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 int (*check_attention)(struct dasd_device *, __u8); 361 }; 362 363 extern struct dasd_discipline *dasd_diag_discipline_pointer; 364 365 /* 366 * Notification numbers for extended error reporting notifications: 367 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 368 * eer pointer) is freed. The error reporting module needs to do all necessary 369 * cleanup steps. 370 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 371 */ 372 #define DASD_EER_DISABLE 0 373 #define DASD_EER_TRIGGER 1 374 375 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 376 #define DASD_EER_FATALERROR 1 377 #define DASD_EER_NOPATH 2 378 #define DASD_EER_STATECHANGE 3 379 #define DASD_EER_PPRCSUSPEND 4 380 381 struct dasd_path { 382 __u8 opm; 383 __u8 tbvpm; 384 __u8 ppm; 385 __u8 npm; 386 /* paths that are not used because of a special condition */ 387 __u8 cablepm; /* miss-cabled */ 388 __u8 hpfpm; /* the HPF requirements of the other paths are not met */ 389 __u8 cuirpm; /* CUIR varied offline */ 390 }; 391 392 struct dasd_profile_info { 393 /* legacy part of profile data, as in dasd_profile_info_t */ 394 unsigned int dasd_io_reqs; /* number of requests processed */ 395 unsigned int dasd_io_sects; /* number of sectors processed */ 396 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 397 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 398 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 399 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 400 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 401 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 402 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 403 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 404 405 /* new data */ 406 struct timespec starttod; /* time of start or last reset */ 407 unsigned int dasd_io_alias; /* requests using an alias */ 408 unsigned int dasd_io_tpm; /* requests using transport mode */ 409 unsigned int dasd_read_reqs; /* total number of read requests */ 410 unsigned int dasd_read_sects; /* total number read sectors */ 411 unsigned int dasd_read_alias; /* read request using an alias */ 412 unsigned int dasd_read_tpm; /* read requests in transport mode */ 413 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 414 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 415 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 416 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 417 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 418 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 419 }; 420 421 struct dasd_profile { 422 struct dentry *dentry; 423 struct dasd_profile_info *data; 424 spinlock_t lock; 425 }; 426 427 struct dasd_device { 428 /* Block device stuff. */ 429 struct dasd_block *block; 430 431 unsigned int devindex; 432 unsigned long flags; /* per device flags */ 433 unsigned short features; /* copy of devmap-features (read-only!) */ 434 435 /* extended error reporting stuff (eer) */ 436 struct dasd_ccw_req *eer_cqr; 437 438 /* Device discipline stuff. */ 439 struct dasd_discipline *discipline; 440 struct dasd_discipline *base_discipline; 441 char *private; 442 struct dasd_path path_data; 443 444 /* Device state and target state. */ 445 int state, target; 446 struct mutex state_mutex; 447 int stopped; /* device (ccw_device_start) was stopped */ 448 449 /* reference count. */ 450 atomic_t ref_count; 451 452 /* ccw queue and memory for static ccw/erp buffers. */ 453 struct list_head ccw_queue; 454 spinlock_t mem_lock; 455 void *ccw_mem; 456 void *erp_mem; 457 struct list_head ccw_chunks; 458 struct list_head erp_chunks; 459 460 atomic_t tasklet_scheduled; 461 struct tasklet_struct tasklet; 462 struct work_struct kick_work; 463 struct work_struct restore_device; 464 struct work_struct reload_device; 465 struct work_struct kick_validate; 466 struct timer_list timer; 467 468 debug_info_t *debug_area; 469 470 struct ccw_device *cdev; 471 472 /* hook for alias management */ 473 struct list_head alias_list; 474 475 /* default expiration time in s */ 476 unsigned long default_expires; 477 unsigned long default_retries; 478 479 unsigned long blk_timeout; 480 481 struct dentry *debugfs_dentry; 482 struct dasd_profile profile; 483 }; 484 485 struct dasd_block { 486 /* Block device stuff. */ 487 struct gendisk *gdp; 488 struct request_queue *request_queue; 489 spinlock_t request_queue_lock; 490 struct block_device *bdev; 491 atomic_t open_count; 492 493 unsigned long long blocks; /* size of volume in blocks */ 494 unsigned int bp_block; /* bytes per block */ 495 unsigned int s2b_shift; /* log2 (bp_block/512) */ 496 497 struct dasd_device *base; 498 struct list_head ccw_queue; 499 spinlock_t queue_lock; 500 501 atomic_t tasklet_scheduled; 502 struct tasklet_struct tasklet; 503 struct timer_list timer; 504 505 struct dentry *debugfs_dentry; 506 struct dasd_profile profile; 507 }; 508 509 struct dasd_attention_data { 510 struct dasd_device *device; 511 __u8 lpum; 512 }; 513 514 /* reasons why device (ccw_device_start) was stopped */ 515 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 516 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 517 #define DASD_STOPPED_PENDING 4 /* long busy */ 518 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 519 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 520 #define DASD_STOPPED_PM 32 /* pm state transition */ 521 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 522 523 /* per device flags */ 524 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 525 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 526 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 527 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 528 * confuse this with the user specified 529 * read-only feature. 530 */ 531 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 532 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 533 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 534 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ 535 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ 536 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ 537 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ 538 539 #define DASD_SLEEPON_START_TAG ((void *) 1) 540 #define DASD_SLEEPON_END_TAG ((void *) 2) 541 542 void dasd_put_device_wake(struct dasd_device *); 543 544 /* 545 * Reference count inliners 546 */ 547 static inline void 548 dasd_get_device(struct dasd_device *device) 549 { 550 atomic_inc(&device->ref_count); 551 } 552 553 static inline void 554 dasd_put_device(struct dasd_device *device) 555 { 556 if (atomic_dec_return(&device->ref_count) == 0) 557 dasd_put_device_wake(device); 558 } 559 560 /* 561 * The static memory in ccw_mem and erp_mem is managed by a sorted 562 * list of free memory chunks. 563 */ 564 struct dasd_mchunk 565 { 566 struct list_head list; 567 unsigned long size; 568 } __attribute__ ((aligned(8))); 569 570 static inline void 571 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 572 unsigned long size) 573 { 574 struct dasd_mchunk *chunk; 575 576 INIT_LIST_HEAD(chunk_list); 577 chunk = (struct dasd_mchunk *) mem; 578 chunk->size = size - sizeof(struct dasd_mchunk); 579 list_add(&chunk->list, chunk_list); 580 } 581 582 static inline void * 583 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 584 { 585 struct dasd_mchunk *chunk, *tmp; 586 587 size = (size + 7L) & -8L; 588 list_for_each_entry(chunk, chunk_list, list) { 589 if (chunk->size < size) 590 continue; 591 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 592 char *endaddr = (char *) (chunk + 1) + chunk->size; 593 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 594 tmp->size = size; 595 chunk->size -= size + sizeof(struct dasd_mchunk); 596 chunk = tmp; 597 } else 598 list_del(&chunk->list); 599 return (void *) (chunk + 1); 600 } 601 return NULL; 602 } 603 604 static inline void 605 dasd_free_chunk(struct list_head *chunk_list, void *mem) 606 { 607 struct dasd_mchunk *chunk, *tmp; 608 struct list_head *p, *left; 609 610 chunk = (struct dasd_mchunk *) 611 ((char *) mem - sizeof(struct dasd_mchunk)); 612 /* Find out the left neighbour in chunk_list. */ 613 left = chunk_list; 614 list_for_each(p, chunk_list) { 615 if (list_entry(p, struct dasd_mchunk, list) > chunk) 616 break; 617 left = p; 618 } 619 /* Try to merge with right neighbour = next element from left. */ 620 if (left->next != chunk_list) { 621 tmp = list_entry(left->next, struct dasd_mchunk, list); 622 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 623 list_del(&tmp->list); 624 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 625 } 626 } 627 /* Try to merge with left neighbour. */ 628 if (left != chunk_list) { 629 tmp = list_entry(left, struct dasd_mchunk, list); 630 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 631 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 632 return; 633 } 634 } 635 __list_add(&chunk->list, left, left->next); 636 } 637 638 /* 639 * Check if bsize is in { 512, 1024, 2048, 4096 } 640 */ 641 static inline int 642 dasd_check_blocksize(int bsize) 643 { 644 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 645 return -EMEDIUMTYPE; 646 return 0; 647 } 648 649 /* externals in dasd.c */ 650 #define DASD_PROFILE_OFF 0 651 #define DASD_PROFILE_ON 1 652 #define DASD_PROFILE_GLOBAL_ONLY 2 653 654 extern debug_info_t *dasd_debug_area; 655 extern struct dasd_profile dasd_global_profile; 656 extern unsigned int dasd_global_profile_level; 657 extern const struct block_device_operations dasd_device_operations; 658 659 extern struct kmem_cache *dasd_page_cache; 660 661 struct dasd_ccw_req * 662 dasd_kmalloc_request(int , int, int, struct dasd_device *); 663 struct dasd_ccw_req * 664 dasd_smalloc_request(int , int, int, struct dasd_device *); 665 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 666 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 667 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 668 669 static inline int 670 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 671 { 672 return set_normalized_cda(ccw, cda); 673 } 674 675 struct dasd_device *dasd_alloc_device(void); 676 void dasd_free_device(struct dasd_device *); 677 678 struct dasd_block *dasd_alloc_block(void); 679 void dasd_free_block(struct dasd_block *); 680 681 enum blk_eh_timer_return dasd_times_out(struct request *req); 682 683 void dasd_enable_device(struct dasd_device *); 684 void dasd_set_target_state(struct dasd_device *, int); 685 void dasd_kick_device(struct dasd_device *); 686 void dasd_restore_device(struct dasd_device *); 687 void dasd_reload_device(struct dasd_device *); 688 689 void dasd_add_request_head(struct dasd_ccw_req *); 690 void dasd_add_request_tail(struct dasd_ccw_req *); 691 int dasd_start_IO(struct dasd_ccw_req *); 692 int dasd_term_IO(struct dasd_ccw_req *); 693 void dasd_schedule_device_bh(struct dasd_device *); 694 void dasd_schedule_block_bh(struct dasd_block *); 695 int dasd_sleep_on(struct dasd_ccw_req *); 696 int dasd_sleep_on_queue(struct list_head *); 697 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 698 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 699 void dasd_device_set_timer(struct dasd_device *, int); 700 void dasd_device_clear_timer(struct dasd_device *); 701 void dasd_block_set_timer(struct dasd_block *, int); 702 void dasd_block_clear_timer(struct dasd_block *); 703 int dasd_cancel_req(struct dasd_ccw_req *); 704 int dasd_flush_device_queue(struct dasd_device *); 705 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 706 void dasd_generic_remove (struct ccw_device *cdev); 707 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 708 int dasd_generic_set_offline (struct ccw_device *cdev); 709 int dasd_generic_notify(struct ccw_device *, int); 710 int dasd_generic_last_path_gone(struct dasd_device *); 711 int dasd_generic_path_operational(struct dasd_device *); 712 void dasd_generic_shutdown(struct ccw_device *); 713 714 void dasd_generic_handle_state_change(struct dasd_device *); 715 int dasd_generic_pm_freeze(struct ccw_device *); 716 int dasd_generic_restore_device(struct ccw_device *); 717 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 718 void dasd_generic_path_event(struct ccw_device *, int *); 719 int dasd_generic_verify_path(struct dasd_device *, __u8); 720 721 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 722 char *dasd_get_sense(struct irb *); 723 724 void dasd_device_set_stop_bits(struct dasd_device *, int); 725 void dasd_device_remove_stop_bits(struct dasd_device *, int); 726 727 int dasd_device_is_ro(struct dasd_device *); 728 729 void dasd_profile_reset(struct dasd_profile *); 730 int dasd_profile_on(struct dasd_profile *); 731 void dasd_profile_off(struct dasd_profile *); 732 char *dasd_get_user_string(const char __user *, size_t); 733 734 /* externals in dasd_devmap.c */ 735 extern int dasd_max_devindex; 736 extern int dasd_probeonly; 737 extern int dasd_autodetect; 738 extern int dasd_nopav; 739 extern int dasd_nofcx; 740 741 int dasd_devmap_init(void); 742 void dasd_devmap_exit(void); 743 744 struct dasd_device *dasd_create_device(struct ccw_device *); 745 void dasd_delete_device(struct dasd_device *); 746 747 int dasd_get_feature(struct ccw_device *, int); 748 int dasd_set_feature(struct ccw_device *, int, int); 749 750 int dasd_add_sysfs_files(struct ccw_device *); 751 void dasd_remove_sysfs_files(struct ccw_device *); 752 753 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 754 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 755 struct dasd_device *dasd_device_from_devindex(int); 756 757 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 758 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 759 760 int dasd_parse(void); 761 int dasd_busid_known(const char *); 762 763 /* externals in dasd_gendisk.c */ 764 int dasd_gendisk_init(void); 765 void dasd_gendisk_exit(void); 766 int dasd_gendisk_alloc(struct dasd_block *); 767 void dasd_gendisk_free(struct dasd_block *); 768 int dasd_scan_partitions(struct dasd_block *); 769 void dasd_destroy_partitions(struct dasd_block *); 770 771 /* externals in dasd_ioctl.c */ 772 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 773 774 /* externals in dasd_proc.c */ 775 int dasd_proc_init(void); 776 void dasd_proc_exit(void); 777 778 /* externals in dasd_erp.c */ 779 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 780 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 781 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 782 struct dasd_device *); 783 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 784 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 785 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 786 787 /* externals in dasd_3990_erp.c */ 788 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 789 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 790 791 /* externals in dasd_eer.c */ 792 #ifdef CONFIG_DASD_EER 793 int dasd_eer_init(void); 794 void dasd_eer_exit(void); 795 int dasd_eer_enable(struct dasd_device *); 796 void dasd_eer_disable(struct dasd_device *); 797 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 798 unsigned int id); 799 void dasd_eer_snss(struct dasd_device *); 800 801 static inline int dasd_eer_enabled(struct dasd_device *device) 802 { 803 return device->eer_cqr != NULL; 804 } 805 #else 806 #define dasd_eer_init() (0) 807 #define dasd_eer_exit() do { } while (0) 808 #define dasd_eer_enable(d) (0) 809 #define dasd_eer_disable(d) do { } while (0) 810 #define dasd_eer_write(d,c,i) do { } while (0) 811 #define dasd_eer_snss(d) do { } while (0) 812 #define dasd_eer_enabled(d) (0) 813 #endif /* CONFIG_DASD_ERR */ 814 815 #endif /* DASD_H */ 816