1 /* 2 * File...........: linux/drivers/s390/block/dasd_int.h 3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Horst Hummel <Horst.Hummel@de.ibm.com> 5 * Martin Schwidefsky <schwidefsky@de.ibm.com> 6 * Bugreports.to..: <Linux390@de.ibm.com> 7 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000 8 * 9 */ 10 11 #ifndef DASD_INT_H 12 #define DASD_INT_H 13 14 #ifdef __KERNEL__ 15 16 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */ 17 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS)) 18 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1) 19 20 /* 21 * States a dasd device can have: 22 * new: the dasd_device structure is allocated. 23 * known: the discipline for the device is identified. 24 * basic: the device can do basic i/o. 25 * unfmt: the device could not be analyzed (format is unknown). 26 * ready: partition detection is done and the device is can do block io. 27 * online: the device accepts requests from the block device queue. 28 * 29 * Things to do for startup state transitions: 30 * new -> known: find discipline for the device and create devfs entries. 31 * known -> basic: request irq line for the device. 32 * basic -> ready: do the initial analysis, e.g. format detection, 33 * do block device setup and detect partitions. 34 * ready -> online: schedule the device tasklet. 35 * Things to do for shutdown state transitions: 36 * online -> ready: just set the new device state. 37 * ready -> basic: flush requests from the block device layer, clear 38 * partition information and reset format information. 39 * basic -> known: terminate all requests and free irq. 40 * known -> new: remove devfs entries and forget discipline. 41 */ 42 43 #define DASD_STATE_NEW 0 44 #define DASD_STATE_KNOWN 1 45 #define DASD_STATE_BASIC 2 46 #define DASD_STATE_UNFMT 3 47 #define DASD_STATE_READY 4 48 #define DASD_STATE_ONLINE 5 49 50 #include <linux/module.h> 51 #include <linux/wait.h> 52 #include <linux/blkdev.h> 53 #include <linux/genhd.h> 54 #include <linux/hdreg.h> 55 #include <linux/interrupt.h> 56 #include <asm/ccwdev.h> 57 #include <linux/workqueue.h> 58 #include <asm/debug.h> 59 #include <asm/dasd.h> 60 #include <asm/idals.h> 61 62 /* 63 * SECTION: Type definitions 64 */ 65 struct dasd_device; 66 67 typedef enum { 68 dasd_era_fatal = -1, /* no chance to recover */ 69 dasd_era_none = 0, /* don't recover, everything alright */ 70 dasd_era_msg = 1, /* don't recover, just report... */ 71 dasd_era_recover = 2 /* recovery action recommended */ 72 } dasd_era_t; 73 74 /* BIT DEFINITIONS FOR SENSE DATA */ 75 #define DASD_SENSE_BIT_0 0x80 76 #define DASD_SENSE_BIT_1 0x40 77 #define DASD_SENSE_BIT_2 0x20 78 #define DASD_SENSE_BIT_3 0x10 79 80 /* 81 * SECTION: MACROs for klogd and s390 debug feature (dbf) 82 */ 83 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ 84 do { \ 85 debug_sprintf_event(d_device->debug_area, \ 86 d_level, \ 87 d_str "\n", \ 88 d_data); \ 89 } while(0) 90 91 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \ 92 do { \ 93 debug_sprintf_exception(d_device->debug_area, \ 94 d_level, \ 95 d_str "\n", \ 96 d_data); \ 97 } while(0) 98 99 #define DBF_EVENT(d_level, d_str, d_data...)\ 100 do { \ 101 debug_sprintf_event(dasd_debug_area, \ 102 d_level,\ 103 d_str "\n", \ 104 d_data); \ 105 } while(0) 106 107 #define DBF_EXC(d_level, d_str, d_data...)\ 108 do { \ 109 debug_sprintf_exception(dasd_debug_area, \ 110 d_level,\ 111 d_str "\n", \ 112 d_data); \ 113 } while(0) 114 115 /* definition of dbf debug levels */ 116 #define DBF_EMERG 0 /* system is unusable */ 117 #define DBF_ALERT 1 /* action must be taken immediately */ 118 #define DBF_CRIT 2 /* critical conditions */ 119 #define DBF_ERR 3 /* error conditions */ 120 #define DBF_WARNING 4 /* warning conditions */ 121 #define DBF_NOTICE 5 /* normal but significant condition */ 122 #define DBF_INFO 6 /* informational */ 123 #define DBF_DEBUG 6 /* debug-level messages */ 124 125 /* messages to be written via klogd and dbf */ 126 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ 127 do { \ 128 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 129 d_device->cdev->dev.bus_id, d_args); \ 130 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ 131 } while(0) 132 133 #define MESSAGE(d_loglevel,d_string,d_args...)\ 134 do { \ 135 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 136 DBF_EVENT(DBF_ALERT, d_string, d_args); \ 137 } while(0) 138 139 /* messages to be written via klogd only */ 140 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ 141 do { \ 142 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 143 d_device->cdev->dev.bus_id, d_args); \ 144 } while(0) 145 146 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ 147 do { \ 148 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 149 } while(0) 150 151 struct dasd_ccw_req { 152 unsigned int magic; /* Eye catcher */ 153 struct list_head list; /* list_head for request queueing. */ 154 155 /* Where to execute what... */ 156 struct dasd_device *device; /* device the request is for */ 157 struct ccw1 *cpaddr; /* address of channel program */ 158 char status; /* status of this request */ 159 short retries; /* A retry counter */ 160 unsigned long flags; /* flags of this request */ 161 162 /* ... and how */ 163 unsigned long starttime; /* jiffies time of request start */ 164 int expires; /* expiration period in jiffies */ 165 char lpm; /* logical path mask */ 166 void *data; /* pointer to data area */ 167 168 /* these are important for recovering erroneous requests */ 169 struct irb irb; /* device status in case of an error */ 170 struct dasd_ccw_req *refers; /* ERP-chain queueing. */ 171 void *function; /* originating ERP action */ 172 173 /* these are for statistics only */ 174 unsigned long long buildclk; /* TOD-clock of request generation */ 175 unsigned long long startclk; /* TOD-clock of request start */ 176 unsigned long long stopclk; /* TOD-clock of request interrupt */ 177 unsigned long long endclk; /* TOD-clock of request termination */ 178 179 /* Callback that is called after reaching final status. */ 180 void (*callback)(struct dasd_ccw_req *, void *data); 181 void *callback_data; 182 }; 183 184 /* 185 * dasd_ccw_req -> status can be: 186 */ 187 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ 188 #define DASD_CQR_QUEUED 0x01 /* request is queued to be processed */ 189 #define DASD_CQR_IN_IO 0x02 /* request is currently in IO */ 190 #define DASD_CQR_DONE 0x03 /* request is completed successfully */ 191 #define DASD_CQR_ERROR 0x04 /* request is completed with error */ 192 #define DASD_CQR_FAILED 0x05 /* request is finally failed */ 193 #define DASD_CQR_CLEAR 0x06 /* request is clear pending */ 194 195 /* per dasd_ccw_req flags */ 196 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ 197 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ 198 199 /* Signature for error recovery functions. */ 200 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 201 202 /* 203 * the struct dasd_discipline is 204 * sth like a table of virtual functions, if you think of dasd_eckd 205 * inheriting dasd... 206 * no, currently we are not planning to reimplement the driver in C++ 207 */ 208 struct dasd_discipline { 209 struct module *owner; 210 char ebcname[8]; /* a name used for tagging and printks */ 211 char name[8]; /* a name used for tagging and printks */ 212 int max_blocks; /* maximum number of blocks to be chained */ 213 214 struct list_head list; /* used for list of disciplines */ 215 216 /* 217 * Device recognition functions. check_device is used to verify 218 * the sense data and the information returned by read device 219 * characteristics. It returns 0 if the discipline can be used 220 * for the device in question. 221 * do_analysis is used in the step from device state "basic" to 222 * state "accept". It returns 0 if the device can be made ready, 223 * it returns -EMEDIUMTYPE if the device can't be made ready or 224 * -EAGAIN if do_analysis started a ccw that needs to complete 225 * before the analysis may be repeated. 226 */ 227 int (*check_device)(struct dasd_device *); 228 int (*do_analysis) (struct dasd_device *); 229 230 /* 231 * Device operation functions. build_cp creates a ccw chain for 232 * a block device request, start_io starts the request and 233 * term_IO cancels it (e.g. in case of a timeout). format_device 234 * returns a ccw chain to be used to format the device. 235 */ 236 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 237 struct request *); 238 int (*start_IO) (struct dasd_ccw_req *); 239 int (*term_IO) (struct dasd_ccw_req *); 240 struct dasd_ccw_req *(*format_device) (struct dasd_device *, 241 struct format_data_t *); 242 int (*free_cp) (struct dasd_ccw_req *, struct request *); 243 /* 244 * Error recovery functions. examine_error() returns a value that 245 * indicates what to do for an error condition. If examine_error() 246 * returns 'dasd_era_recover' erp_action() is called to create a 247 * special error recovery ccw. erp_postaction() is called after 248 * an error recovery ccw has finished its execution. dump_sense 249 * is called for every error condition to print the sense data 250 * to the console. 251 */ 252 dasd_era_t(*examine_error) (struct dasd_ccw_req *, struct irb *); 253 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 254 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 255 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 256 struct irb *); 257 258 /* i/o control functions. */ 259 int (*fill_geometry) (struct dasd_device *, struct hd_geometry *); 260 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 261 int (*ioctl) (struct dasd_device *, unsigned int, void __user *); 262 }; 263 264 extern struct dasd_discipline *dasd_diag_discipline_pointer; 265 266 /* 267 * Unique identifier for dasd device. 268 */ 269 struct dasd_uid { 270 __u8 alias; 271 char vendor[4]; 272 char serial[15]; 273 __u16 ssid; 274 __u8 unit_addr; 275 }; 276 277 /* 278 * Notification numbers for extended error reporting notifications: 279 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 280 * eer pointer) is freed. The error reporting module needs to do all necessary 281 * cleanup steps. 282 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 283 */ 284 #define DASD_EER_DISABLE 0 285 #define DASD_EER_TRIGGER 1 286 287 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 288 #define DASD_EER_FATALERROR 1 289 #define DASD_EER_NOPATH 2 290 #define DASD_EER_STATECHANGE 3 291 #define DASD_EER_PPRCSUSPEND 4 292 293 struct dasd_device { 294 /* Block device stuff. */ 295 struct gendisk *gdp; 296 request_queue_t *request_queue; 297 spinlock_t request_queue_lock; 298 struct block_device *bdev; 299 unsigned int devindex; 300 unsigned long blocks; /* size of volume in blocks */ 301 unsigned int bp_block; /* bytes per block */ 302 unsigned int s2b_shift; /* log2 (bp_block/512) */ 303 unsigned long flags; /* per device flags */ 304 unsigned short features; /* copy of devmap-features (read-only!) */ 305 306 /* extended error reporting stuff (eer) */ 307 struct dasd_ccw_req *eer_cqr; 308 309 /* Device discipline stuff. */ 310 struct dasd_discipline *discipline; 311 struct dasd_discipline *base_discipline; 312 char *private; 313 314 /* Device state and target state. */ 315 int state, target; 316 int stopped; /* device (ccw_device_start) was stopped */ 317 318 /* Open and reference count. */ 319 atomic_t ref_count; 320 atomic_t open_count; 321 322 /* ccw queue and memory for static ccw/erp buffers. */ 323 struct list_head ccw_queue; 324 spinlock_t mem_lock; 325 void *ccw_mem; 326 void *erp_mem; 327 struct list_head ccw_chunks; 328 struct list_head erp_chunks; 329 330 atomic_t tasklet_scheduled; 331 struct tasklet_struct tasklet; 332 struct work_struct kick_work; 333 struct timer_list timer; 334 335 debug_info_t *debug_area; 336 337 struct ccw_device *cdev; 338 339 #ifdef CONFIG_DASD_PROFILE 340 struct dasd_profile_info_t profile; 341 #endif 342 }; 343 344 /* reasons why device (ccw_device_start) was stopped */ 345 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 346 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 347 #define DASD_STOPPED_PENDING 4 /* long busy */ 348 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 349 #define DASD_STOPPED_DC_EIO 16 /* disconnected, return -EIO */ 350 351 /* per device flags */ 352 #define DASD_FLAG_DSC_ERROR 2 /* return -EIO when disconnected */ 353 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 354 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 355 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 356 357 void dasd_put_device_wake(struct dasd_device *); 358 359 /* 360 * Reference count inliners 361 */ 362 static inline void 363 dasd_get_device(struct dasd_device *device) 364 { 365 atomic_inc(&device->ref_count); 366 } 367 368 static inline void 369 dasd_put_device(struct dasd_device *device) 370 { 371 if (atomic_dec_return(&device->ref_count) == 0) 372 dasd_put_device_wake(device); 373 } 374 375 /* 376 * The static memory in ccw_mem and erp_mem is managed by a sorted 377 * list of free memory chunks. 378 */ 379 struct dasd_mchunk 380 { 381 struct list_head list; 382 unsigned long size; 383 } __attribute__ ((aligned(8))); 384 385 static inline void 386 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 387 unsigned long size) 388 { 389 struct dasd_mchunk *chunk; 390 391 INIT_LIST_HEAD(chunk_list); 392 chunk = (struct dasd_mchunk *) mem; 393 chunk->size = size - sizeof(struct dasd_mchunk); 394 list_add(&chunk->list, chunk_list); 395 } 396 397 static inline void * 398 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 399 { 400 struct dasd_mchunk *chunk, *tmp; 401 402 size = (size + 7L) & -8L; 403 list_for_each_entry(chunk, chunk_list, list) { 404 if (chunk->size < size) 405 continue; 406 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 407 char *endaddr = (char *) (chunk + 1) + chunk->size; 408 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 409 tmp->size = size; 410 chunk->size -= size + sizeof(struct dasd_mchunk); 411 chunk = tmp; 412 } else 413 list_del(&chunk->list); 414 return (void *) (chunk + 1); 415 } 416 return NULL; 417 } 418 419 static inline void 420 dasd_free_chunk(struct list_head *chunk_list, void *mem) 421 { 422 struct dasd_mchunk *chunk, *tmp; 423 struct list_head *p, *left; 424 425 chunk = (struct dasd_mchunk *) 426 ((char *) mem - sizeof(struct dasd_mchunk)); 427 /* Find out the left neighbour in chunk_list. */ 428 left = chunk_list; 429 list_for_each(p, chunk_list) { 430 if (list_entry(p, struct dasd_mchunk, list) > chunk) 431 break; 432 left = p; 433 } 434 /* Try to merge with right neighbour = next element from left. */ 435 if (left->next != chunk_list) { 436 tmp = list_entry(left->next, struct dasd_mchunk, list); 437 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 438 list_del(&tmp->list); 439 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 440 } 441 } 442 /* Try to merge with left neighbour. */ 443 if (left != chunk_list) { 444 tmp = list_entry(left, struct dasd_mchunk, list); 445 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 446 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 447 return; 448 } 449 } 450 __list_add(&chunk->list, left, left->next); 451 } 452 453 /* 454 * Check if bsize is in { 512, 1024, 2048, 4096 } 455 */ 456 static inline int 457 dasd_check_blocksize(int bsize) 458 { 459 if (bsize < 512 || bsize > 4096 || (bsize & (bsize - 1)) != 0) 460 return -EMEDIUMTYPE; 461 return 0; 462 } 463 464 /* externals in dasd.c */ 465 #define DASD_PROFILE_ON 1 466 #define DASD_PROFILE_OFF 0 467 468 extern debug_info_t *dasd_debug_area; 469 extern struct dasd_profile_info_t dasd_global_profile; 470 extern unsigned int dasd_profile_level; 471 extern struct block_device_operations dasd_device_operations; 472 473 extern struct kmem_cache *dasd_page_cache; 474 475 struct dasd_ccw_req * 476 dasd_kmalloc_request(char *, int, int, struct dasd_device *); 477 struct dasd_ccw_req * 478 dasd_smalloc_request(char *, int, int, struct dasd_device *); 479 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 480 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 481 482 static inline int 483 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 484 { 485 return set_normalized_cda(ccw, cda); 486 } 487 488 struct dasd_device *dasd_alloc_device(void); 489 void dasd_free_device(struct dasd_device *); 490 491 void dasd_enable_device(struct dasd_device *); 492 void dasd_set_target_state(struct dasd_device *, int); 493 void dasd_kick_device(struct dasd_device *); 494 495 void dasd_add_request_head(struct dasd_ccw_req *); 496 void dasd_add_request_tail(struct dasd_ccw_req *); 497 int dasd_start_IO(struct dasd_ccw_req *); 498 int dasd_term_IO(struct dasd_ccw_req *); 499 void dasd_schedule_bh(struct dasd_device *); 500 int dasd_sleep_on(struct dasd_ccw_req *); 501 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 502 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 503 void dasd_set_timer(struct dasd_device *, int); 504 void dasd_clear_timer(struct dasd_device *); 505 int dasd_cancel_req(struct dasd_ccw_req *); 506 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 507 void dasd_generic_remove (struct ccw_device *cdev); 508 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 509 int dasd_generic_set_offline (struct ccw_device *cdev); 510 int dasd_generic_notify(struct ccw_device *, int); 511 512 /* externals in dasd_devmap.c */ 513 extern int dasd_max_devindex; 514 extern int dasd_probeonly; 515 extern int dasd_autodetect; 516 extern int dasd_nopav; 517 518 int dasd_devmap_init(void); 519 void dasd_devmap_exit(void); 520 521 struct dasd_device *dasd_create_device(struct ccw_device *); 522 void dasd_delete_device(struct dasd_device *); 523 524 int dasd_get_uid(struct ccw_device *, struct dasd_uid *); 525 int dasd_set_uid(struct ccw_device *, struct dasd_uid *); 526 int dasd_get_feature(struct ccw_device *, int); 527 int dasd_set_feature(struct ccw_device *, int, int); 528 529 int dasd_add_sysfs_files(struct ccw_device *); 530 void dasd_remove_sysfs_files(struct ccw_device *); 531 532 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 533 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 534 struct dasd_device *dasd_device_from_devindex(int); 535 536 int dasd_parse(void); 537 int dasd_busid_known(char *); 538 539 /* externals in dasd_gendisk.c */ 540 int dasd_gendisk_init(void); 541 void dasd_gendisk_exit(void); 542 int dasd_gendisk_alloc(struct dasd_device *); 543 void dasd_gendisk_free(struct dasd_device *); 544 int dasd_scan_partitions(struct dasd_device *); 545 void dasd_destroy_partitions(struct dasd_device *); 546 547 /* externals in dasd_ioctl.c */ 548 int dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long); 549 long dasd_compat_ioctl(struct file *, unsigned int, unsigned long); 550 551 /* externals in dasd_proc.c */ 552 int dasd_proc_init(void); 553 void dasd_proc_exit(void); 554 555 /* externals in dasd_erp.c */ 556 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 557 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 558 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 559 struct dasd_device *); 560 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 561 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 562 563 /* externals in dasd_3370_erp.c */ 564 dasd_era_t dasd_3370_erp_examine(struct dasd_ccw_req *, struct irb *); 565 566 /* externals in dasd_3990_erp.c */ 567 dasd_era_t dasd_3990_erp_examine(struct dasd_ccw_req *, struct irb *); 568 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 569 570 /* externals in dasd_9336_erp.c */ 571 dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *); 572 573 /* externals in dasd_9336_erp.c */ 574 dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *); 575 struct dasd_ccw_req *dasd_9343_erp_action(struct dasd_ccw_req *); 576 577 /* externals in dasd_eer.c */ 578 #ifdef CONFIG_DASD_EER 579 int dasd_eer_init(void); 580 void dasd_eer_exit(void); 581 int dasd_eer_enable(struct dasd_device *); 582 void dasd_eer_disable(struct dasd_device *); 583 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 584 unsigned int id); 585 void dasd_eer_snss(struct dasd_device *); 586 587 static inline int dasd_eer_enabled(struct dasd_device *device) 588 { 589 return device->eer_cqr != NULL; 590 } 591 #else 592 #define dasd_eer_init() (0) 593 #define dasd_eer_exit() do { } while (0) 594 #define dasd_eer_enable(d) (0) 595 #define dasd_eer_disable(d) do { } while (0) 596 #define dasd_eer_write(d,c,i) do { } while (0) 597 #define dasd_eer_snss(d) do { } while (0) 598 #define dasd_eer_enabled(d) (0) 599 #endif /* CONFIG_DASD_ERR */ 600 601 #endif /* __KERNEL__ */ 602 603 #endif /* DASD_H */ 604