git.oblomov.eu Git - linux-2.6/blob - drivers/s390/block/dasd_devmap.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_devmap.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
   9  *
  10  * Device mapping and dasd= parameter parsing functions. All devmap
  11  * functions may not be called from interrupt context. In particular
  12  * dasd_get_device is a no-no from interrupt context.
  13  *
  14  */
  15
  16 #include <linux/ctype.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19
  20 #include <asm/debug.h>
  21 #include <asm/uaccess.h>
  22 #include <asm/ipl.h>
  23
  24 /* This is ugly... */
  25 #define PRINTK_HEADER "dasd_devmap:"
  26
  27 #include "dasd_int.h"
  28
  29 struct kmem_cache *dasd_page_cache;
  30 EXPORT_SYMBOL_GPL(dasd_page_cache);
  31
  32 /*
  33  * dasd_devmap_t is used to store the features and the relation
  34  * between device number and device index. To find a dasd_devmap_t
  35  * that corresponds to a device number of a device index each
  36  * dasd_devmap_t is added to two linked lists, one to search by
  37  * the device number and one to search by the device index. As
  38  * soon as big minor numbers are available the device index list
  39  * can be removed since the device number will then be identical
  40  * to the device index.
  41  */
  42 struct dasd_devmap {
  43         struct list_head list;
  44         char bus_id[BUS_ID_SIZE];
  45         unsigned int devindex;
  46         unsigned short features;
  47         struct dasd_device *device;
  48         struct dasd_uid uid;
  49 };
  50
  51 /*
  52  * Parameter parsing functions for dasd= parameter. The syntax is:
  53  *   <devno>            : (0x)?[0-9a-fA-F]+
  54  *   <busid>            : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
  55  *   <feature>          : ro
  56  *   <feature_list>     : \(<feature>(:<feature>)*\)
  57  *   <devno-range>      : <devno>(-<devno>)?<feature_list>?
  58  *   <busid-range>      : <busid>(-<busid>)?<feature_list>?
  59  *   <devices>          : <devno-range>|<busid-range>
  60  *   <dasd_module>      : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
  61  *
  62  *   <dasd>             : autodetect|probeonly|<devices>(,<devices>)*
  63  */
  64
  65 int dasd_probeonly =  0;        /* is true, when probeonly mode is active */
  66 int dasd_autodetect = 0;        /* is true, when autodetection is active */
  67 int dasd_nopav = 0;             /* is true, when PAV is disabled */
  68 EXPORT_SYMBOL_GPL(dasd_nopav);
  69
  70 /*
  71  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
  72  * it is named 'dasd' to directly be filled by insmod with the comma separated
  73  * strings when running as a module.
  74  */
  75 static char *dasd[256];
  76 module_param_array(dasd, charp, NULL, 0);
  77
  78 /*
  79  * Single spinlock to protect devmap and servermap structures and lists.
  80  */
  81 static DEFINE_SPINLOCK(dasd_devmap_lock);
  82
  83 /*
  84  * Hash lists for devmap structures.
  85  */
  86 static struct list_head dasd_hashlists[256];
  87 int dasd_max_devindex;
  88
  89 static struct dasd_devmap *dasd_add_busid(const char *, int);
  90
  91 static inline int
  92 dasd_hash_busid(const char *bus_id)
  93 {
  94         int hash, i;
  95
  96         hash = 0;
  97         for (i = 0; (i < BUS_ID_SIZE) && *bus_id; i++, bus_id++)
  98                 hash += *bus_id;
  99         return hash & 0xff;
 100 }
 101
 102 #ifndef MODULE
 103 /*
 104  * The parameter parsing functions for builtin-drivers are called
 105  * before kmalloc works. Store the pointers to the parameters strings
 106  * into dasd[] for later processing.
 107  */
 108 static int __init
 109 dasd_call_setup(char *str)
 110 {
 111         static int count = 0;
 112
 113         if (count < 256)
 114                 dasd[count++] = str;
 115         return 1;
 116 }
 117
 118 __setup ("dasd=", dasd_call_setup);
 119 #endif  /* #ifndef MODULE */
 120
 121 #define DASD_IPLDEV     "ipldev"
 122
 123 /*
 124  * Read a device busid/devno from a string.
 125  */
 126 static int
 127 dasd_busid(char **str, int *id0, int *id1, int *devno)
 128 {
 129         int val, old_style;
 130
 131         /* Interpret ipldev busid */
 132         if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
 133                 if (ipl_info.type != IPL_TYPE_CCW) {
 134                         MESSAGE(KERN_ERR, "%s", "ipl device is not a ccw "
 135                                 "device");
 136                         return -EINVAL;
 137                 }
 138                 *id0 = 0;
 139                 *id1 = ipl_info.data.ccw.dev_id.ssid;
 140                 *devno = ipl_info.data.ccw.dev_id.devno;
 141                 *str += strlen(DASD_IPLDEV);
 142
 143                 return 0;
 144         }
 145         /* check for leading '0x' */
 146         old_style = 0;
 147         if ((*str)[0] == '0' && (*str)[1] == 'x') {
 148                 *str += 2;
 149                 old_style = 1;
 150         }
 151         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 152                 return -EINVAL;
 153         val = simple_strtoul(*str, str, 16);
 154         if (old_style || (*str)[0] != '.') {
 155                 *id0 = *id1 = 0;
 156                 if (val < 0 || val > 0xffff)
 157                         return -EINVAL;
 158                 *devno = val;
 159                 return 0;
 160         }
 161         /* New style x.y.z busid */
 162         if (val < 0 || val > 0xff)
 163                 return -EINVAL;
 164         *id0 = val;
 165         (*str)++;
 166         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 167                 return -EINVAL;
 168         val = simple_strtoul(*str, str, 16);
 169         if (val < 0 || val > 0xff || (*str)++[0] != '.')
 170                 return -EINVAL;
 171         *id1 = val;
 172         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 173                 return -EINVAL;
 174         val = simple_strtoul(*str, str, 16);
 175         if (val < 0 || val > 0xffff)
 176                 return -EINVAL;
 177         *devno = val;
 178         return 0;
 179 }
 180
 181 /*
 182  * Read colon separated list of dasd features. Currently there is
 183  * only one: "ro" for read-only devices. The default feature set
 184  * is empty (value 0).
 185  */
 186 static int
 187 dasd_feature_list(char *str, char **endp)
 188 {
 189         int features, len, rc;
 190
 191         rc = 0;
 192         if (*str != '(') {
 193                 *endp = str;
 194                 return DASD_FEATURE_DEFAULT;
 195         }
 196         str++;
 197         features = 0;
 198
 199         while (1) {
 200                 for (len = 0;
 201                      str[len] && str[len] != ':' && str[len] != ')'; len++);
 202                 if (len == 2 && !strncmp(str, "ro", 2))
 203                         features |= DASD_FEATURE_READONLY;
 204                 else if (len == 4 && !strncmp(str, "diag", 4))
 205                         features |= DASD_FEATURE_USEDIAG;
 206                 else if (len == 6 && !strncmp(str, "erplog", 6))
 207                         features |= DASD_FEATURE_ERPLOG;
 208                 else {
 209                         MESSAGE(KERN_WARNING,
 210                                 "unsupported feature: %*s, "
 211                                 "ignoring setting", len, str);
 212                         rc = -EINVAL;
 213                 }
 214                 str += len;
 215                 if (*str != ':')
 216                         break;
 217                 str++;
 218         }
 219         if (*str != ')') {
 220                 MESSAGE(KERN_WARNING, "%s",
 221                         "missing ')' in dasd parameter string\n");
 222                 rc = -EINVAL;
 223         } else
 224                 str++;
 225         *endp = str;
 226         if (rc != 0)
 227                 return rc;
 228         return features;
 229 }
 230
 231 /*
 232  * Try to match the first element on the comma separated parse string
 233  * with one of the known keywords. If a keyword is found, take the approprate
 234  * action and return a pointer to the residual string. If the first element
 235  * could not be matched to any keyword then return an error code.
 236  */
 237 static char *
 238 dasd_parse_keyword( char *parsestring ) {
 239
 240         char *nextcomma, *residual_str;
 241         int length;
 242
 243         nextcomma = strchr(parsestring,',');
 244         if (nextcomma) {
 245                 length = nextcomma - parsestring;
 246                 residual_str = nextcomma + 1;
 247         } else {
 248                 length = strlen(parsestring);
 249                 residual_str = parsestring + length;
 250         }
 251         if (strncmp("autodetect", parsestring, length) == 0) {
 252                 dasd_autodetect = 1;
 253                 MESSAGE (KERN_INFO, "%s",
 254                          "turning to autodetection mode");
 255                 return residual_str;
 256         }
 257         if (strncmp("probeonly", parsestring, length) == 0) {
 258                 dasd_probeonly = 1;
 259                 MESSAGE(KERN_INFO, "%s",
 260                         "turning to probeonly mode");
 261                 return residual_str;
 262         }
 263         if (strncmp("nopav", parsestring, length) == 0) {
 264                 if (MACHINE_IS_VM)
 265                         MESSAGE(KERN_INFO, "%s", "'nopav' not supported on VM");
 266                 else {
 267                         dasd_nopav = 1;
 268                         MESSAGE(KERN_INFO, "%s", "disable PAV mode");
 269                 }
 270                 return residual_str;
 271         }
 272         if (strncmp("fixedbuffers", parsestring, length) == 0) {
 273                 if (dasd_page_cache)
 274                         return residual_str;
 275                 dasd_page_cache =
 276                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
 277                                           PAGE_SIZE, SLAB_CACHE_DMA,
 278                                           NULL);
 279                 if (!dasd_page_cache)
 280                         MESSAGE(KERN_WARNING, "%s", "Failed to create slab, "
 281                                 "fixed buffer mode disabled.");
 282                 else
 283                         MESSAGE (KERN_INFO, "%s",
 284                                  "turning on fixed buffer mode");
 285                 return residual_str;
 286         }
 287         return ERR_PTR(-EINVAL);
 288 }
 289
 290 /*
 291  * Try to interprete the first element on the comma separated parse string
 292  * as a device number or a range of devices. If the interpretation is
 293  * successfull, create the matching dasd_devmap entries and return a pointer
 294  * to the residual string.
 295  * If interpretation fails or in case of an error, return an error code.
 296  */
 297 static char *
 298 dasd_parse_range( char *parsestring ) {
 299
 300         struct dasd_devmap *devmap;
 301         int from, from_id0, from_id1;
 302         int to, to_id0, to_id1;
 303         int features, rc;
 304         char bus_id[BUS_ID_SIZE+1], *str;
 305
 306         str = parsestring;
 307         rc = dasd_busid(&str, &from_id0, &from_id1, &from);
 308         if (rc == 0) {
 309                 to = from;
 310                 to_id0 = from_id0;
 311                 to_id1 = from_id1;
 312                 if (*str == '-') {
 313                         str++;
 314                         rc = dasd_busid(&str, &to_id0, &to_id1, &to);
 315                 }
 316         }
 317         if (rc == 0 &&
 318             (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
 319                 rc = -EINVAL;
 320         if (rc) {
 321                 MESSAGE(KERN_ERR, "Invalid device range %s", parsestring);
 322                 return ERR_PTR(rc);
 323         }
 324         features = dasd_feature_list(str, &str);
 325         if (features < 0)
 326                 return ERR_PTR(-EINVAL);
 327         /* each device in dasd= parameter should be set initially online */
 328         features |= DASD_FEATURE_INITIAL_ONLINE;
 329         while (from <= to) {
 330                 sprintf(bus_id, "%01x.%01x.%04x",
 331                         from_id0, from_id1, from++);
 332                 devmap = dasd_add_busid(bus_id, features);
 333                 if (IS_ERR(devmap))
 334                         return (char *)devmap;
 335         }
 336         if (*str == ',')
 337                 return str + 1;
 338         if (*str == '\0')
 339                 return str;
 340         MESSAGE(KERN_WARNING,
 341                 "junk at end of dasd parameter string: %s\n", str);
 342         return ERR_PTR(-EINVAL);
 343 }
 344
 345 static char *
 346 dasd_parse_next_element( char *parsestring ) {
 347         char * residual_str;
 348         residual_str = dasd_parse_keyword(parsestring);
 349         if (!IS_ERR(residual_str))
 350                 return residual_str;
 351         residual_str = dasd_parse_range(parsestring);
 352         return residual_str;
 353 }
 354
 355 /*
 356  * Parse parameters stored in dasd[]
 357  * The 'dasd=...' parameter allows to specify a comma separated list of
 358  * keywords and device ranges. When the dasd driver is build into the kernel,
 359  * the complete list will be stored as one element of the dasd[] array.
 360  * When the dasd driver is build as a module, then the list is broken into
 361  * it's elements and each dasd[] entry contains one element.
 362  */
 363 int
 364 dasd_parse(void)
 365 {
 366         int rc, i;
 367         char *parsestring;
 368
 369         rc = 0;
 370         for (i = 0; i < 256; i++) {
 371                 if (dasd[i] == NULL)
 372                         break;
 373                 parsestring = dasd[i];
 374                 /* loop over the comma separated list in the parsestring */
 375                 while (*parsestring) {
 376                         parsestring = dasd_parse_next_element(parsestring);
 377                         if(IS_ERR(parsestring)) {
 378                                 rc = PTR_ERR(parsestring);
 379                                 break;
 380                         }
 381                 }
 382                 if (rc) {
 383                         DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
 384                         break;
 385                 }
 386         }
 387         return rc;
 388 }
 389
 390 /*
 391  * Add a devmap for the device specified by busid. It is possible that
 392  * the devmap already exists (dasd= parameter). The order of the devices
 393  * added through this function will define the kdevs for the individual
 394  * devices.
 395  */
 396 static struct dasd_devmap *
 397 dasd_add_busid(const char *bus_id, int features)
 398 {
 399         struct dasd_devmap *devmap, *new, *tmp;
 400         int hash;
 401
 402         new = (struct dasd_devmap *)
 403                 kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
 404         if (!new)
 405                 return ERR_PTR(-ENOMEM);
 406         spin_lock(&dasd_devmap_lock);
 407         devmap = NULL;
 408         hash = dasd_hash_busid(bus_id);
 409         list_for_each_entry(tmp, &dasd_hashlists[hash], list)
 410                 if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) {
 411                         devmap = tmp;
 412                         break;
 413                 }
 414         if (!devmap) {
 415                 /* This bus_id is new. */
 416                 new->devindex = dasd_max_devindex++;
 417                 strncpy(new->bus_id, bus_id, BUS_ID_SIZE);
 418                 new->features = features;
 419                 new->device = NULL;
 420                 list_add(&new->list, &dasd_hashlists[hash]);
 421                 devmap = new;
 422                 new = NULL;
 423         }
 424         spin_unlock(&dasd_devmap_lock);
 425         kfree(new);
 426         return devmap;
 427 }
 428
 429 /*
 430  * Find devmap for device with given bus_id.
 431  */
 432 static struct dasd_devmap *
 433 dasd_find_busid(const char *bus_id)
 434 {
 435         struct dasd_devmap *devmap, *tmp;
 436         int hash;
 437
 438         spin_lock(&dasd_devmap_lock);
 439         devmap = ERR_PTR(-ENODEV);
 440         hash = dasd_hash_busid(bus_id);
 441         list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
 442                 if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) {
 443                         devmap = tmp;
 444                         break;
 445                 }
 446         }
 447         spin_unlock(&dasd_devmap_lock);
 448         return devmap;
 449 }
 450
 451 /*
 452  * Check if busid has been added to the list of dasd ranges.
 453  */
 454 int
 455 dasd_busid_known(const char *bus_id)
 456 {
 457         return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
 458 }
 459
 460 /*
 461  * Forget all about the device numbers added so far.
 462  * This may only be called at module unload or system shutdown.
 463  */
 464 static void
 465 dasd_forget_ranges(void)
 466 {
 467         struct dasd_devmap *devmap, *n;
 468         int i;
 469
 470         spin_lock(&dasd_devmap_lock);
 471         for (i = 0; i < 256; i++) {
 472                 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
 473                         BUG_ON(devmap->device != NULL);
 474                         list_del(&devmap->list);
 475                         kfree(devmap);
 476                 }
 477         }
 478         spin_unlock(&dasd_devmap_lock);
 479 }
 480
 481 /*
 482  * Find the device struct by its device index.
 483  */
 484 struct dasd_device *
 485 dasd_device_from_devindex(int devindex)
 486 {
 487         struct dasd_devmap *devmap, *tmp;
 488         struct dasd_device *device;
 489         int i;
 490
 491         spin_lock(&dasd_devmap_lock);
 492         devmap = NULL;
 493         for (i = 0; (i < 256) && !devmap; i++)
 494                 list_for_each_entry(tmp, &dasd_hashlists[i], list)
 495                         if (tmp->devindex == devindex) {
 496                                 /* Found the devmap for the device. */
 497                                 devmap = tmp;
 498                                 break;
 499                         }
 500         if (devmap && devmap->device) {
 501                 device = devmap->device;
 502                 dasd_get_device(device);
 503         } else
 504                 device = ERR_PTR(-ENODEV);
 505         spin_unlock(&dasd_devmap_lock);
 506         return device;
 507 }
 508
 509 /*
 510  * Return devmap for cdev. If no devmap exists yet, create one and
 511  * connect it to the cdev.
 512  */
 513 static struct dasd_devmap *
 514 dasd_devmap_from_cdev(struct ccw_device *cdev)
 515 {
 516         struct dasd_devmap *devmap;
 517
 518         devmap = dasd_find_busid(dev_name(&cdev->dev));
 519         if (IS_ERR(devmap))
 520                 devmap = dasd_add_busid(dev_name(&cdev->dev),
 521                                         DASD_FEATURE_DEFAULT);
 522         return devmap;
 523 }
 524
 525 /*
 526  * Create a dasd device structure for cdev.
 527  */
 528 struct dasd_device *
 529 dasd_create_device(struct ccw_device *cdev)
 530 {
 531         struct dasd_devmap *devmap;
 532         struct dasd_device *device;
 533         unsigned long flags;
 534         int rc;
 535
 536         devmap = dasd_devmap_from_cdev(cdev);
 537         if (IS_ERR(devmap))
 538                 return (void *) devmap;
 539
 540         device = dasd_alloc_device();
 541         if (IS_ERR(device))
 542                 return device;
 543         atomic_set(&device->ref_count, 3);
 544
 545         spin_lock(&dasd_devmap_lock);
 546         if (!devmap->device) {
 547                 devmap->device = device;
 548                 device->devindex = devmap->devindex;
 549                 device->features = devmap->features;
 550                 get_device(&cdev->dev);
 551                 device->cdev = cdev;
 552                 rc = 0;
 553         } else
 554                 /* Someone else was faster. */
 555                 rc = -EBUSY;
 556         spin_unlock(&dasd_devmap_lock);
 557
 558         if (rc) {
 559                 dasd_free_device(device);
 560                 return ERR_PTR(rc);
 561         }
 562
 563         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 564         cdev->dev.driver_data = device;
 565         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 566
 567         return device;
 568 }
 569
 570 /*
 571  * Wait queue for dasd_delete_device waits.
 572  */
 573 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
 574
 575 /*
 576  * Remove a dasd device structure. The passed referenced
 577  * is destroyed.
 578  */
 579 void
 580 dasd_delete_device(struct dasd_device *device)
 581 {
 582         struct ccw_device *cdev;
 583         struct dasd_devmap *devmap;
 584         unsigned long flags;
 585
 586         /* First remove device pointer from devmap. */
 587         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 588         BUG_ON(IS_ERR(devmap));
 589         spin_lock(&dasd_devmap_lock);
 590         if (devmap->device != device) {
 591                 spin_unlock(&dasd_devmap_lock);
 592                 dasd_put_device(device);
 593                 return;
 594         }
 595         devmap->device = NULL;
 596         spin_unlock(&dasd_devmap_lock);
 597
 598         /* Disconnect dasd_device structure from ccw_device structure. */
 599         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 600         device->cdev->dev.driver_data = NULL;
 601         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 602
 603         /*
 604          * Drop ref_count by 3, one for the devmap reference, one for
 605          * the cdev reference and one for the passed reference.
 606          */
 607         atomic_sub(3, &device->ref_count);
 608
 609         /* Wait for reference counter to drop to zero. */
 610         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 611
 612         /* Disconnect dasd_device structure from ccw_device structure. */
 613         cdev = device->cdev;
 614         device->cdev = NULL;
 615
 616         /* Put ccw_device structure. */
 617         put_device(&cdev->dev);
 618
 619         /* Now the device structure can be freed. */
 620         dasd_free_device(device);
 621 }
 622
 623 /*
 624  * Reference counter dropped to zero. Wake up waiter
 625  * in dasd_delete_device.
 626  */
 627 void
 628 dasd_put_device_wake(struct dasd_device *device)
 629 {
 630         wake_up(&dasd_delete_wq);
 631 }
 632
 633 /*
 634  * Return dasd_device structure associated with cdev.
 635  * This function needs to be called with the ccw device
 636  * lock held. It can be used from interrupt context.
 637  */
 638 struct dasd_device *
 639 dasd_device_from_cdev_locked(struct ccw_device *cdev)
 640 {
 641         struct dasd_device *device = cdev->dev.driver_data;
 642
 643         if (!device)
 644                 return ERR_PTR(-ENODEV);
 645         dasd_get_device(device);
 646         return device;
 647 }
 648
 649 /*
 650  * Return dasd_device structure associated with cdev.
 651  */
 652 struct dasd_device *
 653 dasd_device_from_cdev(struct ccw_device *cdev)
 654 {
 655         struct dasd_device *device;
 656         unsigned long flags;
 657
 658         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 659         device = dasd_device_from_cdev_locked(cdev);
 660         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 661         return device;
 662 }
 663
 664 /*
 665  * SECTION: files in sysfs
 666  */
 667
 668 /*
 669  * readonly controls the readonly status of a dasd
 670  */
 671 static ssize_t
 672 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 673 {
 674         struct dasd_devmap *devmap;
 675         int ro_flag;
 676
 677         devmap = dasd_find_busid(dev_name(dev));
 678         if (!IS_ERR(devmap))
 679                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
 680         else
 681                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
 682         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 683 }
 684
 685 static ssize_t
 686 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 687               const char *buf, size_t count)
 688 {
 689         struct dasd_devmap *devmap;
 690         int val;
 691         char *endp;
 692
 693         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 694         if (IS_ERR(devmap))
 695                 return PTR_ERR(devmap);
 696
 697         val = simple_strtoul(buf, &endp, 0);
 698         if (((endp + 1) < (buf + count)) || (val > 1))
 699                 return -EINVAL;
 700
 701         spin_lock(&dasd_devmap_lock);
 702         if (val)
 703                 devmap->features |= DASD_FEATURE_READONLY;
 704         else
 705                 devmap->features &= ~DASD_FEATURE_READONLY;
 706         if (devmap->device)
 707                 devmap->device->features = devmap->features;
 708         if (devmap->device && devmap->device->block
 709             && devmap->device->block->gdp)
 710                 set_disk_ro(devmap->device->block->gdp, val);
 711         spin_unlock(&dasd_devmap_lock);
 712         return count;
 713 }
 714
 715 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 716 /*
 717  * erplog controls the logging of ERP related data
 718  * (e.g. failing channel programs).
 719  */
 720 static ssize_t
 721 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 722 {
 723         struct dasd_devmap *devmap;
 724         int erplog;
 725
 726         devmap = dasd_find_busid(dev_name(dev));
 727         if (!IS_ERR(devmap))
 728                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 729         else
 730                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 731         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 732 }
 733
 734 static ssize_t
 735 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 736               const char *buf, size_t count)
 737 {
 738         struct dasd_devmap *devmap;
 739         int val;
 740         char *endp;
 741
 742         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 743         if (IS_ERR(devmap))
 744                 return PTR_ERR(devmap);
 745
 746         val = simple_strtoul(buf, &endp, 0);
 747         if (((endp + 1) < (buf + count)) || (val > 1))
 748                 return -EINVAL;
 749
 750         spin_lock(&dasd_devmap_lock);
 751         if (val)
 752                 devmap->features |= DASD_FEATURE_ERPLOG;
 753         else
 754                 devmap->features &= ~DASD_FEATURE_ERPLOG;
 755         if (devmap->device)
 756                 devmap->device->features = devmap->features;
 757         spin_unlock(&dasd_devmap_lock);
 758         return count;
 759 }
 760
 761 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 762
 763 /*
 764  * use_diag controls whether the driver should use diag rather than ssch
 765  * to talk to the device
 766  */
 767 static ssize_t
 768 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 769 {
 770         struct dasd_devmap *devmap;
 771         int use_diag;
 772
 773         devmap = dasd_find_busid(dev_name(dev));
 774         if (!IS_ERR(devmap))
 775                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 776         else
 777                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 778         return sprintf(buf, use_diag ? "1\n" : "0\n");
 779 }
 780
 781 static ssize_t
 782 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 783                     const char *buf, size_t count)
 784 {
 785         struct dasd_devmap *devmap;
 786         ssize_t rc;
 787         int val;
 788         char *endp;
 789
 790         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 791         if (IS_ERR(devmap))
 792                 return PTR_ERR(devmap);
 793
 794         val = simple_strtoul(buf, &endp, 0);
 795         if (((endp + 1) < (buf + count)) || (val > 1))
 796                 return -EINVAL;
 797
 798         spin_lock(&dasd_devmap_lock);
 799         /* Changing diag discipline flag is only allowed in offline state. */
 800         rc = count;
 801         if (!devmap->device) {
 802                 if (val)
 803                         devmap->features |= DASD_FEATURE_USEDIAG;
 804                 else
 805                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 806         } else
 807                 rc = -EPERM;
 808         spin_unlock(&dasd_devmap_lock);
 809         return rc;
 810 }
 811
 812 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 813
 814 static ssize_t
 815 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
 816                      char *buf)
 817 {
 818         struct dasd_device *device;
 819         ssize_t len;
 820
 821         device = dasd_device_from_cdev(to_ccwdev(dev));
 822         if (!IS_ERR(device) && device->discipline) {
 823                 len = snprintf(buf, PAGE_SIZE, "%s\n",
 824                                device->discipline->name);
 825                 dasd_put_device(device);
 826         } else
 827                 len = snprintf(buf, PAGE_SIZE, "none\n");
 828         return len;
 829 }
 830
 831 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
 832
 833 static ssize_t
 834 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
 835                      char *buf)
 836 {
 837         struct dasd_device *device;
 838         ssize_t len;
 839
 840         device = dasd_device_from_cdev(to_ccwdev(dev));
 841         if (!IS_ERR(device)) {
 842                 switch (device->state) {
 843                 case DASD_STATE_NEW:
 844                         len = snprintf(buf, PAGE_SIZE, "new\n");
 845                         break;
 846                 case DASD_STATE_KNOWN:
 847                         len = snprintf(buf, PAGE_SIZE, "detected\n");
 848                         break;
 849                 case DASD_STATE_BASIC:
 850                         len = snprintf(buf, PAGE_SIZE, "basic\n");
 851                         break;
 852                 case DASD_STATE_UNFMT:
 853                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
 854                         break;
 855                 case DASD_STATE_READY:
 856                         len = snprintf(buf, PAGE_SIZE, "ready\n");
 857                         break;
 858                 case DASD_STATE_ONLINE:
 859                         len = snprintf(buf, PAGE_SIZE, "online\n");
 860                         break;
 861                 default:
 862                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
 863                         break;
 864                 }
 865                 dasd_put_device(device);
 866         } else
 867                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
 868         return len;
 869 }
 870
 871 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
 872
 873 static ssize_t
 874 dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf)
 875 {
 876         struct dasd_devmap *devmap;
 877         int alias;
 878
 879         devmap = dasd_find_busid(dev_name(dev));
 880         spin_lock(&dasd_devmap_lock);
 881         if (IS_ERR(devmap) || strlen(devmap->uid.vendor) == 0) {
 882                 spin_unlock(&dasd_devmap_lock);
 883                 return sprintf(buf, "0\n");
 884         }
 885         if (devmap->uid.type == UA_BASE_PAV_ALIAS ||
 886             devmap->uid.type == UA_HYPER_PAV_ALIAS)
 887                 alias = 1;
 888         else
 889                 alias = 0;
 890         spin_unlock(&dasd_devmap_lock);
 891         return sprintf(buf, alias ? "1\n" : "0\n");
 892 }
 893
 894 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
 895
 896 static ssize_t
 897 dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
 898 {
 899         struct dasd_devmap *devmap;
 900         char *vendor;
 901
 902         devmap = dasd_find_busid(dev_name(dev));
 903         spin_lock(&dasd_devmap_lock);
 904         if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0)
 905                 vendor = devmap->uid.vendor;
 906         else
 907                 vendor = "";
 908         spin_unlock(&dasd_devmap_lock);
 909
 910         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
 911 }
 912
 913 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
 914
 915 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
 916                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
 917                      /* vduit */ 32 + 1)
 918
 919 static ssize_t
 920 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
 921 {
 922         struct dasd_devmap *devmap;
 923         char uid_string[UID_STRLEN];
 924         char ua_string[3];
 925         struct dasd_uid *uid;
 926
 927         devmap = dasd_find_busid(dev_name(dev));
 928         spin_lock(&dasd_devmap_lock);
 929         if (IS_ERR(devmap) || strlen(devmap->uid.vendor) == 0) {
 930                 spin_unlock(&dasd_devmap_lock);
 931                 return sprintf(buf, "\n");
 932         }
 933         uid = &devmap->uid;
 934         switch (uid->type) {
 935         case UA_BASE_DEVICE:
 936                 sprintf(ua_string, "%02x", uid->real_unit_addr);
 937                 break;
 938         case UA_BASE_PAV_ALIAS:
 939                 sprintf(ua_string, "%02x", uid->base_unit_addr);
 940                 break;
 941         case UA_HYPER_PAV_ALIAS:
 942                 sprintf(ua_string, "xx");
 943                 break;
 944         default:
 945                 /* should not happen, treat like base device */
 946                 sprintf(ua_string, "%02x", uid->real_unit_addr);
 947                 break;
 948         }
 949         if (strlen(uid->vduit) > 0)
 950                 snprintf(uid_string, sizeof(uid_string),
 951                          "%s.%s.%04x.%s.%s",
 952                          uid->vendor, uid->serial,
 953                          uid->ssid, ua_string,
 954                          uid->vduit);
 955         else
 956                 snprintf(uid_string, sizeof(uid_string),
 957                          "%s.%s.%04x.%s",
 958                          uid->vendor, uid->serial,
 959                          uid->ssid, ua_string);
 960         spin_unlock(&dasd_devmap_lock);
 961         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
 962 }
 963
 964 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
 965
 966 /*
 967  * extended error-reporting
 968  */
 969 static ssize_t
 970 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
 971 {
 972         struct dasd_devmap *devmap;
 973         int eer_flag;
 974
 975         devmap = dasd_find_busid(dev_name(dev));
 976         if (!IS_ERR(devmap) && devmap->device)
 977                 eer_flag = dasd_eer_enabled(devmap->device);
 978         else
 979                 eer_flag = 0;
 980         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
 981 }
 982
 983 static ssize_t
 984 dasd_eer_store(struct device *dev, struct device_attribute *attr,
 985                const char *buf, size_t count)
 986 {
 987         struct dasd_devmap *devmap;
 988         int val, rc;
 989         char *endp;
 990
 991         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 992         if (IS_ERR(devmap))
 993                 return PTR_ERR(devmap);
 994         if (!devmap->device)
 995                 return -ENODEV;
 996
 997         val = simple_strtoul(buf, &endp, 0);
 998         if (((endp + 1) < (buf + count)) || (val > 1))
 999                 return -EINVAL;
1000
1001         if (val) {
1002                 rc = dasd_eer_enable(devmap->device);
1003                 if (rc)
1004                         return rc;
1005         } else
1006                 dasd_eer_disable(devmap->device);
1007         return count;
1008 }
1009
1010 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1011
1012 static struct attribute * dasd_attrs[] = {
1013         &dev_attr_readonly.attr,
1014         &dev_attr_discipline.attr,
1015         &dev_attr_status.attr,
1016         &dev_attr_alias.attr,
1017         &dev_attr_vendor.attr,
1018         &dev_attr_uid.attr,
1019         &dev_attr_use_diag.attr,
1020         &dev_attr_eer_enabled.attr,
1021         &dev_attr_erplog.attr,
1022         NULL,
1023 };
1024
1025 static struct attribute_group dasd_attr_group = {
1026         .attrs = dasd_attrs,
1027 };
1028
1029 /*
1030  * Return copy of the device unique identifier.
1031  */
1032 int
1033 dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid)
1034 {
1035         struct dasd_devmap *devmap;
1036
1037         devmap = dasd_find_busid(dev_name(&cdev->dev));
1038         if (IS_ERR(devmap))
1039                 return PTR_ERR(devmap);
1040         spin_lock(&dasd_devmap_lock);
1041         *uid = devmap->uid;
1042         spin_unlock(&dasd_devmap_lock);
1043         return 0;
1044 }
1045
1046 /*
1047  * Register the given device unique identifier into devmap struct.
1048  * In addition check if the related storage server subsystem ID is already
1049  * contained in the dasd_server_ssid_list. If subsystem ID is not contained,
1050  * create new entry.
1051  * Return 0 if server was already in serverlist,
1052  *        1 if the server was added successful
1053  *       <0 in case of error.
1054  */
1055 int
1056 dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid)
1057 {
1058         struct dasd_devmap *devmap;
1059
1060         devmap = dasd_find_busid(dev_name(&cdev->dev));
1061         if (IS_ERR(devmap))
1062                 return PTR_ERR(devmap);
1063
1064         spin_lock(&dasd_devmap_lock);
1065         devmap->uid = *uid;
1066         spin_unlock(&dasd_devmap_lock);
1067
1068         return 0;
1069 }
1070 EXPORT_SYMBOL_GPL(dasd_set_uid);
1071
1072 /*
1073  * Return value of the specified feature.
1074  */
1075 int
1076 dasd_get_feature(struct ccw_device *cdev, int feature)
1077 {
1078         struct dasd_devmap *devmap;
1079
1080         devmap = dasd_find_busid(dev_name(&cdev->dev));
1081         if (IS_ERR(devmap))
1082                 return PTR_ERR(devmap);
1083
1084         return ((devmap->features & feature) != 0);
1085 }
1086
1087 /*
1088  * Set / reset given feature.
1089  * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1090  */
1091 int
1092 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1093 {
1094         struct dasd_devmap *devmap;
1095
1096         devmap = dasd_find_busid(dev_name(&cdev->dev));
1097         if (IS_ERR(devmap))
1098                 return PTR_ERR(devmap);
1099
1100         spin_lock(&dasd_devmap_lock);
1101         if (flag)
1102                 devmap->features |= feature;
1103         else
1104                 devmap->features &= ~feature;
1105         if (devmap->device)
1106                 devmap->device->features = devmap->features;
1107         spin_unlock(&dasd_devmap_lock);
1108         return 0;
1109 }
1110
1111
1112 int
1113 dasd_add_sysfs_files(struct ccw_device *cdev)
1114 {
1115         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1116 }
1117
1118 void
1119 dasd_remove_sysfs_files(struct ccw_device *cdev)
1120 {
1121         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1122 }
1123
1124
1125 int
1126 dasd_devmap_init(void)
1127 {
1128         int i;
1129
1130         /* Initialize devmap structures. */
1131         dasd_max_devindex = 0;
1132         for (i = 0; i < 256; i++)
1133                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1134         return 0;
1135 }
1136
1137 void
1138 dasd_devmap_exit(void)
1139 {
1140         dasd_forget_ranges();
1141 }