1 /* 2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 3 * Horst Hummel <Horst.Hummel@de.ibm.com> 4 * Martin Schwidefsky <schwidefsky@de.ibm.com> 5 * Bugreports.to..: <Linux390@de.ibm.com> 6 * Copyright IBM Corp. 1999, 2009 7 */ 8 9 #ifndef DASD_INT_H 10 #define DASD_INT_H 11 12 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */ 13 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS)) 14 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1) 15 16 /* 17 * States a dasd device can have: 18 * new: the dasd_device structure is allocated. 19 * known: the discipline for the device is identified. 20 * basic: the device can do basic i/o. 21 * unfmt: the device could not be analyzed (format is unknown). 22 * ready: partition detection is done and the device is can do block io. 23 * online: the device accepts requests from the block device queue. 24 * 25 * Things to do for startup state transitions: 26 * new -> known: find discipline for the device and create devfs entries. 27 * known -> basic: request irq line for the device. 28 * basic -> ready: do the initial analysis, e.g. format detection, 29 * do block device setup and detect partitions. 30 * ready -> online: schedule the device tasklet. 31 * Things to do for shutdown state transitions: 32 * online -> ready: just set the new device state. 33 * ready -> basic: flush requests from the block device layer, clear 34 * partition information and reset format information. 35 * basic -> known: terminate all requests and free irq. 36 * known -> new: remove devfs entries and forget discipline. 37 */ 38 39 #define DASD_STATE_NEW 0 40 #define DASD_STATE_KNOWN 1 41 #define DASD_STATE_BASIC 2 42 #define DASD_STATE_UNFMT 3 43 #define DASD_STATE_READY 4 44 #define DASD_STATE_ONLINE 5 45 46 #include <linux/module.h> 47 #include <linux/wait.h> 48 #include <linux/blkdev.h> 49 #include <linux/genhd.h> 50 #include <linux/hdreg.h> 51 #include <linux/interrupt.h> 52 #include <linux/log2.h> 53 #include <asm/ccwdev.h> 54 #include <linux/workqueue.h> 55 #include <asm/debug.h> 56 #include <asm/dasd.h> 57 #include <asm/idals.h> 58 59 /* DASD discipline magic */ 60 #define DASD_ECKD_MAGIC 0xC5C3D2C4 61 #define DASD_DIAG_MAGIC 0xC4C9C1C7 62 #define DASD_FBA_MAGIC 0xC6C2C140 63 64 /* 65 * SECTION: Type definitions 66 */ 67 struct dasd_device; 68 struct dasd_block; 69 70 /* BIT DEFINITIONS FOR SENSE DATA */ 71 #define DASD_SENSE_BIT_0 0x80 72 #define DASD_SENSE_BIT_1 0x40 73 #define DASD_SENSE_BIT_2 0x20 74 #define DASD_SENSE_BIT_3 0x10 75 76 /* BIT DEFINITIONS FOR SIM SENSE */ 77 #define DASD_SIM_SENSE 0x0F 78 #define DASD_SIM_MSG_TO_OP 0x03 79 #define DASD_SIM_LOG 0x0C 80 81 /* lock class for nested cdev lock */ 82 #define CDEV_NESTED_FIRST 1 83 #define CDEV_NESTED_SECOND 2 84 85 /* 86 * SECTION: MACROs for klogd and s390 debug feature (dbf) 87 */ 88 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ 89 do { \ 90 debug_sprintf_event(d_device->debug_area, \ 91 d_level, \ 92 d_str "\n", \ 93 d_data); \ 94 } while(0) 95 96 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \ 97 do { \ 98 debug_sprintf_exception(d_device->debug_area, \ 99 d_level, \ 100 d_str "\n", \ 101 d_data); \ 102 } while(0) 103 104 #define DBF_EVENT(d_level, d_str, d_data...)\ 105 do { \ 106 debug_sprintf_event(dasd_debug_area, \ 107 d_level,\ 108 d_str "\n", \ 109 d_data); \ 110 } while(0) 111 112 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \ 113 do { \ 114 struct ccw_dev_id __dev_id; \ 115 ccw_device_get_id(d_cdev, &__dev_id); \ 116 debug_sprintf_event(dasd_debug_area, \ 117 d_level, \ 118 "0.%x.%04x " d_str "\n", \ 119 __dev_id.ssid, __dev_id.devno, d_data); \ 120 } while (0) 121 122 #define DBF_EXC(d_level, d_str, d_data...)\ 123 do { \ 124 debug_sprintf_exception(dasd_debug_area, \ 125 d_level,\ 126 d_str "\n", \ 127 d_data); \ 128 } while(0) 129 130 /* limit size for an errorstring */ 131 #define ERRORLENGTH 30 132 133 /* definition of dbf debug levels */ 134 #define DBF_EMERG 0 /* system is unusable */ 135 #define DBF_ALERT 1 /* action must be taken immediately */ 136 #define DBF_CRIT 2 /* critical conditions */ 137 #define DBF_ERR 3 /* error conditions */ 138 #define DBF_WARNING 4 /* warning conditions */ 139 #define DBF_NOTICE 5 /* normal but significant condition */ 140 #define DBF_INFO 6 /* informational */ 141 #define DBF_DEBUG 6 /* debug-level messages */ 142 143 /* messages to be written via klogd and dbf */ 144 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ 145 do { \ 146 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 147 dev_name(&d_device->cdev->dev), d_args); \ 148 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ 149 } while(0) 150 151 #define MESSAGE(d_loglevel,d_string,d_args...)\ 152 do { \ 153 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 154 DBF_EVENT(DBF_ALERT, d_string, d_args); \ 155 } while(0) 156 157 /* messages to be written via klogd only */ 158 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ 159 do { \ 160 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 161 dev_name(&d_device->cdev->dev), d_args); \ 162 } while(0) 163 164 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ 165 do { \ 166 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 167 } while(0) 168 169 struct dasd_ccw_req { 170 unsigned int magic; /* Eye catcher */ 171 struct list_head devlist; /* for dasd_device request queue */ 172 struct list_head blocklist; /* for dasd_block request queue */ 173 174 /* Where to execute what... */ 175 struct dasd_block *block; /* the originating block device */ 176 struct dasd_device *memdev; /* the device used to allocate this */ 177 struct dasd_device *startdev; /* device the request is started on */ 178 struct dasd_device *basedev; /* base device if no block->base */ 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 #define DASD_RETRIES 256 229 #define DASD_RETRIES_MAX 32768 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 (*basic_to_ready) (struct dasd_device *); 307 int (*online_to_ready) (struct dasd_device *); 308 int (*basic_to_known)(struct dasd_device *); 309 310 /* (struct dasd_device *); 311 * Device operation functions. build_cp creates a ccw chain for 312 * a block device request, start_io starts the request and 313 * term_IO cancels it (e.g. in case of a timeout). format_device 314 * returns a ccw chain to be used to format the device. 315 * handle_terminated_request allows to examine a cqr and prepare 316 * it for retry. 317 */ 318 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 319 struct dasd_block *, 320 struct request *); 321 int (*start_IO) (struct dasd_ccw_req *); 322 int (*term_IO) (struct dasd_ccw_req *); 323 void (*handle_terminated_request) (struct dasd_ccw_req *); 324 int (*format_device) (struct dasd_device *, 325 struct format_data_t *, int enable_pav); 326 int (*free_cp) (struct dasd_ccw_req *, struct request *); 327 328 /* 329 * Error recovery functions. examine_error() returns a value that 330 * indicates what to do for an error condition. If examine_error() 331 * returns 'dasd_era_recover' erp_action() is called to create a 332 * special error recovery ccw. erp_postaction() is called after 333 * an error recovery ccw has finished its execution. dump_sense 334 * is called for every error condition to print the sense data 335 * to the console. 336 */ 337 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 338 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 339 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 340 struct irb *); 341 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 342 void (*check_for_device_change) (struct dasd_device *, 343 struct dasd_ccw_req *, 344 struct irb *); 345 346 /* i/o control functions. */ 347 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 348 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 349 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 350 351 /* suspend/resume functions */ 352 int (*freeze) (struct dasd_device *); 353 int (*restore) (struct dasd_device *); 354 355 /* reload device after state change */ 356 int (*reload) (struct dasd_device *); 357 358 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 359 void (*kick_validate) (struct dasd_device *); 360 }; 361 362 extern struct dasd_discipline *dasd_diag_discipline_pointer; 363 364 /* 365 * Notification numbers for extended error reporting notifications: 366 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 367 * eer pointer) is freed. The error reporting module needs to do all necessary 368 * cleanup steps. 369 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 370 */ 371 #define DASD_EER_DISABLE 0 372 #define DASD_EER_TRIGGER 1 373 374 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 375 #define DASD_EER_FATALERROR 1 376 #define DASD_EER_NOPATH 2 377 #define DASD_EER_STATECHANGE 3 378 #define DASD_EER_PPRCSUSPEND 4 379 380 struct dasd_path { 381 __u8 opm; 382 __u8 tbvpm; 383 __u8 ppm; 384 __u8 npm; 385 }; 386 387 struct dasd_profile_info { 388 /* legacy part of profile data, as in dasd_profile_info_t */ 389 unsigned int dasd_io_reqs; /* number of requests processed */ 390 unsigned int dasd_io_sects; /* number of sectors processed */ 391 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 392 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 393 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 394 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 395 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 396 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 397 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 398 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 399 400 /* new data */ 401 struct timespec starttod; /* time of start or last reset */ 402 unsigned int dasd_io_alias; /* requests using an alias */ 403 unsigned int dasd_io_tpm; /* requests using transport mode */ 404 unsigned int dasd_read_reqs; /* total number of read requests */ 405 unsigned int dasd_read_sects; /* total number read sectors */ 406 unsigned int dasd_read_alias; /* read request using an alias */ 407 unsigned int dasd_read_tpm; /* read requests in transport mode */ 408 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 409 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 410 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 411 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 412 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 413 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 414 }; 415 416 struct dasd_profile { 417 struct dentry *dentry; 418 struct dasd_profile_info *data; 419 spinlock_t lock; 420 }; 421 422 struct dasd_device { 423 /* Block device stuff. */ 424 struct dasd_block *block; 425 426 unsigned int devindex; 427 unsigned long flags; /* per device flags */ 428 unsigned short features; /* copy of devmap-features (read-only!) */ 429 430 /* extended error reporting stuff (eer) */ 431 struct dasd_ccw_req *eer_cqr; 432 433 /* Device discipline stuff. */ 434 struct dasd_discipline *discipline; 435 struct dasd_discipline *base_discipline; 436 char *private; 437 struct dasd_path path_data; 438 439 /* Device state and target state. */ 440 int state, target; 441 struct mutex state_mutex; 442 int stopped; /* device (ccw_device_start) was stopped */ 443 444 /* reference count. */ 445 atomic_t ref_count; 446 447 /* ccw queue and memory for static ccw/erp buffers. */ 448 struct list_head ccw_queue; 449 spinlock_t mem_lock; 450 void *ccw_mem; 451 void *erp_mem; 452 struct list_head ccw_chunks; 453 struct list_head erp_chunks; 454 455 atomic_t tasklet_scheduled; 456 struct tasklet_struct tasklet; 457 struct work_struct kick_work; 458 struct work_struct restore_device; 459 struct work_struct reload_device; 460 struct work_struct kick_validate; 461 struct timer_list timer; 462 463 debug_info_t *debug_area; 464 465 struct ccw_device *cdev; 466 467 /* hook for alias management */ 468 struct list_head alias_list; 469 470 /* default expiration time in s */ 471 unsigned long default_expires; 472 unsigned long default_retries; 473 474 unsigned long blk_timeout; 475 476 struct dentry *debugfs_dentry; 477 struct dasd_profile profile; 478 }; 479 480 struct dasd_block { 481 /* Block device stuff. */ 482 struct gendisk *gdp; 483 struct request_queue *request_queue; 484 spinlock_t request_queue_lock; 485 struct block_device *bdev; 486 atomic_t open_count; 487 488 unsigned long long blocks; /* size of volume in blocks */ 489 unsigned int bp_block; /* bytes per block */ 490 unsigned int s2b_shift; /* log2 (bp_block/512) */ 491 492 struct dasd_device *base; 493 struct list_head ccw_queue; 494 spinlock_t queue_lock; 495 496 atomic_t tasklet_scheduled; 497 struct tasklet_struct tasklet; 498 struct timer_list timer; 499 500 struct dentry *debugfs_dentry; 501 struct dasd_profile profile; 502 }; 503 504 505 506 /* reasons why device (ccw_device_start) was stopped */ 507 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 508 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 509 #define DASD_STOPPED_PENDING 4 /* long busy */ 510 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 511 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 512 #define DASD_STOPPED_PM 32 /* pm state transition */ 513 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 514 515 /* per device flags */ 516 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 517 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 518 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 519 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 520 * confuse this with the user specified 521 * read-only feature. 522 */ 523 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 524 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 525 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 526 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ 527 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ 528 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ 529 530 #define DASD_SLEEPON_START_TAG ((void *) 1) 531 #define DASD_SLEEPON_END_TAG ((void *) 2) 532 533 void dasd_put_device_wake(struct dasd_device *); 534 535 /* 536 * Reference count inliners 537 */ 538 static inline void 539 dasd_get_device(struct dasd_device *device) 540 { 541 atomic_inc(&device->ref_count); 542 } 543 544 static inline void 545 dasd_put_device(struct dasd_device *device) 546 { 547 if (atomic_dec_return(&device->ref_count) == 0) 548 dasd_put_device_wake(device); 549 } 550 551 /* 552 * The static memory in ccw_mem and erp_mem is managed by a sorted 553 * list of free memory chunks. 554 */ 555 struct dasd_mchunk 556 { 557 struct list_head list; 558 unsigned long size; 559 } __attribute__ ((aligned(8))); 560 561 static inline void 562 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 563 unsigned long size) 564 { 565 struct dasd_mchunk *chunk; 566 567 INIT_LIST_HEAD(chunk_list); 568 chunk = (struct dasd_mchunk *) mem; 569 chunk->size = size - sizeof(struct dasd_mchunk); 570 list_add(&chunk->list, chunk_list); 571 } 572 573 static inline void * 574 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 575 { 576 struct dasd_mchunk *chunk, *tmp; 577 578 size = (size + 7L) & -8L; 579 list_for_each_entry(chunk, chunk_list, list) { 580 if (chunk->size < size) 581 continue; 582 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 583 char *endaddr = (char *) (chunk + 1) + chunk->size; 584 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 585 tmp->size = size; 586 chunk->size -= size + sizeof(struct dasd_mchunk); 587 chunk = tmp; 588 } else 589 list_del(&chunk->list); 590 return (void *) (chunk + 1); 591 } 592 return NULL; 593 } 594 595 static inline void 596 dasd_free_chunk(struct list_head *chunk_list, void *mem) 597 { 598 struct dasd_mchunk *chunk, *tmp; 599 struct list_head *p, *left; 600 601 chunk = (struct dasd_mchunk *) 602 ((char *) mem - sizeof(struct dasd_mchunk)); 603 /* Find out the left neighbour in chunk_list. */ 604 left = chunk_list; 605 list_for_each(p, chunk_list) { 606 if (list_entry(p, struct dasd_mchunk, list) > chunk) 607 break; 608 left = p; 609 } 610 /* Try to merge with right neighbour = next element from left. */ 611 if (left->next != chunk_list) { 612 tmp = list_entry(left->next, struct dasd_mchunk, list); 613 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 614 list_del(&tmp->list); 615 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 616 } 617 } 618 /* Try to merge with left neighbour. */ 619 if (left != chunk_list) { 620 tmp = list_entry(left, struct dasd_mchunk, list); 621 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 622 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 623 return; 624 } 625 } 626 __list_add(&chunk->list, left, left->next); 627 } 628 629 /* 630 * Check if bsize is in { 512, 1024, 2048, 4096 } 631 */ 632 static inline int 633 dasd_check_blocksize(int bsize) 634 { 635 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 636 return -EMEDIUMTYPE; 637 return 0; 638 } 639 640 /* externals in dasd.c */ 641 #define DASD_PROFILE_OFF 0 642 #define DASD_PROFILE_ON 1 643 #define DASD_PROFILE_GLOBAL_ONLY 2 644 645 extern debug_info_t *dasd_debug_area; 646 extern struct dasd_profile_info dasd_global_profile_data; 647 extern unsigned int dasd_global_profile_level; 648 extern const struct block_device_operations dasd_device_operations; 649 650 extern struct kmem_cache *dasd_page_cache; 651 652 struct dasd_ccw_req * 653 dasd_kmalloc_request(int , int, int, struct dasd_device *); 654 struct dasd_ccw_req * 655 dasd_smalloc_request(int , int, int, struct dasd_device *); 656 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 657 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 658 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 659 660 static inline int 661 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 662 { 663 return set_normalized_cda(ccw, cda); 664 } 665 666 struct dasd_device *dasd_alloc_device(void); 667 void dasd_free_device(struct dasd_device *); 668 669 struct dasd_block *dasd_alloc_block(void); 670 void dasd_free_block(struct dasd_block *); 671 672 enum blk_eh_timer_return dasd_times_out(struct request *req); 673 674 void dasd_enable_device(struct dasd_device *); 675 void dasd_set_target_state(struct dasd_device *, int); 676 void dasd_kick_device(struct dasd_device *); 677 void dasd_restore_device(struct dasd_device *); 678 void dasd_reload_device(struct dasd_device *); 679 680 void dasd_add_request_head(struct dasd_ccw_req *); 681 void dasd_add_request_tail(struct dasd_ccw_req *); 682 int dasd_start_IO(struct dasd_ccw_req *); 683 int dasd_term_IO(struct dasd_ccw_req *); 684 void dasd_schedule_device_bh(struct dasd_device *); 685 void dasd_schedule_block_bh(struct dasd_block *); 686 int dasd_sleep_on(struct dasd_ccw_req *); 687 int dasd_sleep_on_queue(struct list_head *); 688 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 689 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 690 void dasd_device_set_timer(struct dasd_device *, int); 691 void dasd_device_clear_timer(struct dasd_device *); 692 void dasd_block_set_timer(struct dasd_block *, int); 693 void dasd_block_clear_timer(struct dasd_block *); 694 int dasd_cancel_req(struct dasd_ccw_req *); 695 int dasd_flush_device_queue(struct dasd_device *); 696 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 697 void dasd_generic_remove (struct ccw_device *cdev); 698 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 699 int dasd_generic_set_offline (struct ccw_device *cdev); 700 int dasd_generic_notify(struct ccw_device *, int); 701 int dasd_generic_last_path_gone(struct dasd_device *); 702 int dasd_generic_path_operational(struct dasd_device *); 703 void dasd_generic_shutdown(struct ccw_device *); 704 705 void dasd_generic_handle_state_change(struct dasd_device *); 706 int dasd_generic_pm_freeze(struct ccw_device *); 707 int dasd_generic_restore_device(struct ccw_device *); 708 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 709 void dasd_generic_path_event(struct ccw_device *, int *); 710 int dasd_generic_verify_path(struct dasd_device *, __u8); 711 712 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 713 char *dasd_get_sense(struct irb *); 714 715 void dasd_device_set_stop_bits(struct dasd_device *, int); 716 void dasd_device_remove_stop_bits(struct dasd_device *, int); 717 718 int dasd_device_is_ro(struct dasd_device *); 719 720 void dasd_profile_reset(struct dasd_profile *); 721 int dasd_profile_on(struct dasd_profile *); 722 void dasd_profile_off(struct dasd_profile *); 723 void dasd_global_profile_reset(void); 724 char *dasd_get_user_string(const char __user *, size_t); 725 726 /* externals in dasd_devmap.c */ 727 extern int dasd_max_devindex; 728 extern int dasd_probeonly; 729 extern int dasd_autodetect; 730 extern int dasd_nopav; 731 extern int dasd_nofcx; 732 733 int dasd_devmap_init(void); 734 void dasd_devmap_exit(void); 735 736 struct dasd_device *dasd_create_device(struct ccw_device *); 737 void dasd_delete_device(struct dasd_device *); 738 739 int dasd_get_feature(struct ccw_device *, int); 740 int dasd_set_feature(struct ccw_device *, int, int); 741 742 int dasd_add_sysfs_files(struct ccw_device *); 743 void dasd_remove_sysfs_files(struct ccw_device *); 744 745 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 746 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 747 struct dasd_device *dasd_device_from_devindex(int); 748 749 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 750 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 751 752 int dasd_parse(void); 753 int dasd_busid_known(const char *); 754 755 /* externals in dasd_gendisk.c */ 756 int dasd_gendisk_init(void); 757 void dasd_gendisk_exit(void); 758 int dasd_gendisk_alloc(struct dasd_block *); 759 void dasd_gendisk_free(struct dasd_block *); 760 int dasd_scan_partitions(struct dasd_block *); 761 void dasd_destroy_partitions(struct dasd_block *); 762 763 /* externals in dasd_ioctl.c */ 764 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 765 766 /* externals in dasd_proc.c */ 767 int dasd_proc_init(void); 768 void dasd_proc_exit(void); 769 770 /* externals in dasd_erp.c */ 771 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 772 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 773 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 774 struct dasd_device *); 775 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 776 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 777 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 778 779 /* externals in dasd_3990_erp.c */ 780 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 781 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 782 783 /* externals in dasd_eer.c */ 784 #ifdef CONFIG_DASD_EER 785 int dasd_eer_init(void); 786 void dasd_eer_exit(void); 787 int dasd_eer_enable(struct dasd_device *); 788 void dasd_eer_disable(struct dasd_device *); 789 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 790 unsigned int id); 791 void dasd_eer_snss(struct dasd_device *); 792 793 static inline int dasd_eer_enabled(struct dasd_device *device) 794 { 795 return device->eer_cqr != NULL; 796 } 797 #else 798 #define dasd_eer_init() (0) 799 #define dasd_eer_exit() do { } while (0) 800 #define dasd_eer_enable(d) (0) 801 #define dasd_eer_disable(d) do { } while (0) 802 #define dasd_eer_write(d,c,i) do { } while (0) 803 #define dasd_eer_snss(d) do { } while (0) 804 #define dasd_eer_enabled(d) (0) 805 #endif /* CONFIG_DASD_ERR */ 806 807 #endif /* DASD_H */ 808