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 /* lock class for nested cdev lock */ 85 #define CDEV_NESTED_FIRST 1 86 #define CDEV_NESTED_SECOND 2 87 88 /* 89 * SECTION: MACROs for klogd and s390 debug feature (dbf) 90 */ 91 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ 92 do { \ 93 debug_sprintf_event(d_device->debug_area, \ 94 d_level, \ 95 d_str "\n", \ 96 d_data); \ 97 } while(0) 98 99 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \ 100 do { \ 101 debug_sprintf_exception(d_device->debug_area, \ 102 d_level, \ 103 d_str "\n", \ 104 d_data); \ 105 } while(0) 106 107 #define DBF_EVENT(d_level, d_str, d_data...)\ 108 do { \ 109 debug_sprintf_event(dasd_debug_area, \ 110 d_level,\ 111 d_str "\n", \ 112 d_data); \ 113 } while(0) 114 115 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \ 116 do { \ 117 struct ccw_dev_id __dev_id; \ 118 ccw_device_get_id(d_cdev, &__dev_id); \ 119 debug_sprintf_event(dasd_debug_area, \ 120 d_level, \ 121 "0.%x.%04x " d_str "\n", \ 122 __dev_id.ssid, __dev_id.devno, d_data); \ 123 } while (0) 124 125 #define DBF_EXC(d_level, d_str, d_data...)\ 126 do { \ 127 debug_sprintf_exception(dasd_debug_area, \ 128 d_level,\ 129 d_str "\n", \ 130 d_data); \ 131 } while(0) 132 133 /* limit size for an errorstring */ 134 #define ERRORLENGTH 30 135 136 /* definition of dbf debug levels */ 137 #define DBF_EMERG 0 /* system is unusable */ 138 #define DBF_ALERT 1 /* action must be taken immediately */ 139 #define DBF_CRIT 2 /* critical conditions */ 140 #define DBF_ERR 3 /* error conditions */ 141 #define DBF_WARNING 4 /* warning conditions */ 142 #define DBF_NOTICE 5 /* normal but significant condition */ 143 #define DBF_INFO 6 /* informational */ 144 #define DBF_DEBUG 6 /* debug-level messages */ 145 146 /* messages to be written via klogd and dbf */ 147 #define DEV_MESSAGE(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 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ 152 } while(0) 153 154 #define MESSAGE(d_loglevel,d_string,d_args...)\ 155 do { \ 156 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 157 DBF_EVENT(DBF_ALERT, d_string, d_args); \ 158 } while(0) 159 160 /* messages to be written via klogd only */ 161 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ 162 do { \ 163 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 164 dev_name(&d_device->cdev->dev), d_args); \ 165 } while(0) 166 167 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ 168 do { \ 169 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 170 } while(0) 171 172 struct dasd_ccw_req { 173 unsigned int magic; /* Eye catcher */ 174 struct list_head devlist; /* for dasd_device request queue */ 175 struct list_head blocklist; /* for dasd_block request queue */ 176 177 /* Where to execute what... */ 178 struct dasd_block *block; /* the originating block device */ 179 struct dasd_device *memdev; /* the device used to allocate this */ 180 struct dasd_device *startdev; /* device the request is started on */ 181 void *cpaddr; /* address of ccw or tcw */ 182 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ 183 char status; /* status of this request */ 184 short retries; /* A retry counter */ 185 unsigned long flags; /* flags of this request */ 186 187 /* ... and how */ 188 unsigned long starttime; /* jiffies time of request start */ 189 unsigned long expires; /* expiration period in jiffies */ 190 char lpm; /* logical path mask */ 191 void *data; /* pointer to data area */ 192 193 /* these are important for recovering erroneous requests */ 194 int intrc; /* internal error, e.g. from start_IO */ 195 struct irb irb; /* device status in case of an error */ 196 struct dasd_ccw_req *refers; /* ERP-chain queueing. */ 197 void *function; /* originating ERP action */ 198 199 /* these are for statistics only */ 200 unsigned long long buildclk; /* TOD-clock of request generation */ 201 unsigned long long startclk; /* TOD-clock of request start */ 202 unsigned long long stopclk; /* TOD-clock of request interrupt */ 203 unsigned long long endclk; /* TOD-clock of request termination */ 204 205 /* Callback that is called after reaching final status. */ 206 void (*callback)(struct dasd_ccw_req *, void *data); 207 void *callback_data; 208 }; 209 210 /* 211 * dasd_ccw_req -> status can be: 212 */ 213 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ 214 #define DASD_CQR_DONE 0x01 /* request is completed successfully */ 215 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */ 216 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */ 217 #define DASD_CQR_FAILED 0x04 /* request is finally failed */ 218 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */ 219 220 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */ 221 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */ 222 #define DASD_CQR_ERROR 0x82 /* request is completed with error */ 223 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */ 224 #define DASD_CQR_CLEARED 0x84 /* request was cleared */ 225 #define DASD_CQR_SUCCESS 0x85 /* request was successful */ 226 227 /* default expiration time*/ 228 #define DASD_EXPIRES 300 229 #define DASD_EXPIRES_MAX 40000000 230 231 /* per dasd_ccw_req flags */ 232 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ 233 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ 234 235 /* Signature for error recovery functions. */ 236 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 237 238 /* 239 * Unique identifier for dasd device. 240 */ 241 #define UA_NOT_CONFIGURED 0x00 242 #define UA_BASE_DEVICE 0x01 243 #define UA_BASE_PAV_ALIAS 0x02 244 #define UA_HYPER_PAV_ALIAS 0x03 245 246 struct dasd_uid { 247 __u8 type; 248 char vendor[4]; 249 char serial[15]; 250 __u16 ssid; 251 __u8 real_unit_addr; 252 __u8 base_unit_addr; 253 char vduit[33]; 254 }; 255 256 /* 257 * the struct dasd_discipline is 258 * sth like a table of virtual functions, if you think of dasd_eckd 259 * inheriting dasd... 260 * no, currently we are not planning to reimplement the driver in C++ 261 */ 262 struct dasd_discipline { 263 struct module *owner; 264 char ebcname[8]; /* a name used for tagging and printks */ 265 char name[8]; /* a name used for tagging and printks */ 266 int max_blocks; /* maximum number of blocks to be chained */ 267 268 struct list_head list; /* used for list of disciplines */ 269 270 /* 271 * Device recognition functions. check_device is used to verify 272 * the sense data and the information returned by read device 273 * characteristics. It returns 0 if the discipline can be used 274 * for the device in question. uncheck_device is called during 275 * device shutdown to deregister a device from its discipline. 276 */ 277 int (*check_device) (struct dasd_device *); 278 void (*uncheck_device) (struct dasd_device *); 279 280 /* 281 * do_analysis is used in the step from device state "basic" to 282 * state "accept". It returns 0 if the device can be made ready, 283 * it returns -EMEDIUMTYPE if the device can't be made ready or 284 * -EAGAIN if do_analysis started a ccw that needs to complete 285 * before the analysis may be repeated. 286 */ 287 int (*do_analysis) (struct dasd_block *); 288 289 /* 290 * Last things to do when a device is set online, and first things 291 * when it is set offline. 292 */ 293 int (*ready_to_online) (struct dasd_device *); 294 int (*online_to_ready) (struct dasd_device *); 295 296 /* 297 * Device operation functions. build_cp creates a ccw chain for 298 * a block device request, start_io starts the request and 299 * term_IO cancels it (e.g. in case of a timeout). format_device 300 * returns a ccw chain to be used to format the device. 301 * handle_terminated_request allows to examine a cqr and prepare 302 * it for retry. 303 */ 304 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 305 struct dasd_block *, 306 struct request *); 307 int (*start_IO) (struct dasd_ccw_req *); 308 int (*term_IO) (struct dasd_ccw_req *); 309 void (*handle_terminated_request) (struct dasd_ccw_req *); 310 struct dasd_ccw_req *(*format_device) (struct dasd_device *, 311 struct format_data_t *); 312 int (*free_cp) (struct dasd_ccw_req *, struct request *); 313 314 /* 315 * Error recovery functions. examine_error() returns a value that 316 * indicates what to do for an error condition. If examine_error() 317 * returns 'dasd_era_recover' erp_action() is called to create a 318 * special error recovery ccw. erp_postaction() is called after 319 * an error recovery ccw has finished its execution. dump_sense 320 * is called for every error condition to print the sense data 321 * to the console. 322 */ 323 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 324 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 325 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 326 struct irb *); 327 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 328 329 void (*handle_unsolicited_interrupt) (struct dasd_device *, 330 struct irb *); 331 332 /* i/o control functions. */ 333 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 334 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 335 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 336 337 /* suspend/resume functions */ 338 int (*freeze) (struct dasd_device *); 339 int (*restore) (struct dasd_device *); 340 341 /* reload device after state change */ 342 int (*reload) (struct dasd_device *); 343 344 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 345 }; 346 347 extern struct dasd_discipline *dasd_diag_discipline_pointer; 348 349 /* 350 * Notification numbers for extended error reporting notifications: 351 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 352 * eer pointer) is freed. The error reporting module needs to do all necessary 353 * cleanup steps. 354 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 355 */ 356 #define DASD_EER_DISABLE 0 357 #define DASD_EER_TRIGGER 1 358 359 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 360 #define DASD_EER_FATALERROR 1 361 #define DASD_EER_NOPATH 2 362 #define DASD_EER_STATECHANGE 3 363 #define DASD_EER_PPRCSUSPEND 4 364 365 struct dasd_device { 366 /* Block device stuff. */ 367 struct dasd_block *block; 368 369 unsigned int devindex; 370 unsigned long flags; /* per device flags */ 371 unsigned short features; /* copy of devmap-features (read-only!) */ 372 373 /* extended error reporting stuff (eer) */ 374 struct dasd_ccw_req *eer_cqr; 375 376 /* Device discipline stuff. */ 377 struct dasd_discipline *discipline; 378 struct dasd_discipline *base_discipline; 379 char *private; 380 381 /* Device state and target state. */ 382 int state, target; 383 struct mutex state_mutex; 384 int stopped; /* device (ccw_device_start) was stopped */ 385 386 /* reference count. */ 387 atomic_t ref_count; 388 389 /* ccw queue and memory for static ccw/erp buffers. */ 390 struct list_head ccw_queue; 391 spinlock_t mem_lock; 392 void *ccw_mem; 393 void *erp_mem; 394 struct list_head ccw_chunks; 395 struct list_head erp_chunks; 396 397 atomic_t tasklet_scheduled; 398 struct tasklet_struct tasklet; 399 struct work_struct kick_work; 400 struct work_struct restore_device; 401 struct work_struct reload_device; 402 struct timer_list timer; 403 404 debug_info_t *debug_area; 405 406 struct ccw_device *cdev; 407 408 /* hook for alias management */ 409 struct list_head alias_list; 410 411 /* default expiration time in s */ 412 unsigned long default_expires; 413 }; 414 415 struct dasd_block { 416 /* Block device stuff. */ 417 struct gendisk *gdp; 418 struct request_queue *request_queue; 419 spinlock_t request_queue_lock; 420 struct block_device *bdev; 421 atomic_t open_count; 422 423 unsigned long long blocks; /* size of volume in blocks */ 424 unsigned int bp_block; /* bytes per block */ 425 unsigned int s2b_shift; /* log2 (bp_block/512) */ 426 427 struct dasd_device *base; 428 struct list_head ccw_queue; 429 spinlock_t queue_lock; 430 431 atomic_t tasklet_scheduled; 432 struct tasklet_struct tasklet; 433 struct timer_list timer; 434 435 #ifdef CONFIG_DASD_PROFILE 436 struct dasd_profile_info_t profile; 437 #endif 438 }; 439 440 441 442 /* reasons why device (ccw_device_start) was stopped */ 443 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 444 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 445 #define DASD_STOPPED_PENDING 4 /* long busy */ 446 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 447 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 448 #define DASD_STOPPED_PM 32 /* pm state transition */ 449 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 450 451 /* per device flags */ 452 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 453 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 454 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 455 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 456 * confuse this with the user specified 457 * read-only feature. 458 */ 459 460 void dasd_put_device_wake(struct dasd_device *); 461 462 /* 463 * Reference count inliners 464 */ 465 static inline void 466 dasd_get_device(struct dasd_device *device) 467 { 468 atomic_inc(&device->ref_count); 469 } 470 471 static inline void 472 dasd_put_device(struct dasd_device *device) 473 { 474 if (atomic_dec_return(&device->ref_count) == 0) 475 dasd_put_device_wake(device); 476 } 477 478 /* 479 * The static memory in ccw_mem and erp_mem is managed by a sorted 480 * list of free memory chunks. 481 */ 482 struct dasd_mchunk 483 { 484 struct list_head list; 485 unsigned long size; 486 } __attribute__ ((aligned(8))); 487 488 static inline void 489 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 490 unsigned long size) 491 { 492 struct dasd_mchunk *chunk; 493 494 INIT_LIST_HEAD(chunk_list); 495 chunk = (struct dasd_mchunk *) mem; 496 chunk->size = size - sizeof(struct dasd_mchunk); 497 list_add(&chunk->list, chunk_list); 498 } 499 500 static inline void * 501 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 502 { 503 struct dasd_mchunk *chunk, *tmp; 504 505 size = (size + 7L) & -8L; 506 list_for_each_entry(chunk, chunk_list, list) { 507 if (chunk->size < size) 508 continue; 509 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 510 char *endaddr = (char *) (chunk + 1) + chunk->size; 511 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 512 tmp->size = size; 513 chunk->size -= size + sizeof(struct dasd_mchunk); 514 chunk = tmp; 515 } else 516 list_del(&chunk->list); 517 return (void *) (chunk + 1); 518 } 519 return NULL; 520 } 521 522 static inline void 523 dasd_free_chunk(struct list_head *chunk_list, void *mem) 524 { 525 struct dasd_mchunk *chunk, *tmp; 526 struct list_head *p, *left; 527 528 chunk = (struct dasd_mchunk *) 529 ((char *) mem - sizeof(struct dasd_mchunk)); 530 /* Find out the left neighbour in chunk_list. */ 531 left = chunk_list; 532 list_for_each(p, chunk_list) { 533 if (list_entry(p, struct dasd_mchunk, list) > chunk) 534 break; 535 left = p; 536 } 537 /* Try to merge with right neighbour = next element from left. */ 538 if (left->next != chunk_list) { 539 tmp = list_entry(left->next, struct dasd_mchunk, list); 540 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 541 list_del(&tmp->list); 542 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 543 } 544 } 545 /* Try to merge with left neighbour. */ 546 if (left != chunk_list) { 547 tmp = list_entry(left, struct dasd_mchunk, list); 548 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 549 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 550 return; 551 } 552 } 553 __list_add(&chunk->list, left, left->next); 554 } 555 556 /* 557 * Check if bsize is in { 512, 1024, 2048, 4096 } 558 */ 559 static inline int 560 dasd_check_blocksize(int bsize) 561 { 562 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 563 return -EMEDIUMTYPE; 564 return 0; 565 } 566 567 /* externals in dasd.c */ 568 #define DASD_PROFILE_ON 1 569 #define DASD_PROFILE_OFF 0 570 571 extern debug_info_t *dasd_debug_area; 572 extern struct dasd_profile_info_t dasd_global_profile; 573 extern unsigned int dasd_profile_level; 574 extern const struct block_device_operations dasd_device_operations; 575 576 extern struct kmem_cache *dasd_page_cache; 577 578 struct dasd_ccw_req * 579 dasd_kmalloc_request(int , int, int, struct dasd_device *); 580 struct dasd_ccw_req * 581 dasd_smalloc_request(int , int, int, struct dasd_device *); 582 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 583 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 584 585 static inline int 586 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 587 { 588 return set_normalized_cda(ccw, cda); 589 } 590 591 struct dasd_device *dasd_alloc_device(void); 592 void dasd_free_device(struct dasd_device *); 593 594 struct dasd_block *dasd_alloc_block(void); 595 void dasd_free_block(struct dasd_block *); 596 597 void dasd_enable_device(struct dasd_device *); 598 void dasd_set_target_state(struct dasd_device *, int); 599 void dasd_kick_device(struct dasd_device *); 600 void dasd_restore_device(struct dasd_device *); 601 void dasd_reload_device(struct dasd_device *); 602 603 void dasd_add_request_head(struct dasd_ccw_req *); 604 void dasd_add_request_tail(struct dasd_ccw_req *); 605 int dasd_start_IO(struct dasd_ccw_req *); 606 int dasd_term_IO(struct dasd_ccw_req *); 607 void dasd_schedule_device_bh(struct dasd_device *); 608 void dasd_schedule_block_bh(struct dasd_block *); 609 int dasd_sleep_on(struct dasd_ccw_req *); 610 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 611 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 612 void dasd_device_set_timer(struct dasd_device *, int); 613 void dasd_device_clear_timer(struct dasd_device *); 614 void dasd_block_set_timer(struct dasd_block *, int); 615 void dasd_block_clear_timer(struct dasd_block *); 616 int dasd_cancel_req(struct dasd_ccw_req *); 617 int dasd_flush_device_queue(struct dasd_device *); 618 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 619 void dasd_generic_remove (struct ccw_device *cdev); 620 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 621 int dasd_generic_set_offline (struct ccw_device *cdev); 622 int dasd_generic_notify(struct ccw_device *, int); 623 void dasd_generic_handle_state_change(struct dasd_device *); 624 int dasd_generic_pm_freeze(struct ccw_device *); 625 int dasd_generic_restore_device(struct ccw_device *); 626 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 627 628 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 629 char *dasd_get_sense(struct irb *); 630 631 void dasd_device_set_stop_bits(struct dasd_device *, int); 632 void dasd_device_remove_stop_bits(struct dasd_device *, int); 633 634 int dasd_device_is_ro(struct dasd_device *); 635 636 637 /* externals in dasd_devmap.c */ 638 extern int dasd_max_devindex; 639 extern int dasd_probeonly; 640 extern int dasd_autodetect; 641 extern int dasd_nopav; 642 extern int dasd_nofcx; 643 644 int dasd_devmap_init(void); 645 void dasd_devmap_exit(void); 646 647 struct dasd_device *dasd_create_device(struct ccw_device *); 648 void dasd_delete_device(struct dasd_device *); 649 650 int dasd_get_feature(struct ccw_device *, int); 651 int dasd_set_feature(struct ccw_device *, int, int); 652 653 int dasd_add_sysfs_files(struct ccw_device *); 654 void dasd_remove_sysfs_files(struct ccw_device *); 655 656 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 657 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 658 struct dasd_device *dasd_device_from_devindex(int); 659 660 int dasd_parse(void); 661 int dasd_busid_known(const char *); 662 663 /* externals in dasd_gendisk.c */ 664 int dasd_gendisk_init(void); 665 void dasd_gendisk_exit(void); 666 int dasd_gendisk_alloc(struct dasd_block *); 667 void dasd_gendisk_free(struct dasd_block *); 668 int dasd_scan_partitions(struct dasd_block *); 669 void dasd_destroy_partitions(struct dasd_block *); 670 671 /* externals in dasd_ioctl.c */ 672 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 673 674 /* externals in dasd_proc.c */ 675 int dasd_proc_init(void); 676 void dasd_proc_exit(void); 677 678 /* externals in dasd_erp.c */ 679 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 680 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 681 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 682 struct dasd_device *); 683 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 684 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 685 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 686 687 /* externals in dasd_3990_erp.c */ 688 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 689 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 690 691 /* externals in dasd_eer.c */ 692 #ifdef CONFIG_DASD_EER 693 int dasd_eer_init(void); 694 void dasd_eer_exit(void); 695 int dasd_eer_enable(struct dasd_device *); 696 void dasd_eer_disable(struct dasd_device *); 697 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 698 unsigned int id); 699 void dasd_eer_snss(struct dasd_device *); 700 701 static inline int dasd_eer_enabled(struct dasd_device *device) 702 { 703 return device->eer_cqr != NULL; 704 } 705 #else 706 #define dasd_eer_init() (0) 707 #define dasd_eer_exit() do { } while (0) 708 #define dasd_eer_enable(d) (0) 709 #define dasd_eer_disable(d) do { } while (0) 710 #define dasd_eer_write(d,c,i) do { } while (0) 711 #define dasd_eer_snss(d) do { } while (0) 712 #define dasd_eer_enabled(d) (0) 713 #endif /* CONFIG_DASD_ERR */ 714 715 #endif /* __KERNEL__ */ 716 717 #endif /* DASD_H */ 718