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  * Copyright IBM Corp. 1999, 2009
   8  */
   9
  10 #ifndef DASD_INT_H
  11 #define DASD_INT_H
  12
  13 #ifdef __KERNEL__
  14
  15 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
  16 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
  17 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
  18
  19 /*
  20  * States a dasd device can have:
  21  *   new: the dasd_device structure is allocated.
  22  *   known: the discipline for the device is identified.
  23  *   basic: the device can do basic i/o.
  24  *   unfmt: the device could not be analyzed (format is unknown).
  25  *   ready: partition detection is done and the device is can do block io.
  26  *   online: the device accepts requests from the block device queue.
  27  *
  28  * Things to do for startup state transitions:
  29  *   new -> known: find discipline for the device and create devfs entries.
  30  *   known -> basic: request irq line for the device.
  31  *   basic -> ready: do the initial analysis, e.g. format detection,
  32  *                   do block device setup and detect partitions.
  33  *   ready -> online: schedule the device tasklet.
  34  * Things to do for shutdown state transitions:
  35  *   online -> ready: just set the new device state.
  36  *   ready -> basic: flush requests from the block device layer, clear
  37  *                   partition information and reset format information.
  38  *   basic -> known: terminate all requests and free irq.
  39  *   known -> new: remove devfs entries and forget discipline.
  40  */
  41
  42 #define DASD_STATE_NEW    0
  43 #define DASD_STATE_KNOWN  1
  44 #define DASD_STATE_BASIC  2
  45 #define DASD_STATE_UNFMT  3
  46 #define DASD_STATE_READY  4
  47 #define DASD_STATE_ONLINE 5
  48
  49 #include <linux/module.h>
  50 #include <linux/wait.h>
  51 #include <linux/blkdev.h>
  52 #include <linux/genhd.h>
  53 #include <linux/hdreg.h>
  54 #include <linux/interrupt.h>
  55 #include <linux/log2.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 /* DASD discipline magic */
  63 #define DASD_ECKD_MAGIC 0xC5C3D2C4
  64 #define DASD_DIAG_MAGIC 0xC4C9C1C7
  65 #define DASD_FBA_MAGIC 0xC6C2C140
  66
  67 /*
  68  * SECTION: Type definitions
  69  */
  70 struct dasd_device;
  71 struct dasd_block;
  72
  73 /* BIT DEFINITIONS FOR SENSE DATA */
  74 #define DASD_SENSE_BIT_0 0x80
  75 #define DASD_SENSE_BIT_1 0x40
  76 #define DASD_SENSE_BIT_2 0x20
  77 #define DASD_SENSE_BIT_3 0x10
  78
  79 /* BIT DEFINITIONS FOR SIM SENSE */
  80 #define DASD_SIM_SENSE 0x0F
  81 #define DASD_SIM_MSG_TO_OP 0x03
  82 #define DASD_SIM_LOG 0x0C
  83
  84 /*
  85  * SECTION: MACROs for klogd and s390 debug feature (dbf)
  86  */
  87 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
  88 do { \
  89         debug_sprintf_event(d_device->debug_area, \
  90                             d_level, \
  91                             d_str "\n", \
  92                             d_data); \
  93 } while(0)
  94
  95 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
  96 do { \
  97         debug_sprintf_exception(d_device->debug_area, \
  98                                 d_level, \
  99                                 d_str "\n", \
 100                                 d_data); \
 101 } while(0)
 102
 103 #define DBF_EVENT(d_level, d_str, d_data...)\
 104 do { \
 105         debug_sprintf_event(dasd_debug_area, \
 106                             d_level,\
 107                             d_str "\n", \
 108                             d_data); \
 109 } while(0)
 110
 111 #define DBF_EXC(d_level, d_str, d_data...)\
 112 do { \
 113         debug_sprintf_exception(dasd_debug_area, \
 114                                 d_level,\
 115                                 d_str "\n", \
 116                                 d_data); \
 117 } while(0)
 118
 119 /* limit size for an errorstring */
 120 #define ERRORLENGTH 30
 121
 122 /* definition of dbf debug levels */
 123 #define DBF_EMERG       0       /* system is unusable                   */
 124 #define DBF_ALERT       1       /* action must be taken immediately     */
 125 #define DBF_CRIT        2       /* critical conditions                  */
 126 #define DBF_ERR         3       /* error conditions                     */
 127 #define DBF_WARNING     4       /* warning conditions                   */
 128 #define DBF_NOTICE      5       /* normal but significant condition     */
 129 #define DBF_INFO        6       /* informational                        */
 130 #define DBF_DEBUG       6       /* debug-level messages                 */
 131
 132 /* messages to be written via klogd and dbf */
 133 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
 134 do { \
 135         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 136                dev_name(&d_device->cdev->dev), d_args); \
 137         DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
 138 } while(0)
 139
 140 #define MESSAGE(d_loglevel,d_string,d_args...)\
 141 do { \
 142         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 143         DBF_EVENT(DBF_ALERT, d_string, d_args); \
 144 } while(0)
 145
 146 /* messages to be written via klogd only */
 147 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
 148 do { \
 149         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 150                dev_name(&d_device->cdev->dev), d_args); \
 151 } while(0)
 152
 153 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
 154 do { \
 155         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 156 } while(0)
 157
 158 struct dasd_ccw_req {
 159         unsigned int magic;             /* Eye catcher */
 160         struct list_head devlist;       /* for dasd_device request queue */
 161         struct list_head blocklist;     /* for dasd_block request queue */
 162
 163         /* Where to execute what... */
 164         struct dasd_block *block;       /* the originating block device */
 165         struct dasd_device *memdev;     /* the device used to allocate this */
 166         struct dasd_device *startdev;   /* device the request is started on */
 167         void *cpaddr;                   /* address of ccw or tcw */
 168         unsigned char cpmode;           /* 0 = cmd mode, 1 = itcw */
 169         char status;                    /* status of this request */
 170         short retries;                  /* A retry counter */
 171         unsigned long flags;            /* flags of this request */
 172
 173         /* ... and how */
 174         unsigned long starttime;        /* jiffies time of request start */
 175         int expires;                    /* expiration period in jiffies */
 176         char lpm;                       /* logical path mask */
 177         void *data;                     /* pointer to data area */
 178
 179         /* these are important for recovering erroneous requests          */
 180         int intrc;                      /* internal error, e.g. from start_IO */
 181         struct irb irb;                 /* device status in case of an error */
 182         struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
 183         void *function;                 /* originating ERP action */
 184
 185         /* these are for statistics only */
 186         unsigned long long buildclk;    /* TOD-clock of request generation */
 187         unsigned long long startclk;    /* TOD-clock of request start */
 188         unsigned long long stopclk;     /* TOD-clock of request interrupt */
 189         unsigned long long endclk;      /* TOD-clock of request termination */
 190
 191         /* Callback that is called after reaching final status. */
 192         void (*callback)(struct dasd_ccw_req *, void *data);
 193         void *callback_data;
 194 };
 195
 196 /*
 197  * dasd_ccw_req -> status can be:
 198  */
 199 #define DASD_CQR_FILLED         0x00    /* request is ready to be processed */
 200 #define DASD_CQR_DONE           0x01    /* request is completed successfully */
 201 #define DASD_CQR_NEED_ERP       0x02    /* request needs recovery action */
 202 #define DASD_CQR_IN_ERP         0x03    /* request is in recovery */
 203 #define DASD_CQR_FAILED         0x04    /* request is finally failed */
 204 #define DASD_CQR_TERMINATED     0x05    /* request was stopped by driver */
 205
 206 #define DASD_CQR_QUEUED         0x80    /* request is queued to be processed */
 207 #define DASD_CQR_IN_IO          0x81    /* request is currently in IO */
 208 #define DASD_CQR_ERROR          0x82    /* request is completed with error */
 209 #define DASD_CQR_CLEAR_PENDING  0x83    /* request is clear pending */
 210 #define DASD_CQR_CLEARED        0x84    /* request was cleared */
 211 #define DASD_CQR_SUCCESS        0x85    /* request was successful */
 212
 213
 214 /* per dasd_ccw_req flags */
 215 #define DASD_CQR_FLAGS_USE_ERP   0      /* use ERP for this request */
 216 #define DASD_CQR_FLAGS_FAILFAST  1      /* FAILFAST */
 217
 218 /* Signature for error recovery functions. */
 219 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
 220
 221 /*
 222  * the struct dasd_discipline is
 223  * sth like a table of virtual functions, if you think of dasd_eckd
 224  * inheriting dasd...
 225  * no, currently we are not planning to reimplement the driver in C++
 226  */
 227 struct dasd_discipline {
 228         struct module *owner;
 229         char ebcname[8];        /* a name used for tagging and printks */
 230         char name[8];           /* a name used for tagging and printks */
 231         int max_blocks;         /* maximum number of blocks to be chained */
 232
 233         struct list_head list;  /* used for list of disciplines */
 234
 235         /*
 236          * Device recognition functions. check_device is used to verify
 237          * the sense data and the information returned by read device
 238          * characteristics. It returns 0 if the discipline can be used
 239          * for the device in question. uncheck_device is called during
 240          * device shutdown to deregister a device from its discipline.
 241          */
 242         int (*check_device) (struct dasd_device *);
 243         void (*uncheck_device) (struct dasd_device *);
 244
 245         /*
 246          * do_analysis is used in the step from device state "basic" to
 247          * state "accept". It returns 0 if the device can be made ready,
 248          * it returns -EMEDIUMTYPE if the device can't be made ready or
 249          * -EAGAIN if do_analysis started a ccw that needs to complete
 250          * before the analysis may be repeated.
 251          */
 252         int (*do_analysis) (struct dasd_block *);
 253
 254         /*
 255          * Last things to do when a device is set online, and first things
 256          * when it is set offline.
 257          */
 258         int (*ready_to_online) (struct dasd_device *);
 259         int (*online_to_ready) (struct dasd_device *);
 260
 261         /*
 262          * Device operation functions. build_cp creates a ccw chain for
 263          * a block device request, start_io starts the request and
 264          * term_IO cancels it (e.g. in case of a timeout). format_device
 265          * returns a ccw chain to be used to format the device.
 266          * handle_terminated_request allows to examine a cqr and prepare
 267          * it for retry.
 268          */
 269         struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
 270                                           struct dasd_block *,
 271                                           struct request *);
 272         int (*start_IO) (struct dasd_ccw_req *);
 273         int (*term_IO) (struct dasd_ccw_req *);
 274         void (*handle_terminated_request) (struct dasd_ccw_req *);
 275         struct dasd_ccw_req *(*format_device) (struct dasd_device *,
 276                                                struct format_data_t *);
 277         int (*free_cp) (struct dasd_ccw_req *, struct request *);
 278
 279         /*
 280          * Error recovery functions. examine_error() returns a value that
 281          * indicates what to do for an error condition. If examine_error()
 282          * returns 'dasd_era_recover' erp_action() is called to create a
 283          * special error recovery ccw. erp_postaction() is called after
 284          * an error recovery ccw has finished its execution. dump_sense
 285          * is called for every error condition to print the sense data
 286          * to the console.
 287          */
 288         dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
 289         dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
 290         void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
 291                             struct irb *);
 292         void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
 293
 294         void (*handle_unsolicited_interrupt) (struct dasd_device *,
 295                                               struct irb *);
 296
 297         /* i/o control functions. */
 298         int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
 299         int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 300         int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
 301
 302         /* suspend/resume functions */
 303         int (*freeze) (struct dasd_device *);
 304         int (*restore) (struct dasd_device *);
 305 };
 306
 307 extern struct dasd_discipline *dasd_diag_discipline_pointer;
 308
 309 /*
 310  * Unique identifier for dasd device.
 311  */
 312 #define UA_NOT_CONFIGURED  0x00
 313 #define UA_BASE_DEVICE     0x01
 314 #define UA_BASE_PAV_ALIAS  0x02
 315 #define UA_HYPER_PAV_ALIAS 0x03
 316
 317 struct dasd_uid {
 318         __u8 type;
 319         char vendor[4];
 320         char serial[15];
 321         __u16 ssid;
 322         __u8 real_unit_addr;
 323         __u8 base_unit_addr;
 324         char vduit[33];
 325 };
 326
 327 /*
 328  * Notification numbers for extended error reporting notifications:
 329  * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
 330  * eer pointer) is freed. The error reporting module needs to do all necessary
 331  * cleanup steps.
 332  * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
 333  */
 334 #define DASD_EER_DISABLE 0
 335 #define DASD_EER_TRIGGER 1
 336
 337 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
 338 #define DASD_EER_FATALERROR  1
 339 #define DASD_EER_NOPATH      2
 340 #define DASD_EER_STATECHANGE 3
 341 #define DASD_EER_PPRCSUSPEND 4
 342
 343 struct dasd_device {
 344         /* Block device stuff. */
 345         struct dasd_block *block;
 346
 347         unsigned int devindex;
 348         unsigned long flags;       /* per device flags */
 349         unsigned short features;   /* copy of devmap-features (read-only!) */
 350
 351         /* extended error reporting stuff (eer) */
 352         struct dasd_ccw_req *eer_cqr;
 353
 354         /* Device discipline stuff. */
 355         struct dasd_discipline *discipline;
 356         struct dasd_discipline *base_discipline;
 357         char *private;
 358
 359         /* Device state and target state. */
 360         int state, target;
 361         int stopped;            /* device (ccw_device_start) was stopped */
 362
 363         /* reference count. */
 364         atomic_t ref_count;
 365
 366         /* ccw queue and memory for static ccw/erp buffers. */
 367         struct list_head ccw_queue;
 368         spinlock_t mem_lock;
 369         void *ccw_mem;
 370         void *erp_mem;
 371         struct list_head ccw_chunks;
 372         struct list_head erp_chunks;
 373
 374         atomic_t tasklet_scheduled;
 375         struct tasklet_struct tasklet;
 376         struct work_struct kick_work;
 377         struct work_struct restore_device;
 378         struct timer_list timer;
 379
 380         debug_info_t *debug_area;
 381
 382         struct ccw_device *cdev;
 383
 384         /* hook for alias management */
 385         struct list_head alias_list;
 386 };
 387
 388 struct dasd_block {
 389         /* Block device stuff. */
 390         struct gendisk *gdp;
 391         struct request_queue *request_queue;
 392         spinlock_t request_queue_lock;
 393         struct block_device *bdev;
 394         atomic_t open_count;
 395
 396         unsigned long long blocks; /* size of volume in blocks */
 397         unsigned int bp_block;     /* bytes per block */
 398         unsigned int s2b_shift;    /* log2 (bp_block/512) */
 399
 400         struct dasd_device *base;
 401         struct list_head ccw_queue;
 402         spinlock_t queue_lock;
 403
 404         atomic_t tasklet_scheduled;
 405         struct tasklet_struct tasklet;
 406         struct timer_list timer;
 407
 408 #ifdef CONFIG_DASD_PROFILE
 409         struct dasd_profile_info_t profile;
 410 #endif
 411 };
 412
 413
 414
 415 /* reasons why device (ccw_device_start) was stopped */
 416 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 417 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 418 #define DASD_STOPPED_PENDING 4         /* long busy */
 419 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 420 #define DASD_STOPPED_SU      16        /* summary unit check handling */
 421 #define DASD_STOPPED_PM      32        /* pm state transition */
 422 #define DASD_UNRESUMED_PM    64        /* pm resume failed state */
 423
 424 /* per device flags */
 425 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 426 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 427 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 428
 429 void dasd_put_device_wake(struct dasd_device *);
 430
 431 /*
 432  * Reference count inliners
 433  */
 434 static inline void
 435 dasd_get_device(struct dasd_device *device)
 436 {
 437         atomic_inc(&device->ref_count);
 438 }
 439
 440 static inline void
 441 dasd_put_device(struct dasd_device *device)
 442 {
 443         if (atomic_dec_return(&device->ref_count) == 0)
 444                 dasd_put_device_wake(device);
 445 }
 446
 447 /*
 448  * The static memory in ccw_mem and erp_mem is managed by a sorted
 449  * list of free memory chunks.
 450  */
 451 struct dasd_mchunk
 452 {
 453         struct list_head list;
 454         unsigned long size;
 455 } __attribute__ ((aligned(8)));
 456
 457 static inline void
 458 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 459                     unsigned long size)
 460 {
 461         struct dasd_mchunk *chunk;
 462
 463         INIT_LIST_HEAD(chunk_list);
 464         chunk = (struct dasd_mchunk *) mem;
 465         chunk->size = size - sizeof(struct dasd_mchunk);
 466         list_add(&chunk->list, chunk_list);
 467 }
 468
 469 static inline void *
 470 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 471 {
 472         struct dasd_mchunk *chunk, *tmp;
 473
 474         size = (size + 7L) & -8L;
 475         list_for_each_entry(chunk, chunk_list, list) {
 476                 if (chunk->size < size)
 477                         continue;
 478                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 479                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 480                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 481                         tmp->size = size;
 482                         chunk->size -= size + sizeof(struct dasd_mchunk);
 483                         chunk = tmp;
 484                 } else
 485                         list_del(&chunk->list);
 486                 return (void *) (chunk + 1);
 487         }
 488         return NULL;
 489 }
 490
 491 static inline void
 492 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 493 {
 494         struct dasd_mchunk *chunk, *tmp;
 495         struct list_head *p, *left;
 496
 497         chunk = (struct dasd_mchunk *)
 498                 ((char *) mem - sizeof(struct dasd_mchunk));
 499         /* Find out the left neighbour in chunk_list. */
 500         left = chunk_list;
 501         list_for_each(p, chunk_list) {
 502                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 503                         break;
 504                 left = p;
 505         }
 506         /* Try to merge with right neighbour = next element from left. */
 507         if (left->next != chunk_list) {
 508                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 509                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 510                         list_del(&tmp->list);
 511                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 512                 }
 513         }
 514         /* Try to merge with left neighbour. */
 515         if (left != chunk_list) {
 516                 tmp = list_entry(left, struct dasd_mchunk, list);
 517                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 518                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 519                         return;
 520                 }
 521         }
 522         __list_add(&chunk->list, left, left->next);
 523 }
 524
 525 /*
 526  * Check if bsize is in { 512, 1024, 2048, 4096 }
 527  */
 528 static inline int
 529 dasd_check_blocksize(int bsize)
 530 {
 531         if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 532                 return -EMEDIUMTYPE;
 533         return 0;
 534 }
 535
 536 /* externals in dasd.c */
 537 #define DASD_PROFILE_ON  1
 538 #define DASD_PROFILE_OFF 0
 539
 540 extern debug_info_t *dasd_debug_area;
 541 extern struct dasd_profile_info_t dasd_global_profile;
 542 extern unsigned int dasd_profile_level;
 543 extern const struct block_device_operations dasd_device_operations;
 544
 545 extern struct kmem_cache *dasd_page_cache;
 546
 547 struct dasd_ccw_req *
 548 dasd_kmalloc_request(int , int, int, struct dasd_device *);
 549 struct dasd_ccw_req *
 550 dasd_smalloc_request(int , int, int, struct dasd_device *);
 551 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 552 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 553
 554 static inline int
 555 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
 556 {
 557         return set_normalized_cda(ccw, cda);
 558 }
 559
 560 struct dasd_device *dasd_alloc_device(void);
 561 void dasd_free_device(struct dasd_device *);
 562
 563 struct dasd_block *dasd_alloc_block(void);
 564 void dasd_free_block(struct dasd_block *);
 565
 566 void dasd_enable_device(struct dasd_device *);
 567 void dasd_set_target_state(struct dasd_device *, int);
 568 void dasd_kick_device(struct dasd_device *);
 569 void dasd_restore_device(struct dasd_device *);
 570
 571 void dasd_add_request_head(struct dasd_ccw_req *);
 572 void dasd_add_request_tail(struct dasd_ccw_req *);
 573 int  dasd_start_IO(struct dasd_ccw_req *);
 574 int  dasd_term_IO(struct dasd_ccw_req *);
 575 void dasd_schedule_device_bh(struct dasd_device *);
 576 void dasd_schedule_block_bh(struct dasd_block *);
 577 int  dasd_sleep_on(struct dasd_ccw_req *);
 578 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 579 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 580 void dasd_device_set_timer(struct dasd_device *, int);
 581 void dasd_device_clear_timer(struct dasd_device *);
 582 void dasd_block_set_timer(struct dasd_block *, int);
 583 void dasd_block_clear_timer(struct dasd_block *);
 584 int  dasd_cancel_req(struct dasd_ccw_req *);
 585 int dasd_flush_device_queue(struct dasd_device *);
 586 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 587 void dasd_generic_remove (struct ccw_device *cdev);
 588 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 589 int dasd_generic_set_offline (struct ccw_device *cdev);
 590 int dasd_generic_notify(struct ccw_device *, int);
 591 void dasd_generic_handle_state_change(struct dasd_device *);
 592 int dasd_generic_pm_freeze(struct ccw_device *);
 593 int dasd_generic_restore_device(struct ccw_device *);
 594
 595 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
 596 char *dasd_get_sense(struct irb *);
 597
 598 /* externals in dasd_devmap.c */
 599 extern int dasd_max_devindex;
 600 extern int dasd_probeonly;
 601 extern int dasd_autodetect;
 602 extern int dasd_nopav;
 603 extern int dasd_nofcx;
 604
 605 int dasd_devmap_init(void);
 606 void dasd_devmap_exit(void);
 607
 608 struct dasd_device *dasd_create_device(struct ccw_device *);
 609 void dasd_delete_device(struct dasd_device *);
 610
 611 int dasd_get_uid(struct ccw_device *, struct dasd_uid *);
 612 int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
 613 int dasd_get_feature(struct ccw_device *, int);
 614 int dasd_set_feature(struct ccw_device *, int, int);
 615
 616 int dasd_add_sysfs_files(struct ccw_device *);
 617 void dasd_remove_sysfs_files(struct ccw_device *);
 618
 619 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 620 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 621 struct dasd_device *dasd_device_from_devindex(int);
 622
 623 int dasd_parse(void);
 624 int dasd_busid_known(const char *);
 625
 626 /* externals in dasd_gendisk.c */
 627 int  dasd_gendisk_init(void);
 628 void dasd_gendisk_exit(void);
 629 int dasd_gendisk_alloc(struct dasd_block *);
 630 void dasd_gendisk_free(struct dasd_block *);
 631 int dasd_scan_partitions(struct dasd_block *);
 632 void dasd_destroy_partitions(struct dasd_block *);
 633
 634 /* externals in dasd_ioctl.c */
 635 int  dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
 636
 637 /* externals in dasd_proc.c */
 638 int dasd_proc_init(void);
 639 void dasd_proc_exit(void);
 640
 641 /* externals in dasd_erp.c */
 642 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 643 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 644 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 645                                             struct dasd_device *);
 646 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 647 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 648 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
 649
 650 /* externals in dasd_3990_erp.c */
 651 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 652 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
 653
 654 /* externals in dasd_eer.c */
 655 #ifdef CONFIG_DASD_EER
 656 int dasd_eer_init(void);
 657 void dasd_eer_exit(void);
 658 int dasd_eer_enable(struct dasd_device *);
 659 void dasd_eer_disable(struct dasd_device *);
 660 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 661                     unsigned int id);
 662 void dasd_eer_snss(struct dasd_device *);
 663
 664 static inline int dasd_eer_enabled(struct dasd_device *device)
 665 {
 666         return device->eer_cqr != NULL;
 667 }
 668 #else
 669 #define dasd_eer_init()         (0)
 670 #define dasd_eer_exit()         do { } while (0)
 671 #define dasd_eer_enable(d)      (0)
 672 #define dasd_eer_disable(d)     do { } while (0)
 673 #define dasd_eer_write(d,c,i)   do { } while (0)
 674 #define dasd_eer_snss(d)        do { } while (0)
 675 #define dasd_eer_enabled(d)     (0)
 676 #endif  /* CONFIG_DASD_ERR */
 677
 678 #endif                          /* __KERNEL__ */
 679
 680 #endif                          /* DASD_H */