drivers/s390/block/dasd_devmap.c

   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 const struct attribute_group *dasd_dev_groups[] = {
1776         &dasd_attr_group,
1777         &capacity_attr_group,
1778         &ext_pool_attr_group,
1779         NULL,
1780 };
1781 EXPORT_SYMBOL_GPL(dasd_dev_groups);
1782
1783 /*
1784  * Return value of the specified feature.
1785  */
1786 int
1787 dasd_get_feature(struct ccw_device *cdev, int feature)
1788 {
1789         struct dasd_devmap *devmap;
1790
1791         devmap = dasd_find_busid(dev_name(&cdev->dev));
1792         if (IS_ERR(devmap))
1793                 return PTR_ERR(devmap);
1794
1795         return ((devmap->features & feature) != 0);
1796 }
1797
1798 /*
1799  * Set / reset given feature.
1800  * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1801  */
1802 int
1803 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1804 {
1805         struct dasd_devmap *devmap;
1806
1807         devmap = dasd_devmap_from_cdev(cdev);
1808         if (IS_ERR(devmap))
1809                 return PTR_ERR(devmap);
1810
1811         spin_lock(&dasd_devmap_lock);
1812         if (flag)
1813                 devmap->features |= feature;
1814         else
1815                 devmap->features &= ~feature;
1816         if (devmap->device)
1817                 devmap->device->features = devmap->features;
1818         spin_unlock(&dasd_devmap_lock);
1819         return 0;
1820 }
1821 EXPORT_SYMBOL(dasd_set_feature);
1822
1823 static struct attribute *paths_info_attrs[] = {
1824         &path_fcs_attribute.attr,
1825         NULL,
1826 };
1827
1828 static struct kobj_type path_attr_type = {
1829         .release        = dasd_path_release,
1830         .default_attrs  = paths_info_attrs,
1831         .sysfs_ops      = &kobj_sysfs_ops,
1832 };
1833
1834 static void dasd_path_init_kobj(struct dasd_device *device, int chp)
1835 {
1836         device->path[chp].kobj.kset = device->paths_info;
1837         kobject_init(&device->path[chp].kobj, &path_attr_type);
1838 }
1839
1840 void dasd_path_create_kobj(struct dasd_device *device, int chp)
1841 {
1842         int rc;
1843
1844         if (test_bit(DASD_FLAG_OFFLINE, &device->flags))
1845                 return;
1846         if (!device->paths_info) {
1847                 dev_warn(&device->cdev->dev, "Unable to create paths objects\n");
1848                 return;
1849         }
1850         if (device->path[chp].in_sysfs)
1851                 return;
1852         if (!device->path[chp].conf_data)
1853                 return;
1854
1855         dasd_path_init_kobj(device, chp);
1856
1857         rc = kobject_add(&device->path[chp].kobj, NULL, "%x.%02x",
1858                          device->path[chp].cssid, device->path[chp].chpid);
1859         if (rc)
1860                 kobject_put(&device->path[chp].kobj);
1861         device->path[chp].in_sysfs = true;
1862 }
1863 EXPORT_SYMBOL(dasd_path_create_kobj);
1864
1865 void dasd_path_create_kobjects(struct dasd_device *device)
1866 {
1867         u8 lpm, opm;
1868
1869         opm = dasd_path_get_opm(device);
1870         for (lpm = 0x80; lpm; lpm >>= 1) {
1871                 if (!(lpm & opm))
1872                         continue;
1873                 dasd_path_create_kobj(device, pathmask_to_pos(lpm));
1874         }
1875 }
1876 EXPORT_SYMBOL(dasd_path_create_kobjects);
1877
1878 static void dasd_path_remove_kobj(struct dasd_device *device, int chp)
1879 {
1880         if (device->path[chp].in_sysfs) {
1881                 kobject_put(&device->path[chp].kobj);
1882                 device->path[chp].in_sysfs = false;
1883         }
1884 }
1885
1886 /*
1887  * As we keep kobjects for the lifetime of a device, this function must not be
1888  * called anywhere but in the context of offlining a device.
1889  */
1890 void dasd_path_remove_kobjects(struct dasd_device *device)
1891 {
1892         int i;
1893
1894         for (i = 0; i < 8; i++)
1895                 dasd_path_remove_kobj(device, i);
1896 }
1897 EXPORT_SYMBOL(dasd_path_remove_kobjects);
1898
1899 int
1900 dasd_devmap_init(void)
1901 {
1902         int i;
1903
1904         /* Initialize devmap structures. */
1905         dasd_max_devindex = 0;
1906         for (i = 0; i < 256; i++)
1907                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1908         return 0;
1909 }
1910
1911 void
1912 dasd_devmap_exit(void)
1913 {
1914         dasd_forget_ranges();
1915 }