drivers/s390/block/dasd_devmap.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999,2001
   8  *
   9  * Device mapping and dasd= parameter parsing functions. All devmap
  10  * functions may not be called from interrupt context. In particular
  11  * dasd_get_device is a no-no from interrupt context.
  12  *
  13  */
  14
  15 #define KMSG_COMPONENT "dasd"
  16
  17 #include <linux/ctype.h>
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21
  22 #include <asm/debug.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/ipl.h>
  25
  26 /* This is ugly... */
  27 #define PRINTK_HEADER "dasd_devmap:"
  28 #define DASD_BUS_ID_SIZE 20
  29
  30 #include "dasd_int.h"
  31
  32 struct kmem_cache *dasd_page_cache;
  33 EXPORT_SYMBOL_GPL(dasd_page_cache);
  34
  35 /*
  36  * dasd_devmap_t is used to store the features and the relation
  37  * between device number and device index. To find a dasd_devmap_t
  38  * that corresponds to a device number of a device index each
  39  * dasd_devmap_t is added to two linked lists, one to search by
  40  * the device number and one to search by the device index. As
  41  * soon as big minor numbers are available the device index list
  42  * can be removed since the device number will then be identical
  43  * to the device index.
  44  */
  45 struct dasd_devmap {
  46         struct list_head list;
  47         char bus_id[DASD_BUS_ID_SIZE];
  48         unsigned int devindex;
  49         unsigned short features;
  50         struct dasd_device *device;
  51 };
  52
  53 /*
  54  * Parameter parsing functions for dasd= parameter. The syntax is:
  55  *   <devno>            : (0x)?[0-9a-fA-F]+
  56  *   <busid>            : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
  57  *   <feature>          : ro
  58  *   <feature_list>     : \(<feature>(:<feature>)*\)
  59  *   <devno-range>      : <devno>(-<devno>)?<feature_list>?
  60  *   <busid-range>      : <busid>(-<busid>)?<feature_list>?
  61  *   <devices>          : <devno-range>|<busid-range>
  62  *   <dasd_module>      : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
  63  *
  64  *   <dasd>             : autodetect|probeonly|<devices>(,<devices>)*
  65  */
  66
  67 int dasd_probeonly =  0;        /* is true, when probeonly mode is active */
  68 int dasd_autodetect = 0;        /* is true, when autodetection is active */
  69 int dasd_nopav = 0;             /* is true, when PAV is disabled */
  70 EXPORT_SYMBOL_GPL(dasd_nopav);
  71 int dasd_nofcx;                 /* disable High Performance Ficon */
  72 EXPORT_SYMBOL_GPL(dasd_nofcx);
  73
  74 /*
  75  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
  76  * it is named 'dasd' to directly be filled by insmod with the comma separated
  77  * strings when running as a module.
  78  */
  79 static char *dasd[256];
  80 module_param_array(dasd, charp, NULL, S_IRUGO);
  81
  82 /*
  83  * Single spinlock to protect devmap and servermap structures and lists.
  84  */
  85 static DEFINE_SPINLOCK(dasd_devmap_lock);
  86
  87 /*
  88  * Hash lists for devmap structures.
  89  */
  90 static struct list_head dasd_hashlists[256];
  91 int dasd_max_devindex;
  92
  93 static struct dasd_devmap *dasd_add_busid(const char *, int);
  94
  95 static inline int
  96 dasd_hash_busid(const char *bus_id)
  97 {
  98         int hash, i;
  99
 100         hash = 0;
 101         for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
 102                 hash += *bus_id;
 103         return hash & 0xff;
 104 }
 105
 106 #ifndef MODULE
 107 /*
 108  * The parameter parsing functions for builtin-drivers are called
 109  * before kmalloc works. Store the pointers to the parameters strings
 110  * into dasd[] for later processing.
 111  */
 112 static int __init
 113 dasd_call_setup(char *str)
 114 {
 115         static int count = 0;
 116
 117         if (count < 256)
 118                 dasd[count++] = str;
 119         return 1;
 120 }
 121
 122 __setup ("dasd=", dasd_call_setup);
 123 #endif  /* #ifndef MODULE */
 124
 125 #define DASD_IPLDEV     "ipldev"
 126
 127 /*
 128  * Read a device busid/devno from a string.
 129  */
 130 static int
 131
 132 dasd_busid(char **str, int *id0, int *id1, int *devno)
 133 {
 134         int val, old_style;
 135
 136         /* Interpret ipldev busid */
 137         if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
 138                 if (ipl_info.type != IPL_TYPE_CCW) {
 139                         pr_err("The IPL device is not a CCW device\n");
 140                         return -EINVAL;
 141                 }
 142                 *id0 = 0;
 143                 *id1 = ipl_info.data.ccw.dev_id.ssid;
 144                 *devno = ipl_info.data.ccw.dev_id.devno;
 145                 *str += strlen(DASD_IPLDEV);
 146
 147                 return 0;
 148         }
 149         /* check for leading '0x' */
 150         old_style = 0;
 151         if ((*str)[0] == '0' && (*str)[1] == 'x') {
 152                 *str += 2;
 153                 old_style = 1;
 154         }
 155         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 156                 return -EINVAL;
 157         val = simple_strtoul(*str, str, 16);
 158         if (old_style || (*str)[0] != '.') {
 159                 *id0 = *id1 = 0;
 160                 if (val < 0 || val > 0xffff)
 161                         return -EINVAL;
 162                 *devno = val;
 163                 return 0;
 164         }
 165         /* New style x.y.z busid */
 166         if (val < 0 || val > 0xff)
 167                 return -EINVAL;
 168         *id0 = val;
 169         (*str)++;
 170         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 171                 return -EINVAL;
 172         val = simple_strtoul(*str, str, 16);
 173         if (val < 0 || val > 0xff || (*str)++[0] != '.')
 174                 return -EINVAL;
 175         *id1 = val;
 176         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 177                 return -EINVAL;
 178         val = simple_strtoul(*str, str, 16);
 179         if (val < 0 || val > 0xffff)
 180                 return -EINVAL;
 181         *devno = val;
 182         return 0;
 183 }
 184
 185 /*
 186  * Read colon separated list of dasd features. Currently there is
 187  * only one: "ro" for read-only devices. The default feature set
 188  * is empty (value 0).
 189  */
 190 static int
 191 dasd_feature_list(char *str, char **endp)
 192 {
 193         int features, len, rc;
 194
 195         rc = 0;
 196         if (*str != '(') {
 197                 *endp = str;
 198                 return DASD_FEATURE_DEFAULT;
 199         }
 200         str++;
 201         features = 0;
 202
 203         while (1) {
 204                 for (len = 0;
 205                      str[len] && str[len] != ':' && str[len] != ')'; len++);
 206                 if (len == 2 && !strncmp(str, "ro", 2))
 207                         features |= DASD_FEATURE_READONLY;
 208                 else if (len == 4 && !strncmp(str, "diag", 4))
 209                         features |= DASD_FEATURE_USEDIAG;
 210                 else if (len == 3 && !strncmp(str, "raw", 3))
 211                         features |= DASD_FEATURE_USERAW;
 212                 else if (len == 6 && !strncmp(str, "erplog", 6))
 213                         features |= DASD_FEATURE_ERPLOG;
 214                 else if (len == 8 && !strncmp(str, "failfast", 8))
 215                         features |= DASD_FEATURE_FAILFAST;
 216                 else {
 217                         pr_warn("%*s is not a supported device option\n",
 218                                 len, str);
 219                         rc = -EINVAL;
 220                 }
 221                 str += len;
 222                 if (*str != ':')
 223                         break;
 224                 str++;
 225         }
 226         if (*str != ')') {
 227                 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
 228                 rc = -EINVAL;
 229         } else
 230                 str++;
 231         *endp = str;
 232         if (rc != 0)
 233                 return rc;
 234         return features;
 235 }
 236
 237 /*
 238  * Try to match the first element on the comma separated parse string
 239  * with one of the known keywords. If a keyword is found, take the approprate
 240  * action and return a pointer to the residual string. If the first element
 241  * could not be matched to any keyword then return an error code.
 242  */
 243 static char *
 244 dasd_parse_keyword( char *parsestring ) {
 245
 246         char *nextcomma, *residual_str;
 247         int length;
 248
 249         nextcomma = strchr(parsestring,',');
 250         if (nextcomma) {
 251                 length = nextcomma - parsestring;
 252                 residual_str = nextcomma + 1;
 253         } else {
 254                 length = strlen(parsestring);
 255                 residual_str = parsestring + length;
 256         }
 257         if (strncmp("autodetect", parsestring, length) == 0) {
 258                 dasd_autodetect = 1;
 259                 pr_info("The autodetection mode has been activated\n");
 260                 return residual_str;
 261         }
 262         if (strncmp("probeonly", parsestring, length) == 0) {
 263                 dasd_probeonly = 1;
 264                 pr_info("The probeonly mode has been activated\n");
 265                 return residual_str;
 266         }
 267         if (strncmp("nopav", parsestring, length) == 0) {
 268                 if (MACHINE_IS_VM)
 269                         pr_info("'nopav' is not supported on z/VM\n");
 270                 else {
 271                         dasd_nopav = 1;
 272                         pr_info("PAV support has be deactivated\n");
 273                 }
 274                 return residual_str;
 275         }
 276         if (strncmp("nofcx", parsestring, length) == 0) {
 277                 dasd_nofcx = 1;
 278                 pr_info("High Performance FICON support has been "
 279                         "deactivated\n");
 280                 return residual_str;
 281         }
 282         if (strncmp("fixedbuffers", parsestring, length) == 0) {
 283                 if (dasd_page_cache)
 284                         return residual_str;
 285                 dasd_page_cache =
 286                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
 287                                           PAGE_SIZE, SLAB_CACHE_DMA,
 288                                           NULL);
 289                 if (!dasd_page_cache)
 290                         DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
 291                                 "fixed buffer mode disabled.");
 292                 else
 293                         DBF_EVENT(DBF_INFO, "%s",
 294                                  "turning on fixed buffer mode");
 295                 return residual_str;
 296         }
 297         return ERR_PTR(-EINVAL);
 298 }
 299
 300 /*
 301  * Try to interprete the first element on the comma separated parse string
 302  * as a device number or a range of devices. If the interpretation is
 303  * successful, create the matching dasd_devmap entries and return a pointer
 304  * to the residual string.
 305  * If interpretation fails or in case of an error, return an error code.
 306  */
 307 static char *
 308 dasd_parse_range( char *parsestring ) {
 309
 310         struct dasd_devmap *devmap;
 311         int from, from_id0, from_id1;
 312         int to, to_id0, to_id1;
 313         int features, rc;
 314         char bus_id[DASD_BUS_ID_SIZE+1], *str;
 315
 316         str = parsestring;
 317         rc = dasd_busid(&str, &from_id0, &from_id1, &from);
 318         if (rc == 0) {
 319                 to = from;
 320                 to_id0 = from_id0;
 321                 to_id1 = from_id1;
 322                 if (*str == '-') {
 323                         str++;
 324                         rc = dasd_busid(&str, &to_id0, &to_id1, &to);
 325                 }
 326         }
 327         if (rc == 0 &&
 328             (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
 329                 rc = -EINVAL;
 330         if (rc) {
 331                 pr_err("%s is not a valid device range\n", parsestring);
 332                 return ERR_PTR(rc);
 333         }
 334         features = dasd_feature_list(str, &str);
 335         if (features < 0)
 336                 return ERR_PTR(-EINVAL);
 337         /* each device in dasd= parameter should be set initially online */
 338         features |= DASD_FEATURE_INITIAL_ONLINE;
 339         while (from <= to) {
 340                 sprintf(bus_id, "%01x.%01x.%04x",
 341                         from_id0, from_id1, from++);
 342                 devmap = dasd_add_busid(bus_id, features);
 343                 if (IS_ERR(devmap))
 344                         return (char *)devmap;
 345         }
 346         if (*str == ',')
 347                 return str + 1;
 348         if (*str == '\0')
 349                 return str;
 350         pr_warn("The dasd= parameter value %s has an invalid ending\n", str);
 351         return ERR_PTR(-EINVAL);
 352 }
 353
 354 static char *
 355 dasd_parse_next_element( char *parsestring ) {
 356         char * residual_str;
 357         residual_str = dasd_parse_keyword(parsestring);
 358         if (!IS_ERR(residual_str))
 359                 return residual_str;
 360         residual_str = dasd_parse_range(parsestring);
 361         return residual_str;
 362 }
 363
 364 /*
 365  * Parse parameters stored in dasd[]
 366  * The 'dasd=...' parameter allows to specify a comma separated list of
 367  * keywords and device ranges. When the dasd driver is build into the kernel,
 368  * the complete list will be stored as one element of the dasd[] array.
 369  * When the dasd driver is build as a module, then the list is broken into
 370  * it's elements and each dasd[] entry contains one element.
 371  */
 372 int
 373 dasd_parse(void)
 374 {
 375         int rc, i;
 376         char *parsestring;
 377
 378         rc = 0;
 379         for (i = 0; i < 256; i++) {
 380                 if (dasd[i] == NULL)
 381                         break;
 382                 parsestring = dasd[i];
 383                 /* loop over the comma separated list in the parsestring */
 384                 while (*parsestring) {
 385                         parsestring = dasd_parse_next_element(parsestring);
 386                         if(IS_ERR(parsestring)) {
 387                                 rc = PTR_ERR(parsestring);
 388                                 break;
 389                         }
 390                 }
 391                 if (rc) {
 392                         DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
 393                         break;
 394                 }
 395         }
 396         return rc;
 397 }
 398
 399 /*
 400  * Add a devmap for the device specified by busid. It is possible that
 401  * the devmap already exists (dasd= parameter). The order of the devices
 402  * added through this function will define the kdevs for the individual
 403  * devices.
 404  */
 405 static struct dasd_devmap *
 406 dasd_add_busid(const char *bus_id, int features)
 407 {
 408         struct dasd_devmap *devmap, *new, *tmp;
 409         int hash;
 410
 411         new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
 412         if (!new)
 413                 return ERR_PTR(-ENOMEM);
 414         spin_lock(&dasd_devmap_lock);
 415         devmap = NULL;
 416         hash = dasd_hash_busid(bus_id);
 417         list_for_each_entry(tmp, &dasd_hashlists[hash], list)
 418                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 419                         devmap = tmp;
 420                         break;
 421                 }
 422         if (!devmap) {
 423                 /* This bus_id is new. */
 424                 new->devindex = dasd_max_devindex++;
 425                 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
 426                 new->features = features;
 427                 new->device = NULL;
 428                 list_add(&new->list, &dasd_hashlists[hash]);
 429                 devmap = new;
 430                 new = NULL;
 431         }
 432         spin_unlock(&dasd_devmap_lock);
 433         kfree(new);
 434         return devmap;
 435 }
 436
 437 /*
 438  * Find devmap for device with given bus_id.
 439  */
 440 static struct dasd_devmap *
 441 dasd_find_busid(const char *bus_id)
 442 {
 443         struct dasd_devmap *devmap, *tmp;
 444         int hash;
 445
 446         spin_lock(&dasd_devmap_lock);
 447         devmap = ERR_PTR(-ENODEV);
 448         hash = dasd_hash_busid(bus_id);
 449         list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
 450                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 451                         devmap = tmp;
 452                         break;
 453                 }
 454         }
 455         spin_unlock(&dasd_devmap_lock);
 456         return devmap;
 457 }
 458
 459 /*
 460  * Check if busid has been added to the list of dasd ranges.
 461  */
 462 int
 463 dasd_busid_known(const char *bus_id)
 464 {
 465         return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
 466 }
 467
 468 /*
 469  * Forget all about the device numbers added so far.
 470  * This may only be called at module unload or system shutdown.
 471  */
 472 static void
 473 dasd_forget_ranges(void)
 474 {
 475         struct dasd_devmap *devmap, *n;
 476         int i;
 477
 478         spin_lock(&dasd_devmap_lock);
 479         for (i = 0; i < 256; i++) {
 480                 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
 481                         BUG_ON(devmap->device != NULL);
 482                         list_del(&devmap->list);
 483                         kfree(devmap);
 484                 }
 485         }
 486         spin_unlock(&dasd_devmap_lock);
 487 }
 488
 489 /*
 490  * Find the device struct by its device index.
 491  */
 492 struct dasd_device *
 493 dasd_device_from_devindex(int devindex)
 494 {
 495         struct dasd_devmap *devmap, *tmp;
 496         struct dasd_device *device;
 497         int i;
 498
 499         spin_lock(&dasd_devmap_lock);
 500         devmap = NULL;
 501         for (i = 0; (i < 256) && !devmap; i++)
 502                 list_for_each_entry(tmp, &dasd_hashlists[i], list)
 503                         if (tmp->devindex == devindex) {
 504                                 /* Found the devmap for the device. */
 505                                 devmap = tmp;
 506                                 break;
 507                         }
 508         if (devmap && devmap->device) {
 509                 device = devmap->device;
 510                 dasd_get_device(device);
 511         } else
 512                 device = ERR_PTR(-ENODEV);
 513         spin_unlock(&dasd_devmap_lock);
 514         return device;
 515 }
 516
 517 /*
 518  * Return devmap for cdev. If no devmap exists yet, create one and
 519  * connect it to the cdev.
 520  */
 521 static struct dasd_devmap *
 522 dasd_devmap_from_cdev(struct ccw_device *cdev)
 523 {
 524         struct dasd_devmap *devmap;
 525
 526         devmap = dasd_find_busid(dev_name(&cdev->dev));
 527         if (IS_ERR(devmap))
 528                 devmap = dasd_add_busid(dev_name(&cdev->dev),
 529                                         DASD_FEATURE_DEFAULT);
 530         return devmap;
 531 }
 532
 533 /*
 534  * Create a dasd device structure for cdev.
 535  */
 536 struct dasd_device *
 537 dasd_create_device(struct ccw_device *cdev)
 538 {
 539         struct dasd_devmap *devmap;
 540         struct dasd_device *device;
 541         unsigned long flags;
 542         int rc;
 543
 544         devmap = dasd_devmap_from_cdev(cdev);
 545         if (IS_ERR(devmap))
 546                 return (void *) devmap;
 547
 548         device = dasd_alloc_device();
 549         if (IS_ERR(device))
 550                 return device;
 551         atomic_set(&device->ref_count, 3);
 552
 553         spin_lock(&dasd_devmap_lock);
 554         if (!devmap->device) {
 555                 devmap->device = device;
 556                 device->devindex = devmap->devindex;
 557                 device->features = devmap->features;
 558                 get_device(&cdev->dev);
 559                 device->cdev = cdev;
 560                 rc = 0;
 561         } else
 562                 /* Someone else was faster. */
 563                 rc = -EBUSY;
 564         spin_unlock(&dasd_devmap_lock);
 565
 566         if (rc) {
 567                 dasd_free_device(device);
 568                 return ERR_PTR(rc);
 569         }
 570
 571         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 572         dev_set_drvdata(&cdev->dev, device);
 573         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 574
 575         return device;
 576 }
 577
 578 /*
 579  * Wait queue for dasd_delete_device waits.
 580  */
 581 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
 582
 583 /*
 584  * Remove a dasd device structure. The passed referenced
 585  * is destroyed.
 586  */
 587 void
 588 dasd_delete_device(struct dasd_device *device)
 589 {
 590         struct ccw_device *cdev;
 591         struct dasd_devmap *devmap;
 592         unsigned long flags;
 593
 594         /* First remove device pointer from devmap. */
 595         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 596         BUG_ON(IS_ERR(devmap));
 597         spin_lock(&dasd_devmap_lock);
 598         if (devmap->device != device) {
 599                 spin_unlock(&dasd_devmap_lock);
 600                 dasd_put_device(device);
 601                 return;
 602         }
 603         devmap->device = NULL;
 604         spin_unlock(&dasd_devmap_lock);
 605
 606         /* Disconnect dasd_device structure from ccw_device structure. */
 607         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 608         dev_set_drvdata(&device->cdev->dev, NULL);
 609         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 610
 611         /*
 612          * Drop ref_count by 3, one for the devmap reference, one for
 613          * the cdev reference and one for the passed reference.
 614          */
 615         atomic_sub(3, &device->ref_count);
 616
 617         /* Wait for reference counter to drop to zero. */
 618         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 619
 620         /* Disconnect dasd_device structure from ccw_device structure. */
 621         cdev = device->cdev;
 622         device->cdev = NULL;
 623
 624         /* Put ccw_device structure. */
 625         put_device(&cdev->dev);
 626
 627         /* Now the device structure can be freed. */
 628         dasd_free_device(device);
 629 }
 630
 631 /*
 632  * Reference counter dropped to zero. Wake up waiter
 633  * in dasd_delete_device.
 634  */
 635 void
 636 dasd_put_device_wake(struct dasd_device *device)
 637 {
 638         wake_up(&dasd_delete_wq);
 639 }
 640 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
 641
 642 /*
 643  * Return dasd_device structure associated with cdev.
 644  * This function needs to be called with the ccw device
 645  * lock held. It can be used from interrupt context.
 646  */
 647 struct dasd_device *
 648 dasd_device_from_cdev_locked(struct ccw_device *cdev)
 649 {
 650         struct dasd_device *device = dev_get_drvdata(&cdev->dev);
 651
 652         if (!device)
 653                 return ERR_PTR(-ENODEV);
 654         dasd_get_device(device);
 655         return device;
 656 }
 657
 658 /*
 659  * Return dasd_device structure associated with cdev.
 660  */
 661 struct dasd_device *
 662 dasd_device_from_cdev(struct ccw_device *cdev)
 663 {
 664         struct dasd_device *device;
 665         unsigned long flags;
 666
 667         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 668         device = dasd_device_from_cdev_locked(cdev);
 669         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 670         return device;
 671 }
 672
 673 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
 674 {
 675         struct dasd_devmap *devmap;
 676
 677         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 678         if (IS_ERR(devmap))
 679                 return;
 680         spin_lock(&dasd_devmap_lock);
 681         gdp->private_data = devmap;
 682         spin_unlock(&dasd_devmap_lock);
 683 }
 684
 685 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
 686 {
 687         struct dasd_device *device;
 688         struct dasd_devmap *devmap;
 689
 690         if (!gdp->private_data)
 691                 return NULL;
 692         device = NULL;
 693         spin_lock(&dasd_devmap_lock);
 694         devmap = gdp->private_data;
 695         if (devmap && devmap->device) {
 696                 device = devmap->device;
 697                 dasd_get_device(device);
 698         }
 699         spin_unlock(&dasd_devmap_lock);
 700         return device;
 701 }
 702
 703 /*
 704  * SECTION: files in sysfs
 705  */
 706
 707 /*
 708  * failfast controls the behaviour, if no path is available
 709  */
 710 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
 711                             char *buf)
 712 {
 713         struct dasd_devmap *devmap;
 714         int ff_flag;
 715
 716         devmap = dasd_find_busid(dev_name(dev));
 717         if (!IS_ERR(devmap))
 718                 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
 719         else
 720                 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
 721         return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
 722 }
 723
 724 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
 725               const char *buf, size_t count)
 726 {
 727         struct dasd_devmap *devmap;
 728         int val;
 729         char *endp;
 730
 731         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 732         if (IS_ERR(devmap))
 733                 return PTR_ERR(devmap);
 734
 735         val = simple_strtoul(buf, &endp, 0);
 736         if (((endp + 1) < (buf + count)) || (val > 1))
 737                 return -EINVAL;
 738
 739         spin_lock(&dasd_devmap_lock);
 740         if (val)
 741                 devmap->features |= DASD_FEATURE_FAILFAST;
 742         else
 743                 devmap->features &= ~DASD_FEATURE_FAILFAST;
 744         if (devmap->device)
 745                 devmap->device->features = devmap->features;
 746         spin_unlock(&dasd_devmap_lock);
 747         return count;
 748 }
 749
 750 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
 751
 752 /*
 753  * readonly controls the readonly status of a dasd
 754  */
 755 static ssize_t
 756 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 757 {
 758         struct dasd_devmap *devmap;
 759         int ro_flag;
 760
 761         devmap = dasd_find_busid(dev_name(dev));
 762         if (!IS_ERR(devmap))
 763                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
 764         else
 765                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
 766         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 767 }
 768
 769 static ssize_t
 770 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 771               const char *buf, size_t count)
 772 {
 773         struct dasd_devmap *devmap;
 774         struct dasd_device *device;
 775         int val;
 776         char *endp;
 777
 778         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 779         if (IS_ERR(devmap))
 780                 return PTR_ERR(devmap);
 781
 782         val = simple_strtoul(buf, &endp, 0);
 783         if (((endp + 1) < (buf + count)) || (val > 1))
 784                 return -EINVAL;
 785
 786         spin_lock(&dasd_devmap_lock);
 787         if (val)
 788                 devmap->features |= DASD_FEATURE_READONLY;
 789         else
 790                 devmap->features &= ~DASD_FEATURE_READONLY;
 791         device = devmap->device;
 792         if (device) {
 793                 device->features = devmap->features;
 794                 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 795         }
 796         spin_unlock(&dasd_devmap_lock);
 797         if (device && device->block && device->block->gdp)
 798                 set_disk_ro(device->block->gdp, val);
 799         return count;
 800 }
 801
 802 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 803 /*
 804  * erplog controls the logging of ERP related data
 805  * (e.g. failing channel programs).
 806  */
 807 static ssize_t
 808 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 809 {
 810         struct dasd_devmap *devmap;
 811         int erplog;
 812
 813         devmap = dasd_find_busid(dev_name(dev));
 814         if (!IS_ERR(devmap))
 815                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 816         else
 817                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 818         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 819 }
 820
 821 static ssize_t
 822 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 823               const char *buf, size_t count)
 824 {
 825         struct dasd_devmap *devmap;
 826         int val;
 827         char *endp;
 828
 829         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 830         if (IS_ERR(devmap))
 831                 return PTR_ERR(devmap);
 832
 833         val = simple_strtoul(buf, &endp, 0);
 834         if (((endp + 1) < (buf + count)) || (val > 1))
 835                 return -EINVAL;
 836
 837         spin_lock(&dasd_devmap_lock);
 838         if (val)
 839                 devmap->features |= DASD_FEATURE_ERPLOG;
 840         else
 841                 devmap->features &= ~DASD_FEATURE_ERPLOG;
 842         if (devmap->device)
 843                 devmap->device->features = devmap->features;
 844         spin_unlock(&dasd_devmap_lock);
 845         return count;
 846 }
 847
 848 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 849
 850 /*
 851  * use_diag controls whether the driver should use diag rather than ssch
 852  * to talk to the device
 853  */
 854 static ssize_t
 855 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 856 {
 857         struct dasd_devmap *devmap;
 858         int use_diag;
 859
 860         devmap = dasd_find_busid(dev_name(dev));
 861         if (!IS_ERR(devmap))
 862                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 863         else
 864                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 865         return sprintf(buf, use_diag ? "1\n" : "0\n");
 866 }
 867
 868 static ssize_t
 869 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 870                     const char *buf, size_t count)
 871 {
 872         struct dasd_devmap *devmap;
 873         ssize_t rc;
 874         int val;
 875         char *endp;
 876
 877         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 878         if (IS_ERR(devmap))
 879                 return PTR_ERR(devmap);
 880
 881         val = simple_strtoul(buf, &endp, 0);
 882         if (((endp + 1) < (buf + count)) || (val > 1))
 883                 return -EINVAL;
 884
 885         spin_lock(&dasd_devmap_lock);
 886         /* Changing diag discipline flag is only allowed in offline state. */
 887         rc = count;
 888         if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
 889                 if (val)
 890                         devmap->features |= DASD_FEATURE_USEDIAG;
 891                 else
 892                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 893         } else
 894                 rc = -EPERM;
 895         spin_unlock(&dasd_devmap_lock);
 896         return rc;
 897 }
 898
 899 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 900
 901 /*
 902  * use_raw controls whether the driver should give access to raw eckd data or
 903  * operate in standard mode
 904  */
 905 static ssize_t
 906 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
 907 {
 908         struct dasd_devmap *devmap;
 909         int use_raw;
 910
 911         devmap = dasd_find_busid(dev_name(dev));
 912         if (!IS_ERR(devmap))
 913                 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
 914         else
 915                 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
 916         return sprintf(buf, use_raw ? "1\n" : "0\n");
 917 }
 918
 919 static ssize_t
 920 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
 921                     const char *buf, size_t count)
 922 {
 923         struct dasd_devmap *devmap;
 924         ssize_t rc;
 925         unsigned long val;
 926
 927         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 928         if (IS_ERR(devmap))
 929                 return PTR_ERR(devmap);
 930
 931         if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
 932                 return -EINVAL;
 933
 934         spin_lock(&dasd_devmap_lock);
 935         /* Changing diag discipline flag is only allowed in offline state. */
 936         rc = count;
 937         if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
 938                 if (val)
 939                         devmap->features |= DASD_FEATURE_USERAW;
 940                 else
 941                         devmap->features &= ~DASD_FEATURE_USERAW;
 942         } else
 943                 rc = -EPERM;
 944         spin_unlock(&dasd_devmap_lock);
 945         return rc;
 946 }
 947
 948 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
 949                    dasd_use_raw_store);
 950
 951 static ssize_t
 952 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
 953                         const char *buf, size_t count)
 954 {
 955         struct ccw_device *cdev = to_ccwdev(dev);
 956         struct dasd_device *device;
 957         int rc;
 958
 959         device = dasd_device_from_cdev(cdev);
 960         if (IS_ERR(device)) {
 961                 rc = PTR_ERR(device);
 962                 goto out;
 963         }
 964
 965         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
 966             test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
 967                 /* Already doing offline processing */
 968                 dasd_put_device(device);
 969                 rc = -EBUSY;
 970                 goto out;
 971         }
 972
 973         set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
 974         dasd_put_device(device);
 975
 976         rc = ccw_device_set_offline(cdev);
 977
 978 out:
 979         return rc ? rc : count;
 980 }
 981
 982 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
 983
 984 static ssize_t
 985 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
 986                      char *buf)
 987 {
 988         struct dasd_device *device;
 989         ssize_t len;
 990
 991         device = dasd_device_from_cdev(to_ccwdev(dev));
 992         if (IS_ERR(device))
 993                 goto out;
 994         else if (!device->discipline) {
 995                 dasd_put_device(device);
 996                 goto out;
 997         } else {
 998                 len = snprintf(buf, PAGE_SIZE, "%s\n",
 999                                device->discipline->name);
1000                 dasd_put_device(device);
1001                 return len;
1002         }
1003 out:
1004         len = snprintf(buf, PAGE_SIZE, "none\n");
1005         return len;
1006 }
1007
1008 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1009
1010 static ssize_t
1011 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1012                      char *buf)
1013 {
1014         struct dasd_device *device;
1015         ssize_t len;
1016
1017         device = dasd_device_from_cdev(to_ccwdev(dev));
1018         if (!IS_ERR(device)) {
1019                 switch (device->state) {
1020                 case DASD_STATE_NEW:
1021                         len = snprintf(buf, PAGE_SIZE, "new\n");
1022                         break;
1023                 case DASD_STATE_KNOWN:
1024                         len = snprintf(buf, PAGE_SIZE, "detected\n");
1025                         break;
1026                 case DASD_STATE_BASIC:
1027                         len = snprintf(buf, PAGE_SIZE, "basic\n");
1028                         break;
1029                 case DASD_STATE_UNFMT:
1030                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1031                         break;
1032                 case DASD_STATE_READY:
1033                         len = snprintf(buf, PAGE_SIZE, "ready\n");
1034                         break;
1035                 case DASD_STATE_ONLINE:
1036                         len = snprintf(buf, PAGE_SIZE, "online\n");
1037                         break;
1038                 default:
1039                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
1040                         break;
1041                 }
1042                 dasd_put_device(device);
1043         } else
1044                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1045         return len;
1046 }
1047
1048 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1049
1050 static ssize_t dasd_alias_show(struct device *dev,
1051                                struct device_attribute *attr, char *buf)
1052 {
1053         struct dasd_device *device;
1054         struct dasd_uid uid;
1055
1056         device = dasd_device_from_cdev(to_ccwdev(dev));
1057         if (IS_ERR(device))
1058                 return sprintf(buf, "0\n");
1059
1060         if (device->discipline && device->discipline->get_uid &&
1061             !device->discipline->get_uid(device, &uid)) {
1062                 if (uid.type == UA_BASE_PAV_ALIAS ||
1063                     uid.type == UA_HYPER_PAV_ALIAS) {
1064                         dasd_put_device(device);
1065                         return sprintf(buf, "1\n");
1066                 }
1067         }
1068         dasd_put_device(device);
1069
1070         return sprintf(buf, "0\n");
1071 }
1072
1073 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1074
1075 static ssize_t dasd_vendor_show(struct device *dev,
1076                                 struct device_attribute *attr, char *buf)
1077 {
1078         struct dasd_device *device;
1079         struct dasd_uid uid;
1080         char *vendor;
1081
1082         device = dasd_device_from_cdev(to_ccwdev(dev));
1083         vendor = "";
1084         if (IS_ERR(device))
1085                 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1086
1087         if (device->discipline && device->discipline->get_uid &&
1088             !device->discipline->get_uid(device, &uid))
1089                         vendor = uid.vendor;
1090
1091         dasd_put_device(device);
1092
1093         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1094 }
1095
1096 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1097
1098 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1099                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1100                      /* vduit */ 32 + 1)
1101
1102 static ssize_t
1103 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1104 {
1105         struct dasd_device *device;
1106         struct dasd_uid uid;
1107         char uid_string[UID_STRLEN];
1108         char ua_string[3];
1109
1110         device = dasd_device_from_cdev(to_ccwdev(dev));
1111         uid_string[0] = 0;
1112         if (IS_ERR(device))
1113                 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1114
1115         if (device->discipline && device->discipline->get_uid &&
1116             !device->discipline->get_uid(device, &uid)) {
1117                 switch (uid.type) {
1118                 case UA_BASE_DEVICE:
1119                         snprintf(ua_string, sizeof(ua_string), "%02x",
1120                                  uid.real_unit_addr);
1121                         break;
1122                 case UA_BASE_PAV_ALIAS:
1123                         snprintf(ua_string, sizeof(ua_string), "%02x",
1124                                  uid.base_unit_addr);
1125                         break;
1126                 case UA_HYPER_PAV_ALIAS:
1127                         snprintf(ua_string, sizeof(ua_string), "xx");
1128                         break;
1129                 default:
1130                         /* should not happen, treat like base device */
1131                         snprintf(ua_string, sizeof(ua_string), "%02x",
1132                                  uid.real_unit_addr);
1133                         break;
1134                 }
1135
1136                 if (strlen(uid.vduit) > 0)
1137                         snprintf(uid_string, sizeof(uid_string),
1138                                  "%s.%s.%04x.%s.%s",
1139                                  uid.vendor, uid.serial, uid.ssid, ua_string,
1140                                  uid.vduit);
1141                 else
1142                         snprintf(uid_string, sizeof(uid_string),
1143                                  "%s.%s.%04x.%s",
1144                                  uid.vendor, uid.serial, uid.ssid, ua_string);
1145         }
1146         dasd_put_device(device);
1147
1148         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1149 }
1150 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1151
1152 /*
1153  * extended error-reporting
1154  */
1155 static ssize_t
1156 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1157 {
1158         struct dasd_devmap *devmap;
1159         int eer_flag;
1160
1161         devmap = dasd_find_busid(dev_name(dev));
1162         if (!IS_ERR(devmap) && devmap->device)
1163                 eer_flag = dasd_eer_enabled(devmap->device);
1164         else
1165                 eer_flag = 0;
1166         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1167 }
1168
1169 static ssize_t
1170 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1171                const char *buf, size_t count)
1172 {
1173         struct dasd_devmap *devmap;
1174         int val, rc;
1175         char *endp;
1176
1177         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1178         if (IS_ERR(devmap))
1179                 return PTR_ERR(devmap);
1180         if (!devmap->device)
1181                 return -ENODEV;
1182
1183         val = simple_strtoul(buf, &endp, 0);
1184         if (((endp + 1) < (buf + count)) || (val > 1))
1185                 return -EINVAL;
1186
1187         if (val) {
1188                 rc = dasd_eer_enable(devmap->device);
1189                 if (rc)
1190                         return rc;
1191         } else
1192                 dasd_eer_disable(devmap->device);
1193         return count;
1194 }
1195
1196 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1197
1198 /*
1199  * expiration time for default requests
1200  */
1201 static ssize_t
1202 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1203 {
1204         struct dasd_device *device;
1205         int len;
1206
1207         device = dasd_device_from_cdev(to_ccwdev(dev));
1208         if (IS_ERR(device))
1209                 return -ENODEV;
1210         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1211         dasd_put_device(device);
1212         return len;
1213 }
1214
1215 static ssize_t
1216 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1217                const char *buf, size_t count)
1218 {
1219         struct dasd_device *device;
1220         unsigned long val;
1221
1222         device = dasd_device_from_cdev(to_ccwdev(dev));
1223         if (IS_ERR(device))
1224                 return -ENODEV;
1225
1226         if ((kstrtoul(buf, 10, &val) != 0) ||
1227             (val > DASD_EXPIRES_MAX) || val == 0) {
1228                 dasd_put_device(device);
1229                 return -EINVAL;
1230         }
1231
1232         if (val)
1233                 device->default_expires = val;
1234
1235         dasd_put_device(device);
1236         return count;
1237 }
1238
1239 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1240
1241 static ssize_t
1242 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1243 {
1244         struct dasd_device *device;
1245         int len;
1246
1247         device = dasd_device_from_cdev(to_ccwdev(dev));
1248         if (IS_ERR(device))
1249                 return -ENODEV;
1250         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1251         dasd_put_device(device);
1252         return len;
1253 }
1254
1255 static ssize_t
1256 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1257                    const char *buf, size_t count)
1258 {
1259         struct dasd_device *device;
1260         unsigned long val;
1261
1262         device = dasd_device_from_cdev(to_ccwdev(dev));
1263         if (IS_ERR(device))
1264                 return -ENODEV;
1265
1266         if ((kstrtoul(buf, 10, &val) != 0) ||
1267             (val > DASD_RETRIES_MAX)) {
1268                 dasd_put_device(device);
1269                 return -EINVAL;
1270         }
1271
1272         if (val)
1273                 device->default_retries = val;
1274
1275         dasd_put_device(device);
1276         return count;
1277 }
1278
1279 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1280
1281 static ssize_t
1282 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1283                   char *buf)
1284 {
1285         struct dasd_device *device;
1286         int len;
1287
1288         device = dasd_device_from_cdev(to_ccwdev(dev));
1289         if (IS_ERR(device))
1290                 return -ENODEV;
1291         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1292         dasd_put_device(device);
1293         return len;
1294 }
1295
1296 static ssize_t
1297 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1298                    const char *buf, size_t count)
1299 {
1300         struct dasd_device *device;
1301         struct request_queue *q;
1302         unsigned long val, flags;
1303
1304         device = dasd_device_from_cdev(to_ccwdev(dev));
1305         if (IS_ERR(device) || !device->block)
1306                 return -ENODEV;
1307
1308         if ((kstrtoul(buf, 10, &val) != 0) ||
1309             val > UINT_MAX / HZ) {
1310                 dasd_put_device(device);
1311                 return -EINVAL;
1312         }
1313         q = device->block->request_queue;
1314         if (!q) {
1315                 dasd_put_device(device);
1316                 return -ENODEV;
1317         }
1318         spin_lock_irqsave(&device->block->request_queue_lock, flags);
1319         if (!val)
1320                 blk_queue_rq_timed_out(q, NULL);
1321         else
1322                 blk_queue_rq_timed_out(q, dasd_times_out);
1323
1324         device->blk_timeout = val;
1325
1326         blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1327         spin_unlock_irqrestore(&device->block->request_queue_lock, flags);
1328
1329         dasd_put_device(device);
1330         return count;
1331 }
1332
1333 static DEVICE_ATTR(timeout, 0644,
1334                    dasd_timeout_show, dasd_timeout_store);
1335
1336 static ssize_t dasd_reservation_policy_show(struct device *dev,
1337                                             struct device_attribute *attr,
1338                                             char *buf)
1339 {
1340         struct dasd_devmap *devmap;
1341         int rc = 0;
1342
1343         devmap = dasd_find_busid(dev_name(dev));
1344         if (IS_ERR(devmap)) {
1345                 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1346         } else {
1347                 spin_lock(&dasd_devmap_lock);
1348                 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1349                         rc = snprintf(buf, PAGE_SIZE, "fail\n");
1350                 else
1351                         rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1352                 spin_unlock(&dasd_devmap_lock);
1353         }
1354         return rc;
1355 }
1356
1357 static ssize_t dasd_reservation_policy_store(struct device *dev,
1358                                              struct device_attribute *attr,
1359                                              const char *buf, size_t count)
1360 {
1361         struct dasd_devmap *devmap;
1362         int rc;
1363
1364         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1365         if (IS_ERR(devmap))
1366                 return PTR_ERR(devmap);
1367         rc = 0;
1368         spin_lock(&dasd_devmap_lock);
1369         if (sysfs_streq("ignore", buf))
1370                 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1371         else if (sysfs_streq("fail", buf))
1372                 devmap->features |= DASD_FEATURE_FAILONSLCK;
1373         else
1374                 rc = -EINVAL;
1375         if (devmap->device)
1376                 devmap->device->features = devmap->features;
1377         spin_unlock(&dasd_devmap_lock);
1378         if (rc)
1379                 return rc;
1380         else
1381                 return count;
1382 }
1383
1384 static DEVICE_ATTR(reservation_policy, 0644,
1385                    dasd_reservation_policy_show, dasd_reservation_policy_store);
1386
1387 static ssize_t dasd_reservation_state_show(struct device *dev,
1388                                            struct device_attribute *attr,
1389                                            char *buf)
1390 {
1391         struct dasd_device *device;
1392         int rc = 0;
1393
1394         device = dasd_device_from_cdev(to_ccwdev(dev));
1395         if (IS_ERR(device))
1396                 return snprintf(buf, PAGE_SIZE, "none\n");
1397
1398         if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1399                 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1400         else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1401                 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1402         else
1403                 rc = snprintf(buf, PAGE_SIZE, "none\n");
1404         dasd_put_device(device);
1405         return rc;
1406 }
1407
1408 static ssize_t dasd_reservation_state_store(struct device *dev,
1409                                             struct device_attribute *attr,
1410                                             const char *buf, size_t count)
1411 {
1412         struct dasd_device *device;
1413         int rc = 0;
1414
1415         device = dasd_device_from_cdev(to_ccwdev(dev));
1416         if (IS_ERR(device))
1417                 return -ENODEV;
1418         if (sysfs_streq("reset", buf))
1419                 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1420         else
1421                 rc = -EINVAL;
1422         dasd_put_device(device);
1423
1424         if (rc)
1425                 return rc;
1426         else
1427                 return count;
1428 }
1429
1430 static DEVICE_ATTR(last_known_reservation_state, 0644,
1431                    dasd_reservation_state_show, dasd_reservation_state_store);
1432
1433 static ssize_t dasd_pm_show(struct device *dev,
1434                               struct device_attribute *attr, char *buf)
1435 {
1436         struct dasd_device *device;
1437         u8 opm, nppm, cablepm, cuirpm, hpfpm;
1438
1439         device = dasd_device_from_cdev(to_ccwdev(dev));
1440         if (IS_ERR(device))
1441                 return sprintf(buf, "0\n");
1442
1443         opm = device->path_data.opm;
1444         nppm = device->path_data.npm;
1445         cablepm = device->path_data.cablepm;
1446         cuirpm = device->path_data.cuirpm;
1447         hpfpm = device->path_data.hpfpm;
1448         dasd_put_device(device);
1449
1450         return sprintf(buf, "%02x %02x %02x %02x %02x\n", opm, nppm,
1451                        cablepm, cuirpm, hpfpm);
1452 }
1453
1454 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1455
1456 static struct attribute * dasd_attrs[] = {
1457         &dev_attr_readonly.attr,
1458         &dev_attr_discipline.attr,
1459         &dev_attr_status.attr,
1460         &dev_attr_alias.attr,
1461         &dev_attr_vendor.attr,
1462         &dev_attr_uid.attr,
1463         &dev_attr_use_diag.attr,
1464         &dev_attr_raw_track_access.attr,
1465         &dev_attr_eer_enabled.attr,
1466         &dev_attr_erplog.attr,
1467         &dev_attr_failfast.attr,
1468         &dev_attr_expires.attr,
1469         &dev_attr_retries.attr,
1470         &dev_attr_timeout.attr,
1471         &dev_attr_reservation_policy.attr,
1472         &dev_attr_last_known_reservation_state.attr,
1473         &dev_attr_safe_offline.attr,
1474         &dev_attr_path_masks.attr,
1475         NULL,
1476 };
1477
1478 static struct attribute_group dasd_attr_group = {
1479         .attrs = dasd_attrs,
1480 };
1481
1482 /*
1483  * Return value of the specified feature.
1484  */
1485 int
1486 dasd_get_feature(struct ccw_device *cdev, int feature)
1487 {
1488         struct dasd_devmap *devmap;
1489
1490         devmap = dasd_find_busid(dev_name(&cdev->dev));
1491         if (IS_ERR(devmap))
1492                 return PTR_ERR(devmap);
1493
1494         return ((devmap->features & feature) != 0);
1495 }
1496
1497 /*
1498  * Set / reset given feature.
1499  * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1500  */
1501 int
1502 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1503 {
1504         struct dasd_devmap *devmap;
1505
1506         devmap = dasd_find_busid(dev_name(&cdev->dev));
1507         if (IS_ERR(devmap))
1508                 return PTR_ERR(devmap);
1509
1510         spin_lock(&dasd_devmap_lock);
1511         if (flag)
1512                 devmap->features |= feature;
1513         else
1514                 devmap->features &= ~feature;
1515         if (devmap->device)
1516                 devmap->device->features = devmap->features;
1517         spin_unlock(&dasd_devmap_lock);
1518         return 0;
1519 }
1520
1521
1522 int
1523 dasd_add_sysfs_files(struct ccw_device *cdev)
1524 {
1525         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1526 }
1527
1528 void
1529 dasd_remove_sysfs_files(struct ccw_device *cdev)
1530 {
1531         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1532 }
1533
1534
1535 int
1536 dasd_devmap_init(void)
1537 {
1538         int i;
1539
1540         /* Initialize devmap structures. */
1541         dasd_max_devindex = 0;
1542         for (i = 0; i < 256; i++)
1543                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1544         return 0;
1545 }
1546
1547 void
1548 dasd_devmap_exit(void)
1549 {
1550         dasd_forget_ranges();
1551 }