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 #define KMSG_COMPONENT "dasd" 17 18 #include <linux/ctype.h> 19 #include <linux/init.h> 20 #include <linux/module.h> 21 #include <linux/slab.h> 22 23 #include <asm/debug.h> 24 #include <linux/uaccess.h> 25 #include <asm/ipl.h> 26 27 /* This is ugly... */ 28 #define PRINTK_HEADER "dasd_devmap:" 29 #define DASD_MAX_PARAMS 256 30 31 #include "dasd_int.h" 32 33 struct kmem_cache *dasd_page_cache; 34 EXPORT_SYMBOL_GPL(dasd_page_cache); 35 36 /* 37 * dasd_devmap_t is used to store the features and the relation 38 * between device number and device index. To find a dasd_devmap_t 39 * that corresponds to a device number of a device index each 40 * dasd_devmap_t is added to two linked lists, one to search by 41 * the device number and one to search by the device index. As 42 * soon as big minor numbers are available the device index list 43 * can be removed since the device number will then be identical 44 * to the device index. 45 */ 46 struct dasd_devmap { 47 struct list_head list; 48 char bus_id[DASD_BUS_ID_SIZE]; 49 unsigned int devindex; 50 unsigned short features; 51 struct dasd_device *device; 52 struct dasd_copy_relation *copy; 53 unsigned int aq_mask; 54 }; 55 56 /* 57 * Parameter parsing functions for dasd= parameter. The syntax is: 58 * <devno> : (0x)?[0-9a-fA-F]+ 59 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ 60 * <feature> : ro 61 * <feature_list> : \(<feature>(:<feature>)*\) 62 * <devno-range> : <devno>(-<devno>)?<feature_list>? 63 * <busid-range> : <busid>(-<busid>)?<feature_list>? 64 * <devices> : <devno-range>|<busid-range> 65 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod 66 * 67 * <dasd> : autodetect|probeonly|<devices>(,<devices>)* 68 */ 69 70 int dasd_probeonly = 0; /* is true, when probeonly mode is active */ 71 int dasd_autodetect = 0; /* is true, when autodetection is active */ 72 int dasd_nopav = 0; /* is true, when PAV is disabled */ 73 EXPORT_SYMBOL_GPL(dasd_nopav); 74 int dasd_nofcx; /* disable High Performance Ficon */ 75 EXPORT_SYMBOL_GPL(dasd_nofcx); 76 77 /* 78 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement 79 * it is named 'dasd' to directly be filled by insmod with the comma separated 80 * strings when running as a module. 81 */ 82 static char *dasd[DASD_MAX_PARAMS]; 83 module_param_array(dasd, charp, NULL, S_IRUGO); 84 85 /* 86 * Single spinlock to protect devmap and servermap structures and lists. 87 */ 88 static DEFINE_SPINLOCK(dasd_devmap_lock); 89 90 /* 91 * Hash lists for devmap structures. 92 */ 93 static struct list_head dasd_hashlists[256]; 94 int dasd_max_devindex; 95 96 static struct dasd_devmap *dasd_add_busid(const char *, int); 97 98 static inline int 99 dasd_hash_busid(const char *bus_id) 100 { 101 int hash, i; 102 103 hash = 0; 104 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++) 105 hash += *bus_id; 106 return hash & 0xff; 107 } 108 109 #ifndef MODULE 110 static int __init dasd_call_setup(char *opt) 111 { 112 static int i __initdata; 113 char *tmp; 114 115 while (i < DASD_MAX_PARAMS) { 116 tmp = strsep(&opt, ","); 117 if (!tmp) 118 break; 119 120 dasd[i++] = tmp; 121 } 122 123 return 1; 124 } 125 126 __setup ("dasd=", dasd_call_setup); 127 #endif /* #ifndef MODULE */ 128 129 #define DASD_IPLDEV "ipldev" 130 131 /* 132 * Read a device busid/devno from a string. 133 */ 134 static int dasd_busid(char *str, int *id0, int *id1, int *devno) 135 { 136 unsigned int val; 137 char *tok; 138 139 /* Interpret ipldev busid */ 140 if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) { 141 if (ipl_info.type != IPL_TYPE_CCW) { 142 pr_err("The IPL device is not a CCW device\n"); 143 return -EINVAL; 144 } 145 *id0 = 0; 146 *id1 = ipl_info.data.ccw.dev_id.ssid; 147 *devno = ipl_info.data.ccw.dev_id.devno; 148 149 return 0; 150 } 151 152 /* Old style 0xXXXX or XXXX */ 153 if (!kstrtouint(str, 16, &val)) { 154 *id0 = *id1 = 0; 155 if (val > 0xffff) 156 return -EINVAL; 157 *devno = val; 158 return 0; 159 } 160 161 /* New style x.y.z busid */ 162 tok = strsep(&str, "."); 163 if (kstrtouint(tok, 16, &val) || val > 0xff) 164 return -EINVAL; 165 *id0 = val; 166 167 tok = strsep(&str, "."); 168 if (kstrtouint(tok, 16, &val) || val > 0xff) 169 return -EINVAL; 170 *id1 = val; 171 172 tok = strsep(&str, "."); 173 if (kstrtouint(tok, 16, &val) || val > 0xffff) 174 return -EINVAL; 175 *devno = val; 176 177 return 0; 178 } 179 180 /* 181 * Read colon separated list of dasd features. 182 */ 183 static int __init dasd_feature_list(char *str) 184 { 185 int features, len, rc; 186 187 features = 0; 188 rc = 0; 189 190 if (!str) 191 return DASD_FEATURE_DEFAULT; 192 193 while (1) { 194 for (len = 0; 195 str[len] && str[len] != ':' && str[len] != ')'; len++); 196 if (len == 2 && !strncmp(str, "ro", 2)) 197 features |= DASD_FEATURE_READONLY; 198 else if (len == 4 && !strncmp(str, "diag", 4)) 199 features |= DASD_FEATURE_USEDIAG; 200 else if (len == 3 && !strncmp(str, "raw", 3)) 201 features |= DASD_FEATURE_USERAW; 202 else if (len == 6 && !strncmp(str, "erplog", 6)) 203 features |= DASD_FEATURE_ERPLOG; 204 else if (len == 8 && !strncmp(str, "failfast", 8)) 205 features |= DASD_FEATURE_FAILFAST; 206 else { 207 pr_warn("%.*s is not a supported device option\n", 208 len, str); 209 rc = -EINVAL; 210 } 211 str += len; 212 if (*str != ':') 213 break; 214 str++; 215 } 216 217 return rc ? : features; 218 } 219 220 /* 221 * Try to match the first element on the comma separated parse string 222 * with one of the known keywords. If a keyword is found, take the approprate 223 * action and return a pointer to the residual string. If the first element 224 * could not be matched to any keyword then return an error code. 225 */ 226 static int __init dasd_parse_keyword(char *keyword) 227 { 228 int length = strlen(keyword); 229 230 if (strncmp("autodetect", keyword, length) == 0) { 231 dasd_autodetect = 1; 232 pr_info("The autodetection mode has been activated\n"); 233 return 0; 234 } 235 if (strncmp("probeonly", keyword, length) == 0) { 236 dasd_probeonly = 1; 237 pr_info("The probeonly mode has been activated\n"); 238 return 0; 239 } 240 if (strncmp("nopav", keyword, length) == 0) { 241 if (MACHINE_IS_VM) 242 pr_info("'nopav' is not supported on z/VM\n"); 243 else { 244 dasd_nopav = 1; 245 pr_info("PAV support has be deactivated\n"); 246 } 247 return 0; 248 } 249 if (strncmp("nofcx", keyword, length) == 0) { 250 dasd_nofcx = 1; 251 pr_info("High Performance FICON support has been " 252 "deactivated\n"); 253 return 0; 254 } 255 if (strncmp("fixedbuffers", keyword, length) == 0) { 256 if (dasd_page_cache) 257 return 0; 258 dasd_page_cache = 259 kmem_cache_create("dasd_page_cache", PAGE_SIZE, 260 PAGE_SIZE, SLAB_CACHE_DMA, 261 NULL); 262 if (!dasd_page_cache) 263 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, " 264 "fixed buffer mode disabled."); 265 else 266 DBF_EVENT(DBF_INFO, "%s", 267 "turning on fixed buffer mode"); 268 return 0; 269 } 270 271 return -EINVAL; 272 } 273 274 /* 275 * Split a string of a device range into its pieces and return the from, to, and 276 * feature parts separately. 277 * e.g.: 278 * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog 279 * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw 280 * 0x4321 -> from: 0x4321 to: null features: null 281 */ 282 static int __init dasd_evaluate_range_param(char *range, char **from_str, 283 char **to_str, char **features_str) 284 { 285 int rc = 0; 286 287 /* Do we have a range or a single device? */ 288 if (strchr(range, '-')) { 289 *from_str = strsep(&range, "-"); 290 *to_str = strsep(&range, "("); 291 *features_str = strsep(&range, ")"); 292 } else { 293 *from_str = strsep(&range, "("); 294 *features_str = strsep(&range, ")"); 295 } 296 297 if (*features_str && !range) { 298 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n"); 299 rc = -EINVAL; 300 } 301 302 return rc; 303 } 304 305 /* 306 * Try to interprete the range string as a device number or a range of devices. 307 * If the interpretation is successful, create the matching dasd_devmap entries. 308 * If interpretation fails or in case of an error, return an error code. 309 */ 310 static int __init dasd_parse_range(const char *range) 311 { 312 struct dasd_devmap *devmap; 313 int from, from_id0, from_id1; 314 int to, to_id0, to_id1; 315 int features; 316 char bus_id[DASD_BUS_ID_SIZE + 1]; 317 char *features_str = NULL; 318 char *from_str = NULL; 319 char *to_str = NULL; 320 int rc = 0; 321 char *tmp; 322 323 tmp = kstrdup(range, GFP_KERNEL); 324 if (!tmp) 325 return -ENOMEM; 326 327 if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) { 328 rc = -EINVAL; 329 goto out; 330 } 331 332 if (dasd_busid(from_str, &from_id0, &from_id1, &from)) { 333 rc = -EINVAL; 334 goto out; 335 } 336 337 to = from; 338 to_id0 = from_id0; 339 to_id1 = from_id1; 340 if (to_str) { 341 if (dasd_busid(to_str, &to_id0, &to_id1, &to)) { 342 rc = -EINVAL; 343 goto out; 344 } 345 if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) { 346 pr_err("%s is not a valid device range\n", range); 347 rc = -EINVAL; 348 goto out; 349 } 350 } 351 352 features = dasd_feature_list(features_str); 353 if (features < 0) { 354 rc = -EINVAL; 355 goto out; 356 } 357 /* each device in dasd= parameter should be set initially online */ 358 features |= DASD_FEATURE_INITIAL_ONLINE; 359 while (from <= to) { 360 sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++); 361 devmap = dasd_add_busid(bus_id, features); 362 if (IS_ERR(devmap)) { 363 rc = PTR_ERR(devmap); 364 goto out; 365 } 366 } 367 368 out: 369 kfree(tmp); 370 371 return rc; 372 } 373 374 /* 375 * Parse parameters stored in dasd[] 376 * The 'dasd=...' parameter allows to specify a comma separated list of 377 * keywords and device ranges. The parameters in that list will be stored as 378 * separate elementes in dasd[]. 379 */ 380 int __init dasd_parse(void) 381 { 382 int rc, i; 383 char *cur; 384 385 rc = 0; 386 for (i = 0; i < DASD_MAX_PARAMS; i++) { 387 cur = dasd[i]; 388 if (!cur) 389 break; 390 if (*cur == '\0') 391 continue; 392 393 rc = dasd_parse_keyword(cur); 394 if (rc) 395 rc = dasd_parse_range(cur); 396 397 if (rc) 398 break; 399 } 400 401 return rc; 402 } 403 404 /* 405 * Add a devmap for the device specified by busid. It is possible that 406 * the devmap already exists (dasd= parameter). The order of the devices 407 * added through this function will define the kdevs for the individual 408 * devices. 409 */ 410 static struct dasd_devmap * 411 dasd_add_busid(const char *bus_id, int features) 412 { 413 struct dasd_devmap *devmap, *new, *tmp; 414 int hash; 415 416 new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); 417 if (!new) 418 return ERR_PTR(-ENOMEM); 419 spin_lock(&dasd_devmap_lock); 420 devmap = NULL; 421 hash = dasd_hash_busid(bus_id); 422 list_for_each_entry(tmp, &dasd_hashlists[hash], list) 423 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { 424 devmap = tmp; 425 break; 426 } 427 if (!devmap) { 428 /* This bus_id is new. */ 429 new->devindex = dasd_max_devindex++; 430 strscpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); 431 new->features = features; 432 new->device = NULL; 433 list_add(&new->list, &dasd_hashlists[hash]); 434 devmap = new; 435 new = NULL; 436 } 437 spin_unlock(&dasd_devmap_lock); 438 kfree(new); 439 return devmap; 440 } 441 442 static struct dasd_devmap * 443 dasd_find_busid_locked(const char *bus_id) 444 { 445 struct dasd_devmap *devmap, *tmp; 446 int hash; 447 448 devmap = ERR_PTR(-ENODEV); 449 hash = dasd_hash_busid(bus_id); 450 list_for_each_entry(tmp, &dasd_hashlists[hash], list) { 451 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { 452 devmap = tmp; 453 break; 454 } 455 } 456 return devmap; 457 } 458 459 /* 460 * Find devmap for device with given bus_id. 461 */ 462 static struct dasd_devmap * 463 dasd_find_busid(const char *bus_id) 464 { 465 struct dasd_devmap *devmap; 466 467 spin_lock(&dasd_devmap_lock); 468 devmap = dasd_find_busid_locked(bus_id); 469 spin_unlock(&dasd_devmap_lock); 470 return devmap; 471 } 472 473 /* 474 * Check if busid has been added to the list of dasd ranges. 475 */ 476 int 477 dasd_busid_known(const char *bus_id) 478 { 479 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; 480 } 481 482 /* 483 * Forget all about the device numbers added so far. 484 * This may only be called at module unload or system shutdown. 485 */ 486 static void 487 dasd_forget_ranges(void) 488 { 489 struct dasd_devmap *devmap, *n; 490 int i; 491 492 spin_lock(&dasd_devmap_lock); 493 for (i = 0; i < 256; i++) { 494 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { 495 BUG_ON(devmap->device != NULL); 496 list_del(&devmap->list); 497 kfree(devmap); 498 } 499 } 500 spin_unlock(&dasd_devmap_lock); 501 } 502 503 /* 504 * Find the device struct by its device index. 505 */ 506 struct dasd_device * 507 dasd_device_from_devindex(int devindex) 508 { 509 struct dasd_devmap *devmap, *tmp; 510 struct dasd_device *device; 511 int i; 512 513 spin_lock(&dasd_devmap_lock); 514 devmap = NULL; 515 for (i = 0; (i < 256) && !devmap; i++) 516 list_for_each_entry(tmp, &dasd_hashlists[i], list) 517 if (tmp->devindex == devindex) { 518 /* Found the devmap for the device. */ 519 devmap = tmp; 520 break; 521 } 522 if (devmap && devmap->device) { 523 device = devmap->device; 524 dasd_get_device(device); 525 } else 526 device = ERR_PTR(-ENODEV); 527 spin_unlock(&dasd_devmap_lock); 528 return device; 529 } 530 531 /* 532 * Return devmap for cdev. If no devmap exists yet, create one and 533 * connect it to the cdev. 534 */ 535 static struct dasd_devmap * 536 dasd_devmap_from_cdev(struct ccw_device *cdev) 537 { 538 struct dasd_devmap *devmap; 539 540 devmap = dasd_find_busid(dev_name(&cdev->dev)); 541 if (IS_ERR(devmap)) 542 devmap = dasd_add_busid(dev_name(&cdev->dev), 543 DASD_FEATURE_DEFAULT); 544 return devmap; 545 } 546 547 /* 548 * Create a dasd device structure for cdev. 549 */ 550 struct dasd_device * 551 dasd_create_device(struct ccw_device *cdev) 552 { 553 struct dasd_devmap *devmap; 554 struct dasd_device *device; 555 unsigned long flags; 556 int rc; 557 558 devmap = dasd_devmap_from_cdev(cdev); 559 if (IS_ERR(devmap)) 560 return (void *) devmap; 561 562 device = dasd_alloc_device(); 563 if (IS_ERR(device)) 564 return device; 565 atomic_set(&device->ref_count, 3); 566 567 spin_lock(&dasd_devmap_lock); 568 if (!devmap->device) { 569 devmap->device = device; 570 device->devindex = devmap->devindex; 571 device->features = devmap->features; 572 get_device(&cdev->dev); 573 device->cdev = cdev; 574 rc = 0; 575 } else 576 /* Someone else was faster. */ 577 rc = -EBUSY; 578 spin_unlock(&dasd_devmap_lock); 579 580 if (rc) { 581 dasd_free_device(device); 582 return ERR_PTR(rc); 583 } 584 585 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 586 dev_set_drvdata(&cdev->dev, device); 587 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 588 589 device->paths_info = kset_create_and_add("paths_info", NULL, 590 &device->cdev->dev.kobj); 591 if (!device->paths_info) 592 dev_warn(&cdev->dev, "Could not create paths_info kset\n"); 593 594 return device; 595 } 596 597 /* 598 * allocate a PPRC data structure and call the discipline function to fill 599 */ 600 static int dasd_devmap_get_pprc_status(struct dasd_device *device, 601 struct dasd_pprc_data_sc4 **data) 602 { 603 struct dasd_pprc_data_sc4 *temp; 604 605 if (!device->discipline || !device->discipline->pprc_status) { 606 dev_warn(&device->cdev->dev, "Unable to query copy relation status\n"); 607 return -EOPNOTSUPP; 608 } 609 temp = kzalloc(sizeof(*temp), GFP_KERNEL); 610 if (!temp) 611 return -ENOMEM; 612 613 /* get PPRC information from storage */ 614 if (device->discipline->pprc_status(device, temp)) { 615 dev_warn(&device->cdev->dev, "Error during copy relation status query\n"); 616 kfree(temp); 617 return -EINVAL; 618 } 619 *data = temp; 620 621 return 0; 622 } 623 624 /* 625 * find an entry in a PPRC device_info array by a given UID 626 * depending on the primary/secondary state of the device it has to be 627 * matched with the respective fields 628 */ 629 static int dasd_devmap_entry_from_pprc_data(struct dasd_pprc_data_sc4 *data, 630 struct dasd_uid uid, 631 bool primary) 632 { 633 int i; 634 635 for (i = 0; i < DASD_CP_ENTRIES; i++) { 636 if (primary) { 637 if (data->dev_info[i].prim_cu_ssid == uid.ssid && 638 data->dev_info[i].primary == uid.real_unit_addr) 639 return i; 640 } else { 641 if (data->dev_info[i].sec_cu_ssid == uid.ssid && 642 data->dev_info[i].secondary == uid.real_unit_addr) 643 return i; 644 } 645 } 646 return -1; 647 } 648 649 /* 650 * check the consistency of a specified copy relation by checking 651 * the following things: 652 * 653 * - is the given device part of a copy pair setup 654 * - does the state of the device match the state in the PPRC status data 655 * - does the device UID match with the UID in the PPRC status data 656 * - to prevent misrouted IO check if the given device is present in all 657 * related PPRC status data 658 */ 659 static int dasd_devmap_check_copy_relation(struct dasd_device *device, 660 struct dasd_copy_entry *entry, 661 struct dasd_pprc_data_sc4 *data, 662 struct dasd_copy_relation *copy) 663 { 664 struct dasd_pprc_data_sc4 *tmp_dat; 665 struct dasd_device *tmp_dev; 666 struct dasd_uid uid; 667 int i, j; 668 669 if (!device->discipline || !device->discipline->get_uid || 670 device->discipline->get_uid(device, &uid)) 671 return 1; 672 673 i = dasd_devmap_entry_from_pprc_data(data, uid, entry->primary); 674 if (i < 0) { 675 dev_warn(&device->cdev->dev, "Device not part of a copy relation\n"); 676 return 1; 677 } 678 679 /* double check which role the current device has */ 680 if (entry->primary) { 681 if (data->dev_info[i].flags & 0x80) { 682 dev_warn(&device->cdev->dev, "Copy pair secondary is setup as primary\n"); 683 return 1; 684 } 685 if (data->dev_info[i].prim_cu_ssid != uid.ssid || 686 data->dev_info[i].primary != uid.real_unit_addr) { 687 dev_warn(&device->cdev->dev, 688 "Primary device %s does not match copy pair status primary device %04x\n", 689 dev_name(&device->cdev->dev), 690 data->dev_info[i].prim_cu_ssid | 691 data->dev_info[i].primary); 692 return 1; 693 } 694 } else { 695 if (!(data->dev_info[i].flags & 0x80)) { 696 dev_warn(&device->cdev->dev, "Copy pair primary is setup as secondary\n"); 697 return 1; 698 } 699 if (data->dev_info[i].sec_cu_ssid != uid.ssid || 700 data->dev_info[i].secondary != uid.real_unit_addr) { 701 dev_warn(&device->cdev->dev, 702 "Secondary device %s does not match copy pair status secondary device %04x\n", 703 dev_name(&device->cdev->dev), 704 data->dev_info[i].sec_cu_ssid | 705 data->dev_info[i].secondary); 706 return 1; 707 } 708 } 709 710 /* 711 * the current device has to be part of the copy relation of all 712 * entries to prevent misrouted IO to another copy pair 713 */ 714 for (j = 0; j < DASD_CP_ENTRIES; j++) { 715 if (entry == ©->entry[j]) 716 tmp_dev = device; 717 else 718 tmp_dev = copy->entry[j].device; 719 720 if (!tmp_dev) 721 continue; 722 723 if (dasd_devmap_get_pprc_status(tmp_dev, &tmp_dat)) 724 return 1; 725 726 if (dasd_devmap_entry_from_pprc_data(tmp_dat, uid, entry->primary) < 0) { 727 dev_warn(&tmp_dev->cdev->dev, 728 "Copy pair relation does not contain device: %s\n", 729 dev_name(&device->cdev->dev)); 730 kfree(tmp_dat); 731 return 1; 732 } 733 kfree(tmp_dat); 734 } 735 return 0; 736 } 737 738 /* delete device from copy relation entry */ 739 static void dasd_devmap_delete_copy_relation_device(struct dasd_device *device) 740 { 741 struct dasd_copy_relation *copy; 742 int i; 743 744 if (!device->copy) 745 return; 746 747 copy = device->copy; 748 for (i = 0; i < DASD_CP_ENTRIES; i++) { 749 if (copy->entry[i].device == device) 750 copy->entry[i].device = NULL; 751 } 752 dasd_put_device(device); 753 device->copy = NULL; 754 } 755 756 /* 757 * read all required information for a copy relation setup and setup the device 758 * accordingly 759 */ 760 int dasd_devmap_set_device_copy_relation(struct ccw_device *cdev, 761 bool pprc_enabled) 762 { 763 struct dasd_pprc_data_sc4 *data = NULL; 764 struct dasd_copy_entry *entry = NULL; 765 struct dasd_copy_relation *copy; 766 struct dasd_devmap *devmap; 767 struct dasd_device *device; 768 int i, rc = 0; 769 770 devmap = dasd_devmap_from_cdev(cdev); 771 if (IS_ERR(devmap)) 772 return PTR_ERR(devmap); 773 774 device = devmap->device; 775 if (!device) 776 return -ENODEV; 777 778 copy = devmap->copy; 779 /* no copy pair setup for this device */ 780 if (!copy) 781 goto out; 782 783 rc = dasd_devmap_get_pprc_status(device, &data); 784 if (rc) 785 return rc; 786 787 /* print error if PPRC is requested but not enabled on storage server */ 788 if (!pprc_enabled) { 789 dev_err(&cdev->dev, "Copy relation not enabled on storage server\n"); 790 rc = -EINVAL; 791 goto out; 792 } 793 794 if (!data->dev_info[0].state) { 795 dev_warn(&device->cdev->dev, "Copy pair setup requested for device not in copy relation\n"); 796 rc = -EINVAL; 797 goto out; 798 } 799 /* find entry */ 800 for (i = 0; i < DASD_CP_ENTRIES; i++) { 801 if (copy->entry[i].configured && 802 strncmp(dev_name(&cdev->dev), 803 copy->entry[i].busid, DASD_BUS_ID_SIZE) == 0) { 804 entry = ©->entry[i]; 805 break; 806 } 807 } 808 if (!entry) { 809 dev_warn(&device->cdev->dev, "Copy relation entry not found\n"); 810 rc = -EINVAL; 811 goto out; 812 } 813 /* check if the copy relation is valid */ 814 if (dasd_devmap_check_copy_relation(device, entry, data, copy)) { 815 dev_warn(&device->cdev->dev, "Copy relation faulty\n"); 816 rc = -EINVAL; 817 goto out; 818 } 819 820 dasd_get_device(device); 821 copy->entry[i].device = device; 822 device->copy = copy; 823 out: 824 kfree(data); 825 return rc; 826 } 827 EXPORT_SYMBOL_GPL(dasd_devmap_set_device_copy_relation); 828 829 /* 830 * Wait queue for dasd_delete_device waits. 831 */ 832 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); 833 834 /* 835 * Remove a dasd device structure. The passed referenced 836 * is destroyed. 837 */ 838 void 839 dasd_delete_device(struct dasd_device *device) 840 { 841 struct ccw_device *cdev; 842 struct dasd_devmap *devmap; 843 unsigned long flags; 844 845 /* First remove device pointer from devmap. */ 846 devmap = dasd_find_busid(dev_name(&device->cdev->dev)); 847 BUG_ON(IS_ERR(devmap)); 848 spin_lock(&dasd_devmap_lock); 849 if (devmap->device != device) { 850 spin_unlock(&dasd_devmap_lock); 851 dasd_put_device(device); 852 return; 853 } 854 devmap->device = NULL; 855 spin_unlock(&dasd_devmap_lock); 856 857 /* Disconnect dasd_device structure from ccw_device structure. */ 858 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 859 dev_set_drvdata(&device->cdev->dev, NULL); 860 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 861 862 /* Removve copy relation */ 863 dasd_devmap_delete_copy_relation_device(device); 864 /* 865 * Drop ref_count by 3, one for the devmap reference, one for 866 * the cdev reference and one for the passed reference. 867 */ 868 atomic_sub(3, &device->ref_count); 869 870 /* Wait for reference counter to drop to zero. */ 871 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); 872 873 dasd_generic_free_discipline(device); 874 875 kset_unregister(device->paths_info); 876 877 /* Disconnect dasd_device structure from ccw_device structure. */ 878 cdev = device->cdev; 879 device->cdev = NULL; 880 881 /* Put ccw_device structure. */ 882 put_device(&cdev->dev); 883 884 /* Now the device structure can be freed. */ 885 dasd_free_device(device); 886 } 887 888 /* 889 * Reference counter dropped to zero. Wake up waiter 890 * in dasd_delete_device. 891 */ 892 void 893 dasd_put_device_wake(struct dasd_device *device) 894 { 895 wake_up(&dasd_delete_wq); 896 } 897 EXPORT_SYMBOL_GPL(dasd_put_device_wake); 898 899 /* 900 * Return dasd_device structure associated with cdev. 901 * This function needs to be called with the ccw device 902 * lock held. It can be used from interrupt context. 903 */ 904 struct dasd_device * 905 dasd_device_from_cdev_locked(struct ccw_device *cdev) 906 { 907 struct dasd_device *device = dev_get_drvdata(&cdev->dev); 908 909 if (!device) 910 return ERR_PTR(-ENODEV); 911 dasd_get_device(device); 912 return device; 913 } 914 915 /* 916 * Return dasd_device structure associated with cdev. 917 */ 918 struct dasd_device * 919 dasd_device_from_cdev(struct ccw_device *cdev) 920 { 921 struct dasd_device *device; 922 unsigned long flags; 923 924 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 925 device = dasd_device_from_cdev_locked(cdev); 926 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 927 return device; 928 } 929 930 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device) 931 { 932 struct dasd_devmap *devmap; 933 934 devmap = dasd_find_busid(dev_name(&device->cdev->dev)); 935 if (IS_ERR(devmap)) 936 return; 937 spin_lock(&dasd_devmap_lock); 938 gdp->private_data = devmap; 939 spin_unlock(&dasd_devmap_lock); 940 } 941 EXPORT_SYMBOL(dasd_add_link_to_gendisk); 942 943 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp) 944 { 945 struct dasd_device *device; 946 struct dasd_devmap *devmap; 947 948 if (!gdp->private_data) 949 return NULL; 950 device = NULL; 951 spin_lock(&dasd_devmap_lock); 952 devmap = gdp->private_data; 953 if (devmap && devmap->device) { 954 device = devmap->device; 955 dasd_get_device(device); 956 } 957 spin_unlock(&dasd_devmap_lock); 958 return device; 959 } 960 961 /* 962 * SECTION: files in sysfs 963 */ 964 965 /* 966 * failfast controls the behaviour, if no path is available 967 */ 968 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr, 969 char *buf) 970 { 971 struct dasd_devmap *devmap; 972 int ff_flag; 973 974 devmap = dasd_find_busid(dev_name(dev)); 975 if (!IS_ERR(devmap)) 976 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0; 977 else 978 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0; 979 return sysfs_emit(buf, ff_flag ? "1\n" : "0\n"); 980 } 981 982 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr, 983 const char *buf, size_t count) 984 { 985 unsigned int val; 986 int rc; 987 988 if (kstrtouint(buf, 0, &val) || val > 1) 989 return -EINVAL; 990 991 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val); 992 993 return rc ? : count; 994 } 995 996 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store); 997 998 /* 999 * readonly controls the readonly status of a dasd 1000 */ 1001 static ssize_t 1002 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) 1003 { 1004 struct dasd_devmap *devmap; 1005 struct dasd_device *device; 1006 int ro_flag = 0; 1007 1008 devmap = dasd_find_busid(dev_name(dev)); 1009 if (IS_ERR(devmap)) 1010 goto out; 1011 1012 ro_flag = !!(devmap->features & DASD_FEATURE_READONLY); 1013 1014 spin_lock(&dasd_devmap_lock); 1015 device = devmap->device; 1016 if (device) 1017 ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags); 1018 spin_unlock(&dasd_devmap_lock); 1019 1020 out: 1021 return sysfs_emit(buf, ro_flag ? "1\n" : "0\n"); 1022 } 1023 1024 static ssize_t 1025 dasd_ro_store(struct device *dev, struct device_attribute *attr, 1026 const char *buf, size_t count) 1027 { 1028 struct ccw_device *cdev = to_ccwdev(dev); 1029 struct dasd_device *device; 1030 unsigned long flags; 1031 unsigned int val; 1032 int rc; 1033 1034 if (kstrtouint(buf, 0, &val) || val > 1) 1035 return -EINVAL; 1036 1037 rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val); 1038 if (rc) 1039 return rc; 1040 1041 device = dasd_device_from_cdev(cdev); 1042 if (IS_ERR(device)) 1043 return count; 1044 1045 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1046 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags); 1047 1048 if (!device->block || !device->block->gdp || 1049 test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 1050 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1051 goto out; 1052 } 1053 /* Increase open_count to avoid losing the block device */ 1054 atomic_inc(&device->block->open_count); 1055 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1056 1057 set_disk_ro(device->block->gdp, val); 1058 atomic_dec(&device->block->open_count); 1059 1060 out: 1061 dasd_put_device(device); 1062 1063 return count; 1064 } 1065 1066 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); 1067 /* 1068 * erplog controls the logging of ERP related data 1069 * (e.g. failing channel programs). 1070 */ 1071 static ssize_t 1072 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) 1073 { 1074 struct dasd_devmap *devmap; 1075 int erplog; 1076 1077 devmap = dasd_find_busid(dev_name(dev)); 1078 if (!IS_ERR(devmap)) 1079 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; 1080 else 1081 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; 1082 return sysfs_emit(buf, erplog ? "1\n" : "0\n"); 1083 } 1084 1085 static ssize_t 1086 dasd_erplog_store(struct device *dev, struct device_attribute *attr, 1087 const char *buf, size_t count) 1088 { 1089 unsigned int val; 1090 int rc; 1091 1092 if (kstrtouint(buf, 0, &val) || val > 1) 1093 return -EINVAL; 1094 1095 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val); 1096 1097 return rc ? : count; 1098 } 1099 1100 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store); 1101 1102 /* 1103 * use_diag controls whether the driver should use diag rather than ssch 1104 * to talk to the device 1105 */ 1106 static ssize_t 1107 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) 1108 { 1109 struct dasd_devmap *devmap; 1110 int use_diag; 1111 1112 devmap = dasd_find_busid(dev_name(dev)); 1113 if (!IS_ERR(devmap)) 1114 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; 1115 else 1116 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; 1117 return sprintf(buf, use_diag ? "1\n" : "0\n"); 1118 } 1119 1120 static ssize_t 1121 dasd_use_diag_store(struct device *dev, struct device_attribute *attr, 1122 const char *buf, size_t count) 1123 { 1124 struct dasd_devmap *devmap; 1125 unsigned int val; 1126 ssize_t rc; 1127 1128 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 1129 if (IS_ERR(devmap)) 1130 return PTR_ERR(devmap); 1131 1132 if (kstrtouint(buf, 0, &val) || val > 1) 1133 return -EINVAL; 1134 1135 spin_lock(&dasd_devmap_lock); 1136 /* Changing diag discipline flag is only allowed in offline state. */ 1137 rc = count; 1138 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) { 1139 if (val) 1140 devmap->features |= DASD_FEATURE_USEDIAG; 1141 else 1142 devmap->features &= ~DASD_FEATURE_USEDIAG; 1143 } else 1144 rc = -EPERM; 1145 spin_unlock(&dasd_devmap_lock); 1146 return rc; 1147 } 1148 1149 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); 1150 1151 /* 1152 * use_raw controls whether the driver should give access to raw eckd data or 1153 * operate in standard mode 1154 */ 1155 static ssize_t 1156 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf) 1157 { 1158 struct dasd_devmap *devmap; 1159 int use_raw; 1160 1161 devmap = dasd_find_busid(dev_name(dev)); 1162 if (!IS_ERR(devmap)) 1163 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0; 1164 else 1165 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0; 1166 return sprintf(buf, use_raw ? "1\n" : "0\n"); 1167 } 1168 1169 static ssize_t 1170 dasd_use_raw_store(struct device *dev, struct device_attribute *attr, 1171 const char *buf, size_t count) 1172 { 1173 struct dasd_devmap *devmap; 1174 ssize_t rc; 1175 unsigned long val; 1176 1177 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 1178 if (IS_ERR(devmap)) 1179 return PTR_ERR(devmap); 1180 1181 if ((kstrtoul(buf, 10, &val) != 0) || val > 1) 1182 return -EINVAL; 1183 1184 spin_lock(&dasd_devmap_lock); 1185 /* Changing diag discipline flag is only allowed in offline state. */ 1186 rc = count; 1187 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) { 1188 if (val) 1189 devmap->features |= DASD_FEATURE_USERAW; 1190 else 1191 devmap->features &= ~DASD_FEATURE_USERAW; 1192 } else 1193 rc = -EPERM; 1194 spin_unlock(&dasd_devmap_lock); 1195 return rc; 1196 } 1197 1198 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show, 1199 dasd_use_raw_store); 1200 1201 static ssize_t 1202 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr, 1203 const char *buf, size_t count) 1204 { 1205 struct ccw_device *cdev = to_ccwdev(dev); 1206 struct dasd_device *device; 1207 unsigned long flags; 1208 int rc; 1209 1210 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 1211 device = dasd_device_from_cdev_locked(cdev); 1212 if (IS_ERR(device)) { 1213 rc = PTR_ERR(device); 1214 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1215 goto out; 1216 } 1217 1218 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || 1219 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 1220 /* Already doing offline processing */ 1221 dasd_put_device(device); 1222 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1223 rc = -EBUSY; 1224 goto out; 1225 } 1226 1227 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); 1228 dasd_put_device(device); 1229 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 1230 1231 rc = ccw_device_set_offline(cdev); 1232 1233 out: 1234 return rc ? rc : count; 1235 } 1236 1237 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store); 1238 1239 static ssize_t 1240 dasd_access_show(struct device *dev, struct device_attribute *attr, 1241 char *buf) 1242 { 1243 struct ccw_device *cdev = to_ccwdev(dev); 1244 struct dasd_device *device; 1245 int count; 1246 1247 device = dasd_device_from_cdev(cdev); 1248 if (IS_ERR(device)) 1249 return PTR_ERR(device); 1250 1251 if (!device->discipline) 1252 count = -ENODEV; 1253 else if (!device->discipline->host_access_count) 1254 count = -EOPNOTSUPP; 1255 else 1256 count = device->discipline->host_access_count(device); 1257 1258 dasd_put_device(device); 1259 if (count < 0) 1260 return count; 1261 1262 return sprintf(buf, "%d\n", count); 1263 } 1264 1265 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL); 1266 1267 static ssize_t 1268 dasd_discipline_show(struct device *dev, struct device_attribute *attr, 1269 char *buf) 1270 { 1271 struct dasd_device *device; 1272 ssize_t len; 1273 1274 device = dasd_device_from_cdev(to_ccwdev(dev)); 1275 if (IS_ERR(device)) 1276 goto out; 1277 else if (!device->discipline) { 1278 dasd_put_device(device); 1279 goto out; 1280 } else { 1281 len = sysfs_emit(buf, "%s\n", 1282 device->discipline->name); 1283 dasd_put_device(device); 1284 return len; 1285 } 1286 out: 1287 len = sysfs_emit(buf, "none\n"); 1288 return len; 1289 } 1290 1291 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); 1292 1293 static ssize_t 1294 dasd_device_status_show(struct device *dev, struct device_attribute *attr, 1295 char *buf) 1296 { 1297 struct dasd_device *device; 1298 ssize_t len; 1299 1300 device = dasd_device_from_cdev(to_ccwdev(dev)); 1301 if (!IS_ERR(device)) { 1302 switch (device->state) { 1303 case DASD_STATE_NEW: 1304 len = sysfs_emit(buf, "new\n"); 1305 break; 1306 case DASD_STATE_KNOWN: 1307 len = sysfs_emit(buf, "detected\n"); 1308 break; 1309 case DASD_STATE_BASIC: 1310 len = sysfs_emit(buf, "basic\n"); 1311 break; 1312 case DASD_STATE_UNFMT: 1313 len = sysfs_emit(buf, "unformatted\n"); 1314 break; 1315 case DASD_STATE_READY: 1316 len = sysfs_emit(buf, "ready\n"); 1317 break; 1318 case DASD_STATE_ONLINE: 1319 len = sysfs_emit(buf, "online\n"); 1320 break; 1321 default: 1322 len = sysfs_emit(buf, "no stat\n"); 1323 break; 1324 } 1325 dasd_put_device(device); 1326 } else 1327 len = sysfs_emit(buf, "unknown\n"); 1328 return len; 1329 } 1330 1331 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL); 1332 1333 static ssize_t dasd_alias_show(struct device *dev, 1334 struct device_attribute *attr, char *buf) 1335 { 1336 struct dasd_device *device; 1337 struct dasd_uid uid; 1338 1339 device = dasd_device_from_cdev(to_ccwdev(dev)); 1340 if (IS_ERR(device)) 1341 return sprintf(buf, "0\n"); 1342 1343 if (device->discipline && device->discipline->get_uid && 1344 !device->discipline->get_uid(device, &uid)) { 1345 if (uid.type == UA_BASE_PAV_ALIAS || 1346 uid.type == UA_HYPER_PAV_ALIAS) { 1347 dasd_put_device(device); 1348 return sprintf(buf, "1\n"); 1349 } 1350 } 1351 dasd_put_device(device); 1352 1353 return sprintf(buf, "0\n"); 1354 } 1355 1356 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); 1357 1358 static ssize_t dasd_vendor_show(struct device *dev, 1359 struct device_attribute *attr, char *buf) 1360 { 1361 struct dasd_device *device; 1362 struct dasd_uid uid; 1363 char *vendor; 1364 1365 device = dasd_device_from_cdev(to_ccwdev(dev)); 1366 vendor = ""; 1367 if (IS_ERR(device)) 1368 return sysfs_emit(buf, "%s\n", vendor); 1369 1370 if (device->discipline && device->discipline->get_uid && 1371 !device->discipline->get_uid(device, &uid)) 1372 vendor = uid.vendor; 1373 1374 dasd_put_device(device); 1375 1376 return sysfs_emit(buf, "%s\n", vendor); 1377 } 1378 1379 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); 1380 1381 static ssize_t 1382 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) 1383 { 1384 char uid_string[DASD_UID_STRLEN]; 1385 struct dasd_device *device; 1386 struct dasd_uid uid; 1387 char ua_string[3]; 1388 1389 device = dasd_device_from_cdev(to_ccwdev(dev)); 1390 uid_string[0] = 0; 1391 if (IS_ERR(device)) 1392 return sysfs_emit(buf, "%s\n", uid_string); 1393 1394 if (device->discipline && device->discipline->get_uid && 1395 !device->discipline->get_uid(device, &uid)) { 1396 switch (uid.type) { 1397 case UA_BASE_DEVICE: 1398 snprintf(ua_string, sizeof(ua_string), "%02x", 1399 uid.real_unit_addr); 1400 break; 1401 case UA_BASE_PAV_ALIAS: 1402 snprintf(ua_string, sizeof(ua_string), "%02x", 1403 uid.base_unit_addr); 1404 break; 1405 case UA_HYPER_PAV_ALIAS: 1406 snprintf(ua_string, sizeof(ua_string), "xx"); 1407 break; 1408 default: 1409 /* should not happen, treat like base device */ 1410 snprintf(ua_string, sizeof(ua_string), "%02x", 1411 uid.real_unit_addr); 1412 break; 1413 } 1414 1415 if (strlen(uid.vduit) > 0) 1416 snprintf(uid_string, sizeof(uid_string), 1417 "%s.%s.%04x.%s.%s", 1418 uid.vendor, uid.serial, uid.ssid, ua_string, 1419 uid.vduit); 1420 else 1421 snprintf(uid_string, sizeof(uid_string), 1422 "%s.%s.%04x.%s", 1423 uid.vendor, uid.serial, uid.ssid, ua_string); 1424 } 1425 dasd_put_device(device); 1426 1427 return sysfs_emit(buf, "%s\n", uid_string); 1428 } 1429 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); 1430 1431 /* 1432 * extended error-reporting 1433 */ 1434 static ssize_t 1435 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) 1436 { 1437 struct dasd_devmap *devmap; 1438 int eer_flag; 1439 1440 devmap = dasd_find_busid(dev_name(dev)); 1441 if (!IS_ERR(devmap) && devmap->device) 1442 eer_flag = dasd_eer_enabled(devmap->device); 1443 else 1444 eer_flag = 0; 1445 return sysfs_emit(buf, eer_flag ? "1\n" : "0\n"); 1446 } 1447 1448 static ssize_t 1449 dasd_eer_store(struct device *dev, struct device_attribute *attr, 1450 const char *buf, size_t count) 1451 { 1452 struct dasd_device *device; 1453 unsigned int val; 1454 int rc = 0; 1455 1456 device = dasd_device_from_cdev(to_ccwdev(dev)); 1457 if (IS_ERR(device)) 1458 return PTR_ERR(device); 1459 1460 if (kstrtouint(buf, 0, &val) || val > 1) 1461 return -EINVAL; 1462 1463 if (val) 1464 rc = dasd_eer_enable(device); 1465 else 1466 dasd_eer_disable(device); 1467 1468 dasd_put_device(device); 1469 1470 return rc ? : count; 1471 } 1472 1473 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); 1474 1475 /* 1476 * aq_mask controls if the DASD should be quiesced on certain triggers 1477 * The aq_mask attribute is interpreted as bitmap of the DASD_EER_* triggers. 1478 */ 1479 static ssize_t dasd_aq_mask_show(struct device *dev, struct device_attribute *attr, 1480 char *buf) 1481 { 1482 struct dasd_devmap *devmap; 1483 unsigned int aq_mask = 0; 1484 1485 devmap = dasd_find_busid(dev_name(dev)); 1486 if (!IS_ERR(devmap)) 1487 aq_mask = devmap->aq_mask; 1488 1489 return sysfs_emit(buf, "%d\n", aq_mask); 1490 } 1491 1492 static ssize_t dasd_aq_mask_store(struct device *dev, struct device_attribute *attr, 1493 const char *buf, size_t count) 1494 { 1495 struct dasd_devmap *devmap; 1496 unsigned int val; 1497 1498 if (kstrtouint(buf, 0, &val) || val > DASD_EER_VALID) 1499 return -EINVAL; 1500 1501 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 1502 if (IS_ERR(devmap)) 1503 return PTR_ERR(devmap); 1504 1505 spin_lock(&dasd_devmap_lock); 1506 devmap->aq_mask = val; 1507 if (devmap->device) 1508 devmap->device->aq_mask = devmap->aq_mask; 1509 spin_unlock(&dasd_devmap_lock); 1510 1511 return count; 1512 } 1513 1514 static DEVICE_ATTR(aq_mask, 0644, dasd_aq_mask_show, dasd_aq_mask_store); 1515 1516 /* 1517 * aq_requeue controls if requests are returned to the blocklayer on quiesce 1518 * or if requests are only not started 1519 */ 1520 static ssize_t dasd_aqr_show(struct device *dev, struct device_attribute *attr, 1521 char *buf) 1522 { 1523 struct dasd_devmap *devmap; 1524 int flag; 1525 1526 devmap = dasd_find_busid(dev_name(dev)); 1527 if (!IS_ERR(devmap)) 1528 flag = (devmap->features & DASD_FEATURE_REQUEUEQUIESCE) != 0; 1529 else 1530 flag = (DASD_FEATURE_DEFAULT & 1531 DASD_FEATURE_REQUEUEQUIESCE) != 0; 1532 return sysfs_emit(buf, "%d\n", flag); 1533 } 1534 1535 static ssize_t dasd_aqr_store(struct device *dev, struct device_attribute *attr, 1536 const char *buf, size_t count) 1537 { 1538 bool val; 1539 int rc; 1540 1541 if (kstrtobool(buf, &val)) 1542 return -EINVAL; 1543 1544 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_REQUEUEQUIESCE, val); 1545 1546 return rc ? : count; 1547 } 1548 1549 static DEVICE_ATTR(aq_requeue, 0644, dasd_aqr_show, dasd_aqr_store); 1550 1551 /* 1552 * aq_timeouts controls how much retries have to time out until 1553 * a device gets autoquiesced 1554 */ 1555 static ssize_t 1556 dasd_aq_timeouts_show(struct device *dev, struct device_attribute *attr, 1557 char *buf) 1558 { 1559 struct dasd_device *device; 1560 int len; 1561 1562 device = dasd_device_from_cdev(to_ccwdev(dev)); 1563 if (IS_ERR(device)) 1564 return -ENODEV; 1565 len = sysfs_emit(buf, "%u\n", device->aq_timeouts); 1566 dasd_put_device(device); 1567 return len; 1568 } 1569 1570 static ssize_t 1571 dasd_aq_timeouts_store(struct device *dev, struct device_attribute *attr, 1572 const char *buf, size_t count) 1573 { 1574 struct dasd_device *device; 1575 unsigned int val; 1576 1577 device = dasd_device_from_cdev(to_ccwdev(dev)); 1578 if (IS_ERR(device)) 1579 return -ENODEV; 1580 1581 if ((kstrtouint(buf, 10, &val) != 0) || 1582 val > DASD_RETRIES_MAX || val == 0) { 1583 dasd_put_device(device); 1584 return -EINVAL; 1585 } 1586 1587 if (val) 1588 device->aq_timeouts = val; 1589 1590 dasd_put_device(device); 1591 return count; 1592 } 1593 1594 static DEVICE_ATTR(aq_timeouts, 0644, dasd_aq_timeouts_show, 1595 dasd_aq_timeouts_store); 1596 1597 /* 1598 * expiration time for default requests 1599 */ 1600 static ssize_t 1601 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf) 1602 { 1603 struct dasd_device *device; 1604 int len; 1605 1606 device = dasd_device_from_cdev(to_ccwdev(dev)); 1607 if (IS_ERR(device)) 1608 return -ENODEV; 1609 len = sysfs_emit(buf, "%lu\n", device->default_expires); 1610 dasd_put_device(device); 1611 return len; 1612 } 1613 1614 static ssize_t 1615 dasd_expires_store(struct device *dev, struct device_attribute *attr, 1616 const char *buf, size_t count) 1617 { 1618 struct dasd_device *device; 1619 unsigned long val; 1620 1621 device = dasd_device_from_cdev(to_ccwdev(dev)); 1622 if (IS_ERR(device)) 1623 return -ENODEV; 1624 1625 if ((kstrtoul(buf, 10, &val) != 0) || 1626 (val > DASD_EXPIRES_MAX) || val == 0) { 1627 dasd_put_device(device); 1628 return -EINVAL; 1629 } 1630 1631 if (val) 1632 device->default_expires = val; 1633 1634 dasd_put_device(device); 1635 return count; 1636 } 1637 1638 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); 1639 1640 static ssize_t 1641 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) 1642 { 1643 struct dasd_device *device; 1644 int len; 1645 1646 device = dasd_device_from_cdev(to_ccwdev(dev)); 1647 if (IS_ERR(device)) 1648 return -ENODEV; 1649 len = sysfs_emit(buf, "%lu\n", device->default_retries); 1650 dasd_put_device(device); 1651 return len; 1652 } 1653 1654 static ssize_t 1655 dasd_retries_store(struct device *dev, struct device_attribute *attr, 1656 const char *buf, size_t count) 1657 { 1658 struct dasd_device *device; 1659 unsigned long val; 1660 1661 device = dasd_device_from_cdev(to_ccwdev(dev)); 1662 if (IS_ERR(device)) 1663 return -ENODEV; 1664 1665 if ((kstrtoul(buf, 10, &val) != 0) || 1666 (val > DASD_RETRIES_MAX)) { 1667 dasd_put_device(device); 1668 return -EINVAL; 1669 } 1670 1671 if (val) 1672 device->default_retries = val; 1673 1674 dasd_put_device(device); 1675 return count; 1676 } 1677 1678 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); 1679 1680 static ssize_t 1681 dasd_timeout_show(struct device *dev, struct device_attribute *attr, 1682 char *buf) 1683 { 1684 struct dasd_device *device; 1685 int len; 1686 1687 device = dasd_device_from_cdev(to_ccwdev(dev)); 1688 if (IS_ERR(device)) 1689 return -ENODEV; 1690 len = sysfs_emit(buf, "%lu\n", device->blk_timeout); 1691 dasd_put_device(device); 1692 return len; 1693 } 1694 1695 static ssize_t 1696 dasd_timeout_store(struct device *dev, struct device_attribute *attr, 1697 const char *buf, size_t count) 1698 { 1699 struct dasd_device *device; 1700 unsigned long val; 1701 1702 device = dasd_device_from_cdev(to_ccwdev(dev)); 1703 if (IS_ERR(device) || !device->block) 1704 return -ENODEV; 1705 1706 if ((kstrtoul(buf, 10, &val) != 0) || 1707 val > UINT_MAX / HZ) { 1708 dasd_put_device(device); 1709 return -EINVAL; 1710 } 1711 if (!device->block->gdp) { 1712 dasd_put_device(device); 1713 return -ENODEV; 1714 } 1715 1716 device->blk_timeout = val; 1717 blk_queue_rq_timeout(device->block->gdp->queue, val * HZ); 1718 1719 dasd_put_device(device); 1720 return count; 1721 } 1722 1723 static DEVICE_ATTR(timeout, 0644, 1724 dasd_timeout_show, dasd_timeout_store); 1725 1726 1727 static ssize_t 1728 dasd_path_reset_store(struct device *dev, struct device_attribute *attr, 1729 const char *buf, size_t count) 1730 { 1731 struct dasd_device *device; 1732 unsigned int val; 1733 1734 device = dasd_device_from_cdev(to_ccwdev(dev)); 1735 if (IS_ERR(device)) 1736 return -ENODEV; 1737 1738 if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff) 1739 val = 0; 1740 1741 if (device->discipline && device->discipline->reset_path) 1742 device->discipline->reset_path(device, (__u8) val); 1743 1744 dasd_put_device(device); 1745 return count; 1746 } 1747 1748 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store); 1749 1750 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr, 1751 char *buf) 1752 { 1753 struct dasd_device *device; 1754 int hpf; 1755 1756 device = dasd_device_from_cdev(to_ccwdev(dev)); 1757 if (IS_ERR(device)) 1758 return -ENODEV; 1759 if (!device->discipline || !device->discipline->hpf_enabled) { 1760 dasd_put_device(device); 1761 return sysfs_emit(buf, "%d\n", dasd_nofcx); 1762 } 1763 hpf = device->discipline->hpf_enabled(device); 1764 dasd_put_device(device); 1765 return sysfs_emit(buf, "%d\n", hpf); 1766 } 1767 1768 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL); 1769 1770 static ssize_t dasd_reservation_policy_show(struct device *dev, 1771 struct device_attribute *attr, 1772 char *buf) 1773 { 1774 struct dasd_devmap *devmap; 1775 int rc = 0; 1776 1777 devmap = dasd_find_busid(dev_name(dev)); 1778 if (IS_ERR(devmap)) { 1779 rc = sysfs_emit(buf, "ignore\n"); 1780 } else { 1781 spin_lock(&dasd_devmap_lock); 1782 if (devmap->features & DASD_FEATURE_FAILONSLCK) 1783 rc = sysfs_emit(buf, "fail\n"); 1784 else 1785 rc = sysfs_emit(buf, "ignore\n"); 1786 spin_unlock(&dasd_devmap_lock); 1787 } 1788 return rc; 1789 } 1790 1791 static ssize_t dasd_reservation_policy_store(struct device *dev, 1792 struct device_attribute *attr, 1793 const char *buf, size_t count) 1794 { 1795 struct ccw_device *cdev = to_ccwdev(dev); 1796 int rc; 1797 1798 if (sysfs_streq("ignore", buf)) 1799 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0); 1800 else if (sysfs_streq("fail", buf)) 1801 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1); 1802 else 1803 rc = -EINVAL; 1804 1805 return rc ? : count; 1806 } 1807 1808 static DEVICE_ATTR(reservation_policy, 0644, 1809 dasd_reservation_policy_show, dasd_reservation_policy_store); 1810 1811 static ssize_t dasd_reservation_state_show(struct device *dev, 1812 struct device_attribute *attr, 1813 char *buf) 1814 { 1815 struct dasd_device *device; 1816 int rc = 0; 1817 1818 device = dasd_device_from_cdev(to_ccwdev(dev)); 1819 if (IS_ERR(device)) 1820 return sysfs_emit(buf, "none\n"); 1821 1822 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) 1823 rc = sysfs_emit(buf, "reserved\n"); 1824 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) 1825 rc = sysfs_emit(buf, "lost\n"); 1826 else 1827 rc = sysfs_emit(buf, "none\n"); 1828 dasd_put_device(device); 1829 return rc; 1830 } 1831 1832 static ssize_t dasd_reservation_state_store(struct device *dev, 1833 struct device_attribute *attr, 1834 const char *buf, size_t count) 1835 { 1836 struct dasd_device *device; 1837 int rc = 0; 1838 1839 device = dasd_device_from_cdev(to_ccwdev(dev)); 1840 if (IS_ERR(device)) 1841 return -ENODEV; 1842 if (sysfs_streq("reset", buf)) 1843 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags); 1844 else 1845 rc = -EINVAL; 1846 dasd_put_device(device); 1847 1848 if (rc) 1849 return rc; 1850 else 1851 return count; 1852 } 1853 1854 static DEVICE_ATTR(last_known_reservation_state, 0644, 1855 dasd_reservation_state_show, dasd_reservation_state_store); 1856 1857 static ssize_t dasd_pm_show(struct device *dev, 1858 struct device_attribute *attr, char *buf) 1859 { 1860 struct dasd_device *device; 1861 u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm; 1862 1863 device = dasd_device_from_cdev(to_ccwdev(dev)); 1864 if (IS_ERR(device)) 1865 return sprintf(buf, "0\n"); 1866 1867 opm = dasd_path_get_opm(device); 1868 nppm = dasd_path_get_nppm(device); 1869 cablepm = dasd_path_get_cablepm(device); 1870 cuirpm = dasd_path_get_cuirpm(device); 1871 hpfpm = dasd_path_get_hpfpm(device); 1872 ifccpm = dasd_path_get_ifccpm(device); 1873 dasd_put_device(device); 1874 1875 return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm, 1876 cablepm, cuirpm, hpfpm, ifccpm); 1877 } 1878 1879 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL); 1880 1881 /* 1882 * threshold value for IFCC/CCC errors 1883 */ 1884 static ssize_t 1885 dasd_path_threshold_show(struct device *dev, 1886 struct device_attribute *attr, char *buf) 1887 { 1888 struct dasd_device *device; 1889 int len; 1890 1891 device = dasd_device_from_cdev(to_ccwdev(dev)); 1892 if (IS_ERR(device)) 1893 return -ENODEV; 1894 len = sysfs_emit(buf, "%lu\n", device->path_thrhld); 1895 dasd_put_device(device); 1896 return len; 1897 } 1898 1899 static ssize_t 1900 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr, 1901 const char *buf, size_t count) 1902 { 1903 struct dasd_device *device; 1904 unsigned long flags; 1905 unsigned long val; 1906 1907 device = dasd_device_from_cdev(to_ccwdev(dev)); 1908 if (IS_ERR(device)) 1909 return -ENODEV; 1910 1911 if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) { 1912 dasd_put_device(device); 1913 return -EINVAL; 1914 } 1915 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); 1916 device->path_thrhld = val; 1917 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); 1918 dasd_put_device(device); 1919 return count; 1920 } 1921 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show, 1922 dasd_path_threshold_store); 1923 1924 /* 1925 * configure if path is disabled after IFCC/CCC error threshold is 1926 * exceeded 1927 */ 1928 static ssize_t 1929 dasd_path_autodisable_show(struct device *dev, 1930 struct device_attribute *attr, char *buf) 1931 { 1932 struct dasd_devmap *devmap; 1933 int flag; 1934 1935 devmap = dasd_find_busid(dev_name(dev)); 1936 if (!IS_ERR(devmap)) 1937 flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0; 1938 else 1939 flag = (DASD_FEATURE_DEFAULT & 1940 DASD_FEATURE_PATH_AUTODISABLE) != 0; 1941 return sysfs_emit(buf, flag ? "1\n" : "0\n"); 1942 } 1943 1944 static ssize_t 1945 dasd_path_autodisable_store(struct device *dev, 1946 struct device_attribute *attr, 1947 const char *buf, size_t count) 1948 { 1949 unsigned int val; 1950 int rc; 1951 1952 if (kstrtouint(buf, 0, &val) || val > 1) 1953 return -EINVAL; 1954 1955 rc = dasd_set_feature(to_ccwdev(dev), 1956 DASD_FEATURE_PATH_AUTODISABLE, val); 1957 1958 return rc ? : count; 1959 } 1960 1961 static DEVICE_ATTR(path_autodisable, 0644, 1962 dasd_path_autodisable_show, 1963 dasd_path_autodisable_store); 1964 /* 1965 * interval for IFCC/CCC checks 1966 * meaning time with no IFCC/CCC error before the error counter 1967 * gets reset 1968 */ 1969 static ssize_t 1970 dasd_path_interval_show(struct device *dev, 1971 struct device_attribute *attr, char *buf) 1972 { 1973 struct dasd_device *device; 1974 int len; 1975 1976 device = dasd_device_from_cdev(to_ccwdev(dev)); 1977 if (IS_ERR(device)) 1978 return -ENODEV; 1979 len = sysfs_emit(buf, "%lu\n", device->path_interval); 1980 dasd_put_device(device); 1981 return len; 1982 } 1983 1984 static ssize_t 1985 dasd_path_interval_store(struct device *dev, struct device_attribute *attr, 1986 const char *buf, size_t count) 1987 { 1988 struct dasd_device *device; 1989 unsigned long flags; 1990 unsigned long val; 1991 1992 device = dasd_device_from_cdev(to_ccwdev(dev)); 1993 if (IS_ERR(device)) 1994 return -ENODEV; 1995 1996 if ((kstrtoul(buf, 10, &val) != 0) || 1997 (val > DASD_INTERVAL_MAX) || val == 0) { 1998 dasd_put_device(device); 1999 return -EINVAL; 2000 } 2001 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); 2002 if (val) 2003 device->path_interval = val; 2004 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); 2005 dasd_put_device(device); 2006 return count; 2007 } 2008 2009 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show, 2010 dasd_path_interval_store); 2011 2012 static ssize_t 2013 dasd_device_fcs_show(struct device *dev, struct device_attribute *attr, 2014 char *buf) 2015 { 2016 struct dasd_device *device; 2017 int fc_sec; 2018 int rc; 2019 2020 device = dasd_device_from_cdev(to_ccwdev(dev)); 2021 if (IS_ERR(device)) 2022 return -ENODEV; 2023 fc_sec = dasd_path_get_fcs_device(device); 2024 if (fc_sec == -EINVAL) 2025 rc = sysfs_emit(buf, "Inconsistent\n"); 2026 else 2027 rc = sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec)); 2028 dasd_put_device(device); 2029 2030 return rc; 2031 } 2032 static DEVICE_ATTR(fc_security, 0444, dasd_device_fcs_show, NULL); 2033 2034 static ssize_t 2035 dasd_path_fcs_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) 2036 { 2037 struct dasd_path *path = to_dasd_path(kobj); 2038 unsigned int fc_sec = path->fc_security; 2039 2040 return sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec)); 2041 } 2042 2043 static struct kobj_attribute path_fcs_attribute = 2044 __ATTR(fc_security, 0444, dasd_path_fcs_show, NULL); 2045 2046 /* 2047 * print copy relation in the form 2048 * primary,secondary[1] primary,secondary[2], ... 2049 */ 2050 static ssize_t 2051 dasd_copy_pair_show(struct device *dev, 2052 struct device_attribute *attr, char *buf) 2053 { 2054 char prim_busid[DASD_BUS_ID_SIZE]; 2055 struct dasd_copy_relation *copy; 2056 struct dasd_devmap *devmap; 2057 int len = 0; 2058 int i; 2059 2060 devmap = dasd_find_busid(dev_name(dev)); 2061 if (IS_ERR(devmap)) 2062 return -ENODEV; 2063 2064 if (!devmap->copy) 2065 return -ENODEV; 2066 2067 copy = devmap->copy; 2068 /* find primary */ 2069 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2070 if (copy->entry[i].configured && copy->entry[i].primary) { 2071 strscpy(prim_busid, copy->entry[i].busid, 2072 DASD_BUS_ID_SIZE); 2073 break; 2074 } 2075 } 2076 if (i == DASD_CP_ENTRIES) 2077 goto out; 2078 2079 /* print all secondary */ 2080 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2081 if (copy->entry[i].configured && !copy->entry[i].primary) 2082 len += sysfs_emit_at(buf, len, "%s,%s ", prim_busid, 2083 copy->entry[i].busid); 2084 } 2085 2086 len += sysfs_emit_at(buf, len, "\n"); 2087 out: 2088 return len; 2089 } 2090 2091 static int dasd_devmap_set_copy_relation(struct dasd_devmap *devmap, 2092 struct dasd_copy_relation *copy, 2093 char *busid, bool primary) 2094 { 2095 int i; 2096 2097 /* find free entry */ 2098 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2099 /* current bus_id already included, nothing to do */ 2100 if (copy->entry[i].configured && 2101 strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0) 2102 return 0; 2103 2104 if (!copy->entry[i].configured) 2105 break; 2106 } 2107 if (i == DASD_CP_ENTRIES) 2108 return -EINVAL; 2109 2110 copy->entry[i].configured = true; 2111 strscpy(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE); 2112 if (primary) { 2113 copy->active = ©->entry[i]; 2114 copy->entry[i].primary = true; 2115 } 2116 if (!devmap->copy) 2117 devmap->copy = copy; 2118 2119 return 0; 2120 } 2121 2122 static void dasd_devmap_del_copy_relation(struct dasd_copy_relation *copy, 2123 char *busid) 2124 { 2125 int i; 2126 2127 spin_lock(&dasd_devmap_lock); 2128 /* find entry */ 2129 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2130 if (copy->entry[i].configured && 2131 strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0) 2132 break; 2133 } 2134 if (i == DASD_CP_ENTRIES || !copy->entry[i].configured) { 2135 spin_unlock(&dasd_devmap_lock); 2136 return; 2137 } 2138 2139 copy->entry[i].configured = false; 2140 memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE); 2141 if (copy->active == ©->entry[i]) { 2142 copy->active = NULL; 2143 copy->entry[i].primary = false; 2144 } 2145 spin_unlock(&dasd_devmap_lock); 2146 } 2147 2148 static int dasd_devmap_clear_copy_relation(struct device *dev) 2149 { 2150 struct dasd_copy_relation *copy; 2151 struct dasd_devmap *devmap; 2152 int i, rc = 1; 2153 2154 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 2155 if (IS_ERR(devmap)) 2156 return 1; 2157 2158 spin_lock(&dasd_devmap_lock); 2159 if (!devmap->copy) 2160 goto out; 2161 2162 copy = devmap->copy; 2163 /* first check if all secondary devices are offline*/ 2164 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2165 if (!copy->entry[i].configured) 2166 continue; 2167 2168 if (copy->entry[i].device == copy->active->device) 2169 continue; 2170 2171 if (copy->entry[i].device) 2172 goto out; 2173 } 2174 /* clear all devmap entries */ 2175 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2176 if (strlen(copy->entry[i].busid) == 0) 2177 continue; 2178 if (copy->entry[i].device) { 2179 dasd_put_device(copy->entry[i].device); 2180 copy->entry[i].device->copy = NULL; 2181 copy->entry[i].device = NULL; 2182 } 2183 devmap = dasd_find_busid_locked(copy->entry[i].busid); 2184 devmap->copy = NULL; 2185 memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE); 2186 } 2187 kfree(copy); 2188 rc = 0; 2189 out: 2190 spin_unlock(&dasd_devmap_lock); 2191 return rc; 2192 } 2193 2194 /* 2195 * parse BUSIDs from a copy pair 2196 */ 2197 static int dasd_devmap_parse_busid(const char *buf, char *prim_busid, 2198 char *sec_busid) 2199 { 2200 char *primary, *secondary, *tmp, *pt; 2201 int id0, id1, id2; 2202 2203 pt = kstrdup(buf, GFP_KERNEL); 2204 tmp = pt; 2205 if (!tmp) 2206 return -ENOMEM; 2207 2208 primary = strsep(&tmp, ","); 2209 if (!primary) { 2210 kfree(pt); 2211 return -EINVAL; 2212 } 2213 secondary = strsep(&tmp, ","); 2214 if (!secondary) { 2215 kfree(pt); 2216 return -EINVAL; 2217 } 2218 if (dasd_busid(primary, &id0, &id1, &id2)) { 2219 kfree(pt); 2220 return -EINVAL; 2221 } 2222 sprintf(prim_busid, "%01x.%01x.%04x", id0, id1, id2); 2223 if (dasd_busid(secondary, &id0, &id1, &id2)) { 2224 kfree(pt); 2225 return -EINVAL; 2226 } 2227 sprintf(sec_busid, "%01x.%01x.%04x", id0, id1, id2); 2228 kfree(pt); 2229 2230 return 0; 2231 } 2232 2233 static ssize_t dasd_copy_pair_store(struct device *dev, 2234 struct device_attribute *attr, 2235 const char *buf, size_t count) 2236 { 2237 struct dasd_devmap *prim_devmap, *sec_devmap; 2238 char prim_busid[DASD_BUS_ID_SIZE]; 2239 char sec_busid[DASD_BUS_ID_SIZE]; 2240 struct dasd_copy_relation *copy; 2241 struct dasd_device *device; 2242 bool pprc_enabled; 2243 int rc; 2244 2245 if (strncmp(buf, "clear", strlen("clear")) == 0) { 2246 if (dasd_devmap_clear_copy_relation(dev)) 2247 return -EINVAL; 2248 return count; 2249 } 2250 2251 rc = dasd_devmap_parse_busid(buf, prim_busid, sec_busid); 2252 if (rc) 2253 return rc; 2254 2255 if (strncmp(dev_name(dev), prim_busid, DASD_BUS_ID_SIZE) != 0 && 2256 strncmp(dev_name(dev), sec_busid, DASD_BUS_ID_SIZE) != 0) 2257 return -EINVAL; 2258 2259 /* allocate primary devmap if needed */ 2260 prim_devmap = dasd_find_busid(prim_busid); 2261 if (IS_ERR(prim_devmap)) { 2262 prim_devmap = dasd_add_busid(prim_busid, DASD_FEATURE_DEFAULT); 2263 if (IS_ERR(prim_devmap)) 2264 return PTR_ERR(prim_devmap); 2265 } 2266 2267 /* allocate secondary devmap if needed */ 2268 sec_devmap = dasd_find_busid(sec_busid); 2269 if (IS_ERR(sec_devmap)) { 2270 sec_devmap = dasd_add_busid(sec_busid, DASD_FEATURE_DEFAULT); 2271 if (IS_ERR(sec_devmap)) 2272 return PTR_ERR(sec_devmap); 2273 } 2274 2275 /* setting copy relation is only allowed for offline secondary */ 2276 if (sec_devmap->device) 2277 return -EINVAL; 2278 2279 if (prim_devmap->copy) { 2280 copy = prim_devmap->copy; 2281 } else if (sec_devmap->copy) { 2282 copy = sec_devmap->copy; 2283 } else { 2284 copy = kzalloc(sizeof(*copy), GFP_KERNEL); 2285 if (!copy) 2286 return -ENOMEM; 2287 } 2288 spin_lock(&dasd_devmap_lock); 2289 rc = dasd_devmap_set_copy_relation(prim_devmap, copy, prim_busid, true); 2290 if (rc) { 2291 spin_unlock(&dasd_devmap_lock); 2292 return rc; 2293 } 2294 rc = dasd_devmap_set_copy_relation(sec_devmap, copy, sec_busid, false); 2295 if (rc) { 2296 spin_unlock(&dasd_devmap_lock); 2297 return rc; 2298 } 2299 spin_unlock(&dasd_devmap_lock); 2300 2301 /* if primary device is already online call device setup directly */ 2302 if (prim_devmap->device && !prim_devmap->device->copy) { 2303 device = prim_devmap->device; 2304 if (device->discipline->pprc_enabled) { 2305 pprc_enabled = device->discipline->pprc_enabled(device); 2306 rc = dasd_devmap_set_device_copy_relation(device->cdev, 2307 pprc_enabled); 2308 } else { 2309 rc = -EOPNOTSUPP; 2310 } 2311 } 2312 if (rc) { 2313 dasd_devmap_del_copy_relation(copy, prim_busid); 2314 dasd_devmap_del_copy_relation(copy, sec_busid); 2315 count = rc; 2316 } 2317 2318 return count; 2319 } 2320 static DEVICE_ATTR(copy_pair, 0644, dasd_copy_pair_show, 2321 dasd_copy_pair_store); 2322 2323 static ssize_t 2324 dasd_copy_role_show(struct device *dev, 2325 struct device_attribute *attr, char *buf) 2326 { 2327 struct dasd_copy_relation *copy; 2328 struct dasd_device *device; 2329 int len, i; 2330 2331 device = dasd_device_from_cdev(to_ccwdev(dev)); 2332 if (IS_ERR(device)) 2333 return -ENODEV; 2334 2335 if (!device->copy) { 2336 len = sysfs_emit(buf, "none\n"); 2337 goto out; 2338 } 2339 copy = device->copy; 2340 /* only the active device is primary */ 2341 if (copy->active->device == device) { 2342 len = sysfs_emit(buf, "primary\n"); 2343 goto out; 2344 } 2345 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2346 if (copy->entry[i].device == device) { 2347 len = sysfs_emit(buf, "secondary\n"); 2348 goto out; 2349 } 2350 } 2351 /* not in the list, no COPY role */ 2352 len = sysfs_emit(buf, "none\n"); 2353 out: 2354 dasd_put_device(device); 2355 return len; 2356 } 2357 static DEVICE_ATTR(copy_role, 0444, dasd_copy_role_show, NULL); 2358 2359 static ssize_t dasd_device_ping(struct device *dev, 2360 struct device_attribute *attr, 2361 const char *buf, size_t count) 2362 { 2363 struct dasd_device *device; 2364 size_t rc; 2365 2366 device = dasd_device_from_cdev(to_ccwdev(dev)); 2367 if (IS_ERR(device)) 2368 return -ENODEV; 2369 2370 /* 2371 * do not try during offline processing 2372 * early check only 2373 * the sleep_on function itself checks for offline 2374 * processing again 2375 */ 2376 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 2377 rc = -EBUSY; 2378 goto out; 2379 } 2380 if (!device->discipline || !device->discipline->device_ping) { 2381 rc = -EOPNOTSUPP; 2382 goto out; 2383 } 2384 rc = device->discipline->device_ping(device); 2385 if (!rc) 2386 rc = count; 2387 out: 2388 dasd_put_device(device); 2389 return rc; 2390 } 2391 static DEVICE_ATTR(ping, 0200, NULL, dasd_device_ping); 2392 2393 #define DASD_DEFINE_ATTR(_name, _func) \ 2394 static ssize_t dasd_##_name##_show(struct device *dev, \ 2395 struct device_attribute *attr, \ 2396 char *buf) \ 2397 { \ 2398 struct ccw_device *cdev = to_ccwdev(dev); \ 2399 struct dasd_device *device = dasd_device_from_cdev(cdev); \ 2400 int val = 0; \ 2401 \ 2402 if (IS_ERR(device)) \ 2403 return -ENODEV; \ 2404 if (device->discipline && _func) \ 2405 val = _func(device); \ 2406 dasd_put_device(device); \ 2407 \ 2408 return sysfs_emit(buf, "%d\n", val); \ 2409 } \ 2410 static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \ 2411 2412 DASD_DEFINE_ATTR(ese, device->discipline->is_ese); 2413 DASD_DEFINE_ATTR(extent_size, device->discipline->ext_size); 2414 DASD_DEFINE_ATTR(pool_id, device->discipline->ext_pool_id); 2415 DASD_DEFINE_ATTR(space_configured, device->discipline->space_configured); 2416 DASD_DEFINE_ATTR(space_allocated, device->discipline->space_allocated); 2417 DASD_DEFINE_ATTR(logical_capacity, device->discipline->logical_capacity); 2418 DASD_DEFINE_ATTR(warn_threshold, device->discipline->ext_pool_warn_thrshld); 2419 DASD_DEFINE_ATTR(cap_at_warnlevel, device->discipline->ext_pool_cap_at_warnlevel); 2420 DASD_DEFINE_ATTR(pool_oos, device->discipline->ext_pool_oos); 2421 2422 static struct attribute * dasd_attrs[] = { 2423 &dev_attr_readonly.attr, 2424 &dev_attr_discipline.attr, 2425 &dev_attr_status.attr, 2426 &dev_attr_alias.attr, 2427 &dev_attr_vendor.attr, 2428 &dev_attr_uid.attr, 2429 &dev_attr_use_diag.attr, 2430 &dev_attr_raw_track_access.attr, 2431 &dev_attr_eer_enabled.attr, 2432 &dev_attr_erplog.attr, 2433 &dev_attr_failfast.attr, 2434 &dev_attr_expires.attr, 2435 &dev_attr_retries.attr, 2436 &dev_attr_timeout.attr, 2437 &dev_attr_reservation_policy.attr, 2438 &dev_attr_last_known_reservation_state.attr, 2439 &dev_attr_safe_offline.attr, 2440 &dev_attr_host_access_count.attr, 2441 &dev_attr_path_masks.attr, 2442 &dev_attr_path_threshold.attr, 2443 &dev_attr_path_autodisable.attr, 2444 &dev_attr_path_interval.attr, 2445 &dev_attr_path_reset.attr, 2446 &dev_attr_hpf.attr, 2447 &dev_attr_ese.attr, 2448 &dev_attr_fc_security.attr, 2449 &dev_attr_copy_pair.attr, 2450 &dev_attr_copy_role.attr, 2451 &dev_attr_ping.attr, 2452 &dev_attr_aq_mask.attr, 2453 &dev_attr_aq_requeue.attr, 2454 &dev_attr_aq_timeouts.attr, 2455 NULL, 2456 }; 2457 2458 static const struct attribute_group dasd_attr_group = { 2459 .attrs = dasd_attrs, 2460 }; 2461 2462 static struct attribute *capacity_attrs[] = { 2463 &dev_attr_space_configured.attr, 2464 &dev_attr_space_allocated.attr, 2465 &dev_attr_logical_capacity.attr, 2466 NULL, 2467 }; 2468 2469 static const struct attribute_group capacity_attr_group = { 2470 .name = "capacity", 2471 .attrs = capacity_attrs, 2472 }; 2473 2474 static struct attribute *ext_pool_attrs[] = { 2475 &dev_attr_pool_id.attr, 2476 &dev_attr_extent_size.attr, 2477 &dev_attr_warn_threshold.attr, 2478 &dev_attr_cap_at_warnlevel.attr, 2479 &dev_attr_pool_oos.attr, 2480 NULL, 2481 }; 2482 2483 static const struct attribute_group ext_pool_attr_group = { 2484 .name = "extent_pool", 2485 .attrs = ext_pool_attrs, 2486 }; 2487 2488 const struct attribute_group *dasd_dev_groups[] = { 2489 &dasd_attr_group, 2490 &capacity_attr_group, 2491 &ext_pool_attr_group, 2492 NULL, 2493 }; 2494 EXPORT_SYMBOL_GPL(dasd_dev_groups); 2495 2496 /* 2497 * Return value of the specified feature. 2498 */ 2499 int 2500 dasd_get_feature(struct ccw_device *cdev, int feature) 2501 { 2502 struct dasd_devmap *devmap; 2503 2504 devmap = dasd_find_busid(dev_name(&cdev->dev)); 2505 if (IS_ERR(devmap)) 2506 return PTR_ERR(devmap); 2507 2508 return ((devmap->features & feature) != 0); 2509 } 2510 2511 /* 2512 * Set / reset given feature. 2513 * Flag indicates whether to set (!=0) or the reset (=0) the feature. 2514 */ 2515 int 2516 dasd_set_feature(struct ccw_device *cdev, int feature, int flag) 2517 { 2518 struct dasd_devmap *devmap; 2519 2520 devmap = dasd_devmap_from_cdev(cdev); 2521 if (IS_ERR(devmap)) 2522 return PTR_ERR(devmap); 2523 2524 spin_lock(&dasd_devmap_lock); 2525 if (flag) 2526 devmap->features |= feature; 2527 else 2528 devmap->features &= ~feature; 2529 if (devmap->device) 2530 devmap->device->features = devmap->features; 2531 spin_unlock(&dasd_devmap_lock); 2532 return 0; 2533 } 2534 EXPORT_SYMBOL(dasd_set_feature); 2535 2536 static struct attribute *paths_info_attrs[] = { 2537 &path_fcs_attribute.attr, 2538 NULL, 2539 }; 2540 ATTRIBUTE_GROUPS(paths_info); 2541 2542 static struct kobj_type path_attr_type = { 2543 .release = dasd_path_release, 2544 .default_groups = paths_info_groups, 2545 .sysfs_ops = &kobj_sysfs_ops, 2546 }; 2547 2548 static void dasd_path_init_kobj(struct dasd_device *device, int chp) 2549 { 2550 device->path[chp].kobj.kset = device->paths_info; 2551 kobject_init(&device->path[chp].kobj, &path_attr_type); 2552 } 2553 2554 void dasd_path_create_kobj(struct dasd_device *device, int chp) 2555 { 2556 int rc; 2557 2558 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) 2559 return; 2560 if (!device->paths_info) { 2561 dev_warn(&device->cdev->dev, "Unable to create paths objects\n"); 2562 return; 2563 } 2564 if (device->path[chp].in_sysfs) 2565 return; 2566 if (!device->path[chp].conf_data) 2567 return; 2568 2569 dasd_path_init_kobj(device, chp); 2570 2571 rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x", 2572 device->path[chp].cssid, device->path[chp].chpid); 2573 if (rc) 2574 kobject_put(&device->path[chp].kobj); 2575 device->path[chp].in_sysfs = true; 2576 } 2577 EXPORT_SYMBOL(dasd_path_create_kobj); 2578 2579 void dasd_path_create_kobjects(struct dasd_device *device) 2580 { 2581 u8 lpm, opm; 2582 2583 opm = dasd_path_get_opm(device); 2584 for (lpm = 0x80; lpm; lpm >>= 1) { 2585 if (!(lpm & opm)) 2586 continue; 2587 dasd_path_create_kobj(device, pathmask_to_pos(lpm)); 2588 } 2589 } 2590 EXPORT_SYMBOL(dasd_path_create_kobjects); 2591 2592 static void dasd_path_remove_kobj(struct dasd_device *device, int chp) 2593 { 2594 if (device->path[chp].in_sysfs) { 2595 kobject_put(&device->path[chp].kobj); 2596 device->path[chp].in_sysfs = false; 2597 } 2598 } 2599 2600 /* 2601 * As we keep kobjects for the lifetime of a device, this function must not be 2602 * called anywhere but in the context of offlining a device. 2603 */ 2604 void dasd_path_remove_kobjects(struct dasd_device *device) 2605 { 2606 int i; 2607 2608 for (i = 0; i < 8; i++) 2609 dasd_path_remove_kobj(device, i); 2610 } 2611 EXPORT_SYMBOL(dasd_path_remove_kobjects); 2612 2613 int 2614 dasd_devmap_init(void) 2615 { 2616 int i; 2617 2618 /* Initialize devmap structures. */ 2619 dasd_max_devindex = 0; 2620 for (i = 0; i < 256; i++) 2621 INIT_LIST_HEAD(&dasd_hashlists[i]); 2622 return 0; 2623 } 2624 2625 void 2626 dasd_devmap_exit(void) 2627 { 2628 dasd_forget_ranges(); 2629 } 2630