drivers/s390/block/dasd_devmap.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   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  * Copyright IBM Corp. 1999,2001
   9  *
  10  * Device mapping and dasd= parameter parsing functions. All devmap
  11  * functions may not be called from interrupt context. In particular
  12  * dasd_get_device is a no-no from interrupt context.
  13  *
  14  */
  15
  16 #define KMSG_COMPONENT "dasd"
  17
  18 #include <linux/ctype.h>
  19 #include <linux/init.h>
  20 #include <linux/module.h>
  21 #include <linux/slab.h>
  22
  23 #include <asm/debug.h>
  24 #include <linux/uaccess.h>
  25 #include <asm/ipl.h>
  26
  27 /* This is ugly... */
  28 #define PRINTK_HEADER "dasd_devmap:"
  29 #define DASD_BUS_ID_SIZE 20
  30 #define DASD_MAX_PARAMS 256
  31
  32 #include "dasd_int.h"
  33
  34 struct kmem_cache *dasd_page_cache;
  35 EXPORT_SYMBOL_GPL(dasd_page_cache);
  36
  37 /*
  38  * dasd_devmap_t is used to store the features and the relation
  39  * between device number and device index. To find a dasd_devmap_t
  40  * that corresponds to a device number of a device index each
  41  * dasd_devmap_t is added to two linked lists, one to search by
  42  * the device number and one to search by the device index. As
  43  * soon as big minor numbers are available the device index list
  44  * can be removed since the device number will then be identical
  45  * to the device index.
  46  */
  47 struct dasd_devmap {
  48         struct list_head list;
  49         char bus_id[DASD_BUS_ID_SIZE];
  50         unsigned int devindex;
  51         unsigned short features;
  52         struct dasd_device *device;
  53 };
  54
  55 /*
  56  * Parameter parsing functions for dasd= parameter. The syntax is:
  57  *   <devno>            : (0x)?[0-9a-fA-F]+
  58  *   <busid>            : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+
  59  *   <feature>          : ro
  60  *   <feature_list>     : \(<feature>(:<feature>)*\)
  61  *   <devno-range>      : <devno>(-<devno>)?<feature_list>?
  62  *   <busid-range>      : <busid>(-<busid>)?<feature_list>?
  63  *   <devices>          : <devno-range>|<busid-range>
  64  *   <dasd_module>      : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod
  65  *
  66  *   <dasd>             : autodetect|probeonly|<devices>(,<devices>)*
  67  */
  68
  69 int dasd_probeonly =  0;        /* is true, when probeonly mode is active */
  70 int dasd_autodetect = 0;        /* is true, when autodetection is active */
  71 int dasd_nopav = 0;             /* is true, when PAV is disabled */
  72 EXPORT_SYMBOL_GPL(dasd_nopav);
  73 int dasd_nofcx;                 /* disable High Performance Ficon */
  74 EXPORT_SYMBOL_GPL(dasd_nofcx);
  75
  76 /*
  77  * char *dasd[] is intended to hold the ranges supplied by the dasd= statement
  78  * it is named 'dasd' to directly be filled by insmod with the comma separated
  79  * strings when running as a module.
  80  */
  81 static char *dasd[DASD_MAX_PARAMS];
  82 module_param_array(dasd, charp, NULL, S_IRUGO);
  83
  84 /*
  85  * Single spinlock to protect devmap and servermap structures and lists.
  86  */
  87 static DEFINE_SPINLOCK(dasd_devmap_lock);
  88
  89 /*
  90  * Hash lists for devmap structures.
  91  */
  92 static struct list_head dasd_hashlists[256];
  93 int dasd_max_devindex;
  94
  95 static struct dasd_devmap *dasd_add_busid(const char *, int);
  96
  97 static inline int
  98 dasd_hash_busid(const char *bus_id)
  99 {
 100         int hash, i;
 101
 102         hash = 0;
 103         for (i = 0; (i < DASD_BUS_ID_SIZE) && *bus_id; i++, bus_id++)
 104                 hash += *bus_id;
 105         return hash & 0xff;
 106 }
 107
 108 #ifndef MODULE
 109 static int __init dasd_call_setup(char *opt)
 110 {
 111         static int i __initdata;
 112         char *tmp;
 113
 114         while (i < DASD_MAX_PARAMS) {
 115                 tmp = strsep(&opt, ",");
 116                 if (!tmp)
 117                         break;
 118
 119                 dasd[i++] = tmp;
 120         }
 121
 122         return 1;
 123 }
 124
 125 __setup ("dasd=", dasd_call_setup);
 126 #endif  /* #ifndef MODULE */
 127
 128 #define DASD_IPLDEV     "ipldev"
 129
 130 /*
 131  * Read a device busid/devno from a string.
 132  */
 133 static int __init dasd_busid(char *str, int *id0, int *id1, int *devno)
 134 {
 135         unsigned int val;
 136         char *tok;
 137
 138         /* Interpret ipldev busid */
 139         if (strncmp(DASD_IPLDEV, str, strlen(DASD_IPLDEV)) == 0) {
 140                 if (ipl_info.type != IPL_TYPE_CCW) {
 141                         pr_err("The IPL device is not a CCW device\n");
 142                         return -EINVAL;
 143                 }
 144                 *id0 = 0;
 145                 *id1 = ipl_info.data.ccw.dev_id.ssid;
 146                 *devno = ipl_info.data.ccw.dev_id.devno;
 147
 148                 return 0;
 149         }
 150
 151         /* Old style 0xXXXX or XXXX */
 152         if (!kstrtouint(str, 16, &val)) {
 153                 *id0 = *id1 = 0;
 154                 if (val > 0xffff)
 155                         return -EINVAL;
 156                 *devno = val;
 157                 return 0;
 158         }
 159
 160         /* New style x.y.z busid */
 161         tok = strsep(&str, ".");
 162         if (kstrtouint(tok, 16, &val) || val > 0xff)
 163                 return -EINVAL;
 164         *id0 = val;
 165
 166         tok = strsep(&str, ".");
 167         if (kstrtouint(tok, 16, &val) || val > 0xff)
 168                 return -EINVAL;
 169         *id1 = val;
 170
 171         tok = strsep(&str, ".");
 172         if (kstrtouint(tok, 16, &val) || val > 0xffff)
 173                 return -EINVAL;
 174         *devno = val;
 175
 176         return 0;
 177 }
 178
 179 /*
 180  * Read colon separated list of dasd features.
 181  */
 182 static int __init dasd_feature_list(char *str)
 183 {
 184         int features, len, rc;
 185
 186         features = 0;
 187         rc = 0;
 188
 189         if (!str)
 190                 return DASD_FEATURE_DEFAULT;
 191
 192         while (1) {
 193                 for (len = 0;
 194                      str[len] && str[len] != ':' && str[len] != ')'; len++);
 195                 if (len == 2 && !strncmp(str, "ro", 2))
 196                         features |= DASD_FEATURE_READONLY;
 197                 else if (len == 4 && !strncmp(str, "diag", 4))
 198                         features |= DASD_FEATURE_USEDIAG;
 199                 else if (len == 3 && !strncmp(str, "raw", 3))
 200                         features |= DASD_FEATURE_USERAW;
 201                 else if (len == 6 && !strncmp(str, "erplog", 6))
 202                         features |= DASD_FEATURE_ERPLOG;
 203                 else if (len == 8 && !strncmp(str, "failfast", 8))
 204                         features |= DASD_FEATURE_FAILFAST;
 205                 else {
 206                         pr_warn("%*s is not a supported device option\n",
 207                                 len, str);
 208                         rc = -EINVAL;
 209                 }
 210                 str += len;
 211                 if (*str != ':')
 212                         break;
 213                 str++;
 214         }
 215
 216         return rc ? : features;
 217 }
 218
 219 /*
 220  * Try to match the first element on the comma separated parse string
 221  * with one of the known keywords. If a keyword is found, take the approprate
 222  * action and return a pointer to the residual string. If the first element
 223  * could not be matched to any keyword then return an error code.
 224  */
 225 static int __init dasd_parse_keyword(char *keyword)
 226 {
 227         int length = strlen(keyword);
 228
 229         if (strncmp("autodetect", keyword, length) == 0) {
 230                 dasd_autodetect = 1;
 231                 pr_info("The autodetection mode has been activated\n");
 232                 return 0;
 233         }
 234         if (strncmp("probeonly", keyword, length) == 0) {
 235                 dasd_probeonly = 1;
 236                 pr_info("The probeonly mode has been activated\n");
 237                 return 0;
 238         }
 239         if (strncmp("nopav", keyword, length) == 0) {
 240                 if (MACHINE_IS_VM)
 241                         pr_info("'nopav' is not supported on z/VM\n");
 242                 else {
 243                         dasd_nopav = 1;
 244                         pr_info("PAV support has be deactivated\n");
 245                 }
 246                 return 0;
 247         }
 248         if (strncmp("nofcx", keyword, length) == 0) {
 249                 dasd_nofcx = 1;
 250                 pr_info("High Performance FICON support has been "
 251                         "deactivated\n");
 252                 return 0;
 253         }
 254         if (strncmp("fixedbuffers", keyword, length) == 0) {
 255                 if (dasd_page_cache)
 256                         return 0;
 257                 dasd_page_cache =
 258                         kmem_cache_create("dasd_page_cache", PAGE_SIZE,
 259                                           PAGE_SIZE, SLAB_CACHE_DMA,
 260                                           NULL);
 261                 if (!dasd_page_cache)
 262                         DBF_EVENT(DBF_WARNING, "%s", "Failed to create slab, "
 263                                 "fixed buffer mode disabled.");
 264                 else
 265                         DBF_EVENT(DBF_INFO, "%s",
 266                                  "turning on fixed buffer mode");
 267                 return 0;
 268         }
 269
 270         return -EINVAL;
 271 }
 272
 273 /*
 274  * Split a string of a device range into its pieces and return the from, to, and
 275  * feature parts separately.
 276  * e.g.:
 277  * 0.0.1234-0.0.5678(ro:erplog) -> from: 0.0.1234 to: 0.0.5678 features: ro:erplog
 278  * 0.0.8765(raw) -> from: 0.0.8765 to: null features: raw
 279  * 0x4321 -> from: 0x4321 to: null features: null
 280  */
 281 static int __init dasd_evaluate_range_param(char *range, char **from_str,
 282                                             char **to_str, char **features_str)
 283 {
 284         int rc = 0;
 285
 286         /* Do we have a range or a single device? */
 287         if (strchr(range, '-')) {
 288                 *from_str = strsep(&range, "-");
 289                 *to_str = strsep(&range, "(");
 290                 *features_str = strsep(&range, ")");
 291         } else {
 292                 *from_str = strsep(&range, "(");
 293                 *features_str = strsep(&range, ")");
 294         }
 295
 296         if (*features_str && !range) {
 297                 pr_warn("A closing parenthesis ')' is missing in the dasd= parameter\n");
 298                 rc = -EINVAL;
 299         }
 300
 301         return rc;
 302 }
 303
 304 /*
 305  * Try to interprete the range string as a device number or a range of devices.
 306  * If the interpretation is successful, create the matching dasd_devmap entries.
 307  * If interpretation fails or in case of an error, return an error code.
 308  */
 309 static int __init dasd_parse_range(const char *range)
 310 {
 311         struct dasd_devmap *devmap;
 312         int from, from_id0, from_id1;
 313         int to, to_id0, to_id1;
 314         int features;
 315         char bus_id[DASD_BUS_ID_SIZE + 1];
 316         char *features_str = NULL;
 317         char *from_str = NULL;
 318         char *to_str = NULL;
 319         int rc = 0;
 320         char *tmp;
 321
 322         tmp = kstrdup(range, GFP_KERNEL);
 323         if (!tmp)
 324                 return -ENOMEM;
 325
 326         if (dasd_evaluate_range_param(tmp, &from_str, &to_str, &features_str)) {
 327                 rc = -EINVAL;
 328                 goto out;
 329         }
 330
 331         if (dasd_busid(from_str, &from_id0, &from_id1, &from)) {
 332                 rc = -EINVAL;
 333                 goto out;
 334         }
 335
 336         to = from;
 337         to_id0 = from_id0;
 338         to_id1 = from_id1;
 339         if (to_str) {
 340                 if (dasd_busid(to_str, &to_id0, &to_id1, &to)) {
 341                         rc = -EINVAL;
 342                         goto out;
 343                 }
 344                 if (from_id0 != to_id0 || from_id1 != to_id1 || from > to) {
 345                         pr_err("%s is not a valid device range\n", range);
 346                         rc = -EINVAL;
 347                         goto out;
 348                 }
 349         }
 350
 351         features = dasd_feature_list(features_str);
 352         if (features < 0) {
 353                 rc = -EINVAL;
 354                 goto out;
 355         }
 356         /* each device in dasd= parameter should be set initially online */
 357         features |= DASD_FEATURE_INITIAL_ONLINE;
 358         while (from <= to) {
 359                 sprintf(bus_id, "%01x.%01x.%04x", from_id0, from_id1, from++);
 360                 devmap = dasd_add_busid(bus_id, features);
 361                 if (IS_ERR(devmap)) {
 362                         rc = PTR_ERR(devmap);
 363                         goto out;
 364                 }
 365         }
 366
 367 out:
 368         kfree(tmp);
 369
 370         return rc;
 371 }
 372
 373 /*
 374  * Parse parameters stored in dasd[]
 375  * The 'dasd=...' parameter allows to specify a comma separated list of
 376  * keywords and device ranges. The parameters in that list will be stored as
 377  * separate elementes in dasd[].
 378  */
 379 int __init dasd_parse(void)
 380 {
 381         int rc, i;
 382         char *cur;
 383
 384         rc = 0;
 385         for (i = 0; i < DASD_MAX_PARAMS; i++) {
 386                 cur = dasd[i];
 387                 if (!cur)
 388                         break;
 389                 if (*cur == '\0')
 390                         continue;
 391
 392                 rc = dasd_parse_keyword(cur);
 393                 if (rc)
 394                         rc = dasd_parse_range(cur);
 395
 396                 if (rc)
 397                         break;
 398         }
 399
 400         return rc;
 401 }
 402
 403 /*
 404  * Add a devmap for the device specified by busid. It is possible that
 405  * the devmap already exists (dasd= parameter). The order of the devices
 406  * added through this function will define the kdevs for the individual
 407  * devices.
 408  */
 409 static struct dasd_devmap *
 410 dasd_add_busid(const char *bus_id, int features)
 411 {
 412         struct dasd_devmap *devmap, *new, *tmp;
 413         int hash;
 414
 415         new = kzalloc(sizeof(struct dasd_devmap), GFP_KERNEL);
 416         if (!new)
 417                 return ERR_PTR(-ENOMEM);
 418         spin_lock(&dasd_devmap_lock);
 419         devmap = NULL;
 420         hash = dasd_hash_busid(bus_id);
 421         list_for_each_entry(tmp, &dasd_hashlists[hash], list)
 422                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 423                         devmap = tmp;
 424                         break;
 425                 }
 426         if (!devmap) {
 427                 /* This bus_id is new. */
 428                 new->devindex = dasd_max_devindex++;
 429                 strlcpy(new->bus_id, bus_id, DASD_BUS_ID_SIZE);
 430                 new->features = features;
 431                 new->device = NULL;
 432                 list_add(&new->list, &dasd_hashlists[hash]);
 433                 devmap = new;
 434                 new = NULL;
 435         }
 436         spin_unlock(&dasd_devmap_lock);
 437         kfree(new);
 438         return devmap;
 439 }
 440
 441 /*
 442  * Find devmap for device with given bus_id.
 443  */
 444 static struct dasd_devmap *
 445 dasd_find_busid(const char *bus_id)
 446 {
 447         struct dasd_devmap *devmap, *tmp;
 448         int hash;
 449
 450         spin_lock(&dasd_devmap_lock);
 451         devmap = ERR_PTR(-ENODEV);
 452         hash = dasd_hash_busid(bus_id);
 453         list_for_each_entry(tmp, &dasd_hashlists[hash], list) {
 454                 if (strncmp(tmp->bus_id, bus_id, DASD_BUS_ID_SIZE) == 0) {
 455                         devmap = tmp;
 456                         break;
 457                 }
 458         }
 459         spin_unlock(&dasd_devmap_lock);
 460         return devmap;
 461 }
 462
 463 /*
 464  * Check if busid has been added to the list of dasd ranges.
 465  */
 466 int
 467 dasd_busid_known(const char *bus_id)
 468 {
 469         return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0;
 470 }
 471
 472 /*
 473  * Forget all about the device numbers added so far.
 474  * This may only be called at module unload or system shutdown.
 475  */
 476 static void
 477 dasd_forget_ranges(void)
 478 {
 479         struct dasd_devmap *devmap, *n;
 480         int i;
 481
 482         spin_lock(&dasd_devmap_lock);
 483         for (i = 0; i < 256; i++) {
 484                 list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) {
 485                         BUG_ON(devmap->device != NULL);
 486                         list_del(&devmap->list);
 487                         kfree(devmap);
 488                 }
 489         }
 490         spin_unlock(&dasd_devmap_lock);
 491 }
 492
 493 /*
 494  * Find the device struct by its device index.
 495  */
 496 struct dasd_device *
 497 dasd_device_from_devindex(int devindex)
 498 {
 499         struct dasd_devmap *devmap, *tmp;
 500         struct dasd_device *device;
 501         int i;
 502
 503         spin_lock(&dasd_devmap_lock);
 504         devmap = NULL;
 505         for (i = 0; (i < 256) && !devmap; i++)
 506                 list_for_each_entry(tmp, &dasd_hashlists[i], list)
 507                         if (tmp->devindex == devindex) {
 508                                 /* Found the devmap for the device. */
 509                                 devmap = tmp;
 510                                 break;
 511                         }
 512         if (devmap && devmap->device) {
 513                 device = devmap->device;
 514                 dasd_get_device(device);
 515         } else
 516                 device = ERR_PTR(-ENODEV);
 517         spin_unlock(&dasd_devmap_lock);
 518         return device;
 519 }
 520
 521 /*
 522  * Return devmap for cdev. If no devmap exists yet, create one and
 523  * connect it to the cdev.
 524  */
 525 static struct dasd_devmap *
 526 dasd_devmap_from_cdev(struct ccw_device *cdev)
 527 {
 528         struct dasd_devmap *devmap;
 529
 530         devmap = dasd_find_busid(dev_name(&cdev->dev));
 531         if (IS_ERR(devmap))
 532                 devmap = dasd_add_busid(dev_name(&cdev->dev),
 533                                         DASD_FEATURE_DEFAULT);
 534         return devmap;
 535 }
 536
 537 /*
 538  * Create a dasd device structure for cdev.
 539  */
 540 struct dasd_device *
 541 dasd_create_device(struct ccw_device *cdev)
 542 {
 543         struct dasd_devmap *devmap;
 544         struct dasd_device *device;
 545         unsigned long flags;
 546         int rc;
 547
 548         devmap = dasd_devmap_from_cdev(cdev);
 549         if (IS_ERR(devmap))
 550                 return (void *) devmap;
 551
 552         device = dasd_alloc_device();
 553         if (IS_ERR(device))
 554                 return device;
 555         atomic_set(&device->ref_count, 3);
 556
 557         spin_lock(&dasd_devmap_lock);
 558         if (!devmap->device) {
 559                 devmap->device = device;
 560                 device->devindex = devmap->devindex;
 561                 device->features = devmap->features;
 562                 get_device(&cdev->dev);
 563                 device->cdev = cdev;
 564                 rc = 0;
 565         } else
 566                 /* Someone else was faster. */
 567                 rc = -EBUSY;
 568         spin_unlock(&dasd_devmap_lock);
 569
 570         if (rc) {
 571                 dasd_free_device(device);
 572                 return ERR_PTR(rc);
 573         }
 574
 575         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 576         dev_set_drvdata(&cdev->dev, device);
 577         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 578
 579         return device;
 580 }
 581
 582 /*
 583  * Wait queue for dasd_delete_device waits.
 584  */
 585 static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq);
 586
 587 /*
 588  * Remove a dasd device structure. The passed referenced
 589  * is destroyed.
 590  */
 591 void
 592 dasd_delete_device(struct dasd_device *device)
 593 {
 594         struct ccw_device *cdev;
 595         struct dasd_devmap *devmap;
 596         unsigned long flags;
 597
 598         /* First remove device pointer from devmap. */
 599         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 600         BUG_ON(IS_ERR(devmap));
 601         spin_lock(&dasd_devmap_lock);
 602         if (devmap->device != device) {
 603                 spin_unlock(&dasd_devmap_lock);
 604                 dasd_put_device(device);
 605                 return;
 606         }
 607         devmap->device = NULL;
 608         spin_unlock(&dasd_devmap_lock);
 609
 610         /* Disconnect dasd_device structure from ccw_device structure. */
 611         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 612         dev_set_drvdata(&device->cdev->dev, NULL);
 613         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 614
 615         /*
 616          * Drop ref_count by 3, one for the devmap reference, one for
 617          * the cdev reference and one for the passed reference.
 618          */
 619         atomic_sub(3, &device->ref_count);
 620
 621         /* Wait for reference counter to drop to zero. */
 622         wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0);
 623
 624         dasd_generic_free_discipline(device);
 625         /* Disconnect dasd_device structure from ccw_device structure. */
 626         cdev = device->cdev;
 627         device->cdev = NULL;
 628
 629         /* Put ccw_device structure. */
 630         put_device(&cdev->dev);
 631
 632         /* Now the device structure can be freed. */
 633         dasd_free_device(device);
 634 }
 635
 636 /*
 637  * Reference counter dropped to zero. Wake up waiter
 638  * in dasd_delete_device.
 639  */
 640 void
 641 dasd_put_device_wake(struct dasd_device *device)
 642 {
 643         wake_up(&dasd_delete_wq);
 644 }
 645 EXPORT_SYMBOL_GPL(dasd_put_device_wake);
 646
 647 /*
 648  * Return dasd_device structure associated with cdev.
 649  * This function needs to be called with the ccw device
 650  * lock held. It can be used from interrupt context.
 651  */
 652 struct dasd_device *
 653 dasd_device_from_cdev_locked(struct ccw_device *cdev)
 654 {
 655         struct dasd_device *device = dev_get_drvdata(&cdev->dev);
 656
 657         if (!device)
 658                 return ERR_PTR(-ENODEV);
 659         dasd_get_device(device);
 660         return device;
 661 }
 662
 663 /*
 664  * Return dasd_device structure associated with cdev.
 665  */
 666 struct dasd_device *
 667 dasd_device_from_cdev(struct ccw_device *cdev)
 668 {
 669         struct dasd_device *device;
 670         unsigned long flags;
 671
 672         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 673         device = dasd_device_from_cdev_locked(cdev);
 674         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 675         return device;
 676 }
 677
 678 void dasd_add_link_to_gendisk(struct gendisk *gdp, struct dasd_device *device)
 679 {
 680         struct dasd_devmap *devmap;
 681
 682         devmap = dasd_find_busid(dev_name(&device->cdev->dev));
 683         if (IS_ERR(devmap))
 684                 return;
 685         spin_lock(&dasd_devmap_lock);
 686         gdp->private_data = devmap;
 687         spin_unlock(&dasd_devmap_lock);
 688 }
 689
 690 struct dasd_device *dasd_device_from_gendisk(struct gendisk *gdp)
 691 {
 692         struct dasd_device *device;
 693         struct dasd_devmap *devmap;
 694
 695         if (!gdp->private_data)
 696                 return NULL;
 697         device = NULL;
 698         spin_lock(&dasd_devmap_lock);
 699         devmap = gdp->private_data;
 700         if (devmap && devmap->device) {
 701                 device = devmap->device;
 702                 dasd_get_device(device);
 703         }
 704         spin_unlock(&dasd_devmap_lock);
 705         return device;
 706 }
 707
 708 /*
 709  * SECTION: files in sysfs
 710  */
 711
 712 /*
 713  * failfast controls the behaviour, if no path is available
 714  */
 715 static ssize_t dasd_ff_show(struct device *dev, struct device_attribute *attr,
 716                             char *buf)
 717 {
 718         struct dasd_devmap *devmap;
 719         int ff_flag;
 720
 721         devmap = dasd_find_busid(dev_name(dev));
 722         if (!IS_ERR(devmap))
 723                 ff_flag = (devmap->features & DASD_FEATURE_FAILFAST) != 0;
 724         else
 725                 ff_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_FAILFAST) != 0;
 726         return snprintf(buf, PAGE_SIZE, ff_flag ? "1\n" : "0\n");
 727 }
 728
 729 static ssize_t dasd_ff_store(struct device *dev, struct device_attribute *attr,
 730               const char *buf, size_t count)
 731 {
 732         unsigned int val;
 733         int rc;
 734
 735         if (kstrtouint(buf, 0, &val) || val > 1)
 736                 return -EINVAL;
 737
 738         rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_FAILFAST, val);
 739
 740         return rc ? : count;
 741 }
 742
 743 static DEVICE_ATTR(failfast, 0644, dasd_ff_show, dasd_ff_store);
 744
 745 /*
 746  * readonly controls the readonly status of a dasd
 747  */
 748 static ssize_t
 749 dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf)
 750 {
 751         struct dasd_devmap *devmap;
 752         struct dasd_device *device;
 753         int ro_flag = 0;
 754
 755         devmap = dasd_find_busid(dev_name(dev));
 756         if (IS_ERR(devmap))
 757                 goto out;
 758
 759         ro_flag = !!(devmap->features & DASD_FEATURE_READONLY);
 760
 761         spin_lock(&dasd_devmap_lock);
 762         device = devmap->device;
 763         if (device)
 764                 ro_flag |= test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 765         spin_unlock(&dasd_devmap_lock);
 766
 767 out:
 768         return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n");
 769 }
 770
 771 static ssize_t
 772 dasd_ro_store(struct device *dev, struct device_attribute *attr,
 773               const char *buf, size_t count)
 774 {
 775         struct ccw_device *cdev = to_ccwdev(dev);
 776         struct dasd_device *device;
 777         unsigned long flags;
 778         unsigned int val;
 779         int rc;
 780
 781         if (kstrtouint(buf, 0, &val) || val > 1)
 782                 return -EINVAL;
 783
 784         rc = dasd_set_feature(cdev, DASD_FEATURE_READONLY, val);
 785         if (rc)
 786                 return rc;
 787
 788         device = dasd_device_from_cdev(cdev);
 789         if (IS_ERR(device))
 790                 return count;
 791
 792         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 793         val = val || test_bit(DASD_FLAG_DEVICE_RO, &device->flags);
 794
 795         if (!device->block || !device->block->gdp ||
 796             test_bit(DASD_FLAG_OFFLINE, &device->flags)) {
 797                 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 798                 goto out;
 799         }
 800         /* Increase open_count to avoid losing the block device */
 801         atomic_inc(&device->block->open_count);
 802         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 803
 804         set_disk_ro(device->block->gdp, val);
 805         atomic_dec(&device->block->open_count);
 806
 807 out:
 808         dasd_put_device(device);
 809
 810         return count;
 811 }
 812
 813 static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store);
 814 /*
 815  * erplog controls the logging of ERP related data
 816  * (e.g. failing channel programs).
 817  */
 818 static ssize_t
 819 dasd_erplog_show(struct device *dev, struct device_attribute *attr, char *buf)
 820 {
 821         struct dasd_devmap *devmap;
 822         int erplog;
 823
 824         devmap = dasd_find_busid(dev_name(dev));
 825         if (!IS_ERR(devmap))
 826                 erplog = (devmap->features & DASD_FEATURE_ERPLOG) != 0;
 827         else
 828                 erplog = (DASD_FEATURE_DEFAULT & DASD_FEATURE_ERPLOG) != 0;
 829         return snprintf(buf, PAGE_SIZE, erplog ? "1\n" : "0\n");
 830 }
 831
 832 static ssize_t
 833 dasd_erplog_store(struct device *dev, struct device_attribute *attr,
 834               const char *buf, size_t count)
 835 {
 836         unsigned int val;
 837         int rc;
 838
 839         if (kstrtouint(buf, 0, &val) || val > 1)
 840                 return -EINVAL;
 841
 842         rc = dasd_set_feature(to_ccwdev(dev), DASD_FEATURE_ERPLOG, val);
 843
 844         return rc ? : count;
 845 }
 846
 847 static DEVICE_ATTR(erplog, 0644, dasd_erplog_show, dasd_erplog_store);
 848
 849 /*
 850  * use_diag controls whether the driver should use diag rather than ssch
 851  * to talk to the device
 852  */
 853 static ssize_t
 854 dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf)
 855 {
 856         struct dasd_devmap *devmap;
 857         int use_diag;
 858
 859         devmap = dasd_find_busid(dev_name(dev));
 860         if (!IS_ERR(devmap))
 861                 use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0;
 862         else
 863                 use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0;
 864         return sprintf(buf, use_diag ? "1\n" : "0\n");
 865 }
 866
 867 static ssize_t
 868 dasd_use_diag_store(struct device *dev, struct device_attribute *attr,
 869                     const char *buf, size_t count)
 870 {
 871         struct dasd_devmap *devmap;
 872         unsigned int val;
 873         ssize_t rc;
 874
 875         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 876         if (IS_ERR(devmap))
 877                 return PTR_ERR(devmap);
 878
 879         if (kstrtouint(buf, 0, &val) || val > 1)
 880                 return -EINVAL;
 881
 882         spin_lock(&dasd_devmap_lock);
 883         /* Changing diag discipline flag is only allowed in offline state. */
 884         rc = count;
 885         if (!devmap->device && !(devmap->features & DASD_FEATURE_USERAW)) {
 886                 if (val)
 887                         devmap->features |= DASD_FEATURE_USEDIAG;
 888                 else
 889                         devmap->features &= ~DASD_FEATURE_USEDIAG;
 890         } else
 891                 rc = -EPERM;
 892         spin_unlock(&dasd_devmap_lock);
 893         return rc;
 894 }
 895
 896 static DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store);
 897
 898 /*
 899  * use_raw controls whether the driver should give access to raw eckd data or
 900  * operate in standard mode
 901  */
 902 static ssize_t
 903 dasd_use_raw_show(struct device *dev, struct device_attribute *attr, char *buf)
 904 {
 905         struct dasd_devmap *devmap;
 906         int use_raw;
 907
 908         devmap = dasd_find_busid(dev_name(dev));
 909         if (!IS_ERR(devmap))
 910                 use_raw = (devmap->features & DASD_FEATURE_USERAW) != 0;
 911         else
 912                 use_raw = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USERAW) != 0;
 913         return sprintf(buf, use_raw ? "1\n" : "0\n");
 914 }
 915
 916 static ssize_t
 917 dasd_use_raw_store(struct device *dev, struct device_attribute *attr,
 918                     const char *buf, size_t count)
 919 {
 920         struct dasd_devmap *devmap;
 921         ssize_t rc;
 922         unsigned long val;
 923
 924         devmap = dasd_devmap_from_cdev(to_ccwdev(dev));
 925         if (IS_ERR(devmap))
 926                 return PTR_ERR(devmap);
 927
 928         if ((kstrtoul(buf, 10, &val) != 0) || val > 1)
 929                 return -EINVAL;
 930
 931         spin_lock(&dasd_devmap_lock);
 932         /* Changing diag discipline flag is only allowed in offline state. */
 933         rc = count;
 934         if (!devmap->device && !(devmap->features & DASD_FEATURE_USEDIAG)) {
 935                 if (val)
 936                         devmap->features |= DASD_FEATURE_USERAW;
 937                 else
 938                         devmap->features &= ~DASD_FEATURE_USERAW;
 939         } else
 940                 rc = -EPERM;
 941         spin_unlock(&dasd_devmap_lock);
 942         return rc;
 943 }
 944
 945 static DEVICE_ATTR(raw_track_access, 0644, dasd_use_raw_show,
 946                    dasd_use_raw_store);
 947
 948 static ssize_t
 949 dasd_safe_offline_store(struct device *dev, struct device_attribute *attr,
 950                         const char *buf, size_t count)
 951 {
 952         struct ccw_device *cdev = to_ccwdev(dev);
 953         struct dasd_device *device;
 954         unsigned long flags;
 955         int rc;
 956
 957         spin_lock_irqsave(get_ccwdev_lock(cdev), flags);
 958         device = dasd_device_from_cdev_locked(cdev);
 959         if (IS_ERR(device)) {
 960                 rc = PTR_ERR(device);
 961                 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 962                 goto out;
 963         }
 964
 965         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
 966             test_bit(DASD_FLAG_SAFE_OFFLINE_RUNNING, &device->flags)) {
 967                 /* Already doing offline processing */
 968                 dasd_put_device(device);
 969                 spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 970                 rc = -EBUSY;
 971                 goto out;
 972         }
 973
 974         set_bit(DASD_FLAG_SAFE_OFFLINE, &device->flags);
 975         dasd_put_device(device);
 976         spin_unlock_irqrestore(get_ccwdev_lock(cdev), flags);
 977
 978         rc = ccw_device_set_offline(cdev);
 979
 980 out:
 981         return rc ? rc : count;
 982 }
 983
 984 static DEVICE_ATTR(safe_offline, 0200, NULL, dasd_safe_offline_store);
 985
 986 static ssize_t
 987 dasd_access_show(struct device *dev, struct device_attribute *attr,
 988                  char *buf)
 989 {
 990         struct ccw_device *cdev = to_ccwdev(dev);
 991         struct dasd_device *device;
 992         int count;
 993
 994         device = dasd_device_from_cdev(cdev);
 995         if (IS_ERR(device))
 996                 return PTR_ERR(device);
 997
 998         if (!device->discipline)
 999                 count = -ENODEV;
1000         else if (!device->discipline->host_access_count)
1001                 count = -EOPNOTSUPP;
1002         else
1003                 count = device->discipline->host_access_count(device);
1004
1005         dasd_put_device(device);
1006         if (count < 0)
1007                 return count;
1008
1009         return sprintf(buf, "%d\n", count);
1010 }
1011
1012 static DEVICE_ATTR(host_access_count, 0444, dasd_access_show, NULL);
1013
1014 static ssize_t
1015 dasd_discipline_show(struct device *dev, struct device_attribute *attr,
1016                      char *buf)
1017 {
1018         struct dasd_device *device;
1019         ssize_t len;
1020
1021         device = dasd_device_from_cdev(to_ccwdev(dev));
1022         if (IS_ERR(device))
1023                 goto out;
1024         else if (!device->discipline) {
1025                 dasd_put_device(device);
1026                 goto out;
1027         } else {
1028                 len = snprintf(buf, PAGE_SIZE, "%s\n",
1029                                device->discipline->name);
1030                 dasd_put_device(device);
1031                 return len;
1032         }
1033 out:
1034         len = snprintf(buf, PAGE_SIZE, "none\n");
1035         return len;
1036 }
1037
1038 static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL);
1039
1040 static ssize_t
1041 dasd_device_status_show(struct device *dev, struct device_attribute *attr,
1042                      char *buf)
1043 {
1044         struct dasd_device *device;
1045         ssize_t len;
1046
1047         device = dasd_device_from_cdev(to_ccwdev(dev));
1048         if (!IS_ERR(device)) {
1049                 switch (device->state) {
1050                 case DASD_STATE_NEW:
1051                         len = snprintf(buf, PAGE_SIZE, "new\n");
1052                         break;
1053                 case DASD_STATE_KNOWN:
1054                         len = snprintf(buf, PAGE_SIZE, "detected\n");
1055                         break;
1056                 case DASD_STATE_BASIC:
1057                         len = snprintf(buf, PAGE_SIZE, "basic\n");
1058                         break;
1059                 case DASD_STATE_UNFMT:
1060                         len = snprintf(buf, PAGE_SIZE, "unformatted\n");
1061                         break;
1062                 case DASD_STATE_READY:
1063                         len = snprintf(buf, PAGE_SIZE, "ready\n");
1064                         break;
1065                 case DASD_STATE_ONLINE:
1066                         len = snprintf(buf, PAGE_SIZE, "online\n");
1067                         break;
1068                 default:
1069                         len = snprintf(buf, PAGE_SIZE, "no stat\n");
1070                         break;
1071                 }
1072                 dasd_put_device(device);
1073         } else
1074                 len = snprintf(buf, PAGE_SIZE, "unknown\n");
1075         return len;
1076 }
1077
1078 static DEVICE_ATTR(status, 0444, dasd_device_status_show, NULL);
1079
1080 static ssize_t dasd_alias_show(struct device *dev,
1081                                struct device_attribute *attr, char *buf)
1082 {
1083         struct dasd_device *device;
1084         struct dasd_uid uid;
1085
1086         device = dasd_device_from_cdev(to_ccwdev(dev));
1087         if (IS_ERR(device))
1088                 return sprintf(buf, "0\n");
1089
1090         if (device->discipline && device->discipline->get_uid &&
1091             !device->discipline->get_uid(device, &uid)) {
1092                 if (uid.type == UA_BASE_PAV_ALIAS ||
1093                     uid.type == UA_HYPER_PAV_ALIAS) {
1094                         dasd_put_device(device);
1095                         return sprintf(buf, "1\n");
1096                 }
1097         }
1098         dasd_put_device(device);
1099
1100         return sprintf(buf, "0\n");
1101 }
1102
1103 static DEVICE_ATTR(alias, 0444, dasd_alias_show, NULL);
1104
1105 static ssize_t dasd_vendor_show(struct device *dev,
1106                                 struct device_attribute *attr, char *buf)
1107 {
1108         struct dasd_device *device;
1109         struct dasd_uid uid;
1110         char *vendor;
1111
1112         device = dasd_device_from_cdev(to_ccwdev(dev));
1113         vendor = "";
1114         if (IS_ERR(device))
1115                 return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1116
1117         if (device->discipline && device->discipline->get_uid &&
1118             !device->discipline->get_uid(device, &uid))
1119                         vendor = uid.vendor;
1120
1121         dasd_put_device(device);
1122
1123         return snprintf(buf, PAGE_SIZE, "%s\n", vendor);
1124 }
1125
1126 static DEVICE_ATTR(vendor, 0444, dasd_vendor_show, NULL);
1127
1128 #define UID_STRLEN ( /* vendor */ 3 + 1 + /* serial    */ 14 + 1 +\
1129                      /* SSID   */ 4 + 1 + /* unit addr */ 2 + 1 +\
1130                      /* vduit */ 32 + 1)
1131
1132 static ssize_t
1133 dasd_uid_show(struct device *dev, struct device_attribute *attr, char *buf)
1134 {
1135         struct dasd_device *device;
1136         struct dasd_uid uid;
1137         char uid_string[UID_STRLEN];
1138         char ua_string[3];
1139
1140         device = dasd_device_from_cdev(to_ccwdev(dev));
1141         uid_string[0] = 0;
1142         if (IS_ERR(device))
1143                 return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1144
1145         if (device->discipline && device->discipline->get_uid &&
1146             !device->discipline->get_uid(device, &uid)) {
1147                 switch (uid.type) {
1148                 case UA_BASE_DEVICE:
1149                         snprintf(ua_string, sizeof(ua_string), "%02x",
1150                                  uid.real_unit_addr);
1151                         break;
1152                 case UA_BASE_PAV_ALIAS:
1153                         snprintf(ua_string, sizeof(ua_string), "%02x",
1154                                  uid.base_unit_addr);
1155                         break;
1156                 case UA_HYPER_PAV_ALIAS:
1157                         snprintf(ua_string, sizeof(ua_string), "xx");
1158                         break;
1159                 default:
1160                         /* should not happen, treat like base device */
1161                         snprintf(ua_string, sizeof(ua_string), "%02x",
1162                                  uid.real_unit_addr);
1163                         break;
1164                 }
1165
1166                 if (strlen(uid.vduit) > 0)
1167                         snprintf(uid_string, sizeof(uid_string),
1168                                  "%s.%s.%04x.%s.%s",
1169                                  uid.vendor, uid.serial, uid.ssid, ua_string,
1170                                  uid.vduit);
1171                 else
1172                         snprintf(uid_string, sizeof(uid_string),
1173                                  "%s.%s.%04x.%s",
1174                                  uid.vendor, uid.serial, uid.ssid, ua_string);
1175         }
1176         dasd_put_device(device);
1177
1178         return snprintf(buf, PAGE_SIZE, "%s\n", uid_string);
1179 }
1180 static DEVICE_ATTR(uid, 0444, dasd_uid_show, NULL);
1181
1182 /*
1183  * extended error-reporting
1184  */
1185 static ssize_t
1186 dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf)
1187 {
1188         struct dasd_devmap *devmap;
1189         int eer_flag;
1190
1191         devmap = dasd_find_busid(dev_name(dev));
1192         if (!IS_ERR(devmap) && devmap->device)
1193                 eer_flag = dasd_eer_enabled(devmap->device);
1194         else
1195                 eer_flag = 0;
1196         return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n");
1197 }
1198
1199 static ssize_t
1200 dasd_eer_store(struct device *dev, struct device_attribute *attr,
1201                const char *buf, size_t count)
1202 {
1203         struct dasd_device *device;
1204         unsigned int val;
1205         int rc = 0;
1206
1207         device = dasd_device_from_cdev(to_ccwdev(dev));
1208         if (IS_ERR(device))
1209                 return PTR_ERR(device);
1210
1211         if (kstrtouint(buf, 0, &val) || val > 1)
1212                 return -EINVAL;
1213
1214         if (val)
1215                 rc = dasd_eer_enable(device);
1216         else
1217                 dasd_eer_disable(device);
1218
1219         dasd_put_device(device);
1220
1221         return rc ? : count;
1222 }
1223
1224 static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store);
1225
1226 /*
1227  * expiration time for default requests
1228  */
1229 static ssize_t
1230 dasd_expires_show(struct device *dev, struct device_attribute *attr, char *buf)
1231 {
1232         struct dasd_device *device;
1233         int len;
1234
1235         device = dasd_device_from_cdev(to_ccwdev(dev));
1236         if (IS_ERR(device))
1237                 return -ENODEV;
1238         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_expires);
1239         dasd_put_device(device);
1240         return len;
1241 }
1242
1243 static ssize_t
1244 dasd_expires_store(struct device *dev, struct device_attribute *attr,
1245                const char *buf, size_t count)
1246 {
1247         struct dasd_device *device;
1248         unsigned long val;
1249
1250         device = dasd_device_from_cdev(to_ccwdev(dev));
1251         if (IS_ERR(device))
1252                 return -ENODEV;
1253
1254         if ((kstrtoul(buf, 10, &val) != 0) ||
1255             (val > DASD_EXPIRES_MAX) || val == 0) {
1256                 dasd_put_device(device);
1257                 return -EINVAL;
1258         }
1259
1260         if (val)
1261                 device->default_expires = val;
1262
1263         dasd_put_device(device);
1264         return count;
1265 }
1266
1267 static DEVICE_ATTR(expires, 0644, dasd_expires_show, dasd_expires_store);
1268
1269 static ssize_t
1270 dasd_retries_show(struct device *dev, struct device_attribute *attr, char *buf)
1271 {
1272         struct dasd_device *device;
1273         int len;
1274
1275         device = dasd_device_from_cdev(to_ccwdev(dev));
1276         if (IS_ERR(device))
1277                 return -ENODEV;
1278         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->default_retries);
1279         dasd_put_device(device);
1280         return len;
1281 }
1282
1283 static ssize_t
1284 dasd_retries_store(struct device *dev, struct device_attribute *attr,
1285                    const char *buf, size_t count)
1286 {
1287         struct dasd_device *device;
1288         unsigned long val;
1289
1290         device = dasd_device_from_cdev(to_ccwdev(dev));
1291         if (IS_ERR(device))
1292                 return -ENODEV;
1293
1294         if ((kstrtoul(buf, 10, &val) != 0) ||
1295             (val > DASD_RETRIES_MAX)) {
1296                 dasd_put_device(device);
1297                 return -EINVAL;
1298         }
1299
1300         if (val)
1301                 device->default_retries = val;
1302
1303         dasd_put_device(device);
1304         return count;
1305 }
1306
1307 static DEVICE_ATTR(retries, 0644, dasd_retries_show, dasd_retries_store);
1308
1309 static ssize_t
1310 dasd_timeout_show(struct device *dev, struct device_attribute *attr,
1311                   char *buf)
1312 {
1313         struct dasd_device *device;
1314         int len;
1315
1316         device = dasd_device_from_cdev(to_ccwdev(dev));
1317         if (IS_ERR(device))
1318                 return -ENODEV;
1319         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->blk_timeout);
1320         dasd_put_device(device);
1321         return len;
1322 }
1323
1324 static ssize_t
1325 dasd_timeout_store(struct device *dev, struct device_attribute *attr,
1326                    const char *buf, size_t count)
1327 {
1328         struct dasd_device *device;
1329         struct request_queue *q;
1330         unsigned long val;
1331
1332         device = dasd_device_from_cdev(to_ccwdev(dev));
1333         if (IS_ERR(device) || !device->block)
1334                 return -ENODEV;
1335
1336         if ((kstrtoul(buf, 10, &val) != 0) ||
1337             val > UINT_MAX / HZ) {
1338                 dasd_put_device(device);
1339                 return -EINVAL;
1340         }
1341         q = device->block->request_queue;
1342         if (!q) {
1343                 dasd_put_device(device);
1344                 return -ENODEV;
1345         }
1346
1347         device->blk_timeout = val;
1348
1349         blk_queue_rq_timeout(q, device->blk_timeout * HZ);
1350
1351         dasd_put_device(device);
1352         return count;
1353 }
1354
1355 static DEVICE_ATTR(timeout, 0644,
1356                    dasd_timeout_show, dasd_timeout_store);
1357
1358
1359 static ssize_t
1360 dasd_path_reset_store(struct device *dev, struct device_attribute *attr,
1361                       const char *buf, size_t count)
1362 {
1363         struct dasd_device *device;
1364         unsigned int val;
1365
1366         device = dasd_device_from_cdev(to_ccwdev(dev));
1367         if (IS_ERR(device))
1368                 return -ENODEV;
1369
1370         if ((kstrtouint(buf, 16, &val) != 0) || val > 0xff)
1371                 val = 0;
1372
1373         if (device->discipline && device->discipline->reset_path)
1374                 device->discipline->reset_path(device, (__u8) val);
1375
1376         dasd_put_device(device);
1377         return count;
1378 }
1379
1380 static DEVICE_ATTR(path_reset, 0200, NULL, dasd_path_reset_store);
1381
1382 static ssize_t dasd_hpf_show(struct device *dev, struct device_attribute *attr,
1383                              char *buf)
1384 {
1385         struct dasd_device *device;
1386         int hpf;
1387
1388         device = dasd_device_from_cdev(to_ccwdev(dev));
1389         if (IS_ERR(device))
1390                 return -ENODEV;
1391         if (!device->discipline || !device->discipline->hpf_enabled) {
1392                 dasd_put_device(device);
1393                 return snprintf(buf, PAGE_SIZE, "%d\n", dasd_nofcx);
1394         }
1395         hpf = device->discipline->hpf_enabled(device);
1396         dasd_put_device(device);
1397         return snprintf(buf, PAGE_SIZE, "%d\n", hpf);
1398 }
1399
1400 static DEVICE_ATTR(hpf, 0444, dasd_hpf_show, NULL);
1401
1402 static ssize_t dasd_reservation_policy_show(struct device *dev,
1403                                             struct device_attribute *attr,
1404                                             char *buf)
1405 {
1406         struct dasd_devmap *devmap;
1407         int rc = 0;
1408
1409         devmap = dasd_find_busid(dev_name(dev));
1410         if (IS_ERR(devmap)) {
1411                 rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1412         } else {
1413                 spin_lock(&dasd_devmap_lock);
1414                 if (devmap->features & DASD_FEATURE_FAILONSLCK)
1415                         rc = snprintf(buf, PAGE_SIZE, "fail\n");
1416                 else
1417                         rc = snprintf(buf, PAGE_SIZE, "ignore\n");
1418                 spin_unlock(&dasd_devmap_lock);
1419         }
1420         return rc;
1421 }
1422
1423 static ssize_t dasd_reservation_policy_store(struct device *dev,
1424                                              struct device_attribute *attr,
1425                                              const char *buf, size_t count)
1426 {
1427         struct ccw_device *cdev = to_ccwdev(dev);
1428         int rc;
1429
1430         if (sysfs_streq("ignore", buf))
1431                 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 0);
1432         else if (sysfs_streq("fail", buf))
1433                 rc = dasd_set_feature(cdev, DASD_FEATURE_FAILONSLCK, 1);
1434         else
1435                 rc = -EINVAL;
1436
1437         return rc ? : count;
1438 }
1439
1440 static DEVICE_ATTR(reservation_policy, 0644,
1441                    dasd_reservation_policy_show, dasd_reservation_policy_store);
1442
1443 static ssize_t dasd_reservation_state_show(struct device *dev,
1444                                            struct device_attribute *attr,
1445                                            char *buf)
1446 {
1447         struct dasd_device *device;
1448         int rc = 0;
1449
1450         device = dasd_device_from_cdev(to_ccwdev(dev));
1451         if (IS_ERR(device))
1452                 return snprintf(buf, PAGE_SIZE, "none\n");
1453
1454         if (test_bit(DASD_FLAG_IS_RESERVED, &device->flags))
1455                 rc = snprintf(buf, PAGE_SIZE, "reserved\n");
1456         else if (test_bit(DASD_FLAG_LOCK_STOLEN, &device->flags))
1457                 rc = snprintf(buf, PAGE_SIZE, "lost\n");
1458         else
1459                 rc = snprintf(buf, PAGE_SIZE, "none\n");
1460         dasd_put_device(device);
1461         return rc;
1462 }
1463
1464 static ssize_t dasd_reservation_state_store(struct device *dev,
1465                                             struct device_attribute *attr,
1466                                             const char *buf, size_t count)
1467 {
1468         struct dasd_device *device;
1469         int rc = 0;
1470
1471         device = dasd_device_from_cdev(to_ccwdev(dev));
1472         if (IS_ERR(device))
1473                 return -ENODEV;
1474         if (sysfs_streq("reset", buf))
1475                 clear_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
1476         else
1477                 rc = -EINVAL;
1478         dasd_put_device(device);
1479
1480         if (rc)
1481                 return rc;
1482         else
1483                 return count;
1484 }
1485
1486 static DEVICE_ATTR(last_known_reservation_state, 0644,
1487                    dasd_reservation_state_show, dasd_reservation_state_store);
1488
1489 static ssize_t dasd_pm_show(struct device *dev,
1490                               struct device_attribute *attr, char *buf)
1491 {
1492         struct dasd_device *device;
1493         u8 opm, nppm, cablepm, cuirpm, hpfpm, ifccpm;
1494
1495         device = dasd_device_from_cdev(to_ccwdev(dev));
1496         if (IS_ERR(device))
1497                 return sprintf(buf, "0\n");
1498
1499         opm = dasd_path_get_opm(device);
1500         nppm = dasd_path_get_nppm(device);
1501         cablepm = dasd_path_get_cablepm(device);
1502         cuirpm = dasd_path_get_cuirpm(device);
1503         hpfpm = dasd_path_get_hpfpm(device);
1504         ifccpm = dasd_path_get_ifccpm(device);
1505         dasd_put_device(device);
1506
1507         return sprintf(buf, "%02x %02x %02x %02x %02x %02x\n", opm, nppm,
1508                        cablepm, cuirpm, hpfpm, ifccpm);
1509 }
1510
1511 static DEVICE_ATTR(path_masks, 0444, dasd_pm_show, NULL);
1512
1513 /*
1514  * threshold value for IFCC/CCC errors
1515  */
1516 static ssize_t
1517 dasd_path_threshold_show(struct device *dev,
1518                           struct device_attribute *attr, char *buf)
1519 {
1520         struct dasd_device *device;
1521         int len;
1522
1523         device = dasd_device_from_cdev(to_ccwdev(dev));
1524         if (IS_ERR(device))
1525                 return -ENODEV;
1526         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_thrhld);
1527         dasd_put_device(device);
1528         return len;
1529 }
1530
1531 static ssize_t
1532 dasd_path_threshold_store(struct device *dev, struct device_attribute *attr,
1533                            const char *buf, size_t count)
1534 {
1535         struct dasd_device *device;
1536         unsigned long flags;
1537         unsigned long val;
1538
1539         device = dasd_device_from_cdev(to_ccwdev(dev));
1540         if (IS_ERR(device))
1541                 return -ENODEV;
1542
1543         if (kstrtoul(buf, 10, &val) != 0 || val > DASD_THRHLD_MAX) {
1544                 dasd_put_device(device);
1545                 return -EINVAL;
1546         }
1547         spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1548         device->path_thrhld = val;
1549         spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1550         dasd_put_device(device);
1551         return count;
1552 }
1553 static DEVICE_ATTR(path_threshold, 0644, dasd_path_threshold_show,
1554                    dasd_path_threshold_store);
1555
1556 /*
1557  * configure if path is disabled after IFCC/CCC error threshold is
1558  * exceeded
1559  */
1560 static ssize_t
1561 dasd_path_autodisable_show(struct device *dev,
1562                                    struct device_attribute *attr, char *buf)
1563 {
1564         struct dasd_devmap *devmap;
1565         int flag;
1566
1567         devmap = dasd_find_busid(dev_name(dev));
1568         if (!IS_ERR(devmap))
1569                 flag = (devmap->features & DASD_FEATURE_PATH_AUTODISABLE) != 0;
1570         else
1571                 flag = (DASD_FEATURE_DEFAULT &
1572                         DASD_FEATURE_PATH_AUTODISABLE) != 0;
1573         return snprintf(buf, PAGE_SIZE, flag ? "1\n" : "0\n");
1574 }
1575
1576 static ssize_t
1577 dasd_path_autodisable_store(struct device *dev,
1578                                     struct device_attribute *attr,
1579                                     const char *buf, size_t count)
1580 {
1581         unsigned int val;
1582         int rc;
1583
1584         if (kstrtouint(buf, 0, &val) || val > 1)
1585                 return -EINVAL;
1586
1587         rc = dasd_set_feature(to_ccwdev(dev),
1588                               DASD_FEATURE_PATH_AUTODISABLE, val);
1589
1590         return rc ? : count;
1591 }
1592
1593 static DEVICE_ATTR(path_autodisable, 0644,
1594                    dasd_path_autodisable_show,
1595                    dasd_path_autodisable_store);
1596 /*
1597  * interval for IFCC/CCC checks
1598  * meaning time with no IFCC/CCC error before the error counter
1599  * gets reset
1600  */
1601 static ssize_t
1602 dasd_path_interval_show(struct device *dev,
1603                         struct device_attribute *attr, char *buf)
1604 {
1605         struct dasd_device *device;
1606         int len;
1607
1608         device = dasd_device_from_cdev(to_ccwdev(dev));
1609         if (IS_ERR(device))
1610                 return -ENODEV;
1611         len = snprintf(buf, PAGE_SIZE, "%lu\n", device->path_interval);
1612         dasd_put_device(device);
1613         return len;
1614 }
1615
1616 static ssize_t
1617 dasd_path_interval_store(struct device *dev, struct device_attribute *attr,
1618                const char *buf, size_t count)
1619 {
1620         struct dasd_device *device;
1621         unsigned long flags;
1622         unsigned long val;
1623
1624         device = dasd_device_from_cdev(to_ccwdev(dev));
1625         if (IS_ERR(device))
1626                 return -ENODEV;
1627
1628         if ((kstrtoul(buf, 10, &val) != 0) ||
1629             (val > DASD_INTERVAL_MAX) || val == 0) {
1630                 dasd_put_device(device);
1631                 return -EINVAL;
1632         }
1633         spin_lock_irqsave(get_ccwdev_lock(to_ccwdev(dev)), flags);
1634         if (val)
1635                 device->path_interval = val;
1636         spin_unlock_irqrestore(get_ccwdev_lock(to_ccwdev(dev)), flags);
1637         dasd_put_device(device);
1638         return count;
1639 }
1640
1641 static DEVICE_ATTR(path_interval, 0644, dasd_path_interval_show,
1642                    dasd_path_interval_store);
1643
1644
1645 static struct attribute * dasd_attrs[] = {
1646         &dev_attr_readonly.attr,
1647         &dev_attr_discipline.attr,
1648         &dev_attr_status.attr,
1649         &dev_attr_alias.attr,
1650         &dev_attr_vendor.attr,
1651         &dev_attr_uid.attr,
1652         &dev_attr_use_diag.attr,
1653         &dev_attr_raw_track_access.attr,
1654         &dev_attr_eer_enabled.attr,
1655         &dev_attr_erplog.attr,
1656         &dev_attr_failfast.attr,
1657         &dev_attr_expires.attr,
1658         &dev_attr_retries.attr,
1659         &dev_attr_timeout.attr,
1660         &dev_attr_reservation_policy.attr,
1661         &dev_attr_last_known_reservation_state.attr,
1662         &dev_attr_safe_offline.attr,
1663         &dev_attr_host_access_count.attr,
1664         &dev_attr_path_masks.attr,
1665         &dev_attr_path_threshold.attr,
1666         &dev_attr_path_autodisable.attr,
1667         &dev_attr_path_interval.attr,
1668         &dev_attr_path_reset.attr,
1669         &dev_attr_hpf.attr,
1670         NULL,
1671 };
1672
1673 static const struct attribute_group dasd_attr_group = {
1674         .attrs = dasd_attrs,
1675 };
1676
1677 /*
1678  * Return value of the specified feature.
1679  */
1680 int
1681 dasd_get_feature(struct ccw_device *cdev, int feature)
1682 {
1683         struct dasd_devmap *devmap;
1684
1685         devmap = dasd_find_busid(dev_name(&cdev->dev));
1686         if (IS_ERR(devmap))
1687                 return PTR_ERR(devmap);
1688
1689         return ((devmap->features & feature) != 0);
1690 }
1691
1692 /*
1693  * Set / reset given feature.
1694  * Flag indicates whether to set (!=0) or the reset (=0) the feature.
1695  */
1696 int
1697 dasd_set_feature(struct ccw_device *cdev, int feature, int flag)
1698 {
1699         struct dasd_devmap *devmap;
1700
1701         devmap = dasd_devmap_from_cdev(cdev);
1702         if (IS_ERR(devmap))
1703                 return PTR_ERR(devmap);
1704
1705         spin_lock(&dasd_devmap_lock);
1706         if (flag)
1707                 devmap->features |= feature;
1708         else
1709                 devmap->features &= ~feature;
1710         if (devmap->device)
1711                 devmap->device->features = devmap->features;
1712         spin_unlock(&dasd_devmap_lock);
1713         return 0;
1714 }
1715 EXPORT_SYMBOL(dasd_set_feature);
1716
1717
1718 int
1719 dasd_add_sysfs_files(struct ccw_device *cdev)
1720 {
1721         return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group);
1722 }
1723
1724 void
1725 dasd_remove_sysfs_files(struct ccw_device *cdev)
1726 {
1727         sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group);
1728 }
1729
1730
1731 int
1732 dasd_devmap_init(void)
1733 {
1734         int i;
1735
1736         /* Initialize devmap structures. */
1737         dasd_max_devindex = 0;
1738         for (i = 0; i < 256; i++)
1739                 INIT_LIST_HEAD(&dasd_hashlists[i]);
1740         return 0;
1741 }
1742
1743 void
1744 dasd_devmap_exit(void)
1745 {
1746         dasd_forget_ranges();
1747 }