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 <linux/log2.h> 57 #include <asm/ccwdev.h> 58 #include <linux/workqueue.h> 59 #include <asm/debug.h> 60 #include <asm/dasd.h> 61 #include <asm/idals.h> 62 63 /* 64 * SECTION: Type definitions 65 */ 66 struct dasd_device; 67 68 typedef enum { 69 dasd_era_fatal = -1, /* no chance to recover */ 70 dasd_era_none = 0, /* don't recover, everything alright */ 71 dasd_era_msg = 1, /* don't recover, just report... */ 72 dasd_era_recover = 2 /* recovery action recommended */ 73 } dasd_era_t; 74 75 /* BIT DEFINITIONS FOR SENSE DATA */ 76 #define DASD_SENSE_BIT_0 0x80 77 #define DASD_SENSE_BIT_1 0x40 78 #define DASD_SENSE_BIT_2 0x20 79 #define DASD_SENSE_BIT_3 0x10 80 81 /* 82 * SECTION: MACROs for klogd and s390 debug feature (dbf) 83 */ 84 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ 85 do { \ 86 debug_sprintf_event(d_device->debug_area, \ 87 d_level, \ 88 d_str "\n", \ 89 d_data); \ 90 } while(0) 91 92 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \ 93 do { \ 94 debug_sprintf_exception(d_device->debug_area, \ 95 d_level, \ 96 d_str "\n", \ 97 d_data); \ 98 } while(0) 99 100 #define DBF_EVENT(d_level, d_str, d_data...)\ 101 do { \ 102 debug_sprintf_event(dasd_debug_area, \ 103 d_level,\ 104 d_str "\n", \ 105 d_data); \ 106 } while(0) 107 108 #define DBF_EXC(d_level, d_str, d_data...)\ 109 do { \ 110 debug_sprintf_exception(dasd_debug_area, \ 111 d_level,\ 112 d_str "\n", \ 113 d_data); \ 114 } while(0) 115 116 /* definition of dbf debug levels */ 117 #define DBF_EMERG 0 /* system is unusable */ 118 #define DBF_ALERT 1 /* action must be taken immediately */ 119 #define DBF_CRIT 2 /* critical conditions */ 120 #define DBF_ERR 3 /* error conditions */ 121 #define DBF_WARNING 4 /* warning conditions */ 122 #define DBF_NOTICE 5 /* normal but significant condition */ 123 #define DBF_INFO 6 /* informational */ 124 #define DBF_DEBUG 6 /* debug-level messages */ 125 126 /* messages to be written via klogd and dbf */ 127 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ 128 do { \ 129 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 130 d_device->cdev->dev.bus_id, d_args); \ 131 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ 132 } while(0) 133 134 #define MESSAGE(d_loglevel,d_string,d_args...)\ 135 do { \ 136 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 137 DBF_EVENT(DBF_ALERT, d_string, d_args); \ 138 } while(0) 139 140 /* messages to be written via klogd only */ 141 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ 142 do { \ 143 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 144 d_device->cdev->dev.bus_id, d_args); \ 145 } while(0) 146 147 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ 148 do { \ 149 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 150 } while(0) 151 152 struct dasd_ccw_req { 153 unsigned int magic; /* Eye catcher */ 154 struct list_head list; /* list_head for request queueing. */ 155 156 /* Where to execute what... */ 157 struct dasd_device *device; /* device the request is for */ 158 struct ccw1 *cpaddr; /* address of channel program */ 159 char status; /* status of this request */ 160 short retries; /* A retry counter */ 161 unsigned long flags; /* flags of this request */ 162 163 /* ... and how */ 164 unsigned long starttime; /* jiffies time of request start */ 165 int expires; /* expiration period in jiffies */ 166 char lpm; /* logical path mask */ 167 void *data; /* pointer to data area */ 168 169 /* these are important for recovering erroneous requests */ 170 struct irb irb; /* device status in case of an error */ 171 struct dasd_ccw_req *refers; /* ERP-chain queueing. */ 172 void *function; /* originating ERP action */ 173 174 /* these are for statistics only */ 175 unsigned long long buildclk; /* TOD-clock of request generation */ 176 unsigned long long startclk; /* TOD-clock of request start */ 177 unsigned long long stopclk; /* TOD-clock of request interrupt */ 178 unsigned long long endclk; /* TOD-clock of request termination */ 179 180 /* Callback that is called after reaching final status. */ 181 void (*callback)(struct dasd_ccw_req *, void *data); 182 void *callback_data; 183 }; 184 185 /* 186 * dasd_ccw_req -> status can be: 187 */ 188 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ 189 #define DASD_CQR_QUEUED 0x01 /* request is queued to be processed */ 190 #define DASD_CQR_IN_IO 0x02 /* request is currently in IO */ 191 #define DASD_CQR_DONE 0x03 /* request is completed successfully */ 192 #define DASD_CQR_ERROR 0x04 /* request is completed with error */ 193 #define DASD_CQR_FAILED 0x05 /* request is finally failed */ 194 #define DASD_CQR_CLEAR 0x06 /* request is clear pending */ 195 196 /* per dasd_ccw_req flags */ 197 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ 198 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ 199 200 /* Signature for error recovery functions. */ 201 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 202 203 /* 204 * the struct dasd_discipline is 205 * sth like a table of virtual functions, if you think of dasd_eckd 206 * inheriting dasd... 207 * no, currently we are not planning to reimplement the driver in C++ 208 */ 209 struct dasd_discipline { 210 struct module *owner; 211 char ebcname[8]; /* a name used for tagging and printks */ 212 char name[8]; /* a name used for tagging and printks */ 213 int max_blocks; /* maximum number of blocks to be chained */ 214 215 struct list_head list; /* used for list of disciplines */ 216 217 /* 218 * Device recognition functions. check_device is used to verify 219 * the sense data and the information returned by read device 220 * characteristics. It returns 0 if the discipline can be used 221 * for the device in question. 222 * do_analysis is used in the step from device state "basic" to 223 * state "accept". It returns 0 if the device can be made ready, 224 * it returns -EMEDIUMTYPE if the device can't be made ready or 225 * -EAGAIN if do_analysis started a ccw that needs to complete 226 * before the analysis may be repeated. 227 */ 228 int (*check_device)(struct dasd_device *); 229 int (*do_analysis) (struct dasd_device *); 230 231 /* 232 * Device operation functions. build_cp creates a ccw chain for 233 * a block device request, start_io starts the request and 234 * term_IO cancels it (e.g. in case of a timeout). format_device 235 * returns a ccw chain to be used to format the device. 236 */ 237 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 238 struct request *); 239 int (*start_IO) (struct dasd_ccw_req *); 240 int (*term_IO) (struct dasd_ccw_req *); 241 struct dasd_ccw_req *(*format_device) (struct dasd_device *, 242 struct format_data_t *); 243 int (*free_cp) (struct dasd_ccw_req *, struct request *); 244 /* 245 * Error recovery functions. examine_error() returns a value that 246 * indicates what to do for an error condition. If examine_error() 247 * returns 'dasd_era_recover' erp_action() is called to create a 248 * special error recovery ccw. erp_postaction() is called after 249 * an error recovery ccw has finished its execution. dump_sense 250 * is called for every error condition to print the sense data 251 * to the console. 252 */ 253 dasd_era_t(*examine_error) (struct dasd_ccw_req *, struct irb *); 254 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 255 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 256 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 257 struct irb *); 258 259 /* i/o control functions. */ 260 int (*fill_geometry) (struct dasd_device *, struct hd_geometry *); 261 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 262 int (*ioctl) (struct dasd_device *, unsigned int, void __user *); 263 }; 264 265 extern struct dasd_discipline *dasd_diag_discipline_pointer; 266 267 /* 268 * Unique identifier for dasd device. 269 */ 270 struct dasd_uid { 271 __u8 alias; 272 char vendor[4]; 273 char serial[15]; 274 __u16 ssid; 275 __u8 unit_addr; 276 }; 277 278 /* 279 * Notification numbers for extended error reporting notifications: 280 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 281 * eer pointer) is freed. The error reporting module needs to do all necessary 282 * cleanup steps. 283 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 284 */ 285 #define DASD_EER_DISABLE 0 286 #define DASD_EER_TRIGGER 1 287 288 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 289 #define DASD_EER_FATALERROR 1 290 #define DASD_EER_NOPATH 2 291 #define DASD_EER_STATECHANGE 3 292 #define DASD_EER_PPRCSUSPEND 4 293 294 struct dasd_device { 295 /* Block device stuff. */ 296 struct gendisk *gdp; 297 struct request_queue *request_queue; 298 spinlock_t request_queue_lock; 299 struct block_device *bdev; 300 unsigned int devindex; 301 unsigned long blocks; /* size of volume in blocks */ 302 unsigned int bp_block; /* bytes per block */ 303 unsigned int s2b_shift; /* log2 (bp_block/512) */ 304 unsigned long flags; /* per device flags */ 305 unsigned short features; /* copy of devmap-features (read-only!) */ 306 307 /* extended error reporting stuff (eer) */ 308 struct dasd_ccw_req *eer_cqr; 309 310 /* Device discipline stuff. */ 311 struct dasd_discipline *discipline; 312 struct dasd_discipline *base_discipline; 313 char *private; 314 315 /* Device state and target state. */ 316 int state, target; 317 int stopped; /* device (ccw_device_start) was stopped */ 318 319 /* Open and reference count. */ 320 atomic_t ref_count; 321 atomic_t open_count; 322 323 /* ccw queue and memory for static ccw/erp buffers. */ 324 struct list_head ccw_queue; 325 spinlock_t mem_lock; 326 void *ccw_mem; 327 void *erp_mem; 328 struct list_head ccw_chunks; 329 struct list_head erp_chunks; 330 331 atomic_t tasklet_scheduled; 332 struct tasklet_struct tasklet; 333 struct work_struct kick_work; 334 struct timer_list timer; 335 336 debug_info_t *debug_area; 337 338 struct ccw_device *cdev; 339 340 #ifdef CONFIG_DASD_PROFILE 341 struct dasd_profile_info_t profile; 342 #endif 343 }; 344 345 /* reasons why device (ccw_device_start) was stopped */ 346 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 347 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 348 #define DASD_STOPPED_PENDING 4 /* long busy */ 349 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 350 #define DASD_STOPPED_DC_EIO 16 /* disconnected, return -EIO */ 351 352 /* per device flags */ 353 #define DASD_FLAG_DSC_ERROR 2 /* return -EIO when disconnected */ 354 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 355 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 356 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 357 358 void dasd_put_device_wake(struct dasd_device *); 359 360 /* 361 * Reference count inliners 362 */ 363 static inline void 364 dasd_get_device(struct dasd_device *device) 365 { 366 atomic_inc(&device->ref_count); 367 } 368 369 static inline void 370 dasd_put_device(struct dasd_device *device) 371 { 372 if (atomic_dec_return(&device->ref_count) == 0) 373 dasd_put_device_wake(device); 374 } 375 376 /* 377 * The static memory in ccw_mem and erp_mem is managed by a sorted 378 * list of free memory chunks. 379 */ 380 struct dasd_mchunk 381 { 382 struct list_head list; 383 unsigned long size; 384 } __attribute__ ((aligned(8))); 385 386 static inline void 387 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 388 unsigned long size) 389 { 390 struct dasd_mchunk *chunk; 391 392 INIT_LIST_HEAD(chunk_list); 393 chunk = (struct dasd_mchunk *) mem; 394 chunk->size = size - sizeof(struct dasd_mchunk); 395 list_add(&chunk->list, chunk_list); 396 } 397 398 static inline void * 399 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 400 { 401 struct dasd_mchunk *chunk, *tmp; 402 403 size = (size + 7L) & -8L; 404 list_for_each_entry(chunk, chunk_list, list) { 405 if (chunk->size < size) 406 continue; 407 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 408 char *endaddr = (char *) (chunk + 1) + chunk->size; 409 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 410 tmp->size = size; 411 chunk->size -= size + sizeof(struct dasd_mchunk); 412 chunk = tmp; 413 } else 414 list_del(&chunk->list); 415 return (void *) (chunk + 1); 416 } 417 return NULL; 418 } 419 420 static inline void 421 dasd_free_chunk(struct list_head *chunk_list, void *mem) 422 { 423 struct dasd_mchunk *chunk, *tmp; 424 struct list_head *p, *left; 425 426 chunk = (struct dasd_mchunk *) 427 ((char *) mem - sizeof(struct dasd_mchunk)); 428 /* Find out the left neighbour in chunk_list. */ 429 left = chunk_list; 430 list_for_each(p, chunk_list) { 431 if (list_entry(p, struct dasd_mchunk, list) > chunk) 432 break; 433 left = p; 434 } 435 /* Try to merge with right neighbour = next element from left. */ 436 if (left->next != chunk_list) { 437 tmp = list_entry(left->next, struct dasd_mchunk, list); 438 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 439 list_del(&tmp->list); 440 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 441 } 442 } 443 /* Try to merge with left neighbour. */ 444 if (left != chunk_list) { 445 tmp = list_entry(left, struct dasd_mchunk, list); 446 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 447 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 448 return; 449 } 450 } 451 __list_add(&chunk->list, left, left->next); 452 } 453 454 /* 455 * Check if bsize is in { 512, 1024, 2048, 4096 } 456 */ 457 static inline int 458 dasd_check_blocksize(int bsize) 459 { 460 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 461 return -EMEDIUMTYPE; 462 return 0; 463 } 464 465 /* externals in dasd.c */ 466 #define DASD_PROFILE_ON 1 467 #define DASD_PROFILE_OFF 0 468 469 extern debug_info_t *dasd_debug_area; 470 extern struct dasd_profile_info_t dasd_global_profile; 471 extern unsigned int dasd_profile_level; 472 extern struct block_device_operations dasd_device_operations; 473 474 extern struct kmem_cache *dasd_page_cache; 475 476 struct dasd_ccw_req * 477 dasd_kmalloc_request(char *, int, int, struct dasd_device *); 478 struct dasd_ccw_req * 479 dasd_smalloc_request(char *, int, int, struct dasd_device *); 480 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 481 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 482 483 static inline int 484 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 485 { 486 return set_normalized_cda(ccw, cda); 487 } 488 489 struct dasd_device *dasd_alloc_device(void); 490 void dasd_free_device(struct dasd_device *); 491 492 void dasd_enable_device(struct dasd_device *); 493 void dasd_set_target_state(struct dasd_device *, int); 494 void dasd_kick_device(struct dasd_device *); 495 496 void dasd_add_request_head(struct dasd_ccw_req *); 497 void dasd_add_request_tail(struct dasd_ccw_req *); 498 int dasd_start_IO(struct dasd_ccw_req *); 499 int dasd_term_IO(struct dasd_ccw_req *); 500 void dasd_schedule_bh(struct dasd_device *); 501 int dasd_sleep_on(struct dasd_ccw_req *); 502 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 503 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 504 void dasd_set_timer(struct dasd_device *, int); 505 void dasd_clear_timer(struct dasd_device *); 506 int dasd_cancel_req(struct dasd_ccw_req *); 507 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 508 void dasd_generic_remove (struct ccw_device *cdev); 509 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 510 int dasd_generic_set_offline (struct ccw_device *cdev); 511 int dasd_generic_notify(struct ccw_device *, int); 512 513 int dasd_generic_read_dev_chars(struct dasd_device *, char *, void **, int); 514 515 /* externals in dasd_devmap.c */ 516 extern int dasd_max_devindex; 517 extern int dasd_probeonly; 518 extern int dasd_autodetect; 519 extern int dasd_nopav; 520 521 int dasd_devmap_init(void); 522 void dasd_devmap_exit(void); 523 524 struct dasd_device *dasd_create_device(struct ccw_device *); 525 void dasd_delete_device(struct dasd_device *); 526 527 int dasd_get_uid(struct ccw_device *, struct dasd_uid *); 528 int dasd_set_uid(struct ccw_device *, struct dasd_uid *); 529 int dasd_get_feature(struct ccw_device *, int); 530 int dasd_set_feature(struct ccw_device *, int, int); 531 532 int dasd_add_sysfs_files(struct ccw_device *); 533 void dasd_remove_sysfs_files(struct ccw_device *); 534 535 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 536 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 537 struct dasd_device *dasd_device_from_devindex(int); 538 539 int dasd_parse(void); 540 int dasd_busid_known(char *); 541 542 /* externals in dasd_gendisk.c */ 543 int dasd_gendisk_init(void); 544 void dasd_gendisk_exit(void); 545 int dasd_gendisk_alloc(struct dasd_device *); 546 void dasd_gendisk_free(struct dasd_device *); 547 int dasd_scan_partitions(struct dasd_device *); 548 void dasd_destroy_partitions(struct dasd_device *); 549 550 /* externals in dasd_ioctl.c */ 551 int dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long); 552 long dasd_compat_ioctl(struct file *, unsigned int, unsigned long); 553 554 /* externals in dasd_proc.c */ 555 int dasd_proc_init(void); 556 void dasd_proc_exit(void); 557 558 /* externals in dasd_erp.c */ 559 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 560 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 561 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 562 struct dasd_device *); 563 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 564 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 565 566 /* externals in dasd_3370_erp.c */ 567 dasd_era_t dasd_3370_erp_examine(struct dasd_ccw_req *, struct irb *); 568 569 /* externals in dasd_3990_erp.c */ 570 dasd_era_t dasd_3990_erp_examine(struct dasd_ccw_req *, struct irb *); 571 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 572 573 /* externals in dasd_9336_erp.c */ 574 dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *); 575 576 /* externals in dasd_9336_erp.c */ 577 dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *); 578 struct dasd_ccw_req *dasd_9343_erp_action(struct dasd_ccw_req *); 579 580 /* externals in dasd_eer.c */ 581 #ifdef CONFIG_DASD_EER 582 int dasd_eer_init(void); 583 void dasd_eer_exit(void); 584 int dasd_eer_enable(struct dasd_device *); 585 void dasd_eer_disable(struct dasd_device *); 586 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 587 unsigned int id); 588 void dasd_eer_snss(struct dasd_device *); 589 590 static inline int dasd_eer_enabled(struct dasd_device *device) 591 { 592 return device->eer_cqr != NULL; 593 } 594 #else 595 #define dasd_eer_init() (0) 596 #define dasd_eer_exit() do { } while (0) 597 #define dasd_eer_enable(d) (0) 598 #define dasd_eer_disable(d) do { } while (0) 599 #define dasd_eer_write(d,c,i) do { } while (0) 600 #define dasd_eer_snss(d) do { } while (0) 601 #define dasd_eer_enabled(d) (0) 602 #endif /* CONFIG_DASD_ERR */ 603 604 #endif /* __KERNEL__ */ 605 606 #endif /* DASD_H */ 607