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