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