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_EVENT_DEVID(d_level, d_cdev, d_str, d_data...)      \
 112 do { \
 113         struct ccw_dev_id __dev_id;                     \
 114         ccw_device_get_id(d_cdev, &__dev_id);           \
 115         debug_sprintf_event(dasd_debug_area,            \
 116                             d_level,                                    \
 117                             "0.%x.%04x " d_str "\n",                    \
 118                             __dev_id.ssid, __dev_id.devno, d_data);     \
 119 } while (0)
 120
 121 #define DBF_EXC(d_level, d_str, d_data...)\
 122 do { \
 123         debug_sprintf_exception(dasd_debug_area, \
 124                                 d_level,\
 125                                 d_str "\n", \
 126                                 d_data); \
 127 } while(0)
 128
 129 /* limit size for an errorstring */
 130 #define ERRORLENGTH 30
 131
 132 /* definition of dbf debug levels */
 133 #define DBF_EMERG       0       /* system is unusable                   */
 134 #define DBF_ALERT       1       /* action must be taken immediately     */
 135 #define DBF_CRIT        2       /* critical conditions                  */
 136 #define DBF_ERR         3       /* error conditions                     */
 137 #define DBF_WARNING     4       /* warning conditions                   */
 138 #define DBF_NOTICE      5       /* normal but significant condition     */
 139 #define DBF_INFO        6       /* informational                        */
 140 #define DBF_DEBUG       6       /* debug-level messages                 */
 141
 142 /* messages to be written via klogd and dbf */
 143 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
 144 do { \
 145         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 146                dev_name(&d_device->cdev->dev), d_args); \
 147         DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
 148 } while(0)
 149
 150 #define MESSAGE(d_loglevel,d_string,d_args...)\
 151 do { \
 152         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 153         DBF_EVENT(DBF_ALERT, d_string, d_args); \
 154 } while(0)
 155
 156 /* messages to be written via klogd only */
 157 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
 158 do { \
 159         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 160                dev_name(&d_device->cdev->dev), d_args); \
 161 } while(0)
 162
 163 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
 164 do { \
 165         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 166 } while(0)
 167
 168 struct dasd_ccw_req {
 169         unsigned int magic;             /* Eye catcher */
 170         struct list_head devlist;       /* for dasd_device request queue */
 171         struct list_head blocklist;     /* for dasd_block request queue */
 172
 173         /* Where to execute what... */
 174         struct dasd_block *block;       /* the originating block device */
 175         struct dasd_device *memdev;     /* the device used to allocate this */
 176         struct dasd_device *startdev;   /* device the request is started on */
 177         void *cpaddr;                   /* address of ccw or tcw */
 178         unsigned char cpmode;           /* 0 = cmd mode, 1 = itcw */
 179         char status;                    /* status of this request */
 180         short retries;                  /* A retry counter */
 181         unsigned long flags;            /* flags of this request */
 182
 183         /* ... and how */
 184         unsigned long starttime;        /* jiffies time of request start */
 185         int expires;                    /* expiration period in jiffies */
 186         char lpm;                       /* logical path mask */
 187         void *data;                     /* pointer to data area */
 188
 189         /* these are important for recovering erroneous requests          */
 190         int intrc;                      /* internal error, e.g. from start_IO */
 191         struct irb irb;                 /* device status in case of an error */
 192         struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
 193         void *function;                 /* originating ERP action */
 194
 195         /* these are for statistics only */
 196         unsigned long long buildclk;    /* TOD-clock of request generation */
 197         unsigned long long startclk;    /* TOD-clock of request start */
 198         unsigned long long stopclk;     /* TOD-clock of request interrupt */
 199         unsigned long long endclk;      /* TOD-clock of request termination */
 200
 201         /* Callback that is called after reaching final status. */
 202         void (*callback)(struct dasd_ccw_req *, void *data);
 203         void *callback_data;
 204 };
 205
 206 /*
 207  * dasd_ccw_req -> status can be:
 208  */
 209 #define DASD_CQR_FILLED         0x00    /* request is ready to be processed */
 210 #define DASD_CQR_DONE           0x01    /* request is completed successfully */
 211 #define DASD_CQR_NEED_ERP       0x02    /* request needs recovery action */
 212 #define DASD_CQR_IN_ERP         0x03    /* request is in recovery */
 213 #define DASD_CQR_FAILED         0x04    /* request is finally failed */
 214 #define DASD_CQR_TERMINATED     0x05    /* request was stopped by driver */
 215
 216 #define DASD_CQR_QUEUED         0x80    /* request is queued to be processed */
 217 #define DASD_CQR_IN_IO          0x81    /* request is currently in IO */
 218 #define DASD_CQR_ERROR          0x82    /* request is completed with error */
 219 #define DASD_CQR_CLEAR_PENDING  0x83    /* request is clear pending */
 220 #define DASD_CQR_CLEARED        0x84    /* request was cleared */
 221 #define DASD_CQR_SUCCESS        0x85    /* request was successful */
 222
 223
 224 /* per dasd_ccw_req flags */
 225 #define DASD_CQR_FLAGS_USE_ERP   0      /* use ERP for this request */
 226 #define DASD_CQR_FLAGS_FAILFAST  1      /* FAILFAST */
 227
 228 /* Signature for error recovery functions. */
 229 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
 230
 231 /*
 232  * the struct dasd_discipline is
 233  * sth like a table of virtual functions, if you think of dasd_eckd
 234  * inheriting dasd...
 235  * no, currently we are not planning to reimplement the driver in C++
 236  */
 237 struct dasd_discipline {
 238         struct module *owner;
 239         char ebcname[8];        /* a name used for tagging and printks */
 240         char name[8];           /* a name used for tagging and printks */
 241         int max_blocks;         /* maximum number of blocks to be chained */
 242
 243         struct list_head list;  /* used for list of disciplines */
 244
 245         /*
 246          * Device recognition functions. check_device is used to verify
 247          * the sense data and the information returned by read device
 248          * characteristics. It returns 0 if the discipline can be used
 249          * for the device in question. uncheck_device is called during
 250          * device shutdown to deregister a device from its discipline.
 251          */
 252         int (*check_device) (struct dasd_device *);
 253         void (*uncheck_device) (struct dasd_device *);
 254
 255         /*
 256          * do_analysis is used in the step from device state "basic" to
 257          * state "accept". It returns 0 if the device can be made ready,
 258          * it returns -EMEDIUMTYPE if the device can't be made ready or
 259          * -EAGAIN if do_analysis started a ccw that needs to complete
 260          * before the analysis may be repeated.
 261          */
 262         int (*do_analysis) (struct dasd_block *);
 263
 264         /*
 265          * Last things to do when a device is set online, and first things
 266          * when it is set offline.
 267          */
 268         int (*ready_to_online) (struct dasd_device *);
 269         int (*online_to_ready) (struct dasd_device *);
 270
 271         /*
 272          * Device operation functions. build_cp creates a ccw chain for
 273          * a block device request, start_io starts the request and
 274          * term_IO cancels it (e.g. in case of a timeout). format_device
 275          * returns a ccw chain to be used to format the device.
 276          * handle_terminated_request allows to examine a cqr and prepare
 277          * it for retry.
 278          */
 279         struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
 280                                           struct dasd_block *,
 281                                           struct request *);
 282         int (*start_IO) (struct dasd_ccw_req *);
 283         int (*term_IO) (struct dasd_ccw_req *);
 284         void (*handle_terminated_request) (struct dasd_ccw_req *);
 285         struct dasd_ccw_req *(*format_device) (struct dasd_device *,
 286                                                struct format_data_t *);
 287         int (*free_cp) (struct dasd_ccw_req *, struct request *);
 288
 289         /*
 290          * Error recovery functions. examine_error() returns a value that
 291          * indicates what to do for an error condition. If examine_error()
 292          * returns 'dasd_era_recover' erp_action() is called to create a
 293          * special error recovery ccw. erp_postaction() is called after
 294          * an error recovery ccw has finished its execution. dump_sense
 295          * is called for every error condition to print the sense data
 296          * to the console.
 297          */
 298         dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
 299         dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
 300         void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
 301                             struct irb *);
 302         void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
 303
 304         void (*handle_unsolicited_interrupt) (struct dasd_device *,
 305                                               struct irb *);
 306
 307         /* i/o control functions. */
 308         int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
 309         int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 310         int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
 311
 312         /* suspend/resume functions */
 313         int (*freeze) (struct dasd_device *);
 314         int (*restore) (struct dasd_device *);
 315 };
 316
 317 extern struct dasd_discipline *dasd_diag_discipline_pointer;
 318
 319 /*
 320  * Unique identifier for dasd device.
 321  */
 322 #define UA_NOT_CONFIGURED  0x00
 323 #define UA_BASE_DEVICE     0x01
 324 #define UA_BASE_PAV_ALIAS  0x02
 325 #define UA_HYPER_PAV_ALIAS 0x03
 326
 327 struct dasd_uid {
 328         __u8 type;
 329         char vendor[4];
 330         char serial[15];
 331         __u16 ssid;
 332         __u8 real_unit_addr;
 333         __u8 base_unit_addr;
 334         char vduit[33];
 335 };
 336
 337 /*
 338  * Notification numbers for extended error reporting notifications:
 339  * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
 340  * eer pointer) is freed. The error reporting module needs to do all necessary
 341  * cleanup steps.
 342  * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
 343  */
 344 #define DASD_EER_DISABLE 0
 345 #define DASD_EER_TRIGGER 1
 346
 347 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
 348 #define DASD_EER_FATALERROR  1
 349 #define DASD_EER_NOPATH      2
 350 #define DASD_EER_STATECHANGE 3
 351 #define DASD_EER_PPRCSUSPEND 4
 352
 353 struct dasd_device {
 354         /* Block device stuff. */
 355         struct dasd_block *block;
 356
 357         unsigned int devindex;
 358         unsigned long flags;       /* per device flags */
 359         unsigned short features;   /* copy of devmap-features (read-only!) */
 360
 361         /* extended error reporting stuff (eer) */
 362         struct dasd_ccw_req *eer_cqr;
 363
 364         /* Device discipline stuff. */
 365         struct dasd_discipline *discipline;
 366         struct dasd_discipline *base_discipline;
 367         char *private;
 368
 369         /* Device state and target state. */
 370         int state, target;
 371         int stopped;            /* device (ccw_device_start) was stopped */
 372
 373         /* reference count. */
 374         atomic_t ref_count;
 375
 376         /* ccw queue and memory for static ccw/erp buffers. */
 377         struct list_head ccw_queue;
 378         spinlock_t mem_lock;
 379         void *ccw_mem;
 380         void *erp_mem;
 381         struct list_head ccw_chunks;
 382         struct list_head erp_chunks;
 383
 384         atomic_t tasklet_scheduled;
 385         struct tasklet_struct tasklet;
 386         struct work_struct kick_work;
 387         struct work_struct restore_device;
 388         struct timer_list timer;
 389
 390         debug_info_t *debug_area;
 391
 392         struct ccw_device *cdev;
 393
 394         /* hook for alias management */
 395         struct list_head alias_list;
 396 };
 397
 398 struct dasd_block {
 399         /* Block device stuff. */
 400         struct gendisk *gdp;
 401         struct request_queue *request_queue;
 402         spinlock_t request_queue_lock;
 403         struct block_device *bdev;
 404         atomic_t open_count;
 405
 406         unsigned long long blocks; /* size of volume in blocks */
 407         unsigned int bp_block;     /* bytes per block */
 408         unsigned int s2b_shift;    /* log2 (bp_block/512) */
 409
 410         struct dasd_device *base;
 411         struct list_head ccw_queue;
 412         spinlock_t queue_lock;
 413
 414         atomic_t tasklet_scheduled;
 415         struct tasklet_struct tasklet;
 416         struct timer_list timer;
 417
 418 #ifdef CONFIG_DASD_PROFILE
 419         struct dasd_profile_info_t profile;
 420 #endif
 421 };
 422
 423
 424
 425 /* reasons why device (ccw_device_start) was stopped */
 426 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 427 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 428 #define DASD_STOPPED_PENDING 4         /* long busy */
 429 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 430 #define DASD_STOPPED_SU      16        /* summary unit check handling */
 431 #define DASD_STOPPED_PM      32        /* pm state transition */
 432 #define DASD_UNRESUMED_PM    64        /* pm resume failed state */
 433
 434 /* per device flags */
 435 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 436 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 437 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 438
 439 void dasd_put_device_wake(struct dasd_device *);
 440
 441 /*
 442  * Reference count inliners
 443  */
 444 static inline void
 445 dasd_get_device(struct dasd_device *device)
 446 {
 447         atomic_inc(&device->ref_count);
 448 }
 449
 450 static inline void
 451 dasd_put_device(struct dasd_device *device)
 452 {
 453         if (atomic_dec_return(&device->ref_count) == 0)
 454                 dasd_put_device_wake(device);
 455 }
 456
 457 /*
 458  * The static memory in ccw_mem and erp_mem is managed by a sorted
 459  * list of free memory chunks.
 460  */
 461 struct dasd_mchunk
 462 {
 463         struct list_head list;
 464         unsigned long size;
 465 } __attribute__ ((aligned(8)));
 466
 467 static inline void
 468 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 469                     unsigned long size)
 470 {
 471         struct dasd_mchunk *chunk;
 472
 473         INIT_LIST_HEAD(chunk_list);
 474         chunk = (struct dasd_mchunk *) mem;
 475         chunk->size = size - sizeof(struct dasd_mchunk);
 476         list_add(&chunk->list, chunk_list);
 477 }
 478
 479 static inline void *
 480 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 481 {
 482         struct dasd_mchunk *chunk, *tmp;
 483
 484         size = (size + 7L) & -8L;
 485         list_for_each_entry(chunk, chunk_list, list) {
 486                 if (chunk->size < size)
 487                         continue;
 488                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 489                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 490                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 491                         tmp->size = size;
 492                         chunk->size -= size + sizeof(struct dasd_mchunk);
 493                         chunk = tmp;
 494                 } else
 495                         list_del(&chunk->list);
 496                 return (void *) (chunk + 1);
 497         }
 498         return NULL;
 499 }
 500
 501 static inline void
 502 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 503 {
 504         struct dasd_mchunk *chunk, *tmp;
 505         struct list_head *p, *left;
 506
 507         chunk = (struct dasd_mchunk *)
 508                 ((char *) mem - sizeof(struct dasd_mchunk));
 509         /* Find out the left neighbour in chunk_list. */
 510         left = chunk_list;
 511         list_for_each(p, chunk_list) {
 512                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 513                         break;
 514                 left = p;
 515         }
 516         /* Try to merge with right neighbour = next element from left. */
 517         if (left->next != chunk_list) {
 518                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 519                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 520                         list_del(&tmp->list);
 521                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 522                 }
 523         }
 524         /* Try to merge with left neighbour. */
 525         if (left != chunk_list) {
 526                 tmp = list_entry(left, struct dasd_mchunk, list);
 527                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 528                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 529                         return;
 530                 }
 531         }
 532         __list_add(&chunk->list, left, left->next);
 533 }
 534
 535 /*
 536  * Check if bsize is in { 512, 1024, 2048, 4096 }
 537  */
 538 static inline int
 539 dasd_check_blocksize(int bsize)
 540 {
 541         if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 542                 return -EMEDIUMTYPE;
 543         return 0;
 544 }
 545
 546 /* externals in dasd.c */
 547 #define DASD_PROFILE_ON  1
 548 #define DASD_PROFILE_OFF 0
 549
 550 extern debug_info_t *dasd_debug_area;
 551 extern struct dasd_profile_info_t dasd_global_profile;
 552 extern unsigned int dasd_profile_level;
 553 extern const struct block_device_operations dasd_device_operations;
 554
 555 extern struct kmem_cache *dasd_page_cache;
 556
 557 struct dasd_ccw_req *
 558 dasd_kmalloc_request(int , int, int, struct dasd_device *);
 559 struct dasd_ccw_req *
 560 dasd_smalloc_request(int , int, int, struct dasd_device *);
 561 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 562 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 563
 564 static inline int
 565 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
 566 {
 567         return set_normalized_cda(ccw, cda);
 568 }
 569
 570 struct dasd_device *dasd_alloc_device(void);
 571 void dasd_free_device(struct dasd_device *);
 572
 573 struct dasd_block *dasd_alloc_block(void);
 574 void dasd_free_block(struct dasd_block *);
 575
 576 void dasd_enable_device(struct dasd_device *);
 577 void dasd_set_target_state(struct dasd_device *, int);
 578 void dasd_kick_device(struct dasd_device *);
 579 void dasd_restore_device(struct dasd_device *);
 580
 581 void dasd_add_request_head(struct dasd_ccw_req *);
 582 void dasd_add_request_tail(struct dasd_ccw_req *);
 583 int  dasd_start_IO(struct dasd_ccw_req *);
 584 int  dasd_term_IO(struct dasd_ccw_req *);
 585 void dasd_schedule_device_bh(struct dasd_device *);
 586 void dasd_schedule_block_bh(struct dasd_block *);
 587 int  dasd_sleep_on(struct dasd_ccw_req *);
 588 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 589 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 590 void dasd_device_set_timer(struct dasd_device *, int);
 591 void dasd_device_clear_timer(struct dasd_device *);
 592 void dasd_block_set_timer(struct dasd_block *, int);
 593 void dasd_block_clear_timer(struct dasd_block *);
 594 int  dasd_cancel_req(struct dasd_ccw_req *);
 595 int dasd_flush_device_queue(struct dasd_device *);
 596 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 597 void dasd_generic_remove (struct ccw_device *cdev);
 598 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 599 int dasd_generic_set_offline (struct ccw_device *cdev);
 600 int dasd_generic_notify(struct ccw_device *, int);
 601 void dasd_generic_handle_state_change(struct dasd_device *);
 602 int dasd_generic_pm_freeze(struct ccw_device *);
 603 int dasd_generic_restore_device(struct ccw_device *);
 604
 605 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
 606 char *dasd_get_sense(struct irb *);
 607
 608 void dasd_device_set_stop_bits(struct dasd_device *, int);
 609 void dasd_device_remove_stop_bits(struct dasd_device *, int);
 610
 611 /* externals in dasd_devmap.c */
 612 extern int dasd_max_devindex;
 613 extern int dasd_probeonly;
 614 extern int dasd_autodetect;
 615 extern int dasd_nopav;
 616 extern int dasd_nofcx;
 617
 618 int dasd_devmap_init(void);
 619 void dasd_devmap_exit(void);
 620
 621 struct dasd_device *dasd_create_device(struct ccw_device *);
 622 void dasd_delete_device(struct dasd_device *);
 623
 624 int dasd_get_uid(struct ccw_device *, struct dasd_uid *);
 625 int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
 626 int dasd_get_feature(struct ccw_device *, int);
 627 int dasd_set_feature(struct ccw_device *, int, int);
 628
 629 int dasd_add_sysfs_files(struct ccw_device *);
 630 void dasd_remove_sysfs_files(struct ccw_device *);
 631
 632 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 633 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 634 struct dasd_device *dasd_device_from_devindex(int);
 635
 636 int dasd_parse(void);
 637 int dasd_busid_known(const char *);
 638
 639 /* externals in dasd_gendisk.c */
 640 int  dasd_gendisk_init(void);
 641 void dasd_gendisk_exit(void);
 642 int dasd_gendisk_alloc(struct dasd_block *);
 643 void dasd_gendisk_free(struct dasd_block *);
 644 int dasd_scan_partitions(struct dasd_block *);
 645 void dasd_destroy_partitions(struct dasd_block *);
 646
 647 /* externals in dasd_ioctl.c */
 648 int  dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
 649
 650 /* externals in dasd_proc.c */
 651 int dasd_proc_init(void);
 652 void dasd_proc_exit(void);
 653
 654 /* externals in dasd_erp.c */
 655 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 656 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 657 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 658                                             struct dasd_device *);
 659 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 660 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 661 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
 662
 663 /* externals in dasd_3990_erp.c */
 664 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 665 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
 666
 667 /* externals in dasd_eer.c */
 668 #ifdef CONFIG_DASD_EER
 669 int dasd_eer_init(void);
 670 void dasd_eer_exit(void);
 671 int dasd_eer_enable(struct dasd_device *);
 672 void dasd_eer_disable(struct dasd_device *);
 673 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 674                     unsigned int id);
 675 void dasd_eer_snss(struct dasd_device *);
 676
 677 static inline int dasd_eer_enabled(struct dasd_device *device)
 678 {
 679         return device->eer_cqr != NULL;
 680 }
 681 #else
 682 #define dasd_eer_init()         (0)
 683 #define dasd_eer_exit()         do { } while (0)
 684 #define dasd_eer_enable(d)      (0)
 685 #define dasd_eer_disable(d)     do { } while (0)
 686 #define dasd_eer_write(d,c,i)   do { } while (0)
 687 #define dasd_eer_snss(d)        do { } while (0)
 688 #define dasd_eer_enabled(d)     (0)
 689 #endif  /* CONFIG_DASD_ERR */
 690
 691 #endif                          /* __KERNEL__ */
 692
 693 #endif                          /* DASD_H */