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 /* erp debugging in dasd.c and dasd_3990_erp.c */
  17 #define ERP_DEBUG
  18
  19
  20 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
  21 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
  22 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
  23
  24 /*
  25  * States a dasd device can have:
  26  *   new: the dasd_device structure is allocated.
  27  *   known: the discipline for the device is identified.
  28  *   basic: the device can do basic i/o.
  29  *   unfmt: the device could not be analyzed (format is unknown).
  30  *   ready: partition detection is done and the device is can do block io.
  31  *   online: the device accepts requests from the block device queue.
  32  *
  33  * Things to do for startup state transitions:
  34  *   new -> known: find discipline for the device and create devfs entries.
  35  *   known -> basic: request irq line for the device.
  36  *   basic -> ready: do the initial analysis, e.g. format detection,
  37  *                   do block device setup and detect partitions.
  38  *   ready -> online: schedule the device tasklet.
  39  * Things to do for shutdown state transitions:
  40  *   online -> ready: just set the new device state.
  41  *   ready -> basic: flush requests from the block device layer, clear
  42  *                   partition information and reset format information.
  43  *   basic -> known: terminate all requests and free irq.
  44  *   known -> new: remove devfs entries and forget discipline.
  45  */
  46
  47 #define DASD_STATE_NEW    0
  48 #define DASD_STATE_KNOWN  1
  49 #define DASD_STATE_BASIC  2
  50 #define DASD_STATE_UNFMT  3
  51 #define DASD_STATE_READY  4
  52 #define DASD_STATE_ONLINE 5
  53
  54 #include <linux/module.h>
  55 #include <linux/wait.h>
  56 #include <linux/blkdev.h>
  57 #include <linux/devfs_fs_kernel.h>
  58 #include <linux/genhd.h>
  59 #include <linux/hdreg.h>
  60 #include <linux/interrupt.h>
  61 #include <asm/ccwdev.h>
  62 #include <linux/workqueue.h>
  63 #include <asm/debug.h>
  64 #include <asm/dasd.h>
  65 #include <asm/idals.h>
  66
  67 /*
  68  * SECTION: Type definitions
  69  */
  70 struct dasd_device;
  71
  72 typedef enum {
  73         dasd_era_fatal = -1,    /* no chance to recover              */
  74         dasd_era_none = 0,      /* don't recover, everything alright */
  75         dasd_era_msg = 1,       /* don't recover, just report...     */
  76         dasd_era_recover = 2    /* recovery action recommended       */
  77 } dasd_era_t;
  78
  79 /* BIT DEFINITIONS FOR SENSE DATA */
  80 #define DASD_SENSE_BIT_0 0x80
  81 #define DASD_SENSE_BIT_1 0x40
  82 #define DASD_SENSE_BIT_2 0x20
  83 #define DASD_SENSE_BIT_3 0x10
  84
  85 /*
  86  * SECTION: MACROs for klogd and s390 debug feature (dbf)
  87  */
  88 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
  89 do { \
  90         debug_sprintf_event(d_device->debug_area, \
  91                             d_level, \
  92                             d_str "\n", \
  93                             d_data); \
  94 } while(0)
  95
  96 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
  97 do { \
  98         debug_sprintf_exception(d_device->debug_area, \
  99                                 d_level, \
 100                                 d_str "\n", \
 101                                 d_data); \
 102 } while(0)
 103
 104 #define DBF_EVENT(d_level, d_str, d_data...)\
 105 do { \
 106         debug_sprintf_event(dasd_debug_area, \
 107                             d_level,\
 108                             d_str "\n", \
 109                             d_data); \
 110 } while(0)
 111
 112 #define DBF_EXC(d_level, d_str, d_data...)\
 113 do { \
 114         debug_sprintf_exception(dasd_debug_area, \
 115                                 d_level,\
 116                                 d_str "\n", \
 117                                 d_data); \
 118 } while(0)
 119
 120 /* definition of dbf debug levels */
 121 #define DBF_EMERG       0       /* system is unusable                   */
 122 #define DBF_ALERT       1       /* action must be taken immediately     */
 123 #define DBF_CRIT        2       /* critical conditions                  */
 124 #define DBF_ERR         3       /* error conditions                     */
 125 #define DBF_WARNING     4       /* warning conditions                   */
 126 #define DBF_NOTICE      5       /* normal but significant condition     */
 127 #define DBF_INFO        6       /* informational                        */
 128 #define DBF_DEBUG       6       /* debug-level messages                 */
 129
 130 /* messages to be written via klogd and dbf */
 131 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
 132 do { \
 133         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 134                d_device->cdev->dev.bus_id, d_args); \
 135         DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
 136 } while(0)
 137
 138 #define MESSAGE(d_loglevel,d_string,d_args...)\
 139 do { \
 140         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 141         DBF_EVENT(DBF_ALERT, d_string, d_args); \
 142 } while(0)
 143
 144 /* messages to be written via klogd only */
 145 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
 146 do { \
 147         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 148                d_device->cdev->dev.bus_id, d_args); \
 149 } while(0)
 150
 151 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
 152 do { \
 153         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 154 } while(0)
 155
 156 struct dasd_ccw_req {
 157         unsigned int magic;             /* Eye catcher */
 158         struct list_head list;          /* list_head for request queueing. */
 159
 160         /* Where to execute what... */
 161         struct dasd_device *device;     /* device the request is for */
 162         struct ccw1 *cpaddr;            /* address of channel program */
 163         char status;                    /* status of this request */
 164         short retries;                  /* A retry counter */
 165         unsigned long flags;            /* flags of this request */
 166
 167         /* ... and how */
 168         unsigned long starttime;        /* jiffies time of request start */
 169         int expires;                    /* expiration period in jiffies */
 170         char lpm;                       /* logical path mask */
 171         void *data;                     /* pointer to data area */
 172
 173         /* these are important for recovering erroneous requests          */
 174         struct irb irb;                 /* device status in case of an error */
 175         struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
 176         void *function;                 /* originating ERP action */
 177
 178         /* these are for statistics only */
 179         unsigned long long buildclk;    /* TOD-clock of request generation */
 180         unsigned long long startclk;    /* TOD-clock of request start */
 181         unsigned long long stopclk;     /* TOD-clock of request interrupt */
 182         unsigned long long endclk;      /* TOD-clock of request termination */
 183
 184         /* Callback that is called after reaching final status. */
 185         void (*callback)(struct dasd_ccw_req *, void *data);
 186         void *callback_data;
 187 };
 188
 189 /*
 190  * dasd_ccw_req -> status can be:
 191  */
 192 #define DASD_CQR_FILLED   0x00  /* request is ready to be processed */
 193 #define DASD_CQR_QUEUED   0x01  /* request is queued to be processed */
 194 #define DASD_CQR_IN_IO    0x02  /* request is currently in IO */
 195 #define DASD_CQR_DONE     0x03  /* request is completed successfully */
 196 #define DASD_CQR_ERROR    0x04  /* request is completed with error */
 197 #define DASD_CQR_FAILED   0x05  /* request is finally failed */
 198 #define DASD_CQR_CLEAR    0x06  /* request is clear pending */
 199
 200 /* per dasd_ccw_req flags */
 201 #define DASD_CQR_FLAGS_USE_ERP   0      /* use ERP for this request */
 202 #define DASD_CQR_FLAGS_FAILFAST  1      /* FAILFAST */
 203
 204 /* Signature for error recovery functions. */
 205 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
 206
 207 /*
 208  * the struct dasd_discipline is
 209  * sth like a table of virtual functions, if you think of dasd_eckd
 210  * inheriting dasd...
 211  * no, currently we are not planning to reimplement the driver in C++
 212  */
 213 struct dasd_discipline {
 214         struct module *owner;
 215         char ebcname[8];        /* a name used for tagging and printks */
 216         char name[8];           /* a name used for tagging and printks */
 217         int max_blocks;         /* maximum number of blocks to be chained */
 218
 219         struct list_head list;  /* used for list of disciplines */
 220
 221         /*
 222          * Device recognition functions. check_device is used to verify
 223          * the sense data and the information returned by read device
 224          * characteristics. It returns 0 if the discipline can be used
 225          * for the device in question.
 226          * do_analysis is used in the step from device state "basic" to
 227          * state "accept". It returns 0 if the device can be made ready,
 228          * it returns -EMEDIUMTYPE if the device can't be made ready or
 229          * -EAGAIN if do_analysis started a ccw that needs to complete
 230          * before the analysis may be repeated.
 231          */
 232         int (*check_device)(struct dasd_device *);
 233         int (*do_analysis) (struct dasd_device *);
 234
 235         /*
 236          * Device operation functions. build_cp creates a ccw chain for
 237          * a block device request, start_io starts the request and
 238          * term_IO cancels it (e.g. in case of a timeout). format_device
 239          * returns a ccw chain to be used to format the device.
 240          */
 241         struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
 242                                           struct request *);
 243         int (*start_IO) (struct dasd_ccw_req *);
 244         int (*term_IO) (struct dasd_ccw_req *);
 245         struct dasd_ccw_req *(*format_device) (struct dasd_device *,
 246                                                struct format_data_t *);
 247         int (*free_cp) (struct dasd_ccw_req *, struct request *);
 248         /*
 249          * Error recovery functions. examine_error() returns a value that
 250          * indicates what to do for an error condition. If examine_error()
 251          * returns 'dasd_era_recover' erp_action() is called to create a
 252          * special error recovery ccw. erp_postaction() is called after
 253          * an error recovery ccw has finished its execution. dump_sense
 254          * is called for every error condition to print the sense data
 255          * to the console.
 256          */
 257         dasd_era_t(*examine_error) (struct dasd_ccw_req *, struct irb *);
 258         dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
 259         dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
 260         void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
 261                             struct irb *);
 262
 263         /* i/o control functions. */
 264         int (*fill_geometry) (struct dasd_device *, struct hd_geometry *);
 265         int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 266         int (*ioctl) (struct dasd_device *, unsigned int, void __user *);
 267 };
 268
 269 extern struct dasd_discipline *dasd_diag_discipline_pointer;
 270
 271 /*
 272  * Unique identifier for dasd device.
 273  */
 274 struct dasd_uid {
 275         __u8 alias;
 276         char vendor[4];
 277         char serial[15];
 278         __u16 ssid;
 279         __u8 unit_addr;
 280 };
 281
 282 /*
 283  * Notification numbers for extended error reporting notifications:
 284  * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
 285  * eer pointer) is freed. The error reporting module needs to do all necessary
 286  * cleanup steps.
 287  * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
 288  */
 289 #define DASD_EER_DISABLE 0
 290 #define DASD_EER_TRIGGER 1
 291
 292 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
 293 #define DASD_EER_FATALERROR  1
 294 #define DASD_EER_NOPATH      2
 295 #define DASD_EER_STATECHANGE 3
 296 #define DASD_EER_PPRCSUSPEND 4
 297
 298 struct dasd_device {
 299         /* Block device stuff. */
 300         struct gendisk *gdp;
 301         request_queue_t *request_queue;
 302         spinlock_t request_queue_lock;
 303         struct block_device *bdev;
 304         unsigned int devindex;
 305         unsigned long blocks;           /* size of volume in blocks */
 306         unsigned int bp_block;          /* bytes per block */
 307         unsigned int s2b_shift;         /* log2 (bp_block/512) */
 308         unsigned long flags;            /* per device flags */
 309         unsigned short features;        /* copy of devmap-features (read-only!) */
 310
 311         /* extended error reporting stuff (eer) */
 312         struct dasd_ccw_req *eer_cqr;
 313
 314         /* Device discipline stuff. */
 315         struct dasd_discipline *discipline;
 316         struct dasd_discipline *base_discipline;
 317         char *private;
 318
 319         /* Device state and target state. */
 320         int state, target;
 321         int stopped;            /* device (ccw_device_start) was stopped */
 322
 323         /* Open and reference count. */
 324         atomic_t ref_count;
 325         atomic_t open_count;
 326
 327         /* ccw queue and memory for static ccw/erp buffers. */
 328         struct list_head ccw_queue;
 329         spinlock_t mem_lock;
 330         void *ccw_mem;
 331         void *erp_mem;
 332         struct list_head ccw_chunks;
 333         struct list_head erp_chunks;
 334
 335         atomic_t tasklet_scheduled;
 336         struct tasklet_struct tasklet;
 337         struct work_struct kick_work;
 338         struct timer_list timer;
 339
 340         debug_info_t *debug_area;
 341
 342         struct ccw_device *cdev;
 343
 344 #ifdef CONFIG_DASD_PROFILE
 345         struct dasd_profile_info_t profile;
 346 #endif
 347 };
 348
 349 /* reasons why device (ccw_device_start) was stopped */
 350 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 351 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 352 #define DASD_STOPPED_PENDING 4         /* long busy */
 353 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 354 #define DASD_STOPPED_DC_EIO  16        /* disconnected, return -EIO */
 355
 356 /* per device flags */
 357 #define DASD_FLAG_DSC_ERROR     2       /* return -EIO when disconnected */
 358 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 359 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 360 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 361
 362 void dasd_put_device_wake(struct dasd_device *);
 363
 364 /*
 365  * Reference count inliners
 366  */
 367 static inline void
 368 dasd_get_device(struct dasd_device *device)
 369 {
 370         atomic_inc(&device->ref_count);
 371 }
 372
 373 static inline void
 374 dasd_put_device(struct dasd_device *device)
 375 {
 376         if (atomic_dec_return(&device->ref_count) == 0)
 377                 dasd_put_device_wake(device);
 378 }
 379
 380 /*
 381  * The static memory in ccw_mem and erp_mem is managed by a sorted
 382  * list of free memory chunks.
 383  */
 384 struct dasd_mchunk
 385 {
 386         struct list_head list;
 387         unsigned long size;
 388 } __attribute__ ((aligned(8)));
 389
 390 static inline void
 391 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 392                     unsigned long size)
 393 {
 394         struct dasd_mchunk *chunk;
 395
 396         INIT_LIST_HEAD(chunk_list);
 397         chunk = (struct dasd_mchunk *) mem;
 398         chunk->size = size - sizeof(struct dasd_mchunk);
 399         list_add(&chunk->list, chunk_list);
 400 }
 401
 402 static inline void *
 403 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 404 {
 405         struct dasd_mchunk *chunk, *tmp;
 406
 407         size = (size + 7L) & -8L;
 408         list_for_each_entry(chunk, chunk_list, list) {
 409                 if (chunk->size < size)
 410                         continue;
 411                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 412                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 413                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 414                         tmp->size = size;
 415                         chunk->size -= size + sizeof(struct dasd_mchunk);
 416                         chunk = tmp;
 417                 } else
 418                         list_del(&chunk->list);
 419                 return (void *) (chunk + 1);
 420         }
 421         return NULL;
 422 }
 423
 424 static inline void
 425 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 426 {
 427         struct dasd_mchunk *chunk, *tmp;
 428         struct list_head *p, *left;
 429
 430         chunk = (struct dasd_mchunk *)
 431                 ((char *) mem - sizeof(struct dasd_mchunk));
 432         /* Find out the left neighbour in chunk_list. */
 433         left = chunk_list;
 434         list_for_each(p, chunk_list) {
 435                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 436                         break;
 437                 left = p;
 438         }
 439         /* Try to merge with right neighbour = next element from left. */
 440         if (left->next != chunk_list) {
 441                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 442                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 443                         list_del(&tmp->list);
 444                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 445                 }
 446         }
 447         /* Try to merge with left neighbour. */
 448         if (left != chunk_list) {
 449                 tmp = list_entry(left, struct dasd_mchunk, list);
 450                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 451                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 452                         return;
 453                 }
 454         }
 455         __list_add(&chunk->list, left, left->next);
 456 }
 457
 458 /*
 459  * Check if bsize is in { 512, 1024, 2048, 4096 }
 460  */
 461 static inline int
 462 dasd_check_blocksize(int bsize)
 463 {
 464         if (bsize < 512 || bsize > 4096 || (bsize & (bsize - 1)) != 0)
 465                 return -EMEDIUMTYPE;
 466         return 0;
 467 }
 468
 469 /* externals in dasd.c */
 470 #define DASD_PROFILE_ON  1
 471 #define DASD_PROFILE_OFF 0
 472
 473 extern debug_info_t *dasd_debug_area;
 474 extern struct dasd_profile_info_t dasd_global_profile;
 475 extern unsigned int dasd_profile_level;
 476 extern struct block_device_operations dasd_device_operations;
 477
 478 extern kmem_cache_t *dasd_page_cache;
 479
 480 struct dasd_ccw_req *
 481 dasd_kmalloc_request(char *, int, int, struct dasd_device *);
 482 struct dasd_ccw_req *
 483 dasd_smalloc_request(char *, int, int, struct dasd_device *);
 484 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 485 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 486
 487 static inline int
 488 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
 489 {
 490         return set_normalized_cda(ccw, cda);
 491 }
 492
 493 struct dasd_device *dasd_alloc_device(void);
 494 void dasd_free_device(struct dasd_device *);
 495
 496 void dasd_enable_device(struct dasd_device *);
 497 void dasd_set_target_state(struct dasd_device *, int);
 498 void dasd_kick_device(struct dasd_device *);
 499
 500 void dasd_add_request_head(struct dasd_ccw_req *);
 501 void dasd_add_request_tail(struct dasd_ccw_req *);
 502 int  dasd_start_IO(struct dasd_ccw_req *);
 503 int  dasd_term_IO(struct dasd_ccw_req *);
 504 void dasd_schedule_bh(struct dasd_device *);
 505 int  dasd_sleep_on(struct dasd_ccw_req *);
 506 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 507 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 508 void dasd_set_timer(struct dasd_device *, int);
 509 void dasd_clear_timer(struct dasd_device *);
 510 int  dasd_cancel_req(struct dasd_ccw_req *);
 511 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 512 void dasd_generic_remove (struct ccw_device *cdev);
 513 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 514 int dasd_generic_set_offline (struct ccw_device *cdev);
 515 int dasd_generic_notify(struct ccw_device *, int);
 516 void dasd_generic_auto_online (struct ccw_driver *);
 517
 518 /* externals in dasd_devmap.c */
 519 extern int dasd_max_devindex;
 520 extern int dasd_probeonly;
 521 extern int dasd_autodetect;
 522
 523 int dasd_devmap_init(void);
 524 void dasd_devmap_exit(void);
 525
 526 struct dasd_device *dasd_create_device(struct ccw_device *);
 527 void dasd_delete_device(struct dasd_device *);
 528
 529 int dasd_get_uid(struct ccw_device *, struct dasd_uid *);
 530 int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
 531 int dasd_get_feature(struct ccw_device *, int);
 532 int dasd_set_feature(struct ccw_device *, int, int);
 533
 534 int dasd_add_sysfs_files(struct ccw_device *);
 535 void dasd_remove_sysfs_files(struct ccw_device *);
 536
 537 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 538 struct dasd_device *dasd_device_from_devindex(int);
 539
 540 int dasd_parse(void);
 541 int dasd_busid_known(char *);
 542
 543 /* externals in dasd_gendisk.c */
 544 int  dasd_gendisk_init(void);
 545 void dasd_gendisk_exit(void);
 546 int dasd_gendisk_alloc(struct dasd_device *);
 547 void dasd_gendisk_free(struct dasd_device *);
 548 int dasd_scan_partitions(struct dasd_device *);
 549 void dasd_destroy_partitions(struct dasd_device *);
 550
 551 /* externals in dasd_ioctl.c */
 552 int  dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
 553 long dasd_compat_ioctl(struct file *, unsigned int, unsigned long);
 554
 555 /* externals in dasd_proc.c */
 556 int dasd_proc_init(void);
 557 void dasd_proc_exit(void);
 558
 559 /* externals in dasd_erp.c */
 560 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 561 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 562 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 563                                             struct dasd_device *);
 564 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 565 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 566 void dasd_log_ccw(struct dasd_ccw_req *, int, __u32);
 567
 568 /* externals in dasd_3370_erp.c */
 569 dasd_era_t dasd_3370_erp_examine(struct dasd_ccw_req *, struct irb *);
 570
 571 /* externals in dasd_3990_erp.c */
 572 dasd_era_t dasd_3990_erp_examine(struct dasd_ccw_req *, struct irb *);
 573 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 574
 575 /* externals in dasd_9336_erp.c */
 576 dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *);
 577
 578 /* externals in dasd_9336_erp.c */
 579 dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *);
 580 struct dasd_ccw_req *dasd_9343_erp_action(struct dasd_ccw_req *);
 581
 582 /* externals in dasd_eer.c */
 583 #ifdef CONFIG_DASD_EER
 584 int dasd_eer_init(void);
 585 void dasd_eer_exit(void);
 586 int dasd_eer_enable(struct dasd_device *);
 587 void dasd_eer_disable(struct dasd_device *);
 588 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 589                     unsigned int id);
 590 void dasd_eer_snss(struct dasd_device *);
 591
 592 static inline int dasd_eer_enabled(struct dasd_device *device)
 593 {
 594         return device->eer_cqr != NULL;
 595 }
 596 #else
 597 #define dasd_eer_init()         (0)
 598 #define dasd_eer_exit()         do { } while (0)
 599 #define dasd_eer_enable(d)      (0)
 600 #define dasd_eer_disable(d)     do { } while (0)
 601 #define dasd_eer_write(d,c,i)   do { } while (0)
 602 #define dasd_eer_snss(d)        do { } while (0)
 603 #define dasd_eer_enabled(d)     (0)
 604 #endif  /* CONFIG_DASD_ERR */
 605
 606 #endif                          /* __KERNEL__ */
 607
 608 #endif                          /* DASD_H */
 609
 610 /*
 611  * Overrides for Emacs so that we follow Linus's tabbing style.
 612  * Emacs will notice this stuff at the end of the file and automatically
 613  * adjust the settings for this buffer only.  This must remain at the end
 614  * of the file.
 615  * ---------------------------------------------------------------------------
 616  * Local variables:
 617  * c-indent-level: 4
 618  * c-brace-imaginary-offset: 0
 619  * c-brace-offset: -4
 620  * c-argdecl-indent: 4
 621  * c-label-offset: -4
 622  * c-continued-statement-offset: 4
 623  * c-continued-brace-offset: 0
 624  * indent-tabs-mode: 1
 625  * tab-width: 8
 626  * End:
 627  */