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 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ 1382 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\ 1383 /* vduit */ 32 + 1) 1384 1385 static ssize_t 1386 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) 1387 { 1388 struct dasd_device *device; 1389 struct dasd_uid uid; 1390 char uid_string[UID_STRLEN]; 1391 char ua_string[3]; 1392 1393 device = dasd_device_from_cdev(to_ccwdev(dev)); 1394 uid_string[0] = 0; 1395 if (IS_ERR(device)) 1396 return sysfs_emit(buf, "%s\n", uid_string); 1397 1398 if (device->discipline && device->discipline->get_uid && 1399 !device->discipline->get_uid(device, &uid)) { 1400 switch (uid.type) { 1401 case UA_BASE_DEVICE: 1402 snprintf(ua_string, sizeof(ua_string), "%02x", 1403 uid.real_unit_addr); 1404 break; 1405 case UA_BASE_PAV_ALIAS: 1406 snprintf(ua_string, sizeof(ua_string), "%02x", 1407 uid.base_unit_addr); 1408 break; 1409 case UA_HYPER_PAV_ALIAS: 1410 snprintf(ua_string, sizeof(ua_string), "xx"); 1411 break; 1412 default: 1413 /* should not happen, treat like base device */ 1414 snprintf(ua_string, sizeof(ua_string), "%02x", 1415 uid.real_unit_addr); 1416 break; 1417 } 1418 1419 if (strlen(uid.vduit) > 0) 1420 snprintf(uid_string, sizeof(uid_string), 1421 "%s.%s.%04x.%s.%s", 1422 uid.vendor, uid.serial, uid.ssid, ua_string, 1423 uid.vduit); 1424 else 1425 snprintf(uid_string, sizeof(uid_string), 1426 "%s.%s.%04x.%s", 1427 uid.vendor, uid.serial, uid.ssid, ua_string); 1428 } 1429 dasd_put_device(device); 1430 1431 return sysfs_emit(buf, "%s\n", uid_string); 1432 } 1433 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); 1434 1435 /* 1436 * extended error-reporting 1437 */ 1438 static ssize_t 1439 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) 1440 { 1441 struct dasd_devmap *devmap; 1442 int eer_flag; 1443 1444 devmap = dasd_find_busid(dev_name(dev)); 1445 if (!IS_ERR(devmap) && devmap->device) 1446 eer_flag = dasd_eer_enabled(devmap->device); 1447 else 1448 eer_flag = 0; 1449 return sysfs_emit(buf, eer_flag ? "1\n" : "0\n"); 1450 } 1451 1452 static ssize_t 1453 dasd_eer_store(struct device *dev, struct device_attribute *attr, 1454 const char *buf, size_t count) 1455 { 1456 struct dasd_device *device; 1457 unsigned int val; 1458 int rc = 0; 1459 1460 device = dasd_device_from_cdev(to_ccwdev(dev)); 1461 if (IS_ERR(device)) 1462 return PTR_ERR(device); 1463 1464 if (kstrtouint(buf, 0, &val) || val > 1) 1465 return -EINVAL; 1466 1467 if (val) 1468 rc = dasd_eer_enable(device); 1469 else 1470 dasd_eer_disable(device); 1471 1472 dasd_put_device(device); 1473 1474 return rc ? : count; 1475 } 1476 1477 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); 1478 1479 /* 1480 * aq_mask controls if the DASD should be quiesced on certain triggers 1481 * The aq_mask attribute is interpreted as bitmap of the DASD_EER_* triggers. 1482 */ 1483 static ssize_t dasd_aq_mask_show(struct device *dev, struct device_attribute *attr, 1484 char *buf) 1485 { 1486 struct dasd_devmap *devmap; 1487 unsigned int aq_mask = 0; 1488 1489 devmap = dasd_find_busid(dev_name(dev)); 1490 if (!IS_ERR(devmap)) 1491 aq_mask = devmap->aq_mask; 1492 1493 return sysfs_emit(buf, "%d\n", aq_mask); 1494 } 1495 1496 static ssize_t dasd_aq_mask_store(struct device *dev, struct device_attribute *attr, 1497 const char *buf, size_t count) 1498 { 1499 struct dasd_devmap *devmap; 1500 unsigned int val; 1501 1502 if (kstrtouint(buf, 0, &val) || val > DASD_EER_VALID) 1503 return -EINVAL; 1504 1505 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 1506 if (IS_ERR(devmap)) 1507 return PTR_ERR(devmap); 1508 1509 spin_lock(&dasd_devmap_lock); 1510 devmap->aq_mask = val; 1511 if (devmap->device) 1512 devmap->device->aq_mask = devmap->aq_mask; 1513 spin_unlock(&dasd_devmap_lock); 1514 1515 return count; 1516 } 1517 1518 static DEVICE_ATTR(aq_mask, 0644, dasd_aq_mask_show, dasd_aq_mask_store); 1519 1520 /* 1521 * aq_requeue controls if requests are returned to the blocklayer on quiesce 1522 * or if requests are only not started 1523 */ 1524 static ssize_t dasd_aqr_show(struct device *dev, struct device_attribute *attr, 1525 char *buf) 1526 { 1527 struct dasd_devmap *devmap; 1528 int flag; 1529 1530 devmap = dasd_find_busid(dev_name(dev)); 1531 if (!IS_ERR(devmap)) 1532 flag = (devmap->features & DASD_FEATURE_REQUEUEQUIESCE) != 0; 1533 else 1534 flag = (DASD_FEATURE_DEFAULT & 1535 DASD_FEATURE_REQUEUEQUIESCE) != 0; 1536 return sysfs_emit(buf, "%d\n", flag); 1537 } 1538 1539 static ssize_t dasd_aqr_store(struct device *dev, struct device_attribute *attr, 1540 const char *buf, size_t count) 1541 { 1542 bool val; 1543 int rc; 1544 1545 if (kstrtobool(buf, &val)) 1546 return -EINVAL; 1547 1548 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_REQUEUEQUIESCE, val); 1549 1550 return rc ? : count; 1551 } 1552 1553 static DEVICE_ATTR(aq_requeue, 0644, dasd_aqr_show, dasd_aqr_store); 1554 1555 /* 1556 * aq_timeouts controls how much retries have to time out until 1557 * a device gets autoquiesced 1558 */ 1559 static ssize_t 1560 dasd_aq_timeouts_show(struct device *dev, struct device_attribute *attr, 1561 char *buf) 1562 { 1563 struct dasd_device *device; 1564 int len; 1565 1566 device = dasd_device_from_cdev(to_ccwdev(dev)); 1567 if (IS_ERR(device)) 1568 return -ENODEV; 1569 len = sysfs_emit(buf, "%u\n", device->aq_timeouts); 1570 dasd_put_device(device); 1571 return len; 1572 } 1573 1574 static ssize_t 1575 dasd_aq_timeouts_store(struct device *dev, struct device_attribute *attr, 1576 const char *buf, size_t count) 1577 { 1578 struct dasd_device *device; 1579 unsigned int val; 1580 1581 device = dasd_device_from_cdev(to_ccwdev(dev)); 1582 if (IS_ERR(device)) 1583 return -ENODEV; 1584 1585 if ((kstrtouint(buf, 10, &val) != 0) || 1586 val > DASD_RETRIES_MAX || val == 0) { 1587 dasd_put_device(device); 1588 return -EINVAL; 1589 } 1590 1591 if (val) 1592 device->aq_timeouts = val; 1593 1594 dasd_put_device(device); 1595 return count; 1596 } 1597 1598 static DEVICE_ATTR(aq_timeouts, 0644, dasd_aq_timeouts_show, 1599 dasd_aq_timeouts_store); 1600 1601 /* 1602 * expiration time for default requests 1603 */ 1604 static ssize_t 1605 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf) 1606 { 1607 struct dasd_device *device; 1608 int len; 1609 1610 device = dasd_device_from_cdev(to_ccwdev(dev)); 1611 if (IS_ERR(device)) 1612 return -ENODEV; 1613 len = sysfs_emit(buf, "%lu\n", device->default_expires); 1614 dasd_put_device(device); 1615 return len; 1616 } 1617 1618 static ssize_t 1619 dasd_expires_store(struct device *dev, struct device_attribute *attr, 1620 const char *buf, size_t count) 1621 { 1622 struct dasd_device *device; 1623 unsigned long val; 1624 1625 device = dasd_device_from_cdev(to_ccwdev(dev)); 1626 if (IS_ERR(device)) 1627 return -ENODEV; 1628 1629 if ((kstrtoul(buf, 10, &val) != 0) || 1630 (val > DASD_EXPIRES_MAX) || val == 0) { 1631 dasd_put_device(device); 1632 return -EINVAL; 1633 } 1634 1635 if (val) 1636 device->default_expires = val; 1637 1638 dasd_put_device(device); 1639 return count; 1640 } 1641 1642 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); 1643 1644 static ssize_t 1645 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) 1646 { 1647 struct dasd_device *device; 1648 int len; 1649 1650 device = dasd_device_from_cdev(to_ccwdev(dev)); 1651 if (IS_ERR(device)) 1652 return -ENODEV; 1653 len = sysfs_emit(buf, "%lu\n", device->default_retries); 1654 dasd_put_device(device); 1655 return len; 1656 } 1657 1658 static ssize_t 1659 dasd_retries_store(struct device *dev, struct device_attribute *attr, 1660 const char *buf, size_t count) 1661 { 1662 struct dasd_device *device; 1663 unsigned long val; 1664 1665 device = dasd_device_from_cdev(to_ccwdev(dev)); 1666 if (IS_ERR(device)) 1667 return -ENODEV; 1668 1669 if ((kstrtoul(buf, 10, &val) != 0) || 1670 (val > DASD_RETRIES_MAX)) { 1671 dasd_put_device(device); 1672 return -EINVAL; 1673 } 1674 1675 if (val) 1676 device->default_retries = val; 1677 1678 dasd_put_device(device); 1679 return count; 1680 } 1681 1682 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); 1683 1684 static ssize_t 1685 dasd_timeout_show(struct device *dev, struct device_attribute *attr, 1686 char *buf) 1687 { 1688 struct dasd_device *device; 1689 int len; 1690 1691 device = dasd_device_from_cdev(to_ccwdev(dev)); 1692 if (IS_ERR(device)) 1693 return -ENODEV; 1694 len = sysfs_emit(buf, "%lu\n", device->blk_timeout); 1695 dasd_put_device(device); 1696 return len; 1697 } 1698 1699 static ssize_t 1700 dasd_timeout_store(struct device *dev, struct device_attribute *attr, 1701 const char *buf, size_t count) 1702 { 1703 struct dasd_device *device; 1704 unsigned long val; 1705 1706 device = dasd_device_from_cdev(to_ccwdev(dev)); 1707 if (IS_ERR(device) || !device->block) 1708 return -ENODEV; 1709 1710 if ((kstrtoul(buf, 10, &val) != 0) || 1711 val > UINT_MAX / HZ) { 1712 dasd_put_device(device); 1713 return -EINVAL; 1714 } 1715 if (!device->block->gdp) { 1716 dasd_put_device(device); 1717 return -ENODEV; 1718 } 1719 1720 device->blk_timeout = val; 1721 blk_queue_rq_timeout(device->block->gdp->queue, val * HZ); 1722 1723 dasd_put_device(device); 1724 return count; 1725 } 1726 1727 static DEVICE_ATTR(timeout, 0644, 1728 dasd_timeout_show, dasd_timeout_store); 1729 1730 1731 static ssize_t 1732 dasd_path_reset_store(struct device *dev, struct device_attribute *attr, 1733 const char *buf, size_t count) 1734 { 1735 struct dasd_device *device; 1736 unsigned int val; 1737 1738 device = dasd_device_from_cdev(to_ccwdev(dev)); 1739 if (IS_ERR(device)) 1740 return -ENODEV; 1741 1742 if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff) 1743 val = 0; 1744 1745 if (device->discipline && device->discipline->reset_path) 1746 device->discipline->reset_path(device, (__u8) val); 1747 1748 dasd_put_device(device); 1749 return count; 1750 } 1751 1752 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store); 1753 1754 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr, 1755 char *buf) 1756 { 1757 struct dasd_device *device; 1758 int hpf; 1759 1760 device = dasd_device_from_cdev(to_ccwdev(dev)); 1761 if (IS_ERR(device)) 1762 return -ENODEV; 1763 if (!device->discipline || !device->discipline->hpf_enabled) { 1764 dasd_put_device(device); 1765 return sysfs_emit(buf, "%d\n", dasd_nofcx); 1766 } 1767 hpf = device->discipline->hpf_enabled(device); 1768 dasd_put_device(device); 1769 return sysfs_emit(buf, "%d\n", hpf); 1770 } 1771 1772 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL); 1773 1774 static ssize_t dasd_reservation_policy_show(struct device *dev, 1775 struct device_attribute *attr, 1776 char *buf) 1777 { 1778 struct dasd_devmap *devmap; 1779 int rc = 0; 1780 1781 devmap = dasd_find_busid(dev_name(dev)); 1782 if (IS_ERR(devmap)) { 1783 rc = sysfs_emit(buf, "ignore\n"); 1784 } else { 1785 spin_lock(&dasd_devmap_lock); 1786 if (devmap->features & DASD_FEATURE_FAILONSLCK) 1787 rc = sysfs_emit(buf, "fail\n"); 1788 else 1789 rc = sysfs_emit(buf, "ignore\n"); 1790 spin_unlock(&dasd_devmap_lock); 1791 } 1792 return rc; 1793 } 1794 1795 static ssize_t dasd_reservation_policy_store(struct device *dev, 1796 struct device_attribute *attr, 1797 const char *buf, size_t count) 1798 { 1799 struct ccw_device *cdev = to_ccwdev(dev); 1800 int rc; 1801 1802 if (sysfs_streq("ignore", buf)) 1803 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0); 1804 else if (sysfs_streq("fail", buf)) 1805 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1); 1806 else 1807 rc = -EINVAL; 1808 1809 return rc ? : count; 1810 } 1811 1812 static DEVICE_ATTR(reservation_policy, 0644, 1813 dasd_reservation_policy_show, dasd_reservation_policy_store); 1814 1815 static ssize_t dasd_reservation_state_show(struct device *dev, 1816 struct device_attribute *attr, 1817 char *buf) 1818 { 1819 struct dasd_device *device; 1820 int rc = 0; 1821 1822 device = dasd_device_from_cdev(to_ccwdev(dev)); 1823 if (IS_ERR(device)) 1824 return sysfs_emit(buf, "none\n"); 1825 1826 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) 1827 rc = sysfs_emit(buf, "reserved\n"); 1828 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) 1829 rc = sysfs_emit(buf, "lost\n"); 1830 else 1831 rc = sysfs_emit(buf, "none\n"); 1832 dasd_put_device(device); 1833 return rc; 1834 } 1835 1836 static ssize_t dasd_reservation_state_store(struct device *dev, 1837 struct device_attribute *attr, 1838 const char *buf, size_t count) 1839 { 1840 struct dasd_device *device; 1841 int rc = 0; 1842 1843 device = dasd_device_from_cdev(to_ccwdev(dev)); 1844 if (IS_ERR(device)) 1845 return -ENODEV; 1846 if (sysfs_streq("reset", buf)) 1847 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags); 1848 else 1849 rc = -EINVAL; 1850 dasd_put_device(device); 1851 1852 if (rc) 1853 return rc; 1854 else 1855 return count; 1856 } 1857 1858 static DEVICE_ATTR(last_known_reservation_state, 0644, 1859 dasd_reservation_state_show, dasd_reservation_state_store); 1860 1861 static ssize_t dasd_pm_show(struct device *dev, 1862 struct device_attribute *attr, char *buf) 1863 { 1864 struct dasd_device *device; 1865 u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm; 1866 1867 device = dasd_device_from_cdev(to_ccwdev(dev)); 1868 if (IS_ERR(device)) 1869 return sprintf(buf, "0\n"); 1870 1871 opm = dasd_path_get_opm(device); 1872 nppm = dasd_path_get_nppm(device); 1873 cablepm = dasd_path_get_cablepm(device); 1874 cuirpm = dasd_path_get_cuirpm(device); 1875 hpfpm = dasd_path_get_hpfpm(device); 1876 ifccpm = dasd_path_get_ifccpm(device); 1877 dasd_put_device(device); 1878 1879 return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm, 1880 cablepm, cuirpm, hpfpm, ifccpm); 1881 } 1882 1883 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL); 1884 1885 /* 1886 * threshold value for IFCC/CCC errors 1887 */ 1888 static ssize_t 1889 dasd_path_threshold_show(struct device *dev, 1890 struct device_attribute *attr, char *buf) 1891 { 1892 struct dasd_device *device; 1893 int len; 1894 1895 device = dasd_device_from_cdev(to_ccwdev(dev)); 1896 if (IS_ERR(device)) 1897 return -ENODEV; 1898 len = sysfs_emit(buf, "%lu\n", device->path_thrhld); 1899 dasd_put_device(device); 1900 return len; 1901 } 1902 1903 static ssize_t 1904 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr, 1905 const char *buf, size_t count) 1906 { 1907 struct dasd_device *device; 1908 unsigned long flags; 1909 unsigned long val; 1910 1911 device = dasd_device_from_cdev(to_ccwdev(dev)); 1912 if (IS_ERR(device)) 1913 return -ENODEV; 1914 1915 if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) { 1916 dasd_put_device(device); 1917 return -EINVAL; 1918 } 1919 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); 1920 device->path_thrhld = val; 1921 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); 1922 dasd_put_device(device); 1923 return count; 1924 } 1925 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show, 1926 dasd_path_threshold_store); 1927 1928 /* 1929 * configure if path is disabled after IFCC/CCC error threshold is 1930 * exceeded 1931 */ 1932 static ssize_t 1933 dasd_path_autodisable_show(struct device *dev, 1934 struct device_attribute *attr, char *buf) 1935 { 1936 struct dasd_devmap *devmap; 1937 int flag; 1938 1939 devmap = dasd_find_busid(dev_name(dev)); 1940 if (!IS_ERR(devmap)) 1941 flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0; 1942 else 1943 flag = (DASD_FEATURE_DEFAULT & 1944 DASD_FEATURE_PATH_AUTODISABLE) != 0; 1945 return sysfs_emit(buf, flag ? "1\n" : "0\n"); 1946 } 1947 1948 static ssize_t 1949 dasd_path_autodisable_store(struct device *dev, 1950 struct device_attribute *attr, 1951 const char *buf, size_t count) 1952 { 1953 unsigned int val; 1954 int rc; 1955 1956 if (kstrtouint(buf, 0, &val) || val > 1) 1957 return -EINVAL; 1958 1959 rc = dasd_set_feature(to_ccwdev(dev), 1960 DASD_FEATURE_PATH_AUTODISABLE, val); 1961 1962 return rc ? : count; 1963 } 1964 1965 static DEVICE_ATTR(path_autodisable, 0644, 1966 dasd_path_autodisable_show, 1967 dasd_path_autodisable_store); 1968 /* 1969 * interval for IFCC/CCC checks 1970 * meaning time with no IFCC/CCC error before the error counter 1971 * gets reset 1972 */ 1973 static ssize_t 1974 dasd_path_interval_show(struct device *dev, 1975 struct device_attribute *attr, char *buf) 1976 { 1977 struct dasd_device *device; 1978 int len; 1979 1980 device = dasd_device_from_cdev(to_ccwdev(dev)); 1981 if (IS_ERR(device)) 1982 return -ENODEV; 1983 len = sysfs_emit(buf, "%lu\n", device->path_interval); 1984 dasd_put_device(device); 1985 return len; 1986 } 1987 1988 static ssize_t 1989 dasd_path_interval_store(struct device *dev, struct device_attribute *attr, 1990 const char *buf, size_t count) 1991 { 1992 struct dasd_device *device; 1993 unsigned long flags; 1994 unsigned long val; 1995 1996 device = dasd_device_from_cdev(to_ccwdev(dev)); 1997 if (IS_ERR(device)) 1998 return -ENODEV; 1999 2000 if ((kstrtoul(buf, 10, &val) != 0) || 2001 (val > DASD_INTERVAL_MAX) || val == 0) { 2002 dasd_put_device(device); 2003 return -EINVAL; 2004 } 2005 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); 2006 if (val) 2007 device->path_interval = val; 2008 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); 2009 dasd_put_device(device); 2010 return count; 2011 } 2012 2013 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show, 2014 dasd_path_interval_store); 2015 2016 static ssize_t 2017 dasd_device_fcs_show(struct device *dev, struct device_attribute *attr, 2018 char *buf) 2019 { 2020 struct dasd_device *device; 2021 int fc_sec; 2022 int rc; 2023 2024 device = dasd_device_from_cdev(to_ccwdev(dev)); 2025 if (IS_ERR(device)) 2026 return -ENODEV; 2027 fc_sec = dasd_path_get_fcs_device(device); 2028 if (fc_sec == -EINVAL) 2029 rc = sysfs_emit(buf, "Inconsistent\n"); 2030 else 2031 rc = sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec)); 2032 dasd_put_device(device); 2033 2034 return rc; 2035 } 2036 static DEVICE_ATTR(fc_security, 0444, dasd_device_fcs_show, NULL); 2037 2038 static ssize_t 2039 dasd_path_fcs_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) 2040 { 2041 struct dasd_path *path = to_dasd_path(kobj); 2042 unsigned int fc_sec = path->fc_security; 2043 2044 return sysfs_emit(buf, "%s\n", dasd_path_get_fcs_str(fc_sec)); 2045 } 2046 2047 static struct kobj_attribute path_fcs_attribute = 2048 __ATTR(fc_security, 0444, dasd_path_fcs_show, NULL); 2049 2050 /* 2051 * print copy relation in the form 2052 * primary,secondary[1] primary,secondary[2], ... 2053 */ 2054 static ssize_t 2055 dasd_copy_pair_show(struct device *dev, 2056 struct device_attribute *attr, char *buf) 2057 { 2058 char prim_busid[DASD_BUS_ID_SIZE]; 2059 struct dasd_copy_relation *copy; 2060 struct dasd_devmap *devmap; 2061 int len = 0; 2062 int i; 2063 2064 devmap = dasd_find_busid(dev_name(dev)); 2065 if (IS_ERR(devmap)) 2066 return -ENODEV; 2067 2068 if (!devmap->copy) 2069 return -ENODEV; 2070 2071 copy = devmap->copy; 2072 /* find primary */ 2073 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2074 if (copy->entry[i].configured && copy->entry[i].primary) { 2075 strscpy(prim_busid, copy->entry[i].busid, 2076 DASD_BUS_ID_SIZE); 2077 break; 2078 } 2079 } 2080 if (i == DASD_CP_ENTRIES) 2081 goto out; 2082 2083 /* print all secondary */ 2084 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2085 if (copy->entry[i].configured && !copy->entry[i].primary) 2086 len += sysfs_emit_at(buf, len, "%s,%s ", prim_busid, 2087 copy->entry[i].busid); 2088 } 2089 2090 len += sysfs_emit_at(buf, len, "\n"); 2091 out: 2092 return len; 2093 } 2094 2095 static int dasd_devmap_set_copy_relation(struct dasd_devmap *devmap, 2096 struct dasd_copy_relation *copy, 2097 char *busid, bool primary) 2098 { 2099 int i; 2100 2101 /* find free entry */ 2102 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2103 /* current bus_id already included, nothing to do */ 2104 if (copy->entry[i].configured && 2105 strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0) 2106 return 0; 2107 2108 if (!copy->entry[i].configured) 2109 break; 2110 } 2111 if (i == DASD_CP_ENTRIES) 2112 return -EINVAL; 2113 2114 copy->entry[i].configured = true; 2115 strscpy(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE); 2116 if (primary) { 2117 copy->active = ©->entry[i]; 2118 copy->entry[i].primary = true; 2119 } 2120 if (!devmap->copy) 2121 devmap->copy = copy; 2122 2123 return 0; 2124 } 2125 2126 static void dasd_devmap_del_copy_relation(struct dasd_copy_relation *copy, 2127 char *busid) 2128 { 2129 int i; 2130 2131 spin_lock(&dasd_devmap_lock); 2132 /* find entry */ 2133 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2134 if (copy->entry[i].configured && 2135 strncmp(copy->entry[i].busid, busid, DASD_BUS_ID_SIZE) == 0) 2136 break; 2137 } 2138 if (i == DASD_CP_ENTRIES || !copy->entry[i].configured) { 2139 spin_unlock(&dasd_devmap_lock); 2140 return; 2141 } 2142 2143 copy->entry[i].configured = false; 2144 memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE); 2145 if (copy->active == ©->entry[i]) { 2146 copy->active = NULL; 2147 copy->entry[i].primary = false; 2148 } 2149 spin_unlock(&dasd_devmap_lock); 2150 } 2151 2152 static int dasd_devmap_clear_copy_relation(struct device *dev) 2153 { 2154 struct dasd_copy_relation *copy; 2155 struct dasd_devmap *devmap; 2156 int i, rc = 1; 2157 2158 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 2159 if (IS_ERR(devmap)) 2160 return 1; 2161 2162 spin_lock(&dasd_devmap_lock); 2163 if (!devmap->copy) 2164 goto out; 2165 2166 copy = devmap->copy; 2167 /* first check if all secondary devices are offline*/ 2168 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2169 if (!copy->entry[i].configured) 2170 continue; 2171 2172 if (copy->entry[i].device == copy->active->device) 2173 continue; 2174 2175 if (copy->entry[i].device) 2176 goto out; 2177 } 2178 /* clear all devmap entries */ 2179 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2180 if (strlen(copy->entry[i].busid) == 0) 2181 continue; 2182 if (copy->entry[i].device) { 2183 dasd_put_device(copy->entry[i].device); 2184 copy->entry[i].device->copy = NULL; 2185 copy->entry[i].device = NULL; 2186 } 2187 devmap = dasd_find_busid_locked(copy->entry[i].busid); 2188 devmap->copy = NULL; 2189 memset(copy->entry[i].busid, 0, DASD_BUS_ID_SIZE); 2190 } 2191 kfree(copy); 2192 rc = 0; 2193 out: 2194 spin_unlock(&dasd_devmap_lock); 2195 return rc; 2196 } 2197 2198 /* 2199 * parse BUSIDs from a copy pair 2200 */ 2201 static int dasd_devmap_parse_busid(const char *buf, char *prim_busid, 2202 char *sec_busid) 2203 { 2204 char *primary, *secondary, *tmp, *pt; 2205 int id0, id1, id2; 2206 2207 pt = kstrdup(buf, GFP_KERNEL); 2208 tmp = pt; 2209 if (!tmp) 2210 return -ENOMEM; 2211 2212 primary = strsep(&tmp, ","); 2213 if (!primary) { 2214 kfree(pt); 2215 return -EINVAL; 2216 } 2217 secondary = strsep(&tmp, ","); 2218 if (!secondary) { 2219 kfree(pt); 2220 return -EINVAL; 2221 } 2222 if (dasd_busid(primary, &id0, &id1, &id2)) { 2223 kfree(pt); 2224 return -EINVAL; 2225 } 2226 sprintf(prim_busid, "%01x.%01x.%04x", id0, id1, id2); 2227 if (dasd_busid(secondary, &id0, &id1, &id2)) { 2228 kfree(pt); 2229 return -EINVAL; 2230 } 2231 sprintf(sec_busid, "%01x.%01x.%04x", id0, id1, id2); 2232 kfree(pt); 2233 2234 return 0; 2235 } 2236 2237 static ssize_t dasd_copy_pair_store(struct device *dev, 2238 struct device_attribute *attr, 2239 const char *buf, size_t count) 2240 { 2241 struct dasd_devmap *prim_devmap, *sec_devmap; 2242 char prim_busid[DASD_BUS_ID_SIZE]; 2243 char sec_busid[DASD_BUS_ID_SIZE]; 2244 struct dasd_copy_relation *copy; 2245 struct dasd_device *device; 2246 bool pprc_enabled; 2247 int rc; 2248 2249 if (strncmp(buf, "clear", strlen("clear")) == 0) { 2250 if (dasd_devmap_clear_copy_relation(dev)) 2251 return -EINVAL; 2252 return count; 2253 } 2254 2255 rc = dasd_devmap_parse_busid(buf, prim_busid, sec_busid); 2256 if (rc) 2257 return rc; 2258 2259 if (strncmp(dev_name(dev), prim_busid, DASD_BUS_ID_SIZE) != 0 && 2260 strncmp(dev_name(dev), sec_busid, DASD_BUS_ID_SIZE) != 0) 2261 return -EINVAL; 2262 2263 /* allocate primary devmap if needed */ 2264 prim_devmap = dasd_find_busid(prim_busid); 2265 if (IS_ERR(prim_devmap)) 2266 prim_devmap = dasd_add_busid(prim_busid, DASD_FEATURE_DEFAULT); 2267 2268 /* allocate secondary devmap if needed */ 2269 sec_devmap = dasd_find_busid(sec_busid); 2270 if (IS_ERR(sec_devmap)) 2271 sec_devmap = dasd_add_busid(sec_busid, DASD_FEATURE_DEFAULT); 2272 2273 /* setting copy relation is only allowed for offline secondary */ 2274 if (sec_devmap->device) 2275 return -EINVAL; 2276 2277 if (prim_devmap->copy) { 2278 copy = prim_devmap->copy; 2279 } else if (sec_devmap->copy) { 2280 copy = sec_devmap->copy; 2281 } else { 2282 copy = kzalloc(sizeof(*copy), GFP_KERNEL); 2283 if (!copy) 2284 return -ENOMEM; 2285 } 2286 spin_lock(&dasd_devmap_lock); 2287 rc = dasd_devmap_set_copy_relation(prim_devmap, copy, prim_busid, true); 2288 if (rc) { 2289 spin_unlock(&dasd_devmap_lock); 2290 return rc; 2291 } 2292 rc = dasd_devmap_set_copy_relation(sec_devmap, copy, sec_busid, false); 2293 if (rc) { 2294 spin_unlock(&dasd_devmap_lock); 2295 return rc; 2296 } 2297 spin_unlock(&dasd_devmap_lock); 2298 2299 /* if primary device is already online call device setup directly */ 2300 if (prim_devmap->device && !prim_devmap->device->copy) { 2301 device = prim_devmap->device; 2302 if (device->discipline->pprc_enabled) { 2303 pprc_enabled = device->discipline->pprc_enabled(device); 2304 rc = dasd_devmap_set_device_copy_relation(device->cdev, 2305 pprc_enabled); 2306 } else { 2307 rc = -EOPNOTSUPP; 2308 } 2309 } 2310 if (rc) { 2311 dasd_devmap_del_copy_relation(copy, prim_busid); 2312 dasd_devmap_del_copy_relation(copy, sec_busid); 2313 count = rc; 2314 } 2315 2316 return count; 2317 } 2318 static DEVICE_ATTR(copy_pair, 0644, dasd_copy_pair_show, 2319 dasd_copy_pair_store); 2320 2321 static ssize_t 2322 dasd_copy_role_show(struct device *dev, 2323 struct device_attribute *attr, char *buf) 2324 { 2325 struct dasd_copy_relation *copy; 2326 struct dasd_device *device; 2327 int len, i; 2328 2329 device = dasd_device_from_cdev(to_ccwdev(dev)); 2330 if (IS_ERR(device)) 2331 return -ENODEV; 2332 2333 if (!device->copy) { 2334 len = sysfs_emit(buf, "none\n"); 2335 goto out; 2336 } 2337 copy = device->copy; 2338 /* only the active device is primary */ 2339 if (copy->active->device == device) { 2340 len = sysfs_emit(buf, "primary\n"); 2341 goto out; 2342 } 2343 for (i = 0; i < DASD_CP_ENTRIES; i++) { 2344 if (copy->entry[i].device == device) { 2345 len = sysfs_emit(buf, "secondary\n"); 2346 goto out; 2347 } 2348 } 2349 /* not in the list, no COPY role */ 2350 len = sysfs_emit(buf, "none\n"); 2351 out: 2352 dasd_put_device(device); 2353 return len; 2354 } 2355 static DEVICE_ATTR(copy_role, 0444, dasd_copy_role_show, NULL); 2356 2357 static ssize_t dasd_device_ping(struct device *dev, 2358 struct device_attribute *attr, 2359 const char *buf, size_t count) 2360 { 2361 struct dasd_device *device; 2362 size_t rc; 2363 2364 device = dasd_device_from_cdev(to_ccwdev(dev)); 2365 if (IS_ERR(device)) 2366 return -ENODEV; 2367 2368 /* 2369 * do not try during offline processing 2370 * early check only 2371 * the sleep_on function itself checks for offline 2372 * processing again 2373 */ 2374 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 2375 rc = -EBUSY; 2376 goto out; 2377 } 2378 if (!device->discipline || !device->discipline->device_ping) { 2379 rc = -EOPNOTSUPP; 2380 goto out; 2381 } 2382 rc = device->discipline->device_ping(device); 2383 if (!rc) 2384 rc = count; 2385 out: 2386 dasd_put_device(device); 2387 return rc; 2388 } 2389 static DEVICE_ATTR(ping, 0200, NULL, dasd_device_ping); 2390 2391 #define DASD_DEFINE_ATTR(_name, _func) \ 2392 static ssize_t dasd_##_name##_show(struct device *dev, \ 2393 struct device_attribute *attr, \ 2394 char *buf) \ 2395 { \ 2396 struct ccw_device *cdev = to_ccwdev(dev); \ 2397 struct dasd_device *device = dasd_device_from_cdev(cdev); \ 2398 int val = 0; \ 2399 \ 2400 if (IS_ERR(device)) \ 2401 return -ENODEV; \ 2402 if (device->discipline && _func) \ 2403 val = _func(device); \ 2404 dasd_put_device(device); \ 2405 \ 2406 return sysfs_emit(buf, "%d\n", val); \ 2407 } \ 2408 static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \ 2409 2410 DASD_DEFINE_ATTR(ese, device->discipline->is_ese); 2411 DASD_DEFINE_ATTR(extent_size, device->discipline->ext_size); 2412 DASD_DEFINE_ATTR(pool_id, device->discipline->ext_pool_id); 2413 DASD_DEFINE_ATTR(space_configured, device->discipline->space_configured); 2414 DASD_DEFINE_ATTR(space_allocated, device->discipline->space_allocated); 2415 DASD_DEFINE_ATTR(logical_capacity, device->discipline->logical_capacity); 2416 DASD_DEFINE_ATTR(warn_threshold, device->discipline->ext_pool_warn_thrshld); 2417 DASD_DEFINE_ATTR(cap_at_warnlevel, device->discipline->ext_pool_cap_at_warnlevel); 2418 DASD_DEFINE_ATTR(pool_oos, device->discipline->ext_pool_oos); 2419 2420 static struct attribute * dasd_attrs[] = { 2421 &dev_attr_readonly.attr, 2422 &dev_attr_discipline.attr, 2423 &dev_attr_status.attr, 2424 &dev_attr_alias.attr, 2425 &dev_attr_vendor.attr, 2426 &dev_attr_uid.attr, 2427 &dev_attr_use_diag.attr, 2428 &dev_attr_raw_track_access.attr, 2429 &dev_attr_eer_enabled.attr, 2430 &dev_attr_erplog.attr, 2431 &dev_attr_failfast.attr, 2432 &dev_attr_expires.attr, 2433 &dev_attr_retries.attr, 2434 &dev_attr_timeout.attr, 2435 &dev_attr_reservation_policy.attr, 2436 &dev_attr_last_known_reservation_state.attr, 2437 &dev_attr_safe_offline.attr, 2438 &dev_attr_host_access_count.attr, 2439 &dev_attr_path_masks.attr, 2440 &dev_attr_path_threshold.attr, 2441 &dev_attr_path_autodisable.attr, 2442 &dev_attr_path_interval.attr, 2443 &dev_attr_path_reset.attr, 2444 &dev_attr_hpf.attr, 2445 &dev_attr_ese.attr, 2446 &dev_attr_fc_security.attr, 2447 &dev_attr_copy_pair.attr, 2448 &dev_attr_copy_role.attr, 2449 &dev_attr_ping.attr, 2450 &dev_attr_aq_mask.attr, 2451 &dev_attr_aq_requeue.attr, 2452 &dev_attr_aq_timeouts.attr, 2453 NULL, 2454 }; 2455 2456 static const struct attribute_group dasd_attr_group = { 2457 .attrs = dasd_attrs, 2458 }; 2459 2460 static struct attribute *capacity_attrs[] = { 2461 &dev_attr_space_configured.attr, 2462 &dev_attr_space_allocated.attr, 2463 &dev_attr_logical_capacity.attr, 2464 NULL, 2465 }; 2466 2467 static const struct attribute_group capacity_attr_group = { 2468 .name = "capacity", 2469 .attrs = capacity_attrs, 2470 }; 2471 2472 static struct attribute *ext_pool_attrs[] = { 2473 &dev_attr_pool_id.attr, 2474 &dev_attr_extent_size.attr, 2475 &dev_attr_warn_threshold.attr, 2476 &dev_attr_cap_at_warnlevel.attr, 2477 &dev_attr_pool_oos.attr, 2478 NULL, 2479 }; 2480 2481 static const struct attribute_group ext_pool_attr_group = { 2482 .name = "extent_pool", 2483 .attrs = ext_pool_attrs, 2484 }; 2485 2486 const struct attribute_group *dasd_dev_groups[] = { 2487 &dasd_attr_group, 2488 &capacity_attr_group, 2489 &ext_pool_attr_group, 2490 NULL, 2491 }; 2492 EXPORT_SYMBOL_GPL(dasd_dev_groups); 2493 2494 /* 2495 * Return value of the specified feature. 2496 */ 2497 int 2498 dasd_get_feature(struct ccw_device *cdev, int feature) 2499 { 2500 struct dasd_devmap *devmap; 2501 2502 devmap = dasd_find_busid(dev_name(&cdev->dev)); 2503 if (IS_ERR(devmap)) 2504 return PTR_ERR(devmap); 2505 2506 return ((devmap->features & feature) != 0); 2507 } 2508 2509 /* 2510 * Set / reset given feature. 2511 * Flag indicates whether to set (!=0) or the reset (=0) the feature. 2512 */ 2513 int 2514 dasd_set_feature(struct ccw_device *cdev, int feature, int flag) 2515 { 2516 struct dasd_devmap *devmap; 2517 2518 devmap = dasd_devmap_from_cdev(cdev); 2519 if (IS_ERR(devmap)) 2520 return PTR_ERR(devmap); 2521 2522 spin_lock(&dasd_devmap_lock); 2523 if (flag) 2524 devmap->features |= feature; 2525 else 2526 devmap->features &= ~feature; 2527 if (devmap->device) 2528 devmap->device->features = devmap->features; 2529 spin_unlock(&dasd_devmap_lock); 2530 return 0; 2531 } 2532 EXPORT_SYMBOL(dasd_set_feature); 2533 2534 static struct attribute *paths_info_attrs[] = { 2535 &path_fcs_attribute.attr, 2536 NULL, 2537 }; 2538 ATTRIBUTE_GROUPS(paths_info); 2539 2540 static struct kobj_type path_attr_type = { 2541 .release = dasd_path_release, 2542 .default_groups = paths_info_groups, 2543 .sysfs_ops = &kobj_sysfs_ops, 2544 }; 2545 2546 static void dasd_path_init_kobj(struct dasd_device *device, int chp) 2547 { 2548 device->path[chp].kobj.kset = device->paths_info; 2549 kobject_init(&device->path[chp].kobj, &path_attr_type); 2550 } 2551 2552 void dasd_path_create_kobj(struct dasd_device *device, int chp) 2553 { 2554 int rc; 2555 2556 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) 2557 return; 2558 if (!device->paths_info) { 2559 dev_warn(&device->cdev->dev, "Unable to create paths objects\n"); 2560 return; 2561 } 2562 if (device->path[chp].in_sysfs) 2563 return; 2564 if (!device->path[chp].conf_data) 2565 return; 2566 2567 dasd_path_init_kobj(device, chp); 2568 2569 rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x", 2570 device->path[chp].cssid, device->path[chp].chpid); 2571 if (rc) 2572 kobject_put(&device->path[chp].kobj); 2573 device->path[chp].in_sysfs = true; 2574 } 2575 EXPORT_SYMBOL(dasd_path_create_kobj); 2576 2577 void dasd_path_create_kobjects(struct dasd_device *device) 2578 { 2579 u8 lpm, opm; 2580 2581 opm = dasd_path_get_opm(device); 2582 for (lpm = 0x80; lpm; lpm >>= 1) { 2583 if (!(lpm & opm)) 2584 continue; 2585 dasd_path_create_kobj(device, pathmask_to_pos(lpm)); 2586 } 2587 } 2588 EXPORT_SYMBOL(dasd_path_create_kobjects); 2589 2590 static void dasd_path_remove_kobj(struct dasd_device *device, int chp) 2591 { 2592 if (device->path[chp].in_sysfs) { 2593 kobject_put(&device->path[chp].kobj); 2594 device->path[chp].in_sysfs = false; 2595 } 2596 } 2597 2598 /* 2599 * As we keep kobjects for the lifetime of a device, this function must not be 2600 * called anywhere but in the context of offlining a device. 2601 */ 2602 void dasd_path_remove_kobjects(struct dasd_device *device) 2603 { 2604 int i; 2605 2606 for (i = 0; i < 8; i++) 2607 dasd_path_remove_kobj(device, i); 2608 } 2609 EXPORT_SYMBOL(dasd_path_remove_kobjects); 2610 2611 int 2612 dasd_devmap_init(void) 2613 { 2614 int i; 2615 2616 /* Initialize devmap structures. */ 2617 dasd_max_devindex = 0; 2618 for (i = 0; i < 256; i++) 2619 INIT_LIST_HEAD(&dasd_hashlists[i]); 2620 return 0; 2621 } 2622 2623 void 2624 dasd_devmap_exit(void) 2625 { 2626 dasd_forget_ranges(); 2627 } 2628