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