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  * dasd_server_ssid_map contains a globally unique storage server subsystem ID.
  53  * dasd_server_ssid_list contains the list of all subsystem IDs accessed by
  54  * the DASD device driver.
  55  */
  56 struct dasd_server_ssid_map {
  57         struct list_head list;
  58         struct system_id {
  59                 char vendor[4];
  60                 char serial[15];
  61                 __u16 ssid;
  62         } sid;
  63 };
  64
  65 static struct list_head dasd_server_ssid_list;
  66
  67 /*
  68  * Parameter parsing functions for dasd= parameter. The syntax is:
  69  *   <devno>            : (0x)?[0-9a-fA-F]+
  70  *   <busid>            : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
  71  *   <feature>          : ro
  72  *   <feature_list>     : \(<feature>(:<feature>)*\)
  73  *   <devno-range>      : <devno>(-<devno>)?<feature_list>?
  74  *   <busid-range>      : <busid>(-<busid>)?<feature_list>?
  75  *   <devices>          : <devno-range>|<busid-range>
  76  *   <dasd_module>      : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
  77  *
  78  *   <dasd>             : autodetect|probeonly|<devices>(,<devices>)*
  79  */
  80
  81 int dasd_probeonly =  0;        /* is true, when probeonly mode is active */
  82 int dasd_autodetect = 0;        /* is true, when autodetection is active */
  83 int dasd_nopav = 0;             /* is true, when PAV is disabled */
  84 EXPORT_SYMBOL_GPL(dasd_nopav);
  85
  86 /*
  87  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
  88  * it is named 'dasd' to directly be filled by insmod with the comma separated
  89  * strings when running as a module.
  90  */
  91 static char *dasd[256];
  92 module_param_array(dasd, charp, NULL, 0);
  93
  94 /*
  95  * Single spinlock to protect devmap and servermap structures and lists.
  96  */
  97 static DEFINE_SPINLOCK(dasd_devmap_lock);
  98
  99 /*
 100  * Hash lists for devmap structures.
 101  */
 102 static struct list_head dasd_hashlists[256];
 103 int dasd_max_devindex;
 104
 105 static struct dasd_devmap *dasd_add_busid(char *, int);
 106
 107 static inline int
 108 dasd_hash_busid(char *bus_id)
 109 {
 110         int hash, i;
 111
 112         hash = 0;
 113         for (i = 0; (i < BUS_ID_SIZE) && *bus_id; i++, bus_id++)
 114                 hash += *bus_id;
 115         return hash & 0xff;
 116 }
 117
 118 #ifndef MODULE
 119 /*
 120  * The parameter parsing functions for builtin-drivers are called
 121  * before kmalloc works. Store the pointers to the parameters strings
 122  * into dasd[] for later processing.
 123  */
 124 static int __init
 125 dasd_call_setup(char *str)
 126 {
 127         static int count = 0;
 128
 129         if (count < 256)
 130                 dasd[count++] = str;
 131         return 1;
 132 }
 133
 134 __setup ("dasd=", dasd_call_setup);
 135 #endif  /* #ifndef MODULE */
 136
 137 #define DASD_IPLDEV     "ipldev"
 138
 139 /*
 140  * Read a device busid/devno from a string.
 141  */
 142 static int
 143 dasd_busid(char **str, int *id0, int *id1, int *devno)
 144 {
 145         int val, old_style;
 146
 147         /* Interpret ipldev busid */
 148         if (strncmp(DASD_IPLDEV, *str, strlen(DASD_IPLDEV)) == 0) {
 149                 if (ipl_info.type != IPL_TYPE_CCW) {
 150                         MESSAGE(KERN_ERR, "%s", "ipl device is not a ccw "
 151                                 "device");
 152                         return -EINVAL;
 153                 }
 154                 *id0 = 0;
 155                 *id1 = ipl_info.data.ccw.dev_id.ssid;
 156                 *devno = ipl_info.data.ccw.dev_id.devno;
 157                 *str += strlen(DASD_IPLDEV);
 158
 159                 return 0;
 160         }
 161         /* check for leading '0x' */
 162         old_style = 0;
 163         if ((*str)[0] == '0' && (*str)[1] == 'x') {
 164                 *str += 2;
 165                 old_style = 1;
 166         }
 167         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 168                 return -EINVAL;
 169         val = simple_strtoul(*str, str, 16);
 170         if (old_style || (*str)[0] != '.') {
 171                 *id0 = *id1 = 0;
 172                 if (val < 0 || val > 0xffff)
 173                         return -EINVAL;
 174                 *devno = val;
 175                 return 0;
 176         }
 177         /* New style x.y.z busid */
 178         if (val < 0 || val > 0xff)
 179                 return -EINVAL;
 180         *id0 = val;
 181         (*str)++;
 182         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 183                 return -EINVAL;
 184         val = simple_strtoul(*str, str, 16);
 185         if (val < 0 || val > 0xff || (*str)++[0] != '.')
 186                 return -EINVAL;
 187         *id1 = val;
 188         if (!isxdigit((*str)[0]))       /* We require at least one hex digit */
 189                 return -EINVAL;
 190         val = simple_strtoul(*str, str, 16);
 191         if (val < 0 || val > 0xffff)
 192                 return -EINVAL;
 193         *devno = val;
 194         return 0;
 195 }
 196
 197 /*
 198  * Read colon separated list of dasd features. Currently there is
 199  * only one: "ro" for read-only devices. The default feature set
 200  * is empty (value 0).
 201  */
 202 static int
 203 dasd_feature_list(char *str, char **endp)
 204 {
 205         int features, len, rc;
 206
 207         rc = 0;
 208         if (*str != '(') {
 209                 *endp = str;
 210                 return DASD_FEATURE_DEFAULT;
 211         }
 212         str++;
 213         features = 0;
 214
 215         while (1) {
 216                 for (len = 0;
 217                      str[len] && str[len] != ':' && str[len] != ')'; len++);
 218                 if (len == 2 && !strncmp(str, "ro", 2))
 219                         features |= DASD_FEATURE_READONLY;
 220                 else if (len == 4 && !strncmp(str, "diag", 4))
 221                         features |= DASD_FEATURE_USEDIAG;
 222                 else if (len == 6 && !strncmp(str, "erplog", 6))
 223                         features |= DASD_FEATURE_ERPLOG;
 224                 else {
 225                         MESSAGE(KERN_WARNING,
 226                                 "unsupported feature: %*s, "
 227                                 "ignoring setting", len, str);
 228                         rc = -EINVAL;
 229                 }
 230                 str += len;
 231                 if (*str != ':')
 232                         break;
 233                 str++;
 234         }
 235         if (*str != ')') {
 236                 MESSAGE(KERN_WARNING, "%s",
 237                         "missing ')' in dasd parameter string\n");
 238                 rc = -EINVAL;
 239         } else
 240                 str++;
 241         *endp = str;
 242         if (rc != 0)
 243                 return rc;
 244         return features;
 245 }
 246
 247 /*
 248  * Try to match the first element on the comma separated parse string
 249  * with one of the known keywords. If a keyword is found, take the approprate
 250  * action and return a pointer to the residual string. If the first element
 251  * could not be matched to any keyword then return an error code.
 252  */
 253 static char *
 254 dasd_parse_keyword( char *parsestring ) {
 255
 256         char *nextcomma, *residual_str;
 257         int length;
 258
 259         nextcomma = strchr(parsestring,',');
 260         if (nextcomma) {
 261                 length = nextcomma - parsestring;
 262                 residual_str = nextcomma + 1;
 263         } else {
 264                 length = strlen(parsestring);
 265                 residual_str = parsestring + length;
 266         }
 267         if (strncmp("autodetect", parsestring, length) == 0) {
 268                 dasd_autodetect = 1;
 269                 MESSAGE (KERN_INFO, "%s",
 270                          "turning to autodetection mode");
 271                 return residual_str;
 272         }
 273         if (strncmp("probeonly", parsestring, length) == 0) {
 274                 dasd_probeonly = 1;
 275                 MESSAGE(KERN_INFO, "%s",
 276                         "turning to probeonly mode");
 277                 return residual_str;
 278         }
 279         if (strncmp("nopav", parsestring, length) == 0) {
 280                 if (MACHINE_IS_VM)
 281                         MESSAGE(KERN_INFO, "%s", "'nopav' not supported on VM");
 282                 else {
 283                         dasd_nopav = 1;
 284                         MESSAGE(KERN_INFO, "%s", "disable PAV mode");
 285                 }
 286                 return residual_str;
 287         }
 288         if (strncmp("fixedbuffers", parsestring, length) == 0) {
 289                 if (dasd_page_cache)
 290                         return residual_str;
 291                 dasd_page_cache =
 292                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
 293                                           PAGE_SIZE, SLAB_CACHE_DMA,
 294                                           NULL);
 295                 if (!dasd_page_cache)
 296                         MESSAGE(KERN_WARNING, "%s", "Failed to create slab, "
 297                                 "fixed buffer mode disabled.");
 298                 else
 299                         MESSAGE (KERN_INFO, "%s",
 300                                  "turning on fixed buffer mode");
 301                 return residual_str;
 302         }
 303         return ERR_PTR(-EINVAL);
 304 }
 305
 306 /*
 307  * Try to interprete the first element on the comma separated parse string
 308  * as a device number or a range of devices. If the interpretation is
 309  * successfull, create the matching dasd_devmap entries and return a pointer
 310  * to the residual string.
 311  * If interpretation fails or in case of an error, return an error code.
 312  */
 313 static char *
 314 dasd_parse_range( char *parsestring ) {
 315
 316         struct dasd_devmap *devmap;
 317         int from, from_id0, from_id1;
 318         int to, to_id0, to_id1;
 319         int features, rc;
 320         char bus_id[BUS_ID_SIZE+1], *str;
 321
 322         str = parsestring;
 323         rc = dasd_busid(&str, &from_id0, &from_id1, &from);
 324         if (rc == 0) {
 325                 to = from;
 326                 to_id0 = from_id0;
 327                 to_id1 = from_id1;
 328                 if (*str == '-') {
 329                         str++;
 330                         rc = dasd_busid(&str, &to_id0, &to_id1, &to);
 331                 }
 332         }
 333         if (rc == 0 &&
 334             (from_id0 != to_id0 || from_id1 != to_id1 || from > to))
 335                 rc = -EINVAL;
 336         if (rc) {
 337                 MESSAGE(KERN_ERR, "Invalid device range %s", parsestring);
 338                 return ERR_PTR(rc);
 339         }
 340         features = dasd_feature_list(str, &str);
 341         if (features < 0)
 342                 return ERR_PTR(-EINVAL);
 343         /* each device in dasd= parameter should be set initially online */
 344         features |= DASD_FEATURE_INITIAL_ONLINE;
 345         while (from <= to) {
 346                 sprintf(bus_id, "%01x.%01x.%04x",
 347                         from_id0, from_id1, from++);
 348                 devmap = dasd_add_busid(bus_id, features);
 349                 if (IS_ERR(devmap))
 350                         return (char *)devmap;
 351         }
 352         if (*str == ',')
 353                 return str + 1;
 354         if (*str == '\0')
 355                 return str;
 356         MESSAGE(KERN_WARNING,
 357                 "junk at end of dasd parameter string: %s\n", str);
 358         return ERR_PTR(-EINVAL);
 359 }
 360
 361 static char *
 362 dasd_parse_next_element( char *parsestring ) {
 363         char * residual_str;
 364         residual_str = dasd_parse_keyword(parsestring);
 365         if (!IS_ERR(residual_str))
 366                 return residual_str;
 367         residual_str = dasd_parse_range(parsestring);
 368         return residual_str;
 369 }
 370
 371 /*
 372  * Parse parameters stored in dasd[]
 373  * The 'dasd=...' parameter allows to specify a comma separated list of
 374  * keywords and device ranges. When the dasd driver is build into the kernel,
 375  * the complete list will be stored as one element of the dasd[] array.
 376  * When the dasd driver is build as a module, then the list is broken into
 377  * it's elements and each dasd[] entry contains one element.
 378  */
 379 int
 380 dasd_parse(void)
 381 {
 382         int rc, i;
 383         char *parsestring;
 384
 385         rc = 0;
 386         for (i = 0; i < 256; i++) {
 387                 if (dasd[i] == NULL)
 388                         break;
 389                 parsestring = dasd[i];
 390                 /* loop over the comma separated list in the parsestring */
 391                 while (*parsestring) {
 392                         parsestring = dasd_parse_next_element(parsestring);
 393                         if(IS_ERR(parsestring)) {
 394                                 rc = PTR_ERR(parsestring);
 395                                 break;
 396                         }
 397                 }
 398                 if (rc) {
 399                         DBF_EVENT(DBF_ALERT, "%s", "invalid range found");
 400                         break;
 401                 }
 402         }
 403         return rc;
 404 }
 405
 406 /*
 407  * Add a devmap for the device specified by busid. It is possible that
 408  * the devmap already exists (dasd= parameter). The order of the devices
 409  * added through this function will define the kdevs for the individual
 410  * devices.
 411  */
 412 static struct dasd_devmap *
 413 dasd_add_busid(char *bus_id, int features)
 414 {
 415         struct dasd_devmap *devmap, *new, *tmp;
 416         int hash;
 417
 418         new = (struct dasd_devmap *)
 419                 kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
 420         if (!new)
 421                 return ERR_PTR(-ENOMEM);
 422         spin_lock(&dasd_devmap_lock);
 423         devmap = NULL;
 424         hash = dasd_hash_busid(bus_id);
 425         list_for_each_entry(tmp, &dasd_hashlists[hash], list)
 426                 if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) {
 427                         devmap = tmp;
 428                         break;
 429                 }
 430         if (!devmap) {
 431                 /* This bus_id is new. */
 432                 new->devindex = dasd_max_devindex++;
 433                 strncpy(new->bus_id, bus_id, BUS_ID_SIZE);
 434                 new->features = features;
 435                 new->device = NULL;
 436                 list_add(&new->list, &dasd_hashlists[hash]);
 437                 devmap = new;
 438                 new = NULL;
 439         }
 440         spin_unlock(&dasd_devmap_lock);
 441         kfree(new);
 442         return devmap;
 443 }
 444
 445 /*
 446  * Find devmap for device with given bus_id.
 447  */
 448 static struct dasd_devmap *
 449 dasd_find_busid(char *bus_id)
 450 {
 451         struct dasd_devmap *devmap, *tmp;
 452         int hash;
 453
 454         spin_lock(&dasd_devmap_lock);
 455         devmap = ERR_PTR(-ENODEV);
 456         hash = dasd_hash_busid(bus_id);
 457         list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
 458                 if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) {
 459                         devmap = tmp;
 460                         break;
 461                 }
 462         }
 463         spin_unlock(&dasd_devmap_lock);
 464         return devmap;
 465 }
 466
 467 /*
 468  * Check if busid has been added to the list of dasd ranges.
 469  */
 470 int
 471 dasd_busid_known(char *bus_id)
 472 {
 473         return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
 474 }
 475
 476 /*
 477  * Forget all about the device numbers added so far.
 478  * This may only be called at module unload or system shutdown.
 479  */
 480 static void
 481 dasd_forget_ranges(void)
 482 {
 483         struct dasd_devmap *devmap, *n;
 484         int i;
 485
 486         spin_lock(&dasd_devmap_lock);
 487         for (i = 0; i < 256; i++) {
 488                 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
 489                         BUG_ON(devmap->device != NULL);
 490                         list_del(&devmap->list);
 491                         kfree(devmap);
 492                 }
 493         }
 494         spin_unlock(&dasd_devmap_lock);
 495 }
 496
 497 /*
 498  * Find the device struct by its device index.
 499  */
 500 struct dasd_device *
 501 dasd_device_from_devindex(int devindex)
 502 {
 503         struct dasd_devmap *devmap, *tmp;
 504         struct dasd_device *device;
 505         int i;
 506
 507         spin_lock(&dasd_devmap_lock);
 508         devmap = NULL;
 509         for (i = 0; (i < 256) && !devmap; i++)
 510                 list_for_each_entry(tmp, &dasd_hashlists[i], list)
 511                         if (tmp->devindex == devindex) {
 512                                 /* Found the devmap for the device. */
 513                                 devmap = tmp;
 514                                 break;
 515                         }
 516         if (devmap && devmap->device) {
 517                 device = devmap->device;
 518                 dasd_get_device(device);
 519         } else
 520                 device = ERR_PTR(-ENODEV);
 521         spin_unlock(&dasd_devmap_lock);
 522         return device;
 523 }
 524
 525 /*
 526  * Return devmap for cdev. If no devmap exists yet, create one and
 527  * connect it to the cdev.
 528  */
 529 static struct dasd_devmap *
 530 dasd_devmap_from_cdev(struct ccw_device *cdev)
 531 {
 532         struct dasd_devmap *devmap;
 533
 534         devmap = dasd_find_busid(cdev->dev.bus_id);
 535         if (IS_ERR(devmap))
 536                 devmap = dasd_add_busid(cdev->dev.bus_id,
 537                                         DASD_FEATURE_DEFAULT);
 538         return devmap;
 539 }
 540
 541 /*
 542  * Create a dasd device structure for cdev.
 543  */
 544 struct dasd_device *
 545 dasd_create_device(struct ccw_device *cdev)
 546 {
 547         struct dasd_devmap *devmap;
 548         struct dasd_device *device;
 549         unsigned long flags;
 550         int rc;
 551
 552         devmap = dasd_devmap_from_cdev(cdev);
 553         if (IS_ERR(devmap))
 554                 return (void *) devmap;
 555
 556         device = dasd_alloc_device();
 557         if (IS_ERR(device))
 558                 return device;
 559         atomic_set(&device->ref_count, 3);
 560
 561         spin_lock(&dasd_devmap_lock);
 562         if (!devmap->device) {
 563                 devmap->device = device;
 564                 device->devindex = devmap->devindex;
 565                 device->features = devmap->features;
 566                 get_device(&cdev->dev);
 567                 device->cdev = cdev;
 568                 rc = 0;
 569         } else
 570                 /* Someone else was faster. */
 571                 rc = -EBUSY;
 572         spin_unlock(&dasd_devmap_lock);
 573
 574         if (rc) {
 575                 dasd_free_device(device);
 576                 return ERR_PTR(rc);
 577         }
 578
 579         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 580         cdev->dev.driver_data = device;
 581         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 582
 583         return device;
 584 }
 585
 586 /*
 587  * Wait queue for dasd_delete_device waits.
 588  */
 589 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
 590
 591 /*
 592  * Remove a dasd device structure. The passed referenced
 593  * is destroyed.
 594  */
 595 void
 596 dasd_delete_device(struct dasd_device *device)
 597 {
 598         struct ccw_device *cdev;
 599         struct dasd_devmap *devmap;
 600         unsigned long flags;
 601
 602         /* First remove device pointer from devmap. */
 603         devmap = dasd_find_busid(device->cdev->dev.bus_id);
 604         BUG_ON(IS_ERR(devmap));
 605         spin_lock(&dasd_devmap_lock);
 606         if (devmap->device != device) {
 607                 spin_unlock(&dasd_devmap_lock);
 608                 dasd_put_device(device);
 609                 return;
 610         }
 611         devmap->device = NULL;
 612         spin_unlock(&dasd_devmap_lock);
 613
 614         /* Disconnect dasd_device structure from ccw_device structure. */
 615         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 616         device->cdev->dev.driver_data = NULL;
 617         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 618
 619         /*
 620          * Drop ref_count by 3, one for the devmap reference, one for
 621          * the cdev reference and one for the passed reference.
 622          */
 623         atomic_sub(3, &device->ref_count);
 624
 625         /* Wait for reference counter to drop to zero. */
 626         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 627
 628         /* Disconnect dasd_device structure from ccw_device structure. */
 629         cdev = device->cdev;
 630         device->cdev = NULL;
 631
 632         /* Put ccw_device structure. */
 633         put_device(&cdev->dev);
 634
 635         /* Now the device structure can be freed. */
 636         dasd_free_device(device);
 637 }
 638
 639 /*
 640  * Reference counter dropped to zero. Wake up waiter
 641  * in dasd_delete_device.
 642  */
 643 void
 644 dasd_put_device_wake(struct dasd_device *device)
 645 {
 646         wake_up(&dasd_delete_wq);
 647 }
 648
 649 /*
 650  * Return dasd_device structure associated with cdev.
 651  * This function needs to be called with the ccw device
 652  * lock held. It can be used from interrupt context.
 653  */
 654 struct dasd_device *
 655 dasd_device_from_cdev_locked(struct ccw_device *cdev)
 656 {
 657         struct dasd_device *device = cdev->dev.driver_data;
 658
 659         if (!device)
 660                 return ERR_PTR(-ENODEV);
 661         dasd_get_device(device);
 662         return device;
 663 }
 664
 665 /*
 666  * Return dasd_device structure associated with cdev.
 667  */
 668 struct dasd_device *
 669 dasd_device_from_cdev(struct ccw_device *cdev)
 670 {
 671         struct dasd_device *device;
 672         unsigned long flags;
 673
 674         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 675         device = dasd_device_from_cdev_locked(cdev);
 676         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 677         return device;
 678 }
 679
 680 /*
 681  * SECTION: files in sysfs
 682  */
 683
 684 /*
 685  * readonly controls the readonly status of a dasd
 686  */
 687 static ssize_t
 688 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 689 {
 690         struct dasd_devmap *devmap;
 691         int ro_flag;
 692
 693         devmap = dasd_find_busid(dev->bus_id);
 694         if (!IS_ERR(devmap))
 695                 ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0;
 696         else
 697                 ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0;
 698         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 699 }
 700
 701 static ssize_t
 702 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 703               const char *buf, size_t count)
 704 {
 705         struct dasd_devmap *devmap;
 706         int val;
 707         char *endp;
 708
 709         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 710         if (IS_ERR(devmap))
 711                 return PTR_ERR(devmap);
 712
 713         val = simple_strtoul(buf, &endp, 0);
 714         if (((endp + 1) < (buf + count)) || (val > 1))
 715                 return -EINVAL;
 716
 717         spin_lock(&dasd_devmap_lock);
 718         if (val)
 719                 devmap->features |= DASD_FEATURE_READONLY;
 720         else
 721                 devmap->features &= ~DASD_FEATURE_READONLY;
 722         if (devmap->device)
 723                 devmap->device->features = devmap->features;
 724         if (devmap->device && devmap->device->gdp)
 725                 set_disk_ro(devmap->device->gdp, val);
 726         spin_unlock(&dasd_devmap_lock);
 727         return count;
 728 }
 729
 730 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 731 /*
 732  * erplog controls the logging of ERP related data
 733  * (e.g. failing channel programs).
 734  */
 735 static ssize_t
 736 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 737 {
 738         struct dasd_devmap *devmap;
 739         int erplog;
 740
 741         devmap = dasd_find_busid(dev->bus_id);
 742         if (!IS_ERR(devmap))
 743                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 744         else
 745                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 746         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 747 }
 748
 749 static ssize_t
 750 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 751               const char *buf, size_t count)
 752 {
 753         struct dasd_devmap *devmap;
 754         int val;
 755         char *endp;
 756
 757         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 758         if (IS_ERR(devmap))
 759                 return PTR_ERR(devmap);
 760
 761         val = simple_strtoul(buf, &endp, 0);
 762         if (((endp + 1) < (buf + count)) || (val > 1))
 763                 return -EINVAL;
 764
 765         spin_lock(&dasd_devmap_lock);
 766         if (val)
 767                 devmap->features |= DASD_FEATURE_ERPLOG;
 768         else
 769                 devmap->features &= ~DASD_FEATURE_ERPLOG;
 770         if (devmap->device)
 771                 devmap->device->features = devmap->features;
 772         spin_unlock(&dasd_devmap_lock);
 773         return count;
 774 }
 775
 776 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 777
 778 /*
 779  * use_diag controls whether the driver should use diag rather than ssch
 780  * to talk to the device
 781  */
 782 static ssize_t
 783 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 784 {
 785         struct dasd_devmap *devmap;
 786         int use_diag;
 787
 788         devmap = dasd_find_busid(dev->bus_id);
 789         if (!IS_ERR(devmap))
 790                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 791         else
 792                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 793         return sprintf(buf, use_diag ? "1\n" : "0\n");
 794 }
 795
 796 static ssize_t
 797 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 798                     const char *buf, size_t count)
 799 {
 800         struct dasd_devmap *devmap;
 801         ssize_t rc;
 802         int val;
 803         char *endp;
 804
 805         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 806         if (IS_ERR(devmap))
 807                 return PTR_ERR(devmap);
 808
 809         val = simple_strtoul(buf, &endp, 0);
 810         if (((endp + 1) < (buf + count)) || (val > 1))
 811                 return -EINVAL;
 812
 813         spin_lock(&dasd_devmap_lock);
 814         /* Changing diag discipline flag is only allowed in offline state. */
 815         rc = count;
 816         if (!devmap->device) {
 817                 if (val)
 818                         devmap->features |= DASD_FEATURE_USEDIAG;
 819                 else
 820                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 821         } else
 822                 rc = -EPERM;
 823         spin_unlock(&dasd_devmap_lock);
 824         return rc;
 825 }
 826
 827 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 828
 829 static ssize_t
 830 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
 831                      char *buf)
 832 {
 833         struct dasd_device *device;
 834         ssize_t len;
 835
 836         device = dasd_device_from_cdev(to_ccwdev(dev));
 837         if (!IS_ERR(device) && device->discipline) {
 838                 len = snprintf(buf, PAGE_SIZE, "%s\n",
 839                                device->discipline->name);
 840                 dasd_put_device(device);
 841         } else
 842                 len = snprintf(buf, PAGE_SIZE, "none\n");
 843         return len;
 844 }
 845
 846 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
 847
 848 static ssize_t
 849 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
 850                      char *buf)
 851 {
 852         struct dasd_device *device;
 853         ssize_t len;
 854
 855         device = dasd_device_from_cdev(to_ccwdev(dev));
 856         if (!IS_ERR(device)) {
 857                 switch (device->state) {
 858                 case DASD_STATE_NEW:
 859                         len = snprintf(buf, PAGE_SIZE, "new\n");
 860                         break;
 861                 case DASD_STATE_KNOWN:
 862                         len = snprintf(buf, PAGE_SIZE, "detected\n");
 863                         break;
 864                 case DASD_STATE_BASIC:
 865                         len = snprintf(buf, PAGE_SIZE, "basic\n");
 866                         break;
 867                 case DASD_STATE_UNFMT:
 868                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
 869                         break;
 870                 case DASD_STATE_READY:
 871                         len = snprintf(buf, PAGE_SIZE, "ready\n");
 872                         break;
 873                 case DASD_STATE_ONLINE:
 874                         len = snprintf(buf, PAGE_SIZE, "online\n");
 875                         break;
 876                 default:
 877                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
 878                         break;
 879                 }
 880                 dasd_put_device(device);
 881         } else
 882                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
 883         return len;
 884 }
 885
 886 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
 887
 888 static ssize_t
 889 dasd_alias_show(struct device *dev, struct device_attribute *attr, char *buf)
 890 {
 891         struct dasd_devmap *devmap;
 892         int alias;
 893
 894         devmap = dasd_find_busid(dev->bus_id);
 895         spin_lock(&dasd_devmap_lock);
 896         if (!IS_ERR(devmap))
 897                 alias = devmap->uid.alias;
 898         else
 899                 alias = 0;
 900         spin_unlock(&dasd_devmap_lock);
 901
 902         return sprintf(buf, alias ? "1\n" : "0\n");
 903 }
 904
 905 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
 906
 907 static ssize_t
 908 dasd_vendor_show(struct device *dev, struct device_attribute *attr, char *buf)
 909 {
 910         struct dasd_devmap *devmap;
 911         char *vendor;
 912
 913         devmap = dasd_find_busid(dev->bus_id);
 914         spin_lock(&dasd_devmap_lock);
 915         if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0)
 916                 vendor = devmap->uid.vendor;
 917         else
 918                 vendor = "";
 919         spin_unlock(&dasd_devmap_lock);
 920
 921         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
 922 }
 923
 924 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
 925
 926 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
 927                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1)
 928
 929 static ssize_t
 930 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
 931 {
 932         struct dasd_devmap *devmap;
 933         char uid[UID_STRLEN];
 934
 935         devmap = dasd_find_busid(dev->bus_id);
 936         spin_lock(&dasd_devmap_lock);
 937         if (!IS_ERR(devmap) && strlen(devmap->uid.vendor) > 0)
 938                 snprintf(uid, sizeof(uid), "%s.%s.%04x.%02x",
 939                          devmap->uid.vendor, devmap->uid.serial,
 940                          devmap->uid.ssid, devmap->uid.unit_addr);
 941         else
 942                 uid[0] = 0;
 943         spin_unlock(&dasd_devmap_lock);
 944
 945         return snprintf(buf, PAGE_SIZE, "%s\n", uid);
 946 }
 947
 948 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
 949
 950 /*
 951  * extended error-reporting
 952  */
 953 static ssize_t
 954 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
 955 {
 956         struct dasd_devmap *devmap;
 957         int eer_flag;
 958
 959         devmap = dasd_find_busid(dev->bus_id);
 960         if (!IS_ERR(devmap) && devmap->device)
 961                 eer_flag = dasd_eer_enabled(devmap->device);
 962         else
 963                 eer_flag = 0;
 964         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
 965 }
 966
 967 static ssize_t
 968 dasd_eer_store(struct device *dev, struct device_attribute *attr,
 969                const char *buf, size_t count)
 970 {
 971         struct dasd_devmap *devmap;
 972         int val, rc;
 973         char *endp;
 974
 975         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 976         if (IS_ERR(devmap))
 977                 return PTR_ERR(devmap);
 978         if (!devmap->device)
 979                 return -ENODEV;
 980
 981         val = simple_strtoul(buf, &endp, 0);
 982         if (((endp + 1) < (buf + count)) || (val > 1))
 983                 return -EINVAL;
 984
 985         if (val) {
 986                 rc = dasd_eer_enable(devmap->device);
 987                 if (rc)
 988                         return rc;
 989         } else
 990                 dasd_eer_disable(devmap->device);
 991         return count;
 992 }
 993
 994 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
 995
 996 static struct attribute * dasd_attrs[] = {
 997         &dev_attr_readonly.attr,
 998         &dev_attr_discipline.attr,
 999         &dev_attr_status.attr,
1000         &dev_attr_alias.attr,
1001         &dev_attr_vendor.attr,
1002         &dev_attr_uid.attr,
1003         &dev_attr_use_diag.attr,
1004         &dev_attr_eer_enabled.attr,
1005         &dev_attr_erplog.attr,
1006         NULL,
1007 };
1008
1009 static struct attribute_group dasd_attr_group = {
1010         .attrs = dasd_attrs,
1011 };
1012
1013 /*
1014  * Return copy of the device unique identifier.
1015  */
1016 int
1017 dasd_get_uid(struct ccw_device *cdev, struct dasd_uid *uid)
1018 {
1019         struct dasd_devmap *devmap;
1020
1021         devmap = dasd_find_busid(cdev->dev.bus_id);
1022         if (IS_ERR(devmap))
1023                 return PTR_ERR(devmap);
1024         spin_lock(&dasd_devmap_lock);
1025         *uid = devmap->uid;
1026         spin_unlock(&dasd_devmap_lock);
1027         return 0;
1028 }
1029
1030 /*
1031  * Register the given device unique identifier into devmap struct.
1032  * In addition check if the related storage server subsystem ID is already
1033  * contained in the dasd_server_ssid_list. If subsystem ID is not contained,
1034  * create new entry.
1035  * Return 0 if server was already in serverlist,
1036  *        1 if the server was added successful
1037  *       <0 in case of error.
1038  */
1039 int
1040 dasd_set_uid(struct ccw_device *cdev, struct dasd_uid *uid)
1041 {
1042         struct dasd_devmap *devmap;
1043         struct dasd_server_ssid_map *srv, *tmp;
1044
1045         devmap = dasd_find_busid(cdev->dev.bus_id);
1046         if (IS_ERR(devmap))
1047                 return PTR_ERR(devmap);
1048
1049         /* generate entry for server_ssid_map */
1050         srv = (struct dasd_server_ssid_map *)
1051                 kzalloc(sizeof(struct dasd_server_ssid_map), GFP_KERNEL);
1052         if (!srv)
1053                 return -ENOMEM;
1054         strncpy(srv->sid.vendor, uid->vendor, sizeof(srv->sid.vendor) - 1);
1055         strncpy(srv->sid.serial, uid->serial, sizeof(srv->sid.serial) - 1);
1056         srv->sid.ssid = uid->ssid;
1057
1058         /* server is already contained ? */
1059         spin_lock(&dasd_devmap_lock);
1060         devmap->uid = *uid;
1061         list_for_each_entry(tmp, &dasd_server_ssid_list, list) {
1062                 if (!memcmp(&srv->sid, &tmp->sid,
1063                             sizeof(struct system_id))) {
1064                         kfree(srv);
1065                         srv = NULL;
1066                         break;
1067                 }
1068         }
1069
1070         /* add servermap to serverlist */
1071         if (srv)
1072                 list_add(&srv->list, &dasd_server_ssid_list);
1073         spin_unlock(&dasd_devmap_lock);
1074
1075         return (srv ? 1 : 0);
1076 }
1077 EXPORT_SYMBOL_GPL(dasd_set_uid);
1078
1079 /*
1080  * Return value of the specified feature.
1081  */
1082 int
1083 dasd_get_feature(struct ccw_device *cdev, int feature)
1084 {
1085         struct dasd_devmap *devmap;
1086
1087         devmap = dasd_find_busid(cdev->dev.bus_id);
1088         if (IS_ERR(devmap))
1089                 return PTR_ERR(devmap);
1090
1091         return ((devmap->features & feature) != 0);
1092 }
1093
1094 /*
1095  * Set / reset given feature.
1096  * Flag indicates wether to set (!=0) or the reset (=0) the feature.
1097  */
1098 int
1099 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1100 {
1101         struct dasd_devmap *devmap;
1102
1103         devmap = dasd_find_busid(cdev->dev.bus_id);
1104         if (IS_ERR(devmap))
1105                 return PTR_ERR(devmap);
1106
1107         spin_lock(&dasd_devmap_lock);
1108         if (flag)
1109                 devmap->features |= feature;
1110         else
1111                 devmap->features &= ~feature;
1112         if (devmap->device)
1113                 devmap->device->features = devmap->features;
1114         spin_unlock(&dasd_devmap_lock);
1115         return 0;
1116 }
1117
1118
1119 int
1120 dasd_add_sysfs_files(struct ccw_device *cdev)
1121 {
1122         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1123 }
1124
1125 void
1126 dasd_remove_sysfs_files(struct ccw_device *cdev)
1127 {
1128         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1129 }
1130
1131
1132 int
1133 dasd_devmap_init(void)
1134 {
1135         int i;
1136
1137         /* Initialize devmap structures. */
1138         dasd_max_devindex = 0;
1139         for (i = 0; i < 256; i++)
1140                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1141
1142         /* Initialize servermap structure. */
1143         INIT_LIST_HEAD(&dasd_server_ssid_list);
1144         return 0;
1145 }
1146
1147 void
1148 dasd_devmap_exit(void)
1149 {
1150         dasd_forget_ranges();
1151 }