drivers/s390/block/dasd_int.h

   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 int dasd_generic_read_dev_chars(struct dasd_device *, char *, void **, int);
 513
 514 /* externals in dasd_devmap.c */
 515 extern int dasd_max_devindex;
 516 extern int dasd_probeonly;
 517 extern int dasd_autodetect;
 518 extern int dasd_nopav;
 519
 520 int dasd_devmap_init(void);
 521 void dasd_devmap_exit(void);
 522
 523 struct dasd_device *dasd_create_device(struct ccw_device *);
 524 void dasd_delete_device(struct dasd_device *);
 525
 526 int dasd_get_uid(struct ccw_device *, struct dasd_uid *);
 527 int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
 528 int dasd_get_feature(struct ccw_device *, int);
 529 int dasd_set_feature(struct ccw_device *, int, int);
 530
 531 int dasd_add_sysfs_files(struct ccw_device *);
 532 void dasd_remove_sysfs_files(struct ccw_device *);
 533
 534 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 535 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 536 struct dasd_device *dasd_device_from_devindex(int);
 537
 538 int dasd_parse(void);
 539 int dasd_busid_known(char *);
 540
 541 /* externals in dasd_gendisk.c */
 542 int  dasd_gendisk_init(void);
 543 void dasd_gendisk_exit(void);
 544 int dasd_gendisk_alloc(struct dasd_device *);
 545 void dasd_gendisk_free(struct dasd_device *);
 546 int dasd_scan_partitions(struct dasd_device *);
 547 void dasd_destroy_partitions(struct dasd_device *);
 548
 549 /* externals in dasd_ioctl.c */
 550 int  dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
 551 long dasd_compat_ioctl(struct file *, unsigned int, unsigned long);
 552
 553 /* externals in dasd_proc.c */
 554 int dasd_proc_init(void);
 555 void dasd_proc_exit(void);
 556
 557 /* externals in dasd_erp.c */
 558 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 559 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 560 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 561                                             struct dasd_device *);
 562 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 563 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 564
 565 /* externals in dasd_3370_erp.c */
 566 dasd_era_t dasd_3370_erp_examine(struct dasd_ccw_req *, struct irb *);
 567
 568 /* externals in dasd_3990_erp.c */
 569 dasd_era_t dasd_3990_erp_examine(struct dasd_ccw_req *, struct irb *);
 570 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 571
 572 /* externals in dasd_9336_erp.c */
 573 dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *);
 574
 575 /* externals in dasd_9336_erp.c */
 576 dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *);
 577 struct dasd_ccw_req *dasd_9343_erp_action(struct dasd_ccw_req *);
 578
 579 /* externals in dasd_eer.c */
 580 #ifdef CONFIG_DASD_EER
 581 int dasd_eer_init(void);
 582 void dasd_eer_exit(void);
 583 int dasd_eer_enable(struct dasd_device *);
 584 void dasd_eer_disable(struct dasd_device *);
 585 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 586                     unsigned int id);
 587 void dasd_eer_snss(struct dasd_device *);
 588
 589 static inline int dasd_eer_enabled(struct dasd_device *device)
 590 {
 591         return device->eer_cqr != NULL;
 592 }
 593 #else
 594 #define dasd_eer_init()         (0)
 595 #define dasd_eer_exit()         do { } while (0)
 596 #define dasd_eer_enable(d)      (0)
 597 #define dasd_eer_disable(d)     do { } while (0)
 598 #define dasd_eer_write(d,c,i)   do { } while (0)
 599 #define dasd_eer_snss(d)        do { } while (0)
 600 #define dasd_eer_enabled(d)     (0)
 601 #endif  /* CONFIG_DASD_ERR */
 602
 603 #endif                          /* __KERNEL__ */
 604
 605 #endif                          /* DASD_H */