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