Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | #include <linux/config.h> |
| 17 | #include <linux/ctype.h> |
| 18 | #include <linux/init.h> |
Rusty Russell | 8d3b33f | 2006-03-25 03:07:05 -0800 | [diff] [blame] | 19 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
| 21 | #include <asm/debug.h> |
| 22 | #include <asm/uaccess.h> |
| 23 | |
| 24 | /* This is ugly... */ |
| 25 | #define PRINTK_HEADER "dasd_devmap:" |
| 26 | |
| 27 | #include "dasd_int.h" |
| 28 | |
| 29 | kmem_cache_t *dasd_page_cache; |
| 30 | EXPORT_SYMBOL(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 | }; |
| 49 | |
| 50 | /* |
| 51 | * Parameter parsing functions for dasd= parameter. The syntax is: |
| 52 | * <devno> : (0x)?[0-9a-fA-F]+ |
| 53 | * <busid> : [0-0a-f]\.[0-9a-f]\.(0x)?[0-9a-fA-F]+ |
| 54 | * <feature> : ro |
| 55 | * <feature_list> : \(<feature>(:<feature>)*\) |
| 56 | * <devno-range> : <devno>(-<devno>)?<feature_list>? |
| 57 | * <busid-range> : <busid>(-<busid>)?<feature_list>? |
| 58 | * <devices> : <devno-range>|<busid-range> |
| 59 | * <dasd_module> : dasd_diag_mod|dasd_eckd_mod|dasd_fba_mod |
| 60 | * |
| 61 | * <dasd> : autodetect|probeonly|<devices>(,<devices>)* |
| 62 | */ |
| 63 | |
| 64 | int dasd_probeonly = 0; /* is true, when probeonly mode is active */ |
| 65 | int dasd_autodetect = 0; /* is true, when autodetection is active */ |
| 66 | |
| 67 | /* |
| 68 | * char *dasd[] is intended to hold the ranges supplied by the dasd= statement |
| 69 | * it is named 'dasd' to directly be filled by insmod with the comma separated |
| 70 | * strings when running as a module. |
| 71 | */ |
| 72 | static char *dasd[256]; |
Rusty Russell | 8d3b33f | 2006-03-25 03:07:05 -0800 | [diff] [blame] | 73 | module_param_array(dasd, charp, NULL, 0); |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | /* |
| 76 | * Single spinlock to protect devmap structures and lists. |
| 77 | */ |
| 78 | static DEFINE_SPINLOCK(dasd_devmap_lock); |
| 79 | |
| 80 | /* |
| 81 | * Hash lists for devmap structures. |
| 82 | */ |
| 83 | static struct list_head dasd_hashlists[256]; |
| 84 | int dasd_max_devindex; |
| 85 | |
| 86 | static struct dasd_devmap *dasd_add_busid(char *, int); |
| 87 | |
| 88 | static inline int |
| 89 | dasd_hash_busid(char *bus_id) |
| 90 | { |
| 91 | int hash, i; |
| 92 | |
| 93 | hash = 0; |
| 94 | for (i = 0; (i < BUS_ID_SIZE) && *bus_id; i++, bus_id++) |
| 95 | hash += *bus_id; |
| 96 | return hash & 0xff; |
| 97 | } |
| 98 | |
| 99 | #ifndef MODULE |
| 100 | /* |
| 101 | * The parameter parsing functions for builtin-drivers are called |
| 102 | * before kmalloc works. Store the pointers to the parameters strings |
| 103 | * into dasd[] for later processing. |
| 104 | */ |
| 105 | static int __init |
| 106 | dasd_call_setup(char *str) |
| 107 | { |
| 108 | static int count = 0; |
| 109 | |
| 110 | if (count < 256) |
| 111 | dasd[count++] = str; |
| 112 | return 1; |
| 113 | } |
| 114 | |
| 115 | __setup ("dasd=", dasd_call_setup); |
| 116 | #endif /* #ifndef MODULE */ |
| 117 | |
| 118 | /* |
| 119 | * Read a device busid/devno from a string. |
| 120 | */ |
| 121 | static inline int |
| 122 | dasd_busid(char **str, int *id0, int *id1, int *devno) |
| 123 | { |
| 124 | int val, old_style; |
| 125 | |
| 126 | /* check for leading '0x' */ |
| 127 | old_style = 0; |
| 128 | if ((*str)[0] == '0' && (*str)[1] == 'x') { |
| 129 | *str += 2; |
| 130 | old_style = 1; |
| 131 | } |
| 132 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ |
| 133 | return -EINVAL; |
| 134 | val = simple_strtoul(*str, str, 16); |
| 135 | if (old_style || (*str)[0] != '.') { |
| 136 | *id0 = *id1 = 0; |
| 137 | if (val < 0 || val > 0xffff) |
| 138 | return -EINVAL; |
| 139 | *devno = val; |
| 140 | return 0; |
| 141 | } |
| 142 | /* New style x.y.z busid */ |
| 143 | if (val < 0 || val > 0xff) |
| 144 | return -EINVAL; |
| 145 | *id0 = val; |
| 146 | (*str)++; |
| 147 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ |
| 148 | return -EINVAL; |
| 149 | val = simple_strtoul(*str, str, 16); |
| 150 | if (val < 0 || val > 0xff || (*str)++[0] != '.') |
| 151 | return -EINVAL; |
| 152 | *id1 = val; |
| 153 | if (!isxdigit((*str)[0])) /* We require at least one hex digit */ |
| 154 | return -EINVAL; |
| 155 | val = simple_strtoul(*str, str, 16); |
| 156 | if (val < 0 || val > 0xffff) |
| 157 | return -EINVAL; |
| 158 | *devno = val; |
| 159 | return 0; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Read colon separated list of dasd features. Currently there is |
| 164 | * only one: "ro" for read-only devices. The default feature set |
| 165 | * is empty (value 0). |
| 166 | */ |
| 167 | static inline int |
| 168 | dasd_feature_list(char *str, char **endp) |
| 169 | { |
| 170 | int features, len, rc; |
| 171 | |
| 172 | rc = 0; |
| 173 | if (*str != '(') { |
| 174 | *endp = str; |
| 175 | return DASD_FEATURE_DEFAULT; |
| 176 | } |
| 177 | str++; |
| 178 | features = 0; |
| 179 | |
| 180 | while (1) { |
| 181 | for (len = 0; |
| 182 | str[len] && str[len] != ':' && str[len] != ')'; len++); |
| 183 | if (len == 2 && !strncmp(str, "ro", 2)) |
| 184 | features |= DASD_FEATURE_READONLY; |
| 185 | else if (len == 4 && !strncmp(str, "diag", 4)) |
| 186 | features |= DASD_FEATURE_USEDIAG; |
| 187 | else { |
| 188 | MESSAGE(KERN_WARNING, |
| 189 | "unsupported feature: %*s, " |
| 190 | "ignoring setting", len, str); |
| 191 | rc = -EINVAL; |
| 192 | } |
| 193 | str += len; |
| 194 | if (*str != ':') |
| 195 | break; |
| 196 | str++; |
| 197 | } |
| 198 | if (*str != ')') { |
| 199 | MESSAGE(KERN_WARNING, "%s", |
| 200 | "missing ')' in dasd parameter string\n"); |
| 201 | rc = -EINVAL; |
| 202 | } else |
| 203 | str++; |
| 204 | *endp = str; |
| 205 | if (rc != 0) |
| 206 | return rc; |
| 207 | return features; |
| 208 | } |
| 209 | |
| 210 | /* |
| 211 | * Try to match the first element on the comma separated parse string |
| 212 | * with one of the known keywords. If a keyword is found, take the approprate |
| 213 | * action and return a pointer to the residual string. If the first element |
| 214 | * could not be matched to any keyword then return an error code. |
| 215 | */ |
| 216 | static char * |
| 217 | dasd_parse_keyword( char *parsestring ) { |
| 218 | |
| 219 | char *nextcomma, *residual_str; |
| 220 | int length; |
| 221 | |
| 222 | nextcomma = strchr(parsestring,','); |
| 223 | if (nextcomma) { |
| 224 | length = nextcomma - parsestring; |
| 225 | residual_str = nextcomma + 1; |
| 226 | } else { |
| 227 | length = strlen(parsestring); |
| 228 | residual_str = parsestring + length; |
| 229 | } |
| 230 | if (strncmp ("autodetect", parsestring, length) == 0) { |
| 231 | dasd_autodetect = 1; |
| 232 | MESSAGE (KERN_INFO, "%s", |
| 233 | "turning to autodetection mode"); |
| 234 | return residual_str; |
| 235 | } |
| 236 | if (strncmp ("probeonly", parsestring, length) == 0) { |
| 237 | dasd_probeonly = 1; |
| 238 | MESSAGE(KERN_INFO, "%s", |
| 239 | "turning to probeonly mode"); |
| 240 | return residual_str; |
| 241 | } |
| 242 | if (strncmp ("fixedbuffers", parsestring, length) == 0) { |
| 243 | if (dasd_page_cache) |
| 244 | return residual_str; |
| 245 | dasd_page_cache = |
| 246 | kmem_cache_create("dasd_page_cache", PAGE_SIZE, 0, |
| 247 | SLAB_CACHE_DMA, NULL, NULL ); |
| 248 | if (!dasd_page_cache) |
| 249 | MESSAGE(KERN_WARNING, "%s", "Failed to create slab, " |
| 250 | "fixed buffer mode disabled."); |
| 251 | else |
| 252 | MESSAGE (KERN_INFO, "%s", |
| 253 | "turning on fixed buffer mode"); |
| 254 | return residual_str; |
| 255 | } |
| 256 | return ERR_PTR(-EINVAL); |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Try to interprete the first element on the comma separated parse string |
| 261 | * as a device number or a range of devices. If the interpretation is |
| 262 | * successfull, create the matching dasd_devmap entries and return a pointer |
| 263 | * to the residual string. |
| 264 | * If interpretation fails or in case of an error, return an error code. |
| 265 | */ |
| 266 | static char * |
| 267 | dasd_parse_range( char *parsestring ) { |
| 268 | |
| 269 | struct dasd_devmap *devmap; |
| 270 | int from, from_id0, from_id1; |
| 271 | int to, to_id0, to_id1; |
| 272 | int features, rc; |
| 273 | char bus_id[BUS_ID_SIZE+1], *str; |
| 274 | |
| 275 | str = parsestring; |
| 276 | rc = dasd_busid(&str, &from_id0, &from_id1, &from); |
| 277 | if (rc == 0) { |
| 278 | to = from; |
| 279 | to_id0 = from_id0; |
| 280 | to_id1 = from_id1; |
| 281 | if (*str == '-') { |
| 282 | str++; |
| 283 | rc = dasd_busid(&str, &to_id0, &to_id1, &to); |
| 284 | } |
| 285 | } |
| 286 | if (rc == 0 && |
| 287 | (from_id0 != to_id0 || from_id1 != to_id1 || from > to)) |
| 288 | rc = -EINVAL; |
| 289 | if (rc) { |
| 290 | MESSAGE(KERN_ERR, "Invalid device range %s", parsestring); |
| 291 | return ERR_PTR(rc); |
| 292 | } |
| 293 | features = dasd_feature_list(str, &str); |
| 294 | if (features < 0) |
| 295 | return ERR_PTR(-EINVAL); |
| 296 | while (from <= to) { |
| 297 | sprintf(bus_id, "%01x.%01x.%04x", |
| 298 | from_id0, from_id1, from++); |
| 299 | devmap = dasd_add_busid(bus_id, features); |
| 300 | if (IS_ERR(devmap)) |
| 301 | return (char *)devmap; |
| 302 | } |
| 303 | if (*str == ',') |
| 304 | return str + 1; |
| 305 | if (*str == '\0') |
| 306 | return str; |
| 307 | MESSAGE(KERN_WARNING, |
| 308 | "junk at end of dasd parameter string: %s\n", str); |
| 309 | return ERR_PTR(-EINVAL); |
| 310 | } |
| 311 | |
| 312 | static inline char * |
| 313 | dasd_parse_next_element( char *parsestring ) { |
| 314 | char * residual_str; |
| 315 | residual_str = dasd_parse_keyword(parsestring); |
| 316 | if (!IS_ERR(residual_str)) |
| 317 | return residual_str; |
| 318 | residual_str = dasd_parse_range(parsestring); |
| 319 | return residual_str; |
| 320 | } |
| 321 | |
| 322 | /* |
| 323 | * Parse parameters stored in dasd[] |
| 324 | * The 'dasd=...' parameter allows to specify a comma separated list of |
| 325 | * keywords and device ranges. When the dasd driver is build into the kernel, |
| 326 | * the complete list will be stored as one element of the dasd[] array. |
| 327 | * When the dasd driver is build as a module, then the list is broken into |
| 328 | * it's elements and each dasd[] entry contains one element. |
| 329 | */ |
| 330 | int |
| 331 | dasd_parse(void) |
| 332 | { |
| 333 | int rc, i; |
| 334 | char *parsestring; |
| 335 | |
| 336 | rc = 0; |
| 337 | for (i = 0; i < 256; i++) { |
| 338 | if (dasd[i] == NULL) |
| 339 | break; |
| 340 | parsestring = dasd[i]; |
| 341 | /* loop over the comma separated list in the parsestring */ |
| 342 | while (*parsestring) { |
| 343 | parsestring = dasd_parse_next_element(parsestring); |
| 344 | if(IS_ERR(parsestring)) { |
| 345 | rc = PTR_ERR(parsestring); |
| 346 | break; |
| 347 | } |
| 348 | } |
| 349 | if (rc) { |
| 350 | DBF_EVENT(DBF_ALERT, "%s", "invalid range found"); |
| 351 | break; |
| 352 | } |
| 353 | } |
| 354 | return rc; |
| 355 | } |
| 356 | |
| 357 | /* |
| 358 | * Add a devmap for the device specified by busid. It is possible that |
| 359 | * the devmap already exists (dasd= parameter). The order of the devices |
| 360 | * added through this function will define the kdevs for the individual |
| 361 | * devices. |
| 362 | */ |
| 363 | static struct dasd_devmap * |
| 364 | dasd_add_busid(char *bus_id, int features) |
| 365 | { |
| 366 | struct dasd_devmap *devmap, *new, *tmp; |
| 367 | int hash; |
| 368 | |
| 369 | new = (struct dasd_devmap *) |
| 370 | kmalloc(sizeof(struct dasd_devmap), GFP_KERNEL); |
| 371 | if (!new) |
| 372 | return ERR_PTR(-ENOMEM); |
| 373 | spin_lock(&dasd_devmap_lock); |
| 374 | devmap = 0; |
| 375 | hash = dasd_hash_busid(bus_id); |
| 376 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) |
| 377 | if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { |
| 378 | devmap = tmp; |
| 379 | break; |
| 380 | } |
| 381 | if (!devmap) { |
| 382 | /* This bus_id is new. */ |
| 383 | new->devindex = dasd_max_devindex++; |
| 384 | strncpy(new->bus_id, bus_id, BUS_ID_SIZE); |
| 385 | new->features = features; |
| 386 | new->device = 0; |
| 387 | list_add(&new->list, &dasd_hashlists[hash]); |
| 388 | devmap = new; |
| 389 | new = 0; |
| 390 | } |
| 391 | spin_unlock(&dasd_devmap_lock); |
Jesper Juhl | 17fd682 | 2005-11-07 01:01:30 -0800 | [diff] [blame] | 392 | kfree(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | return devmap; |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Find devmap for device with given bus_id. |
| 398 | */ |
| 399 | static struct dasd_devmap * |
| 400 | dasd_find_busid(char *bus_id) |
| 401 | { |
| 402 | struct dasd_devmap *devmap, *tmp; |
| 403 | int hash; |
| 404 | |
| 405 | spin_lock(&dasd_devmap_lock); |
| 406 | devmap = ERR_PTR(-ENODEV); |
| 407 | hash = dasd_hash_busid(bus_id); |
| 408 | list_for_each_entry(tmp, &dasd_hashlists[hash], list) { |
| 409 | if (strncmp(tmp->bus_id, bus_id, BUS_ID_SIZE) == 0) { |
| 410 | devmap = tmp; |
| 411 | break; |
| 412 | } |
| 413 | } |
| 414 | spin_unlock(&dasd_devmap_lock); |
| 415 | return devmap; |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Check if busid has been added to the list of dasd ranges. |
| 420 | */ |
| 421 | int |
| 422 | dasd_busid_known(char *bus_id) |
| 423 | { |
| 424 | return IS_ERR(dasd_find_busid(bus_id)) ? -ENOENT : 0; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | * Forget all about the device numbers added so far. |
| 429 | * This may only be called at module unload or system shutdown. |
| 430 | */ |
| 431 | static void |
| 432 | dasd_forget_ranges(void) |
| 433 | { |
| 434 | struct dasd_devmap *devmap, *n; |
| 435 | int i; |
| 436 | |
| 437 | spin_lock(&dasd_devmap_lock); |
| 438 | for (i = 0; i < 256; i++) { |
| 439 | list_for_each_entry_safe(devmap, n, &dasd_hashlists[i], list) { |
Eric Sesterhenn | 606f442 | 2006-03-26 18:33:07 +0200 | [diff] [blame] | 440 | BUG_ON(devmap->device != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | list_del(&devmap->list); |
| 442 | kfree(devmap); |
| 443 | } |
| 444 | } |
| 445 | spin_unlock(&dasd_devmap_lock); |
| 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Find the device struct by its device index. |
| 450 | */ |
| 451 | struct dasd_device * |
| 452 | dasd_device_from_devindex(int devindex) |
| 453 | { |
| 454 | struct dasd_devmap *devmap, *tmp; |
| 455 | struct dasd_device *device; |
| 456 | int i; |
| 457 | |
| 458 | spin_lock(&dasd_devmap_lock); |
| 459 | devmap = 0; |
| 460 | for (i = 0; (i < 256) && !devmap; i++) |
| 461 | list_for_each_entry(tmp, &dasd_hashlists[i], list) |
| 462 | if (tmp->devindex == devindex) { |
| 463 | /* Found the devmap for the device. */ |
| 464 | devmap = tmp; |
| 465 | break; |
| 466 | } |
| 467 | if (devmap && devmap->device) { |
| 468 | device = devmap->device; |
| 469 | dasd_get_device(device); |
| 470 | } else |
| 471 | device = ERR_PTR(-ENODEV); |
| 472 | spin_unlock(&dasd_devmap_lock); |
| 473 | return device; |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Return devmap for cdev. If no devmap exists yet, create one and |
| 478 | * connect it to the cdev. |
| 479 | */ |
| 480 | static struct dasd_devmap * |
| 481 | dasd_devmap_from_cdev(struct ccw_device *cdev) |
| 482 | { |
| 483 | struct dasd_devmap *devmap; |
| 484 | |
| 485 | devmap = dasd_find_busid(cdev->dev.bus_id); |
| 486 | if (IS_ERR(devmap)) |
| 487 | devmap = dasd_add_busid(cdev->dev.bus_id, |
| 488 | DASD_FEATURE_DEFAULT); |
| 489 | return devmap; |
| 490 | } |
| 491 | |
| 492 | /* |
| 493 | * Create a dasd device structure for cdev. |
| 494 | */ |
| 495 | struct dasd_device * |
| 496 | dasd_create_device(struct ccw_device *cdev) |
| 497 | { |
| 498 | struct dasd_devmap *devmap; |
| 499 | struct dasd_device *device; |
| 500 | int rc; |
| 501 | |
| 502 | devmap = dasd_devmap_from_cdev(cdev); |
| 503 | if (IS_ERR(devmap)) |
| 504 | return (void *) devmap; |
| 505 | cdev->dev.driver_data = devmap; |
| 506 | |
| 507 | device = dasd_alloc_device(); |
| 508 | if (IS_ERR(device)) |
| 509 | return device; |
| 510 | atomic_set(&device->ref_count, 2); |
| 511 | |
| 512 | spin_lock(&dasd_devmap_lock); |
| 513 | if (!devmap->device) { |
| 514 | devmap->device = device; |
| 515 | device->devindex = devmap->devindex; |
Horst Hummel | c6eb7b7 | 2005-09-03 15:57:58 -0700 | [diff] [blame] | 516 | device->features = devmap->features; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | get_device(&cdev->dev); |
| 518 | device->cdev = cdev; |
| 519 | rc = 0; |
| 520 | } else |
| 521 | /* Someone else was faster. */ |
| 522 | rc = -EBUSY; |
| 523 | spin_unlock(&dasd_devmap_lock); |
| 524 | |
| 525 | if (rc) { |
| 526 | dasd_free_device(device); |
| 527 | return ERR_PTR(rc); |
| 528 | } |
| 529 | return device; |
| 530 | } |
| 531 | |
| 532 | /* |
| 533 | * Wait queue for dasd_delete_device waits. |
| 534 | */ |
| 535 | static DECLARE_WAIT_QUEUE_HEAD(dasd_delete_wq); |
| 536 | |
| 537 | /* |
| 538 | * Remove a dasd device structure. The passed referenced |
| 539 | * is destroyed. |
| 540 | */ |
| 541 | void |
| 542 | dasd_delete_device(struct dasd_device *device) |
| 543 | { |
| 544 | struct ccw_device *cdev; |
| 545 | struct dasd_devmap *devmap; |
| 546 | |
| 547 | /* First remove device pointer from devmap. */ |
| 548 | devmap = dasd_find_busid(device->cdev->dev.bus_id); |
Eric Sesterhenn | 606f442 | 2006-03-26 18:33:07 +0200 | [diff] [blame] | 549 | BUG_ON(IS_ERR(devmap)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | spin_lock(&dasd_devmap_lock); |
| 551 | if (devmap->device != device) { |
| 552 | spin_unlock(&dasd_devmap_lock); |
| 553 | dasd_put_device(device); |
| 554 | return; |
| 555 | } |
| 556 | devmap->device = NULL; |
| 557 | spin_unlock(&dasd_devmap_lock); |
| 558 | |
| 559 | /* Drop ref_count by 2, one for the devmap reference and |
| 560 | * one for the passed reference. */ |
| 561 | atomic_sub(2, &device->ref_count); |
| 562 | |
| 563 | /* Wait for reference counter to drop to zero. */ |
| 564 | wait_event(dasd_delete_wq, atomic_read(&device->ref_count) == 0); |
| 565 | |
| 566 | /* Disconnect dasd_device structure from ccw_device structure. */ |
| 567 | cdev = device->cdev; |
| 568 | device->cdev = NULL; |
| 569 | |
| 570 | /* Disconnect dasd_devmap structure from ccw_device structure. */ |
| 571 | cdev->dev.driver_data = NULL; |
| 572 | |
| 573 | /* Put ccw_device structure. */ |
| 574 | put_device(&cdev->dev); |
| 575 | |
| 576 | /* Now the device structure can be freed. */ |
| 577 | dasd_free_device(device); |
| 578 | } |
| 579 | |
| 580 | /* |
| 581 | * Reference counter dropped to zero. Wake up waiter |
| 582 | * in dasd_delete_device. |
| 583 | */ |
| 584 | void |
| 585 | dasd_put_device_wake(struct dasd_device *device) |
| 586 | { |
| 587 | wake_up(&dasd_delete_wq); |
| 588 | } |
| 589 | |
| 590 | /* |
| 591 | * Return dasd_device structure associated with cdev. |
| 592 | */ |
| 593 | struct dasd_device * |
| 594 | dasd_device_from_cdev(struct ccw_device *cdev) |
| 595 | { |
| 596 | struct dasd_devmap *devmap; |
| 597 | struct dasd_device *device; |
| 598 | |
| 599 | device = ERR_PTR(-ENODEV); |
| 600 | spin_lock(&dasd_devmap_lock); |
| 601 | devmap = cdev->dev.driver_data; |
| 602 | if (devmap && devmap->device) { |
| 603 | device = devmap->device; |
| 604 | dasd_get_device(device); |
| 605 | } |
| 606 | spin_unlock(&dasd_devmap_lock); |
| 607 | return device; |
| 608 | } |
| 609 | |
| 610 | /* |
| 611 | * SECTION: files in sysfs |
| 612 | */ |
| 613 | |
| 614 | /* |
| 615 | * readonly controls the readonly status of a dasd |
| 616 | */ |
| 617 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 618 | dasd_ro_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | { |
| 620 | struct dasd_devmap *devmap; |
| 621 | int ro_flag; |
| 622 | |
| 623 | devmap = dasd_find_busid(dev->bus_id); |
| 624 | if (!IS_ERR(devmap)) |
| 625 | ro_flag = (devmap->features & DASD_FEATURE_READONLY) != 0; |
| 626 | else |
| 627 | ro_flag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_READONLY) != 0; |
| 628 | return snprintf(buf, PAGE_SIZE, ro_flag ? "1\n" : "0\n"); |
| 629 | } |
| 630 | |
| 631 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 632 | dasd_ro_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | { |
| 634 | struct dasd_devmap *devmap; |
| 635 | int ro_flag; |
| 636 | |
| 637 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); |
| 638 | if (IS_ERR(devmap)) |
| 639 | return PTR_ERR(devmap); |
| 640 | ro_flag = buf[0] == '1'; |
| 641 | spin_lock(&dasd_devmap_lock); |
| 642 | if (ro_flag) |
| 643 | devmap->features |= DASD_FEATURE_READONLY; |
| 644 | else |
| 645 | devmap->features &= ~DASD_FEATURE_READONLY; |
Horst Hummel | c6eb7b7 | 2005-09-03 15:57:58 -0700 | [diff] [blame] | 646 | if (devmap->device) |
| 647 | devmap->device->features = devmap->features; |
Horst Hummel | f24acd4 | 2005-05-01 08:58:59 -0700 | [diff] [blame] | 648 | if (devmap->device && devmap->device->gdp) |
| 649 | set_disk_ro(devmap->device->gdp, ro_flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | spin_unlock(&dasd_devmap_lock); |
| 651 | return count; |
| 652 | } |
| 653 | |
| 654 | static DEVICE_ATTR(readonly, 0644, dasd_ro_show, dasd_ro_store); |
| 655 | |
| 656 | /* |
| 657 | * use_diag controls whether the driver should use diag rather than ssch |
| 658 | * to talk to the device |
| 659 | */ |
| 660 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 661 | dasd_use_diag_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | { |
| 663 | struct dasd_devmap *devmap; |
| 664 | int use_diag; |
| 665 | |
| 666 | devmap = dasd_find_busid(dev->bus_id); |
| 667 | if (!IS_ERR(devmap)) |
| 668 | use_diag = (devmap->features & DASD_FEATURE_USEDIAG) != 0; |
| 669 | else |
| 670 | use_diag = (DASD_FEATURE_DEFAULT & DASD_FEATURE_USEDIAG) != 0; |
| 671 | return sprintf(buf, use_diag ? "1\n" : "0\n"); |
| 672 | } |
| 673 | |
| 674 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 675 | dasd_use_diag_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | { |
| 677 | struct dasd_devmap *devmap; |
| 678 | ssize_t rc; |
| 679 | int use_diag; |
| 680 | |
| 681 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); |
| 682 | if (IS_ERR(devmap)) |
| 683 | return PTR_ERR(devmap); |
| 684 | use_diag = buf[0] == '1'; |
| 685 | spin_lock(&dasd_devmap_lock); |
| 686 | /* Changing diag discipline flag is only allowed in offline state. */ |
| 687 | rc = count; |
| 688 | if (!devmap->device) { |
| 689 | if (use_diag) |
| 690 | devmap->features |= DASD_FEATURE_USEDIAG; |
| 691 | else |
| 692 | devmap->features &= ~DASD_FEATURE_USEDIAG; |
| 693 | } else |
| 694 | rc = -EPERM; |
| 695 | spin_unlock(&dasd_devmap_lock); |
| 696 | return rc; |
| 697 | } |
| 698 | |
| 699 | static |
| 700 | DEVICE_ATTR(use_diag, 0644, dasd_use_diag_show, dasd_use_diag_store); |
| 701 | |
| 702 | static ssize_t |
Yani Ioannou | e404e27 | 2005-05-17 06:42:58 -0400 | [diff] [blame] | 703 | dasd_discipline_show(struct device *dev, struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | { |
| 705 | struct dasd_devmap *devmap; |
| 706 | char *dname; |
| 707 | |
| 708 | spin_lock(&dasd_devmap_lock); |
| 709 | dname = "none"; |
| 710 | devmap = dev->driver_data; |
| 711 | if (devmap && devmap->device && devmap->device->discipline) |
| 712 | dname = devmap->device->discipline->name; |
| 713 | spin_unlock(&dasd_devmap_lock); |
| 714 | return snprintf(buf, PAGE_SIZE, "%s\n", dname); |
| 715 | } |
| 716 | |
| 717 | static DEVICE_ATTR(discipline, 0444, dasd_discipline_show, NULL); |
| 718 | |
Stefan Weinhuber | 20c6446 | 2006-03-24 03:15:25 -0800 | [diff] [blame] | 719 | /* |
| 720 | * extended error-reporting |
| 721 | */ |
| 722 | static ssize_t |
| 723 | dasd_eer_show(struct device *dev, struct device_attribute *attr, char *buf) |
| 724 | { |
| 725 | struct dasd_devmap *devmap; |
| 726 | int eer_flag; |
| 727 | |
| 728 | devmap = dasd_find_busid(dev->bus_id); |
| 729 | if (!IS_ERR(devmap) && devmap->device) |
| 730 | eer_flag = dasd_eer_enabled(devmap->device); |
| 731 | else |
| 732 | eer_flag = 0; |
| 733 | return snprintf(buf, PAGE_SIZE, eer_flag ? "1\n" : "0\n"); |
| 734 | } |
| 735 | |
| 736 | static ssize_t |
| 737 | dasd_eer_store(struct device *dev, struct device_attribute *attr, |
| 738 | const char *buf, size_t count) |
| 739 | { |
| 740 | struct dasd_devmap *devmap; |
| 741 | int rc; |
| 742 | |
| 743 | devmap = dasd_devmap_from_cdev(to_ccwdev(dev)); |
| 744 | if (IS_ERR(devmap)) |
| 745 | return PTR_ERR(devmap); |
| 746 | if (!devmap->device) |
| 747 | return count; |
| 748 | if (buf[0] == '1') { |
| 749 | rc = dasd_eer_enable(devmap->device); |
| 750 | if (rc) |
| 751 | return rc; |
| 752 | } else |
| 753 | dasd_eer_disable(devmap->device); |
| 754 | return count; |
| 755 | } |
| 756 | |
| 757 | static DEVICE_ATTR(eer_enabled, 0644, dasd_eer_show, dasd_eer_store); |
| 758 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | static struct attribute * dasd_attrs[] = { |
| 760 | &dev_attr_readonly.attr, |
| 761 | &dev_attr_discipline.attr, |
| 762 | &dev_attr_use_diag.attr, |
Stefan Weinhuber | 20c6446 | 2006-03-24 03:15:25 -0800 | [diff] [blame] | 763 | &dev_attr_eer_enabled.attr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | NULL, |
| 765 | }; |
| 766 | |
| 767 | static struct attribute_group dasd_attr_group = { |
| 768 | .attrs = dasd_attrs, |
| 769 | }; |
| 770 | |
Horst Hummel | f24acd4 | 2005-05-01 08:58:59 -0700 | [diff] [blame] | 771 | /* |
| 772 | * Return value of the specified feature. |
| 773 | */ |
| 774 | int |
| 775 | dasd_get_feature(struct ccw_device *cdev, int feature) |
| 776 | { |
| 777 | struct dasd_devmap *devmap; |
| 778 | |
| 779 | devmap = dasd_find_busid(cdev->dev.bus_id); |
| 780 | if (IS_ERR(devmap)) |
| 781 | return (int) PTR_ERR(devmap); |
| 782 | |
| 783 | return ((devmap->features & feature) != 0); |
| 784 | } |
| 785 | |
| 786 | /* |
| 787 | * Set / reset given feature. |
| 788 | * Flag indicates wether to set (!=0) or the reset (=0) the feature. |
| 789 | */ |
| 790 | int |
| 791 | dasd_set_feature(struct ccw_device *cdev, int feature, int flag) |
| 792 | { |
| 793 | struct dasd_devmap *devmap; |
| 794 | |
| 795 | devmap = dasd_find_busid(cdev->dev.bus_id); |
| 796 | if (IS_ERR(devmap)) |
| 797 | return (int) PTR_ERR(devmap); |
| 798 | |
| 799 | spin_lock(&dasd_devmap_lock); |
| 800 | if (flag) |
| 801 | devmap->features |= feature; |
| 802 | else |
| 803 | devmap->features &= ~feature; |
Horst Hummel | c6eb7b7 | 2005-09-03 15:57:58 -0700 | [diff] [blame] | 804 | if (devmap->device) |
| 805 | devmap->device->features = devmap->features; |
Horst Hummel | f24acd4 | 2005-05-01 08:58:59 -0700 | [diff] [blame] | 806 | spin_unlock(&dasd_devmap_lock); |
| 807 | return 0; |
| 808 | } |
| 809 | |
| 810 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | int |
| 812 | dasd_add_sysfs_files(struct ccw_device *cdev) |
| 813 | { |
| 814 | return sysfs_create_group(&cdev->dev.kobj, &dasd_attr_group); |
| 815 | } |
| 816 | |
| 817 | void |
| 818 | dasd_remove_sysfs_files(struct ccw_device *cdev) |
| 819 | { |
| 820 | sysfs_remove_group(&cdev->dev.kobj, &dasd_attr_group); |
| 821 | } |
| 822 | |
| 823 | |
| 824 | int |
| 825 | dasd_devmap_init(void) |
| 826 | { |
| 827 | int i; |
| 828 | |
| 829 | /* Initialize devmap structures. */ |
| 830 | dasd_max_devindex = 0; |
| 831 | for (i = 0; i < 256; i++) |
| 832 | INIT_LIST_HEAD(&dasd_hashlists[i]); |
| 833 | return 0; |
| 834 | |
| 835 | } |
| 836 | |
| 837 | void |
| 838 | dasd_devmap_exit(void) |
| 839 | { |
| 840 | dasd_forget_ranges(); |
| 841 | } |