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 void *cpaddr; /* address of ccw or tcw */ 179 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ 180 char status; /* status of this request */ 181 short retries; /* A retry counter */ 182 unsigned long flags; /* flags of this request */ 183 184 /* ... and how */ 185 unsigned long starttime; /* jiffies time of request start */ 186 unsigned long expires; /* expiration period in jiffies */ 187 char lpm; /* logical path mask */ 188 void *data; /* pointer to data area */ 189 190 /* these are important for recovering erroneous requests */ 191 int intrc; /* internal error, e.g. from start_IO */ 192 struct irb irb; /* device status in case of an error */ 193 struct dasd_ccw_req *refers; /* ERP-chain queueing. */ 194 void *function; /* originating ERP action */ 195 196 /* these are for statistics only */ 197 unsigned long long buildclk; /* TOD-clock of request generation */ 198 unsigned long long startclk; /* TOD-clock of request start */ 199 unsigned long long stopclk; /* TOD-clock of request interrupt */ 200 unsigned long long endclk; /* TOD-clock of request termination */ 201 202 /* Callback that is called after reaching final status. */ 203 void (*callback)(struct dasd_ccw_req *, void *data); 204 void *callback_data; 205 }; 206 207 /* 208 * dasd_ccw_req -> status can be: 209 */ 210 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ 211 #define DASD_CQR_DONE 0x01 /* request is completed successfully */ 212 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */ 213 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */ 214 #define DASD_CQR_FAILED 0x04 /* request is finally failed */ 215 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */ 216 217 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */ 218 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */ 219 #define DASD_CQR_ERROR 0x82 /* request is completed with error */ 220 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */ 221 #define DASD_CQR_CLEARED 0x84 /* request was cleared */ 222 #define DASD_CQR_SUCCESS 0x85 /* request was successful */ 223 224 /* default expiration time*/ 225 #define DASD_EXPIRES 300 226 #define DASD_EXPIRES_MAX 40000000 227 #define DASD_RETRIES 256 228 #define DASD_RETRIES_MAX 32768 229 230 /* per dasd_ccw_req flags */ 231 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ 232 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ 233 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */ 234 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was 235 * stolen. Should not be combined with 236 * DASD_CQR_FLAGS_USE_ERP 237 */ 238 239 /* Signature for error recovery functions. */ 240 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 241 242 /* 243 * Unique identifier for dasd device. 244 */ 245 #define UA_NOT_CONFIGURED 0x00 246 #define UA_BASE_DEVICE 0x01 247 #define UA_BASE_PAV_ALIAS 0x02 248 #define UA_HYPER_PAV_ALIAS 0x03 249 250 struct dasd_uid { 251 __u8 type; 252 char vendor[4]; 253 char serial[15]; 254 __u16 ssid; 255 __u8 real_unit_addr; 256 __u8 base_unit_addr; 257 char vduit[33]; 258 }; 259 260 /* 261 * the struct dasd_discipline is 262 * sth like a table of virtual functions, if you think of dasd_eckd 263 * inheriting dasd... 264 * no, currently we are not planning to reimplement the driver in C++ 265 */ 266 struct dasd_discipline { 267 struct module *owner; 268 char ebcname[8]; /* a name used for tagging and printks */ 269 char name[8]; /* a name used for tagging and printks */ 270 int max_blocks; /* maximum number of blocks to be chained */ 271 272 struct list_head list; /* used for list of disciplines */ 273 274 /* 275 * Device recognition functions. check_device is used to verify 276 * the sense data and the information returned by read device 277 * characteristics. It returns 0 if the discipline can be used 278 * for the device in question. uncheck_device is called during 279 * device shutdown to deregister a device from its discipline. 280 */ 281 int (*check_device) (struct dasd_device *); 282 void (*uncheck_device) (struct dasd_device *); 283 284 /* 285 * do_analysis is used in the step from device state "basic" to 286 * state "accept". It returns 0 if the device can be made ready, 287 * it returns -EMEDIUMTYPE if the device can't be made ready or 288 * -EAGAIN if do_analysis started a ccw that needs to complete 289 * before the analysis may be repeated. 290 */ 291 int (*do_analysis) (struct dasd_block *); 292 293 /* 294 * This function is called, when new paths become available. 295 * Disciplins may use this callback to do necessary setup work, 296 * e.g. verify that new path is compatible with the current 297 * configuration. 298 */ 299 int (*verify_path)(struct dasd_device *, __u8); 300 301 /* 302 * Last things to do when a device is set online, and first things 303 * when it is set offline. 304 */ 305 int (*basic_to_ready) (struct dasd_device *); 306 int (*online_to_ready) (struct dasd_device *); 307 int (*ready_to_basic) (struct dasd_device *); 308 309 /* (struct dasd_device *); 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 int (*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 unsigned long default_retries; 472 473 unsigned long blk_timeout; 474 475 struct dentry *debugfs_dentry; 476 struct dasd_profile profile; 477 }; 478 479 struct dasd_block { 480 /* Block device stuff. */ 481 struct gendisk *gdp; 482 struct request_queue *request_queue; 483 spinlock_t request_queue_lock; 484 struct block_device *bdev; 485 atomic_t open_count; 486 487 unsigned long long blocks; /* size of volume in blocks */ 488 unsigned int bp_block; /* bytes per block */ 489 unsigned int s2b_shift; /* log2 (bp_block/512) */ 490 491 struct dasd_device *base; 492 struct list_head ccw_queue; 493 spinlock_t queue_lock; 494 495 atomic_t tasklet_scheduled; 496 struct tasklet_struct tasklet; 497 struct timer_list timer; 498 499 struct dentry *debugfs_dentry; 500 struct dasd_profile profile; 501 }; 502 503 504 505 /* reasons why device (ccw_device_start) was stopped */ 506 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 507 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 508 #define DASD_STOPPED_PENDING 4 /* long busy */ 509 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 510 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 511 #define DASD_STOPPED_PM 32 /* pm state transition */ 512 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 513 514 /* per device flags */ 515 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 516 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 517 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 518 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 519 * confuse this with the user specified 520 * read-only feature. 521 */ 522 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 523 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 524 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 525 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ 526 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ 527 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ 528 529 #define DASD_SLEEPON_START_TAG ((void *) 1) 530 #define DASD_SLEEPON_END_TAG ((void *) 2) 531 532 void dasd_put_device_wake(struct dasd_device *); 533 534 /* 535 * Reference count inliners 536 */ 537 static inline void 538 dasd_get_device(struct dasd_device *device) 539 { 540 atomic_inc(&device->ref_count); 541 } 542 543 static inline void 544 dasd_put_device(struct dasd_device *device) 545 { 546 if (atomic_dec_return(&device->ref_count) == 0) 547 dasd_put_device_wake(device); 548 } 549 550 /* 551 * The static memory in ccw_mem and erp_mem is managed by a sorted 552 * list of free memory chunks. 553 */ 554 struct dasd_mchunk 555 { 556 struct list_head list; 557 unsigned long size; 558 } __attribute__ ((aligned(8))); 559 560 static inline void 561 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 562 unsigned long size) 563 { 564 struct dasd_mchunk *chunk; 565 566 INIT_LIST_HEAD(chunk_list); 567 chunk = (struct dasd_mchunk *) mem; 568 chunk->size = size - sizeof(struct dasd_mchunk); 569 list_add(&chunk->list, chunk_list); 570 } 571 572 static inline void * 573 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 574 { 575 struct dasd_mchunk *chunk, *tmp; 576 577 size = (size + 7L) & -8L; 578 list_for_each_entry(chunk, chunk_list, list) { 579 if (chunk->size < size) 580 continue; 581 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 582 char *endaddr = (char *) (chunk + 1) + chunk->size; 583 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 584 tmp->size = size; 585 chunk->size -= size + sizeof(struct dasd_mchunk); 586 chunk = tmp; 587 } else 588 list_del(&chunk->list); 589 return (void *) (chunk + 1); 590 } 591 return NULL; 592 } 593 594 static inline void 595 dasd_free_chunk(struct list_head *chunk_list, void *mem) 596 { 597 struct dasd_mchunk *chunk, *tmp; 598 struct list_head *p, *left; 599 600 chunk = (struct dasd_mchunk *) 601 ((char *) mem - sizeof(struct dasd_mchunk)); 602 /* Find out the left neighbour in chunk_list. */ 603 left = chunk_list; 604 list_for_each(p, chunk_list) { 605 if (list_entry(p, struct dasd_mchunk, list) > chunk) 606 break; 607 left = p; 608 } 609 /* Try to merge with right neighbour = next element from left. */ 610 if (left->next != chunk_list) { 611 tmp = list_entry(left->next, struct dasd_mchunk, list); 612 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 613 list_del(&tmp->list); 614 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 615 } 616 } 617 /* Try to merge with left neighbour. */ 618 if (left != chunk_list) { 619 tmp = list_entry(left, struct dasd_mchunk, list); 620 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 621 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 622 return; 623 } 624 } 625 __list_add(&chunk->list, left, left->next); 626 } 627 628 /* 629 * Check if bsize is in { 512, 1024, 2048, 4096 } 630 */ 631 static inline int 632 dasd_check_blocksize(int bsize) 633 { 634 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 635 return -EMEDIUMTYPE; 636 return 0; 637 } 638 639 /* externals in dasd.c */ 640 #define DASD_PROFILE_OFF 0 641 #define DASD_PROFILE_ON 1 642 #define DASD_PROFILE_GLOBAL_ONLY 2 643 644 extern debug_info_t *dasd_debug_area; 645 extern struct dasd_profile_info dasd_global_profile_data; 646 extern unsigned int dasd_global_profile_level; 647 extern const struct block_device_operations dasd_device_operations; 648 649 extern struct kmem_cache *dasd_page_cache; 650 651 struct dasd_ccw_req * 652 dasd_kmalloc_request(int , int, int, struct dasd_device *); 653 struct dasd_ccw_req * 654 dasd_smalloc_request(int , int, int, struct dasd_device *); 655 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 656 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 657 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 658 659 static inline int 660 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 661 { 662 return set_normalized_cda(ccw, cda); 663 } 664 665 struct dasd_device *dasd_alloc_device(void); 666 void dasd_free_device(struct dasd_device *); 667 668 struct dasd_block *dasd_alloc_block(void); 669 void dasd_free_block(struct dasd_block *); 670 671 enum blk_eh_timer_return dasd_times_out(struct request *req); 672 673 void dasd_enable_device(struct dasd_device *); 674 void dasd_set_target_state(struct dasd_device *, int); 675 void dasd_kick_device(struct dasd_device *); 676 void dasd_restore_device(struct dasd_device *); 677 void dasd_reload_device(struct dasd_device *); 678 679 void dasd_add_request_head(struct dasd_ccw_req *); 680 void dasd_add_request_tail(struct dasd_ccw_req *); 681 int dasd_start_IO(struct dasd_ccw_req *); 682 int dasd_term_IO(struct dasd_ccw_req *); 683 void dasd_schedule_device_bh(struct dasd_device *); 684 void dasd_schedule_block_bh(struct dasd_block *); 685 int dasd_sleep_on(struct dasd_ccw_req *); 686 int dasd_sleep_on_queue(struct list_head *); 687 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 688 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 689 void dasd_device_set_timer(struct dasd_device *, int); 690 void dasd_device_clear_timer(struct dasd_device *); 691 void dasd_block_set_timer(struct dasd_block *, int); 692 void dasd_block_clear_timer(struct dasd_block *); 693 int dasd_cancel_req(struct dasd_ccw_req *); 694 int dasd_flush_device_queue(struct dasd_device *); 695 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 696 void dasd_generic_remove (struct ccw_device *cdev); 697 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 698 int dasd_generic_set_offline (struct ccw_device *cdev); 699 int dasd_generic_notify(struct ccw_device *, int); 700 int dasd_generic_last_path_gone(struct dasd_device *); 701 int dasd_generic_path_operational(struct dasd_device *); 702 void dasd_generic_shutdown(struct ccw_device *); 703 704 void dasd_generic_handle_state_change(struct dasd_device *); 705 int dasd_generic_pm_freeze(struct ccw_device *); 706 int dasd_generic_restore_device(struct ccw_device *); 707 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 708 void dasd_generic_path_event(struct ccw_device *, int *); 709 int dasd_generic_verify_path(struct dasd_device *, __u8); 710 711 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 712 char *dasd_get_sense(struct irb *); 713 714 void dasd_device_set_stop_bits(struct dasd_device *, int); 715 void dasd_device_remove_stop_bits(struct dasd_device *, int); 716 717 int dasd_device_is_ro(struct dasd_device *); 718 719 void dasd_profile_reset(struct dasd_profile *); 720 int dasd_profile_on(struct dasd_profile *); 721 void dasd_profile_off(struct dasd_profile *); 722 void dasd_global_profile_reset(void); 723 char *dasd_get_user_string(const char __user *, size_t); 724 725 /* externals in dasd_devmap.c */ 726 extern int dasd_max_devindex; 727 extern int dasd_probeonly; 728 extern int dasd_autodetect; 729 extern int dasd_nopav; 730 extern int dasd_nofcx; 731 732 int dasd_devmap_init(void); 733 void dasd_devmap_exit(void); 734 735 struct dasd_device *dasd_create_device(struct ccw_device *); 736 void dasd_delete_device(struct dasd_device *); 737 738 int dasd_get_feature(struct ccw_device *, int); 739 int dasd_set_feature(struct ccw_device *, int, int); 740 741 int dasd_add_sysfs_files(struct ccw_device *); 742 void dasd_remove_sysfs_files(struct ccw_device *); 743 744 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 745 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 746 struct dasd_device *dasd_device_from_devindex(int); 747 748 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 749 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 750 751 int dasd_parse(void); 752 int dasd_busid_known(const char *); 753 754 /* externals in dasd_gendisk.c */ 755 int dasd_gendisk_init(void); 756 void dasd_gendisk_exit(void); 757 int dasd_gendisk_alloc(struct dasd_block *); 758 void dasd_gendisk_free(struct dasd_block *); 759 int dasd_scan_partitions(struct dasd_block *); 760 void dasd_destroy_partitions(struct dasd_block *); 761 762 /* externals in dasd_ioctl.c */ 763 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 764 765 /* externals in dasd_proc.c */ 766 int dasd_proc_init(void); 767 void dasd_proc_exit(void); 768 769 /* externals in dasd_erp.c */ 770 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 771 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 772 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 773 struct dasd_device *); 774 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 775 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 776 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 777 778 /* externals in dasd_3990_erp.c */ 779 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 780 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 781 782 /* externals in dasd_eer.c */ 783 #ifdef CONFIG_DASD_EER 784 int dasd_eer_init(void); 785 void dasd_eer_exit(void); 786 int dasd_eer_enable(struct dasd_device *); 787 void dasd_eer_disable(struct dasd_device *); 788 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 789 unsigned int id); 790 void dasd_eer_snss(struct dasd_device *); 791 792 static inline int dasd_eer_enabled(struct dasd_device *device) 793 { 794 return device->eer_cqr != NULL; 795 } 796 #else 797 #define dasd_eer_init() (0) 798 #define dasd_eer_exit() do { } while (0) 799 #define dasd_eer_enable(d) (0) 800 #define dasd_eer_disable(d) do { } while (0) 801 #define dasd_eer_write(d,c,i) do { } while (0) 802 #define dasd_eer_snss(d) do { } while (0) 803 #define dasd_eer_enabled(d) (0) 804 #endif /* CONFIG_DASD_ERR */ 805 806 #endif /* DASD_H */ 807