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 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */ 235 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was 236 * stolen. Should not be combined with 237 * DASD_CQR_FLAGS_USE_ERP 238 */ 239 240 /* Signature for error recovery functions. */ 241 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 242 243 /* 244 * Unique identifier for dasd device. 245 */ 246 #define UA_NOT_CONFIGURED 0x00 247 #define UA_BASE_DEVICE 0x01 248 #define UA_BASE_PAV_ALIAS 0x02 249 #define UA_HYPER_PAV_ALIAS 0x03 250 251 struct dasd_uid { 252 __u8 type; 253 char vendor[4]; 254 char serial[15]; 255 __u16 ssid; 256 __u8 real_unit_addr; 257 __u8 base_unit_addr; 258 char vduit[33]; 259 }; 260 261 /* 262 * the struct dasd_discipline is 263 * sth like a table of virtual functions, if you think of dasd_eckd 264 * inheriting dasd... 265 * no, currently we are not planning to reimplement the driver in C++ 266 */ 267 struct dasd_discipline { 268 struct module *owner; 269 char ebcname[8]; /* a name used for tagging and printks */ 270 char name[8]; /* a name used for tagging and printks */ 271 int max_blocks; /* maximum number of blocks to be chained */ 272 273 struct list_head list; /* used for list of disciplines */ 274 275 /* 276 * Device recognition functions. check_device is used to verify 277 * the sense data and the information returned by read device 278 * characteristics. It returns 0 if the discipline can be used 279 * for the device in question. uncheck_device is called during 280 * device shutdown to deregister a device from its discipline. 281 */ 282 int (*check_device) (struct dasd_device *); 283 void (*uncheck_device) (struct dasd_device *); 284 285 /* 286 * do_analysis is used in the step from device state "basic" to 287 * state "accept". It returns 0 if the device can be made ready, 288 * it returns -EMEDIUMTYPE if the device can't be made ready or 289 * -EAGAIN if do_analysis started a ccw that needs to complete 290 * before the analysis may be repeated. 291 */ 292 int (*do_analysis) (struct dasd_block *); 293 294 /* 295 * This function is called, when new paths become available. 296 * Disciplins may use this callback to do necessary setup work, 297 * e.g. verify that new path is compatible with the current 298 * configuration. 299 */ 300 int (*verify_path)(struct dasd_device *, __u8); 301 302 /* 303 * Last things to do when a device is set online, and first things 304 * when it is set offline. 305 */ 306 int (*ready_to_online) (struct dasd_device *); 307 int (*online_to_ready) (struct dasd_device *); 308 309 /* 310 * Device operation functions. build_cp creates a ccw chain for 311 * a block device request, start_io starts the request and 312 * term_IO cancels it (e.g. in case of a timeout). format_device 313 * returns a ccw chain to be used to format the device. 314 * handle_terminated_request allows to examine a cqr and prepare 315 * it for retry. 316 */ 317 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 318 struct dasd_block *, 319 struct request *); 320 int (*start_IO) (struct dasd_ccw_req *); 321 int (*term_IO) (struct dasd_ccw_req *); 322 void (*handle_terminated_request) (struct dasd_ccw_req *); 323 struct dasd_ccw_req *(*format_device) (struct dasd_device *, 324 struct format_data_t *); 325 int (*free_cp) (struct dasd_ccw_req *, struct request *); 326 327 /* 328 * Error recovery functions. examine_error() returns a value that 329 * indicates what to do for an error condition. If examine_error() 330 * returns 'dasd_era_recover' erp_action() is called to create a 331 * special error recovery ccw. erp_postaction() is called after 332 * an error recovery ccw has finished its execution. dump_sense 333 * is called for every error condition to print the sense data 334 * to the console. 335 */ 336 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 337 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 338 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 339 struct irb *); 340 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 341 void (*check_for_device_change) (struct dasd_device *, 342 struct dasd_ccw_req *, 343 struct irb *); 344 345 /* i/o control functions. */ 346 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 347 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 348 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 349 350 /* suspend/resume functions */ 351 int (*freeze) (struct dasd_device *); 352 int (*restore) (struct dasd_device *); 353 354 /* reload device after state change */ 355 int (*reload) (struct dasd_device *); 356 357 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 358 void (*kick_validate) (struct dasd_device *); 359 }; 360 361 extern struct dasd_discipline *dasd_diag_discipline_pointer; 362 363 /* 364 * Notification numbers for extended error reporting notifications: 365 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 366 * eer pointer) is freed. The error reporting module needs to do all necessary 367 * cleanup steps. 368 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 369 */ 370 #define DASD_EER_DISABLE 0 371 #define DASD_EER_TRIGGER 1 372 373 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 374 #define DASD_EER_FATALERROR 1 375 #define DASD_EER_NOPATH 2 376 #define DASD_EER_STATECHANGE 3 377 #define DASD_EER_PPRCSUSPEND 4 378 379 struct dasd_path { 380 __u8 opm; 381 __u8 tbvpm; 382 __u8 ppm; 383 __u8 npm; 384 }; 385 386 struct dasd_profile_info { 387 /* legacy part of profile data, as in dasd_profile_info_t */ 388 unsigned int dasd_io_reqs; /* number of requests processed */ 389 unsigned int dasd_io_sects; /* number of sectors processed */ 390 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 391 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 392 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 393 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 394 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 395 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 396 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 397 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 398 399 /* new data */ 400 struct timespec starttod; /* time of start or last reset */ 401 unsigned int dasd_io_alias; /* requests using an alias */ 402 unsigned int dasd_io_tpm; /* requests using transport mode */ 403 unsigned int dasd_read_reqs; /* total number of read requests */ 404 unsigned int dasd_read_sects; /* total number read sectors */ 405 unsigned int dasd_read_alias; /* read request using an alias */ 406 unsigned int dasd_read_tpm; /* read requests in transport mode */ 407 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 408 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 409 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 410 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 411 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 412 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 413 }; 414 415 struct dasd_profile { 416 struct dentry *dentry; 417 struct dasd_profile_info *data; 418 spinlock_t lock; 419 }; 420 421 struct dasd_device { 422 /* Block device stuff. */ 423 struct dasd_block *block; 424 425 unsigned int devindex; 426 unsigned long flags; /* per device flags */ 427 unsigned short features; /* copy of devmap-features (read-only!) */ 428 429 /* extended error reporting stuff (eer) */ 430 struct dasd_ccw_req *eer_cqr; 431 432 /* Device discipline stuff. */ 433 struct dasd_discipline *discipline; 434 struct dasd_discipline *base_discipline; 435 char *private; 436 struct dasd_path path_data; 437 438 /* Device state and target state. */ 439 int state, target; 440 struct mutex state_mutex; 441 int stopped; /* device (ccw_device_start) was stopped */ 442 443 /* reference count. */ 444 atomic_t ref_count; 445 446 /* ccw queue and memory for static ccw/erp buffers. */ 447 struct list_head ccw_queue; 448 spinlock_t mem_lock; 449 void *ccw_mem; 450 void *erp_mem; 451 struct list_head ccw_chunks; 452 struct list_head erp_chunks; 453 454 atomic_t tasklet_scheduled; 455 struct tasklet_struct tasklet; 456 struct work_struct kick_work; 457 struct work_struct restore_device; 458 struct work_struct reload_device; 459 struct work_struct kick_validate; 460 struct timer_list timer; 461 462 debug_info_t *debug_area; 463 464 struct ccw_device *cdev; 465 466 /* hook for alias management */ 467 struct list_head alias_list; 468 469 /* default expiration time in s */ 470 unsigned long default_expires; 471 472 struct dentry *debugfs_dentry; 473 struct dasd_profile profile; 474 }; 475 476 struct dasd_block { 477 /* Block device stuff. */ 478 struct gendisk *gdp; 479 struct request_queue *request_queue; 480 spinlock_t request_queue_lock; 481 struct block_device *bdev; 482 atomic_t open_count; 483 484 unsigned long long blocks; /* size of volume in blocks */ 485 unsigned int bp_block; /* bytes per block */ 486 unsigned int s2b_shift; /* log2 (bp_block/512) */ 487 488 struct dasd_device *base; 489 struct list_head ccw_queue; 490 spinlock_t queue_lock; 491 492 atomic_t tasklet_scheduled; 493 struct tasklet_struct tasklet; 494 struct timer_list timer; 495 496 struct dentry *debugfs_dentry; 497 struct dasd_profile profile; 498 }; 499 500 501 502 /* reasons why device (ccw_device_start) was stopped */ 503 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 504 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 505 #define DASD_STOPPED_PENDING 4 /* long busy */ 506 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 507 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 508 #define DASD_STOPPED_PM 32 /* pm state transition */ 509 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 510 511 /* per device flags */ 512 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 513 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 514 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 515 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 516 * confuse this with the user specified 517 * read-only feature. 518 */ 519 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 520 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 521 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 522 523 524 void dasd_put_device_wake(struct dasd_device *); 525 526 /* 527 * Reference count inliners 528 */ 529 static inline void 530 dasd_get_device(struct dasd_device *device) 531 { 532 atomic_inc(&device->ref_count); 533 } 534 535 static inline void 536 dasd_put_device(struct dasd_device *device) 537 { 538 if (atomic_dec_return(&device->ref_count) == 0) 539 dasd_put_device_wake(device); 540 } 541 542 /* 543 * The static memory in ccw_mem and erp_mem is managed by a sorted 544 * list of free memory chunks. 545 */ 546 struct dasd_mchunk 547 { 548 struct list_head list; 549 unsigned long size; 550 } __attribute__ ((aligned(8))); 551 552 static inline void 553 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 554 unsigned long size) 555 { 556 struct dasd_mchunk *chunk; 557 558 INIT_LIST_HEAD(chunk_list); 559 chunk = (struct dasd_mchunk *) mem; 560 chunk->size = size - sizeof(struct dasd_mchunk); 561 list_add(&chunk->list, chunk_list); 562 } 563 564 static inline void * 565 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 566 { 567 struct dasd_mchunk *chunk, *tmp; 568 569 size = (size + 7L) & -8L; 570 list_for_each_entry(chunk, chunk_list, list) { 571 if (chunk->size < size) 572 continue; 573 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 574 char *endaddr = (char *) (chunk + 1) + chunk->size; 575 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 576 tmp->size = size; 577 chunk->size -= size + sizeof(struct dasd_mchunk); 578 chunk = tmp; 579 } else 580 list_del(&chunk->list); 581 return (void *) (chunk + 1); 582 } 583 return NULL; 584 } 585 586 static inline void 587 dasd_free_chunk(struct list_head *chunk_list, void *mem) 588 { 589 struct dasd_mchunk *chunk, *tmp; 590 struct list_head *p, *left; 591 592 chunk = (struct dasd_mchunk *) 593 ((char *) mem - sizeof(struct dasd_mchunk)); 594 /* Find out the left neighbour in chunk_list. */ 595 left = chunk_list; 596 list_for_each(p, chunk_list) { 597 if (list_entry(p, struct dasd_mchunk, list) > chunk) 598 break; 599 left = p; 600 } 601 /* Try to merge with right neighbour = next element from left. */ 602 if (left->next != chunk_list) { 603 tmp = list_entry(left->next, struct dasd_mchunk, list); 604 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 605 list_del(&tmp->list); 606 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 607 } 608 } 609 /* Try to merge with left neighbour. */ 610 if (left != chunk_list) { 611 tmp = list_entry(left, struct dasd_mchunk, list); 612 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 613 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 614 return; 615 } 616 } 617 __list_add(&chunk->list, left, left->next); 618 } 619 620 /* 621 * Check if bsize is in { 512, 1024, 2048, 4096 } 622 */ 623 static inline int 624 dasd_check_blocksize(int bsize) 625 { 626 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 627 return -EMEDIUMTYPE; 628 return 0; 629 } 630 631 /* externals in dasd.c */ 632 #define DASD_PROFILE_OFF 0 633 #define DASD_PROFILE_ON 1 634 #define DASD_PROFILE_GLOBAL_ONLY 2 635 636 extern debug_info_t *dasd_debug_area; 637 extern struct dasd_profile_info dasd_global_profile_data; 638 extern unsigned int dasd_global_profile_level; 639 extern const struct block_device_operations dasd_device_operations; 640 641 extern struct kmem_cache *dasd_page_cache; 642 643 struct dasd_ccw_req * 644 dasd_kmalloc_request(int , int, int, struct dasd_device *); 645 struct dasd_ccw_req * 646 dasd_smalloc_request(int , int, int, struct dasd_device *); 647 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 648 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 649 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 650 651 static inline int 652 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 653 { 654 return set_normalized_cda(ccw, cda); 655 } 656 657 struct dasd_device *dasd_alloc_device(void); 658 void dasd_free_device(struct dasd_device *); 659 660 struct dasd_block *dasd_alloc_block(void); 661 void dasd_free_block(struct dasd_block *); 662 663 void dasd_enable_device(struct dasd_device *); 664 void dasd_set_target_state(struct dasd_device *, int); 665 void dasd_kick_device(struct dasd_device *); 666 void dasd_restore_device(struct dasd_device *); 667 void dasd_reload_device(struct dasd_device *); 668 669 void dasd_add_request_head(struct dasd_ccw_req *); 670 void dasd_add_request_tail(struct dasd_ccw_req *); 671 int dasd_start_IO(struct dasd_ccw_req *); 672 int dasd_term_IO(struct dasd_ccw_req *); 673 void dasd_schedule_device_bh(struct dasd_device *); 674 void dasd_schedule_block_bh(struct dasd_block *); 675 int dasd_sleep_on(struct dasd_ccw_req *); 676 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 677 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 678 void dasd_device_set_timer(struct dasd_device *, int); 679 void dasd_device_clear_timer(struct dasd_device *); 680 void dasd_block_set_timer(struct dasd_block *, int); 681 void dasd_block_clear_timer(struct dasd_block *); 682 int dasd_cancel_req(struct dasd_ccw_req *); 683 int dasd_flush_device_queue(struct dasd_device *); 684 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 685 void dasd_generic_remove (struct ccw_device *cdev); 686 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 687 int dasd_generic_set_offline (struct ccw_device *cdev); 688 int dasd_generic_notify(struct ccw_device *, int); 689 int dasd_generic_last_path_gone(struct dasd_device *); 690 int dasd_generic_path_operational(struct dasd_device *); 691 692 void dasd_generic_handle_state_change(struct dasd_device *); 693 int dasd_generic_pm_freeze(struct ccw_device *); 694 int dasd_generic_restore_device(struct ccw_device *); 695 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 696 void dasd_generic_path_event(struct ccw_device *, int *); 697 int dasd_generic_verify_path(struct dasd_device *, __u8); 698 699 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 700 char *dasd_get_sense(struct irb *); 701 702 void dasd_device_set_stop_bits(struct dasd_device *, int); 703 void dasd_device_remove_stop_bits(struct dasd_device *, int); 704 705 int dasd_device_is_ro(struct dasd_device *); 706 707 void dasd_profile_reset(struct dasd_profile *); 708 int dasd_profile_on(struct dasd_profile *); 709 void dasd_profile_off(struct dasd_profile *); 710 void dasd_global_profile_reset(void); 711 char *dasd_get_user_string(const char __user *, size_t); 712 713 /* externals in dasd_devmap.c */ 714 extern int dasd_max_devindex; 715 extern int dasd_probeonly; 716 extern int dasd_autodetect; 717 extern int dasd_nopav; 718 extern int dasd_nofcx; 719 720 int dasd_devmap_init(void); 721 void dasd_devmap_exit(void); 722 723 struct dasd_device *dasd_create_device(struct ccw_device *); 724 void dasd_delete_device(struct dasd_device *); 725 726 int dasd_get_feature(struct ccw_device *, int); 727 int dasd_set_feature(struct ccw_device *, int, int); 728 729 int dasd_add_sysfs_files(struct ccw_device *); 730 void dasd_remove_sysfs_files(struct ccw_device *); 731 732 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 733 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 734 struct dasd_device *dasd_device_from_devindex(int); 735 736 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 737 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 738 739 int dasd_parse(void); 740 int dasd_busid_known(const char *); 741 742 /* externals in dasd_gendisk.c */ 743 int dasd_gendisk_init(void); 744 void dasd_gendisk_exit(void); 745 int dasd_gendisk_alloc(struct dasd_block *); 746 void dasd_gendisk_free(struct dasd_block *); 747 int dasd_scan_partitions(struct dasd_block *); 748 void dasd_destroy_partitions(struct dasd_block *); 749 750 /* externals in dasd_ioctl.c */ 751 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 752 753 /* externals in dasd_proc.c */ 754 int dasd_proc_init(void); 755 void dasd_proc_exit(void); 756 757 /* externals in dasd_erp.c */ 758 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 759 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 760 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 761 struct dasd_device *); 762 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 763 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 764 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 765 766 /* externals in dasd_3990_erp.c */ 767 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 768 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 769 770 /* externals in dasd_eer.c */ 771 #ifdef CONFIG_DASD_EER 772 int dasd_eer_init(void); 773 void dasd_eer_exit(void); 774 int dasd_eer_enable(struct dasd_device *); 775 void dasd_eer_disable(struct dasd_device *); 776 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 777 unsigned int id); 778 void dasd_eer_snss(struct dasd_device *); 779 780 static inline int dasd_eer_enabled(struct dasd_device *device) 781 { 782 return device->eer_cqr != NULL; 783 } 784 #else 785 #define dasd_eer_init() (0) 786 #define dasd_eer_exit() do { } while (0) 787 #define dasd_eer_enable(d) (0) 788 #define dasd_eer_disable(d) do { } while (0) 789 #define dasd_eer_write(d,c,i) do { } while (0) 790 #define dasd_eer_snss(d) do { } while (0) 791 #define dasd_eer_enabled(d) (0) 792 #endif /* CONFIG_DASD_ERR */ 793 794 #endif /* __KERNEL__ */ 795 796 #endif /* DASD_H */ 797