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_BUS_ID_SIZE 20 30 #define DASD_MAX_PARAMS 256 31 32 #include "dasd_int.h" 33 34 struct kmem_cache *dasd_page_cache; 35 EXPORT_SYMBOL_GPL(dasd_page_cache); 36 37 /* 38 * dasd_devmap_t is used to store the features and the relation 39 * between device number and device index. To find a dasd_devmap_t 40 * that corresponds to a device number of a device index each 41 * dasd_devmap_t is added to two linked lists, one to search by 42 * the device number and one to search by the device index. As 43 * soon as big minor numbers are available the device index list 44 * can be removed since the device number will then be identical 45 * to the device index. 46 */ 47 struct dasd_devmap { 48 struct list_head list; 49 char bus_id[DASD_BUS_ID_SIZE]; 50 unsigned int devindex; 51 unsigned short features; 52 struct dasd_device *device; 53 }; 54 55 /* 56 * Parameter parsing functions for dasd= parameter. The syntax is: 57 * <devno> : (0x)?[0-9a-fA-F]+ 58 * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ 59 * <feature> : ro 60 * <feature_list> : \(<feature>(:<feature>)*\) 61 * <devno-range> : <devno>(-<devno>)?<feature_list>? 62 * <busid-range> : <busid>(-<busid>)?<feature_list>? 63 * <devices> : <devno-range>|<busid-range> 64 * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod 65 * 66 * <dasd> : autodetect|probeonly|<devices>(,<devices>)* 67 */ 68 69 int dasd_probeonly = 0; /* is true, when probeonly mode is active */ 70 int dasd_autodetect = 0; /* is true, when autodetection is active */ 71 int dasd_nopav = 0; /* is true, when PAV is disabled */ 72 EXPORT_SYMBOL_GPL(dasd_nopav); 73 int dasd_nofcx; /* disable High Performance Ficon */ 74 EXPORT_SYMBOL_GPL(dasd_nofcx); 75 76 /* 77 * char *dasd[] is intended to hold the ranges supplied by the dasd= statement 78 * it is named 'dasd' to directly be filled by insmod with the comma separated 79 * strings when running as a module. 80 */ 81 static char *dasd[DASD_MAX_PARAMS]; 82 module_param_array(dasd, charp, NULL, S_IRUGO); 83 84 /* 85 * Single spinlock to protect devmap and servermap structures and lists. 86 */ 87 static DEFINE_SPINLOCK(dasd_devmap_lock); 88 89 /* 90 * Hash lists for devmap structures. 91 */ 92 static struct list_head dasd_hashlists[256]; 93 int dasd_max_devindex; 94 95 static struct dasd_devmap *dasd_add_busid(const char *, int); 96 97 static inline int 98 dasd_hash_busid(const char *bus_id) 99 { 100 int hash, i; 101 102 hash = 0; 103 for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++) 104 hash += *bus_id; 105 return hash & 0xff; 106 } 107 108 #ifndef MODULE 109 static int __init dasd_call_setup(char *opt) 110 { 111 static int i __initdata; 112 char *tmp; 113 114 while (i < DASD_MAX_PARAMS) { 115 tmp = strsep(&opt, ","); 116 if (!tmp) 117 break; 118 119 dasd[i++] = tmp; 120 } 121 122 return 1; 123 } 124 125 __setup ("dasd=", dasd_call_setup); 126 #endif /* #ifndef MODULE */ 127 128 #define DASD_IPLDEV "ipldev" 129 130 /* 131 * Read a device busid/devno from a string. 132 */ 133 static int __init dasd_busid(char *str, int *id0, int *id1, int *devno) 134 { 135 unsigned int val; 136 char *tok; 137 138 /* Interpret ipldev busid */ 139 if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) { 140 if (ipl_info.type != IPL_TYPE_CCW) { 141 pr_err("The IPL device is not a CCW device\n"); 142 return -EINVAL; 143 } 144 *id0 = 0; 145 *id1 = ipl_info.data.ccw.dev_id.ssid; 146 *devno = ipl_info.data.ccw.dev_id.devno; 147 148 return 0; 149 } 150 151 /* Old style 0xXXXX or XXXX */ 152 if (!kstrtouint(str, 16, &val)) { 153 *id0 = *id1 = 0; 154 if (val > 0xffff) 155 return -EINVAL; 156 *devno = val; 157 return 0; 158 } 159 160 /* New style x.y.z busid */ 161 tok = strsep(&str, "."); 162 if (kstrtouint(tok, 16, &val) || val > 0xff) 163 return -EINVAL; 164 *id0 = val; 165 166 tok = strsep(&str, "."); 167 if (kstrtouint(tok, 16, &val) || val > 0xff) 168 return -EINVAL; 169 *id1 = val; 170 171 tok = strsep(&str, "."); 172 if (kstrtouint(tok, 16, &val) || val > 0xffff) 173 return -EINVAL; 174 *devno = val; 175 176 return 0; 177 } 178 179 /* 180 * Read colon separated list of dasd features. 181 */ 182 static int __init dasd_feature_list(char *str) 183 { 184 int features, len, rc; 185 186 features = 0; 187 rc = 0; 188 189 if (!str) 190 return DASD_FEATURE_DEFAULT; 191 192 while (1) { 193 for (len = 0; 194 str[len] && str[len] != ':' && str[len] != ')'; len++); 195 if (len == 2 && !strncmp(str, "ro", 2)) 196 features |= DASD_FEATURE_READONLY; 197 else if (len == 4 && !strncmp(str, "diag", 4)) 198 features |= DASD_FEATURE_USEDIAG; 199 else if (len == 3 && !strncmp(str, "raw", 3)) 200 features |= DASD_FEATURE_USERAW; 201 else if (len == 6 && !strncmp(str, "erplog", 6)) 202 features |= DASD_FEATURE_ERPLOG; 203 else if (len == 8 && !strncmp(str, "failfast", 8)) 204 features |= DASD_FEATURE_FAILFAST; 205 else { 206 pr_warn("%.*s is not a supported device option\n", 207 len, str); 208 rc = -EINVAL; 209 } 210 str += len; 211 if (*str != ':') 212 break; 213 str++; 214 } 215 216 return rc ? : features; 217 } 218 219 /* 220 * Try to match the first element on the comma separated parse string 221 * with one of the known keywords. If a keyword is found, take the approprate 222 * action and return a pointer to the residual string. If the first element 223 * could not be matched to any keyword then return an error code. 224 */ 225 static int __init dasd_parse_keyword(char *keyword) 226 { 227 int length = strlen(keyword); 228 229 if (strncmp("autodetect", keyword, length) == 0) { 230 dasd_autodetect = 1; 231 pr_info("The autodetection mode has been activated\n"); 232 return 0; 233 } 234 if (strncmp("probeonly", keyword, length) == 0) { 235 dasd_probeonly = 1; 236 pr_info("The probeonly mode has been activated\n"); 237 return 0; 238 } 239 if (strncmp("nopav", keyword, length) == 0) { 240 if (MACHINE_IS_VM) 241 pr_info("'nopav' is not supported on z/VM\n"); 242 else { 243 dasd_nopav = 1; 244 pr_info("PAV support has be deactivated\n"); 245 } 246 return 0; 247 } 248 if (strncmp("nofcx", keyword, length) == 0) { 249 dasd_nofcx = 1; 250 pr_info("High Performance FICON support has been " 251 "deactivated\n"); 252 return 0; 253 } 254 if (strncmp("fixedbuffers", keyword, length) == 0) { 255 if (dasd_page_cache) 256 return 0; 257 dasd_page_cache = 258 kmem_cache_create("dasd_page_cache", PAGE_SIZE, 259 PAGE_SIZE, SLAB_CACHE_DMA, 260 NULL); 261 if (!dasd_page_cache) 262 DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, " 263 "fixed buffer mode disabled."); 264 else 265 DBF_EVENT(DBF_INFO, "%s", 266 "turning on fixed buffer mode"); 267 return 0; 268 } 269 270 return -EINVAL; 271 } 272 273 /* 274 * Split a string of a device range into its pieces and return the from, to, and 275 * feature parts separately. 276 * e.g.: 277 * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog 278 * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw 279 * 0x4321 -> from: 0x4321 to: null features: null 280 */ 281 static int __init dasd_evaluate_range_param(char *range, char **from_str, 282 char **to_str, char **features_str) 283 { 284 int rc = 0; 285 286 /* Do we have a range or a single device? */ 287 if (strchr(range, '-')) { 288 *from_str = strsep(&range, "-"); 289 *to_str = strsep(&range, "("); 290 *features_str = strsep(&range, ")"); 291 } else { 292 *from_str = strsep(&range, "("); 293 *features_str = strsep(&range, ")"); 294 } 295 296 if (*features_str && !range) { 297 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n"); 298 rc = -EINVAL; 299 } 300 301 return rc; 302 } 303 304 /* 305 * Try to interprete the range string as a device number or a range of devices. 306 * If the interpretation is successful, create the matching dasd_devmap entries. 307 * If interpretation fails or in case of an error, return an error code. 308 */ 309 static int __init dasd_parse_range(const char *range) 310 { 311 struct dasd_devmap *devmap; 312 int from, from_id0, from_id1; 313 int to, to_id0, to_id1; 314 int features; 315 char bus_id[DASD_BUS_ID_SIZE + 1]; 316 char *features_str = NULL; 317 char *from_str = NULL; 318 char *to_str = NULL; 319 int rc = 0; 320 char *tmp; 321 322 tmp = kstrdup(range, GFP_KERNEL); 323 if (!tmp) 324 return -ENOMEM; 325 326 if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) { 327 rc = -EINVAL; 328 goto out; 329 } 330 331 if (dasd_busid(from_str, &from_id0, &from_id1, &from)) { 332 rc = -EINVAL; 333 goto out; 334 } 335 336 to = from; 337 to_id0 = from_id0; 338 to_id1 = from_id1; 339 if (to_str) { 340 if (dasd_busid(to_str, &to_id0, &to_id1, &to)) { 341 rc = -EINVAL; 342 goto out; 343 } 344 if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) { 345 pr_err("%s is not a valid device range\n", range); 346 rc = -EINVAL; 347 goto out; 348 } 349 } 350 351 features = dasd_feature_list(features_str); 352 if (features < 0) { 353 rc = -EINVAL; 354 goto out; 355 } 356 /* each device in dasd= parameter should be set initially online */ 357 features |= DASD_FEATURE_INITIAL_ONLINE; 358 while (from <= to) { 359 sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++); 360 devmap = dasd_add_busid(bus_id, features); 361 if (IS_ERR(devmap)) { 362 rc = PTR_ERR(devmap); 363 goto out; 364 } 365 } 366 367 out: 368 kfree(tmp); 369 370 return rc; 371 } 372 373 /* 374 * Parse parameters stored in dasd[] 375 * The 'dasd=...' parameter allows to specify a comma separated list of 376 * keywords and device ranges. The parameters in that list will be stored as 377 * separate elementes in dasd[]. 378 */ 379 int __init dasd_parse(void) 380 { 381 int rc, i; 382 char *cur; 383 384 rc = 0; 385 for (i = 0; i < DASD_MAX_PARAMS; i++) { 386 cur = dasd[i]; 387 if (!cur) 388 break; 389 if (*cur == '\0') 390 continue; 391 392 rc = dasd_parse_keyword(cur); 393 if (rc) 394 rc = dasd_parse_range(cur); 395 396 if (rc) 397 break; 398 } 399 400 return rc; 401 } 402 403 /* 404 * Add a devmap for the device specified by busid. It is possible that 405 * the devmap already exists (dasd= parameter). The order of the devices 406 * added through this function will define the kdevs for the individual 407 * devices. 408 */ 409 static struct dasd_devmap * 410 dasd_add_busid(const char *bus_id, int features) 411 { 412 struct dasd_devmap *devmap, *new, *tmp; 413 int hash; 414 415 new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL); 416 if (!new) 417 return ERR_PTR(-ENOMEM); 418 spin_lock(&dasd_devmap_lock); 419 devmap = NULL; 420 hash = dasd_hash_busid(bus_id); 421 list_for_each_entry(tmp, &dasd_hashlists[hash], list) 422 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { 423 devmap = tmp; 424 break; 425 } 426 if (!devmap) { 427 /* This bus_id is new. */ 428 new->devindex = dasd_max_devindex++; 429 strlcpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE); 430 new->features = features; 431 new->device = NULL; 432 list_add(&new->list, &dasd_hashlists[hash]); 433 devmap = new; 434 new = NULL; 435 } 436 spin_unlock(&dasd_devmap_lock); 437 kfree(new); 438 return devmap; 439 } 440 441 /* 442 * Find devmap for device with given bus_id. 443 */ 444 static struct dasd_devmap * 445 dasd_find_busid(const char *bus_id) 446 { 447 struct dasd_devmap *devmap, *tmp; 448 int hash; 449 450 spin_lock(&dasd_devmap_lock); 451 devmap = ERR_PTR(-ENODEV); 452 hash = dasd_hash_busid(bus_id); 453 list_for_each_entry(tmp, &dasd_hashlists[hash], list) { 454 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) { 455 devmap = tmp; 456 break; 457 } 458 } 459 spin_unlock(&dasd_devmap_lock); 460 return devmap; 461 } 462 463 /* 464 * Check if busid has been added to the list of dasd ranges. 465 */ 466 int 467 dasd_busid_known(const char *bus_id) 468 { 469 return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; 470 } 471 472 /* 473 * Forget all about the device numbers added so far. 474 * This may only be called at module unload or system shutdown. 475 */ 476 static void 477 dasd_forget_ranges(void) 478 { 479 struct dasd_devmap *devmap, *n; 480 int i; 481 482 spin_lock(&dasd_devmap_lock); 483 for (i = 0; i < 256; i++) { 484 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { 485 BUG_ON(devmap->device != NULL); 486 list_del(&devmap->list); 487 kfree(devmap); 488 } 489 } 490 spin_unlock(&dasd_devmap_lock); 491 } 492 493 /* 494 * Find the device struct by its device index. 495 */ 496 struct dasd_device * 497 dasd_device_from_devindex(int devindex) 498 { 499 struct dasd_devmap *devmap, *tmp; 500 struct dasd_device *device; 501 int i; 502 503 spin_lock(&dasd_devmap_lock); 504 devmap = NULL; 505 for (i = 0; (i < 256) && !devmap; i++) 506 list_for_each_entry(tmp, &dasd_hashlists[i], list) 507 if (tmp->devindex == devindex) { 508 /* Found the devmap for the device. */ 509 devmap = tmp; 510 break; 511 } 512 if (devmap && devmap->device) { 513 device = devmap->device; 514 dasd_get_device(device); 515 } else 516 device = ERR_PTR(-ENODEV); 517 spin_unlock(&dasd_devmap_lock); 518 return device; 519 } 520 521 /* 522 * Return devmap for cdev. If no devmap exists yet, create one and 523 * connect it to the cdev. 524 */ 525 static struct dasd_devmap * 526 dasd_devmap_from_cdev(struct ccw_device *cdev) 527 { 528 struct dasd_devmap *devmap; 529 530 devmap = dasd_find_busid(dev_name(&cdev->dev)); 531 if (IS_ERR(devmap)) 532 devmap = dasd_add_busid(dev_name(&cdev->dev), 533 DASD_FEATURE_DEFAULT); 534 return devmap; 535 } 536 537 /* 538 * Create a dasd device structure for cdev. 539 */ 540 struct dasd_device * 541 dasd_create_device(struct ccw_device *cdev) 542 { 543 struct dasd_devmap *devmap; 544 struct dasd_device *device; 545 unsigned long flags; 546 int rc; 547 548 devmap = dasd_devmap_from_cdev(cdev); 549 if (IS_ERR(devmap)) 550 return (void *) devmap; 551 552 device = dasd_alloc_device(); 553 if (IS_ERR(device)) 554 return device; 555 atomic_set(&device->ref_count, 3); 556 557 spin_lock(&dasd_devmap_lock); 558 if (!devmap->device) { 559 devmap->device = device; 560 device->devindex = devmap->devindex; 561 device->features = devmap->features; 562 get_device(&cdev->dev); 563 device->cdev = cdev; 564 rc = 0; 565 } else 566 /* Someone else was faster. */ 567 rc = -EBUSY; 568 spin_unlock(&dasd_devmap_lock); 569 570 if (rc) { 571 dasd_free_device(device); 572 return ERR_PTR(rc); 573 } 574 575 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 576 dev_set_drvdata(&cdev->dev, device); 577 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 578 579 device->paths_info = kset_create_and_add("paths_info", NULL, 580 &device->cdev->dev.kobj); 581 if (!device->paths_info) 582 dev_warn(&cdev->dev, "Could not create paths_info kset\n"); 583 584 return device; 585 } 586 587 /* 588 * Wait queue for dasd_delete_device waits. 589 */ 590 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); 591 592 /* 593 * Remove a dasd device structure. The passed referenced 594 * is destroyed. 595 */ 596 void 597 dasd_delete_device(struct dasd_device *device) 598 { 599 struct ccw_device *cdev; 600 struct dasd_devmap *devmap; 601 unsigned long flags; 602 603 /* First remove device pointer from devmap. */ 604 devmap = dasd_find_busid(dev_name(&device->cdev->dev)); 605 BUG_ON(IS_ERR(devmap)); 606 spin_lock(&dasd_devmap_lock); 607 if (devmap->device != device) { 608 spin_unlock(&dasd_devmap_lock); 609 dasd_put_device(device); 610 return; 611 } 612 devmap->device = NULL; 613 spin_unlock(&dasd_devmap_lock); 614 615 /* Disconnect dasd_device structure from ccw_device structure. */ 616 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags); 617 dev_set_drvdata(&device->cdev->dev, NULL); 618 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags); 619 620 /* 621 * Drop ref_count by 3, one for the devmap reference, one for 622 * the cdev reference and one for the passed reference. 623 */ 624 atomic_sub(3, &device->ref_count); 625 626 /* Wait for reference counter to drop to zero. */ 627 wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); 628 629 dasd_generic_free_discipline(device); 630 631 kset_unregister(device->paths_info); 632 633 /* Disconnect dasd_device structure from ccw_device structure. */ 634 cdev = device->cdev; 635 device->cdev = NULL; 636 637 /* Put ccw_device structure. */ 638 put_device(&cdev->dev); 639 640 /* Now the device structure can be freed. */ 641 dasd_free_device(device); 642 } 643 644 /* 645 * Reference counter dropped to zero. Wake up waiter 646 * in dasd_delete_device. 647 */ 648 void 649 dasd_put_device_wake(struct dasd_device *device) 650 { 651 wake_up(&dasd_delete_wq); 652 } 653 EXPORT_SYMBOL_GPL(dasd_put_device_wake); 654 655 /* 656 * Return dasd_device structure associated with cdev. 657 * This function needs to be called with the ccw device 658 * lock held. It can be used from interrupt context. 659 */ 660 struct dasd_device * 661 dasd_device_from_cdev_locked(struct ccw_device *cdev) 662 { 663 struct dasd_device *device = dev_get_drvdata(&cdev->dev); 664 665 if (!device) 666 return ERR_PTR(-ENODEV); 667 dasd_get_device(device); 668 return device; 669 } 670 671 /* 672 * Return dasd_device structure associated with cdev. 673 */ 674 struct dasd_device * 675 dasd_device_from_cdev(struct ccw_device *cdev) 676 { 677 struct dasd_device *device; 678 unsigned long flags; 679 680 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 681 device = dasd_device_from_cdev_locked(cdev); 682 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 683 return device; 684 } 685 686 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device) 687 { 688 struct dasd_devmap *devmap; 689 690 devmap = dasd_find_busid(dev_name(&device->cdev->dev)); 691 if (IS_ERR(devmap)) 692 return; 693 spin_lock(&dasd_devmap_lock); 694 gdp->private_data = devmap; 695 spin_unlock(&dasd_devmap_lock); 696 } 697 698 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp) 699 { 700 struct dasd_device *device; 701 struct dasd_devmap *devmap; 702 703 if (!gdp->private_data) 704 return NULL; 705 device = NULL; 706 spin_lock(&dasd_devmap_lock); 707 devmap = gdp->private_data; 708 if (devmap && devmap->device) { 709 device = devmap->device; 710 dasd_get_device(device); 711 } 712 spin_unlock(&dasd_devmap_lock); 713 return device; 714 } 715 716 /* 717 * SECTION: files in sysfs 718 */ 719 720 /* 721 * failfast controls the behaviour, if no path is available 722 */ 723 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr, 724 char *buf) 725 { 726 struct dasd_devmap *devmap; 727 int ff_flag; 728 729 devmap = dasd_find_busid(dev_name(dev)); 730 if (!IS_ERR(devmap)) 731 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0; 732 else 733 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0; 734 return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n"); 735 } 736 737 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr, 738 const char *buf, size_t count) 739 { 740 unsigned int val; 741 int rc; 742 743 if (kstrtouint(buf, 0, &val) || val > 1) 744 return -EINVAL; 745 746 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val); 747 748 return rc ? : count; 749 } 750 751 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store); 752 753 /* 754 * readonly controls the readonly status of a dasd 755 */ 756 static ssize_t 757 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) 758 { 759 struct dasd_devmap *devmap; 760 struct dasd_device *device; 761 int ro_flag = 0; 762 763 devmap = dasd_find_busid(dev_name(dev)); 764 if (IS_ERR(devmap)) 765 goto out; 766 767 ro_flag = !!(devmap->features & DASD_FEATURE_READONLY); 768 769 spin_lock(&dasd_devmap_lock); 770 device = devmap->device; 771 if (device) 772 ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags); 773 spin_unlock(&dasd_devmap_lock); 774 775 out: 776 return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); 777 } 778 779 static ssize_t 780 dasd_ro_store(struct device *dev, struct device_attribute *attr, 781 const char *buf, size_t count) 782 { 783 struct ccw_device *cdev = to_ccwdev(dev); 784 struct dasd_device *device; 785 unsigned long flags; 786 unsigned int val; 787 int rc; 788 789 if (kstrtouint(buf, 0, &val) || val > 1) 790 return -EINVAL; 791 792 rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val); 793 if (rc) 794 return rc; 795 796 device = dasd_device_from_cdev(cdev); 797 if (IS_ERR(device)) 798 return count; 799 800 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 801 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags); 802 803 if (!device->block || !device->block->gdp || 804 test_bit(DASD_FLAG_OFFLINE, &device->flags)) { 805 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 806 goto out; 807 } 808 /* Increase open_count to avoid losing the block device */ 809 atomic_inc(&device->block->open_count); 810 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 811 812 set_disk_ro(device->block->gdp, val); 813 atomic_dec(&device->block->open_count); 814 815 out: 816 dasd_put_device(device); 817 818 return count; 819 } 820 821 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); 822 /* 823 * erplog controls the logging of ERP related data 824 * (e.g. failing channel programs). 825 */ 826 static ssize_t 827 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf) 828 { 829 struct dasd_devmap *devmap; 830 int erplog; 831 832 devmap = dasd_find_busid(dev_name(dev)); 833 if (!IS_ERR(devmap)) 834 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0; 835 else 836 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0; 837 return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n"); 838 } 839 840 static ssize_t 841 dasd_erplog_store(struct device *dev, struct device_attribute *attr, 842 const char *buf, size_t count) 843 { 844 unsigned int val; 845 int rc; 846 847 if (kstrtouint(buf, 0, &val) || val > 1) 848 return -EINVAL; 849 850 rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val); 851 852 return rc ? : count; 853 } 854 855 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store); 856 857 /* 858 * use_diag controls whether the driver should use diag rather than ssch 859 * to talk to the device 860 */ 861 static ssize_t 862 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) 863 { 864 struct dasd_devmap *devmap; 865 int use_diag; 866 867 devmap = dasd_find_busid(dev_name(dev)); 868 if (!IS_ERR(devmap)) 869 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; 870 else 871 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; 872 return sprintf(buf, use_diag ? "1\n" : "0\n"); 873 } 874 875 static ssize_t 876 dasd_use_diag_store(struct device *dev, struct device_attribute *attr, 877 const char *buf, size_t count) 878 { 879 struct dasd_devmap *devmap; 880 unsigned int val; 881 ssize_t rc; 882 883 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 884 if (IS_ERR(devmap)) 885 return PTR_ERR(devmap); 886 887 if (kstrtouint(buf, 0, &val) || val > 1) 888 return -EINVAL; 889 890 spin_lock(&dasd_devmap_lock); 891 /* Changing diag discipline flag is only allowed in offline state. */ 892 rc = count; 893 if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) { 894 if (val) 895 devmap->features |= DASD_FEATURE_USEDIAG; 896 else 897 devmap->features &= ~DASD_FEATURE_USEDIAG; 898 } else 899 rc = -EPERM; 900 spin_unlock(&dasd_devmap_lock); 901 return rc; 902 } 903 904 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); 905 906 /* 907 * use_raw controls whether the driver should give access to raw eckd data or 908 * operate in standard mode 909 */ 910 static ssize_t 911 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf) 912 { 913 struct dasd_devmap *devmap; 914 int use_raw; 915 916 devmap = dasd_find_busid(dev_name(dev)); 917 if (!IS_ERR(devmap)) 918 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0; 919 else 920 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0; 921 return sprintf(buf, use_raw ? "1\n" : "0\n"); 922 } 923 924 static ssize_t 925 dasd_use_raw_store(struct device *dev, struct device_attribute *attr, 926 const char *buf, size_t count) 927 { 928 struct dasd_devmap *devmap; 929 ssize_t rc; 930 unsigned long val; 931 932 devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); 933 if (IS_ERR(devmap)) 934 return PTR_ERR(devmap); 935 936 if ((kstrtoul(buf, 10, &val) != 0) || val > 1) 937 return -EINVAL; 938 939 spin_lock(&dasd_devmap_lock); 940 /* Changing diag discipline flag is only allowed in offline state. */ 941 rc = count; 942 if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) { 943 if (val) 944 devmap->features |= DASD_FEATURE_USERAW; 945 else 946 devmap->features &= ~DASD_FEATURE_USERAW; 947 } else 948 rc = -EPERM; 949 spin_unlock(&dasd_devmap_lock); 950 return rc; 951 } 952 953 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show, 954 dasd_use_raw_store); 955 956 static ssize_t 957 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr, 958 const char *buf, size_t count) 959 { 960 struct ccw_device *cdev = to_ccwdev(dev); 961 struct dasd_device *device; 962 unsigned long flags; 963 int rc; 964 965 spin_lock_irqsave(get_ccwdev_lock(cdev), flags); 966 device = dasd_device_from_cdev_locked(cdev); 967 if (IS_ERR(device)) { 968 rc = PTR_ERR(device); 969 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 970 goto out; 971 } 972 973 if (test_bit(DASD_FLAG_OFFLINE, &device->flags) || 974 test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) { 975 /* Already doing offline processing */ 976 dasd_put_device(device); 977 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 978 rc = -EBUSY; 979 goto out; 980 } 981 982 set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags); 983 dasd_put_device(device); 984 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags); 985 986 rc = ccw_device_set_offline(cdev); 987 988 out: 989 return rc ? rc : count; 990 } 991 992 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store); 993 994 static ssize_t 995 dasd_access_show(struct device *dev, struct device_attribute *attr, 996 char *buf) 997 { 998 struct ccw_device *cdev = to_ccwdev(dev); 999 struct dasd_device *device; 1000 int count; 1001 1002 device = dasd_device_from_cdev(cdev); 1003 if (IS_ERR(device)) 1004 return PTR_ERR(device); 1005 1006 if (!device->discipline) 1007 count = -ENODEV; 1008 else if (!device->discipline->host_access_count) 1009 count = -EOPNOTSUPP; 1010 else 1011 count = device->discipline->host_access_count(device); 1012 1013 dasd_put_device(device); 1014 if (count < 0) 1015 return count; 1016 1017 return sprintf(buf, "%d\n", count); 1018 } 1019 1020 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL); 1021 1022 static ssize_t 1023 dasd_discipline_show(struct device *dev, struct device_attribute *attr, 1024 char *buf) 1025 { 1026 struct dasd_device *device; 1027 ssize_t len; 1028 1029 device = dasd_device_from_cdev(to_ccwdev(dev)); 1030 if (IS_ERR(device)) 1031 goto out; 1032 else if (!device->discipline) { 1033 dasd_put_device(device); 1034 goto out; 1035 } else { 1036 len = snprintf(buf, PAGE_SIZE, "%s\n", 1037 device->discipline->name); 1038 dasd_put_device(device); 1039 return len; 1040 } 1041 out: 1042 len = snprintf(buf, PAGE_SIZE, "none\n"); 1043 return len; 1044 } 1045 1046 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); 1047 1048 static ssize_t 1049 dasd_device_status_show(struct device *dev, struct device_attribute *attr, 1050 char *buf) 1051 { 1052 struct dasd_device *device; 1053 ssize_t len; 1054 1055 device = dasd_device_from_cdev(to_ccwdev(dev)); 1056 if (!IS_ERR(device)) { 1057 switch (device->state) { 1058 case DASD_STATE_NEW: 1059 len = snprintf(buf, PAGE_SIZE, "new\n"); 1060 break; 1061 case DASD_STATE_KNOWN: 1062 len = snprintf(buf, PAGE_SIZE, "detected\n"); 1063 break; 1064 case DASD_STATE_BASIC: 1065 len = snprintf(buf, PAGE_SIZE, "basic\n"); 1066 break; 1067 case DASD_STATE_UNFMT: 1068 len = snprintf(buf, PAGE_SIZE, "unformatted\n"); 1069 break; 1070 case DASD_STATE_READY: 1071 len = snprintf(buf, PAGE_SIZE, "ready\n"); 1072 break; 1073 case DASD_STATE_ONLINE: 1074 len = snprintf(buf, PAGE_SIZE, "online\n"); 1075 break; 1076 default: 1077 len = snprintf(buf, PAGE_SIZE, "no stat\n"); 1078 break; 1079 } 1080 dasd_put_device(device); 1081 } else 1082 len = snprintf(buf, PAGE_SIZE, "unknown\n"); 1083 return len; 1084 } 1085 1086 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL); 1087 1088 static ssize_t dasd_alias_show(struct device *dev, 1089 struct device_attribute *attr, char *buf) 1090 { 1091 struct dasd_device *device; 1092 struct dasd_uid uid; 1093 1094 device = dasd_device_from_cdev(to_ccwdev(dev)); 1095 if (IS_ERR(device)) 1096 return sprintf(buf, "0\n"); 1097 1098 if (device->discipline && device->discipline->get_uid && 1099 !device->discipline->get_uid(device, &uid)) { 1100 if (uid.type == UA_BASE_PAV_ALIAS || 1101 uid.type == UA_HYPER_PAV_ALIAS) { 1102 dasd_put_device(device); 1103 return sprintf(buf, "1\n"); 1104 } 1105 } 1106 dasd_put_device(device); 1107 1108 return sprintf(buf, "0\n"); 1109 } 1110 1111 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL); 1112 1113 static ssize_t dasd_vendor_show(struct device *dev, 1114 struct device_attribute *attr, char *buf) 1115 { 1116 struct dasd_device *device; 1117 struct dasd_uid uid; 1118 char *vendor; 1119 1120 device = dasd_device_from_cdev(to_ccwdev(dev)); 1121 vendor = ""; 1122 if (IS_ERR(device)) 1123 return snprintf(buf, PAGE_SIZE, "%s\n", vendor); 1124 1125 if (device->discipline && device->discipline->get_uid && 1126 !device->discipline->get_uid(device, &uid)) 1127 vendor = uid.vendor; 1128 1129 dasd_put_device(device); 1130 1131 return snprintf(buf, PAGE_SIZE, "%s\n", vendor); 1132 } 1133 1134 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL); 1135 1136 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 +\ 1137 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 +\ 1138 /* vduit */ 32 + 1) 1139 1140 static ssize_t 1141 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf) 1142 { 1143 struct dasd_device *device; 1144 struct dasd_uid uid; 1145 char uid_string[UID_STRLEN]; 1146 char ua_string[3]; 1147 1148 device = dasd_device_from_cdev(to_ccwdev(dev)); 1149 uid_string[0] = 0; 1150 if (IS_ERR(device)) 1151 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); 1152 1153 if (device->discipline && device->discipline->get_uid && 1154 !device->discipline->get_uid(device, &uid)) { 1155 switch (uid.type) { 1156 case UA_BASE_DEVICE: 1157 snprintf(ua_string, sizeof(ua_string), "%02x", 1158 uid.real_unit_addr); 1159 break; 1160 case UA_BASE_PAV_ALIAS: 1161 snprintf(ua_string, sizeof(ua_string), "%02x", 1162 uid.base_unit_addr); 1163 break; 1164 case UA_HYPER_PAV_ALIAS: 1165 snprintf(ua_string, sizeof(ua_string), "xx"); 1166 break; 1167 default: 1168 /* should not happen, treat like base device */ 1169 snprintf(ua_string, sizeof(ua_string), "%02x", 1170 uid.real_unit_addr); 1171 break; 1172 } 1173 1174 if (strlen(uid.vduit) > 0) 1175 snprintf(uid_string, sizeof(uid_string), 1176 "%s.%s.%04x.%s.%s", 1177 uid.vendor, uid.serial, uid.ssid, ua_string, 1178 uid.vduit); 1179 else 1180 snprintf(uid_string, sizeof(uid_string), 1181 "%s.%s.%04x.%s", 1182 uid.vendor, uid.serial, uid.ssid, ua_string); 1183 } 1184 dasd_put_device(device); 1185 1186 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string); 1187 } 1188 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL); 1189 1190 /* 1191 * extended error-reporting 1192 */ 1193 static ssize_t 1194 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) 1195 { 1196 struct dasd_devmap *devmap; 1197 int eer_flag; 1198 1199 devmap = dasd_find_busid(dev_name(dev)); 1200 if (!IS_ERR(devmap) && devmap->device) 1201 eer_flag = dasd_eer_enabled(devmap->device); 1202 else 1203 eer_flag = 0; 1204 return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); 1205 } 1206 1207 static ssize_t 1208 dasd_eer_store(struct device *dev, struct device_attribute *attr, 1209 const char *buf, size_t count) 1210 { 1211 struct dasd_device *device; 1212 unsigned int val; 1213 int rc = 0; 1214 1215 device = dasd_device_from_cdev(to_ccwdev(dev)); 1216 if (IS_ERR(device)) 1217 return PTR_ERR(device); 1218 1219 if (kstrtouint(buf, 0, &val) || val > 1) 1220 return -EINVAL; 1221 1222 if (val) 1223 rc = dasd_eer_enable(device); 1224 else 1225 dasd_eer_disable(device); 1226 1227 dasd_put_device(device); 1228 1229 return rc ? : count; 1230 } 1231 1232 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); 1233 1234 /* 1235 * expiration time for default requests 1236 */ 1237 static ssize_t 1238 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf) 1239 { 1240 struct dasd_device *device; 1241 int len; 1242 1243 device = dasd_device_from_cdev(to_ccwdev(dev)); 1244 if (IS_ERR(device)) 1245 return -ENODEV; 1246 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires); 1247 dasd_put_device(device); 1248 return len; 1249 } 1250 1251 static ssize_t 1252 dasd_expires_store(struct device *dev, struct device_attribute *attr, 1253 const char *buf, size_t count) 1254 { 1255 struct dasd_device *device; 1256 unsigned long val; 1257 1258 device = dasd_device_from_cdev(to_ccwdev(dev)); 1259 if (IS_ERR(device)) 1260 return -ENODEV; 1261 1262 if ((kstrtoul(buf, 10, &val) != 0) || 1263 (val > DASD_EXPIRES_MAX) || val == 0) { 1264 dasd_put_device(device); 1265 return -EINVAL; 1266 } 1267 1268 if (val) 1269 device->default_expires = val; 1270 1271 dasd_put_device(device); 1272 return count; 1273 } 1274 1275 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store); 1276 1277 static ssize_t 1278 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf) 1279 { 1280 struct dasd_device *device; 1281 int len; 1282 1283 device = dasd_device_from_cdev(to_ccwdev(dev)); 1284 if (IS_ERR(device)) 1285 return -ENODEV; 1286 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries); 1287 dasd_put_device(device); 1288 return len; 1289 } 1290 1291 static ssize_t 1292 dasd_retries_store(struct device *dev, struct device_attribute *attr, 1293 const char *buf, size_t count) 1294 { 1295 struct dasd_device *device; 1296 unsigned long val; 1297 1298 device = dasd_device_from_cdev(to_ccwdev(dev)); 1299 if (IS_ERR(device)) 1300 return -ENODEV; 1301 1302 if ((kstrtoul(buf, 10, &val) != 0) || 1303 (val > DASD_RETRIES_MAX)) { 1304 dasd_put_device(device); 1305 return -EINVAL; 1306 } 1307 1308 if (val) 1309 device->default_retries = val; 1310 1311 dasd_put_device(device); 1312 return count; 1313 } 1314 1315 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store); 1316 1317 static ssize_t 1318 dasd_timeout_show(struct device *dev, struct device_attribute *attr, 1319 char *buf) 1320 { 1321 struct dasd_device *device; 1322 int len; 1323 1324 device = dasd_device_from_cdev(to_ccwdev(dev)); 1325 if (IS_ERR(device)) 1326 return -ENODEV; 1327 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout); 1328 dasd_put_device(device); 1329 return len; 1330 } 1331 1332 static ssize_t 1333 dasd_timeout_store(struct device *dev, struct device_attribute *attr, 1334 const char *buf, size_t count) 1335 { 1336 struct dasd_device *device; 1337 struct request_queue *q; 1338 unsigned long val; 1339 1340 device = dasd_device_from_cdev(to_ccwdev(dev)); 1341 if (IS_ERR(device) || !device->block) 1342 return -ENODEV; 1343 1344 if ((kstrtoul(buf, 10, &val) != 0) || 1345 val > UINT_MAX / HZ) { 1346 dasd_put_device(device); 1347 return -EINVAL; 1348 } 1349 q = device->block->request_queue; 1350 if (!q) { 1351 dasd_put_device(device); 1352 return -ENODEV; 1353 } 1354 1355 device->blk_timeout = val; 1356 1357 blk_queue_rq_timeout(q, device->blk_timeout * HZ); 1358 1359 dasd_put_device(device); 1360 return count; 1361 } 1362 1363 static DEVICE_ATTR(timeout, 0644, 1364 dasd_timeout_show, dasd_timeout_store); 1365 1366 1367 static ssize_t 1368 dasd_path_reset_store(struct device *dev, struct device_attribute *attr, 1369 const char *buf, size_t count) 1370 { 1371 struct dasd_device *device; 1372 unsigned int val; 1373 1374 device = dasd_device_from_cdev(to_ccwdev(dev)); 1375 if (IS_ERR(device)) 1376 return -ENODEV; 1377 1378 if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff) 1379 val = 0; 1380 1381 if (device->discipline && device->discipline->reset_path) 1382 device->discipline->reset_path(device, (__u8) val); 1383 1384 dasd_put_device(device); 1385 return count; 1386 } 1387 1388 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store); 1389 1390 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr, 1391 char *buf) 1392 { 1393 struct dasd_device *device; 1394 int hpf; 1395 1396 device = dasd_device_from_cdev(to_ccwdev(dev)); 1397 if (IS_ERR(device)) 1398 return -ENODEV; 1399 if (!device->discipline || !device->discipline->hpf_enabled) { 1400 dasd_put_device(device); 1401 return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx); 1402 } 1403 hpf = device->discipline->hpf_enabled(device); 1404 dasd_put_device(device); 1405 return snprintf(buf, PAGE_SIZE, "%d\n", hpf); 1406 } 1407 1408 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL); 1409 1410 static ssize_t dasd_reservation_policy_show(struct device *dev, 1411 struct device_attribute *attr, 1412 char *buf) 1413 { 1414 struct dasd_devmap *devmap; 1415 int rc = 0; 1416 1417 devmap = dasd_find_busid(dev_name(dev)); 1418 if (IS_ERR(devmap)) { 1419 rc = snprintf(buf, PAGE_SIZE, "ignore\n"); 1420 } else { 1421 spin_lock(&dasd_devmap_lock); 1422 if (devmap->features & DASD_FEATURE_FAILONSLCK) 1423 rc = snprintf(buf, PAGE_SIZE, "fail\n"); 1424 else 1425 rc = snprintf(buf, PAGE_SIZE, "ignore\n"); 1426 spin_unlock(&dasd_devmap_lock); 1427 } 1428 return rc; 1429 } 1430 1431 static ssize_t dasd_reservation_policy_store(struct device *dev, 1432 struct device_attribute *attr, 1433 const char *buf, size_t count) 1434 { 1435 struct ccw_device *cdev = to_ccwdev(dev); 1436 int rc; 1437 1438 if (sysfs_streq("ignore", buf)) 1439 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0); 1440 else if (sysfs_streq("fail", buf)) 1441 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1); 1442 else 1443 rc = -EINVAL; 1444 1445 return rc ? : count; 1446 } 1447 1448 static DEVICE_ATTR(reservation_policy, 0644, 1449 dasd_reservation_policy_show, dasd_reservation_policy_store); 1450 1451 static ssize_t dasd_reservation_state_show(struct device *dev, 1452 struct device_attribute *attr, 1453 char *buf) 1454 { 1455 struct dasd_device *device; 1456 int rc = 0; 1457 1458 device = dasd_device_from_cdev(to_ccwdev(dev)); 1459 if (IS_ERR(device)) 1460 return snprintf(buf, PAGE_SIZE, "none\n"); 1461 1462 if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) 1463 rc = snprintf(buf, PAGE_SIZE, "reserved\n"); 1464 else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags)) 1465 rc = snprintf(buf, PAGE_SIZE, "lost\n"); 1466 else 1467 rc = snprintf(buf, PAGE_SIZE, "none\n"); 1468 dasd_put_device(device); 1469 return rc; 1470 } 1471 1472 static ssize_t dasd_reservation_state_store(struct device *dev, 1473 struct device_attribute *attr, 1474 const char *buf, size_t count) 1475 { 1476 struct dasd_device *device; 1477 int rc = 0; 1478 1479 device = dasd_device_from_cdev(to_ccwdev(dev)); 1480 if (IS_ERR(device)) 1481 return -ENODEV; 1482 if (sysfs_streq("reset", buf)) 1483 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags); 1484 else 1485 rc = -EINVAL; 1486 dasd_put_device(device); 1487 1488 if (rc) 1489 return rc; 1490 else 1491 return count; 1492 } 1493 1494 static DEVICE_ATTR(last_known_reservation_state, 0644, 1495 dasd_reservation_state_show, dasd_reservation_state_store); 1496 1497 static ssize_t dasd_pm_show(struct device *dev, 1498 struct device_attribute *attr, char *buf) 1499 { 1500 struct dasd_device *device; 1501 u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm; 1502 1503 device = dasd_device_from_cdev(to_ccwdev(dev)); 1504 if (IS_ERR(device)) 1505 return sprintf(buf, "0\n"); 1506 1507 opm = dasd_path_get_opm(device); 1508 nppm = dasd_path_get_nppm(device); 1509 cablepm = dasd_path_get_cablepm(device); 1510 cuirpm = dasd_path_get_cuirpm(device); 1511 hpfpm = dasd_path_get_hpfpm(device); 1512 ifccpm = dasd_path_get_ifccpm(device); 1513 dasd_put_device(device); 1514 1515 return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm, 1516 cablepm, cuirpm, hpfpm, ifccpm); 1517 } 1518 1519 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL); 1520 1521 /* 1522 * threshold value for IFCC/CCC errors 1523 */ 1524 static ssize_t 1525 dasd_path_threshold_show(struct device *dev, 1526 struct device_attribute *attr, char *buf) 1527 { 1528 struct dasd_device *device; 1529 int len; 1530 1531 device = dasd_device_from_cdev(to_ccwdev(dev)); 1532 if (IS_ERR(device)) 1533 return -ENODEV; 1534 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld); 1535 dasd_put_device(device); 1536 return len; 1537 } 1538 1539 static ssize_t 1540 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr, 1541 const char *buf, size_t count) 1542 { 1543 struct dasd_device *device; 1544 unsigned long flags; 1545 unsigned long val; 1546 1547 device = dasd_device_from_cdev(to_ccwdev(dev)); 1548 if (IS_ERR(device)) 1549 return -ENODEV; 1550 1551 if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) { 1552 dasd_put_device(device); 1553 return -EINVAL; 1554 } 1555 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); 1556 device->path_thrhld = val; 1557 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); 1558 dasd_put_device(device); 1559 return count; 1560 } 1561 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show, 1562 dasd_path_threshold_store); 1563 1564 /* 1565 * configure if path is disabled after IFCC/CCC error threshold is 1566 * exceeded 1567 */ 1568 static ssize_t 1569 dasd_path_autodisable_show(struct device *dev, 1570 struct device_attribute *attr, char *buf) 1571 { 1572 struct dasd_devmap *devmap; 1573 int flag; 1574 1575 devmap = dasd_find_busid(dev_name(dev)); 1576 if (!IS_ERR(devmap)) 1577 flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0; 1578 else 1579 flag = (DASD_FEATURE_DEFAULT & 1580 DASD_FEATURE_PATH_AUTODISABLE) != 0; 1581 return snprintf(buf, PAGE_SIZE, flag ? "1\n" : "0\n"); 1582 } 1583 1584 static ssize_t 1585 dasd_path_autodisable_store(struct device *dev, 1586 struct device_attribute *attr, 1587 const char *buf, size_t count) 1588 { 1589 unsigned int val; 1590 int rc; 1591 1592 if (kstrtouint(buf, 0, &val) || val > 1) 1593 return -EINVAL; 1594 1595 rc = dasd_set_feature(to_ccwdev(dev), 1596 DASD_FEATURE_PATH_AUTODISABLE, val); 1597 1598 return rc ? : count; 1599 } 1600 1601 static DEVICE_ATTR(path_autodisable, 0644, 1602 dasd_path_autodisable_show, 1603 dasd_path_autodisable_store); 1604 /* 1605 * interval for IFCC/CCC checks 1606 * meaning time with no IFCC/CCC error before the error counter 1607 * gets reset 1608 */ 1609 static ssize_t 1610 dasd_path_interval_show(struct device *dev, 1611 struct device_attribute *attr, char *buf) 1612 { 1613 struct dasd_device *device; 1614 int len; 1615 1616 device = dasd_device_from_cdev(to_ccwdev(dev)); 1617 if (IS_ERR(device)) 1618 return -ENODEV; 1619 len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval); 1620 dasd_put_device(device); 1621 return len; 1622 } 1623 1624 static ssize_t 1625 dasd_path_interval_store(struct device *dev, struct device_attribute *attr, 1626 const char *buf, size_t count) 1627 { 1628 struct dasd_device *device; 1629 unsigned long flags; 1630 unsigned long val; 1631 1632 device = dasd_device_from_cdev(to_ccwdev(dev)); 1633 if (IS_ERR(device)) 1634 return -ENODEV; 1635 1636 if ((kstrtoul(buf, 10, &val) != 0) || 1637 (val > DASD_INTERVAL_MAX) || val == 0) { 1638 dasd_put_device(device); 1639 return -EINVAL; 1640 } 1641 spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags); 1642 if (val) 1643 device->path_interval = val; 1644 spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags); 1645 dasd_put_device(device); 1646 return count; 1647 } 1648 1649 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show, 1650 dasd_path_interval_store); 1651 1652 static ssize_t 1653 dasd_device_fcs_show(struct device *dev, struct device_attribute *attr, 1654 char *buf) 1655 { 1656 struct dasd_device *device; 1657 int fc_sec; 1658 int rc; 1659 1660 device = dasd_device_from_cdev(to_ccwdev(dev)); 1661 if (IS_ERR(device)) 1662 return -ENODEV; 1663 fc_sec = dasd_path_get_fcs_device(device); 1664 if (fc_sec == -EINVAL) 1665 rc = snprintf(buf, PAGE_SIZE, "Inconsistent\n"); 1666 else 1667 rc = snprintf(buf, PAGE_SIZE, "%s\n", dasd_path_get_fcs_str(fc_sec)); 1668 dasd_put_device(device); 1669 1670 return rc; 1671 } 1672 static DEVICE_ATTR(fc_security, 0444, dasd_device_fcs_show, NULL); 1673 1674 static ssize_t 1675 dasd_path_fcs_show(struct kobject *kobj, struct kobj_attribute *attr, char *buf) 1676 { 1677 struct dasd_path *path = to_dasd_path(kobj); 1678 unsigned int fc_sec = path->fc_security; 1679 1680 return snprintf(buf, PAGE_SIZE, "%s\n", dasd_path_get_fcs_str(fc_sec)); 1681 } 1682 1683 static struct kobj_attribute path_fcs_attribute = 1684 __ATTR(fc_security, 0444, dasd_path_fcs_show, NULL); 1685 1686 #define DASD_DEFINE_ATTR(_name, _func) \ 1687 static ssize_t dasd_##_name##_show(struct device *dev, \ 1688 struct device_attribute *attr, \ 1689 char *buf) \ 1690 { \ 1691 struct ccw_device *cdev = to_ccwdev(dev); \ 1692 struct dasd_device *device = dasd_device_from_cdev(cdev); \ 1693 int val = 0; \ 1694 \ 1695 if (IS_ERR(device)) \ 1696 return -ENODEV; \ 1697 if (device->discipline && _func) \ 1698 val = _func(device); \ 1699 dasd_put_device(device); \ 1700 \ 1701 return snprintf(buf, PAGE_SIZE, "%d\n", val); \ 1702 } \ 1703 static DEVICE_ATTR(_name, 0444, dasd_##_name##_show, NULL); \ 1704 1705 DASD_DEFINE_ATTR(ese, device->discipline->is_ese); 1706 DASD_DEFINE_ATTR(extent_size, device->discipline->ext_size); 1707 DASD_DEFINE_ATTR(pool_id, device->discipline->ext_pool_id); 1708 DASD_DEFINE_ATTR(space_configured, device->discipline->space_configured); 1709 DASD_DEFINE_ATTR(space_allocated, device->discipline->space_allocated); 1710 DASD_DEFINE_ATTR(logical_capacity, device->discipline->logical_capacity); 1711 DASD_DEFINE_ATTR(warn_threshold, device->discipline->ext_pool_warn_thrshld); 1712 DASD_DEFINE_ATTR(cap_at_warnlevel, device->discipline->ext_pool_cap_at_warnlevel); 1713 DASD_DEFINE_ATTR(pool_oos, device->discipline->ext_pool_oos); 1714 1715 static struct attribute * dasd_attrs[] = { 1716 &dev_attr_readonly.attr, 1717 &dev_attr_discipline.attr, 1718 &dev_attr_status.attr, 1719 &dev_attr_alias.attr, 1720 &dev_attr_vendor.attr, 1721 &dev_attr_uid.attr, 1722 &dev_attr_use_diag.attr, 1723 &dev_attr_raw_track_access.attr, 1724 &dev_attr_eer_enabled.attr, 1725 &dev_attr_erplog.attr, 1726 &dev_attr_failfast.attr, 1727 &dev_attr_expires.attr, 1728 &dev_attr_retries.attr, 1729 &dev_attr_timeout.attr, 1730 &dev_attr_reservation_policy.attr, 1731 &dev_attr_last_known_reservation_state.attr, 1732 &dev_attr_safe_offline.attr, 1733 &dev_attr_host_access_count.attr, 1734 &dev_attr_path_masks.attr, 1735 &dev_attr_path_threshold.attr, 1736 &dev_attr_path_autodisable.attr, 1737 &dev_attr_path_interval.attr, 1738 &dev_attr_path_reset.attr, 1739 &dev_attr_hpf.attr, 1740 &dev_attr_ese.attr, 1741 &dev_attr_fc_security.attr, 1742 NULL, 1743 }; 1744 1745 static const struct attribute_group dasd_attr_group = { 1746 .attrs = dasd_attrs, 1747 }; 1748 1749 static struct attribute *capacity_attrs[] = { 1750 &dev_attr_space_configured.attr, 1751 &dev_attr_space_allocated.attr, 1752 &dev_attr_logical_capacity.attr, 1753 NULL, 1754 }; 1755 1756 static const struct attribute_group capacity_attr_group = { 1757 .name = "capacity", 1758 .attrs = capacity_attrs, 1759 }; 1760 1761 static struct attribute *ext_pool_attrs[] = { 1762 &dev_attr_pool_id.attr, 1763 &dev_attr_extent_size.attr, 1764 &dev_attr_warn_threshold.attr, 1765 &dev_attr_cap_at_warnlevel.attr, 1766 &dev_attr_pool_oos.attr, 1767 NULL, 1768 }; 1769 1770 static const struct attribute_group ext_pool_attr_group = { 1771 .name = "extent_pool", 1772 .attrs = ext_pool_attrs, 1773 }; 1774 1775 static const struct attribute_group *dasd_attr_groups[] = { 1776 &dasd_attr_group, 1777 &capacity_attr_group, 1778 &ext_pool_attr_group, 1779 NULL, 1780 }; 1781 1782 /* 1783 * Return value of the specified feature. 1784 */ 1785 int 1786 dasd_get_feature(struct ccw_device *cdev, int feature) 1787 { 1788 struct dasd_devmap *devmap; 1789 1790 devmap = dasd_find_busid(dev_name(&cdev->dev)); 1791 if (IS_ERR(devmap)) 1792 return PTR_ERR(devmap); 1793 1794 return ((devmap->features & feature) != 0); 1795 } 1796 1797 /* 1798 * Set / reset given feature. 1799 * Flag indicates whether to set (!=0) or the reset (=0) the feature. 1800 */ 1801 int 1802 dasd_set_feature(struct ccw_device *cdev, int feature, int flag) 1803 { 1804 struct dasd_devmap *devmap; 1805 1806 devmap = dasd_devmap_from_cdev(cdev); 1807 if (IS_ERR(devmap)) 1808 return PTR_ERR(devmap); 1809 1810 spin_lock(&dasd_devmap_lock); 1811 if (flag) 1812 devmap->features |= feature; 1813 else 1814 devmap->features &= ~feature; 1815 if (devmap->device) 1816 devmap->device->features = devmap->features; 1817 spin_unlock(&dasd_devmap_lock); 1818 return 0; 1819 } 1820 EXPORT_SYMBOL(dasd_set_feature); 1821 1822 static struct attribute *paths_info_attrs[] = { 1823 &path_fcs_attribute.attr, 1824 NULL, 1825 }; 1826 1827 static struct kobj_type path_attr_type = { 1828 .release = dasd_path_release, 1829 .default_attrs = paths_info_attrs, 1830 .sysfs_ops = &kobj_sysfs_ops, 1831 }; 1832 1833 static void dasd_path_init_kobj(struct dasd_device *device, int chp) 1834 { 1835 device->path[chp].kobj.kset = device->paths_info; 1836 kobject_init(&device->path[chp].kobj, &path_attr_type); 1837 } 1838 1839 void dasd_path_create_kobj(struct dasd_device *device, int chp) 1840 { 1841 int rc; 1842 1843 if (test_bit(DASD_FLAG_OFFLINE, &device->flags)) 1844 return; 1845 if (!device->paths_info) { 1846 dev_warn(&device->cdev->dev, "Unable to create paths objects\n"); 1847 return; 1848 } 1849 if (device->path[chp].in_sysfs) 1850 return; 1851 if (!device->path[chp].conf_data) 1852 return; 1853 1854 dasd_path_init_kobj(device, chp); 1855 1856 rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x", 1857 device->path[chp].cssid, device->path[chp].chpid); 1858 if (rc) 1859 kobject_put(&device->path[chp].kobj); 1860 device->path[chp].in_sysfs = true; 1861 } 1862 EXPORT_SYMBOL(dasd_path_create_kobj); 1863 1864 void dasd_path_create_kobjects(struct dasd_device *device) 1865 { 1866 u8 lpm, opm; 1867 1868 opm = dasd_path_get_opm(device); 1869 for (lpm = 0x80; lpm; lpm >>= 1) { 1870 if (!(lpm & opm)) 1871 continue; 1872 dasd_path_create_kobj(device, pathmask_to_pos(lpm)); 1873 } 1874 } 1875 EXPORT_SYMBOL(dasd_path_create_kobjects); 1876 1877 /* 1878 * As we keep kobjects for the lifetime of a device, this function must not be 1879 * called anywhere but in the context of offlining a device. 1880 */ 1881 void dasd_path_remove_kobj(struct dasd_device *device, int chp) 1882 { 1883 if (device->path[chp].in_sysfs) { 1884 kobject_put(&device->path[chp].kobj); 1885 device->path[chp].in_sysfs = false; 1886 } 1887 } 1888 EXPORT_SYMBOL(dasd_path_remove_kobj); 1889 1890 int dasd_add_sysfs_files(struct ccw_device *cdev) 1891 { 1892 return sysfs_create_groups(&cdev->dev.kobj, dasd_attr_groups); 1893 } 1894 1895 void 1896 dasd_remove_sysfs_files(struct ccw_device *cdev) 1897 { 1898 sysfs_remove_groups(&cdev->dev.kobj, dasd_attr_groups); 1899 } 1900 1901 1902 int 1903 dasd_devmap_init(void) 1904 { 1905 int i; 1906 1907 /* Initialize devmap structures. */ 1908 dasd_max_devindex = 0; 1909 for (i = 0; i < 256; i++) 1910 INIT_LIST_HEAD(&dasd_hashlists[i]); 1911 return 0; 1912 } 1913 1914 void 1915 dasd_devmap_exit(void) 1916 { 1917 dasd_forget_ranges(); 1918 } 1919