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 */ 681