566 * 1567 * Notes: 1568 */ 1569 void scsi_free_host_dev(struct scsi_device *sdev) 1570 { 1571 BUG_ON(sdev->id != sdev->host->this_id); 1572 1573 scsi_destroy_sdev(sdev); 1574 } 1575 EXPORT_SYMBOL(scsi_free_host_dev); 1576 1577