drivers/s390/block/dasd_devmap.c

   1 /*
   2  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   3  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   4  *                  Carsten Otte <Cotte@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * Copyright IBM Corp. 1999,2001
   8  *
   9  * Device mapping and dasd= parameter parsing functions. All devmap
  10  * functions may not be called from interrupt context. In particular
  11  * dasd_get_device is a no-no from interrupt context.
  12  *
  13  */
  14
  15 #define KMSG_COMPONENT "dasd"
  16
  17 #include <linux/ctype.h>
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/slab.h>
  21
  22 #include <asm/debug.h>
  23 #include <asm/uaccess.h>
  24 #include <asm/ipl.h>
  25
  26 /* This is ugly... */
  27 #define PRINTK_HEADER "dasd_devmap:"
  28 #define DASD_BUS_ID_SIZE 20
  29
  30 #include "dasd_int.h"
  31
  32 struct kmem_cache *dasd_page_cache;
  33 EXPORT_SYMBOL_GPL(dasd_page_cache);
  34
  35 /*
  36  * dasd_devmap_t is used to store the features and the relation
  37  * between device number and device index. To find a dasd_devmap_t
  38  * that corresponds to a device number of a device index each
  39  * dasd_devmap_t is added to two linked lists, one to search by
  40  * the device number and one to search by the device index. As
  41  * soon as big minor numbers are available the device index list
  42  * can be removed since the device number will then be identical
  43  * to the device index.
  44  */
  45 struct dasd_devmap {
  46         struct list_head list;
  47         char bus_id[DASD_BUS_ID_SIZE];
  48         unsigned int devindex;
  49         unsigned short features;
  50         struct dasd_device *device;
  51 };
  52
  53 /*
  54  * Parameter parsing functions for dasd= parameter. The syntax is:
  55  *   <devno>            : (0x)?[0-9a-fA-F]+
  56  *   <busid>            : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
  57  *   <feature>          : ro
  58  *   <feature_list>     : \(<feature>(:<feature>)*\)
  59  *   <devno-range>      : <devno>(-<devno>)?<feature_list>?
  60  *   <busid-range>      : <busid>(-<busid>)?<feature_list>?
  61  *   <devices>          : <devno-range>|<busid-range>
  62  *   <dasd_module>      : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
  63  *
  64  *   <dasd>             : autodetect|probeonly|<devices>(,<devices>)*
  65  */
  66
  67 int dasd_probeonly =  0;        /* is true, when probeonly mode is active */
  68 int dasd_autodetect = 0;        /* is true, when autodetection is active */
  69 int dasd_nopav = 0;             /* is true, when PAV is disabled */
  70 EXPORT_SYMBOL_GPL(dasd_nopav);
  71 int dasd_nofcx;                 /* disable High Performance Ficon */
  72 EXPORT_SYMBOL_GPL(dasd_nofcx);
  73
  74 /*
  75  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
  76  * it is named 'dasd' to directly be filled by insmod with the comma separated
  77  * strings when running as a module.
  78  */
  79 static char *dasd[256];
  80 module_param_array(dasd, charp, NULL, S_IRUGO);
  81
  82 /*
  83  * Single spinlock to protect devmap and servermap structures and lists.
  84  */
  85 static DEFINE_SPINLOCK(dasd_devmap_lock);
  86
  87 /*
  88  * Hash lists for devmap structures.
  89  */
  90 static struct list_head dasd_hashlists[256];
  91 int dasd_max_devindex;
  92
  93 static struct dasd_devmap *dasd_add_busid(const char *, int);
  94
  95 static inline int
  96 dasd_hash_busid(const char *bus_id)
  97 {
  98         int hash, i;
  99
 100         hash = 0;
 101         for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
 102                 hash += *bus_id;
 103         return hash & 0xff;
 104 }
 105
 106 #ifndef MODULE
 107 /*
 108  * The parameter parsing functions for builtin-drivers are called
 109  * before kmalloc works. Store the pointers to the parameters strings
 110  * into dasd[] for later processing.
 111  */
 112 static int __init
 113 dasd_call_setup(char *str)
 114 {
 115         static int count = 0;
 116
 117         if (count < 256)
 118                 dasd[count++] = str;
 119         return 1;
 120 }
 121
 122 __setup ("dasd=", dasd_call_setup);
 123 #endif  /* #ifndef MODULE */
 124
 125 #define DASD_IPLDEV     "ipldev"
 126
 127 /*
 128  * Read a device busid/devno from a string.
 129  */
 130 static int
 131
 132 dasd_busid(char **str, int *id0, int *id1, int *devno)
 133 {
 134         int val, old_style;
 135
 136         /* Interpret ipldev busid */
 137         if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
 138                 if (ipl_info.type != IPL_TYPE_CCW) {
 139                         pr_err("The IPL device is not a CCW device\n");
 140                         return -EINVAL;
 141                 }
 142                 *id0 = 0;
 143                 *id1 = ipl_info.data.ccw.dev_id.ssid;
 144                 *devno = ipl_info.data.ccw.dev_id.devno;
 145                 *str += strlen(DASD_IPLDEV);
 146
 147                 return 0;
 148         }
 149         /* check for leading '0x' */
 150         old_style = 0;
 151         if ((*str)[0] == '0' && (*str)[1] == 'x') {
 152                 *str += 2;
 153                 old_style = 1;
 154         }
 155         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 156                 return -EINVAL;
 157         val = simple_strtoul(*str, str, 16);
 158         if (old_style || (*str)[0] != '.') {
 159                 *id0 = *id1 = 0;
 160                 if (val < 0 || val > 0xffff)
 161                         return -EINVAL;
 162                 *devno = val;
 163                 return 0;
 164         }
 165         /* New style x.y.z busid */
 166         if (val < 0 || val > 0xff)
 167                 return -EINVAL;
 168         *id0 = val;
 169         (*str)++;
 170         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 171                 return -EINVAL;
 172         val = simple_strtoul(*str, str, 16);
 173         if (val < 0 || val > 0xff || (*str)++[0] != '.')
 174                 return -EINVAL;
 175         *id1 = val;
 176         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 177                 return -EINVAL;
 178         val = simple_strtoul(*str, str, 16);
 179         if (val < 0 || val > 0xffff)
 180                 return -EINVAL;
 181         *devno = val;
 182         return 0;
 183 }
 184
 185 /*
 186  * Read colon separated list of dasd features. Currently there is
 187  * only one: "ro" for read-only devices. The default feature set
 188  * is empty (value 0).
 189  */
 190 static int
 191 dasd_feature_list(char *str, char **endp)
 192 {
 193         int features, len, rc;
 194
 195         rc = 0;
 196         if (*str != '(') {
 197                 *endp = str;
 198                 return DASD_FEATURE_DEFAULT;
 199         }
 200         str++;
 201         features = 0;
 202
 203         while (1) {
 204                 for (len = 0;
 205                      str[len] && str[len] != ':' && str[len] != ')'; len++);
 206                 if (len == 2 && !strncmp(str, "ro", 2))
 207                         features |= DASD_FEATURE_READONLY;
 208                 else if (len == 4 && !strncmp(str, "diag", 4))
 209                         features |= DASD_FEATURE_USEDIAG;
 210                 else if (len == 3 && !strncmp(str, "raw", 3))
 211                         features |= DASD_FEATURE_USERAW;
 212                 else if (len == 6 && !strncmp(str, "erplog", 6))
 213                         features |= DASD_FEATURE_ERPLOG;
 214                 else if (len == 8 && !strncmp(str, "failfast", 8))
 215                         features |= DASD_FEATURE_FAILFAST;
 216                 else {
 217                         pr_warn("%*s is not a supported device option\n",
 218                                 len, str);
 219                         rc = -EINVAL;
 220                 }
 221                 str += len;
 222                 if (*str != ':')
 223                         break;
 224                 str++;
 225         }
 226         if (*str != ')') {
 227                 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
 228                 rc = -EINVAL;
 229         } else
 230                 str++;
 231         *endp = str;
 232         if (rc != 0)
 233                 return rc;
 234         return features;
 235 }
 236
 237 /*
 238  * Try to match the first element on the comma separated parse string
 239  * with one of the known keywords. If a keyword is found, take the approprate
 240  * action and return a pointer to the residual string. If the first element
 241  * could not be matched to any keyword then return an error code.
 242  */
 243 static char *
 244 dasd_parse_keyword( char *parsestring ) {
 245
 246         char *nextcomma, *residual_str;
 247         int length;
 248
 249         nextcomma = strchr(parsestring,',');
 250         if (nextcomma) {
 251                 length = nextcomma - parsestring;
 252                 residual_str = nextcomma + 1;
 253         } else {
 254                 length = strlen(parsestring);
 255                 residual_str = parsestring + length;
 256         }
 257         if (strncmp("autodetect", parsestring, length) == 0) {
 258                 dasd_autodetect = 1;
 259                 pr_info("The autodetection mode has been activated\n");
 260                 return residual_str;
 261         }
 262         if (strncmp("probeonly", parsestring, length) == 0) {
 263                 dasd_probeonly = 1;
 264                 pr_info("The probeonly mode has been activated\n");
 265                 return residual_str;
 266         }
 267         if (strncmp("nopav", parsestring, length) == 0) {
 268                 if (MACHINE_IS_VM)
 269                         pr_info("'nopav' is not supported on z/VM\n");
 270                 else {
 271                         dasd_nopav = 1;
 272                         pr_info("PAV support has be deactivated\n");
 273                 }
 274                 return residual_str;
 275         }
 276         if (strncmp("nofcx", parsestring, length) == 0) {
 277                 dasd_nofcx = 1;
 278                 pr_info("High Performance FICON support has been "
 279                         "deactivated\n");
 280                 return residual_str;
 281         }
 282         if (strncmp("fixedbuffers", parsestring, length) == 0) {
 283                 if (dasd_page_cache)
 284                         return residual_str;
 285                 dasd_page_cache =
 286                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
 287                                           PAGE_SIZE, SLAB_CACHE_DMA,
 288                                           NULL);
 289                 if (!dasd_page_cache)
 290                         DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
 291                                 "fixed buffer mode disabled.");
 292                 else
 293                         DBF_EVENT(DBF_INFO, "%s",
 294                                  "turning on fixed buffer mode");
 295                 return residual_str;
 296         }
 297         return ERR_PTR(-EINVAL);
 298 }
 299
 300 /*
 301  * Try to interprete the first element on the comma separated parse string
 302  * as a device number or a range of devices. If the interpretation is
 303  * successful, create the matching dasd_devmap entries and return a pointer
 304  * to the residual string.
 305  * If interpretation fails or in case of an error, return an error code.
 306  */
 307 static char *
 308 dasd_parse_range( char *parsestring ) {
 309
 310         struct dasd_devmap *devmap;
 311         int from, from_id0, from_id1;
 312         int to, to_id0, to_id1;
 313         int features, rc;
 314         char bus_id[DASD_BUS_ID_SIZE+1], *str;
 315
 316         str = parsestring;
 317         rc = dasd_busid(&str, &from_id0, &from_id1, &from);
 318         if (rc == 0) {
 319                 to = from;
 320                 to_id0 = from_id0;
 321                 to_id1 = from_id1;
 322                 if (*str == '-') {
 323                         str++;
 324                         rc = dasd_busid(&str, &to_id0, &to_id1, &to);
 325                 }
 326         }
 327         if (rc == 0 &&
 328             (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
 329                 rc = -EINVAL;
 330         if (rc) {
 331                 pr_err("%s is not a valid device range\n", parsestring);
 332                 return ERR_PTR(rc);
 333         }
 334         features = dasd_feature_list(str, &str);
 335         if (features < 0)
 336                 return ERR_PTR(-EINVAL);
 337         /* each device in dasd= parameter should be set initially online */
 338         features |= DASD_FEATURE_INITIAL_ONLINE;
 339         while (from <= to) {
 340                 sprintf(bus_id, "%01x.%01x.%04x",
 341                         from_id0, from_id1, from++);
 342                 devmap = dasd_add_busid(bus_id, features);
 343                 if (IS_ERR(devmap))
 344                         return (char *)devmap;
 345         }
 346         if (*str == ',')
 347                 return str + 1;
 348         if (*str == '\0')
 349                 return str;
 350         pr_warn("The dasd= parameter value %s has an invalid ending\n", str);
 351         return ERR_PTR(-EINVAL);
 352 }
 353
 354 static char *
 355 dasd_parse_next_element( char *parsestring ) {
 356         char * residual_str;
 357         residual_str = dasd_parse_keyword(parsestring);
 358         if (!IS_ERR(residual_str))
 359                 return residual_str;
 360         residual_str = dasd_parse_range(parsestring);
 361         return residual_str;
 362 }
 363
 364 /*
 365  * Parse parameters stored in dasd[]
 366  * The 'dasd=...' parameter allows to specify a comma separated list of
 367  * keywords and device ranges. When the dasd driver is build into the kernel,
 368  * the complete list will be stored as one element of the dasd[] array.
 369  * When the dasd driver is build as a module, then the list is broken into
 370  * it's elements and each dasd[] entry contains one element.
 371  */
 372 int
 373 dasd_parse(void)
 374 {
 375         int rc, i;
 376         char *parsestring;
 377
 378         rc = 0;
 379         for (i = 0; i < 256; i++) {
 380                 if (dasd[i] == NULL)
 381                         break;
 382                 parsestring = dasd[i];
 383                 /* loop over the comma separated list in the parsestring */
 384                 while (*parsestring) {
 385                         parsestring = dasd_parse_next_element(parsestring);
 386                         if(IS_ERR(parsestring)) {
 387                                 rc = PTR_ERR(parsestring);
 388                                 break;
 389                         }
 390                 }
 391                 if (rc) {
 392                         DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
 393                         break;
 394                 }
 395         }
 396         return rc;
 397 }
 398
 399 /*
 400  * Add a devmap for the device specified by busid. It is possible that
 401  * the devmap already exists (dasd= parameter). The order of the devices
 402  * added through this function will define the kdevs for the individual
 403  * devices.
 404  */
 405 static struct dasd_devmap *
 406 dasd_add_busid(const char *bus_id, int features)
 407 {
 408         struct dasd_devmap *devmap, *new, *tmp;
 409         int hash;
 410
 411         new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
 412         if (!new)
 413                 return ERR_PTR(-ENOMEM);
 414         spin_lock(&dasd_devmap_lock);
 415         devmap = NULL;
 416         hash = dasd_hash_busid(bus_id);
 417         list_for_each_entry(tmp, &dasd_hashlists[hash], list)
 418                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 419                         devmap = tmp;
 420                         break;
 421                 }
 422         if (!devmap) {
 423                 /* This bus_id is new. */
 424                 new->devindex = dasd_max_devindex++;
 425                 strncpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
 426                 new->features = features;
 427                 new->device = NULL;
 428                 list_add(&new->list, &dasd_hashlists[hash]);
 429                 devmap = new;
 430                 new = NULL;
 431         }
 432         spin_unlock(&dasd_devmap_lock);
 433         kfree(new);
 434         return devmap;
 435 }
 436
 437 /*
 438  * Find devmap for device with given bus_id.
 439  */
 440 static struct dasd_devmap *
 441 dasd_find_busid(const char *bus_id)
 442 {
 443         struct dasd_devmap *devmap, *tmp;
 444         int hash;
 445
 446         spin_lock(&dasd_devmap_lock);
 447         devmap = ERR_PTR(-ENODEV);
 448         hash = dasd_hash_busid(bus_id);
 449         list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
 450                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 451                         devmap = tmp;
 452                         break;
 453                 }
 454         }
 455         spin_unlock(&dasd_devmap_lock);
 456         return devmap;
 457 }
 458
 459 /*
 460  * Check if busid has been added to the list of dasd ranges.
 461  */
 462 int
 463 dasd_busid_known(const char *bus_id)
 464 {
 465         return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
 466 }
 467
 468 /*
 469  * Forget all about the device numbers added so far.
 470  * This may only be called at module unload or system shutdown.
 471  */
 472 static void
 473 dasd_forget_ranges(void)
 474 {
 475         struct dasd_devmap *devmap, *n;
 476         int i;
 477
 478         spin_lock(&dasd_devmap_lock);
 479         for (i = 0; i < 256; i++) {
 480                 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
 481                         BUG_ON(devmap->device != NULL);
 482                         list_del(&devmap->list);
 483                         kfree(devmap);
 484                 }
 485         }
 486         spin_unlock(&dasd_devmap_lock);
 487 }
 488
 489 /*
 490  * Find the device struct by its device index.
 491  */
 492 struct dasd_device *
 493 dasd_device_from_devindex(int devindex)
 494 {
 495         struct dasd_devmap *devmap, *tmp;
 496         struct dasd_device *device;
 497         int i;
 498
 499         spin_lock(&dasd_devmap_lock);
 500         devmap = NULL;
 501         for (i = 0; (i < 256) && !devmap; i++)
 502                 list_for_each_entry(tmp, &dasd_hashlists[i], list)
 503                         if (tmp->devindex == devindex) {
 504                                 /* Found the devmap for the device. */
 505                                 devmap = tmp;
 506                                 break;
 507                         }
 508         if (devmap && devmap->device) {
 509                 device = devmap->device;
 510                 dasd_get_device(device);
 511         } else
 512                 device = ERR_PTR(-ENODEV);
 513         spin_unlock(&dasd_devmap_lock);
 514         return device;
 515 }
 516
 517 /*
 518  * Return devmap for cdev. If no devmap exists yet, create one and
 519  * connect it to the cdev.
 520  */
 521 static struct dasd_devmap *
 522 dasd_devmap_from_cdev(struct ccw_device *cdev)
 523 {
 524         struct dasd_devmap *devmap;
 525
 526         devmap = dasd_find_busid(dev_name(&cdev->dev));
 527         if (IS_ERR(devmap))
 528                 devmap = dasd_add_busid(dev_name(&cdev->dev),
 529                                         DASD_FEATURE_DEFAULT);
 530         return devmap;
 531 }
 532
 533 /*
 534  * Create a dasd device structure for cdev.
 535  */
 536 struct dasd_device *
 537 dasd_create_device(struct ccw_device *cdev)
 538 {
 539         struct dasd_devmap *devmap;
 540         struct dasd_device *device;
 541         unsigned long flags;
 542         int rc;
 543
 544         devmap = dasd_devmap_from_cdev(cdev);
 545         if (IS_ERR(devmap))
 546                 return (void *) devmap;
 547
 548         device = dasd_alloc_device();
 549         if (IS_ERR(device))
 550                 return device;
 551         atomic_set(&device->ref_count, 3);
 552
 553         spin_lock(&dasd_devmap_lock);
 554         if (!devmap->device) {
 555                 devmap->device = device;
 556                 device->devindex = devmap->devindex;
 557                 device->features = devmap->features;
 558                 get_device(&cdev->dev);
 559                 device->cdev = cdev;
 560                 rc = 0;
 561         } else
 562                 /* Someone else was faster. */
 563                 rc = -EBUSY;
 564         spin_unlock(&dasd_devmap_lock);
 565
 566         if (rc) {
 567                 dasd_free_device(device);
 568                 return ERR_PTR(rc);
 569         }
 570
 571         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 572         dev_set_drvdata(&cdev->dev, device);
 573         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 574
 575         return device;
 576 }
 577
 578 /*
 579  * Wait queue for dasd_delete_device waits.
 580  */
 581 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
 582
 583 /*
 584  * Remove a dasd device structure. The passed referenced
 585  * is destroyed.
 586  */
 587 void
 588 dasd_delete_device(struct dasd_device *device)
 589 {
 590         struct ccw_device *cdev;
 591         struct dasd_devmap *devmap;
 592         unsigned long flags;
 593
 594         /* First remove device pointer from devmap. */
 595         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 596         BUG_ON(IS_ERR(devmap));
 597         spin_lock(&dasd_devmap_lock);
 598         if (devmap->device != device) {
 599                 spin_unlock(&dasd_devmap_lock);
 600                 dasd_put_device(device);
 601                 return;
 602         }
 603         devmap->device = NULL;
 604         spin_unlock(&dasd_devmap_lock);
 605
 606         /* Disconnect dasd_device structure from ccw_device structure. */
 607         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 608         dev_set_drvdata(&device->cdev->dev, NULL);
 609         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 610
 611         /*
 612          * Drop ref_count by 3, one for the devmap reference, one for
 613          * the cdev reference and one for the passed reference.
 614          */
 615         atomic_sub(3, &device->ref_count);
 616
 617         /* Wait for reference counter to drop to zero. */
 618         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 619
 620         dasd_generic_free_discipline(device);
 621         /* Disconnect dasd_device structure from ccw_device structure. */
 622         cdev = device->cdev;
 623         device->cdev = NULL;
 624
 625         /* Put ccw_device structure. */
 626         put_device(&cdev->dev);
 627
 628         /* Now the device structure can be freed. */
 629         dasd_free_device(device);
 630 }
 631
 632 /*
 633  * Reference counter dropped to zero. Wake up waiter
 634  * in dasd_delete_device.
 635  */
 636 void
 637 dasd_put_device_wake(struct dasd_device *device)
 638 {
 639         wake_up(&dasd_delete_wq);
 640 }
 641 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
 642
 643 /*
 644  * Return dasd_device structure associated with cdev.
 645  * This function needs to be called with the ccw device
 646  * lock held. It can be used from interrupt context.
 647  */
 648 struct dasd_device *
 649 dasd_device_from_cdev_locked(struct ccw_device *cdev)
 650 {
 651         struct dasd_device *device = dev_get_drvdata(&cdev->dev);
 652
 653         if (!device)
 654                 return ERR_PTR(-ENODEV);
 655         dasd_get_device(device);
 656         return device;
 657 }
 658
 659 /*
 660  * Return dasd_device structure associated with cdev.
 661  */
 662 struct dasd_device *
 663 dasd_device_from_cdev(struct ccw_device *cdev)
 664 {
 665         struct dasd_device *device;
 666         unsigned long flags;
 667
 668         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 669         device = dasd_device_from_cdev_locked(cdev);
 670         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 671         return device;
 672 }
 673
 674 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
 675 {
 676         struct dasd_devmap *devmap;
 677
 678         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 679         if (IS_ERR(devmap))
 680                 return;
 681         spin_lock(&dasd_devmap_lock);
 682         gdp->private_data = devmap;
 683         spin_unlock(&dasd_devmap_lock);
 684 }
 685
 686 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
 687 {
 688         struct dasd_device *device;
 689         struct dasd_devmap *devmap;
 690
 691         if (!gdp->private_data)
 692                 return NULL;
 693         device = NULL;
 694         spin_lock(&dasd_devmap_lock);
 695         devmap = gdp->private_data;
 696         if (devmap && devmap->device) {
 697                 device = devmap->device;
 698                 dasd_get_device(device);
 699         }
 700         spin_unlock(&dasd_devmap_lock);
 701         return device;
 702 }
 703
 704 /*
 705  * SECTION: files in sysfs
 706  */
 707
 708 /*
 709  * failfast controls the behaviour, if no path is available
 710  */
 711 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
 712                             char *buf)
 713 {
 714         struct dasd_devmap *devmap;
 715         int ff_flag;
 716
 717         devmap = dasd_find_busid(dev_name(dev));
 718         if (!IS_ERR(devmap))
 719                 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
 720         else
 721                 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
 722         return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
 723 }
 724
 725 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
 726               const char *buf, size_t count)
 727 {
 728         unsigned int val;
 729         int rc;
 730
 731         if (kstrtouint(buf, 0, &val) || val > 1)
 732                 return -EINVAL;
 733
 734         rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val);
 735
 736         return rc ? : count;
 737 }
 738
 739 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
 740
 741 /*
 742  * readonly controls the readonly status of a dasd
 743  */
 744 static ssize_t
 745 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 746 {
 747         struct dasd_devmap *devmap;
 748         int ro_flag;
 749
 750         devmap = dasd_find_busid(dev_name(dev));
 751         if (!IS_ERR(devmap))
 752                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
 753         else
 754                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
 755         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 756 }
 757
 758 static ssize_t
 759 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 760               const char *buf, size_t count)
 761 {
 762         struct ccw_device *cdev = to_ccwdev(dev);
 763         struct dasd_device *device;
 764         unsigned long flags;
 765         unsigned int val;
 766         int rc;
 767
 768         if (kstrtouint(buf, 0, &val) || val > 1)
 769                 return -EINVAL;
 770
 771         rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val);
 772         if (rc)
 773                 return rc;
 774
 775         device = dasd_device_from_cdev(cdev);
 776         if (IS_ERR(device))
 777                 return PTR_ERR(device);
 778
 779         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 780         val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 781
 782         if (!device->block || !device->block->gdp ||
 783             test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
 784                 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 785                 goto out;
 786         }
 787         /* Increase open_count to avoid losing the block device */
 788         atomic_inc(&device->block->open_count);
 789         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 790
 791         set_disk_ro(device->block->gdp, val);
 792         atomic_dec(&device->block->open_count);
 793
 794 out:
 795         dasd_put_device(device);
 796
 797         return count;
 798 }
 799
 800 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 801 /*
 802  * erplog controls the logging of ERP related data
 803  * (e.g. failing channel programs).
 804  */
 805 static ssize_t
 806 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 807 {
 808         struct dasd_devmap *devmap;
 809         int erplog;
 810
 811         devmap = dasd_find_busid(dev_name(dev));
 812         if (!IS_ERR(devmap))
 813                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 814         else
 815                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 816         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 817 }
 818
 819 static ssize_t
 820 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 821               const char *buf, size_t count)
 822 {
 823         unsigned int val;
 824         int rc;
 825
 826         if (kstrtouint(buf, 0, &val) || val > 1)
 827                 return -EINVAL;
 828
 829         rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val);
 830
 831         return rc ? : count;
 832 }
 833
 834 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 835
 836 /*
 837  * use_diag controls whether the driver should use diag rather than ssch
 838  * to talk to the device
 839  */
 840 static ssize_t
 841 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 842 {
 843         struct dasd_devmap *devmap;
 844         int use_diag;
 845
 846         devmap = dasd_find_busid(dev_name(dev));
 847         if (!IS_ERR(devmap))
 848                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 849         else
 850                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 851         return sprintf(buf, use_diag ? "1\n" : "0\n");
 852 }
 853
 854 static ssize_t
 855 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 856                     const char *buf, size_t count)
 857 {
 858         struct dasd_devmap *devmap;
 859         unsigned int val;
 860         ssize_t rc;
 861
 862         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 863         if (IS_ERR(devmap))
 864                 return PTR_ERR(devmap);
 865
 866         if (kstrtouint(buf, 0, &val) || val > 1)
 867                 return -EINVAL;
 868
 869         spin_lock(&dasd_devmap_lock);
 870         /* Changing diag discipline flag is only allowed in offline state. */
 871         rc = count;
 872         if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
 873                 if (val)
 874                         devmap->features |= DASD_FEATURE_USEDIAG;
 875                 else
 876                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 877         } else
 878                 rc = -EPERM;
 879         spin_unlock(&dasd_devmap_lock);
 880         return rc;
 881 }
 882
 883 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 884
 885 /*
 886  * use_raw controls whether the driver should give access to raw eckd data or
 887  * operate in standard mode
 888  */
 889 static ssize_t
 890 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
 891 {
 892         struct dasd_devmap *devmap;
 893         int use_raw;
 894
 895         devmap = dasd_find_busid(dev_name(dev));
 896         if (!IS_ERR(devmap))
 897                 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
 898         else
 899                 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
 900         return sprintf(buf, use_raw ? "1\n" : "0\n");
 901 }
 902
 903 static ssize_t
 904 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
 905                     const char *buf, size_t count)
 906 {
 907         struct dasd_devmap *devmap;
 908         ssize_t rc;
 909         unsigned long val;
 910
 911         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 912         if (IS_ERR(devmap))
 913                 return PTR_ERR(devmap);
 914
 915         if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
 916                 return -EINVAL;
 917
 918         spin_lock(&dasd_devmap_lock);
 919         /* Changing diag discipline flag is only allowed in offline state. */
 920         rc = count;
 921         if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
 922                 if (val)
 923                         devmap->features |= DASD_FEATURE_USERAW;
 924                 else
 925                         devmap->features &= ~DASD_FEATURE_USERAW;
 926         } else
 927                 rc = -EPERM;
 928         spin_unlock(&dasd_devmap_lock);
 929         return rc;
 930 }
 931
 932 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
 933                    dasd_use_raw_store);
 934
 935 static ssize_t
 936 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
 937                         const char *buf, size_t count)
 938 {
 939         struct ccw_device *cdev = to_ccwdev(dev);
 940         struct dasd_device *device;
 941         int rc;
 942
 943         device = dasd_device_from_cdev(cdev);
 944         if (IS_ERR(device)) {
 945                 rc = PTR_ERR(device);
 946                 goto out;
 947         }
 948
 949         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
 950             test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
 951                 /* Already doing offline processing */
 952                 dasd_put_device(device);
 953                 rc = -EBUSY;
 954                 goto out;
 955         }
 956
 957         set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
 958         dasd_put_device(device);
 959
 960         rc = ccw_device_set_offline(cdev);
 961
 962 out:
 963         return rc ? rc : count;
 964 }
 965
 966 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
 967
 968 static ssize_t
 969 dasd_access_show(struct device *dev, struct device_attribute *attr,
 970                  char *buf)
 971 {
 972         struct ccw_device *cdev = to_ccwdev(dev);
 973         struct dasd_device *device;
 974         int count;
 975
 976         device = dasd_device_from_cdev(cdev);
 977         if (IS_ERR(device))
 978                 return PTR_ERR(device);
 979
 980         if (!device->discipline)
 981                 count = -ENODEV;
 982         else if (!device->discipline->host_access_count)
 983                 count = -EOPNOTSUPP;
 984         else
 985                 count = device->discipline->host_access_count(device);
 986
 987         dasd_put_device(device);
 988         if (count < 0)
 989                 return count;
 990
 991         return sprintf(buf, "%d\n", count);
 992 }
 993
 994 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
 995
 996 static ssize_t
 997 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
 998                      char *buf)
 999 {
1000         struct dasd_device *device;
1001         ssize_t len;
1002
1003         device = dasd_device_from_cdev(to_ccwdev(dev));
1004         if (IS_ERR(device))
1005                 goto out;
1006         else if (!device->discipline) {
1007                 dasd_put_device(device);
1008                 goto out;
1009         } else {
1010                 len = snprintf(buf, PAGE_SIZE, "%s\n",
1011                                device->discipline->name);
1012                 dasd_put_device(device);
1013                 return len;
1014         }
1015 out:
1016         len = snprintf(buf, PAGE_SIZE, "none\n");
1017         return len;
1018 }
1019
1020 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1021
1022 static ssize_t
1023 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1024                      char *buf)
1025 {
1026         struct dasd_device *device;
1027         ssize_t len;
1028
1029         device = dasd_device_from_cdev(to_ccwdev(dev));
1030         if (!IS_ERR(device)) {
1031                 switch (device->state) {
1032                 case DASD_STATE_NEW:
1033                         len = snprintf(buf, PAGE_SIZE, "new\n");
1034                         break;
1035                 case DASD_STATE_KNOWN:
1036                         len = snprintf(buf, PAGE_SIZE, "detected\n");
1037                         break;
1038                 case DASD_STATE_BASIC:
1039                         len = snprintf(buf, PAGE_SIZE, "basic\n");
1040                         break;
1041                 case DASD_STATE_UNFMT:
1042                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1043                         break;
1044                 case DASD_STATE_READY:
1045                         len = snprintf(buf, PAGE_SIZE, "ready\n");
1046                         break;
1047                 case DASD_STATE_ONLINE:
1048                         len = snprintf(buf, PAGE_SIZE, "online\n");
1049                         break;
1050                 default:
1051                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
1052                         break;
1053                 }
1054                 dasd_put_device(device);
1055         } else
1056                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1057         return len;
1058 }
1059
1060 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1061
1062 static ssize_t dasd_alias_show(struct device *dev,
1063                                struct device_attribute *attr, char *buf)
1064 {
1065         struct dasd_device *device;
1066         struct dasd_uid uid;
1067
1068         device = dasd_device_from_cdev(to_ccwdev(dev));
1069         if (IS_ERR(device))
1070                 return sprintf(buf, "0\n");
1071
1072         if (device->discipline && device->discipline->get_uid &&
1073             !device->discipline->get_uid(device, &uid)) {
1074                 if (uid.type == UA_BASE_PAV_ALIAS ||
1075                     uid.type == UA_HYPER_PAV_ALIAS) {
1076                         dasd_put_device(device);
1077                         return sprintf(buf, "1\n");
1078                 }
1079         }
1080         dasd_put_device(device);
1081
1082         return sprintf(buf, "0\n");
1083 }
1084
1085 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1086
1087 static ssize_t dasd_vendor_show(struct device *dev,
1088                                 struct device_attribute *attr, char *buf)
1089 {
1090         struct dasd_device *device;
1091         struct dasd_uid uid;
1092         char *vendor;
1093
1094         device = dasd_device_from_cdev(to_ccwdev(dev));
1095         vendor = "";
1096         if (IS_ERR(device))
1097                 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1098
1099         if (device->discipline && device->discipline->get_uid &&
1100             !device->discipline->get_uid(device, &uid))
1101                         vendor = uid.vendor;
1102
1103         dasd_put_device(device);
1104
1105         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1106 }
1107
1108 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1109
1110 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1111                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1112                      /* vduit */ 32 + 1)
1113
1114 static ssize_t
1115 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1116 {
1117         struct dasd_device *device;
1118         struct dasd_uid uid;
1119         char uid_string[UID_STRLEN];
1120         char ua_string[3];
1121
1122         device = dasd_device_from_cdev(to_ccwdev(dev));
1123         uid_string[0] = 0;
1124         if (IS_ERR(device))
1125                 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1126
1127         if (device->discipline && device->discipline->get_uid &&
1128             !device->discipline->get_uid(device, &uid)) {
1129                 switch (uid.type) {
1130                 case UA_BASE_DEVICE:
1131                         snprintf(ua_string, sizeof(ua_string), "%02x",
1132                                  uid.real_unit_addr);
1133                         break;
1134                 case UA_BASE_PAV_ALIAS:
1135                         snprintf(ua_string, sizeof(ua_string), "%02x",
1136                                  uid.base_unit_addr);
1137                         break;
1138                 case UA_HYPER_PAV_ALIAS:
1139                         snprintf(ua_string, sizeof(ua_string), "xx");
1140                         break;
1141                 default:
1142                         /* should not happen, treat like base device */
1143                         snprintf(ua_string, sizeof(ua_string), "%02x",
1144                                  uid.real_unit_addr);
1145                         break;
1146                 }
1147
1148                 if (strlen(uid.vduit) > 0)
1149                         snprintf(uid_string, sizeof(uid_string),
1150                                  "%s.%s.%04x.%s.%s",
1151                                  uid.vendor, uid.serial, uid.ssid, ua_string,
1152                                  uid.vduit);
1153                 else
1154                         snprintf(uid_string, sizeof(uid_string),
1155                                  "%s.%s.%04x.%s",
1156                                  uid.vendor, uid.serial, uid.ssid, ua_string);
1157         }
1158         dasd_put_device(device);
1159
1160         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1161 }
1162 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1163
1164 /*
1165  * extended error-reporting
1166  */
1167 static ssize_t
1168 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1169 {
1170         struct dasd_devmap *devmap;
1171         int eer_flag;
1172
1173         devmap = dasd_find_busid(dev_name(dev));
1174         if (!IS_ERR(devmap) && devmap->device)
1175                 eer_flag = dasd_eer_enabled(devmap->device);
1176         else
1177                 eer_flag = 0;
1178         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1179 }
1180
1181 static ssize_t
1182 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1183                const char *buf, size_t count)
1184 {
1185         struct dasd_device *device;
1186         unsigned int val;
1187         int rc = 0;
1188
1189         device = dasd_device_from_cdev(to_ccwdev(dev));
1190         if (IS_ERR(device))
1191                 return PTR_ERR(device);
1192
1193         if (kstrtouint(buf, 0, &val) || val > 1)
1194                 return -EINVAL;
1195
1196         if (val)
1197                 rc = dasd_eer_enable(device);
1198         else
1199                 dasd_eer_disable(device);
1200
1201         dasd_put_device(device);
1202
1203         return rc ? : count;
1204 }
1205
1206 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1207
1208 /*
1209  * expiration time for default requests
1210  */
1211 static ssize_t
1212 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1213 {
1214         struct dasd_device *device;
1215         int len;
1216
1217         device = dasd_device_from_cdev(to_ccwdev(dev));
1218         if (IS_ERR(device))
1219                 return -ENODEV;
1220         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1221         dasd_put_device(device);
1222         return len;
1223 }
1224
1225 static ssize_t
1226 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1227                const char *buf, size_t count)
1228 {
1229         struct dasd_device *device;
1230         unsigned long val;
1231
1232         device = dasd_device_from_cdev(to_ccwdev(dev));
1233         if (IS_ERR(device))
1234                 return -ENODEV;
1235
1236         if ((kstrtoul(buf, 10, &val) != 0) ||
1237             (val > DASD_EXPIRES_MAX) || val == 0) {
1238                 dasd_put_device(device);
1239                 return -EINVAL;
1240         }
1241
1242         if (val)
1243                 device->default_expires = val;
1244
1245         dasd_put_device(device);
1246         return count;
1247 }
1248
1249 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1250
1251 static ssize_t
1252 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1253 {
1254         struct dasd_device *device;
1255         int len;
1256
1257         device = dasd_device_from_cdev(to_ccwdev(dev));
1258         if (IS_ERR(device))
1259                 return -ENODEV;
1260         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1261         dasd_put_device(device);
1262         return len;
1263 }
1264
1265 static ssize_t
1266 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1267                    const char *buf, size_t count)
1268 {
1269         struct dasd_device *device;
1270         unsigned long val;
1271
1272         device = dasd_device_from_cdev(to_ccwdev(dev));
1273         if (IS_ERR(device))
1274                 return -ENODEV;
1275
1276         if ((kstrtoul(buf, 10, &val) != 0) ||
1277             (val > DASD_RETRIES_MAX)) {
1278                 dasd_put_device(device);
1279                 return -EINVAL;
1280         }
1281
1282         if (val)
1283                 device->default_retries = val;
1284
1285         dasd_put_device(device);
1286         return count;
1287 }
1288
1289 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1290
1291 static ssize_t
1292 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1293                   char *buf)
1294 {
1295         struct dasd_device *device;
1296         int len;
1297
1298         device = dasd_device_from_cdev(to_ccwdev(dev));
1299         if (IS_ERR(device))
1300                 return -ENODEV;
1301         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1302         dasd_put_device(device);
1303         return len;
1304 }
1305
1306 static ssize_t
1307 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1308                    const char *buf, size_t count)
1309 {
1310         struct dasd_device *device;
1311         struct request_queue *q;
1312         unsigned long val, flags;
1313
1314         device = dasd_device_from_cdev(to_ccwdev(dev));
1315         if (IS_ERR(device) || !device->block)
1316                 return -ENODEV;
1317
1318         if ((kstrtoul(buf, 10, &val) != 0) ||
1319             val > UINT_MAX / HZ) {
1320                 dasd_put_device(device);
1321                 return -EINVAL;
1322         }
1323         q = device->block->request_queue;
1324         if (!q) {
1325                 dasd_put_device(device);
1326                 return -ENODEV;
1327         }
1328         spin_lock_irqsave(&device->block->request_queue_lock, flags);
1329         if (!val)
1330                 blk_queue_rq_timed_out(q, NULL);
1331         else
1332                 blk_queue_rq_timed_out(q, dasd_times_out);
1333
1334         device->blk_timeout = val;
1335
1336         blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1337         spin_unlock_irqrestore(&device->block->request_queue_lock, flags);
1338
1339         dasd_put_device(device);
1340         return count;
1341 }
1342
1343 static DEVICE_ATTR(timeout, 0644,
1344                    dasd_timeout_show, dasd_timeout_store);
1345
1346
1347 static ssize_t
1348 dasd_path_reset_store(struct device *dev, struct device_attribute *attr,
1349                       const char *buf, size_t count)
1350 {
1351         struct dasd_device *device;
1352         unsigned int val;
1353
1354         device = dasd_device_from_cdev(to_ccwdev(dev));
1355         if (IS_ERR(device))
1356                 return -ENODEV;
1357
1358         if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff)
1359                 val = 0;
1360
1361         if (device->discipline && device->discipline->reset_path)
1362                 device->discipline->reset_path(device, (__u8) val);
1363
1364         dasd_put_device(device);
1365         return count;
1366 }
1367
1368 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store);
1369
1370 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr,
1371                              char *buf)
1372 {
1373         struct dasd_device *device;
1374         int hpf;
1375
1376         device = dasd_device_from_cdev(to_ccwdev(dev));
1377         if (IS_ERR(device))
1378                 return -ENODEV;
1379         if (!device->discipline || !device->discipline->hpf_enabled) {
1380                 dasd_put_device(device);
1381                 return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx);
1382         }
1383         hpf = device->discipline->hpf_enabled(device);
1384         dasd_put_device(device);
1385         return snprintf(buf, PAGE_SIZE, "%d\n", hpf);
1386 }
1387
1388 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL);
1389
1390 static ssize_t dasd_reservation_policy_show(struct device *dev,
1391                                             struct device_attribute *attr,
1392                                             char *buf)
1393 {
1394         struct dasd_devmap *devmap;
1395         int rc = 0;
1396
1397         devmap = dasd_find_busid(dev_name(dev));
1398         if (IS_ERR(devmap)) {
1399                 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1400         } else {
1401                 spin_lock(&dasd_devmap_lock);
1402                 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1403                         rc = snprintf(buf, PAGE_SIZE, "fail\n");
1404                 else
1405                         rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1406                 spin_unlock(&dasd_devmap_lock);
1407         }
1408         return rc;
1409 }
1410
1411 static ssize_t dasd_reservation_policy_store(struct device *dev,
1412                                              struct device_attribute *attr,
1413                                              const char *buf, size_t count)
1414 {
1415         struct ccw_device *cdev = to_ccwdev(dev);
1416         int rc;
1417
1418         if (sysfs_streq("ignore", buf))
1419                 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0);
1420         else if (sysfs_streq("fail", buf))
1421                 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1);
1422         else
1423                 rc = -EINVAL;
1424
1425         return rc ? : count;
1426 }
1427
1428 static DEVICE_ATTR(reservation_policy, 0644,
1429                    dasd_reservation_policy_show, dasd_reservation_policy_store);
1430
1431 static ssize_t dasd_reservation_state_show(struct device *dev,
1432                                            struct device_attribute *attr,
1433                                            char *buf)
1434 {
1435         struct dasd_device *device;
1436         int rc = 0;
1437
1438         device = dasd_device_from_cdev(to_ccwdev(dev));
1439         if (IS_ERR(device))
1440                 return snprintf(buf, PAGE_SIZE, "none\n");
1441
1442         if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1443                 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1444         else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1445                 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1446         else
1447                 rc = snprintf(buf, PAGE_SIZE, "none\n");
1448         dasd_put_device(device);
1449         return rc;
1450 }
1451
1452 static ssize_t dasd_reservation_state_store(struct device *dev,
1453                                             struct device_attribute *attr,
1454                                             const char *buf, size_t count)
1455 {
1456         struct dasd_device *device;
1457         int rc = 0;
1458
1459         device = dasd_device_from_cdev(to_ccwdev(dev));
1460         if (IS_ERR(device))
1461                 return -ENODEV;
1462         if (sysfs_streq("reset", buf))
1463                 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1464         else
1465                 rc = -EINVAL;
1466         dasd_put_device(device);
1467
1468         if (rc)
1469                 return rc;
1470         else
1471                 return count;
1472 }
1473
1474 static DEVICE_ATTR(last_known_reservation_state, 0644,
1475                    dasd_reservation_state_show, dasd_reservation_state_store);
1476
1477 static ssize_t dasd_pm_show(struct device *dev,
1478                               struct device_attribute *attr, char *buf)
1479 {
1480         struct dasd_device *device;
1481         u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm;
1482
1483         device = dasd_device_from_cdev(to_ccwdev(dev));
1484         if (IS_ERR(device))
1485                 return sprintf(buf, "0\n");
1486
1487         opm = dasd_path_get_opm(device);
1488         nppm = dasd_path_get_nppm(device);
1489         cablepm = dasd_path_get_cablepm(device);
1490         cuirpm = dasd_path_get_cuirpm(device);
1491         hpfpm = dasd_path_get_hpfpm(device);
1492         ifccpm = dasd_path_get_ifccpm(device);
1493         dasd_put_device(device);
1494
1495         return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm,
1496                        cablepm, cuirpm, hpfpm, ifccpm);
1497 }
1498
1499 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1500
1501 /*
1502  * threshold value for IFCC/CCC errors
1503  */
1504 static ssize_t
1505 dasd_path_threshold_show(struct device *dev,
1506                           struct device_attribute *attr, char *buf)
1507 {
1508         struct dasd_device *device;
1509         int len;
1510
1511         device = dasd_device_from_cdev(to_ccwdev(dev));
1512         if (IS_ERR(device))
1513                 return -ENODEV;
1514         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld);
1515         dasd_put_device(device);
1516         return len;
1517 }
1518
1519 static ssize_t
1520 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
1521                            const char *buf, size_t count)
1522 {
1523         struct dasd_device *device;
1524         unsigned long flags;
1525         unsigned long val;
1526
1527         device = dasd_device_from_cdev(to_ccwdev(dev));
1528         if (IS_ERR(device))
1529                 return -ENODEV;
1530
1531         if ((kstrtoul(buf, 10, &val) != 0) ||
1532             (val > DASD_THRHLD_MAX) || val == 0) {
1533                 dasd_put_device(device);
1534                 return -EINVAL;
1535         }
1536         spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1537         if (val)
1538                 device->path_thrhld = val;
1539         spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1540         dasd_put_device(device);
1541         return count;
1542 }
1543
1544 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
1545                    dasd_path_threshold_store);
1546 /*
1547  * interval for IFCC/CCC checks
1548  * meaning time with no IFCC/CCC error before the error counter
1549  * gets reset
1550  */
1551 static ssize_t
1552 dasd_path_interval_show(struct device *dev,
1553                         struct device_attribute *attr, char *buf)
1554 {
1555         struct dasd_device *device;
1556         int len;
1557
1558         device = dasd_device_from_cdev(to_ccwdev(dev));
1559         if (IS_ERR(device))
1560                 return -ENODEV;
1561         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval);
1562         dasd_put_device(device);
1563         return len;
1564 }
1565
1566 static ssize_t
1567 dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
1568                const char *buf, size_t count)
1569 {
1570         struct dasd_device *device;
1571         unsigned long flags;
1572         unsigned long val;
1573
1574         device = dasd_device_from_cdev(to_ccwdev(dev));
1575         if (IS_ERR(device))
1576                 return -ENODEV;
1577
1578         if ((kstrtoul(buf, 10, &val) != 0) ||
1579             (val > DASD_INTERVAL_MAX) || val == 0) {
1580                 dasd_put_device(device);
1581                 return -EINVAL;
1582         }
1583         spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1584         if (val)
1585                 device->path_interval = val;
1586         spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1587         dasd_put_device(device);
1588         return count;
1589 }
1590
1591 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
1592                    dasd_path_interval_store);
1593
1594
1595 static struct attribute * dasd_attrs[] = {
1596         &dev_attr_readonly.attr,
1597         &dev_attr_discipline.attr,
1598         &dev_attr_status.attr,
1599         &dev_attr_alias.attr,
1600         &dev_attr_vendor.attr,
1601         &dev_attr_uid.attr,
1602         &dev_attr_use_diag.attr,
1603         &dev_attr_raw_track_access.attr,
1604         &dev_attr_eer_enabled.attr,
1605         &dev_attr_erplog.attr,
1606         &dev_attr_failfast.attr,
1607         &dev_attr_expires.attr,
1608         &dev_attr_retries.attr,
1609         &dev_attr_timeout.attr,
1610         &dev_attr_reservation_policy.attr,
1611         &dev_attr_last_known_reservation_state.attr,
1612         &dev_attr_safe_offline.attr,
1613         &dev_attr_host_access_count.attr,
1614         &dev_attr_path_masks.attr,
1615         &dev_attr_path_threshold.attr,
1616         &dev_attr_path_interval.attr,
1617         &dev_attr_path_reset.attr,
1618         &dev_attr_hpf.attr,
1619         NULL,
1620 };
1621
1622 static struct attribute_group dasd_attr_group = {
1623         .attrs = dasd_attrs,
1624 };
1625
1626 /*
1627  * Return value of the specified feature.
1628  */
1629 int
1630 dasd_get_feature(struct ccw_device *cdev, int feature)
1631 {
1632         struct dasd_devmap *devmap;
1633
1634         devmap = dasd_find_busid(dev_name(&cdev->dev));
1635         if (IS_ERR(devmap))
1636                 return PTR_ERR(devmap);
1637
1638         return ((devmap->features & feature) != 0);
1639 }
1640
1641 /*
1642  * Set / reset given feature.
1643  * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1644  */
1645 int
1646 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1647 {
1648         struct dasd_devmap *devmap;
1649
1650         devmap = dasd_devmap_from_cdev(cdev);
1651         if (IS_ERR(devmap))
1652                 return PTR_ERR(devmap);
1653
1654         spin_lock(&dasd_devmap_lock);
1655         if (flag)
1656                 devmap->features |= feature;
1657         else
1658                 devmap->features &= ~feature;
1659         if (devmap->device)
1660                 devmap->device->features = devmap->features;
1661         spin_unlock(&dasd_devmap_lock);
1662         return 0;
1663 }
1664
1665
1666 int
1667 dasd_add_sysfs_files(struct ccw_device *cdev)
1668 {
1669         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1670 }
1671
1672 void
1673 dasd_remove_sysfs_files(struct ccw_device *cdev)
1674 {
1675         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1676 }
1677
1678
1679 int
1680 dasd_devmap_init(void)
1681 {
1682         int i;
1683
1684         /* Initialize devmap structures. */
1685         dasd_max_devindex = 0;
1686         for (i = 0; i < 256; i++)
1687                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1688         return 0;
1689 }
1690
1691 void
1692 dasd_devmap_exit(void)
1693 {
1694         dasd_forget_ranges();
1695 }