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 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */ 14 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS)) 15 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1) 16 17 /* 18 * States a dasd device can have: 19 * new: the dasd_device structure is allocated. 20 * known: the discipline for the device is identified. 21 * basic: the device can do basic i/o. 22 * unfmt: the device could not be analyzed (format is unknown). 23 * ready: partition detection is done and the device is can do block io. 24 * online: the device accepts requests from the block device queue. 25 * 26 * Things to do for startup state transitions: 27 * new -> known: find discipline for the device and create devfs entries. 28 * known -> basic: request irq line for the device. 29 * basic -> ready: do the initial analysis, e.g. format detection, 30 * do block device setup and detect partitions. 31 * ready -> online: schedule the device tasklet. 32 * Things to do for shutdown state transitions: 33 * online -> ready: just set the new device state. 34 * ready -> basic: flush requests from the block device layer, clear 35 * partition information and reset format information. 36 * basic -> known: terminate all requests and free irq. 37 * known -> new: remove devfs entries and forget discipline. 38 */ 39 40 #define DASD_STATE_NEW 0 41 #define DASD_STATE_KNOWN 1 42 #define DASD_STATE_BASIC 2 43 #define DASD_STATE_UNFMT 3 44 #define DASD_STATE_READY 4 45 #define DASD_STATE_ONLINE 5 46 47 #include <linux/module.h> 48 #include <linux/wait.h> 49 #include <linux/blkdev.h> 50 #include <linux/genhd.h> 51 #include <linux/hdreg.h> 52 #include <linux/interrupt.h> 53 #include <linux/log2.h> 54 #include <asm/ccwdev.h> 55 #include <linux/workqueue.h> 56 #include <asm/debug.h> 57 #include <asm/dasd.h> 58 #include <asm/idals.h> 59 60 /* DASD discipline magic */ 61 #define DASD_ECKD_MAGIC 0xC5C3D2C4 62 #define DASD_DIAG_MAGIC 0xC4C9C1C7 63 #define DASD_FBA_MAGIC 0xC6C2C140 64 65 /* 66 * SECTION: Type definitions 67 */ 68 struct dasd_device; 69 struct dasd_block; 70 71 /* BIT DEFINITIONS FOR SENSE DATA */ 72 #define DASD_SENSE_BIT_0 0x80 73 #define DASD_SENSE_BIT_1 0x40 74 #define DASD_SENSE_BIT_2 0x20 75 #define DASD_SENSE_BIT_3 0x10 76 77 /* BIT DEFINITIONS FOR SIM SENSE */ 78 #define DASD_SIM_SENSE 0x0F 79 #define DASD_SIM_MSG_TO_OP 0x03 80 #define DASD_SIM_LOG 0x0C 81 82 /* lock class for nested cdev lock */ 83 #define CDEV_NESTED_FIRST 1 84 #define CDEV_NESTED_SECOND 2 85 86 /* 87 * SECTION: MACROs for klogd and s390 debug feature (dbf) 88 */ 89 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ 90 do { \ 91 debug_sprintf_event(d_device->debug_area, \ 92 d_level, \ 93 d_str "\n", \ 94 d_data); \ 95 } while(0) 96 97 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \ 98 do { \ 99 debug_sprintf_exception(d_device->debug_area, \ 100 d_level, \ 101 d_str "\n", \ 102 d_data); \ 103 } while(0) 104 105 #define DBF_EVENT(d_level, d_str, d_data...)\ 106 do { \ 107 debug_sprintf_event(dasd_debug_area, \ 108 d_level,\ 109 d_str "\n", \ 110 d_data); \ 111 } while(0) 112 113 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \ 114 do { \ 115 struct ccw_dev_id __dev_id; \ 116 ccw_device_get_id(d_cdev, &__dev_id); \ 117 debug_sprintf_event(dasd_debug_area, \ 118 d_level, \ 119 "0.%x.%04x " d_str "\n", \ 120 __dev_id.ssid, __dev_id.devno, d_data); \ 121 } while (0) 122 123 #define DBF_EXC(d_level, d_str, d_data...)\ 124 do { \ 125 debug_sprintf_exception(dasd_debug_area, \ 126 d_level,\ 127 d_str "\n", \ 128 d_data); \ 129 } while(0) 130 131 /* limit size for an errorstring */ 132 #define ERRORLENGTH 30 133 134 /* definition of dbf debug levels */ 135 #define DBF_EMERG 0 /* system is unusable */ 136 #define DBF_ALERT 1 /* action must be taken immediately */ 137 #define DBF_CRIT 2 /* critical conditions */ 138 #define DBF_ERR 3 /* error conditions */ 139 #define DBF_WARNING 4 /* warning conditions */ 140 #define DBF_NOTICE 5 /* normal but significant condition */ 141 #define DBF_INFO 6 /* informational */ 142 #define DBF_DEBUG 6 /* debug-level messages */ 143 144 /* messages to be written via klogd and dbf */ 145 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ 146 do { \ 147 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 148 dev_name(&d_device->cdev->dev), d_args); \ 149 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ 150 } while(0) 151 152 #define MESSAGE(d_loglevel,d_string,d_args...)\ 153 do { \ 154 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 155 DBF_EVENT(DBF_ALERT, d_string, d_args); \ 156 } while(0) 157 158 /* messages to be written via klogd only */ 159 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ 160 do { \ 161 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 162 dev_name(&d_device->cdev->dev), d_args); \ 163 } while(0) 164 165 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ 166 do { \ 167 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 168 } while(0) 169 170 struct dasd_ccw_req { 171 unsigned int magic; /* Eye catcher */ 172 struct list_head devlist; /* for dasd_device request queue */ 173 struct list_head blocklist; /* for dasd_block request queue */ 174 175 /* Where to execute what... */ 176 struct dasd_block *block; /* the originating block device */ 177 struct dasd_device *memdev; /* the device used to allocate this */ 178 struct dasd_device *startdev; /* device the request is started on */ 179 void *cpaddr; /* address of ccw or tcw */ 180 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ 181 char status; /* status of this request */ 182 short retries; /* A retry counter */ 183 unsigned long flags; /* flags of this request */ 184 185 /* ... and how */ 186 unsigned long starttime; /* jiffies time of request start */ 187 unsigned long expires; /* expiration period in jiffies */ 188 char lpm; /* logical path mask */ 189 void *data; /* pointer to data area */ 190 191 /* these are important for recovering erroneous requests */ 192 int intrc; /* internal error, e.g. from start_IO */ 193 struct irb irb; /* device status in case of an error */ 194 struct dasd_ccw_req *refers; /* ERP-chain queueing. */ 195 void *function; /* originating ERP action */ 196 197 /* these are for statistics only */ 198 unsigned long long buildclk; /* TOD-clock of request generation */ 199 unsigned long long startclk; /* TOD-clock of request start */ 200 unsigned long long stopclk; /* TOD-clock of request interrupt */ 201 unsigned long long endclk; /* TOD-clock of request termination */ 202 203 /* Callback that is called after reaching final status. */ 204 void (*callback)(struct dasd_ccw_req *, void *data); 205 void *callback_data; 206 }; 207 208 /* 209 * dasd_ccw_req -> status can be: 210 */ 211 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ 212 #define DASD_CQR_DONE 0x01 /* request is completed successfully */ 213 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */ 214 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */ 215 #define DASD_CQR_FAILED 0x04 /* request is finally failed */ 216 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */ 217 218 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */ 219 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */ 220 #define DASD_CQR_ERROR 0x82 /* request is completed with error */ 221 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */ 222 #define DASD_CQR_CLEARED 0x84 /* request was cleared */ 223 #define DASD_CQR_SUCCESS 0x85 /* request was successful */ 224 225 /* default expiration time*/ 226 #define DASD_EXPIRES 300 227 #define DASD_EXPIRES_MAX 40000000 228 229 /* per dasd_ccw_req flags */ 230 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ 231 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ 232 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */ 233 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was 234 * stolen. Should not be combined with 235 * DASD_CQR_FLAGS_USE_ERP 236 */ 237 238 /* Signature for error recovery functions. */ 239 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 240 241 /* 242 * Unique identifier for dasd device. 243 */ 244 #define UA_NOT_CONFIGURED 0x00 245 #define UA_BASE_DEVICE 0x01 246 #define UA_BASE_PAV_ALIAS 0x02 247 #define UA_HYPER_PAV_ALIAS 0x03 248 249 struct dasd_uid { 250 __u8 type; 251 char vendor[4]; 252 char serial[15]; 253 __u16 ssid; 254 __u8 real_unit_addr; 255 __u8 base_unit_addr; 256 char vduit[33]; 257 }; 258 259 /* 260 * the struct dasd_discipline is 261 * sth like a table of virtual functions, if you think of dasd_eckd 262 * inheriting dasd... 263 * no, currently we are not planning to reimplement the driver in C++ 264 */ 265 struct dasd_discipline { 266 struct module *owner; 267 char ebcname[8]; /* a name used for tagging and printks */ 268 char name[8]; /* a name used for tagging and printks */ 269 int max_blocks; /* maximum number of blocks to be chained */ 270 271 struct list_head list; /* used for list of disciplines */ 272 273 /* 274 * Device recognition functions. check_device is used to verify 275 * the sense data and the information returned by read device 276 * characteristics. It returns 0 if the discipline can be used 277 * for the device in question. uncheck_device is called during 278 * device shutdown to deregister a device from its discipline. 279 */ 280 int (*check_device) (struct dasd_device *); 281 void (*uncheck_device) (struct dasd_device *); 282 283 /* 284 * do_analysis is used in the step from device state "basic" to 285 * state "accept". It returns 0 if the device can be made ready, 286 * it returns -EMEDIUMTYPE if the device can't be made ready or 287 * -EAGAIN if do_analysis started a ccw that needs to complete 288 * before the analysis may be repeated. 289 */ 290 int (*do_analysis) (struct dasd_block *); 291 292 /* 293 * This function is called, when new paths become available. 294 * Disciplins may use this callback to do necessary setup work, 295 * e.g. verify that new path is compatible with the current 296 * configuration. 297 */ 298 int (*verify_path)(struct dasd_device *, __u8); 299 300 /* 301 * Last things to do when a device is set online, and first things 302 * when it is set offline. 303 */ 304 int (*ready_to_online) (struct dasd_device *); 305 int (*online_to_ready) (struct dasd_device *); 306 307 /* 308 * Device operation functions. build_cp creates a ccw chain for 309 * a block device request, start_io starts the request and 310 * term_IO cancels it (e.g. in case of a timeout). format_device 311 * returns a ccw chain to be used to format the device. 312 * handle_terminated_request allows to examine a cqr and prepare 313 * it for retry. 314 */ 315 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 316 struct dasd_block *, 317 struct request *); 318 int (*start_IO) (struct dasd_ccw_req *); 319 int (*term_IO) (struct dasd_ccw_req *); 320 void (*handle_terminated_request) (struct dasd_ccw_req *); 321 struct dasd_ccw_req *(*format_device) (struct dasd_device *, 322 struct format_data_t *); 323 int (*free_cp) (struct dasd_ccw_req *, struct request *); 324 325 /* 326 * Error recovery functions. examine_error() returns a value that 327 * indicates what to do for an error condition. If examine_error() 328 * returns 'dasd_era_recover' erp_action() is called to create a 329 * special error recovery ccw. erp_postaction() is called after 330 * an error recovery ccw has finished its execution. dump_sense 331 * is called for every error condition to print the sense data 332 * to the console. 333 */ 334 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 335 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 336 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 337 struct irb *); 338 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 339 void (*check_for_device_change) (struct dasd_device *, 340 struct dasd_ccw_req *, 341 struct irb *); 342 343 /* i/o control functions. */ 344 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 345 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 346 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 347 348 /* suspend/resume functions */ 349 int (*freeze) (struct dasd_device *); 350 int (*restore) (struct dasd_device *); 351 352 /* reload device after state change */ 353 int (*reload) (struct dasd_device *); 354 355 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 356 void (*kick_validate) (struct dasd_device *); 357 }; 358 359 extern struct dasd_discipline *dasd_diag_discipline_pointer; 360 361 /* 362 * Notification numbers for extended error reporting notifications: 363 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 364 * eer pointer) is freed. The error reporting module needs to do all necessary 365 * cleanup steps. 366 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 367 */ 368 #define DASD_EER_DISABLE 0 369 #define DASD_EER_TRIGGER 1 370 371 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 372 #define DASD_EER_FATALERROR 1 373 #define DASD_EER_NOPATH 2 374 #define DASD_EER_STATECHANGE 3 375 #define DASD_EER_PPRCSUSPEND 4 376 377 struct dasd_path { 378 __u8 opm; 379 __u8 tbvpm; 380 __u8 ppm; 381 __u8 npm; 382 }; 383 384 struct dasd_profile_info { 385 /* legacy part of profile data, as in dasd_profile_info_t */ 386 unsigned int dasd_io_reqs; /* number of requests processed */ 387 unsigned int dasd_io_sects; /* number of sectors processed */ 388 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 389 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 390 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 391 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 392 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 393 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 394 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 395 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 396 397 /* new data */ 398 struct timespec starttod; /* time of start or last reset */ 399 unsigned int dasd_io_alias; /* requests using an alias */ 400 unsigned int dasd_io_tpm; /* requests using transport mode */ 401 unsigned int dasd_read_reqs; /* total number of read requests */ 402 unsigned int dasd_read_sects; /* total number read sectors */ 403 unsigned int dasd_read_alias; /* read request using an alias */ 404 unsigned int dasd_read_tpm; /* read requests in transport mode */ 405 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 406 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 407 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 408 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 409 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 410 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 411 }; 412 413 struct dasd_profile { 414 struct dentry *dentry; 415 struct dasd_profile_info *data; 416 spinlock_t lock; 417 }; 418 419 struct dasd_device { 420 /* Block device stuff. */ 421 struct dasd_block *block; 422 423 unsigned int devindex; 424 unsigned long flags; /* per device flags */ 425 unsigned short features; /* copy of devmap-features (read-only!) */ 426 427 /* extended error reporting stuff (eer) */ 428 struct dasd_ccw_req *eer_cqr; 429 430 /* Device discipline stuff. */ 431 struct dasd_discipline *discipline; 432 struct dasd_discipline *base_discipline; 433 char *private; 434 struct dasd_path path_data; 435 436 /* Device state and target state. */ 437 int state, target; 438 struct mutex state_mutex; 439 int stopped; /* device (ccw_device_start) was stopped */ 440 441 /* reference count. */ 442 atomic_t ref_count; 443 444 /* ccw queue and memory for static ccw/erp buffers. */ 445 struct list_head ccw_queue; 446 spinlock_t mem_lock; 447 void *ccw_mem; 448 void *erp_mem; 449 struct list_head ccw_chunks; 450 struct list_head erp_chunks; 451 452 atomic_t tasklet_scheduled; 453 struct tasklet_struct tasklet; 454 struct work_struct kick_work; 455 struct work_struct restore_device; 456 struct work_struct reload_device; 457 struct work_struct kick_validate; 458 struct timer_list timer; 459 460 debug_info_t *debug_area; 461 462 struct ccw_device *cdev; 463 464 /* hook for alias management */ 465 struct list_head alias_list; 466 467 /* default expiration time in s */ 468 unsigned long default_expires; 469 470 struct dentry *debugfs_dentry; 471 struct dasd_profile profile; 472 }; 473 474 struct dasd_block { 475 /* Block device stuff. */ 476 struct gendisk *gdp; 477 struct request_queue *request_queue; 478 spinlock_t request_queue_lock; 479 struct block_device *bdev; 480 atomic_t open_count; 481 482 unsigned long long blocks; /* size of volume in blocks */ 483 unsigned int bp_block; /* bytes per block */ 484 unsigned int s2b_shift; /* log2 (bp_block/512) */ 485 486 struct dasd_device *base; 487 struct list_head ccw_queue; 488 spinlock_t queue_lock; 489 490 atomic_t tasklet_scheduled; 491 struct tasklet_struct tasklet; 492 struct timer_list timer; 493 494 struct dentry *debugfs_dentry; 495 struct dasd_profile profile; 496 }; 497 498 499 500 /* reasons why device (ccw_device_start) was stopped */ 501 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 502 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 503 #define DASD_STOPPED_PENDING 4 /* long busy */ 504 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 505 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 506 #define DASD_STOPPED_PM 32 /* pm state transition */ 507 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 508 509 /* per device flags */ 510 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 511 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 512 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 513 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 514 * confuse this with the user specified 515 * read-only feature. 516 */ 517 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 518 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 519 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 520 521 522 void dasd_put_device_wake(struct dasd_device *); 523 524 /* 525 * Reference count inliners 526 */ 527 static inline void 528 dasd_get_device(struct dasd_device *device) 529 { 530 atomic_inc(&device->ref_count); 531 } 532 533 static inline void 534 dasd_put_device(struct dasd_device *device) 535 { 536 if (atomic_dec_return(&device->ref_count) == 0) 537 dasd_put_device_wake(device); 538 } 539 540 /* 541 * The static memory in ccw_mem and erp_mem is managed by a sorted 542 * list of free memory chunks. 543 */ 544 struct dasd_mchunk 545 { 546 struct list_head list; 547 unsigned long size; 548 } __attribute__ ((aligned(8))); 549 550 static inline void 551 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 552 unsigned long size) 553 { 554 struct dasd_mchunk *chunk; 555 556 INIT_LIST_HEAD(chunk_list); 557 chunk = (struct dasd_mchunk *) mem; 558 chunk->size = size - sizeof(struct dasd_mchunk); 559 list_add(&chunk->list, chunk_list); 560 } 561 562 static inline void * 563 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 564 { 565 struct dasd_mchunk *chunk, *tmp; 566 567 size = (size + 7L) & -8L; 568 list_for_each_entry(chunk, chunk_list, list) { 569 if (chunk->size < size) 570 continue; 571 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 572 char *endaddr = (char *) (chunk + 1) + chunk->size; 573 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 574 tmp->size = size; 575 chunk->size -= size + sizeof(struct dasd_mchunk); 576 chunk = tmp; 577 } else 578 list_del(&chunk->list); 579 return (void *) (chunk + 1); 580 } 581 return NULL; 582 } 583 584 static inline void 585 dasd_free_chunk(struct list_head *chunk_list, void *mem) 586 { 587 struct dasd_mchunk *chunk, *tmp; 588 struct list_head *p, *left; 589 590 chunk = (struct dasd_mchunk *) 591 ((char *) mem - sizeof(struct dasd_mchunk)); 592 /* Find out the left neighbour in chunk_list. */ 593 left = chunk_list; 594 list_for_each(p, chunk_list) { 595 if (list_entry(p, struct dasd_mchunk, list) > chunk) 596 break; 597 left = p; 598 } 599 /* Try to merge with right neighbour = next element from left. */ 600 if (left->next != chunk_list) { 601 tmp = list_entry(left->next, struct dasd_mchunk, list); 602 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 603 list_del(&tmp->list); 604 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 605 } 606 } 607 /* Try to merge with left neighbour. */ 608 if (left != chunk_list) { 609 tmp = list_entry(left, struct dasd_mchunk, list); 610 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 611 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 612 return; 613 } 614 } 615 __list_add(&chunk->list, left, left->next); 616 } 617 618 /* 619 * Check if bsize is in { 512, 1024, 2048, 4096 } 620 */ 621 static inline int 622 dasd_check_blocksize(int bsize) 623 { 624 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 625 return -EMEDIUMTYPE; 626 return 0; 627 } 628 629 /* externals in dasd.c */ 630 #define DASD_PROFILE_OFF 0 631 #define DASD_PROFILE_ON 1 632 #define DASD_PROFILE_GLOBAL_ONLY 2 633 634 extern debug_info_t *dasd_debug_area; 635 extern struct dasd_profile_info dasd_global_profile_data; 636 extern unsigned int dasd_global_profile_level; 637 extern const struct block_device_operations dasd_device_operations; 638 639 extern struct kmem_cache *dasd_page_cache; 640 641 struct dasd_ccw_req * 642 dasd_kmalloc_request(int , int, int, struct dasd_device *); 643 struct dasd_ccw_req * 644 dasd_smalloc_request(int , int, int, struct dasd_device *); 645 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 646 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 647 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 648 649 static inline int 650 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 651 { 652 return set_normalized_cda(ccw, cda); 653 } 654 655 struct dasd_device *dasd_alloc_device(void); 656 void dasd_free_device(struct dasd_device *); 657 658 struct dasd_block *dasd_alloc_block(void); 659 void dasd_free_block(struct dasd_block *); 660 661 void dasd_enable_device(struct dasd_device *); 662 void dasd_set_target_state(struct dasd_device *, int); 663 void dasd_kick_device(struct dasd_device *); 664 void dasd_restore_device(struct dasd_device *); 665 void dasd_reload_device(struct dasd_device *); 666 667 void dasd_add_request_head(struct dasd_ccw_req *); 668 void dasd_add_request_tail(struct dasd_ccw_req *); 669 int dasd_start_IO(struct dasd_ccw_req *); 670 int dasd_term_IO(struct dasd_ccw_req *); 671 void dasd_schedule_device_bh(struct dasd_device *); 672 void dasd_schedule_block_bh(struct dasd_block *); 673 int dasd_sleep_on(struct dasd_ccw_req *); 674 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 675 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 676 void dasd_device_set_timer(struct dasd_device *, int); 677 void dasd_device_clear_timer(struct dasd_device *); 678 void dasd_block_set_timer(struct dasd_block *, int); 679 void dasd_block_clear_timer(struct dasd_block *); 680 int dasd_cancel_req(struct dasd_ccw_req *); 681 int dasd_flush_device_queue(struct dasd_device *); 682 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 683 void dasd_generic_remove (struct ccw_device *cdev); 684 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 685 int dasd_generic_set_offline (struct ccw_device *cdev); 686 int dasd_generic_notify(struct ccw_device *, int); 687 int dasd_generic_last_path_gone(struct dasd_device *); 688 int dasd_generic_path_operational(struct dasd_device *); 689 690 void dasd_generic_handle_state_change(struct dasd_device *); 691 int dasd_generic_pm_freeze(struct ccw_device *); 692 int dasd_generic_restore_device(struct ccw_device *); 693 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 694 void dasd_generic_path_event(struct ccw_device *, int *); 695 int dasd_generic_verify_path(struct dasd_device *, __u8); 696 697 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 698 char *dasd_get_sense(struct irb *); 699 700 void dasd_device_set_stop_bits(struct dasd_device *, int); 701 void dasd_device_remove_stop_bits(struct dasd_device *, int); 702 703 int dasd_device_is_ro(struct dasd_device *); 704 705 void dasd_profile_reset(struct dasd_profile *); 706 int dasd_profile_on(struct dasd_profile *); 707 void dasd_profile_off(struct dasd_profile *); 708 void dasd_global_profile_reset(void); 709 char *dasd_get_user_string(const char __user *, size_t); 710 711 /* externals in dasd_devmap.c */ 712 extern int dasd_max_devindex; 713 extern int dasd_probeonly; 714 extern int dasd_autodetect; 715 extern int dasd_nopav; 716 extern int dasd_nofcx; 717 718 int dasd_devmap_init(void); 719 void dasd_devmap_exit(void); 720 721 struct dasd_device *dasd_create_device(struct ccw_device *); 722 void dasd_delete_device(struct dasd_device *); 723 724 int dasd_get_feature(struct ccw_device *, int); 725 int dasd_set_feature(struct ccw_device *, int, int); 726 727 int dasd_add_sysfs_files(struct ccw_device *); 728 void dasd_remove_sysfs_files(struct ccw_device *); 729 730 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 731 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 732 struct dasd_device *dasd_device_from_devindex(int); 733 734 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 735 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 736 737 int dasd_parse(void); 738 int dasd_busid_known(const char *); 739 740 /* externals in dasd_gendisk.c */ 741 int dasd_gendisk_init(void); 742 void dasd_gendisk_exit(void); 743 int dasd_gendisk_alloc(struct dasd_block *); 744 void dasd_gendisk_free(struct dasd_block *); 745 int dasd_scan_partitions(struct dasd_block *); 746 void dasd_destroy_partitions(struct dasd_block *); 747 748 /* externals in dasd_ioctl.c */ 749 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 750 751 /* externals in dasd_proc.c */ 752 int dasd_proc_init(void); 753 void dasd_proc_exit(void); 754 755 /* externals in dasd_erp.c */ 756 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 757 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 758 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 759 struct dasd_device *); 760 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 761 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 762 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 763 764 /* externals in dasd_3990_erp.c */ 765 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 766 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 767 768 /* externals in dasd_eer.c */ 769 #ifdef CONFIG_DASD_EER 770 int dasd_eer_init(void); 771 void dasd_eer_exit(void); 772 int dasd_eer_enable(struct dasd_device *); 773 void dasd_eer_disable(struct dasd_device *); 774 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 775 unsigned int id); 776 void dasd_eer_snss(struct dasd_device *); 777 778 static inline int dasd_eer_enabled(struct dasd_device *device) 779 { 780 return device->eer_cqr != NULL; 781 } 782 #else 783 #define dasd_eer_init() (0) 784 #define dasd_eer_exit() do { } while (0) 785 #define dasd_eer_enable(d) (0) 786 #define dasd_eer_disable(d) do { } while (0) 787 #define dasd_eer_write(d,c,i) do { } while (0) 788 #define dasd_eer_snss(d) do { } while (0) 789 #define dasd_eer_enabled(d) (0) 790 #endif /* CONFIG_DASD_ERR */ 791 792 #endif /* DASD_H */ 793