1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Horst Hummel <Horst.Hummel@de.ibm.com> 5 * Carsten Otte <Cotte@de.ibm.com> 6 * Martin Schwidefsky <schwidefsky@de.ibm.com> 7 * Bugreports.to..: <Linux390@de.ibm.com> 8 * Copyright IBM Corp. 1999,2001 9 * 10 * Device mapping and dasd= parameter parsing functions. All devmap 11 * functions may not be called from interrupt context. In particular 12 * dasd_get_device is a no-no from interrupt context. 13 * 14 */ 15 16 #include <linux/ctype.h> 17 #include <linux/init.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 21 #include <asm/machine.h> 22 #include <asm/debug.h> 23 #include <linux/uaccess.h> 24 #include <asm/ipl.h> 25 26 #define DASD_MAX_PARAMS 256 27 28 #include "dasd_int.h" 29 30 struct kmem_cache *dasd_page_cache; 31 EXPORT_SYMBOL_GPL(dasd_page_cache); 32 33 /* 34 * dasd_devmap_t is used to store the features and the relation 35 * between device number and device index. To find a dasd_devmap_t 36 * that corresponds to a device number of a device index each 37 * dasd_devmap_t is added to two linked lists, one to search by 38 * the device number and one to search by the device index. As 39 * soon as big minor numbers are available the device index list 40 * can be removed since the device number will then be identical 41 * to the device index. 42 */ 43 struct dasd_devmap { 44 struct list_head list; 45 char bus_id[DASD_BUS_ID_SIZE]; 46 unsigned int devindex; 47 unsigned short features; 48 struct dasd_device *device; 49 struct dasd_copy_relation *copy; 50 unsigned int aq_mask; 51 }; 52 53 /* 54 * Parameter parsing functions for dasd= parameter. The syntax is: 55 * <devno> : (0x)?[0-9a-fA-F]+ 56 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ 57 * <feature> : ro 58 * <feature_list> : \(<feature>(:<feature>)*\) 59 * <devno-range> : <devno>(-<devno>)?<feature_list>? 60 * <busid-range> : <busid>(-<busid>)?<feature_list>? 61 * <devices> : <devno-range>|<busid-range> 62 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod 63 * 64 * <dasd> : autodetect|probeonly|<devices>(,<devices>)* 65 */ 66 67 int dasd_probeonly = 0; /* is true, when probeonly mode is active */ 68 int dasd_autodetect = 0; /* is true, when autodetection is active */ 69 int dasd_nopav = 0; /* is true, when PAV is disabled */ 70 EXPORT_SYMBOL_GPL(dasd_nopav); 71 int dasd_nofcx; /* disable High Performance Ficon */ 72 EXPORT_SYMBOL_GPL(dasd_nofcx); 73 74 /* 75 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement 76 * it is named 'dasd' to directly be filled by insmod with the comma separated 77 * strings when running as a module. 78 */ 79 static char *dasd[DASD_MAX_PARAMS]; 80 module_param_array(dasd, charp, NULL, S_IRUGO); 81 82 /* 83 * Single spinlock to protect devmap and servermap structures and lists. 84 */ 85 static DEFINE_SPINLOCK(dasd_devmap_lock); 86 87 /* 88 * Hash lists for devmap structures. 89 */ 90 static struct list_head dasd_hashlists[256]; 91 int dasd_max_devindex; 92 93 static struct dasd_devmap *dasd_add_busid(const char *, int); 94 95 static inline int 96 dasd_hash_busid(const char *bus_id) 97 { 98 int hash, i; 99 100 hash = 0; 101 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++) 102 hash += *bus_id; 103 return hash & 0xff; 104 } 105 106 #ifndef MODULE 107 static int __init dasd_call_setup(char *opt) 108 { 109 static int i __initdata; 110 char *tmp; 111 112 while (i < DASD_MAX_PARAMS) { 113 tmp = strsep(&opt, ","); 114 if (!tmp) 115 break; 116 117 dasd[i++] = tmp; 118 } 119 120 return 1; 121 } 122 123 __setup ("dasd=", dasd_call_setup); 124 #endif /* #ifndef MODULE */ 125 126 #define DASD_IPLDEV "ipldev" 127 128 /* 129 * Read a device busid/devno from a string. 130 */ 131 static int dasd_busid(char *str, int *id0, int *id1, int *devno) 132 { 133 unsigned int val; 134 char *tok; 135 136 /* Interpret ipldev busid */ 137 if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) { 138 if (ipl_info.type != IPL_TYPE_CCW) { 139 pr_err("The IPL device is not a CCW device\n"); 140 return -EINVAL; 141 } 142 *id0 = 0; 143 *id1 = ipl_info.data.ccw.dev_id.ssid; 144 *devno = ipl_info.data.ccw.dev_id.devno; 145 146 return 0; 147 } 148 149 /* Old style 0xXXXX or XXXX */ 150 if (!kstrtouint(str, 16, &val)) { 151 *id0 = *id1 = 0; 152 if (val > 0xffff) 153 return -EINVAL; 154 *devno = val; 155 return 0; 156 } 157 158 /* New style x.y.z busid */ 159 tok = strsep(&str, "."); 160 if (kstrtouint(tok, 16, &val) || val > 0xff) 161 return -EINVAL; 162 *id0 = val; 163 164 tok = strsep(&str, "."); 165 if (kstrtouint(tok, 16, &val) || val > 0xff) 166 return -EINVAL; 167 *id1 = val; 168 169 tok = strsep(&str, "."); 170 if (kstrtouint(tok, 16, &val) || val > 0xffff) 171 return -EINVAL; 172 *devno = val; 173 174 return 0; 175 } 176 177 /* 178 * Read colon separated list of dasd features. 179 */ 180 static int __init dasd_feature_list(char *str) 181 { 182 int features, len, rc; 183 184 features = 0; 185 rc = 0; 186 187 if (!str) 188 return DASD_FEATURE_DEFAULT; 189 190 while (1) { 191 for (len = 0; 192 str[len] && str[len] != ':' && str[len] != ')'; len++); 193 if (len == 2 && !strncmp(str, "ro", 2)) 194 features |= DASD_FEATURE_READONLY; 195 else if (len == 4 && !strncmp(str, "diag", 4)) 196 features |= DASD_FEATURE_USEDIAG; 197 else if (len == 3 && !strncmp(str, "raw", 3)) 198 features |= DASD_FEATURE_USERAW; 199 else if (len == 6 && !strncmp(str, "erplog", 6)) 200 features |= DASD_FEATURE_ERPLOG; 201 else if (len == 8 && !strncmp(str, "failfast", 8)) 202 features |= DASD_FEATURE_FAILFAST; 203 else { 204 pr_warn("%.*s is not a supported device option\n", 205 len, str); 206 rc = -EINVAL; 207 } 208 str += len; 209 if (*str != ':') 210 break; 211 str++; 212 } 213 214 return rc ? : features; 215 } 216 217 /* 218 * Try to match the first element on the comma separated parse string 219 * with one of the known keywords. If a keyword is found, take the approprate 220 * action and return a pointer to the residual string. If the first element 221 * could not be matched to any keyword then return an error code. 222 */ 223 static int __init dasd_parse_keyword(char *keyword) 224 { 225 int length = strlen(keyword); 226 227 if (strncmp("autodetect", keyword, length) == 0) { 228 dasd_autodetect = 1; 229 pr_info("The autodetection mode has been activated\n"); 230 return 0; 231 } 232 if (strncmp("probeonly", keyword, length) == 0) { 233 dasd_probeonly = 1; 234 pr_info("The probeonly mode has been activated\n"); 235 return 0; 236 } 237 if (strncmp("nopav", keyword, length) == 0) { 238 if (machine_is_vm()) 239 pr_info("'nopav' is not supported on z/VM\n"); 240 else { 241 dasd_nopav = 1; 242 pr_info("PAV support has be deactivated\n"); 243 } 244 return 0; 245 } 246 if (strncmp("nofcx", keyword, length) == 0) { 247 dasd_nofcx = 1; 248 pr_info("High Performance FICON support has been " 249 "deactivated\n"); 250 return 0; 251 } 252 if (strncmp("fixedbuffers", keyword, length) == 0) { 253 if (dasd_page_cache) 254 return 0; 255 dasd_page_cache = 256 kmem_cache_create("dasd_page_cache", PAGE_SIZE, 257 PAGE_SIZE, SLAB_CACHE_DMA, 258 NULL); 259 if (!dasd_page_cache) 260 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, " 261 "fixed buffer mode disabled."); 262 else 263 DBF_EVENT(DBF_INFO, "%s", 264 "turning on fixed buffer mode"); 265 return 0; 266 } 267 268 return -EINVAL; 269 } 270 271 /* 272 * Split a string of a device range into its pieces and return the from, to, and 273 * feature parts separately. 274 * e.g.: 275 * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog 276 * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw 277 * 0x4321 -> from: 0x4321 to: null features: null 278 */ 279 static int __init dasd_evaluate_range_param(char *range, char **from_str, 280 char **to_str, char **features_str) 281 { 282 int rc = 0; 283 284 /* Do we have a range or a single device? */ 285 if (strchr(range, '-')) { 286 *from_str = strsep(&range, "-"); 287 *to_str = strsep(&range, "("); 288 *features_str = strsep(&range, ")"); 289 } else { 290 *from_str = strsep(&range, "("); 291 *features_str = strsep(&range, ")"); 292 } 293 294 if (*features_str && !range) { 295 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n"); 296 rc = -EINVAL; 297 } 298 299 return rc; 300 } 301 302 /* 303 * Try to interprete the range string as a device number or a range of devices. 304 * If the interpretation is successful, create the matching dasd_devmap entries. 305 * If interpretation fails or in case of an error, return an error code. 306 */ 307 static int __init dasd_parse_range(const char *range) 308 { 309 struct dasd_devmap *devmap; 310 int from, from_id0, from_id1; 311 int to, to_id0, to_id1; 312 int features; 313 char bus_id[DASD_BUS_ID_SIZE + 1]; 314 char *features_str = NULL; 315 char *from_str = NULL; 316 char *to_str = NULL; 317 int rc = 0; 318 char *tmp; 319 320 tmp = kstrdup(range, GFP_KERNEL); 321 if (!tmp) 322 return -ENOMEM; 323 324 if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) { 325 rc = -EINVAL; 326 goto out; 327 } 328 329 if (dasd_busid(from_str, &from_id0, &from_id1, &from)) { 330 rc = -EINVAL; 331 goto out; 332 } 333 334 to = from; 335 to_id0 = from_id0; 336 to_id1 = from_id1; 337 if (to_str) { 338 if (dasd_busid(to_str, &to_id0, &to_id1, &to)) { 339 rc = -EINVAL; 340 goto out; 341 } 342 if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) { 343 pr_err("%s is not a valid device range\n", range); 344 rc = -EINVAL; 345 goto out; 346 } 347 } 348 349 features = dasd_feature_list(features_str); 350 if (features < 0) { 351 rc = -EINVAL; 352 goto out; 353 } 354 /* each device in dasd= parameter should be set initially online */ 355 features |= DASD_FEATURE_INITIAL_ONLINE; 356 while (from <= to) { 357 sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++); 358 devmap = dasd_add_busid(bus_id, features); 359 if (IS_ERR(devmap)) { 360 rc = PTR_ERR(devmap); 361 goto out; 362 } 363 } 364 365 out: 366 kfree(tmp); 367 368 return rc; 369 } 370 371 /* 372 * Parse parameters stored in dasd[] 373 * The 'dasd=...' parameter allows to specify a comma separated list of 374 * keywords and device ranges. The parameters in that list will be stored as 375 * separate elementes in dasd[]. 376 */ 377 int __init dasd_parse(void) 378 { 379 int rc, i; 380 char *cur; 381 382 rc = 0; 383 for (i = 0; i < DASD_MAX_PARAMS; i++) { 384 cur = dasd[i]; 385 if (!cur) 386 break; 387 if (*cur == '\0') 388 continue; 389 390 rc = dasd_parse_keyword(cur); 391 if (rc) 392 rc = dasd_parse_range(cur); 393 394 if (rc) 395 break; 396 } 397 398 return rc; 399 } 400 401 /* 402 * Add a devmap for the device specified by busid. It is possible that 403 * the devmap already exists (dasd= parameter). The order of the devices 404 * added through this function will define the kdevs for the individual 405 * devices. 406 */ 407 static struct dasd_devmap * 408 dasd_add_busid(const char *bus_id, int features) 409 { 410 struct dasd_devmap *devmap, *new, *tmp; 411 int hash; 412 413 new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); 414 if (!new) 415 return ERR_PTR(-ENOMEM); 416 spin_lock(&dasd_devmap_lock); 417 devmap = NULL; 418 hash = dasd_hash_busid(bus_id); 419 list_for_each_entry(tmp, &dasd_hashlists[hash], list) 420 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { 421 devmap = tmp; 422 break; 423 } 424 if (!devmap) { 425 /* This bus_id is new. */ 426 new->devindex = dasd_max_devindex++; 427 strscpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); 428 new->features = features; 429 new->device = NULL; 430 list_add(&new->list, &dasd_hashlists[hash]); 431 devmap = new; 432 new = NULL; 433 } 434 spin_unlock(&dasd_devmap_lock); 435 kfree(new); 436 return devmap; 437 } 438 439 static struct dasd_devmap * 440 dasd_find_busid_locked(const char *bus_id) 441 { 442 struct dasd_devmap *devmap, *tmp; 443 int hash; 444 445 devmap = ERR_PTR(-ENODEV); 446 hash = dasd_hash_busid(bus_id); 447 list_for_each_entry(tmp, &dasd_hashlists[hash], list) { 448 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { 449 devmap = tmp; 450 break; 451 } 452 } 453 return devmap; 454 } 455 456 /* 457 * Find devmap for device with given bus_id. 458 */ 459 static struct dasd_devmap * 460 dasd_find_busid(const char *bus_id) 461 { 462 struct dasd_devmap *devmap; 463 464 spin_lock(&dasd_devmap_lock); 465 devmap = dasd_find_busid_locked(bus_id); 466 spin_unlock(&dasd_devmap_lock); 467 return devmap; 468 } 469 470 /* 471 * Check if busid has been added to the list of dasd ranges. 472 */ 473 int 474 dasd_busid_known(const char *bus_id) 475 { 476 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; 477 } 478 479 /* 480 * Forget all about the device numbers added so far. 481 * This may only be called at module unload or system shutdown. 482 */ 483 static void 484 dasd_forget_ranges(void) 485 { 486 struct dasd_devmap *devmap, *n; 487 int i; 488 489 spin_lock(&dasd_devmap_lock); 490 for (i = 0; i < 256; i++) { 491 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { 492 BUG_ON(devmap->device != NULL); 493 list_del(&devmap->list); 494 kfree(devmap); 495 } 496 } 497 spin_unlock(&dasd_devmap_lock); 498 } 499 500 /* 501 * Find the device struct by its device index. 502 */ 503 struct dasd_device * 504 dasd_device_from_devindex(int devindex) 505 { 506 struct dasd_devmap *devmap, *tmp; 507 struct dasd_device *device; 508 int i; 509 510 spin_lock(&dasd_devmap_lock); 511 devmap = NULL; 512 for (i = 0; (i < 256) && !devmap; i++) 513 list_for_each_entry(tmp, &dasd_hashlists[i], list) 514 if (tmp->devindex == devindex) { 515 /* Found the devmap for the device. */ 516 devmap = tmp; 517 break; 518 } 519 if (devmap && devmap->device) { 520 device = devmap->device; 521 dasd_get_device(device); 522 } else 523 device = ERR_PTR(-ENODEV); 524 spin_unlock(&dasd_devmap_lock); 525 return device; 526 } 527 528 /* 529 * Return devmap for cdev. If no devmap exists yet, create one and 530 * connect it to the cdev. 531 */ 532 static struct dasd_devmap * 533 dasd_devmap_from_cdev(struct ccw_device *cdev) 534 { 535 struct dasd_devmap *devmap; 536 537 devmap = dasd_find_busid(dev_name(&cdev->dev)); 538 if (IS_ERR(devmap)) 539 devmap = dasd_add_busid(dev_name(&cdev->dev), 540 DASD_FEATURE_DEFAULT); 541 return devmap; 542 } 543 544 /* 545 * Create a dasd device structure for cdev. 546 */ 547 struct dasd_device * 548 dasd_create_device(struct ccw_device *cdev) 549 { 550 struct dasd_devmap *devmap; 551 struct dasd_device *device; 552 unsigned long flags; 553 int rc; 554 555 devmap = dasd_devmap_from_cdev(cdev); 556 if (IS_ERR(devmap)) 557 return (void *) devmap; 558 559 device = dasd_alloc_device(); 560 if (IS_ERR(device)) 561 return device; 562 atomic_set(&device->ref_count, 3); 563 564 spin_lock(&dasd_devmap_lock); 565 if (!devmap->device) { 566 devmap->device = device; 567 device->devindex = devmap->devindex; 568 device->features = devmap->features; 569 get_device(&cdev->dev); 570 device->cdev = cdev; 571 rc = 0; 572 } else 573 /* Someone else was faster. */ 574 rc = -EBUSY; 575 spin_unlock(&dasd_devmap_lock); 576 577 if (rc) { 578 dasd_free_device(device); 579 return ERR_PTR(rc); 580 } 581 582 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 583 dev_set_drvdata(&cdev->dev, device); 584 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 585 586 device->paths_info = kset_create_and_add("paths_info", NULL, 587 &device->cdev->dev.kobj); 588 if (!device->paths_info) 589 dev_warn(&cdev->dev, "Could not create paths_info kset\n"); 590 591 return device; 592 } 593 594 /* 595 * allocate a PPRC data structure and call the discipline function to fill 596 */ 597 static int dasd_devmap_get_pprc_status(struct dasd_device *device, 598 struct dasd_pprc_data_sc4 **data) 599 { 600 struct dasd_pprc_data_sc4 *temp; 601 602 if (!device->discipline || !device->discipline->pprc_status) { 603 dev_warn(&device->cdev->dev, "Unable to query copy relation status\n"); 604 return -EOPNOTSUPP; 605 } 606 temp = kzalloc(sizeof(*temp), GFP_KERNEL); 607 if (!temp) 608 return -ENOMEM; 609 610 /* get PPRC information from storage */ 611 if (device->discipline->pprc_status(device, temp)) { 612 dev_warn(&device->cdev->dev, "Error during copy relation status query\n"); 613 kfree(temp); 614 return -EINVAL; 615 } 616 *data = temp; 617 618 return 0; 619 } 620 621 /* 622 * find an entry in a PPRC device_info array by a given UID 623 * depending on the primary/secondary state of the device it has to be 624 * matched with the respective fields 625 */ 626 static int dasd_devmap_entry_from_pprc_data(struct dasd_pprc_data_sc4 *data, 627 struct dasd_uid uid, 628 bool primary) 629 { 630 int i; 631 632 for (i = 0; i < DASD_CP_ENTRIES; i++) { 633 if (primary) { 634 if (data->dev_info[i].prim_cu_ssid == uid.ssid && 635 data->dev_info[i].primary == uid.real_unit_addr) 636 return i; 637 } else { 638 if (data->dev_info[i].sec_cu_ssid == uid.ssid && 639 data->dev_info[i].secondary == uid.real_unit_addr) 640 return i; 641 } 642 } 643 return -1; 644 } 645 646 /* 647 * check the consistency of a specified copy relation by checking 648 * the following things: 649 * 650 * - is the given device part of a copy pair setup 651 * - does the state of the device match the state in the PPRC status data 652 * - does the device UID match with the UID in the PPRC status data 653 * - to prevent misrouted IO check if the given device is present in all 654 * related PPRC status data 655 */ 656 static int dasd_devmap_check_copy_relation(struct dasd_device *device, 657 struct dasd_copy_entry *entry, 658 struct dasd_pprc_data_sc4 *data, 659 struct dasd_copy_relation *copy) 660 { 661 struct dasd_pprc_data_sc4 *tmp_dat; 662 struct dasd_device *tmp_dev; 663 struct dasd_uid uid; 664 int i, j; 665 666 if (!device->discipline || !device->discipline->get_uid || 667 device->discipline->get_uid(device, &uid)) 668 return 1; 669 670 i = dasd_devmap_entry_from_pprc_data(data, uid, entry->primary); 671 if (i < 0) { 672 dev_warn(&device->cdev->dev, "Device not part of a copy relation\n"); 673 return 1; 674 } 675 676 /* double check which role the current device has */ 677 if (entry->primary) { 678 if (data->dev_info[i].flags & 0x80) { 679 dev_warn(&device->cdev->dev, "Copy pair secondary is setup as primary\n"); 680 return 1; 681 } 682 if (data->dev_info[i].prim_cu_ssid != uid.ssid || 683 data->dev_info[i].primary != uid.real_unit_addr) { 684 dev_warn(&device->cdev->dev, 685 "Primary device %s does not match copy pair status primary device %04x\n", 686 dev_name(&device->cdev->dev), 687 data->dev_info[i].prim_cu_ssid | 688 data->dev_info[i].primary); 689 return 1; 690 } 691 } else { 692 if (!(data->dev_info[i].flags & 0x80)) { 693 dev_warn(&device->cdev->dev, "Copy pair primary is setup as secondary\n"); 694 return 1; 695 } 696 if (data->dev_info[i].sec_cu_ssid != uid.ssid || 697 data->dev_info[i].secondary != uid.real_unit_addr) { 698 dev_warn(&device->cdev->dev, 699 "Secondary device %s does not match copy pair status secondary device %04x\n", 700 dev_name(&device->cdev->dev), 701 data->dev_info[i].sec_cu_ssid | 702 data->dev_info[i].secondary); 703 return 1; 704 } 705 } 706 707 /* 708 * the current device has to be part of the copy relation of all 709 * entries to prevent misrouted IO to another copy pair 710 */ 711 for (j = 0; j < DASD_CP_ENTRIES; j++) { 712 if (entry == ©->entry[j]) 713 tmp_dev = device; 714 else 715 tmp_dev = copy->entry[j].device; 716 717 if (!tmp_dev) 718 continue; 719 720 if (dasd_devmap_get_pprc_status(tmp_dev, &tmp_dat)) 721 return 1; 722 723 if (dasd_devmap_entry_from_pprc_data(tmp_dat, uid, entry->primary) < 0) { 724 dev_warn(&tmp_dev->cdev->dev, 725 "Copy pair relation does not contain device: %s\n", 726 dev_name(&device->cdev->dev)); 727 kfree(tmp_dat); 728 return 1; 729 } 730 kfree(tmp_dat); 731 } 732 return 0; 733 } 734 735 /* delete device from copy relation entry */ 736 static void dasd_devmap_delete_copy_relation_device(struct dasd_device *device) 737 { 738 struct dasd_copy_relation *copy; 739 int i; 740 741 if (!device->copy) 742 return; 743 744 copy = device->copy; 745 for (i = 0; i < DASD_CP_ENTRIES; i++) { 746 if (copy->entry[i].device == device) 747 copy->entry[i].device = NULL; 748 } 749 dasd_put_device(device); 750 device->copy = NULL; 751 } 752 753 /* 754 * read all required information for a copy relation setup and setup the device 755 * accordingly 756 */ 757 int dasd_devmap_set_device_copy_relation(struct ccw_device *cdev, 758 bool pprc_enabled) 759 { 760 struct dasd_pprc_data_sc4 *data = NULL; 761 struct dasd_copy_entry *entry = NULL; 762 struct dasd_copy_relation *copy; 763 struct dasd_devmap *devmap; 764 struct dasd_device *device; 765 int i, rc = 0; 766 767 devmap = dasd_devmap_from_cdev(cdev); 768 if (IS_ERR(devmap)) 769 return PTR_ERR(devmap); 770 771 device = devmap->device; 772 if (!device) 773 return -ENODEV; 774 775 copy = devmap->copy; 776 /* no copy pair setup for this device */ 777 if (!copy) 778 goto out; 779 780 rc = dasd_devmap_get_pprc_status(device, &data); 781 if (rc) 782 return rc; 783 784 /* print error if PPRC is requested but not enabled on storage server */ 785 if (!pprc_enabled) { 786 dev_err(&cdev->dev, "Copy relation not enabled on storage server\n"); 787 rc = -EINVAL; 788 goto out; 789 } 790 791 if (!data->dev_info[0].state) { 792 dev_warn(&device->cdev->dev, "Copy pair setup requested for device not in copy relation\n"); 793 rc = -EINVAL; 794 goto out; 795 } 796 /* find entry */ 797 for (i = 0; i < DASD_CP_ENTRIES; i++) { 798 if (copy->entry[i].configured && 799 strncmp(dev_name(&cdev->dev), 800 copy->entry[i].busid, DASD_BUS_ID_SIZE) == 0) { 801 entry = ©->entry[i]; 802 break; 803 } 804 } 805 if (!entry) { 806 dev_warn(&device->cdev->dev, "Copy relation entry not found\n"); 807 rc = -EINVAL; 808 goto out; 809 } 810 /* check if the copy relation is valid */ 811 if (dasd_devmap_check_copy_relation(device, entry, data, copy)) { 812 dev_warn(&device->cdev->dev, "Copy relation faulty\n"); 813 rc = -EINVAL; 814 goto out; 815 } 816 817 dasd_get_device(device); 818 copy->entry[i].device = device; 819 device->copy = copy; 820 out: 821 kfree(data); 822 return rc; 823 } 824 EXPORT_SYMBOL_GPL(dasd_devmap_set_device_copy_relation); 825 826 /* 827 * Wait queue for dasd_delete_device waits. 828 */ 829 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); 830 831 /* 832 * Remove a dasd device structure. The passed referenced 833 * is destroyed. 834 */ 835 void 836 dasd_delete_device(struct dasd_device *device) 837 { 838 struct ccw_device *cdev; 839 struct dasd_devmap *devmap; 840 unsigned long flags; 841 842 /* First remove device pointer from devmap. */ 843 devmap = dasd_find_busid(dev_name(&device->cdev->dev)); 844 BUG_ON(IS_ERR(devmap)); 845 spin_lock(&dasd_devmap_lock); 846 if (devmap->device != device) { 847 spin_unlock(&dasd_devmap_lock); 848 dasd_put_device(device); 849 return; 850 } 851 devmap->device = NULL; 852 spin_unlock(&dasd_devmap_lock); 853 854 /* Disconnect dasd_device structure from ccw_device structure. */ 855 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 856 dev_set_drvdata(&device->cdev->dev, NULL); 857 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 858 859 /* Remove copy relation */ 860 dasd_devmap_delete_copy_relation_device(device); 861 /* 862 * Drop ref_count by 3, one for the devmap reference, one for 863 * the cdev reference and one for the passed reference. 864 */ 865 atomic_sub(3, &device->ref_count); 866 867 /* Wait for reference counter to drop to zero. */ 868 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); 869 870 dasd_generic_free_discipline(device); 871 872 kset_unregister(device->paths_info); 873 874 /* Disconnect dasd_device structure from ccw_device structure. */ 875 cdev = device->cdev; 876 device->cdev = NULL; 877 878 /* Put ccw_device structure. */ 879 put_device(&cdev->dev); 880 881 /* Now the device structure can be freed. */ 882 dasd_free_device(device); 883 } 884 885 /* 886 * Reference counter dropped to zero. Wake up waiter 887 * in dasd_delete_device. 888 */ 889 void 890 dasd_put_device_wake(struct dasd_device *device) 891 { 892 wake_up(&dasd_delete_wq); 893 } 894 EXPORT_SYMBOL_GPL(dasd_put_device_wake); 895 896 /* 897 * Return dasd_device structure associated with cdev. 898 * This function needs to be called with the ccw device 899 * lock held. It can be used from interrupt context. 900 */ 901 struct dasd_device * 902 dasd_device_from_cdev_locked(struct ccw_device *cdev) 903 { 904 struct dasd_device *device = dev_get_drvdata(&cdev->dev); 905 906 if (!device) 907 return ERR_PTR(-ENODEV); 908 dasd_get_device(device); 909 return device; 910 } 911 912 /* 913 * Return dasd_device structure associated with cdev. 914 */ 915 struct dasd_device * 916 dasd_device_from_cdev(struct ccw_device *cdev) 917 { 918 struct dasd_device *device; 919 unsigned long flags; 920 921 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 922 device = dasd_device_from_cdev_locked(cdev); 923 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 924 return device; 925 } 926 927 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device) 928 { 929 struct dasd_devmap *devmap; 930 931 devmap = dasd_find_busid(dev_name(&device->cdev->dev)); 932 if (IS_ERR(devmap)) 933 return; 934 spin_lock(&dasd_devmap_lock); 935 gdp->private_data = devmap; 936 spin_unlock(&dasd_devmap_lock); 937 } 938 EXPORT_SYMBOL(dasd_add_link_to_gendisk); 939 940 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp) 941 { 942 struct dasd_device *device; 943 struct dasd_devmap *devmap; 944 945 if (!gdp->private_data) 946 return NULL; 947 device = NULL; 948 spin_lock(&dasd_devmap_lock); 949 devmap = gdp->private_data; 950 if (devmap && devmap->device) { 951 device = devmap->device; 952 dasd_get_device(device); 953 } 954 spin_unlock(&dasd_devmap_lock); 955 return device; 956 } 957 958 /* 959 * SECTION: files in sysfs 960 */ 961 962 /* 963 * failfast controls the behaviour, if no path is available 964 */ 965 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr, 966 char *buf) 967 { 968 struct dasd_devmap *devmap; 969 int ff_flag; 970 971 devmap = dasd_find_busid(dev_name(dev)); 972 if (!IS_ERR(devmap)) 973 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0; 974 else 975 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0; 976 return sysfs_emit(buf, ff_flag ? "1\n" : "0\n"); 977 } 978 979 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr, 980 const char *buf, size_t count) 981 { 982 unsigned int val; 983 int rc; 984 985 if (kstrtouint(buf, 0, &val) || val > 1) 986 return -EINVAL; 987 988 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val); 989 990 return rc ? : count; 991 } 992 993 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store); 994 995 /* 996 * readonly controls the readonly status of a dasd 997 */ 998 static ssize_t 999 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) 1000 { 1001 struct dasd_devmap *devmap; 1002 struct dasd_device *device; 1003 int ro_flag = 0; 1004 1005 devmap = dasd_find_busid(dev_name(dev)); 1006 if (IS_ERR(devmap)) 1007 goto out; 1008 1009 ro_flag = !!(devmap->features & DASD_FEATURE_READONLY); 1010 1011 spin_lock(&dasd_devmap_lock); 1012 device = devmap->device; 1013 if (device) 1014 ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags); 1015 spin_unlock(&dasd_devmap_lock); 1016 1017 out: 1018 return sysfs_emit(buf, ro_flag ? "1\n" : "0\n"); 1019 } 1020 1021 static ssize_t 1022 dasd_ro_store(struct device *dev, struct device_attribute *attr, 1023 const char *buf, size_t count) 1024 { 1025 struct ccw_device *cdev = to_ccwdev(dev); 1026 struct dasd_device *device; 1027 unsigned long flags; 1028 unsigned int val; 1029 int rc; 1030 1031 if (kstrtouint(buf, 0, &val) || val > 1) 1032 return -EINVAL; 1033 1034 rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val); 1035 if (rc) 1036 return rc; 1037 1038 device = dasd_device_from_cdev(cdev); 1039 if (IS_ERR(device)) 1040 return count; 1041 1042 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1043 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags); 1044 1045 if (!device->block || !device->block->gdp || 1046 test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 1047 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1048 goto out; 1049 } 1050 /* Increase open_count to avoid losing the block device */ 1051 atomic_inc(&device->block->open_count); 1052 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1053 1054 set_disk_ro(device->block->gdp, val); 1055 atomic_dec(&device->block->open_count); 1056 1057 out: 1058 dasd_put_device(device); 1059 1060 return count; 1061 } 1062 1063 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); 1064 /* 1065 * erplog controls the logging of ERP related data 1066 * (e.g. failing channel programs). 1067 */ 1068 static ssize_t 1069 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) 1070 { 1071 struct dasd_devmap *devmap; 1072 int erplog; 1073 1074 devmap = dasd_find_busid(dev_name(dev)); 1075 if (!IS_ERR(devmap)) 1076 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; 1077 else 1078 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; 1079 return sysfs_emit(buf, erplog ? "1\n" : "0\n"); 1080 } 1081 1082 static ssize_t 1083 dasd_erplog_store(struct device *dev, struct device_attribute *attr, 1084 const char *buf, size_t count) 1085 { 1086 unsigned int val; 1087 int rc; 1088 1089 if (kstrtouint(buf, 0, &val) || val > 1) 1090 return -EINVAL; 1091 1092 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val); 1093 1094 return rc ? : count; 1095 } 1096 1097 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store); 1098 1099 /* 1100 * use_diag controls whether the driver should use diag rather than ssch 1101 * to talk to the device 1102 */ 1103 static ssize_t 1104 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) 1105 { 1106 struct dasd_devmap *devmap; 1107 int use_diag; 1108 1109 devmap = dasd_find_busid(dev_name(dev)); 1110 if (!IS_ERR(devmap)) 1111 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; 1112 else 1113 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; 1114 return sysfs_emit(buf, use_diag ? "1\n" : "0\n"); 1115 } 1116 1117 static ssize_t 1118 dasd_use_diag_store(struct device *dev, struct device_attribute *attr, 1119 const char *buf, size_t count) 1120 { 1121 struct dasd_devmap *devmap; 1122 unsigned int val; 1123 ssize_t rc; 1124 1125 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 1126 if (IS_ERR(devmap)) 1127 return PTR_ERR(devmap); 1128 1129 if (kstrtouint(buf, 0, &val) || val > 1) 1130 return -EINVAL; 1131 1132 spin_lock(&dasd_devmap_lock); 1133 /* Changing diag discipline flag is only allowed in offline state. */ 1134 rc = count; 1135 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) { 1136 if (val) 1137 devmap->features |= DASD_FEATURE_USEDIAG; 1138 else 1139 devmap->features &= ~DASD_FEATURE_USEDIAG; 1140 } else 1141 rc = -EPERM; 1142 spin_unlock(&dasd_devmap_lock); 1143 return rc; 1144 } 1145 1146 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); 1147 1148 /* 1149 * use_raw controls whether the driver should give access to raw eckd data or 1150 * operate in standard mode 1151 */ 1152 static ssize_t 1153 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf) 1154 { 1155 struct dasd_devmap *devmap; 1156 int use_raw; 1157 1158 devmap = dasd_find_busid(dev_name(dev)); 1159 if (!IS_ERR(devmap)) 1160 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0; 1161 else 1162 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0; 1163 return sysfs_emit(buf, use_raw ? "1\n" : "0\n"); 1164 } 1165 1166 static ssize_t 1167 dasd_use_raw_store(struct device *dev, struct device_attribute *attr, 1168 const char *buf, size_t count) 1169 { 1170 struct dasd_devmap *devmap; 1171 ssize_t rc; 1172 unsigned long val; 1173 1174 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 1175 if (IS_ERR(devmap)) 1176 return PTR_ERR(devmap); 1177 1178 if ((kstrtoul(buf, 10, &val) != 0) || val > 1) 1179 return -EINVAL; 1180 1181 spin_lock(&dasd_devmap_lock); 1182 /* Changing diag discipline flag is only allowed in offline state. */ 1183 rc = count; 1184 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) { 1185 if (val) 1186 devmap->features |= DASD_FEATURE_USERAW; 1187 else 1188 devmap->features &= ~DASD_FEATURE_USERAW; 1189 } else 1190 rc = -EPERM; 1191 spin_unlock(&dasd_devmap_lock); 1192 return rc; 1193 } 1194 1195 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show, 1196 dasd_use_raw_store); 1197 1198 static ssize_t 1199 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr, 1200 const char *buf, size_t count) 1201 { 1202 struct ccw_device *cdev = to_ccwdev(dev); 1203 struct dasd_device *device; 1204 unsigned long flags; 1205 int rc; 1206 1207 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1208 device = dasd_device_from_cdev_locked(cdev); 1209 if (IS_ERR(device)) { 1210 rc = PTR_ERR(device); 1211 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1212 goto out; 1213 } 1214 1215 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || 1216 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 1217 /* Already doing offline processing */ 1218 dasd_put_device(device); 1219 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1220 rc = -EBUSY; 1221 goto out; 1222 } 1223 1224 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); 1225 dasd_put_device(device); 1226 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1227 1228 rc = ccw_device_set_offline(cdev); 1229 1230 out: 1231 return rc ? rc : count; 1232 } 1233 1234 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store); 1235 1236 static ssize_t 1237 dasd_access_show(struct device *dev, struct device_attribute *attr, 1238 char *buf) 1239 { 1240 struct ccw_device *cdev = to_ccwdev(dev); 1241 struct dasd_device *device; 1242 int count; 1243 1244 device = dasd_device_from_cdev(cdev); 1245 if (IS_ERR(device)) 1246 return PTR_ERR(device); 1247 1248 if (!device->discipline) 1249 count = -ENODEV; 1250 else if (!device->discipline->host_access_count) 1251 count = -EOPNOTSUPP; 1252 else 1253 count = device->discipline->host_access_count(device); 1254 1255 dasd_put_device(device); 1256 if (count < 0) 1257 return count; 1258 1259 return sysfs_emit(buf, "%d\n", count); 1260 } 1261 1262 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL); 1263 1264 static ssize_t 1265 dasd_discipline_show(struct device *dev, struct device_attribute *attr, 1266 char *buf) 1267 { 1268 struct dasd_device *device; 1269 ssize_t len; 1270 1271 device = dasd_device_from_cdev(to_ccwdev(dev)); 1272 if (IS_ERR(device)) 1273 goto out; 1274 else if (!device->discipline) { 1275 dasd_put_device(device); 1276 goto out; 1277 } else { 1278 len = sysfs_emit(buf, "%s\n", 1279 device->discipline->name); 1280 dasd_put_device(device); 1281 return len; 1282 } 1283 out: 1284 len = sysfs_emit(buf, "none\n"); 1285 return len; 1286 } 1287 1288 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); 1289 1290 static ssize_t 1291 dasd_device_status_show(struct device *dev, struct device_attribute *attr, 1292 char *buf) 1293 { 1294 struct dasd_device *device; 1295 ssize_t len; 1296 1297 device = dasd_device_from_cdev(to_ccwdev(dev)); 1298 if (!IS_ERR(device)) { 1299 switch (device->state) { 1300 case DASD_STATE_NEW: 1301 len = sysfs_emit(buf, "new\n"); 1302 break; 1303 case DASD_STATE_KNOWN: 1304 len = sysfs_emit(buf, "detected\n"); 1305 break; 1306 case DASD_STATE_BASIC: 1307 len = sysfs_emit(buf, "basic\n"); 1308 break; 1309 case DASD_STATE_UNFMT: 1310 len = sysfs_emit(buf, "unformatted\n"); 1311 break; 1312 case DASD_STATE_READY: 1313 len = sysfs_emit(buf, "ready\n"); 1314 break; 1315 case DASD_STATE_ONLINE: 1316 len = sysfs_emit(buf, "online\n"); 1317 break; 1318 default: 1319 len = sysfs_emit(buf, "no stat\n"); 1320 break; 1321 } 1322 dasd_put_device(device); 1323 } else 1324 len = sysfs_emit(buf, "unknown\n"); 1325 return len; 1326 } 1327 1328 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL); 1329 1330 static ssize_t dasd_alias_show(struct device *dev, 1331 struct device_attribute *attr, char *buf) 1332 { 1333 struct dasd_device *device; 1334 struct dasd_uid uid; 1335 1336 device = dasd_device_from_cdev(to_ccwdev(dev)); 1337 if (IS_ERR(device)) 1338 return sysfs_emit(buf, "0\n"); 1339 1340 if (device->discipline && device->discipline->get_uid && 1341 !device->discipline->get_uid(device, &uid)) { 1342 if (uid.type == UA_BASE_PAV_ALIAS || 1343 uid.type == UA_HYPER_PAV_ALIAS) { 1344 dasd_put_device(device); 1345 return sysfs_emit(buf, "1\n"); 1346 } 1347 } 1348 dasd_put_device(device); 1349 1350 return sysfs_emit(buf, "0\n"); 1351 } 1352 1353 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); 1354 1355 static ssize_t dasd_vendor_show(struct device *dev, 1356 struct device_attribute *attr, char *buf) 1357 { 1358 struct dasd_device *device; 1359 struct dasd_uid uid; 1360 char *vendor; 1361 1362 device = dasd_device_from_cdev(to_ccwdev(dev)); 1363 vendor = ""; 1364 if (IS_ERR(device)) 1365 return sysfs_emit(buf, "%s\n", vendor); 1366 1367 if (device->discipline && device->discipline->get_uid && 1368 !device->discipline->get_uid(device, &uid)) 1369 vendor = uid.vendor; 1370 1371 dasd_put_device(device); 1372 1373 return sysfs_emit(buf, "%s\n", vendor); 1374 } 1375 1376 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); 1377 1378 static ssize_t 1379 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) 1380 { 1381 char uid_string[DASD_UID_STRLEN]; 1382 struct dasd_device *device; 1383 struct dasd_uid uid; 1384 char ua_string[3]; 1385 1386 device = dasd_device_from_cdev(to_ccwdev(dev)); 1387 uid_string[0] = 0; 1388 if (IS_ERR(device)) 1389 return sysfs_emit(buf, "%s\n", uid_string); 1390 1391 if (device->discipline && device->discipline->get_uid && 1392 !device->discipline->get_uid(device, &uid)) { 1393 switch (uid.type) { 1394 case UA_BASE_DEVICE: 1395 snprintf(ua_string, sizeof(ua_string), "%02x", 1396 uid.real_unit_addr); 1397 break; 1398 case UA_BASE_PAV_ALIAS: 1399 snprintf(ua_string, sizeof(ua_string), "%02x", 1400 uid.base_unit_addr); 1401 break; 1402 case UA_HYPER_PAV_ALIAS: 1403 snprintf(ua_string, sizeof(ua_string), "xx"); 1404 break; 1405 default: 1406 /* should not happen, treat like base device */ 1407 snprintf(ua_string, sizeof(ua_string), "%02x", 1408 uid.real_unit_addr); 1409 break; 1410 } 1411 1412 snprintf(uid_string, sizeof(uid_string), "%s.%s.%04x.%s%s%s", 1413 uid.vendor, uid.serial, uid.ssid, ua_string, 1414 uid.vduit[0] ? "." : "", uid.vduit); 1415 } 1416 dasd_put_device(device); 1417 1418 return sysfs_emit(buf, "%s\n", uid_string); 1419 } 1420 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); 1421 1422 /* 1423 * extended error-reporting 1424 */ 1425 static ssize_t 1426 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) 1427 { 1428 struct dasd_devmap *devmap; 1429 int eer_flag; 1430 1431 devmap = dasd_find_busid(dev_name(dev)); 1432 if (!IS_ERR(devmap) && devmap->device) 1433 eer_flag = dasd_eer_enabled(devmap->device); 1434 else 1435 eer_flag = 0; 1436 return sysfs_emit(buf, eer_flag ? "1\n" : "0\n"); 1437 } 1438 1439 static ssize_t 1440 dasd_eer_store(struct device *dev, struct device_attribute *attr, 1441 const char *buf, size_t count) 1442 { 1443 struct dasd_device *device; 1444 unsigned int val; 1445 int rc = 0; 1446 1447 device = dasd_device_from_cdev(to_ccwdev(dev)); 1448 if (IS_ERR(device)) 1449 return PTR_ERR(device); 1450 1451 if (kstrtouint(buf, 0, &val) || val > 1) 1452 return -EINVAL; 1453 1454 if (val) 1455 rc = dasd_eer_enable(device); 1456 else 1457 dasd_eer_disable(device); 1458 1459 dasd_put_device(device); 1460 1461 return rc ? : count; 1462 } 1463 1464 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); 1465 1466 /* 1467 * aq_mask controls if the DASD should be quiesced on certain triggers 1468 * The aq_mask attribute is interpreted as bitmap of the DASD_EER_* triggers. 1469 */ 1470 static ssize_t dasd_aq_mask_show(struct device *dev, struct device_attribute *attr, 1471 char *buf) 1472 { 1473 struct dasd_devmap *devmap; 1474 unsigned int aq_mask = 0; 1475 1476 devmap = dasd_find_busid(dev_name(dev)); 1477 if (!IS_ERR(devmap)) 1478 aq_mask = devmap->aq_mask; 1479 1480 return sysfs_emit(buf, "%d\n", aq_mask); 1481 } 1482 1483 static ssize_t dasd_aq_mask_store(struct device *dev, struct device_attribute *attr, 1484 const char *buf, size_t count) 1485 { 1486 struct dasd_devmap *devmap; 1487 unsigned int val; 1488 1489 if (kstrtouint(buf, 0, &val) || val > DASD_EER_VALID) 1490 return -EINVAL; 1491 1492 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 1493 if (IS_ERR(devmap)) 1494 return PTR_ERR(devmap); 1495 1496 spin_lock(&dasd_devmap_lock); 1497 devmap->aq_mask = val; 1498 if (devmap->device) 1499 devmap->device->aq_mask = devmap->aq_mask; 1500 spin_unlock(&dasd_devmap_lock); 1501 1502 return count; 1503 } 1504 1505 static DEVICE_ATTR(aq_mask, 0644, dasd_aq_mask_show, dasd_aq_mask_store); 1506 1507 /* 1508 * aq_requeue controls if requests are returned to the blocklayer on quiesce 1509 * or if requests are only not started 1510 */ 1511 static ssize_t dasd_aqr_show(struct device *dev, struct device_attribute *attr, 1512 char *buf) 1513 { 1514 struct dasd_devmap *devmap; 1515 int flag; 1516 1517 devmap = dasd_find_busid(dev_name(dev)); 1518 if (!IS_ERR(devmap)) 1519 flag = (devmap->features & DASD_FEATURE_REQUEUEQUIESCE) != 0; 1520 else 1521 flag = (DASD_FEATURE_DEFAULT & 1522 DASD_FEATURE_REQUEUEQUIESCE) != 0; 1523 return sysfs_emit(buf, "%d\n", flag); 1524 } 1525 1526 static ssize_t dasd_aqr_store(struct device *dev, struct device_attribute *attr, 1527 const char *buf, size_t count) 1528 { 1529 bool val; 1530 int rc; 1531 1532 if (kstrtobool(buf, &val)) 1533 return -EINVAL; 1534 1535 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_REQUEUEQUIESCE, val); 1536 1537 return rc ? : count; 1538 } 1539 1540 static DEVICE_ATTR(aq_requeue, 0644, dasd_aqr_show, dasd_aqr_store); 1541 1542 /* 1543 * aq_timeouts controls how much retries have to time out until 1544 * a device gets autoquiesced 1545 */ 1546 static ssize_t 1547 dasd_aq_timeouts_show(struct device *dev, struct device_attribute *attr, 1548 char *buf) 1549 { 1550 struct dasd_device *device; 1551 int len; 1552 1553 device = dasd_device_from_cdev(to_ccwdev(dev)); 1554 if (IS_ERR(device)) 1555 return -ENODEV; 1556 len = sysfs_emit(buf, "%u\n", device->aq_timeouts); 1557 dasd_put_device(device); 1558 return len; 1559 } 1560 1561 static ssize_t 1562 dasd_aq_timeouts_store(struct device *dev, struct device_attribute *attr, 1563 const char *buf, size_t count) 1564 { 1565 struct dasd_device *device; 1566 unsigned int val; 1567 1568 device = dasd_device_from_cdev(to_ccwdev(dev)); 1569 if (IS_ERR(device)) 1570 return -ENODEV; 1571 1572 if ((kstrtouint(buf, 10, &val) != 0) || 1573 val > DASD_RETRIES_MAX || val == 0) { 1574 dasd_put_device(device); 1575 return -EINVAL; 1576 } 1577 1578 if (val) 1579 device->aq_timeouts = val; 1580 1581 dasd_put_device(device); 1582 return count; 1583 } 1584 1585 static DEVICE_ATTR(aq_timeouts, 0644, dasd_aq_timeouts_show, 1586 dasd_aq_timeouts_store); 1587 1588 /* 1589 * expiration time for default requests 1590 */ 1591 static ssize_t 1592 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf) 1593 { 1594 struct dasd_device *device; 1595 int len; 1596 1597 device = dasd_device_from_cdev(to_ccwdev(dev)); 1598 if (IS_ERR(device)) 1599 return -ENODEV; 1600 len = sysfs_emit(buf, "%lu\n", device->default_expires); 1601 dasd_put_device(device); 1602 return len; 1603 } 1604 1605 static ssize_t 1606 dasd_expires_store(struct device *dev, struct device_attribute *attr, 1607 const char *buf, size_t count) 1608 { 1609 struct dasd_device *device; 1610 unsigned long val; 1611 1612 device = dasd_device_from_cdev(to_ccwdev(dev)); 1613 if (IS_ERR(device)) 1614 return -ENODEV; 1615 1616 if ((kstrtoul(buf, 10, &val) != 0) || 1617 (val > DASD_EXPIRES_MAX) || val == 0) { 1618 dasd_put_device(device); 1619 return -EINVAL; 1620 } 1621 1622 if (val) 1623 device->default_expires = val; 1624 1625 dasd_put_device(device); 1626 return count; 1627 } 1628 1629 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); 1630 1631 static ssize_t 1632 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) 1633 { 1634 struct dasd_device *device; 1635 int len; 1636 1637 device = dasd_device_from_cdev(to_ccwdev(dev)); 1638 if (IS_ERR(device)) 1639 return -ENODEV; 1640 len = sysfs_emit(buf, "%lu\n", device->default_retries); 1641 dasd_put_device(device); 1642 return len; 1643 } 1644 1645 static ssize_t 1646 dasd_retries_store(struct device *dev, struct device_attribute *attr, 1647 const char *buf, size_t count) 1648 { 1649 struct dasd_device *device; 1650 unsigned long val; 1651 1652 device = dasd_device_from_cdev(to_ccwdev(dev)); 1653 if (IS_ERR(device)) 1654 return -ENODEV; 1655 1656 if ((kstrtoul(buf, 10, &val) != 0) || 1657 (val > DASD_RETRIES_MAX)) { 1658 dasd_put_device(device); 1659 return -EINVAL; 1660 } 1661 1662 if (val) 1663 device->default_retries = val; 1664 1665 dasd_put_device(device); 1666 return count; 1667 } 1668 1669 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); 1670 1671 static ssize_t 1672 dasd_timeout_show(struct device *dev, struct device_attribute *attr, 1673 char *buf) 1674 { 1675 struct dasd_device *device; 1676 int len; 1677 1678 device = dasd_device_from_cdev(to_ccwdev(dev)); 1679 if (IS_ERR(device)) 1680 return -ENODEV; 1681 len = sysfs_emit(buf, "%lu\n", device->blk_timeout); 1682 dasd_put_device(device); 1683 return len; 1684 } 1685 1686 static ssize_t 1687 dasd_timeout_store(struct device *dev, struct device_attribute *attr, 1688 const char *buf, size_t count) 1689 { 1690 struct dasd_device *device; 1691 unsigned long val; 1692 1693 device = dasd_device_from_cdev(to_ccwdev(dev)); 1694 if (IS_ERR(device) || !device->block) 1695 return -ENODEV; 1696 1697 if ((kstrtoul(buf, 10, &val) != 0) || 1698 val > UINT_MAX / HZ) { 1699 dasd_put_device(device); 1700 return -EINVAL; 1701 } 1702 if (!device->block->gdp) { 1703 dasd_put_device(device); 1704 return -ENODEV; 1705 } 1706 1707 device->blk_timeout = val; 1708 blk_queue_rq_timeout(device->block->gdp->queue, val * HZ); 1709 1710 dasd_put_device(device); 1711 return count; 1712 } 1713 1714 static DEVICE_ATTR(timeout, 0644, 1715 dasd_timeout_show, dasd_timeout_store); 1716 1717 1718 static ssize_t 1719 dasd_path_reset_store(struct device *dev, struct device_attribute *attr, 1720 const char *buf, size_t count) 1721 { 1722 struct dasd_device *device; 1723 unsigned int val; 1724 1725 device = dasd_device_from_cdev(to_ccwdev(dev)); 1726 if (IS_ERR(device)) 1727 return -ENODEV; 1728 1729 if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff) 1730 val = 0; 1731 1732 if (device->discipline && device->discipline->reset_path) 1733 device->discipline->reset_path(device, (__u8) val); 1734 1735 dasd_put_device(device); 1736 return count; 1737 } 1738 1739 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store); 1740 1741 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr, 1742 char *buf) 1743 { 1744 struct dasd_device *device; 1745 int hpf; 1746 1747 device = dasd_device_from_cdev(to_ccwdev(dev)); 1748 if (IS_ERR(device)) 1749 return -ENODEV; 1750 if (!device->discipline || !device->discipline->hpf_enabled) { 1751 dasd_put_device(device); 1752 return sysfs_emit(buf, "%d\n", dasd_nofcx); 1753 } 1754 hpf = device->discipline->hpf_enabled(device); 1755 dasd_put_device(device); 1756 return sysfs_emit(buf, "%d\n", hpf); 1757 } 1758 1759 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL); 1760 1761 static ssize_t dasd_reservation_policy_show(struct device *dev, 1762 struct device_attribute *attr, 1763 char *buf) 1764 { 1765 struct dasd_devmap *devmap; 1766 int rc = 0; 1767 1768 devmap = dasd_find_busid(dev_name(dev)); 1769 if (IS_ERR(devmap)) { 1770 rc = sysfs_emit(buf, "ignore\n"); 1771 } else { 1772 spin_lock(&dasd_devmap_lock); 1773 if (devmap->features & DASD_FEATURE_FAILONSLCK) 1774 rc = sysfs_emit(buf, "fail\n"); 1775 else 1776 rc = sysfs_emit(buf, "ignore\n"); 1777 spin_unlock(&dasd_devmap_lock); 1778 } 1779 return rc; 1780 } 1781 1782 static ssize_t dasd_reservation_policy_store(struct device *dev, 1783 struct device_attribute *attr, 1784 const char *buf, size_t count) 1785 { 1786 struct ccw_device *cdev = to_ccwdev(dev); 1787 int rc; 1788 1789 if (sysfs_streq("ignore", buf)) 1790 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0); 1791 else if (sysfs_streq("fail", buf)) 1792 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1); 1793 else 1794 rc = -EINVAL; 1795 1796 return rc ? : count; 1797 } 1798 1799 static DEVICE_ATTR(reservation_policy, 0644, 1800 dasd_reservation_policy_show, dasd_reservation_policy_store); 1801 1802 static ssize_t dasd_reservation_state_show(struct device *dev, 1803 struct device_attribute *attr, 1804 char *buf) 1805 { 1806 struct dasd_device *device; 1807 int rc = 0; 1808 1809 device = dasd_device_from_cdev(to_ccwdev(dev)); 1810 if (IS_ERR(device)) 1811 return sysfs_emit(buf, "none\n"); 1812 1813 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) 1814 rc = sysfs_emit(buf, "reserved\n"); 1815 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) 1816 rc = sysfs_emit(buf, "lost\n"); 1817 else 1818 rc = sysfs_emit(buf, "none\n"); 1819 dasd_put_device(device); 1820 return rc; 1821 } 1822 1823 static ssize_t dasd_reservation_state_store(struct device *dev, 1824 struct device_attribute *attr, 1825 const char *buf, size_t count) 1826 { 1827 struct dasd_device *device; 1828 int rc = 0; 1829 1830 device = dasd_device_from_cdev(to_ccwdev(dev)); 1831 if (IS_ERR(device)) 1832 return -ENODEV; 1833 if (sysfs_streq("reset", buf)) 1834 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags); 1835 else 1836 rc = -EINVAL; 1837 dasd_put_device(device); 1838 1839 if (rc) 1840 return rc; 1841 else 1842 return count; 1843 } 1844 1845 static DEVICE_ATTR(last_known_reservation_state, 0644, 1846 dasd_reservation_state_show, dasd_reservation_state_store); 1847 1848 static ssize_t dasd_pm_show(struct device *dev, 1849 struct device_attribute *attr, char *buf) 1850 { 1851 struct dasd_device *device; 1852 u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm; 1853 1854 device = dasd_device_from_cdev(to_ccwdev(dev)); 1855 if (IS_ERR(device)) 1856 return sysfs_emit(buf, "0\n"); 1857 1858 opm = dasd_path_get_opm(device); 1859 nppm = dasd_path_get_nppm(device); 1860 cablepm = dasd_path_get_cablepm(device); 1861 cuirpm = dasd_path_get_cuirpm(device); 1862 hpfpm = dasd_path_get_hpfpm(device); 1863 ifccpm = dasd_path_get_ifccpm(device); 1864 dasd_put_device(device); 1865 1866 return sysfs_emit(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm, 1867 cablepm, cuirpm, hpfpm, ifccpm); 1868 } 1869 1870 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL); 1871 1872 /* 1873 * threshold value for IFCC/CCC errors 1874 */ 1875 static ssize_t 1876 dasd_path_threshold_show(struct device *dev, 1877 struct device_attribute *attr, char *buf) 1878 { 1879 struct dasd_device *device; 1880 int len; 1881 1882 device = dasd_device_from_cdev(to_ccwdev(dev)); 1883 if (IS_ERR(device)) 1884 return -ENODEV; 1885 len = sysfs_emit(buf, "%lu\n", device->path_thrhld); 1886 dasd_put_device(device); 1887 return len; 1888 } 1889 1890 static ssize_t 1891 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr, 1892 const char *buf, size_t count) 1893 { 1894 struct dasd_device *device; 1895 unsigned long flags; 1896 unsigned long val; 1897 1898 device = dasd_device_from_cdev(to_ccwdev(dev)); 1899 if (IS_ERR(device)) 1900 return -ENODEV; 1901 1902 if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) { 1903 dasd_put_device(device); 1904 return -EINVAL; 1905 } 1906 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); 1907 device->path_thrhld = val; 1908 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); 1909 dasd_put_device(device); 1910 return count; 1911 } 1912 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show, 1913 dasd_path_threshold_store); 1914 1915 /* 1916 * configure if path is disabled after IFCC/CCC error threshold is 1917 * exceeded 1918 */ 1919 static ssize_t 1920 dasd_path_autodisable_show(struct device *dev, 1921 struct device_attribute *attr, char *buf) 1922 { 1923 struct dasd_devmap *devmap; 1924 int flag; 1925 1926 devmap = dasd_find_busid(dev_name(dev)); 1927 if (!IS_ERR(devmap)) 1928 flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0; 1929 else 1930 flag = (DASD_FEATURE_DEFAULT & 1931 DASD_FEATURE_PATH_AUTODISABLE) != 0; 1932 return sysfs_emit(buf, flag ? "1\n" : "0\n"); 1933 } 1934 1935 static ssize_t 1936 dasd_path_autodisable_store(struct device *dev, 1937 struct device_attribute *attr, 1938 const char *buf, size_t count) 1939 { 1940 unsigned int val; 1941 int rc; 1942 1943 if (kstrtouint(buf, 0, &val) || val > 1) 1944 return -EINVAL; 1945 1946 rc = dasd_set_feature(to_ccwdev(dev), 1947 DASD_FEATURE_PATH_AUTODISABLE, val); 1948 1949 return rc ? : count; 1950 } 1951 1952 static DEVICE_ATTR(path_autodisable, 0644, 1953 dasd_path_autodisable_show, 1954 dasd_path_autodisable_store); 1955 /* 1956 * interval for IFCC/CCC checks 1957 * meaning time with no IFCC/CCC error before the error counter 1958 * gets reset 1959 */ 1960 static ssize_t 1961 dasd_path_interval_show(struct device *dev, 1962 struct device_attribute *attr, char *buf) 1963 { 1964 struct dasd_device *device; 1965 int len; 1966 1967 device = dasd_device_from_cdev(to_ccwdev(dev)); 1968 if (IS_ERR(device)) 1969 return -ENODEV; 1970 len = sysfs_emit(buf, "%lu\n", device->path_interval); 1971 dasd_put_device(device); 1972 return len; 1973 } 1974 1975 static ssize_t 1976 dasd_path_interval_store(struct device *dev, struct device_attribute *attr, 1977 const char *buf, size_t count) 1978 { 1979 struct dasd_device *device; 1980 unsigned long flags; 1981 unsigned long val; 1982 1983 device = dasd_device_from_cdev(to_ccwdev(dev)); 1984 if (IS_ERR(device)) 1985 return -ENODEV; 1986 1987 if ((kstrtoul(buf, 10, &val) != 0) || 1988 (val > DASD_INTERVAL_MAX) || val == 0) { 1989 dasd_put_device(device); 1990 return -EINVAL; 1991 } 1992 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); 1993 if (val) 1994 device->path_interval = val; 1995 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); 1996 dasd_put_device(device); 1997 return count; 1998 } 1999 2000 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show, 2001 dasd_path_interval_store); 2002 2003 static ssize_t 2004 dasd_device_fcs_show(struct device *dev, struct device_attribute *attr, 2005 char *buf) 2006 { 2007 struct dasd_device *device; 2008 int fc_sec; 2009 int rc; 2010 2011 device = dasd_device_from_cdev(to_ccwdev(dev)); 2012 if (IS_ERR(device)) 2013 return -ENODEV; 2014 fc_sec = dasd_path_get_fcs_device(device); 2015 if (fc_sec == -EINVAL) 2016 rc = sysfs_emit(buf, "Inconsistent\n"); 2017 else 2018 rc = sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec)); 2019 dasd_put_device(device); 2020 2021 return rc; 2022 } 2023 static DEVICE_ATTR(fc_security, 0444, dasd_device_fcs_show, NULL); 2024 2025 static ssize_t 2026 dasd_path_fcs_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) 2027 { 2028 struct dasd_path *path = to_dasd_path(kobj); 2029 unsigned int fc_sec = path->fc_security; 2030 2031 return sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec)); 2032 } 2033 2034 static struct kobj_attribute path_fcs_attribute = 2035 __ATTR(fc_security, 0444, dasd_path_fcs_show, NULL); 2036 2037 /* 2038 * print copy relation in the form 2039 * primary,secondary[1] primary,secondary[2], ... 2040 */ 2041 static ssize_t 2042 dasd_copy_pair_show(struct device *dev, 2043 struct device_attribute *attr, char *buf) 2044 { 2045 char prim_busid[DASD_BUS_ID_SIZE]; 2046 struct dasd_copy_relation *copy; 2047 struct dasd_devmap *devmap; 2048 int len = 0; 2049 int i; 2050 2051 devmap = dasd_find_busid(dev_name(dev)); 2052 if (IS_ERR(devmap)) 2053 return -ENODEV; 2054 2055 if (!devmap->copy) 2056 return -ENODEV; 2057 2058 copy = devmap->copy; 2059 /* find primary */ 2060 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2061 if (copy->entry[i].configured && copy->entry[i].primary) { 2062 strscpy(prim_busid, copy->entry[i].busid, 2063 DASD_BUS_ID_SIZE); 2064 break; 2065 } 2066 } 2067 if (i == DASD_CP_ENTRIES) 2068 goto out; 2069 2070 /* print all secondary */ 2071 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2072 if (copy->entry[i].configured && !copy->entry[i].primary) 2073 len += sysfs_emit_at(buf, len, "%s,%s ", prim_busid, 2074 copy->entry[i].busid); 2075 } 2076 2077 len += sysfs_emit_at(buf, len, "\n"); 2078 out: 2079 return len; 2080 } 2081 2082 static int dasd_devmap_set_copy_relation(struct dasd_devmap *devmap, 2083 struct dasd_copy_relation *copy, 2084 char *busid, bool primary) 2085 { 2086 int i; 2087 2088 /* find free entry */ 2089 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2090 /* current bus_id already included, nothing to do */ 2091 if (copy->entry[i].configured && 2092 strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0) 2093 return 0; 2094 2095 if (!copy->entry[i].configured) 2096 break; 2097 } 2098 if (i == DASD_CP_ENTRIES) 2099 return -EINVAL; 2100 2101 copy->entry[i].configured = true; 2102 strscpy(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE); 2103 if (primary) { 2104 copy->active = ©->entry[i]; 2105 copy->entry[i].primary = true; 2106 } 2107 if (!devmap->copy) 2108 devmap->copy = copy; 2109 2110 return 0; 2111 } 2112 2113 static void dasd_devmap_del_copy_relation(struct dasd_copy_relation *copy, 2114 char *busid) 2115 { 2116 int i; 2117 2118 spin_lock(&dasd_devmap_lock); 2119 /* find entry */ 2120 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2121 if (copy->entry[i].configured && 2122 strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0) 2123 break; 2124 } 2125 if (i == DASD_CP_ENTRIES || !copy->entry[i].configured) { 2126 spin_unlock(&dasd_devmap_lock); 2127 return; 2128 } 2129 2130 copy->entry[i].configured = false; 2131 memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE); 2132 if (copy->active == ©->entry[i]) { 2133 copy->active = NULL; 2134 copy->entry[i].primary = false; 2135 } 2136 spin_unlock(&dasd_devmap_lock); 2137 } 2138 2139 static int dasd_devmap_clear_copy_relation(struct device *dev) 2140 { 2141 struct dasd_copy_relation *copy; 2142 struct dasd_devmap *devmap; 2143 int i, rc = 1; 2144 2145 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 2146 if (IS_ERR(devmap)) 2147 return 1; 2148 2149 spin_lock(&dasd_devmap_lock); 2150 if (!devmap->copy) 2151 goto out; 2152 2153 copy = devmap->copy; 2154 /* first check if all secondary devices are offline*/ 2155 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2156 if (!copy->entry[i].configured) 2157 continue; 2158 2159 if (copy->entry[i].device == copy->active->device) 2160 continue; 2161 2162 if (copy->entry[i].device) 2163 goto out; 2164 } 2165 /* clear all devmap entries */ 2166 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2167 if (strlen(copy->entry[i].busid) == 0) 2168 continue; 2169 if (copy->entry[i].device) { 2170 dasd_put_device(copy->entry[i].device); 2171 copy->entry[i].device->copy = NULL; 2172 copy->entry[i].device = NULL; 2173 } 2174 devmap = dasd_find_busid_locked(copy->entry[i].busid); 2175 devmap->copy = NULL; 2176 memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE); 2177 } 2178 kfree(copy); 2179 rc = 0; 2180 out: 2181 spin_unlock(&dasd_devmap_lock); 2182 return rc; 2183 } 2184 2185 /* 2186 * parse BUSIDs from a copy pair 2187 */ 2188 static int dasd_devmap_parse_busid(const char *buf, char *prim_busid, 2189 char *sec_busid) 2190 { 2191 char *primary, *secondary, *tmp, *pt; 2192 int id0, id1, id2; 2193 2194 pt = kstrdup(buf, GFP_KERNEL); 2195 tmp = pt; 2196 if (!tmp) 2197 return -ENOMEM; 2198 2199 primary = strsep(&tmp, ","); 2200 if (!primary) { 2201 kfree(pt); 2202 return -EINVAL; 2203 } 2204 secondary = strsep(&tmp, ","); 2205 if (!secondary) { 2206 kfree(pt); 2207 return -EINVAL; 2208 } 2209 if (dasd_busid(primary, &id0, &id1, &id2)) { 2210 kfree(pt); 2211 return -EINVAL; 2212 } 2213 sprintf(prim_busid, "%01x.%01x.%04x", id0, id1, id2); 2214 if (dasd_busid(secondary, &id0, &id1, &id2)) { 2215 kfree(pt); 2216 return -EINVAL; 2217 } 2218 sprintf(sec_busid, "%01x.%01x.%04x", id0, id1, id2); 2219 kfree(pt); 2220 2221 return 0; 2222 } 2223 2224 static ssize_t dasd_copy_pair_store(struct device *dev, 2225 struct device_attribute *attr, 2226 const char *buf, size_t count) 2227 { 2228 struct dasd_devmap *prim_devmap, *sec_devmap; 2229 char prim_busid[DASD_BUS_ID_SIZE]; 2230 char sec_busid[DASD_BUS_ID_SIZE]; 2231 struct dasd_copy_relation *copy; 2232 struct dasd_device *device; 2233 bool pprc_enabled; 2234 int rc; 2235 2236 if (strncmp(buf, "clear", strlen("clear")) == 0) { 2237 if (dasd_devmap_clear_copy_relation(dev)) 2238 return -EINVAL; 2239 return count; 2240 } 2241 2242 rc = dasd_devmap_parse_busid(buf, prim_busid, sec_busid); 2243 if (rc) 2244 return rc; 2245 2246 if (strncmp(dev_name(dev), prim_busid, DASD_BUS_ID_SIZE) != 0 && 2247 strncmp(dev_name(dev), sec_busid, DASD_BUS_ID_SIZE) != 0) 2248 return -EINVAL; 2249 2250 /* allocate primary devmap if needed */ 2251 prim_devmap = dasd_find_busid(prim_busid); 2252 if (IS_ERR(prim_devmap)) { 2253 prim_devmap = dasd_add_busid(prim_busid, DASD_FEATURE_DEFAULT); 2254 if (IS_ERR(prim_devmap)) 2255 return PTR_ERR(prim_devmap); 2256 } 2257 2258 /* allocate secondary devmap if needed */ 2259 sec_devmap = dasd_find_busid(sec_busid); 2260 if (IS_ERR(sec_devmap)) { 2261 sec_devmap = dasd_add_busid(sec_busid, DASD_FEATURE_DEFAULT); 2262 if (IS_ERR(sec_devmap)) 2263 return PTR_ERR(sec_devmap); 2264 } 2265 2266 /* setting copy relation is only allowed for offline secondary */ 2267 if (sec_devmap->device) 2268 return -EINVAL; 2269 2270 if (prim_devmap->copy) { 2271 copy = prim_devmap->copy; 2272 } else if (sec_devmap->copy) { 2273 copy = sec_devmap->copy; 2274 } else { 2275 copy = kzalloc(sizeof(*copy), GFP_KERNEL); 2276 if (!copy) 2277 return -ENOMEM; 2278 } 2279 spin_lock(&dasd_devmap_lock); 2280 rc = dasd_devmap_set_copy_relation(prim_devmap, copy, prim_busid, true); 2281 if (rc) { 2282 spin_unlock(&dasd_devmap_lock); 2283 return rc; 2284 } 2285 rc = dasd_devmap_set_copy_relation(sec_devmap, copy, sec_busid, false); 2286 if (rc) { 2287 spin_unlock(&dasd_devmap_lock); 2288 return rc; 2289 } 2290 spin_unlock(&dasd_devmap_lock); 2291 2292 /* if primary device is already online call device setup directly */ 2293 if (prim_devmap->device && !prim_devmap->device->copy) { 2294 device = prim_devmap->device; 2295 if (device->discipline->pprc_enabled) { 2296 pprc_enabled = device->discipline->pprc_enabled(device); 2297 rc = dasd_devmap_set_device_copy_relation(device->cdev, 2298 pprc_enabled); 2299 } else { 2300 rc = -EOPNOTSUPP; 2301 } 2302 } 2303 if (rc) { 2304 dasd_devmap_del_copy_relation(copy, prim_busid); 2305 dasd_devmap_del_copy_relation(copy, sec_busid); 2306 count = rc; 2307 } 2308 2309 return count; 2310 } 2311 static DEVICE_ATTR(copy_pair, 0644, dasd_copy_pair_show, 2312 dasd_copy_pair_store); 2313 2314 static ssize_t 2315 dasd_copy_role_show(struct device *dev, 2316 struct device_attribute *attr, char *buf) 2317 { 2318 struct dasd_copy_relation *copy; 2319 struct dasd_device *device; 2320 int len, i; 2321 2322 device = dasd_device_from_cdev(to_ccwdev(dev)); 2323 if (IS_ERR(device)) 2324 return -ENODEV; 2325 2326 if (!device->copy) { 2327 len = sysfs_emit(buf, "none\n"); 2328 goto out; 2329 } 2330 copy = device->copy; 2331 /* only the active device is primary */ 2332 if (copy->active->device == device) { 2333 len = sysfs_emit(buf, "primary\n"); 2334 goto out; 2335 } 2336 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2337 if (copy->entry[i].device == device) { 2338 len = sysfs_emit(buf, "secondary\n"); 2339 goto out; 2340 } 2341 } 2342 /* not in the list, no COPY role */ 2343 len = sysfs_emit(buf, "none\n"); 2344 out: 2345 dasd_put_device(device); 2346 return len; 2347 } 2348 static DEVICE_ATTR(copy_role, 0444, dasd_copy_role_show, NULL); 2349 2350 static ssize_t dasd_device_ping(struct device *dev, 2351 struct device_attribute *attr, 2352 const char *buf, size_t count) 2353 { 2354 struct dasd_device *device; 2355 size_t rc; 2356 2357 device = dasd_device_from_cdev(to_ccwdev(dev)); 2358 if (IS_ERR(device)) 2359 return -ENODEV; 2360 2361 /* 2362 * do not try during offline processing 2363 * early check only 2364 * the sleep_on function itself checks for offline 2365 * processing again 2366 */ 2367 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 2368 rc = -EBUSY; 2369 goto out; 2370 } 2371 if (!device->discipline || !device->discipline->device_ping) { 2372 rc = -EOPNOTSUPP; 2373 goto out; 2374 } 2375 rc = device->discipline->device_ping(device); 2376 if (!rc) 2377 rc = count; 2378 out: 2379 dasd_put_device(device); 2380 return rc; 2381 } 2382 static DEVICE_ATTR(ping, 0200, NULL, dasd_device_ping); 2383 2384 #define DASD_DEFINE_ATTR(_name, _func) \ 2385 static ssize_t dasd_##_name##_show(struct device *dev, \ 2386 struct device_attribute *attr, \ 2387 char *buf) \ 2388 { \ 2389 struct ccw_device *cdev = to_ccwdev(dev); \ 2390 struct dasd_device *device = dasd_device_from_cdev(cdev); \ 2391 int val = 0; \ 2392 \ 2393 if (IS_ERR(device)) \ 2394 return -ENODEV; \ 2395 if (device->discipline && _func) \ 2396 val = _func(device); \ 2397 dasd_put_device(device); \ 2398 \ 2399 return sysfs_emit(buf, "%d\n", val); \ 2400 } \ 2401 static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \ 2402 2403 DASD_DEFINE_ATTR(ese, device->discipline->is_ese); 2404 DASD_DEFINE_ATTR(extent_size, device->discipline->ext_size); 2405 DASD_DEFINE_ATTR(pool_id, device->discipline->ext_pool_id); 2406 DASD_DEFINE_ATTR(space_configured, device->discipline->space_configured); 2407 DASD_DEFINE_ATTR(space_allocated, device->discipline->space_allocated); 2408 DASD_DEFINE_ATTR(logical_capacity, device->discipline->logical_capacity); 2409 DASD_DEFINE_ATTR(warn_threshold, device->discipline->ext_pool_warn_thrshld); 2410 DASD_DEFINE_ATTR(cap_at_warnlevel, device->discipline->ext_pool_cap_at_warnlevel); 2411 DASD_DEFINE_ATTR(pool_oos, device->discipline->ext_pool_oos); 2412 2413 static struct attribute * dasd_attrs[] = { 2414 &dev_attr_readonly.attr, 2415 &dev_attr_discipline.attr, 2416 &dev_attr_status.attr, 2417 &dev_attr_alias.attr, 2418 &dev_attr_vendor.attr, 2419 &dev_attr_uid.attr, 2420 &dev_attr_use_diag.attr, 2421 &dev_attr_raw_track_access.attr, 2422 &dev_attr_eer_enabled.attr, 2423 &dev_attr_erplog.attr, 2424 &dev_attr_failfast.attr, 2425 &dev_attr_expires.attr, 2426 &dev_attr_retries.attr, 2427 &dev_attr_timeout.attr, 2428 &dev_attr_reservation_policy.attr, 2429 &dev_attr_last_known_reservation_state.attr, 2430 &dev_attr_safe_offline.attr, 2431 &dev_attr_host_access_count.attr, 2432 &dev_attr_path_masks.attr, 2433 &dev_attr_path_threshold.attr, 2434 &dev_attr_path_autodisable.attr, 2435 &dev_attr_path_interval.attr, 2436 &dev_attr_path_reset.attr, 2437 &dev_attr_hpf.attr, 2438 &dev_attr_ese.attr, 2439 &dev_attr_fc_security.attr, 2440 &dev_attr_copy_pair.attr, 2441 &dev_attr_copy_role.attr, 2442 &dev_attr_ping.attr, 2443 &dev_attr_aq_mask.attr, 2444 &dev_attr_aq_requeue.attr, 2445 &dev_attr_aq_timeouts.attr, 2446 NULL, 2447 }; 2448 2449 static const struct attribute_group dasd_attr_group = { 2450 .attrs = dasd_attrs, 2451 }; 2452 2453 static struct attribute *capacity_attrs[] = { 2454 &dev_attr_space_configured.attr, 2455 &dev_attr_space_allocated.attr, 2456 &dev_attr_logical_capacity.attr, 2457 NULL, 2458 }; 2459 2460 static const struct attribute_group capacity_attr_group = { 2461 .name = "capacity", 2462 .attrs = capacity_attrs, 2463 }; 2464 2465 static struct attribute *ext_pool_attrs[] = { 2466 &dev_attr_pool_id.attr, 2467 &dev_attr_extent_size.attr, 2468 &dev_attr_warn_threshold.attr, 2469 &dev_attr_cap_at_warnlevel.attr, 2470 &dev_attr_pool_oos.attr, 2471 NULL, 2472 }; 2473 2474 static const struct attribute_group ext_pool_attr_group = { 2475 .name = "extent_pool", 2476 .attrs = ext_pool_attrs, 2477 }; 2478 2479 const struct attribute_group *dasd_dev_groups[] = { 2480 &dasd_attr_group, 2481 &capacity_attr_group, 2482 &ext_pool_attr_group, 2483 NULL, 2484 }; 2485 EXPORT_SYMBOL_GPL(dasd_dev_groups); 2486 2487 /* 2488 * Return value of the specified feature. 2489 */ 2490 int 2491 dasd_get_feature(struct ccw_device *cdev, int feature) 2492 { 2493 struct dasd_devmap *devmap; 2494 2495 devmap = dasd_find_busid(dev_name(&cdev->dev)); 2496 if (IS_ERR(devmap)) 2497 return PTR_ERR(devmap); 2498 2499 return ((devmap->features & feature) != 0); 2500 } 2501 2502 /* 2503 * Set / reset given feature. 2504 * Flag indicates whether to set (!=0) or the reset (=0) the feature. 2505 */ 2506 int 2507 dasd_set_feature(struct ccw_device *cdev, int feature, int flag) 2508 { 2509 struct dasd_devmap *devmap; 2510 2511 devmap = dasd_devmap_from_cdev(cdev); 2512 if (IS_ERR(devmap)) 2513 return PTR_ERR(devmap); 2514 2515 spin_lock(&dasd_devmap_lock); 2516 if (flag) 2517 devmap->features |= feature; 2518 else 2519 devmap->features &= ~feature; 2520 if (devmap->device) 2521 devmap->device->features = devmap->features; 2522 spin_unlock(&dasd_devmap_lock); 2523 return 0; 2524 } 2525 EXPORT_SYMBOL(dasd_set_feature); 2526 2527 static struct attribute *paths_info_attrs[] = { 2528 &path_fcs_attribute.attr, 2529 NULL, 2530 }; 2531 ATTRIBUTE_GROUPS(paths_info); 2532 2533 static struct kobj_type path_attr_type = { 2534 .release = dasd_path_release, 2535 .default_groups = paths_info_groups, 2536 .sysfs_ops = &kobj_sysfs_ops, 2537 }; 2538 2539 static void dasd_path_init_kobj(struct dasd_device *device, int chp) 2540 { 2541 device->path[chp].kobj.kset = device->paths_info; 2542 kobject_init(&device->path[chp].kobj, &path_attr_type); 2543 } 2544 2545 void dasd_path_create_kobj(struct dasd_device *device, int chp) 2546 { 2547 int rc; 2548 2549 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) 2550 return; 2551 if (!device->paths_info) { 2552 dev_warn(&device->cdev->dev, "Unable to create paths objects\n"); 2553 return; 2554 } 2555 if (device->path[chp].in_sysfs) 2556 return; 2557 if (!device->path[chp].conf_data) 2558 return; 2559 2560 dasd_path_init_kobj(device, chp); 2561 2562 rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x", 2563 device->path[chp].cssid, device->path[chp].chpid); 2564 if (rc) 2565 kobject_put(&device->path[chp].kobj); 2566 device->path[chp].in_sysfs = true; 2567 } 2568 EXPORT_SYMBOL(dasd_path_create_kobj); 2569 2570 void dasd_path_create_kobjects(struct dasd_device *device) 2571 { 2572 u8 lpm, opm; 2573 2574 opm = dasd_path_get_opm(device); 2575 for (lpm = 0x80; lpm; lpm >>= 1) { 2576 if (!(lpm & opm)) 2577 continue; 2578 dasd_path_create_kobj(device, pathmask_to_pos(lpm)); 2579 } 2580 } 2581 EXPORT_SYMBOL(dasd_path_create_kobjects); 2582 2583 static void dasd_path_remove_kobj(struct dasd_device *device, int chp) 2584 { 2585 if (device->path[chp].in_sysfs) { 2586 kobject_put(&device->path[chp].kobj); 2587 device->path[chp].in_sysfs = false; 2588 } 2589 } 2590 2591 /* 2592 * As we keep kobjects for the lifetime of a device, this function must not be 2593 * called anywhere but in the context of offlining a device. 2594 */ 2595 void dasd_path_remove_kobjects(struct dasd_device *device) 2596 { 2597 int i; 2598 2599 for (i = 0; i < 8; i++) 2600 dasd_path_remove_kobj(device, i); 2601 } 2602 EXPORT_SYMBOL(dasd_path_remove_kobjects); 2603 2604 int 2605 dasd_devmap_init(void) 2606 { 2607 int i; 2608 2609 /* Initialize devmap structures. */ 2610 dasd_max_devindex = 0; 2611 for (i = 0; i < 256; i++) 2612 INIT_LIST_HEAD(&dasd_hashlists[i]); 2613 return 0; 2614 } 2615 2616 void 2617 dasd_devmap_exit(void) 2618 { 2619 dasd_forget_ranges(); 2620 } 2621