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