kernel/drivers/s390/block/dasd_devmap.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999,2001
   8  *
   9  * Device mapping and dasd= parameter parsing functions. All devmap
  10  * functions may not be called from interrupt context. In particular
  11  * dasd_get_device is a no-no from interrupt context.
  12  *
  13  */
  14
  15 #define KMSG_COMPONENT "dasd"
  16
  17 #include <linux/ctype.h>
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21
  22 #include <asm/debug.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/ipl.h>
  25
  26 /* This is ugly... */
  27 #define PRINTK_HEADER "dasd_devmap:"
  28 #define DASD_BUS_ID_SIZE 20
  29
  30 #include "dasd_int.h"
  31
  32 struct kmem_cache *dasd_page_cache;
  33 EXPORT_SYMBOL_GPL(dasd_page_cache);
  34
  35 /*
  36  * dasd_devmap_t is used to store the features and the relation
  37  * between device number and device index. To find a dasd_devmap_t
  38  * that corresponds to a device number of a device index each
  39  * dasd_devmap_t is added to two linked lists, one to search by
  40  * the device number and one to search by the device index. As
  41  * soon as big minor numbers are available the device index list
  42  * can be removed since the device number will then be identical
  43  * to the device index.
  44  */
  45 struct dasd_devmap {
  46         struct list_head list;
  47         char bus_id[DASD_BUS_ID_SIZE];
  48         unsigned int devindex;
  49         unsigned short features;
  50         struct dasd_device *device;
  51 };
  52
  53 /*
  54  * Parameter parsing functions for dasd= parameter. The syntax is:
  55  *   <devno>            : (0x)?[0-9a-fA-F]+
  56  *   <busid>            : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
  57  *   <feature>          : ro
  58  *   <feature_list>     : \(<feature>(:<feature>)*\)
  59  *   <devno-range>      : <devno>(-<devno>)?<feature_list>?
  60  *   <busid-range>      : <busid>(-<busid>)?<feature_list>?
  61  *   <devices>          : <devno-range>|<busid-range>
  62  *   <dasd_module>      : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
  63  *
  64  *   <dasd>             : autodetect|probeonly|<devices>(,<devices>)*
  65  */
  66
  67 int dasd_probeonly =  0;        /* is true, when probeonly mode is active */
  68 int dasd_autodetect = 0;        /* is true, when autodetection is active */
  69 int dasd_nopav = 0;             /* is true, when PAV is disabled */
  70 EXPORT_SYMBOL_GPL(dasd_nopav);
  71 int dasd_nofcx;                 /* disable High Performance Ficon */
  72 EXPORT_SYMBOL_GPL(dasd_nofcx);
  73
  74 /*
  75  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
  76  * it is named 'dasd' to directly be filled by insmod with the comma separated
  77  * strings when running as a module.
  78  */
  79 static char *dasd[256];
  80 module_param_array(dasd, charp, NULL, S_IRUGO);
  81
  82 /*
  83  * Single spinlock to protect devmap and servermap structures and lists.
  84  */
  85 static DEFINE_SPINLOCK(dasd_devmap_lock);
  86
  87 /*
  88  * Hash lists for devmap structures.
  89  */
  90 static struct list_head dasd_hashlists[256];
  91 int dasd_max_devindex;
  92
  93 static struct dasd_devmap *dasd_add_busid(const char *, int);
  94
  95 static inline int
  96 dasd_hash_busid(const char *bus_id)
  97 {
  98         int hash, i;
  99
 100         hash = 0;
 101         for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
 102                 hash += *bus_id;
 103         return hash & 0xff;
 104 }
 105
 106 #ifndef MODULE
 107 /*
 108  * The parameter parsing functions for builtin-drivers are called
 109  * before kmalloc works. Store the pointers to the parameters strings
 110  * into dasd[] for later processing.
 111  */
 112 static int __init
 113 dasd_call_setup(char *str)
 114 {
 115         static int count = 0;
 116
 117         if (count < 256)
 118                 dasd[count++] = str;
 119         return 1;
 120 }
 121
 122 __setup ("dasd=", dasd_call_setup);
 123 #endif  /* #ifndef MODULE */
 124
 125 #define DASD_IPLDEV     "ipldev"
 126
 127 /*
 128  * Read a device busid/devno from a string.
 129  */
 130 static int
 131
 132 dasd_busid(char **str, int *id0, int *id1, int *devno)
 133 {
 134         int val, old_style;
 135
 136         /* Interpret ipldev busid */
 137         if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
 138                 if (ipl_info.type != IPL_TYPE_CCW) {
 139                         pr_err("The IPL device is not a CCW device\n");
 140                         return -EINVAL;
 141                 }
 142                 *id0 = 0;
 143                 *id1 = ipl_info.data.ccw.dev_id.ssid;
 144                 *devno = ipl_info.data.ccw.dev_id.devno;
 145                 *str += strlen(DASD_IPLDEV);
 146
 147                 return 0;
 148         }
 149         /* check for leading '0x' */
 150         old_style = 0;
 151         if ((*str)[0] == '0' && (*str)[1] == 'x') {
 152                 *str += 2;
 153                 old_style = 1;
 154         }
 155         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 156                 return -EINVAL;
 157         val = simple_strtoul(*str, str, 16);
 158         if (old_style || (*str)[0] != '.') {
 159                 *id0 = *id1 = 0;
 160                 if (val < 0 || val > 0xffff)
 161                         return -EINVAL;
 162                 *devno = val;
 163                 return 0;
 164         }
 165         /* New style x.y.z busid */
 166         if (val < 0 || val > 0xff)
 167                 return -EINVAL;
 168         *id0 = val;
 169         (*str)++;
 170         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 171                 return -EINVAL;
 172         val = simple_strtoul(*str, str, 16);
 173         if (val < 0 || val > 0xff || (*str)++[0] != '.')
 174                 return -EINVAL;
 175         *id1 = val;
 176         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 177                 return -EINVAL;
 178         val = simple_strtoul(*str, str, 16);
 179         if (val < 0 || val > 0xffff)
 180                 return -EINVAL;
 181         *devno = val;
 182         return 0;
 183 }
 184
 185 /*
 186  * Read colon separated list of dasd features. Currently there is
 187  * only one: "ro" for read-only devices. The default feature set
 188  * is empty (value 0).
 189  */
 190 static int
 191 dasd_feature_list(char *str, char **endp)
 192 {
 193         int features, len, rc;
 194
 195         rc = 0;
 196         if (*str != '(') {
 197                 *endp = str;
 198                 return DASD_FEATURE_DEFAULT;
 199         }
 200         str++;
 201         features = 0;
 202
 203         while (1) {
 204                 for (len = 0;
 205                      str[len] && str[len] != ':' && str[len] != ')'; len++);
 206                 if (len == 2 && !strncmp(str, "ro", 2))
 207                         features |= DASD_FEATURE_READONLY;
 208                 else if (len == 4 && !strncmp(str, "diag", 4))
 209                         features |= DASD_FEATURE_USEDIAG;
 210                 else if (len == 3 && !strncmp(str, "raw", 3))
 211                         features |= DASD_FEATURE_USERAW;
 212                 else if (len == 6 && !strncmp(str, "erplog", 6))
 213                         features |= DASD_FEATURE_ERPLOG;
 214                 else if (len == 8 && !strncmp(str, "failfast", 8))
 215                         features |= DASD_FEATURE_FAILFAST;
 216                 else {
 217                         pr_warning("%*s is not a supported device option\n",
 218                                    len, str);
 219                         rc = -EINVAL;
 220                 }
 221                 str += len;
 222                 if (*str != ':')
 223                         break;
 224                 str++;
 225         }
 226         if (*str != ')') {
 227                 pr_warning("A closing parenthesis ')' is missing in the "
 228                            "dasd= parameter\n");
 229                 rc = -EINVAL;
 230         } else
 231                 str++;
 232         *endp = str;
 233         if (rc != 0)
 234                 return rc;
 235         return features;
 236 }
 237
 238 /*
 239  * Try to match the first element on the comma separated parse string
 240  * with one of the known keywords. If a keyword is found, take the approprate
 241  * action and return a pointer to the residual string. If the first element
 242  * could not be matched to any keyword then return an error code.
 243  */
 244 static char *
 245 dasd_parse_keyword( char *parsestring ) {
 246
 247         char *nextcomma, *residual_str;
 248         int length;
 249
 250         nextcomma = strchr(parsestring,',');
 251         if (nextcomma) {
 252                 length = nextcomma - parsestring;
 253                 residual_str = nextcomma + 1;
 254         } else {
 255                 length = strlen(parsestring);
 256                 residual_str = parsestring + length;
 257         }
 258         if (strncmp("autodetect", parsestring, length) == 0) {
 259                 dasd_autodetect = 1;
 260                 pr_info("The autodetection mode has been activated\n");
 261                 return residual_str;
 262         }
 263         if (strncmp("probeonly", parsestring, length) == 0) {
 264                 dasd_probeonly = 1;
 265                 pr_info("The probeonly mode has been activated\n");
 266                 return residual_str;
 267         }
 268         if (strncmp("nopav", parsestring, length) == 0) {
 269                 if (MACHINE_IS_VM)
 270                         pr_info("'nopav' is not supported on z/VM\n");
 271                 else {
 272                         dasd_nopav = 1;
 273                         pr_info("PAV support has be deactivated\n");
 274                 }
 275                 return residual_str;
 276         }
 277         if (strncmp("nofcx", parsestring, length) == 0) {
 278                 dasd_nofcx = 1;
 279                 pr_info("High Performance FICON support has been "
 280                         "deactivated\n");
 281                 return residual_str;
 282         }
 283         if (strncmp("fixedbuffers", parsestring, length) == 0) {
 284                 if (dasd_page_cache)
 285                         return residual_str;
 286                 dasd_page_cache =
 287                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
 288                                           PAGE_SIZE, SLAB_CACHE_DMA,
 289                                           NULL);
 290                 if (!dasd_page_cache)
 291                         DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
 292                                 "fixed buffer mode disabled.");
 293                 else
 294                         DBF_EVENT(DBF_INFO, "%s",
 295                                  "turning on fixed buffer mode");
 296                 return residual_str;
 297         }
 298         return ERR_PTR(-EINVAL);
 299 }
 300
 301 /*
 302  * Try to interprete the first element on the comma separated parse string
 303  * as a device number or a range of devices. If the interpretation is
 304  * successful, create the matching dasd_devmap entries and return a pointer
 305  * to the residual string.
 306  * If interpretation fails or in case of an error, return an error code.
 307  */
 308 static char *
 309 dasd_parse_range( char *parsestring ) {
 310
 311         struct dasd_devmap *devmap;
 312         int from, from_id0, from_id1;
 313         int to, to_id0, to_id1;
 314         int features, rc;
 315         char bus_id[DASD_BUS_ID_SIZE+1], *str;
 316
 317         str = parsestring;
 318         rc = dasd_busid(&str, &from_id0, &from_id1, &from);
 319         if (rc == 0) {
 320                 to = from;
 321                 to_id0 = from_id0;
 322                 to_id1 = from_id1;
 323                 if (*str == '-') {
 324                         str++;
 325                         rc = dasd_busid(&str, &to_id0, &to_id1, &to);
 326                 }
 327         }
 328         if (rc == 0 &&
 329             (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
 330                 rc = -EINVAL;
 331         if (rc) {
 332                 pr_err("%s is not a valid device range\n", parsestring);
 333                 return ERR_PTR(rc);
 334         }
 335         features = dasd_feature_list(str, &str);
 336         if (features < 0)
 337                 return ERR_PTR(-EINVAL);
 338         /* each device in dasd= parameter should be set initially online */
 339         features |= DASD_FEATURE_INITIAL_ONLINE;
 340         while (from <= to) {
 341                 sprintf(bus_id, "%01x.%01x.%04x",
 342                         from_id0, from_id1, from++);
 343                 devmap = dasd_add_busid(bus_id, features);
 344                 if (IS_ERR(devmap))
 345                         return (char *)devmap;
 346         }
 347         if (*str == ',')
 348                 return str + 1;
 349         if (*str == '\0')
 350                 return str;
 351         pr_warning("The dasd= parameter value %s has an invalid ending\n",
 352                    str);
 353         return ERR_PTR(-EINVAL);
 354 }
 355
 356 static char *
 357 dasd_parse_next_element( char *parsestring ) {
 358         char * residual_str;
 359         residual_str = dasd_parse_keyword(parsestring);
 360         if (!IS_ERR(residual_str))
 361                 return residual_str;
 362         residual_str = dasd_parse_range(parsestring);
 363         return residual_str;
 364 }
 365
 366 /*
 367  * Parse parameters stored in dasd[]
 368  * The 'dasd=...' parameter allows to specify a comma separated list of
 369  * keywords and device ranges. When the dasd driver is build into the kernel,
 370  * the complete list will be stored as one element of the dasd[] array.
 371  * When the dasd driver is build as a module, then the list is broken into
 372  * it's elements and each dasd[] entry contains one element.
 373  */
 374 int
 375 dasd_parse(void)
 376 {
 377         int rc, i;
 378         char *parsestring;
 379
 380         rc = 0;
 381         for (i = 0; i < 256; i++) {
 382                 if (dasd[i] == NULL)
 383                         break;
 384                 parsestring = dasd[i];
 385                 /* loop over the comma separated list in the parsestring */
 386                 while (*parsestring) {
 387                         parsestring = dasd_parse_next_element(parsestring);
 388                         if(IS_ERR(parsestring)) {
 389                                 rc = PTR_ERR(parsestring);
 390                                 break;
 391                         }
 392                 }
 393                 if (rc) {
 394                         DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
 395                         break;
 396                 }
 397         }
 398         return rc;
 399 }
 400
 401 /*
 402  * Add a devmap for the device specified by busid. It is possible that
 403  * the devmap already exists (dasd= parameter). The order of the devices
 404  * added through this function will define the kdevs for the individual
 405  * devices.
 406  */
 407 static struct dasd_devmap *
 408 dasd_add_busid(const char *bus_id, int features)
 409 {
 410         struct dasd_devmap *devmap, *new, *tmp;
 411         int hash;
 412
 413         new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
 414         if (!new)
 415                 return ERR_PTR(-ENOMEM);
 416         spin_lock(&dasd_devmap_lock);
 417         devmap = NULL;
 418         hash = dasd_hash_busid(bus_id);
 419         list_for_each_entry(tmp, &dasd_hashlists[hash], list)
 420                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 421                         devmap = tmp;
 422                         break;
 423                 }
 424         if (!devmap) {
 425                 /* This bus_id is new. */
 426                 new->devindex = dasd_max_devindex++;
 427                 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
 428                 new->features = features;
 429                 new->device = NULL;
 430                 list_add(&new->list, &dasd_hashlists[hash]);
 431                 devmap = new;
 432                 new = NULL;
 433         }
 434         spin_unlock(&dasd_devmap_lock);
 435         kfree(new);
 436         return devmap;
 437 }
 438
 439 /*
 440  * Find devmap for device with given bus_id.
 441  */
 442 static struct dasd_devmap *
 443 dasd_find_busid(const char *bus_id)
 444 {
 445         struct dasd_devmap *devmap, *tmp;
 446         int hash;
 447
 448         spin_lock(&dasd_devmap_lock);
 449         devmap = ERR_PTR(-ENODEV);
 450         hash = dasd_hash_busid(bus_id);
 451         list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
 452                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 453                         devmap = tmp;
 454                         break;
 455                 }
 456         }
 457         spin_unlock(&dasd_devmap_lock);
 458         return devmap;
 459 }
 460
 461 /*
 462  * Check if busid has been added to the list of dasd ranges.
 463  */
 464 int
 465 dasd_busid_known(const char *bus_id)
 466 {
 467         return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
 468 }
 469
 470 /*
 471  * Forget all about the device numbers added so far.
 472  * This may only be called at module unload or system shutdown.
 473  */
 474 static void
 475 dasd_forget_ranges(void)
 476 {
 477         struct dasd_devmap *devmap, *n;
 478         int i;
 479
 480         spin_lock(&dasd_devmap_lock);
 481         for (i = 0; i < 256; i++) {
 482                 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
 483                         BUG_ON(devmap->device != NULL);
 484                         list_del(&devmap->list);
 485                         kfree(devmap);
 486                 }
 487         }
 488         spin_unlock(&dasd_devmap_lock);
 489 }
 490
 491 /*
 492  * Find the device struct by its device index.
 493  */
 494 struct dasd_device *
 495 dasd_device_from_devindex(int devindex)
 496 {
 497         struct dasd_devmap *devmap, *tmp;
 498         struct dasd_device *device;
 499         int i;
 500
 501         spin_lock(&dasd_devmap_lock);
 502         devmap = NULL;
 503         for (i = 0; (i < 256) && !devmap; i++)
 504                 list_for_each_entry(tmp, &dasd_hashlists[i], list)
 505                         if (tmp->devindex == devindex) {
 506                                 /* Found the devmap for the device. */
 507                                 devmap = tmp;
 508                                 break;
 509                         }
 510         if (devmap && devmap->device) {
 511                 device = devmap->device;
 512                 dasd_get_device(device);
 513         } else
 514                 device = ERR_PTR(-ENODEV);
 515         spin_unlock(&dasd_devmap_lock);
 516         return device;
 517 }
 518
 519 /*
 520  * Return devmap for cdev. If no devmap exists yet, create one and
 521  * connect it to the cdev.
 522  */
 523 static struct dasd_devmap *
 524 dasd_devmap_from_cdev(struct ccw_device *cdev)
 525 {
 526         struct dasd_devmap *devmap;
 527
 528         devmap = dasd_find_busid(dev_name(&cdev->dev));
 529         if (IS_ERR(devmap))
 530                 devmap = dasd_add_busid(dev_name(&cdev->dev),
 531                                         DASD_FEATURE_DEFAULT);
 532         return devmap;
 533 }
 534
 535 /*
 536  * Create a dasd device structure for cdev.
 537  */
 538 struct dasd_device *
 539 dasd_create_device(struct ccw_device *cdev)
 540 {
 541         struct dasd_devmap *devmap;
 542         struct dasd_device *device;
 543         unsigned long flags;
 544         int rc;
 545
 546         devmap = dasd_devmap_from_cdev(cdev);
 547         if (IS_ERR(devmap))
 548                 return (void *) devmap;
 549
 550         device = dasd_alloc_device();
 551         if (IS_ERR(device))
 552                 return device;
 553         atomic_set(&device->ref_count, 3);
 554
 555         spin_lock(&dasd_devmap_lock);
 556         if (!devmap->device) {
 557                 devmap->device = device;
 558                 device->devindex = devmap->devindex;
 559                 device->features = devmap->features;
 560                 get_device(&cdev->dev);
 561                 device->cdev = cdev;
 562                 rc = 0;
 563         } else
 564                 /* Someone else was faster. */
 565                 rc = -EBUSY;
 566         spin_unlock(&dasd_devmap_lock);
 567
 568         if (rc) {
 569                 dasd_free_device(device);
 570                 return ERR_PTR(rc);
 571         }
 572
 573         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 574         dev_set_drvdata(&cdev->dev, device);
 575         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 576
 577         return device;
 578 }
 579
 580 /*
 581  * Wait queue for dasd_delete_device waits.
 582  */
 583 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
 584
 585 /*
 586  * Remove a dasd device structure. The passed referenced
 587  * is destroyed.
 588  */
 589 void
 590 dasd_delete_device(struct dasd_device *device)
 591 {
 592         struct ccw_device *cdev;
 593         struct dasd_devmap *devmap;
 594         unsigned long flags;
 595
 596         /* First remove device pointer from devmap. */
 597         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 598         BUG_ON(IS_ERR(devmap));
 599         spin_lock(&dasd_devmap_lock);
 600         if (devmap->device != device) {
 601                 spin_unlock(&dasd_devmap_lock);
 602                 dasd_put_device(device);
 603                 return;
 604         }
 605         devmap->device = NULL;
 606         spin_unlock(&dasd_devmap_lock);
 607
 608         /* Disconnect dasd_device structure from ccw_device structure. */
 609         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 610         dev_set_drvdata(&device->cdev->dev, NULL);
 611         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 612
 613         /*
 614          * Drop ref_count by 3, one for the devmap reference, one for
 615          * the cdev reference and one for the passed reference.
 616          */
 617         atomic_sub(3, &device->ref_count);
 618
 619         /* Wait for reference counter to drop to zero. */
 620         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 621
 622         /* Disconnect dasd_device structure from ccw_device structure. */
 623         cdev = device->cdev;
 624         device->cdev = NULL;
 625
 626         /* Put ccw_device structure. */
 627         put_device(&cdev->dev);
 628
 629         /* Now the device structure can be freed. */
 630         dasd_free_device(device);
 631 }
 632
 633 /*
 634  * Reference counter dropped to zero. Wake up waiter
 635  * in dasd_delete_device.
 636  */
 637 void
 638 dasd_put_device_wake(struct dasd_device *device)
 639 {
 640         wake_up(&dasd_delete_wq);
 641 }
 642 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
 643
 644 /*
 645  * Return dasd_device structure associated with cdev.
 646  * This function needs to be called with the ccw device
 647  * lock held. It can be used from interrupt context.
 648  */
 649 struct dasd_device *
 650 dasd_device_from_cdev_locked(struct ccw_device *cdev)
 651 {
 652         struct dasd_device *device = dev_get_drvdata(&cdev->dev);
 653
 654         if (!device)
 655                 return ERR_PTR(-ENODEV);
 656         dasd_get_device(device);
 657         return device;
 658 }
 659
 660 /*
 661  * Return dasd_device structure associated with cdev.
 662  */
 663 struct dasd_device *
 664 dasd_device_from_cdev(struct ccw_device *cdev)
 665 {
 666         struct dasd_device *device;
 667         unsigned long flags;
 668
 669         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 670         device = dasd_device_from_cdev_locked(cdev);
 671         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 672         return device;
 673 }
 674
 675 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
 676 {
 677         struct dasd_devmap *devmap;
 678
 679         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 680         if (IS_ERR(devmap))
 681                 return;
 682         spin_lock(&dasd_devmap_lock);
 683         gdp->private_data = devmap;
 684         spin_unlock(&dasd_devmap_lock);
 685 }
 686
 687 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
 688 {
 689         struct dasd_device *device;
 690         struct dasd_devmap *devmap;
 691
 692         if (!gdp->private_data)
 693                 return NULL;
 694         device = NULL;
 695         spin_lock(&dasd_devmap_lock);
 696         devmap = gdp->private_data;
 697         if (devmap && devmap->device) {
 698                 device = devmap->device;
 699                 dasd_get_device(device);
 700         }
 701         spin_unlock(&dasd_devmap_lock);
 702         return device;
 703 }
 704
 705 /*
 706  * SECTION: files in sysfs
 707  */
 708
 709 /*
 710  * failfast controls the behaviour, if no path is available
 711  */
 712 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
 713                             char *buf)
 714 {
 715         struct dasd_devmap *devmap;
 716         int ff_flag;
 717
 718         devmap = dasd_find_busid(dev_name(dev));
 719         if (!IS_ERR(devmap))
 720                 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
 721         else
 722                 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
 723         return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
 724 }
 725
 726 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
 727               const char *buf, size_t count)
 728 {
 729         struct dasd_devmap *devmap;
 730         int val;
 731         char *endp;
 732
 733         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 734         if (IS_ERR(devmap))
 735                 return PTR_ERR(devmap);
 736
 737         val = simple_strtoul(buf, &endp, 0);
 738         if (((endp + 1) < (buf + count)) || (val > 1))
 739                 return -EINVAL;
 740
 741         spin_lock(&dasd_devmap_lock);
 742         if (val)
 743                 devmap->features |= DASD_FEATURE_FAILFAST;
 744         else
 745                 devmap->features &= ~DASD_FEATURE_FAILFAST;
 746         if (devmap->device)
 747                 devmap->device->features = devmap->features;
 748         spin_unlock(&dasd_devmap_lock);
 749         return count;
 750 }
 751
 752 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
 753
 754 /*
 755  * readonly controls the readonly status of a dasd
 756  */
 757 static ssize_t
 758 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 759 {
 760         struct dasd_devmap *devmap;
 761         int ro_flag;
 762
 763         devmap = dasd_find_busid(dev_name(dev));
 764         if (!IS_ERR(devmap))
 765                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
 766         else
 767                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
 768         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 769 }
 770
 771 static ssize_t
 772 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 773               const char *buf, size_t count)
 774 {
 775         struct dasd_devmap *devmap;
 776         struct dasd_device *device;
 777         int val;
 778         char *endp;
 779
 780         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 781         if (IS_ERR(devmap))
 782                 return PTR_ERR(devmap);
 783
 784         val = simple_strtoul(buf, &endp, 0);
 785         if (((endp + 1) < (buf + count)) || (val > 1))
 786                 return -EINVAL;
 787
 788         spin_lock(&dasd_devmap_lock);
 789         if (val)
 790                 devmap->features |= DASD_FEATURE_READONLY;
 791         else
 792                 devmap->features &= ~DASD_FEATURE_READONLY;
 793         device = devmap->device;
 794         if (device) {
 795                 device->features = devmap->features;
 796                 val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 797         }
 798         spin_unlock(&dasd_devmap_lock);
 799         if (device && device->block && device->block->gdp)
 800                 set_disk_ro(device->block->gdp, val);
 801         return count;
 802 }
 803
 804 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 805 /*
 806  * erplog controls the logging of ERP related data
 807  * (e.g. failing channel programs).
 808  */
 809 static ssize_t
 810 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 811 {
 812         struct dasd_devmap *devmap;
 813         int erplog;
 814
 815         devmap = dasd_find_busid(dev_name(dev));
 816         if (!IS_ERR(devmap))
 817                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 818         else
 819                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 820         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 821 }
 822
 823 static ssize_t
 824 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 825               const char *buf, size_t count)
 826 {
 827         struct dasd_devmap *devmap;
 828         int val;
 829         char *endp;
 830
 831         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 832         if (IS_ERR(devmap))
 833                 return PTR_ERR(devmap);
 834
 835         val = simple_strtoul(buf, &endp, 0);
 836         if (((endp + 1) < (buf + count)) || (val > 1))
 837                 return -EINVAL;
 838
 839         spin_lock(&dasd_devmap_lock);
 840         if (val)
 841                 devmap->features |= DASD_FEATURE_ERPLOG;
 842         else
 843                 devmap->features &= ~DASD_FEATURE_ERPLOG;
 844         if (devmap->device)
 845                 devmap->device->features = devmap->features;
 846         spin_unlock(&dasd_devmap_lock);
 847         return count;
 848 }
 849
 850 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 851
 852 /*
 853  * use_diag controls whether the driver should use diag rather than ssch
 854  * to talk to the device
 855  */
 856 static ssize_t
 857 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 858 {
 859         struct dasd_devmap *devmap;
 860         int use_diag;
 861
 862         devmap = dasd_find_busid(dev_name(dev));
 863         if (!IS_ERR(devmap))
 864                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 865         else
 866                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 867         return sprintf(buf, use_diag ? "1\n" : "0\n");
 868 }
 869
 870 static ssize_t
 871 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 872                     const char *buf, size_t count)
 873 {
 874         struct dasd_devmap *devmap;
 875         ssize_t rc;
 876         int val;
 877         char *endp;
 878
 879         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 880         if (IS_ERR(devmap))
 881                 return PTR_ERR(devmap);
 882
 883         val = simple_strtoul(buf, &endp, 0);
 884         if (((endp + 1) < (buf + count)) || (val > 1))
 885                 return -EINVAL;
 886
 887         spin_lock(&dasd_devmap_lock);
 888         /* Changing diag discipline flag is only allowed in offline state. */
 889         rc = count;
 890         if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
 891                 if (val)
 892                         devmap->features |= DASD_FEATURE_USEDIAG;
 893                 else
 894                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 895         } else
 896                 rc = -EPERM;
 897         spin_unlock(&dasd_devmap_lock);
 898         return rc;
 899 }
 900
 901 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 902
 903 /*
 904  * use_raw controls whether the driver should give access to raw eckd data or
 905  * operate in standard mode
 906  */
 907 static ssize_t
 908 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
 909 {
 910         struct dasd_devmap *devmap;
 911         int use_raw;
 912
 913         devmap = dasd_find_busid(dev_name(dev));
 914         if (!IS_ERR(devmap))
 915                 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
 916         else
 917                 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
 918         return sprintf(buf, use_raw ? "1\n" : "0\n");
 919 }
 920
 921 static ssize_t
 922 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
 923                     const char *buf, size_t count)
 924 {
 925         struct dasd_devmap *devmap;
 926         ssize_t rc;
 927         unsigned long val;
 928
 929         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 930         if (IS_ERR(devmap))
 931                 return PTR_ERR(devmap);
 932
 933         if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
 934                 return -EINVAL;
 935
 936         spin_lock(&dasd_devmap_lock);
 937         /* Changing diag discipline flag is only allowed in offline state. */
 938         rc = count;
 939         if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
 940                 if (val)
 941                         devmap->features |= DASD_FEATURE_USERAW;
 942                 else
 943                         devmap->features &= ~DASD_FEATURE_USERAW;
 944         } else
 945                 rc = -EPERM;
 946         spin_unlock(&dasd_devmap_lock);
 947         return rc;
 948 }
 949
 950 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
 951                    dasd_use_raw_store);
 952
 953 static ssize_t
 954 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
 955                         const char *buf, size_t count)
 956 {
 957         struct ccw_device *cdev = to_ccwdev(dev);
 958         struct dasd_device *device;
 959         int rc;
 960
 961         device = dasd_device_from_cdev(cdev);
 962         if (IS_ERR(device)) {
 963                 rc = PTR_ERR(device);
 964                 goto out;
 965         }
 966
 967         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
 968             test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
 969                 /* Already doing offline processing */
 970                 dasd_put_device(device);
 971                 rc = -EBUSY;
 972                 goto out;
 973         }
 974
 975         set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
 976         dasd_put_device(device);
 977
 978         rc = ccw_device_set_offline(cdev);
 979
 980 out:
 981         return rc ? rc : count;
 982 }
 983
 984 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
 985
 986 static ssize_t
 987 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
 988                      char *buf)
 989 {
 990         struct dasd_device *device;
 991         ssize_t len;
 992
 993         device = dasd_device_from_cdev(to_ccwdev(dev));
 994         if (IS_ERR(device))
 995                 goto out;
 996         else if (!device->discipline) {
 997                 dasd_put_device(device);
 998                 goto out;
 999         } else {
1000                 len = snprintf(buf, PAGE_SIZE, "%s\n",
1001                                device->discipline->name);
1002                 dasd_put_device(device);
1003                 return len;
1004         }
1005 out:
1006         len = snprintf(buf, PAGE_SIZE, "none\n");
1007         return len;
1008 }
1009
1010 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1011
1012 static ssize_t
1013 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1014                      char *buf)
1015 {
1016         struct dasd_device *device;
1017         ssize_t len;
1018
1019         device = dasd_device_from_cdev(to_ccwdev(dev));
1020         if (!IS_ERR(device)) {
1021                 switch (device->state) {
1022                 case DASD_STATE_NEW:
1023                         len = snprintf(buf, PAGE_SIZE, "new\n");
1024                         break;
1025                 case DASD_STATE_KNOWN:
1026                         len = snprintf(buf, PAGE_SIZE, "detected\n");
1027                         break;
1028                 case DASD_STATE_BASIC:
1029                         len = snprintf(buf, PAGE_SIZE, "basic\n");
1030                         break;
1031                 case DASD_STATE_UNFMT:
1032                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1033                         break;
1034                 case DASD_STATE_READY:
1035                         len = snprintf(buf, PAGE_SIZE, "ready\n");
1036                         break;
1037                 case DASD_STATE_ONLINE:
1038                         len = snprintf(buf, PAGE_SIZE, "online\n");
1039                         break;
1040                 default:
1041                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
1042                         break;
1043                 }
1044                 dasd_put_device(device);
1045         } else
1046                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1047         return len;
1048 }
1049
1050 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1051
1052 static ssize_t dasd_alias_show(struct device *dev,
1053                                struct device_attribute *attr, char *buf)
1054 {
1055         struct dasd_device *device;
1056         struct dasd_uid uid;
1057
1058         device = dasd_device_from_cdev(to_ccwdev(dev));
1059         if (IS_ERR(device))
1060                 return sprintf(buf, "0\n");
1061
1062         if (device->discipline && device->discipline->get_uid &&
1063             !device->discipline->get_uid(device, &uid)) {
1064                 if (uid.type == UA_BASE_PAV_ALIAS ||
1065                     uid.type == UA_HYPER_PAV_ALIAS) {
1066                         dasd_put_device(device);
1067                         return sprintf(buf, "1\n");
1068                 }
1069         }
1070         dasd_put_device(device);
1071
1072         return sprintf(buf, "0\n");
1073 }
1074
1075 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1076
1077 static ssize_t dasd_vendor_show(struct device *dev,
1078                                 struct device_attribute *attr, char *buf)
1079 {
1080         struct dasd_device *device;
1081         struct dasd_uid uid;
1082         char *vendor;
1083
1084         device = dasd_device_from_cdev(to_ccwdev(dev));
1085         vendor = "";
1086         if (IS_ERR(device))
1087                 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1088
1089         if (device->discipline && device->discipline->get_uid &&
1090             !device->discipline->get_uid(device, &uid))
1091                         vendor = uid.vendor;
1092
1093         dasd_put_device(device);
1094
1095         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1096 }
1097
1098 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1099
1100 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1101                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1102                      /* vduit */ 32 + 1)
1103
1104 static ssize_t
1105 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1106 {
1107         struct dasd_device *device;
1108         struct dasd_uid uid;
1109         char uid_string[UID_STRLEN];
1110         char ua_string[3];
1111
1112         device = dasd_device_from_cdev(to_ccwdev(dev));
1113         uid_string[0] = 0;
1114         if (IS_ERR(device))
1115                 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1116
1117         if (device->discipline && device->discipline->get_uid &&
1118             !device->discipline->get_uid(device, &uid)) {
1119                 switch (uid.type) {
1120                 case UA_BASE_DEVICE:
1121                         snprintf(ua_string, sizeof(ua_string), "%02x",
1122                                  uid.real_unit_addr);
1123                         break;
1124                 case UA_BASE_PAV_ALIAS:
1125                         snprintf(ua_string, sizeof(ua_string), "%02x",
1126                                  uid.base_unit_addr);
1127                         break;
1128                 case UA_HYPER_PAV_ALIAS:
1129                         snprintf(ua_string, sizeof(ua_string), "xx");
1130                         break;
1131                 default:
1132                         /* should not happen, treat like base device */
1133                         snprintf(ua_string, sizeof(ua_string), "%02x",
1134                                  uid.real_unit_addr);
1135                         break;
1136                 }
1137
1138                 if (strlen(uid.vduit) > 0)
1139                         snprintf(uid_string, sizeof(uid_string),
1140                                  "%s.%s.%04x.%s.%s",
1141                                  uid.vendor, uid.serial, uid.ssid, ua_string,
1142                                  uid.vduit);
1143                 else
1144                         snprintf(uid_string, sizeof(uid_string),
1145                                  "%s.%s.%04x.%s",
1146                                  uid.vendor, uid.serial, uid.ssid, ua_string);
1147         }
1148         dasd_put_device(device);
1149
1150         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1151 }
1152 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1153
1154 /*
1155  * extended error-reporting
1156  */
1157 static ssize_t
1158 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1159 {
1160         struct dasd_devmap *devmap;
1161         int eer_flag;
1162
1163         devmap = dasd_find_busid(dev_name(dev));
1164         if (!IS_ERR(devmap) && devmap->device)
1165                 eer_flag = dasd_eer_enabled(devmap->device);
1166         else
1167                 eer_flag = 0;
1168         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1169 }
1170
1171 static ssize_t
1172 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1173                const char *buf, size_t count)
1174 {
1175         struct dasd_devmap *devmap;
1176         int val, rc;
1177         char *endp;
1178
1179         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1180         if (IS_ERR(devmap))
1181                 return PTR_ERR(devmap);
1182         if (!devmap->device)
1183                 return -ENODEV;
1184
1185         val = simple_strtoul(buf, &endp, 0);
1186         if (((endp + 1) < (buf + count)) || (val > 1))
1187                 return -EINVAL;
1188
1189         if (val) {
1190                 rc = dasd_eer_enable(devmap->device);
1191                 if (rc)
1192                         return rc;
1193         } else
1194                 dasd_eer_disable(devmap->device);
1195         return count;
1196 }
1197
1198 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1199
1200 /*
1201  * expiration time for default requests
1202  */
1203 static ssize_t
1204 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1205 {
1206         struct dasd_device *device;
1207         int len;
1208
1209         device = dasd_device_from_cdev(to_ccwdev(dev));
1210         if (IS_ERR(device))
1211                 return -ENODEV;
1212         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1213         dasd_put_device(device);
1214         return len;
1215 }
1216
1217 static ssize_t
1218 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1219                const char *buf, size_t count)
1220 {
1221         struct dasd_device *device;
1222         unsigned long val;
1223
1224         device = dasd_device_from_cdev(to_ccwdev(dev));
1225         if (IS_ERR(device))
1226                 return -ENODEV;
1227
1228         if ((kstrtoul(buf, 10, &val) != 0) ||
1229             (val > DASD_EXPIRES_MAX) || val == 0) {
1230                 dasd_put_device(device);
1231                 return -EINVAL;
1232         }
1233
1234         if (val)
1235                 device->default_expires = val;
1236
1237         dasd_put_device(device);
1238         return count;
1239 }
1240
1241 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1242
1243 static ssize_t
1244 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1245 {
1246         struct dasd_device *device;
1247         int len;
1248
1249         device = dasd_device_from_cdev(to_ccwdev(dev));
1250         if (IS_ERR(device))
1251                 return -ENODEV;
1252         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1253         dasd_put_device(device);
1254         return len;
1255 }
1256
1257 static ssize_t
1258 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1259                    const char *buf, size_t count)
1260 {
1261         struct dasd_device *device;
1262         unsigned long val;
1263
1264         device = dasd_device_from_cdev(to_ccwdev(dev));
1265         if (IS_ERR(device))
1266                 return -ENODEV;
1267
1268         if ((kstrtoul(buf, 10, &val) != 0) ||
1269             (val > DASD_RETRIES_MAX)) {
1270                 dasd_put_device(device);
1271                 return -EINVAL;
1272         }
1273
1274         if (val)
1275                 device->default_retries = val;
1276
1277         dasd_put_device(device);
1278         return count;
1279 }
1280
1281 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1282
1283 static ssize_t
1284 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1285                   char *buf)
1286 {
1287         struct dasd_device *device;
1288         int len;
1289
1290         device = dasd_device_from_cdev(to_ccwdev(dev));
1291         if (IS_ERR(device))
1292                 return -ENODEV;
1293         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1294         dasd_put_device(device);
1295         return len;
1296 }
1297
1298 static ssize_t
1299 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1300                    const char *buf, size_t count)
1301 {
1302         struct dasd_device *device;
1303         struct request_queue *q;
1304         unsigned long val, flags;
1305
1306         device = dasd_device_from_cdev(to_ccwdev(dev));
1307         if (IS_ERR(device) || !device->block)
1308                 return -ENODEV;
1309
1310         if ((kstrtoul(buf, 10, &val) != 0) ||
1311             val > UINT_MAX / HZ) {
1312                 dasd_put_device(device);
1313                 return -EINVAL;
1314         }
1315         q = device->block->request_queue;
1316         if (!q) {
1317                 dasd_put_device(device);
1318                 return -ENODEV;
1319         }
1320         spin_lock_irqsave(&device->block->request_queue_lock, flags);
1321         if (!val)
1322                 blk_queue_rq_timed_out(q, NULL);
1323         else
1324                 blk_queue_rq_timed_out(q, dasd_times_out);
1325
1326         device->blk_timeout = val;
1327
1328         blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1329         spin_unlock_irqrestore(&device->block->request_queue_lock, flags);
1330
1331         dasd_put_device(device);
1332         return count;
1333 }
1334
1335 static DEVICE_ATTR(timeout, 0644,
1336                    dasd_timeout_show, dasd_timeout_store);
1337
1338 static ssize_t dasd_reservation_policy_show(struct device *dev,
1339                                             struct device_attribute *attr,
1340                                             char *buf)
1341 {
1342         struct dasd_devmap *devmap;
1343         int rc = 0;
1344
1345         devmap = dasd_find_busid(dev_name(dev));
1346         if (IS_ERR(devmap)) {
1347                 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1348         } else {
1349                 spin_lock(&dasd_devmap_lock);
1350                 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1351                         rc = snprintf(buf, PAGE_SIZE, "fail\n");
1352                 else
1353                         rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1354                 spin_unlock(&dasd_devmap_lock);
1355         }
1356         return rc;
1357 }
1358
1359 static ssize_t dasd_reservation_policy_store(struct device *dev,
1360                                              struct device_attribute *attr,
1361                                              const char *buf, size_t count)
1362 {
1363         struct dasd_devmap *devmap;
1364         int rc;
1365
1366         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
1367         if (IS_ERR(devmap))
1368                 return PTR_ERR(devmap);
1369         rc = 0;
1370         spin_lock(&dasd_devmap_lock);
1371         if (sysfs_streq("ignore", buf))
1372                 devmap->features &= ~DASD_FEATURE_FAILONSLCK;
1373         else if (sysfs_streq("fail", buf))
1374                 devmap->features |= DASD_FEATURE_FAILONSLCK;
1375         else
1376                 rc = -EINVAL;
1377         if (devmap->device)
1378                 devmap->device->features = devmap->features;
1379         spin_unlock(&dasd_devmap_lock);
1380         if (rc)
1381                 return rc;
1382         else
1383                 return count;
1384 }
1385
1386 static DEVICE_ATTR(reservation_policy, 0644,
1387                    dasd_reservation_policy_show, dasd_reservation_policy_store);
1388
1389 static ssize_t dasd_reservation_state_show(struct device *dev,
1390                                            struct device_attribute *attr,
1391                                            char *buf)
1392 {
1393         struct dasd_device *device;
1394         int rc = 0;
1395
1396         device = dasd_device_from_cdev(to_ccwdev(dev));
1397         if (IS_ERR(device))
1398                 return snprintf(buf, PAGE_SIZE, "none\n");
1399
1400         if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1401                 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1402         else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1403                 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1404         else
1405                 rc = snprintf(buf, PAGE_SIZE, "none\n");
1406         dasd_put_device(device);
1407         return rc;
1408 }
1409
1410 static ssize_t dasd_reservation_state_store(struct device *dev,
1411                                             struct device_attribute *attr,
1412                                             const char *buf, size_t count)
1413 {
1414         struct dasd_device *device;
1415         int rc = 0;
1416
1417         device = dasd_device_from_cdev(to_ccwdev(dev));
1418         if (IS_ERR(device))
1419                 return -ENODEV;
1420         if (sysfs_streq("reset", buf))
1421                 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1422         else
1423                 rc = -EINVAL;
1424         dasd_put_device(device);
1425
1426         if (rc)
1427                 return rc;
1428         else
1429                 return count;
1430 }
1431
1432 static DEVICE_ATTR(last_known_reservation_state, 0644,
1433                    dasd_reservation_state_show, dasd_reservation_state_store);
1434
1435 static ssize_t dasd_pm_show(struct device *dev,
1436                               struct device_attribute *attr, char *buf)
1437 {
1438         struct dasd_device *device;
1439         u8 opm, nppm, cablepm, cuirpm, hpfpm;
1440
1441         device = dasd_device_from_cdev(to_ccwdev(dev));
1442         if (IS_ERR(device))
1443                 return sprintf(buf, "0\n");
1444
1445         opm = device->path_data.opm;
1446         nppm = device->path_data.npm;
1447         cablepm = device->path_data.cablepm;
1448         cuirpm = device->path_data.cuirpm;
1449         hpfpm = device->path_data.hpfpm;
1450         dasd_put_device(device);
1451
1452         return sprintf(buf, "%02x %02x %02x %02x %02x\n", opm, nppm,
1453                        cablepm, cuirpm, hpfpm);
1454 }
1455
1456 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1457
1458 static struct attribute * dasd_attrs[] = {
1459         &dev_attr_readonly.attr,
1460         &dev_attr_discipline.attr,
1461         &dev_attr_status.attr,
1462         &dev_attr_alias.attr,
1463         &dev_attr_vendor.attr,
1464         &dev_attr_uid.attr,
1465         &dev_attr_use_diag.attr,
1466         &dev_attr_raw_track_access.attr,
1467         &dev_attr_eer_enabled.attr,
1468         &dev_attr_erplog.attr,
1469         &dev_attr_failfast.attr,
1470         &dev_attr_expires.attr,
1471         &dev_attr_retries.attr,
1472         &dev_attr_timeout.attr,
1473         &dev_attr_reservation_policy.attr,
1474         &dev_attr_last_known_reservation_state.attr,
1475         &dev_attr_safe_offline.attr,
1476         &dev_attr_path_masks.attr,
1477         NULL,
1478 };
1479
1480 static struct attribute_group dasd_attr_group = {
1481         .attrs = dasd_attrs,
1482 };
1483
1484 /*
1485  * Return value of the specified feature.
1486  */
1487 int
1488 dasd_get_feature(struct ccw_device *cdev, int feature)
1489 {
1490         struct dasd_devmap *devmap;
1491
1492         devmap = dasd_find_busid(dev_name(&cdev->dev));
1493         if (IS_ERR(devmap))
1494                 return PTR_ERR(devmap);
1495
1496         return ((devmap->features & feature) != 0);
1497 }
1498
1499 /*
1500  * Set / reset given feature.
1501  * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1502  */
1503 int
1504 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1505 {
1506         struct dasd_devmap *devmap;
1507
1508         devmap = dasd_find_busid(dev_name(&cdev->dev));
1509         if (IS_ERR(devmap))
1510                 return PTR_ERR(devmap);
1511
1512         spin_lock(&dasd_devmap_lock);
1513         if (flag)
1514                 devmap->features |= feature;
1515         else
1516                 devmap->features &= ~feature;
1517         if (devmap->device)
1518                 devmap->device->features = devmap->features;
1519         spin_unlock(&dasd_devmap_lock);
1520         return 0;
1521 }
1522
1523
1524 int
1525 dasd_add_sysfs_files(struct ccw_device *cdev)
1526 {
1527         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1528 }
1529
1530 void
1531 dasd_remove_sysfs_files(struct ccw_device *cdev)
1532 {
1533         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1534 }
1535
1536
1537 int
1538 dasd_devmap_init(void)
1539 {
1540         int i;
1541
1542         /* Initialize devmap structures. */
1543         dasd_max_devindex = 0;
1544         for (i = 0; i < 256; i++)
1545                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1546         return 0;
1547 }
1548
1549 void
1550 dasd_devmap_exit(void)
1551 {
1552         dasd_forget_ranges();
1553 }