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 * A single CQR can only contain a maximum of 255 CCWs. It is limited by 245 * the locate record and locate record extended count value which can only hold 246 * 1 Byte max. 247 */ 248 #define DASD_CQR_MAX_CCW 255 249 250 /* 251 * Unique identifier for dasd device. 252 */ 253 #define UA_NOT_CONFIGURED 0x00 254 #define UA_BASE_DEVICE 0x01 255 #define UA_BASE_PAV_ALIAS 0x02 256 #define UA_HYPER_PAV_ALIAS 0x03 257 258 struct dasd_uid { 259 __u8 type; 260 char vendor[4]; 261 char serial[15]; 262 __u16 ssid; 263 __u8 real_unit_addr; 264 __u8 base_unit_addr; 265 char vduit[33]; 266 }; 267 268 /* 269 * the struct dasd_discipline is 270 * sth like a table of virtual functions, if you think of dasd_eckd 271 * inheriting dasd... 272 * no, currently we are not planning to reimplement the driver in C++ 273 */ 274 struct dasd_discipline { 275 struct module *owner; 276 char ebcname[8]; /* a name used for tagging and printks */ 277 char name[8]; /* a name used for tagging and printks */ 278 int max_blocks; /* maximum number of blocks to be chained */ 279 280 struct list_head list; /* used for list of disciplines */ 281 282 /* 283 * Device recognition functions. check_device is used to verify 284 * the sense data and the information returned by read device 285 * characteristics. It returns 0 if the discipline can be used 286 * for the device in question. uncheck_device is called during 287 * device shutdown to deregister a device from its discipline. 288 */ 289 int (*check_device) (struct dasd_device *); 290 void (*uncheck_device) (struct dasd_device *); 291 292 /* 293 * do_analysis is used in the step from device state "basic" to 294 * state "accept". It returns 0 if the device can be made ready, 295 * it returns -EMEDIUMTYPE if the device can't be made ready or 296 * -EAGAIN if do_analysis started a ccw that needs to complete 297 * before the analysis may be repeated. 298 */ 299 int (*do_analysis) (struct dasd_block *); 300 301 /* 302 * This function is called, when new paths become available. 303 * Disciplins may use this callback to do necessary setup work, 304 * e.g. verify that new path is compatible with the current 305 * configuration. 306 */ 307 int (*verify_path)(struct dasd_device *, __u8); 308 309 /* 310 * Last things to do when a device is set online, and first things 311 * when it is set offline. 312 */ 313 int (*basic_to_ready) (struct dasd_device *); 314 int (*online_to_ready) (struct dasd_device *); 315 int (*basic_to_known)(struct dasd_device *); 316 317 /* (struct dasd_device *); 318 * Device operation functions. build_cp creates a ccw chain for 319 * a block device request, start_io starts the request and 320 * term_IO cancels it (e.g. in case of a timeout). format_device 321 * returns a ccw chain to be used to format the device. 322 * handle_terminated_request allows to examine a cqr and prepare 323 * it for retry. 324 */ 325 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 326 struct dasd_block *, 327 struct request *); 328 int (*start_IO) (struct dasd_ccw_req *); 329 int (*term_IO) (struct dasd_ccw_req *); 330 void (*handle_terminated_request) (struct dasd_ccw_req *); 331 int (*format_device) (struct dasd_device *, 332 struct format_data_t *, int enable_pav); 333 int (*free_cp) (struct dasd_ccw_req *, struct request *); 334 335 /* 336 * Error recovery functions. examine_error() returns a value that 337 * indicates what to do for an error condition. If examine_error() 338 * returns 'dasd_era_recover' erp_action() is called to create a 339 * special error recovery ccw. erp_postaction() is called after 340 * an error recovery ccw has finished its execution. dump_sense 341 * is called for every error condition to print the sense data 342 * to the console. 343 */ 344 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 345 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 346 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 347 struct irb *); 348 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 349 void (*check_for_device_change) (struct dasd_device *, 350 struct dasd_ccw_req *, 351 struct irb *); 352 353 /* i/o control functions. */ 354 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 355 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 356 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 357 358 /* suspend/resume functions */ 359 int (*freeze) (struct dasd_device *); 360 int (*restore) (struct dasd_device *); 361 362 /* reload device after state change */ 363 int (*reload) (struct dasd_device *); 364 365 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 366 void (*kick_validate) (struct dasd_device *); 367 int (*check_attention)(struct dasd_device *, __u8); 368 }; 369 370 extern struct dasd_discipline *dasd_diag_discipline_pointer; 371 372 /* 373 * Notification numbers for extended error reporting notifications: 374 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 375 * eer pointer) is freed. The error reporting module needs to do all necessary 376 * cleanup steps. 377 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 378 */ 379 #define DASD_EER_DISABLE 0 380 #define DASD_EER_TRIGGER 1 381 382 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 383 #define DASD_EER_FATALERROR 1 384 #define DASD_EER_NOPATH 2 385 #define DASD_EER_STATECHANGE 3 386 #define DASD_EER_PPRCSUSPEND 4 387 388 struct dasd_path { 389 __u8 opm; 390 __u8 tbvpm; 391 __u8 ppm; 392 __u8 npm; 393 /* paths that are not used because of a special condition */ 394 __u8 cablepm; /* miss-cabled */ 395 __u8 hpfpm; /* the HPF requirements of the other paths are not met */ 396 __u8 cuirpm; /* CUIR varied offline */ 397 }; 398 399 struct dasd_profile_info { 400 /* legacy part of profile data, as in dasd_profile_info_t */ 401 unsigned int dasd_io_reqs; /* number of requests processed */ 402 unsigned int dasd_io_sects; /* number of sectors processed */ 403 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 404 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 405 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 406 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 407 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 408 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 409 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 410 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 411 412 /* new data */ 413 struct timespec starttod; /* time of start or last reset */ 414 unsigned int dasd_io_alias; /* requests using an alias */ 415 unsigned int dasd_io_tpm; /* requests using transport mode */ 416 unsigned int dasd_read_reqs; /* total number of read requests */ 417 unsigned int dasd_read_sects; /* total number read sectors */ 418 unsigned int dasd_read_alias; /* read request using an alias */ 419 unsigned int dasd_read_tpm; /* read requests in transport mode */ 420 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 421 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 422 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 423 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 424 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 425 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 426 }; 427 428 struct dasd_profile { 429 struct dentry *dentry; 430 struct dasd_profile_info *data; 431 spinlock_t lock; 432 }; 433 434 struct dasd_device { 435 /* Block device stuff. */ 436 struct dasd_block *block; 437 438 unsigned int devindex; 439 unsigned long flags; /* per device flags */ 440 unsigned short features; /* copy of devmap-features (read-only!) */ 441 442 /* extended error reporting stuff (eer) */ 443 struct dasd_ccw_req *eer_cqr; 444 445 /* Device discipline stuff. */ 446 struct dasd_discipline *discipline; 447 struct dasd_discipline *base_discipline; 448 void *private; 449 struct dasd_path path_data; 450 451 /* Device state and target state. */ 452 int state, target; 453 struct mutex state_mutex; 454 int stopped; /* device (ccw_device_start) was stopped */ 455 456 /* reference count. */ 457 atomic_t ref_count; 458 459 /* ccw queue and memory for static ccw/erp buffers. */ 460 struct list_head ccw_queue; 461 spinlock_t mem_lock; 462 void *ccw_mem; 463 void *erp_mem; 464 struct list_head ccw_chunks; 465 struct list_head erp_chunks; 466 467 atomic_t tasklet_scheduled; 468 struct tasklet_struct tasklet; 469 struct work_struct kick_work; 470 struct work_struct restore_device; 471 struct work_struct reload_device; 472 struct work_struct kick_validate; 473 struct work_struct suc_work; 474 struct timer_list timer; 475 476 debug_info_t *debug_area; 477 478 struct ccw_device *cdev; 479 480 /* hook for alias management */ 481 struct list_head alias_list; 482 483 /* default expiration time in s */ 484 unsigned long default_expires; 485 unsigned long default_retries; 486 487 unsigned long blk_timeout; 488 489 struct dentry *debugfs_dentry; 490 struct dasd_profile profile; 491 }; 492 493 struct dasd_block { 494 /* Block device stuff. */ 495 struct gendisk *gdp; 496 struct request_queue *request_queue; 497 spinlock_t request_queue_lock; 498 struct block_device *bdev; 499 atomic_t open_count; 500 501 unsigned long long blocks; /* size of volume in blocks */ 502 unsigned int bp_block; /* bytes per block */ 503 unsigned int s2b_shift; /* log2 (bp_block/512) */ 504 505 struct dasd_device *base; 506 struct list_head ccw_queue; 507 spinlock_t queue_lock; 508 509 atomic_t tasklet_scheduled; 510 struct tasklet_struct tasklet; 511 struct timer_list timer; 512 513 struct dentry *debugfs_dentry; 514 struct dasd_profile profile; 515 }; 516 517 struct dasd_attention_data { 518 struct dasd_device *device; 519 __u8 lpum; 520 }; 521 522 /* reasons why device (ccw_device_start) was stopped */ 523 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 524 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 525 #define DASD_STOPPED_PENDING 4 /* long busy */ 526 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 527 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 528 #define DASD_STOPPED_PM 32 /* pm state transition */ 529 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 530 531 /* per device flags */ 532 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 533 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 534 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 535 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 536 * confuse this with the user specified 537 * read-only feature. 538 */ 539 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 540 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 541 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 542 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ 543 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ 544 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ 545 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ 546 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */ 547 548 #define DASD_SLEEPON_START_TAG ((void *) 1) 549 #define DASD_SLEEPON_END_TAG ((void *) 2) 550 551 void dasd_put_device_wake(struct dasd_device *); 552 553 /* 554 * Reference count inliners 555 */ 556 static inline void 557 dasd_get_device(struct dasd_device *device) 558 { 559 atomic_inc(&device->ref_count); 560 } 561 562 static inline void 563 dasd_put_device(struct dasd_device *device) 564 { 565 if (atomic_dec_return(&device->ref_count) == 0) 566 dasd_put_device_wake(device); 567 } 568 569 /* 570 * The static memory in ccw_mem and erp_mem is managed by a sorted 571 * list of free memory chunks. 572 */ 573 struct dasd_mchunk 574 { 575 struct list_head list; 576 unsigned long size; 577 } __attribute__ ((aligned(8))); 578 579 static inline void 580 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 581 unsigned long size) 582 { 583 struct dasd_mchunk *chunk; 584 585 INIT_LIST_HEAD(chunk_list); 586 chunk = (struct dasd_mchunk *) mem; 587 chunk->size = size - sizeof(struct dasd_mchunk); 588 list_add(&chunk->list, chunk_list); 589 } 590 591 static inline void * 592 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 593 { 594 struct dasd_mchunk *chunk, *tmp; 595 596 size = (size + 7L) & -8L; 597 list_for_each_entry(chunk, chunk_list, list) { 598 if (chunk->size < size) 599 continue; 600 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 601 char *endaddr = (char *) (chunk + 1) + chunk->size; 602 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 603 tmp->size = size; 604 chunk->size -= size + sizeof(struct dasd_mchunk); 605 chunk = tmp; 606 } else 607 list_del(&chunk->list); 608 return (void *) (chunk + 1); 609 } 610 return NULL; 611 } 612 613 static inline void 614 dasd_free_chunk(struct list_head *chunk_list, void *mem) 615 { 616 struct dasd_mchunk *chunk, *tmp; 617 struct list_head *p, *left; 618 619 chunk = (struct dasd_mchunk *) 620 ((char *) mem - sizeof(struct dasd_mchunk)); 621 /* Find out the left neighbour in chunk_list. */ 622 left = chunk_list; 623 list_for_each(p, chunk_list) { 624 if (list_entry(p, struct dasd_mchunk, list) > chunk) 625 break; 626 left = p; 627 } 628 /* Try to merge with right neighbour = next element from left. */ 629 if (left->next != chunk_list) { 630 tmp = list_entry(left->next, struct dasd_mchunk, list); 631 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 632 list_del(&tmp->list); 633 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 634 } 635 } 636 /* Try to merge with left neighbour. */ 637 if (left != chunk_list) { 638 tmp = list_entry(left, struct dasd_mchunk, list); 639 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 640 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 641 return; 642 } 643 } 644 __list_add(&chunk->list, left, left->next); 645 } 646 647 /* 648 * Check if bsize is in { 512, 1024, 2048, 4096 } 649 */ 650 static inline int 651 dasd_check_blocksize(int bsize) 652 { 653 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 654 return -EMEDIUMTYPE; 655 return 0; 656 } 657 658 /* externals in dasd.c */ 659 #define DASD_PROFILE_OFF 0 660 #define DASD_PROFILE_ON 1 661 #define DASD_PROFILE_GLOBAL_ONLY 2 662 663 extern debug_info_t *dasd_debug_area; 664 extern struct dasd_profile dasd_global_profile; 665 extern unsigned int dasd_global_profile_level; 666 extern const struct block_device_operations dasd_device_operations; 667 668 extern struct kmem_cache *dasd_page_cache; 669 670 struct dasd_ccw_req * 671 dasd_kmalloc_request(int , int, int, struct dasd_device *); 672 struct dasd_ccw_req * 673 dasd_smalloc_request(int , int, int, struct dasd_device *); 674 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 675 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 676 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 677 678 static inline int 679 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 680 { 681 return set_normalized_cda(ccw, cda); 682 } 683 684 struct dasd_device *dasd_alloc_device(void); 685 void dasd_free_device(struct dasd_device *); 686 687 struct dasd_block *dasd_alloc_block(void); 688 void dasd_free_block(struct dasd_block *); 689 690 enum blk_eh_timer_return dasd_times_out(struct request *req); 691 692 void dasd_enable_device(struct dasd_device *); 693 void dasd_set_target_state(struct dasd_device *, int); 694 void dasd_kick_device(struct dasd_device *); 695 void dasd_restore_device(struct dasd_device *); 696 void dasd_reload_device(struct dasd_device *); 697 698 void dasd_add_request_head(struct dasd_ccw_req *); 699 void dasd_add_request_tail(struct dasd_ccw_req *); 700 int dasd_start_IO(struct dasd_ccw_req *); 701 int dasd_term_IO(struct dasd_ccw_req *); 702 void dasd_schedule_device_bh(struct dasd_device *); 703 void dasd_schedule_block_bh(struct dasd_block *); 704 int dasd_sleep_on(struct dasd_ccw_req *); 705 int dasd_sleep_on_queue(struct list_head *); 706 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 707 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 708 void dasd_device_set_timer(struct dasd_device *, int); 709 void dasd_device_clear_timer(struct dasd_device *); 710 void dasd_block_set_timer(struct dasd_block *, int); 711 void dasd_block_clear_timer(struct dasd_block *); 712 int dasd_cancel_req(struct dasd_ccw_req *); 713 int dasd_flush_device_queue(struct dasd_device *); 714 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 715 void dasd_generic_remove (struct ccw_device *cdev); 716 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 717 int dasd_generic_set_offline (struct ccw_device *cdev); 718 int dasd_generic_notify(struct ccw_device *, int); 719 int dasd_generic_last_path_gone(struct dasd_device *); 720 int dasd_generic_path_operational(struct dasd_device *); 721 void dasd_generic_shutdown(struct ccw_device *); 722 723 void dasd_generic_handle_state_change(struct dasd_device *); 724 int dasd_generic_pm_freeze(struct ccw_device *); 725 int dasd_generic_restore_device(struct ccw_device *); 726 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 727 void dasd_generic_path_event(struct ccw_device *, int *); 728 int dasd_generic_verify_path(struct dasd_device *, __u8); 729 730 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 731 char *dasd_get_sense(struct irb *); 732 733 void dasd_device_set_stop_bits(struct dasd_device *, int); 734 void dasd_device_remove_stop_bits(struct dasd_device *, int); 735 736 int dasd_device_is_ro(struct dasd_device *); 737 738 void dasd_profile_reset(struct dasd_profile *); 739 int dasd_profile_on(struct dasd_profile *); 740 void dasd_profile_off(struct dasd_profile *); 741 char *dasd_get_user_string(const char __user *, size_t); 742 743 /* externals in dasd_devmap.c */ 744 extern int dasd_max_devindex; 745 extern int dasd_probeonly; 746 extern int dasd_autodetect; 747 extern int dasd_nopav; 748 extern int dasd_nofcx; 749 750 int dasd_devmap_init(void); 751 void dasd_devmap_exit(void); 752 753 struct dasd_device *dasd_create_device(struct ccw_device *); 754 void dasd_delete_device(struct dasd_device *); 755 756 int dasd_get_feature(struct ccw_device *, int); 757 int dasd_set_feature(struct ccw_device *, int, int); 758 759 int dasd_add_sysfs_files(struct ccw_device *); 760 void dasd_remove_sysfs_files(struct ccw_device *); 761 762 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 763 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 764 struct dasd_device *dasd_device_from_devindex(int); 765 766 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 767 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 768 769 int dasd_parse(void); 770 int dasd_busid_known(const char *); 771 772 /* externals in dasd_gendisk.c */ 773 int dasd_gendisk_init(void); 774 void dasd_gendisk_exit(void); 775 int dasd_gendisk_alloc(struct dasd_block *); 776 void dasd_gendisk_free(struct dasd_block *); 777 int dasd_scan_partitions(struct dasd_block *); 778 void dasd_destroy_partitions(struct dasd_block *); 779 780 /* externals in dasd_ioctl.c */ 781 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 782 783 /* externals in dasd_proc.c */ 784 int dasd_proc_init(void); 785 void dasd_proc_exit(void); 786 787 /* externals in dasd_erp.c */ 788 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 789 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 790 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 791 struct dasd_device *); 792 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 793 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 794 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 795 796 /* externals in dasd_3990_erp.c */ 797 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 798 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 799 800 /* externals in dasd_eer.c */ 801 #ifdef CONFIG_DASD_EER 802 int dasd_eer_init(void); 803 void dasd_eer_exit(void); 804 int dasd_eer_enable(struct dasd_device *); 805 void dasd_eer_disable(struct dasd_device *); 806 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 807 unsigned int id); 808 void dasd_eer_snss(struct dasd_device *); 809 810 static inline int dasd_eer_enabled(struct dasd_device *device) 811 { 812 return device->eer_cqr != NULL; 813 } 814 #else 815 #define dasd_eer_init() (0) 816 #define dasd_eer_exit() do { } while (0) 817 #define dasd_eer_enable(d) (0) 818 #define dasd_eer_disable(d) do { } while (0) 819 #define dasd_eer_write(d,c,i) do { } while (0) 820 #define dasd_eer_snss(d) do { } while (0) 821 #define dasd_eer_enabled(d) (0) 822 #endif /* CONFIG_DASD_ERR */ 823 824 #endif /* DASD_H */ 825