drivers/s390/block/dasd_int.h

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_int.h
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   6  * Bugreports.to..: <Linux390@de.ibm.com>
   7  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   8  *
   9  */
  10
  11 #ifndef DASD_INT_H
  12 #define DASD_INT_H
  13
  14 #ifdef __KERNEL__
  15
  16 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
  17 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
  18 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
  19
  20 /*
  21  * States a dasd device can have:
  22  *   new: the dasd_device structure is allocated.
  23  *   known: the discipline for the device is identified.
  24  *   basic: the device can do basic i/o.
  25  *   unfmt: the device could not be analyzed (format is unknown).
  26  *   ready: partition detection is done and the device is can do block io.
  27  *   online: the device accepts requests from the block device queue.
  28  *
  29  * Things to do for startup state transitions:
  30  *   new -> known: find discipline for the device and create devfs entries.
  31  *   known -> basic: request irq line for the device.
  32  *   basic -> ready: do the initial analysis, e.g. format detection,
  33  *                   do block device setup and detect partitions.
  34  *   ready -> online: schedule the device tasklet.
  35  * Things to do for shutdown state transitions:
  36  *   online -> ready: just set the new device state.
  37  *   ready -> basic: flush requests from the block device layer, clear
  38  *                   partition information and reset format information.
  39  *   basic -> known: terminate all requests and free irq.
  40  *   known -> new: remove devfs entries and forget discipline.
  41  */
  42
  43 #define DASD_STATE_NEW    0
  44 #define DASD_STATE_KNOWN  1
  45 #define DASD_STATE_BASIC  2
  46 #define DASD_STATE_UNFMT  3
  47 #define DASD_STATE_READY  4
  48 #define DASD_STATE_ONLINE 5
  49
  50 #include <linux/module.h>
  51 #include <linux/wait.h>
  52 #include <linux/blkdev.h>
  53 #include <linux/genhd.h>
  54 #include <linux/hdreg.h>
  55 #include <linux/interrupt.h>
  56 #include <linux/log2.h>
  57 #include <asm/ccwdev.h>
  58 #include <linux/workqueue.h>
  59 #include <asm/debug.h>
  60 #include <asm/dasd.h>
  61 #include <asm/idals.h>
  62
  63 /*
  64  * SECTION: Type definitions
  65  */
  66 struct dasd_device;
  67 struct dasd_block;
  68
  69 /* BIT DEFINITIONS FOR SENSE DATA */
  70 #define DASD_SENSE_BIT_0 0x80
  71 #define DASD_SENSE_BIT_1 0x40
  72 #define DASD_SENSE_BIT_2 0x20
  73 #define DASD_SENSE_BIT_3 0x10
  74
  75 /*
  76  * SECTION: MACROs for klogd and s390 debug feature (dbf)
  77  */
  78 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
  79 do { \
  80         debug_sprintf_event(d_device->debug_area, \
  81                             d_level, \
  82                             d_str "\n", \
  83                             d_data); \
  84 } while(0)
  85
  86 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
  87 do { \
  88         debug_sprintf_exception(d_device->debug_area, \
  89                                 d_level, \
  90                                 d_str "\n", \
  91                                 d_data); \
  92 } while(0)
  93
  94 #define DBF_EVENT(d_level, d_str, d_data...)\
  95 do { \
  96         debug_sprintf_event(dasd_debug_area, \
  97                             d_level,\
  98                             d_str "\n", \
  99                             d_data); \
 100 } while(0)
 101
 102 #define DBF_EXC(d_level, d_str, d_data...)\
 103 do { \
 104         debug_sprintf_exception(dasd_debug_area, \
 105                                 d_level,\
 106                                 d_str "\n", \
 107                                 d_data); \
 108 } while(0)
 109
 110 /* definition of dbf debug levels */
 111 #define DBF_EMERG       0       /* system is unusable                   */
 112 #define DBF_ALERT       1       /* action must be taken immediately     */
 113 #define DBF_CRIT        2       /* critical conditions                  */
 114 #define DBF_ERR         3       /* error conditions                     */
 115 #define DBF_WARNING     4       /* warning conditions                   */
 116 #define DBF_NOTICE      5       /* normal but significant condition     */
 117 #define DBF_INFO        6       /* informational                        */
 118 #define DBF_DEBUG       6       /* debug-level messages                 */
 119
 120 /* messages to be written via klogd and dbf */
 121 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
 122 do { \
 123         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 124                d_device->cdev->dev.bus_id, d_args); \
 125         DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
 126 } while(0)
 127
 128 #define MESSAGE(d_loglevel,d_string,d_args...)\
 129 do { \
 130         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 131         DBF_EVENT(DBF_ALERT, d_string, d_args); \
 132 } while(0)
 133
 134 /* messages to be written via klogd only */
 135 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
 136 do { \
 137         printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
 138                d_device->cdev->dev.bus_id, d_args); \
 139 } while(0)
 140
 141 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
 142 do { \
 143         printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
 144 } while(0)
 145
 146 struct dasd_ccw_req {
 147         unsigned int magic;             /* Eye catcher */
 148         struct list_head devlist;       /* for dasd_device request queue */
 149         struct list_head blocklist;     /* for dasd_block request queue */
 150
 151         /* Where to execute what... */
 152         struct dasd_block *block;       /* the originating block device */
 153         struct dasd_device *memdev;     /* the device used to allocate this */
 154         struct dasd_device *startdev;   /* device the request is started on */
 155         struct ccw1 *cpaddr;            /* address of channel program */
 156         char status;                    /* status of this request */
 157         short retries;                  /* A retry counter */
 158         unsigned long flags;            /* flags of this request */
 159
 160         /* ... and how */
 161         unsigned long starttime;        /* jiffies time of request start */
 162         int expires;                    /* expiration period in jiffies */
 163         char lpm;                       /* logical path mask */
 164         void *data;                     /* pointer to data area */
 165
 166         /* these are important for recovering erroneous requests          */
 167         struct irb irb;                 /* device status in case of an error */
 168         struct dasd_ccw_req *refers;    /* ERP-chain queueing. */
 169         void *function;                 /* originating ERP action */
 170
 171         /* these are for statistics only */
 172         unsigned long long buildclk;    /* TOD-clock of request generation */
 173         unsigned long long startclk;    /* TOD-clock of request start */
 174         unsigned long long stopclk;     /* TOD-clock of request interrupt */
 175         unsigned long long endclk;      /* TOD-clock of request termination */
 176
 177         /* Callback that is called after reaching final status. */
 178         void (*callback)(struct dasd_ccw_req *, void *data);
 179         void *callback_data;
 180 };
 181
 182 /*
 183  * dasd_ccw_req -> status can be:
 184  */
 185 #define DASD_CQR_FILLED         0x00    /* request is ready to be processed */
 186 #define DASD_CQR_DONE           0x01    /* request is completed successfully */
 187 #define DASD_CQR_NEED_ERP       0x02    /* request needs recovery action */
 188 #define DASD_CQR_IN_ERP         0x03    /* request is in recovery */
 189 #define DASD_CQR_FAILED         0x04    /* request is finally failed */
 190 #define DASD_CQR_TERMINATED     0x05    /* request was stopped by driver */
 191
 192 #define DASD_CQR_QUEUED         0x80    /* request is queued to be processed */
 193 #define DASD_CQR_IN_IO          0x81    /* request is currently in IO */
 194 #define DASD_CQR_ERROR          0x82    /* request is completed with error */
 195 #define DASD_CQR_CLEAR_PENDING  0x83    /* request is clear pending */
 196 #define DASD_CQR_CLEARED        0x84    /* request was cleared */
 197 #define DASD_CQR_SUCCESS        0x85    /* request was successfull */
 198
 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. uncheck_device is called during
 226          * device shutdown to deregister a device from its discipline.
 227          */
 228         int (*check_device) (struct dasd_device *);
 229         void (*uncheck_device) (struct dasd_device *);
 230
 231         /*
 232          * do_analysis is used in the step from device state "basic" to
 233          * state "accept". It returns 0 if the device can be made ready,
 234          * it returns -EMEDIUMTYPE if the device can't be made ready or
 235          * -EAGAIN if do_analysis started a ccw that needs to complete
 236          * before the analysis may be repeated.
 237          */
 238         int (*do_analysis) (struct dasd_block *);
 239
 240         /*
 241          * Last things to do when a device is set online, and first things
 242          * when it is set offline.
 243          */
 244         int (*ready_to_online) (struct dasd_device *);
 245         int (*online_to_ready) (struct dasd_device *);
 246
 247         /*
 248          * Device operation functions. build_cp creates a ccw chain for
 249          * a block device request, start_io starts the request and
 250          * term_IO cancels it (e.g. in case of a timeout). format_device
 251          * returns a ccw chain to be used to format the device.
 252          * handle_terminated_request allows to examine a cqr and prepare
 253          * it for retry.
 254          */
 255         struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
 256                                           struct dasd_block *,
 257                                           struct request *);
 258         int (*start_IO) (struct dasd_ccw_req *);
 259         int (*term_IO) (struct dasd_ccw_req *);
 260         void (*handle_terminated_request) (struct dasd_ccw_req *);
 261         struct dasd_ccw_req *(*format_device) (struct dasd_device *,
 262                                                struct format_data_t *);
 263         int (*free_cp) (struct dasd_ccw_req *, struct request *);
 264
 265         /*
 266          * Error recovery functions. examine_error() returns a value that
 267          * indicates what to do for an error condition. If examine_error()
 268          * returns 'dasd_era_recover' erp_action() is called to create a
 269          * special error recovery ccw. erp_postaction() is called after
 270          * an error recovery ccw has finished its execution. dump_sense
 271          * is called for every error condition to print the sense data
 272          * to the console.
 273          */
 274         dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
 275         dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
 276         void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
 277                             struct irb *);
 278
 279         void (*handle_unsolicited_interrupt) (struct dasd_device *,
 280                                               struct irb *);
 281
 282         /* i/o control functions. */
 283         int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
 284         int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
 285         int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
 286 };
 287
 288 extern struct dasd_discipline *dasd_diag_discipline_pointer;
 289
 290 /*
 291  * Unique identifier for dasd device.
 292  */
 293 #define UA_NOT_CONFIGURED  0x00
 294 #define UA_BASE_DEVICE     0x01
 295 #define UA_BASE_PAV_ALIAS  0x02
 296 #define UA_HYPER_PAV_ALIAS 0x03
 297
 298 struct dasd_uid {
 299         __u8 type;
 300         char vendor[4];
 301         char serial[15];
 302         __u16 ssid;
 303         __u8 real_unit_addr;
 304         __u8 base_unit_addr;
 305 };
 306
 307 /*
 308  * Notification numbers for extended error reporting notifications:
 309  * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
 310  * eer pointer) is freed. The error reporting module needs to do all necessary
 311  * cleanup steps.
 312  * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
 313  */
 314 #define DASD_EER_DISABLE 0
 315 #define DASD_EER_TRIGGER 1
 316
 317 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
 318 #define DASD_EER_FATALERROR  1
 319 #define DASD_EER_NOPATH      2
 320 #define DASD_EER_STATECHANGE 3
 321 #define DASD_EER_PPRCSUSPEND 4
 322
 323 struct dasd_device {
 324         /* Block device stuff. */
 325         struct dasd_block *block;
 326
 327         unsigned int devindex;
 328         unsigned long flags;       /* per device flags */
 329         unsigned short features;   /* copy of devmap-features (read-only!) */
 330
 331         /* extended error reporting stuff (eer) */
 332         struct dasd_ccw_req *eer_cqr;
 333
 334         /* Device discipline stuff. */
 335         struct dasd_discipline *discipline;
 336         struct dasd_discipline *base_discipline;
 337         char *private;
 338
 339         /* Device state and target state. */
 340         int state, target;
 341         int stopped;            /* device (ccw_device_start) was stopped */
 342
 343         /* reference count. */
 344         atomic_t ref_count;
 345
 346         /* ccw queue and memory for static ccw/erp buffers. */
 347         struct list_head ccw_queue;
 348         spinlock_t mem_lock;
 349         void *ccw_mem;
 350         void *erp_mem;
 351         struct list_head ccw_chunks;
 352         struct list_head erp_chunks;
 353
 354         atomic_t tasklet_scheduled;
 355         struct tasklet_struct tasklet;
 356         struct work_struct kick_work;
 357         struct timer_list timer;
 358
 359         debug_info_t *debug_area;
 360
 361         struct ccw_device *cdev;
 362
 363         /* hook for alias management */
 364         struct list_head alias_list;
 365 };
 366
 367 struct dasd_block {
 368         /* Block device stuff. */
 369         struct gendisk *gdp;
 370         struct request_queue *request_queue;
 371         spinlock_t request_queue_lock;
 372         struct block_device *bdev;
 373         atomic_t open_count;
 374
 375         unsigned long blocks;      /* size of volume in blocks */
 376         unsigned int bp_block;     /* bytes per block */
 377         unsigned int s2b_shift;    /* log2 (bp_block/512) */
 378
 379         struct dasd_device *base;
 380         struct list_head ccw_queue;
 381         spinlock_t queue_lock;
 382
 383         atomic_t tasklet_scheduled;
 384         struct tasklet_struct tasklet;
 385         struct timer_list timer;
 386
 387 #ifdef CONFIG_DASD_PROFILE
 388         struct dasd_profile_info_t profile;
 389 #endif
 390 };
 391
 392
 393
 394 /* reasons why device (ccw_device_start) was stopped */
 395 #define DASD_STOPPED_NOT_ACC 1         /* not accessible */
 396 #define DASD_STOPPED_QUIESCE 2         /* Quiesced */
 397 #define DASD_STOPPED_PENDING 4         /* long busy */
 398 #define DASD_STOPPED_DC_WAIT 8         /* disconnected, wait */
 399 #define DASD_STOPPED_SU      16        /* summary unit check handling */
 400
 401 /* per device flags */
 402 #define DASD_FLAG_OFFLINE       3       /* device is in offline processing */
 403 #define DASD_FLAG_EER_SNSS      4       /* A SNSS is required */
 404 #define DASD_FLAG_EER_IN_USE    5       /* A SNSS request is running */
 405
 406 void dasd_put_device_wake(struct dasd_device *);
 407
 408 /*
 409  * Reference count inliners
 410  */
 411 static inline void
 412 dasd_get_device(struct dasd_device *device)
 413 {
 414         atomic_inc(&device->ref_count);
 415 }
 416
 417 static inline void
 418 dasd_put_device(struct dasd_device *device)
 419 {
 420         if (atomic_dec_return(&device->ref_count) == 0)
 421                 dasd_put_device_wake(device);
 422 }
 423
 424 /*
 425  * The static memory in ccw_mem and erp_mem is managed by a sorted
 426  * list of free memory chunks.
 427  */
 428 struct dasd_mchunk
 429 {
 430         struct list_head list;
 431         unsigned long size;
 432 } __attribute__ ((aligned(8)));
 433
 434 static inline void
 435 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
 436                     unsigned long size)
 437 {
 438         struct dasd_mchunk *chunk;
 439
 440         INIT_LIST_HEAD(chunk_list);
 441         chunk = (struct dasd_mchunk *) mem;
 442         chunk->size = size - sizeof(struct dasd_mchunk);
 443         list_add(&chunk->list, chunk_list);
 444 }
 445
 446 static inline void *
 447 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
 448 {
 449         struct dasd_mchunk *chunk, *tmp;
 450
 451         size = (size + 7L) & -8L;
 452         list_for_each_entry(chunk, chunk_list, list) {
 453                 if (chunk->size < size)
 454                         continue;
 455                 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
 456                         char *endaddr = (char *) (chunk + 1) + chunk->size;
 457                         tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
 458                         tmp->size = size;
 459                         chunk->size -= size + sizeof(struct dasd_mchunk);
 460                         chunk = tmp;
 461                 } else
 462                         list_del(&chunk->list);
 463                 return (void *) (chunk + 1);
 464         }
 465         return NULL;
 466 }
 467
 468 static inline void
 469 dasd_free_chunk(struct list_head *chunk_list, void *mem)
 470 {
 471         struct dasd_mchunk *chunk, *tmp;
 472         struct list_head *p, *left;
 473
 474         chunk = (struct dasd_mchunk *)
 475                 ((char *) mem - sizeof(struct dasd_mchunk));
 476         /* Find out the left neighbour in chunk_list. */
 477         left = chunk_list;
 478         list_for_each(p, chunk_list) {
 479                 if (list_entry(p, struct dasd_mchunk, list) > chunk)
 480                         break;
 481                 left = p;
 482         }
 483         /* Try to merge with right neighbour = next element from left. */
 484         if (left->next != chunk_list) {
 485                 tmp = list_entry(left->next, struct dasd_mchunk, list);
 486                 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
 487                         list_del(&tmp->list);
 488                         chunk->size += tmp->size + sizeof(struct dasd_mchunk);
 489                 }
 490         }
 491         /* Try to merge with left neighbour. */
 492         if (left != chunk_list) {
 493                 tmp = list_entry(left, struct dasd_mchunk, list);
 494                 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
 495                         tmp->size += chunk->size + sizeof(struct dasd_mchunk);
 496                         return;
 497                 }
 498         }
 499         __list_add(&chunk->list, left, left->next);
 500 }
 501
 502 /*
 503  * Check if bsize is in { 512, 1024, 2048, 4096 }
 504  */
 505 static inline int
 506 dasd_check_blocksize(int bsize)
 507 {
 508         if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
 509                 return -EMEDIUMTYPE;
 510         return 0;
 511 }
 512
 513 /* externals in dasd.c */
 514 #define DASD_PROFILE_ON  1
 515 #define DASD_PROFILE_OFF 0
 516
 517 extern debug_info_t *dasd_debug_area;
 518 extern struct dasd_profile_info_t dasd_global_profile;
 519 extern unsigned int dasd_profile_level;
 520 extern struct block_device_operations dasd_device_operations;
 521
 522 extern struct kmem_cache *dasd_page_cache;
 523
 524 struct dasd_ccw_req *
 525 dasd_kmalloc_request(char *, int, int, struct dasd_device *);
 526 struct dasd_ccw_req *
 527 dasd_smalloc_request(char *, int, int, struct dasd_device *);
 528 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 529 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 530
 531 static inline int
 532 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
 533 {
 534         return set_normalized_cda(ccw, cda);
 535 }
 536
 537 struct dasd_device *dasd_alloc_device(void);
 538 void dasd_free_device(struct dasd_device *);
 539
 540 struct dasd_block *dasd_alloc_block(void);
 541 void dasd_free_block(struct dasd_block *);
 542
 543 void dasd_enable_device(struct dasd_device *);
 544 void dasd_set_target_state(struct dasd_device *, int);
 545 void dasd_kick_device(struct dasd_device *);
 546
 547 void dasd_add_request_head(struct dasd_ccw_req *);
 548 void dasd_add_request_tail(struct dasd_ccw_req *);
 549 int  dasd_start_IO(struct dasd_ccw_req *);
 550 int  dasd_term_IO(struct dasd_ccw_req *);
 551 void dasd_schedule_device_bh(struct dasd_device *);
 552 void dasd_schedule_block_bh(struct dasd_block *);
 553 int  dasd_sleep_on(struct dasd_ccw_req *);
 554 int  dasd_sleep_on_immediatly(struct dasd_ccw_req *);
 555 int  dasd_sleep_on_interruptible(struct dasd_ccw_req *);
 556 void dasd_device_set_timer(struct dasd_device *, int);
 557 void dasd_device_clear_timer(struct dasd_device *);
 558 void dasd_block_set_timer(struct dasd_block *, int);
 559 void dasd_block_clear_timer(struct dasd_block *);
 560 int  dasd_cancel_req(struct dasd_ccw_req *);
 561 int dasd_flush_device_queue(struct dasd_device *);
 562 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
 563 void dasd_generic_remove (struct ccw_device *cdev);
 564 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 565 int dasd_generic_set_offline (struct ccw_device *cdev);
 566 int dasd_generic_notify(struct ccw_device *, int);
 567 void dasd_generic_handle_state_change(struct dasd_device *);
 568
 569 int dasd_generic_read_dev_chars(struct dasd_device *, char *, void **, int);
 570
 571 /* externals in dasd_devmap.c */
 572 extern int dasd_max_devindex;
 573 extern int dasd_probeonly;
 574 extern int dasd_autodetect;
 575 extern int dasd_nopav;
 576
 577 int dasd_devmap_init(void);
 578 void dasd_devmap_exit(void);
 579
 580 struct dasd_device *dasd_create_device(struct ccw_device *);
 581 void dasd_delete_device(struct dasd_device *);
 582
 583 int dasd_get_uid(struct ccw_device *, struct dasd_uid *);
 584 int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
 585 int dasd_get_feature(struct ccw_device *, int);
 586 int dasd_set_feature(struct ccw_device *, int, int);
 587
 588 int dasd_add_sysfs_files(struct ccw_device *);
 589 void dasd_remove_sysfs_files(struct ccw_device *);
 590
 591 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
 592 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
 593 struct dasd_device *dasd_device_from_devindex(int);
 594
 595 int dasd_parse(void);
 596 int dasd_busid_known(char *);
 597
 598 /* externals in dasd_gendisk.c */
 599 int  dasd_gendisk_init(void);
 600 void dasd_gendisk_exit(void);
 601 int dasd_gendisk_alloc(struct dasd_block *);
 602 void dasd_gendisk_free(struct dasd_block *);
 603 int dasd_scan_partitions(struct dasd_block *);
 604 void dasd_destroy_partitions(struct dasd_block *);
 605
 606 /* externals in dasd_ioctl.c */
 607 int  dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
 608 long dasd_compat_ioctl(struct file *, unsigned int, unsigned long);
 609
 610 /* externals in dasd_proc.c */
 611 int dasd_proc_init(void);
 612 void dasd_proc_exit(void);
 613
 614 /* externals in dasd_erp.c */
 615 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
 616 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
 617 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
 618                                             struct dasd_device *);
 619 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
 620 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
 621
 622 /* externals in dasd_3990_erp.c */
 623 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
 624
 625 /* externals in dasd_eer.c */
 626 #ifdef CONFIG_DASD_EER
 627 int dasd_eer_init(void);
 628 void dasd_eer_exit(void);
 629 int dasd_eer_enable(struct dasd_device *);
 630 void dasd_eer_disable(struct dasd_device *);
 631 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
 632                     unsigned int id);
 633 void dasd_eer_snss(struct dasd_device *);
 634
 635 static inline int dasd_eer_enabled(struct dasd_device *device)
 636 {
 637         return device->eer_cqr != NULL;
 638 }
 639 #else
 640 #define dasd_eer_init()         (0)
 641 #define dasd_eer_exit()         do { } while (0)
 642 #define dasd_eer_enable(d)      (0)
 643 #define dasd_eer_disable(d)     do { } while (0)
 644 #define dasd_eer_write(d,c,i)   do { } while (0)
 645 #define dasd_eer_snss(d)        do { } while (0)
 646 #define dasd_eer_enabled(d)     (0)
 647 #endif  /* CONFIG_DASD_ERR */
 648
 649 #endif                          /* __KERNEL__ */
 650
 651 #endif                          /* DASD_H */