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 <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 */