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 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
 678 {
 679         struct dasd_devmap *devmap;
 680
 681         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 682         if (IS_ERR(devmap))
 683                 return;
 684         spin_lock(&dasd_devmap_lock);
 685         gdp->private_data = devmap;
 686         spin_unlock(&dasd_devmap_lock);
 687 }
 688
 689 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
 690 {
 691         struct dasd_device *device;
 692         struct dasd_devmap *devmap;
 693
 694         if (!gdp->private_data)
 695                 return NULL;
 696         device = NULL;
 697         spin_lock(&dasd_devmap_lock);
 698         devmap = gdp->private_data;
 699         if (devmap && devmap->device) {
 700                 device = devmap->device;
 701                 dasd_get_device(device);
 702         }
 703         spin_unlock(&dasd_devmap_lock);
 704         return device;
 705 }
 706
 707 /*
 708  * SECTION: files in sysfs
 709  */
 710
 711 /*
 712  * failfast controls the behaviour, if no path is available
 713  */
 714 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
 715                             char *buf)
 716 {
 717         struct dasd_devmap *devmap;
 718         int ff_flag;
 719
 720         devmap = dasd_find_busid(dev_name(dev));
 721         if (!IS_ERR(devmap))
 722                 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
 723         else
 724                 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
 725         return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
 726 }
 727
 728 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
 729               const char *buf, size_t count)
 730 {
 731         struct dasd_devmap *devmap;
 732         int val;
 733         char *endp;
 734
 735         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 736         if (IS_ERR(devmap))
 737                 return PTR_ERR(devmap);
 738
 739         val = simple_strtoul(buf, &endp, 0);
 740         if (((endp + 1) < (buf + count)) || (val > 1))
 741                 return -EINVAL;
 742
 743         spin_lock(&dasd_devmap_lock);
 744         if (val)
 745                 devmap->features |= DASD_FEATURE_FAILFAST;
 746         else
 747                 devmap->features &= ~DASD_FEATURE_FAILFAST;
 748         if (devmap->device)
 749                 devmap->device->features = devmap->features;
 750         spin_unlock(&dasd_devmap_lock);
 751         return count;
 752 }
 753
 754 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
 755
 756 /*
 757  * readonly controls the readonly status of a dasd
 758  */
 759 static ssize_t
 760 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 761 {
 762         struct dasd_devmap *devmap;
 763         int ro_flag;
 764
 765         devmap = dasd_find_busid(dev_name(dev));
 766         if (!IS_ERR(devmap))
 767                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
 768         else
 769                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
 770         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 771 }
 772
 773 static ssize_t
 774 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 775               const char *buf, size_t count)
 776 {
 777         struct dasd_devmap *devmap;
 778         struct dasd_device *device;
 779         int val;
 780         char *endp;
 781
 782         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 783         if (IS_ERR(devmap))
 784                 return PTR_ERR(devmap);
 785
 786         val = simple_strtoul(buf, &endp, 0);
 787         if (((endp + 1) < (buf + count)) || (val > 1))
 788                 return -EINVAL;
 789
 790         spin_lock(&dasd_devmap_lock);
 791         if (val)
 792                 devmap->features |= DASD_FEATURE_READONLY;
 793         else
 794                 devmap->features &= ~DASD_FEATURE_READONLY;
 795         device = devmap->device;
 796         if (device) {
 797                 device->features = devmap->features;
 798                 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 799         }
 800         spin_unlock(&dasd_devmap_lock);
 801         if (device && device->block && device->block->gdp)
 802                 set_disk_ro(device->block->gdp, val);
 803         return count;
 804 }
 805
 806 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 807 /*
 808  * erplog controls the logging of ERP related data
 809  * (e.g. failing channel programs).
 810  */
 811 static ssize_t
 812 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 813 {
 814         struct dasd_devmap *devmap;
 815         int erplog;
 816
 817         devmap = dasd_find_busid(dev_name(dev));
 818         if (!IS_ERR(devmap))
 819                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 820         else
 821                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 822         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 823 }
 824
 825 static ssize_t
 826 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 827               const char *buf, size_t count)
 828 {
 829         struct dasd_devmap *devmap;
 830         int val;
 831         char *endp;
 832
 833         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 834         if (IS_ERR(devmap))
 835                 return PTR_ERR(devmap);
 836
 837         val = simple_strtoul(buf, &endp, 0);
 838         if (((endp + 1) < (buf + count)) || (val > 1))
 839                 return -EINVAL;
 840
 841         spin_lock(&dasd_devmap_lock);
 842         if (val)
 843                 devmap->features |= DASD_FEATURE_ERPLOG;
 844         else
 845                 devmap->features &= ~DASD_FEATURE_ERPLOG;
 846         if (devmap->device)
 847                 devmap->device->features = devmap->features;
 848         spin_unlock(&dasd_devmap_lock);
 849         return count;
 850 }
 851
 852 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 853
 854 /*
 855  * use_diag controls whether the driver should use diag rather than ssch
 856  * to talk to the device
 857  */
 858 static ssize_t
 859 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 860 {
 861         struct dasd_devmap *devmap;
 862         int use_diag;
 863
 864         devmap = dasd_find_busid(dev_name(dev));
 865         if (!IS_ERR(devmap))
 866                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 867         else
 868                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 869         return sprintf(buf, use_diag ? "1\n" : "0\n");
 870 }
 871
 872 static ssize_t
 873 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 874                     const char *buf, size_t count)
 875 {
 876         struct dasd_devmap *devmap;
 877         ssize_t rc;
 878         int val;
 879         char *endp;
 880
 881         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 882         if (IS_ERR(devmap))
 883                 return PTR_ERR(devmap);
 884
 885         val = simple_strtoul(buf, &endp, 0);
 886         if (((endp + 1) < (buf + count)) || (val > 1))
 887                 return -EINVAL;
 888
 889         spin_lock(&dasd_devmap_lock);
 890         /* Changing diag discipline flag is only allowed in offline state. */
 891         rc = count;
 892         if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
 893                 if (val)
 894                         devmap->features |= DASD_FEATURE_USEDIAG;
 895                 else
 896                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 897         } else
 898                 rc = -EPERM;
 899         spin_unlock(&dasd_devmap_lock);
 900         return rc;
 901 }
 902
 903 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 904
 905 /*
 906  * use_raw controls whether the driver should give access to raw eckd data or
 907  * operate in standard mode
 908  */
 909 static ssize_t
 910 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
 911 {
 912         struct dasd_devmap *devmap;
 913         int use_raw;
 914
 915         devmap = dasd_find_busid(dev_name(dev));
 916         if (!IS_ERR(devmap))
 917                 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
 918         else
 919                 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
 920         return sprintf(buf, use_raw ? "1\n" : "0\n");
 921 }
 922
 923 static ssize_t
 924 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
 925                     const char *buf, size_t count)
 926 {
 927         struct dasd_devmap *devmap;
 928         ssize_t rc;
 929         unsigned long val;
 930
 931         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 932         if (IS_ERR(devmap))
 933                 return PTR_ERR(devmap);
 934
 935         if ((strict_strtoul(buf, 10, &val) != 0) || val > 1)
 936                 return -EINVAL;
 937
 938         spin_lock(&dasd_devmap_lock);
 939         /* Changing diag discipline flag is only allowed in offline state. */
 940         rc = count;
 941         if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
 942                 if (val)
 943                         devmap->features |= DASD_FEATURE_USERAW;
 944                 else
 945                         devmap->features &= ~DASD_FEATURE_USERAW;
 946         } else
 947                 rc = -EPERM;
 948         spin_unlock(&dasd_devmap_lock);
 949         return rc;
 950 }
 951
 952 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
 953                    dasd_use_raw_store);
 954
 955 static ssize_t
 956 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
 957                      char *buf)
 958 {
 959         struct dasd_device *device;
 960         ssize_t len;
 961
 962         device = dasd_device_from_cdev(to_ccwdev(dev));
 963         if (IS_ERR(device))
 964                 goto out;
 965         else if (!device->discipline) {
 966                 dasd_put_device(device);
 967                 goto out;
 968         } else {
 969                 len = snprintf(buf, PAGE_SIZE, "%s\n",
 970                                device->discipline->name);
 971                 dasd_put_device(device);
 972                 return len;
 973         }
 974 out:
 975         len = snprintf(buf, PAGE_SIZE, "none\n");
 976         return len;
 977 }
 978
 979 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
 980
 981 static ssize_t
 982 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
 983                      char *buf)
 984 {
 985         struct dasd_device *device;
 986         ssize_t len;
 987
 988         device = dasd_device_from_cdev(to_ccwdev(dev));
 989         if (!IS_ERR(device)) {
 990                 switch (device->state) {
 991                 case DASD_STATE_NEW:
 992                         len = snprintf(buf, PAGE_SIZE, "new\n");
 993                         break;
 994                 case DASD_STATE_KNOWN:
 995                         len = snprintf(buf, PAGE_SIZE, "detected\n");
 996                         break;
 997                 case DASD_STATE_BASIC:
 998                         len = snprintf(buf, PAGE_SIZE, "basic\n");
 999                         break;
1000                 case DASD_STATE_UNFMT:
1001                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1002                         break;
1003                 case DASD_STATE_READY:
1004                         len = snprintf(buf, PAGE_SIZE, "ready\n");
1005                         break;
1006                 case DASD_STATE_ONLINE:
1007                         len = snprintf(buf, PAGE_SIZE, "online\n");
1008                         break;
1009                 default:
1010                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
1011                         break;
1012                 }
1013                 dasd_put_device(device);
1014         } else
1015                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1016         return len;
1017 }
1018
1019 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1020
1021 static ssize_t dasd_alias_show(struct device *dev,
1022                                struct device_attribute *attr, char *buf)
1023 {
1024         struct dasd_device *device;
1025         struct dasd_uid uid;
1026
1027         device = dasd_device_from_cdev(to_ccwdev(dev));
1028         if (IS_ERR(device))
1029                 return sprintf(buf, "0\n");
1030
1031         if (device->discipline && device->discipline->get_uid &&
1032             !device->discipline->get_uid(device, &uid)) {
1033                 if (uid.type == UA_BASE_PAV_ALIAS ||
1034                     uid.type == UA_HYPER_PAV_ALIAS) {
1035                         dasd_put_device(device);
1036                         return sprintf(buf, "1\n");
1037                 }
1038         }
1039         dasd_put_device(device);
1040
1041         return sprintf(buf, "0\n");
1042 }
1043
1044 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1045
1046 static ssize_t dasd_vendor_show(struct device *dev,
1047                                 struct device_attribute *attr, char *buf)
1048 {
1049         struct dasd_device *device;
1050         struct dasd_uid uid;
1051         char *vendor;
1052
1053         device = dasd_device_from_cdev(to_ccwdev(dev));
1054         vendor = "";
1055         if (IS_ERR(device))
1056                 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1057
1058         if (device->discipline && device->discipline->get_uid &&
1059             !device->discipline->get_uid(device, &uid))
1060                         vendor = uid.vendor;
1061
1062         dasd_put_device(device);
1063
1064         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1065 }
1066
1067 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1068
1069 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1070                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1071                      /* vduit */ 32 + 1)
1072
1073 static ssize_t
1074 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1075 {
1076         struct dasd_device *device;
1077         struct dasd_uid uid;
1078         char uid_string[UID_STRLEN];
1079         char ua_string[3];
1080
1081         device = dasd_device_from_cdev(to_ccwdev(dev));
1082         uid_string[0] = 0;
1083         if (IS_ERR(device))
1084                 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1085
1086         if (device->discipline && device->discipline->get_uid &&
1087             !device->discipline->get_uid(device, &uid)) {
1088                 switch (uid.type) {
1089                 case UA_BASE_DEVICE:
1090                         snprintf(ua_string, sizeof(ua_string), "%02x",
1091                                  uid.real_unit_addr);
1092                         break;
1093                 case UA_BASE_PAV_ALIAS:
1094                         snprintf(ua_string, sizeof(ua_string), "%02x",
1095                                  uid.base_unit_addr);
1096                         break;
1097                 case UA_HYPER_PAV_ALIAS:
1098                         snprintf(ua_string, sizeof(ua_string), "xx");
1099                         break;
1100                 default:
1101                         /* should not happen, treat like base device */
1102                         snprintf(ua_string, sizeof(ua_string), "%02x",
1103                                  uid.real_unit_addr);
1104                         break;
1105                 }
1106
1107                 if (strlen(uid.vduit) > 0)
1108                         snprintf(uid_string, sizeof(uid_string),
1109                                  "%s.%s.%04x.%s.%s",
1110                                  uid.vendor, uid.serial, uid.ssid, ua_string,
1111                                  uid.vduit);
1112                 else
1113                         snprintf(uid_string, sizeof(uid_string),
1114                                  "%s.%s.%04x.%s",
1115                                  uid.vendor, uid.serial, uid.ssid, ua_string);
1116         }
1117         dasd_put_device(device);
1118
1119         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1120 }
1121 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1122
1123 /*
1124  * extended error-reporting
1125  */
1126 static ssize_t
1127 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1128 {
1129         struct dasd_devmap *devmap;
1130         int eer_flag;
1131
1132         devmap = dasd_find_busid(dev_name(dev));
1133         if (!IS_ERR(devmap) && devmap->device)
1134                 eer_flag = dasd_eer_enabled(devmap->device);
1135         else
1136                 eer_flag = 0;
1137         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1138 }
1139
1140 static ssize_t
1141 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1142                const char *buf, size_t count)
1143 {
1144         struct dasd_devmap *devmap;
1145         int val, rc;
1146         char *endp;
1147
1148         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1149         if (IS_ERR(devmap))
1150                 return PTR_ERR(devmap);
1151         if (!devmap->device)
1152                 return -ENODEV;
1153
1154         val = simple_strtoul(buf, &endp, 0);
1155         if (((endp + 1) < (buf + count)) || (val > 1))
1156                 return -EINVAL;
1157
1158         if (val) {
1159                 rc = dasd_eer_enable(devmap->device);
1160                 if (rc)
1161                         return rc;
1162         } else
1163                 dasd_eer_disable(devmap->device);
1164         return count;
1165 }
1166
1167 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1168
1169 /*
1170  * expiration time for default requests
1171  */
1172 static ssize_t
1173 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1174 {
1175         struct dasd_device *device;
1176         int len;
1177
1178         device = dasd_device_from_cdev(to_ccwdev(dev));
1179         if (IS_ERR(device))
1180                 return -ENODEV;
1181         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1182         dasd_put_device(device);
1183         return len;
1184 }
1185
1186 static ssize_t
1187 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1188                const char *buf, size_t count)
1189 {
1190         struct dasd_device *device;
1191         unsigned long val;
1192
1193         device = dasd_device_from_cdev(to_ccwdev(dev));
1194         if (IS_ERR(device))
1195                 return -ENODEV;
1196
1197         if ((strict_strtoul(buf, 10, &val) != 0) ||
1198             (val > DASD_EXPIRES_MAX) || val == 0) {
1199                 dasd_put_device(device);
1200                 return -EINVAL;
1201         }
1202
1203         if (val)
1204                 device->default_expires = val;
1205
1206         dasd_put_device(device);
1207         return count;
1208 }
1209
1210 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1211
1212 static ssize_t dasd_reservation_policy_show(struct device *dev,
1213                                             struct device_attribute *attr,
1214                                             char *buf)
1215 {
1216         struct dasd_devmap *devmap;
1217         int rc = 0;
1218
1219         devmap = dasd_find_busid(dev_name(dev));
1220         if (IS_ERR(devmap)) {
1221                 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1222         } else {
1223                 spin_lock(&dasd_devmap_lock);
1224                 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1225                         rc = snprintf(buf, PAGE_SIZE, "fail\n");
1226                 else
1227                         rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1228                 spin_unlock(&dasd_devmap_lock);
1229         }
1230         return rc;
1231 }
1232
1233 static ssize_t dasd_reservation_policy_store(struct device *dev,
1234                                              struct device_attribute *attr,
1235                                              const char *buf, size_t count)
1236 {
1237         struct dasd_devmap *devmap;
1238         int rc;
1239
1240         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1241         if (IS_ERR(devmap))
1242                 return PTR_ERR(devmap);
1243         rc = 0;
1244         spin_lock(&dasd_devmap_lock);
1245         if (sysfs_streq("ignore", buf))
1246                 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1247         else if (sysfs_streq("fail", buf))
1248                 devmap->features |= DASD_FEATURE_FAILONSLCK;
1249         else
1250                 rc = -EINVAL;
1251         if (devmap->device)
1252                 devmap->device->features = devmap->features;
1253         spin_unlock(&dasd_devmap_lock);
1254         if (rc)
1255                 return rc;
1256         else
1257                 return count;
1258 }
1259
1260 static DEVICE_ATTR(reservation_policy, 0644,
1261                    dasd_reservation_policy_show, dasd_reservation_policy_store);
1262
1263 static ssize_t dasd_reservation_state_show(struct device *dev,
1264                                            struct device_attribute *attr,
1265                                            char *buf)
1266 {
1267         struct dasd_device *device;
1268         int rc = 0;
1269
1270         device = dasd_device_from_cdev(to_ccwdev(dev));
1271         if (IS_ERR(device))
1272                 return snprintf(buf, PAGE_SIZE, "none\n");
1273
1274         if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1275                 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1276         else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1277                 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1278         else
1279                 rc = snprintf(buf, PAGE_SIZE, "none\n");
1280         dasd_put_device(device);
1281         return rc;
1282 }
1283
1284 static ssize_t dasd_reservation_state_store(struct device *dev,
1285                                             struct device_attribute *attr,
1286                                             const char *buf, size_t count)
1287 {
1288         struct dasd_device *device;
1289         int rc = 0;
1290
1291         device = dasd_device_from_cdev(to_ccwdev(dev));
1292         if (IS_ERR(device))
1293                 return -ENODEV;
1294         if (sysfs_streq("reset", buf))
1295                 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1296         else
1297                 rc = -EINVAL;
1298         dasd_put_device(device);
1299
1300         if (rc)
1301                 return rc;
1302         else
1303                 return count;
1304 }
1305
1306 static DEVICE_ATTR(last_known_reservation_state, 0644,
1307                    dasd_reservation_state_show, dasd_reservation_state_store);
1308
1309 static struct attribute * dasd_attrs[] = {
1310         &dev_attr_readonly.attr,
1311         &dev_attr_discipline.attr,
1312         &dev_attr_status.attr,
1313         &dev_attr_alias.attr,
1314         &dev_attr_vendor.attr,
1315         &dev_attr_uid.attr,
1316         &dev_attr_use_diag.attr,
1317         &dev_attr_raw_track_access.attr,
1318         &dev_attr_eer_enabled.attr,
1319         &dev_attr_erplog.attr,
1320         &dev_attr_failfast.attr,
1321         &dev_attr_expires.attr,
1322         &dev_attr_reservation_policy.attr,
1323         &dev_attr_last_known_reservation_state.attr,
1324         NULL,
1325 };
1326
1327 static struct attribute_group dasd_attr_group = {
1328         .attrs = dasd_attrs,
1329 };
1330
1331 /*
1332  * Return value of the specified feature.
1333  */
1334 int
1335 dasd_get_feature(struct ccw_device *cdev, int feature)
1336 {
1337         struct dasd_devmap *devmap;
1338
1339         devmap = dasd_find_busid(dev_name(&cdev->dev));
1340         if (IS_ERR(devmap))
1341                 return PTR_ERR(devmap);
1342
1343         return ((devmap->features & feature) != 0);
1344 }
1345
1346 /*
1347  * Set / reset given feature.
1348  * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1349  */
1350 int
1351 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1352 {
1353         struct dasd_devmap *devmap;
1354
1355         devmap = dasd_find_busid(dev_name(&cdev->dev));
1356         if (IS_ERR(devmap))
1357                 return PTR_ERR(devmap);
1358
1359         spin_lock(&dasd_devmap_lock);
1360         if (flag)
1361                 devmap->features |= feature;
1362         else
1363                 devmap->features &= ~feature;
1364         if (devmap->device)
1365                 devmap->device->features = devmap->features;
1366         spin_unlock(&dasd_devmap_lock);
1367         return 0;
1368 }
1369
1370
1371 int
1372 dasd_add_sysfs_files(struct ccw_device *cdev)
1373 {
1374         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1375 }
1376
1377 void
1378 dasd_remove_sysfs_files(struct ccw_device *cdev)
1379 {
1380         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1381 }
1382
1383
1384 int
1385 dasd_devmap_init(void)
1386 {
1387         int i;
1388
1389         /* Initialize devmap structures. */
1390         dasd_max_devindex = 0;
1391         for (i = 0; i < 256; i++)
1392                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1393         return 0;
1394 }
1395
1396 void
1397 dasd_devmap_exit(void)
1398 {
1399         dasd_forget_ranges();
1400 }