drivers/s390/block/dasd_devmap.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_devmap.c
   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  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 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 <asm/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
  31 #include "dasd_int.h"
  32
  33 struct kmem_cache *dasd_page_cache;
  34 EXPORT_SYMBOL_GPL(dasd_page_cache);
  35
  36 /*
  37  * dasd_devmap_t is used to store the features and the relation
  38  * between device number and device index. To find a dasd_devmap_t
  39  * that corresponds to a device number of a device index each
  40  * dasd_devmap_t is added to two linked lists, one to search by
  41  * the device number and one to search by the device index. As
  42  * soon as big minor numbers are available the device index list
  43  * can be removed since the device number will then be identical
  44  * to the device index.
  45  */
  46 struct dasd_devmap {
  47         struct list_head list;
  48         char bus_id[DASD_BUS_ID_SIZE];
  49         unsigned int devindex;
  50         unsigned short features;
  51         struct dasd_device *device;
  52 };
  53
  54 /*
  55  * Parameter parsing functions for dasd= parameter. The syntax is:
  56  *   <devno>            : (0x)?[0-9a-fA-F]+
  57  *   <busid>            : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
  58  *   <feature>          : ro
  59  *   <feature_list>     : \(<feature>(:<feature>)*\)
  60  *   <devno-range>      : <devno>(-<devno>)?<feature_list>?
  61  *   <busid-range>      : <busid>(-<busid>)?<feature_list>?
  62  *   <devices>          : <devno-range>|<busid-range>
  63  *   <dasd_module>      : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
  64  *
  65  *   <dasd>             : autodetect|probeonly|<devices>(,<devices>)*
  66  */
  67
  68 int dasd_probeonly =  0;        /* is true, when probeonly mode is active */
  69 int dasd_autodetect = 0;        /* is true, when autodetection is active */
  70 int dasd_nopav = 0;             /* is true, when PAV is disabled */
  71 EXPORT_SYMBOL_GPL(dasd_nopav);
  72 int dasd_nofcx;                 /* disable High Performance Ficon */
  73 EXPORT_SYMBOL_GPL(dasd_nofcx);
  74
  75 /*
  76  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
  77  * it is named 'dasd' to directly be filled by insmod with the comma separated
  78  * strings when running as a module.
  79  */
  80 static char *dasd[256];
  81 module_param_array(dasd, charp, NULL, 0);
  82
  83 /*
  84  * Single spinlock to protect devmap and servermap structures and lists.
  85  */
  86 static DEFINE_SPINLOCK(dasd_devmap_lock);
  87
  88 /*
  89  * Hash lists for devmap structures.
  90  */
  91 static struct list_head dasd_hashlists[256];
  92 int dasd_max_devindex;
  93
  94 static struct dasd_devmap *dasd_add_busid(const char *, int);
  95
  96 static inline int
  97 dasd_hash_busid(const char *bus_id)
  98 {
  99         int hash, i;
 100
 101         hash = 0;
 102         for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
 103                 hash += *bus_id;
 104         return hash & 0xff;
 105 }
 106
 107 #ifndef MODULE
 108 /*
 109  * The parameter parsing functions for builtin-drivers are called
 110  * before kmalloc works. Store the pointers to the parameters strings
 111  * into dasd[] for later processing.
 112  */
 113 static int __init
 114 dasd_call_setup(char *str)
 115 {
 116         static int count = 0;
 117
 118         if (count < 256)
 119                 dasd[count++] = str;
 120         return 1;
 121 }
 122
 123 __setup ("dasd=", dasd_call_setup);
 124 #endif  /* #ifndef MODULE */
 125
 126 #define DASD_IPLDEV     "ipldev"
 127
 128 /*
 129  * Read a device busid/devno from a string.
 130  */
 131 static int
 132
 133 dasd_busid(char **str, int *id0, int *id1, int *devno)
 134 {
 135         int val, old_style;
 136
 137         /* Interpret ipldev busid */
 138         if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
 139                 if (ipl_info.type != IPL_TYPE_CCW) {
 140                         pr_err("The IPL device is not a CCW device\n");
 141                         return -EINVAL;
 142                 }
 143                 *id0 = 0;
 144                 *id1 = ipl_info.data.ccw.dev_id.ssid;
 145                 *devno = ipl_info.data.ccw.dev_id.devno;
 146                 *str += strlen(DASD_IPLDEV);
 147
 148                 return 0;
 149         }
 150         /* check for leading '0x' */
 151         old_style = 0;
 152         if ((*str)[0] == '0' && (*str)[1] == 'x') {
 153                 *str += 2;
 154                 old_style = 1;
 155         }
 156         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 157                 return -EINVAL;
 158         val = simple_strtoul(*str, str, 16);
 159         if (old_style || (*str)[0] != '.') {
 160                 *id0 = *id1 = 0;
 161                 if (val < 0 || val > 0xffff)
 162                         return -EINVAL;
 163                 *devno = val;
 164                 return 0;
 165         }
 166         /* New style x.y.z busid */
 167         if (val < 0 || val > 0xff)
 168                 return -EINVAL;
 169         *id0 = val;
 170         (*str)++;
 171         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 172                 return -EINVAL;
 173         val = simple_strtoul(*str, str, 16);
 174         if (val < 0 || val > 0xff || (*str)++[0] != '.')
 175                 return -EINVAL;
 176         *id1 = val;
 177         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 178                 return -EINVAL;
 179         val = simple_strtoul(*str, str, 16);
 180         if (val < 0 || val > 0xffff)
 181                 return -EINVAL;
 182         *devno = val;
 183         return 0;
 184 }
 185
 186 /*
 187  * Read colon separated list of dasd features. Currently there is
 188  * only one: "ro" for read-only devices. The default feature set
 189  * is empty (value 0).
 190  */
 191 static int
 192 dasd_feature_list(char *str, char **endp)
 193 {
 194         int features, len, rc;
 195
 196         rc = 0;
 197         if (*str != '(') {
 198                 *endp = str;
 199                 return DASD_FEATURE_DEFAULT;
 200         }
 201         str++;
 202         features = 0;
 203
 204         while (1) {
 205                 for (len = 0;
 206                      str[len] && str[len] != ':' && str[len] != ')'; len++);
 207                 if (len == 2 && !strncmp(str, "ro", 2))
 208                         features |= DASD_FEATURE_READONLY;
 209                 else if (len == 4 && !strncmp(str, "diag", 4))
 210                         features |= DASD_FEATURE_USEDIAG;
 211                 else if (len == 3 && !strncmp(str, "raw", 3))
 212                         features |= DASD_FEATURE_USERAW;
 213                 else if (len == 6 && !strncmp(str, "erplog", 6))
 214                         features |= DASD_FEATURE_ERPLOG;
 215                 else if (len == 8 && !strncmp(str, "failfast", 8))
 216                         features |= DASD_FEATURE_FAILFAST;
 217                 else {
 218                         pr_warning("%*s is not a supported device option\n",
 219                                    len, str);
 220                         rc = -EINVAL;
 221                 }
 222                 str += len;
 223                 if (*str != ':')
 224                         break;
 225                 str++;
 226         }
 227         if (*str != ')') {
 228                 pr_warning("A closing parenthesis ')' is missing in the "
 229                            "dasd= parameter\n");
 230                 rc = -EINVAL;
 231         } else
 232                 str++;
 233         *endp = str;
 234         if (rc != 0)
 235                 return rc;
 236         return features;
 237 }
 238
 239 /*
 240  * Try to match the first element on the comma separated parse string
 241  * with one of the known keywords. If a keyword is found, take the approprate
 242  * action and return a pointer to the residual string. If the first element
 243  * could not be matched to any keyword then return an error code.
 244  */
 245 static char *
 246 dasd_parse_keyword( char *parsestring ) {
 247
 248         char *nextcomma, *residual_str;
 249         int length;
 250
 251         nextcomma = strchr(parsestring,',');
 252         if (nextcomma) {
 253                 length = nextcomma - parsestring;
 254                 residual_str = nextcomma + 1;
 255         } else {
 256                 length = strlen(parsestring);
 257                 residual_str = parsestring + length;
 258         }
 259         if (strncmp("autodetect", parsestring, length) == 0) {
 260                 dasd_autodetect = 1;
 261                 pr_info("The autodetection mode has been activated\n");
 262                 return residual_str;
 263         }
 264         if (strncmp("probeonly", parsestring, length) == 0) {
 265                 dasd_probeonly = 1;
 266                 pr_info("The probeonly mode has been activated\n");
 267                 return residual_str;
 268         }
 269         if (strncmp("nopav", parsestring, length) == 0) {
 270                 if (MACHINE_IS_VM)
 271                         pr_info("'nopav' is not supported on z/VM\n");
 272                 else {
 273                         dasd_nopav = 1;
 274                         pr_info("PAV support has be deactivated\n");
 275                 }
 276                 return residual_str;
 277         }
 278         if (strncmp("nofcx", parsestring, length) == 0) {
 279                 dasd_nofcx = 1;
 280                 pr_info("High Performance FICON support has been "
 281                         "deactivated\n");
 282                 return residual_str;
 283         }
 284         if (strncmp("fixedbuffers", parsestring, length) == 0) {
 285                 if (dasd_page_cache)
 286                         return residual_str;
 287                 dasd_page_cache =
 288                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
 289                                           PAGE_SIZE, SLAB_CACHE_DMA,
 290                                           NULL);
 291                 if (!dasd_page_cache)
 292                         DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
 293                                 "fixed buffer mode disabled.");
 294                 else
 295                         DBF_EVENT(DBF_INFO, "%s",
 296                                  "turning on fixed buffer mode");
 297                 return residual_str;
 298         }
 299         return ERR_PTR(-EINVAL);
 300 }
 301
 302 /*
 303  * Try to interprete the first element on the comma separated parse string
 304  * as a device number or a range of devices. If the interpretation is
 305  * successful, create the matching dasd_devmap entries and return a pointer
 306  * to the residual string.
 307  * If interpretation fails or in case of an error, return an error code.
 308  */
 309 static char *
 310 dasd_parse_range( char *parsestring ) {
 311
 312         struct dasd_devmap *devmap;
 313         int from, from_id0, from_id1;
 314         int to, to_id0, to_id1;
 315         int features, rc;
 316         char bus_id[DASD_BUS_ID_SIZE+1], *str;
 317
 318         str = parsestring;
 319         rc = dasd_busid(&str, &from_id0, &from_id1, &from);
 320         if (rc == 0) {
 321                 to = from;
 322                 to_id0 = from_id0;
 323                 to_id1 = from_id1;
 324                 if (*str == '-') {
 325                         str++;
 326                         rc = dasd_busid(&str, &to_id0, &to_id1, &to);
 327                 }
 328         }
 329         if (rc == 0 &&
 330             (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
 331                 rc = -EINVAL;
 332         if (rc) {
 333                 pr_err("%s is not a valid device range\n", parsestring);
 334                 return ERR_PTR(rc);
 335         }
 336         features = dasd_feature_list(str, &str);
 337         if (features < 0)
 338                 return ERR_PTR(-EINVAL);
 339         /* each device in dasd= parameter should be set initially online */
 340         features |= DASD_FEATURE_INITIAL_ONLINE;
 341         while (from <= to) {
 342                 sprintf(bus_id, "%01x.%01x.%04x",
 343                         from_id0, from_id1, from++);
 344                 devmap = dasd_add_busid(bus_id, features);
 345                 if (IS_ERR(devmap))
 346                         return (char *)devmap;
 347         }
 348         if (*str == ',')
 349                 return str + 1;
 350         if (*str == '\0')
 351                 return str;
 352         pr_warning("The dasd= parameter value %s has an invalid ending\n",
 353                    str);
 354         return ERR_PTR(-EINVAL);
 355 }
 356
 357 static char *
 358 dasd_parse_next_element( char *parsestring ) {
 359         char * residual_str;
 360         residual_str = dasd_parse_keyword(parsestring);
 361         if (!IS_ERR(residual_str))
 362                 return residual_str;
 363         residual_str = dasd_parse_range(parsestring);
 364         return residual_str;
 365 }
 366
 367 /*
 368  * Parse parameters stored in dasd[]
 369  * The 'dasd=...' parameter allows to specify a comma separated list of
 370  * keywords and device ranges. When the dasd driver is build into the kernel,
 371  * the complete list will be stored as one element of the dasd[] array.
 372  * When the dasd driver is build as a module, then the list is broken into
 373  * it's elements and each dasd[] entry contains one element.
 374  */
 375 int
 376 dasd_parse(void)
 377 {
 378         int rc, i;
 379         char *parsestring;
 380
 381         rc = 0;
 382         for (i = 0; i < 256; i++) {
 383                 if (dasd[i] == NULL)
 384                         break;
 385                 parsestring = dasd[i];
 386                 /* loop over the comma separated list in the parsestring */
 387                 while (*parsestring) {
 388                         parsestring = dasd_parse_next_element(parsestring);
 389                         if(IS_ERR(parsestring)) {
 390                                 rc = PTR_ERR(parsestring);
 391                                 break;
 392                         }
 393                 }
 394                 if (rc) {
 395                         DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
 396                         break;
 397                 }
 398         }
 399         return rc;
 400 }
 401
 402 /*
 403  * Add a devmap for the device specified by busid. It is possible that
 404  * the devmap already exists (dasd= parameter). The order of the devices
 405  * added through this function will define the kdevs for the individual
 406  * devices.
 407  */
 408 static struct dasd_devmap *
 409 dasd_add_busid(const char *bus_id, int features)
 410 {
 411         struct dasd_devmap *devmap, *new, *tmp;
 412         int hash;
 413
 414         new = (struct dasd_devmap *)
 415                 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                 strncpy(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         return device;
 580 }
 581
 582 /*
 583  * Wait queue for dasd_delete_device waits.
 584  */
 585 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
 586
 587 /*
 588  * Remove a dasd device structure. The passed referenced
 589  * is destroyed.
 590  */
 591 void
 592 dasd_delete_device(struct dasd_device *device)
 593 {
 594         struct ccw_device *cdev;
 595         struct dasd_devmap *devmap;
 596         unsigned long flags;
 597
 598         /* First remove device pointer from devmap. */
 599         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 600         BUG_ON(IS_ERR(devmap));
 601         spin_lock(&dasd_devmap_lock);
 602         if (devmap->device != device) {
 603                 spin_unlock(&dasd_devmap_lock);
 604                 dasd_put_device(device);
 605                 return;
 606         }
 607         devmap->device = NULL;
 608         spin_unlock(&dasd_devmap_lock);
 609
 610         /* Disconnect dasd_device structure from ccw_device structure. */
 611         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 612         dev_set_drvdata(&device->cdev->dev, NULL);
 613         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 614
 615         /*
 616          * Drop ref_count by 3, one for the devmap reference, one for
 617          * the cdev reference and one for the passed reference.
 618          */
 619         atomic_sub(3, &device->ref_count);
 620
 621         /* Wait for reference counter to drop to zero. */
 622         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 623
 624         /* Disconnect dasd_device structure from ccw_device structure. */
 625         cdev = device->cdev;
 626         device->cdev = NULL;
 627
 628         /* Put ccw_device structure. */
 629         put_device(&cdev->dev);
 630
 631         /* Now the device structure can be freed. */
 632         dasd_free_device(device);
 633 }
 634
 635 /*
 636  * Reference counter dropped to zero. Wake up waiter
 637  * in dasd_delete_device.
 638  */
 639 void
 640 dasd_put_device_wake(struct dasd_device *device)
 641 {
 642         wake_up(&dasd_delete_wq);
 643 }
 644 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
 645
 646 /*
 647  * Return dasd_device structure associated with cdev.
 648  * This function needs to be called with the ccw device
 649  * lock held. It can be used from interrupt context.
 650  */
 651 struct dasd_device *
 652 dasd_device_from_cdev_locked(struct ccw_device *cdev)
 653 {
 654         struct dasd_device *device = dev_get_drvdata(&cdev->dev);
 655
 656         if (!device)
 657                 return ERR_PTR(-ENODEV);
 658         dasd_get_device(device);
 659         return device;
 660 }
 661
 662 /*
 663  * Return dasd_device structure associated with cdev.
 664  */
 665 struct dasd_device *
 666 dasd_device_from_cdev(struct ccw_device *cdev)
 667 {
 668         struct dasd_device *device;
 669         unsigned long flags;
 670
 671         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 672         device = dasd_device_from_cdev_locked(cdev);
 673         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 674         return device;
 675 }
 676
 677 /*
 678  * SECTION: files in sysfs
 679  */
 680
 681 /*
 682  * failfast controls the behaviour, if no path is available
 683  */
 684 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
 685                             char *buf)
 686 {
 687         struct dasd_devmap *devmap;
 688         int ff_flag;
 689
 690         devmap = dasd_find_busid(dev_name(dev));
 691         if (!IS_ERR(devmap))
 692                 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
 693         else
 694                 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
 695         return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
 696 }
 697
 698 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
 699               const char *buf, size_t count)
 700 {
 701         struct dasd_devmap *devmap;
 702         int val;
 703         char *endp;
 704
 705         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 706         if (IS_ERR(devmap))
 707                 return PTR_ERR(devmap);
 708
 709         val = simple_strtoul(buf, &endp, 0);
 710         if (((endp + 1) < (buf + count)) || (val > 1))
 711                 return -EINVAL;
 712
 713         spin_lock(&dasd_devmap_lock);
 714         if (val)
 715                 devmap->features |= DASD_FEATURE_FAILFAST;
 716         else
 717                 devmap->features &= ~DASD_FEATURE_FAILFAST;
 718         if (devmap->device)
 719                 devmap->device->features = devmap->features;
 720         spin_unlock(&dasd_devmap_lock);
 721         return count;
 722 }
 723
 724 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
 725
 726 /*
 727  * readonly controls the readonly status of a dasd
 728  */
 729 static ssize_t
 730 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 731 {
 732         struct dasd_devmap *devmap;
 733         int ro_flag;
 734
 735         devmap = dasd_find_busid(dev_name(dev));
 736         if (!IS_ERR(devmap))
 737                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
 738         else
 739                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
 740         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 741 }
 742
 743 static ssize_t
 744 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 745               const char *buf, size_t count)
 746 {
 747         struct dasd_devmap *devmap;
 748         struct dasd_device *device;
 749         int val;
 750         char *endp;
 751
 752         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 753         if (IS_ERR(devmap))
 754                 return PTR_ERR(devmap);
 755
 756         val = simple_strtoul(buf, &endp, 0);
 757         if (((endp + 1) < (buf + count)) || (val > 1))
 758                 return -EINVAL;
 759
 760         spin_lock(&dasd_devmap_lock);
 761         if (val)
 762                 devmap->features |= DASD_FEATURE_READONLY;
 763         else
 764                 devmap->features &= ~DASD_FEATURE_READONLY;
 765         device = devmap->device;
 766         if (device) {
 767                 device->features = devmap->features;
 768                 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 769         }
 770         spin_unlock(&dasd_devmap_lock);
 771         if (device && device->block && device->block->gdp)
 772                 set_disk_ro(device->block->gdp, val);
 773         return count;
 774 }
 775
 776 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 777 /*
 778  * erplog controls the logging of ERP related data
 779  * (e.g. failing channel programs).
 780  */
 781 static ssize_t
 782 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 783 {
 784         struct dasd_devmap *devmap;
 785         int erplog;
 786
 787         devmap = dasd_find_busid(dev_name(dev));
 788         if (!IS_ERR(devmap))
 789                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 790         else
 791                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 792         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 793 }
 794
 795 static ssize_t
 796 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 797               const char *buf, size_t count)
 798 {
 799         struct dasd_devmap *devmap;
 800         int val;
 801         char *endp;
 802
 803         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 804         if (IS_ERR(devmap))
 805                 return PTR_ERR(devmap);
 806
 807         val = simple_strtoul(buf, &endp, 0);
 808         if (((endp + 1) < (buf + count)) || (val > 1))
 809                 return -EINVAL;
 810
 811         spin_lock(&dasd_devmap_lock);
 812         if (val)
 813                 devmap->features |= DASD_FEATURE_ERPLOG;
 814         else
 815                 devmap->features &= ~DASD_FEATURE_ERPLOG;
 816         if (devmap->device)
 817                 devmap->device->features = devmap->features;
 818         spin_unlock(&dasd_devmap_lock);
 819         return count;
 820 }
 821
 822 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 823
 824 /*
 825  * use_diag controls whether the driver should use diag rather than ssch
 826  * to talk to the device
 827  */
 828 static ssize_t
 829 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 830 {
 831         struct dasd_devmap *devmap;
 832         int use_diag;
 833
 834         devmap = dasd_find_busid(dev_name(dev));
 835         if (!IS_ERR(devmap))
 836                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 837         else
 838                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 839         return sprintf(buf, use_diag ? "1\n" : "0\n");
 840 }
 841
 842 static ssize_t
 843 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 844                     const char *buf, size_t count)
 845 {
 846         struct dasd_devmap *devmap;
 847         ssize_t rc;
 848         int val;
 849         char *endp;
 850
 851         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 852         if (IS_ERR(devmap))
 853                 return PTR_ERR(devmap);
 854
 855         val = simple_strtoul(buf, &endp, 0);
 856         if (((endp + 1) < (buf + count)) || (val > 1))
 857                 return -EINVAL;
 858
 859         spin_lock(&dasd_devmap_lock);
 860         /* Changing diag discipline flag is only allowed in offline state. */
 861         rc = count;
 862         if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
 863                 if (val)
 864                         devmap->features |= DASD_FEATURE_USEDIAG;
 865                 else
 866                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 867         } else
 868                 rc = -EPERM;
 869         spin_unlock(&dasd_devmap_lock);
 870         return rc;
 871 }
 872
 873 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 874
 875 /*
 876  * use_raw controls whether the driver should give access to raw eckd data or
 877  * operate in standard mode
 878  */
 879 static ssize_t
 880 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
 881 {
 882         struct dasd_devmap *devmap;
 883         int use_raw;
 884
 885         devmap = dasd_find_busid(dev_name(dev));
 886         if (!IS_ERR(devmap))
 887                 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
 888         else
 889                 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
 890         return sprintf(buf, use_raw ? "1\n" : "0\n");
 891 }
 892
 893 static ssize_t
 894 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
 895                     const char *buf, size_t count)
 896 {
 897         struct dasd_devmap *devmap;
 898         ssize_t rc;
 899         unsigned long val;
 900
 901         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 902         if (IS_ERR(devmap))
 903                 return PTR_ERR(devmap);
 904
 905         if ((strict_strtoul(buf, 10, &val) != 0) || val > 1)
 906                 return -EINVAL;
 907
 908         spin_lock(&dasd_devmap_lock);
 909         /* Changing diag discipline flag is only allowed in offline state. */
 910         rc = count;
 911         if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
 912                 if (val)
 913                         devmap->features |= DASD_FEATURE_USERAW;
 914                 else
 915                         devmap->features &= ~DASD_FEATURE_USERAW;
 916         } else
 917                 rc = -EPERM;
 918         spin_unlock(&dasd_devmap_lock);
 919         return rc;
 920 }
 921
 922 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
 923                    dasd_use_raw_store);
 924
 925 static ssize_t
 926 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
 927                      char *buf)
 928 {
 929         struct dasd_device *device;
 930         ssize_t len;
 931
 932         device = dasd_device_from_cdev(to_ccwdev(dev));
 933         if (IS_ERR(device))
 934                 goto out;
 935         else if (!device->discipline) {
 936                 dasd_put_device(device);
 937                 goto out;
 938         } else {
 939                 len = snprintf(buf, PAGE_SIZE, "%s\n",
 940                                device->discipline->name);
 941                 dasd_put_device(device);
 942                 return len;
 943         }
 944 out:
 945         len = snprintf(buf, PAGE_SIZE, "none\n");
 946         return len;
 947 }
 948
 949 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
 950
 951 static ssize_t
 952 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
 953                      char *buf)
 954 {
 955         struct dasd_device *device;
 956         ssize_t len;
 957
 958         device = dasd_device_from_cdev(to_ccwdev(dev));
 959         if (!IS_ERR(device)) {
 960                 switch (device->state) {
 961                 case DASD_STATE_NEW:
 962                         len = snprintf(buf, PAGE_SIZE, "new\n");
 963                         break;
 964                 case DASD_STATE_KNOWN:
 965                         len = snprintf(buf, PAGE_SIZE, "detected\n");
 966                         break;
 967                 case DASD_STATE_BASIC:
 968                         len = snprintf(buf, PAGE_SIZE, "basic\n");
 969                         break;
 970                 case DASD_STATE_UNFMT:
 971                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
 972                         break;
 973                 case DASD_STATE_READY:
 974                         len = snprintf(buf, PAGE_SIZE, "ready\n");
 975                         break;
 976                 case DASD_STATE_ONLINE:
 977                         len = snprintf(buf, PAGE_SIZE, "online\n");
 978                         break;
 979                 default:
 980                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
 981                         break;
 982                 }
 983                 dasd_put_device(device);
 984         } else
 985                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
 986         return len;
 987 }
 988
 989 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
 990
 991 static ssize_t dasd_alias_show(struct device *dev,
 992                                struct device_attribute *attr, char *buf)
 993 {
 994         struct dasd_device *device;
 995         struct dasd_uid uid;
 996
 997         device = dasd_device_from_cdev(to_ccwdev(dev));
 998         if (IS_ERR(device))
 999                 return sprintf(buf, "0\n");
1000
1001         if (device->discipline && device->discipline->get_uid &&
1002             !device->discipline->get_uid(device, &uid)) {
1003                 if (uid.type == UA_BASE_PAV_ALIAS ||
1004                     uid.type == UA_HYPER_PAV_ALIAS) {
1005                         dasd_put_device(device);
1006                         return sprintf(buf, "1\n");
1007                 }
1008         }
1009         dasd_put_device(device);
1010
1011         return sprintf(buf, "0\n");
1012 }
1013
1014 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1015
1016 static ssize_t dasd_vendor_show(struct device *dev,
1017                                 struct device_attribute *attr, char *buf)
1018 {
1019         struct dasd_device *device;
1020         struct dasd_uid uid;
1021         char *vendor;
1022
1023         device = dasd_device_from_cdev(to_ccwdev(dev));
1024         vendor = "";
1025         if (IS_ERR(device))
1026                 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1027
1028         if (device->discipline && device->discipline->get_uid &&
1029             !device->discipline->get_uid(device, &uid))
1030                         vendor = uid.vendor;
1031
1032         dasd_put_device(device);
1033
1034         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1035 }
1036
1037 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1038
1039 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1040                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1041                      /* vduit */ 32 + 1)
1042
1043 static ssize_t
1044 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1045 {
1046         struct dasd_device *device;
1047         struct dasd_uid uid;
1048         char uid_string[UID_STRLEN];
1049         char ua_string[3];
1050
1051         device = dasd_device_from_cdev(to_ccwdev(dev));
1052         uid_string[0] = 0;
1053         if (IS_ERR(device))
1054                 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1055
1056         if (device->discipline && device->discipline->get_uid &&
1057             !device->discipline->get_uid(device, &uid)) {
1058                 switch (uid.type) {
1059                 case UA_BASE_DEVICE:
1060                         snprintf(ua_string, sizeof(ua_string), "%02x",
1061                                  uid.real_unit_addr);
1062                         break;
1063                 case UA_BASE_PAV_ALIAS:
1064                         snprintf(ua_string, sizeof(ua_string), "%02x",
1065                                  uid.base_unit_addr);
1066                         break;
1067                 case UA_HYPER_PAV_ALIAS:
1068                         snprintf(ua_string, sizeof(ua_string), "xx");
1069                         break;
1070                 default:
1071                         /* should not happen, treat like base device */
1072                         snprintf(ua_string, sizeof(ua_string), "%02x",
1073                                  uid.real_unit_addr);
1074                         break;
1075                 }
1076
1077                 if (strlen(uid.vduit) > 0)
1078                         snprintf(uid_string, sizeof(uid_string),
1079                                  "%s.%s.%04x.%s.%s",
1080                                  uid.vendor, uid.serial, uid.ssid, ua_string,
1081                                  uid.vduit);
1082                 else
1083                         snprintf(uid_string, sizeof(uid_string),
1084                                  "%s.%s.%04x.%s",
1085                                  uid.vendor, uid.serial, uid.ssid, ua_string);
1086         }
1087         dasd_put_device(device);
1088
1089         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1090 }
1091 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1092
1093 /*
1094  * extended error-reporting
1095  */
1096 static ssize_t
1097 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1098 {
1099         struct dasd_devmap *devmap;
1100         int eer_flag;
1101
1102         devmap = dasd_find_busid(dev_name(dev));
1103         if (!IS_ERR(devmap) && devmap->device)
1104                 eer_flag = dasd_eer_enabled(devmap->device);
1105         else
1106                 eer_flag = 0;
1107         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1108 }
1109
1110 static ssize_t
1111 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1112                const char *buf, size_t count)
1113 {
1114         struct dasd_devmap *devmap;
1115         int val, rc;
1116         char *endp;
1117
1118         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1119         if (IS_ERR(devmap))
1120                 return PTR_ERR(devmap);
1121         if (!devmap->device)
1122                 return -ENODEV;
1123
1124         val = simple_strtoul(buf, &endp, 0);
1125         if (((endp + 1) < (buf + count)) || (val > 1))
1126                 return -EINVAL;
1127
1128         if (val) {
1129                 rc = dasd_eer_enable(devmap->device);
1130                 if (rc)
1131                         return rc;
1132         } else
1133                 dasd_eer_disable(devmap->device);
1134         return count;
1135 }
1136
1137 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1138
1139 /*
1140  * expiration time for default requests
1141  */
1142 static ssize_t
1143 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1144 {
1145         struct dasd_device *device;
1146         int len;
1147
1148         device = dasd_device_from_cdev(to_ccwdev(dev));
1149         if (IS_ERR(device))
1150                 return -ENODEV;
1151         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1152         dasd_put_device(device);
1153         return len;
1154 }
1155
1156 static ssize_t
1157 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1158                const char *buf, size_t count)
1159 {
1160         struct dasd_device *device;
1161         unsigned long val;
1162
1163         device = dasd_device_from_cdev(to_ccwdev(dev));
1164         if (IS_ERR(device))
1165                 return -ENODEV;
1166
1167         if ((strict_strtoul(buf, 10, &val) != 0) ||
1168             (val > DASD_EXPIRES_MAX) || val == 0) {
1169                 dasd_put_device(device);
1170                 return -EINVAL;
1171         }
1172
1173         if (val)
1174                 device->default_expires = val;
1175
1176         dasd_put_device(device);
1177         return count;
1178 }
1179
1180 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1181
1182 static ssize_t dasd_reservation_policy_show(struct device *dev,
1183                                             struct device_attribute *attr,
1184                                             char *buf)
1185 {
1186         struct dasd_devmap *devmap;
1187         int rc = 0;
1188
1189         devmap = dasd_find_busid(dev_name(dev));
1190         if (IS_ERR(devmap)) {
1191                 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1192         } else {
1193                 spin_lock(&dasd_devmap_lock);
1194                 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1195                         rc = snprintf(buf, PAGE_SIZE, "fail\n");
1196                 else
1197                         rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1198                 spin_unlock(&dasd_devmap_lock);
1199         }
1200         return rc;
1201 }
1202
1203 static ssize_t dasd_reservation_policy_store(struct device *dev,
1204                                              struct device_attribute *attr,
1205                                              const char *buf, size_t count)
1206 {
1207         struct dasd_devmap *devmap;
1208         int rc;
1209
1210         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1211         if (IS_ERR(devmap))
1212                 return PTR_ERR(devmap);
1213         rc = 0;
1214         spin_lock(&dasd_devmap_lock);
1215         if (sysfs_streq("ignore", buf))
1216                 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1217         else if (sysfs_streq("fail", buf))
1218                 devmap->features |= DASD_FEATURE_FAILONSLCK;
1219         else
1220                 rc = -EINVAL;
1221         if (devmap->device)
1222                 devmap->device->features = devmap->features;
1223         spin_unlock(&dasd_devmap_lock);
1224         if (rc)
1225                 return rc;
1226         else
1227                 return count;
1228 }
1229
1230 static DEVICE_ATTR(reservation_policy, 0644,
1231                    dasd_reservation_policy_show, dasd_reservation_policy_store);
1232
1233 static ssize_t dasd_reservation_state_show(struct device *dev,
1234                                            struct device_attribute *attr,
1235                                            char *buf)
1236 {
1237         struct dasd_device *device;
1238         int rc = 0;
1239
1240         device = dasd_device_from_cdev(to_ccwdev(dev));
1241         if (IS_ERR(device))
1242                 return snprintf(buf, PAGE_SIZE, "none\n");
1243
1244         if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1245                 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1246         else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1247                 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1248         else
1249                 rc = snprintf(buf, PAGE_SIZE, "none\n");
1250         dasd_put_device(device);
1251         return rc;
1252 }
1253
1254 static ssize_t dasd_reservation_state_store(struct device *dev,
1255                                             struct device_attribute *attr,
1256                                             const char *buf, size_t count)
1257 {
1258         struct dasd_device *device;
1259         int rc = 0;
1260
1261         device = dasd_device_from_cdev(to_ccwdev(dev));
1262         if (IS_ERR(device))
1263                 return -ENODEV;
1264         if (sysfs_streq("reset", buf))
1265                 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1266         else
1267                 rc = -EINVAL;
1268         dasd_put_device(device);
1269
1270         if (rc)
1271                 return rc;
1272         else
1273                 return count;
1274 }
1275
1276 static DEVICE_ATTR(last_known_reservation_state, 0644,
1277                    dasd_reservation_state_show, dasd_reservation_state_store);
1278
1279 static struct attribute * dasd_attrs[] = {
1280         &dev_attr_readonly.attr,
1281         &dev_attr_discipline.attr,
1282         &dev_attr_status.attr,
1283         &dev_attr_alias.attr,
1284         &dev_attr_vendor.attr,
1285         &dev_attr_uid.attr,
1286         &dev_attr_use_diag.attr,
1287         &dev_attr_raw_track_access.attr,
1288         &dev_attr_eer_enabled.attr,
1289         &dev_attr_erplog.attr,
1290         &dev_attr_failfast.attr,
1291         &dev_attr_expires.attr,
1292         &dev_attr_reservation_policy.attr,
1293         &dev_attr_last_known_reservation_state.attr,
1294         NULL,
1295 };
1296
1297 static struct attribute_group dasd_attr_group = {
1298         .attrs = dasd_attrs,
1299 };
1300
1301 /*
1302  * Return value of the specified feature.
1303  */
1304 int
1305 dasd_get_feature(struct ccw_device *cdev, int feature)
1306 {
1307         struct dasd_devmap *devmap;
1308
1309         devmap = dasd_find_busid(dev_name(&cdev->dev));
1310         if (IS_ERR(devmap))
1311                 return PTR_ERR(devmap);
1312
1313         return ((devmap->features & feature) != 0);
1314 }
1315
1316 /*
1317  * Set / reset given feature.
1318  * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1319  */
1320 int
1321 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1322 {
1323         struct dasd_devmap *devmap;
1324
1325         devmap = dasd_find_busid(dev_name(&cdev->dev));
1326         if (IS_ERR(devmap))
1327                 return PTR_ERR(devmap);
1328
1329         spin_lock(&dasd_devmap_lock);
1330         if (flag)
1331                 devmap->features |= feature;
1332         else
1333                 devmap->features &= ~feature;
1334         if (devmap->device)
1335                 devmap->device->features = devmap->features;
1336         spin_unlock(&dasd_devmap_lock);
1337         return 0;
1338 }
1339
1340
1341 int
1342 dasd_add_sysfs_files(struct ccw_device *cdev)
1343 {
1344         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1345 }
1346
1347 void
1348 dasd_remove_sysfs_files(struct ccw_device *cdev)
1349 {
1350         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1351 }
1352
1353
1354 int
1355 dasd_devmap_init(void)
1356 {
1357         int i;
1358
1359         /* Initialize devmap structures. */
1360         dasd_max_devindex = 0;
1361         for (i = 0; i < 256; i++)
1362                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1363         return 0;
1364 }
1365
1366 void
1367 dasd_devmap_exit(void)
1368 {
1369         dasd_forget_ranges();
1370 }