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 #include <linux/bitops.h> 59 60 /* DASD discipline magic */ 61 #define DASD_ECKD_MAGIC 0xC5C3D2C4 62 #define DASD_DIAG_MAGIC 0xC4C9C1C7 63 #define DASD_FBA_MAGIC 0xC6C2C140 64 65 /* 66 * SECTION: Type definitions 67 */ 68 struct dasd_device; 69 struct dasd_block; 70 71 /* BIT DEFINITIONS FOR SENSE DATA */ 72 #define DASD_SENSE_BIT_0 0x80 73 #define DASD_SENSE_BIT_1 0x40 74 #define DASD_SENSE_BIT_2 0x20 75 #define DASD_SENSE_BIT_3 0x10 76 77 /* BIT DEFINITIONS FOR SIM SENSE */ 78 #define DASD_SIM_SENSE 0x0F 79 #define DASD_SIM_MSG_TO_OP 0x03 80 #define DASD_SIM_LOG 0x0C 81 82 /* lock class for nested cdev lock */ 83 #define CDEV_NESTED_FIRST 1 84 #define CDEV_NESTED_SECOND 2 85 86 /* 87 * SECTION: MACROs for klogd and s390 debug feature (dbf) 88 */ 89 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ 90 do { \ 91 debug_sprintf_event(d_device->debug_area, \ 92 d_level, \ 93 d_str "\n", \ 94 d_data); \ 95 } while(0) 96 97 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \ 98 do { \ 99 debug_sprintf_exception(d_device->debug_area, \ 100 d_level, \ 101 d_str "\n", \ 102 d_data); \ 103 } while(0) 104 105 #define DBF_EVENT(d_level, d_str, d_data...)\ 106 do { \ 107 debug_sprintf_event(dasd_debug_area, \ 108 d_level,\ 109 d_str "\n", \ 110 d_data); \ 111 } while(0) 112 113 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \ 114 do { \ 115 struct ccw_dev_id __dev_id; \ 116 ccw_device_get_id(d_cdev, &__dev_id); \ 117 debug_sprintf_event(dasd_debug_area, \ 118 d_level, \ 119 "0.%x.%04x " d_str "\n", \ 120 __dev_id.ssid, __dev_id.devno, d_data); \ 121 } while (0) 122 123 #define DBF_EXC(d_level, d_str, d_data...)\ 124 do { \ 125 debug_sprintf_exception(dasd_debug_area, \ 126 d_level,\ 127 d_str "\n", \ 128 d_data); \ 129 } while(0) 130 131 /* limit size for an errorstring */ 132 #define ERRORLENGTH 30 133 134 /* definition of dbf debug levels */ 135 #define DBF_EMERG 0 /* system is unusable */ 136 #define DBF_ALERT 1 /* action must be taken immediately */ 137 #define DBF_CRIT 2 /* critical conditions */ 138 #define DBF_ERR 3 /* error conditions */ 139 #define DBF_WARNING 4 /* warning conditions */ 140 #define DBF_NOTICE 5 /* normal but significant condition */ 141 #define DBF_INFO 6 /* informational */ 142 #define DBF_DEBUG 6 /* debug-level messages */ 143 144 /* messages to be written via klogd and dbf */ 145 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ 146 do { \ 147 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 148 dev_name(&d_device->cdev->dev), d_args); \ 149 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ 150 } while(0) 151 152 #define MESSAGE(d_loglevel,d_string,d_args...)\ 153 do { \ 154 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 155 DBF_EVENT(DBF_ALERT, d_string, d_args); \ 156 } while(0) 157 158 /* messages to be written via klogd only */ 159 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\ 160 do { \ 161 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 162 dev_name(&d_device->cdev->dev), d_args); \ 163 } while(0) 164 165 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ 166 do { \ 167 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 168 } while(0) 169 170 struct dasd_ccw_req { 171 unsigned int magic; /* Eye catcher */ 172 struct list_head devlist; /* for dasd_device request queue */ 173 struct list_head blocklist; /* for dasd_block request queue */ 174 175 /* Where to execute what... */ 176 struct dasd_block *block; /* the originating block device */ 177 struct dasd_device *memdev; /* the device used to allocate this */ 178 struct dasd_device *startdev; /* device the request is started on */ 179 struct dasd_device *basedev; /* base device if no block->base */ 180 void *cpaddr; /* address of ccw or tcw */ 181 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ 182 char status; /* status of this request */ 183 short retries; /* A retry counter */ 184 unsigned long flags; /* flags of this request */ 185 186 /* ... and how */ 187 unsigned long starttime; /* jiffies time of request start */ 188 unsigned long expires; /* expiration period in jiffies */ 189 char lpm; /* logical path mask */ 190 void *data; /* pointer to data area */ 191 192 /* these are important for recovering erroneous requests */ 193 int intrc; /* internal error, e.g. from start_IO */ 194 struct irb irb; /* device status in case of an error */ 195 struct dasd_ccw_req *refers; /* ERP-chain queueing. */ 196 void *function; /* originating ERP action */ 197 198 /* these are for statistics only */ 199 unsigned long long buildclk; /* TOD-clock of request generation */ 200 unsigned long long startclk; /* TOD-clock of request start */ 201 unsigned long long stopclk; /* TOD-clock of request interrupt */ 202 unsigned long long endclk; /* TOD-clock of request termination */ 203 204 /* Callback that is called after reaching final status. */ 205 void (*callback)(struct dasd_ccw_req *, void *data); 206 void *callback_data; 207 }; 208 209 /* 210 * dasd_ccw_req -> status can be: 211 */ 212 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ 213 #define DASD_CQR_DONE 0x01 /* request is completed successfully */ 214 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */ 215 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */ 216 #define DASD_CQR_FAILED 0x04 /* request is finally failed */ 217 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */ 218 219 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */ 220 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */ 221 #define DASD_CQR_ERROR 0x82 /* request is completed with error */ 222 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */ 223 #define DASD_CQR_CLEARED 0x84 /* request was cleared */ 224 #define DASD_CQR_SUCCESS 0x85 /* request was successful */ 225 226 /* default expiration time*/ 227 #define DASD_EXPIRES 300 228 #define DASD_EXPIRES_MAX 40000000 229 #define DASD_RETRIES 256 230 #define DASD_RETRIES_MAX 32768 231 232 /* per dasd_ccw_req flags */ 233 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ 234 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ 235 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */ 236 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was 237 * stolen. Should not be combined with 238 * DASD_CQR_FLAGS_USE_ERP 239 */ 240 /* 241 * The following flags are used to suppress output of certain errors. 242 * These flags should only be used for format checks! 243 */ 244 #define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */ 245 #define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/ 246 #define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */ 247 248 /* Signature for error recovery functions. */ 249 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 250 251 /* 252 * A single CQR can only contain a maximum of 255 CCWs. It is limited by 253 * the locate record and locate record extended count value which can only hold 254 * 1 Byte max. 255 */ 256 #define DASD_CQR_MAX_CCW 255 257 258 /* 259 * Unique identifier for dasd device. 260 */ 261 #define UA_NOT_CONFIGURED 0x00 262 #define UA_BASE_DEVICE 0x01 263 #define UA_BASE_PAV_ALIAS 0x02 264 #define UA_HYPER_PAV_ALIAS 0x03 265 266 struct dasd_uid { 267 __u8 type; 268 char vendor[4]; 269 char serial[15]; 270 __u16 ssid; 271 __u8 real_unit_addr; 272 __u8 base_unit_addr; 273 char vduit[33]; 274 }; 275 276 /* 277 * the struct dasd_discipline is 278 * sth like a table of virtual functions, if you think of dasd_eckd 279 * inheriting dasd... 280 * no, currently we are not planning to reimplement the driver in C++ 281 */ 282 struct dasd_discipline { 283 struct module *owner; 284 char ebcname[8]; /* a name used for tagging and printks */ 285 char name[8]; /* a name used for tagging and printks */ 286 int max_blocks; /* maximum number of blocks to be chained */ 287 288 struct list_head list; /* used for list of disciplines */ 289 290 /* 291 * Device recognition functions. check_device is used to verify 292 * the sense data and the information returned by read device 293 * characteristics. It returns 0 if the discipline can be used 294 * for the device in question. uncheck_device is called during 295 * device shutdown to deregister a device from its discipline. 296 */ 297 int (*check_device) (struct dasd_device *); 298 void (*uncheck_device) (struct dasd_device *); 299 300 /* 301 * do_analysis is used in the step from device state "basic" to 302 * state "accept". It returns 0 if the device can be made ready, 303 * it returns -EMEDIUMTYPE if the device can't be made ready or 304 * -EAGAIN if do_analysis started a ccw that needs to complete 305 * before the analysis may be repeated. 306 */ 307 int (*do_analysis) (struct dasd_block *); 308 309 /* 310 * This function is called, when new paths become available. 311 * Disciplins may use this callback to do necessary setup work, 312 * e.g. verify that new path is compatible with the current 313 * configuration. 314 */ 315 int (*verify_path)(struct dasd_device *, __u8); 316 317 /* 318 * Last things to do when a device is set online, and first things 319 * when it is set offline. 320 */ 321 int (*basic_to_ready) (struct dasd_device *); 322 int (*online_to_ready) (struct dasd_device *); 323 int (*basic_to_known)(struct dasd_device *); 324 325 /* (struct dasd_device *); 326 * Device operation functions. build_cp creates a ccw chain for 327 * a block device request, start_io starts the request and 328 * term_IO cancels it (e.g. in case of a timeout). format_device 329 * formats the device and check_device_format compares the format of 330 * a device with the expected format_data. 331 * handle_terminated_request allows to examine a cqr and prepare 332 * it for retry. 333 */ 334 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 335 struct dasd_block *, 336 struct request *); 337 int (*start_IO) (struct dasd_ccw_req *); 338 int (*term_IO) (struct dasd_ccw_req *); 339 void (*handle_terminated_request) (struct dasd_ccw_req *); 340 int (*format_device) (struct dasd_device *, 341 struct format_data_t *, int); 342 int (*check_device_format)(struct dasd_device *, 343 struct format_check_t *, int); 344 int (*free_cp) (struct dasd_ccw_req *, struct request *); 345 346 /* 347 * Error recovery functions. examine_error() returns a value that 348 * indicates what to do for an error condition. If examine_error() 349 * returns 'dasd_era_recover' erp_action() is called to create a 350 * special error recovery ccw. erp_postaction() is called after 351 * an error recovery ccw has finished its execution. dump_sense 352 * is called for every error condition to print the sense data 353 * to the console. 354 */ 355 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 356 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 357 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 358 struct irb *); 359 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 360 void (*check_for_device_change) (struct dasd_device *, 361 struct dasd_ccw_req *, 362 struct irb *); 363 364 /* i/o control functions. */ 365 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 366 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 367 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 368 369 /* suspend/resume functions */ 370 int (*freeze) (struct dasd_device *); 371 int (*restore) (struct dasd_device *); 372 373 /* reload device after state change */ 374 int (*reload) (struct dasd_device *); 375 376 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 377 void (*kick_validate) (struct dasd_device *); 378 int (*check_attention)(struct dasd_device *, __u8); 379 int (*host_access_count)(struct dasd_device *); 380 int (*hosts_print)(struct dasd_device *, struct seq_file *); 381 void (*handle_hpf_error)(struct dasd_device *, struct irb *); 382 void (*disable_hpf)(struct dasd_device *); 383 int (*hpf_enabled)(struct dasd_device *); 384 void (*reset_path)(struct dasd_device *, __u8); 385 }; 386 387 extern struct dasd_discipline *dasd_diag_discipline_pointer; 388 389 /* 390 * Notification numbers for extended error reporting notifications: 391 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 392 * eer pointer) is freed. The error reporting module needs to do all necessary 393 * cleanup steps. 394 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 395 */ 396 #define DASD_EER_DISABLE 0 397 #define DASD_EER_TRIGGER 1 398 399 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 400 #define DASD_EER_FATALERROR 1 401 #define DASD_EER_NOPATH 2 402 #define DASD_EER_STATECHANGE 3 403 #define DASD_EER_PPRCSUSPEND 4 404 405 /* DASD path handling */ 406 407 #define DASD_PATH_OPERATIONAL 1 408 #define DASD_PATH_TBV 2 409 #define DASD_PATH_PP 3 410 #define DASD_PATH_NPP 4 411 #define DASD_PATH_MISCABLED 5 412 #define DASD_PATH_NOHPF 6 413 #define DASD_PATH_CUIR 7 414 #define DASD_PATH_IFCC 8 415 416 #define DASD_THRHLD_MAX 4294967295U 417 #define DASD_INTERVAL_MAX 4294967295U 418 419 struct dasd_path { 420 unsigned long flags; 421 u8 cssid; 422 u8 ssid; 423 u8 chpid; 424 struct dasd_conf_data *conf_data; 425 atomic_t error_count; 426 unsigned long long errorclk; 427 }; 428 429 430 struct dasd_profile_info { 431 /* legacy part of profile data, as in dasd_profile_info_t */ 432 unsigned int dasd_io_reqs; /* number of requests processed */ 433 unsigned int dasd_io_sects; /* number of sectors processed */ 434 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 435 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 436 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 437 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 438 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 439 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 440 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 441 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 442 443 /* new data */ 444 struct timespec starttod; /* time of start or last reset */ 445 unsigned int dasd_io_alias; /* requests using an alias */ 446 unsigned int dasd_io_tpm; /* requests using transport mode */ 447 unsigned int dasd_read_reqs; /* total number of read requests */ 448 unsigned int dasd_read_sects; /* total number read sectors */ 449 unsigned int dasd_read_alias; /* read request using an alias */ 450 unsigned int dasd_read_tpm; /* read requests in transport mode */ 451 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 452 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 453 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 454 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 455 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 456 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 457 }; 458 459 struct dasd_profile { 460 struct dentry *dentry; 461 struct dasd_profile_info *data; 462 spinlock_t lock; 463 }; 464 465 struct dasd_device { 466 /* Block device stuff. */ 467 struct dasd_block *block; 468 469 unsigned int devindex; 470 unsigned long flags; /* per device flags */ 471 unsigned short features; /* copy of devmap-features (read-only!) */ 472 473 /* extended error reporting stuff (eer) */ 474 struct dasd_ccw_req *eer_cqr; 475 476 /* Device discipline stuff. */ 477 struct dasd_discipline *discipline; 478 struct dasd_discipline *base_discipline; 479 void *private; 480 struct dasd_path path[8]; 481 __u8 opm; 482 483 /* Device state and target state. */ 484 int state, target; 485 struct mutex state_mutex; 486 int stopped; /* device (ccw_device_start) was stopped */ 487 488 /* reference count. */ 489 atomic_t ref_count; 490 491 /* ccw queue and memory for static ccw/erp buffers. */ 492 struct list_head ccw_queue; 493 spinlock_t mem_lock; 494 void *ccw_mem; 495 void *erp_mem; 496 struct list_head ccw_chunks; 497 struct list_head erp_chunks; 498 499 atomic_t tasklet_scheduled; 500 struct tasklet_struct tasklet; 501 struct work_struct kick_work; 502 struct work_struct restore_device; 503 struct work_struct reload_device; 504 struct work_struct kick_validate; 505 struct work_struct suc_work; 506 struct work_struct requeue_requests; 507 struct timer_list timer; 508 509 debug_info_t *debug_area; 510 511 struct ccw_device *cdev; 512 513 /* hook for alias management */ 514 struct list_head alias_list; 515 516 /* default expiration time in s */ 517 unsigned long default_expires; 518 unsigned long default_retries; 519 520 unsigned long blk_timeout; 521 522 unsigned long path_thrhld; 523 unsigned long path_interval; 524 525 struct dentry *debugfs_dentry; 526 struct dentry *hosts_dentry; 527 struct dasd_profile profile; 528 }; 529 530 struct dasd_block { 531 /* Block device stuff. */ 532 struct gendisk *gdp; 533 struct request_queue *request_queue; 534 spinlock_t request_queue_lock; 535 struct block_device *bdev; 536 atomic_t open_count; 537 538 unsigned long long blocks; /* size of volume in blocks */ 539 unsigned int bp_block; /* bytes per block */ 540 unsigned int s2b_shift; /* log2 (bp_block/512) */ 541 542 struct dasd_device *base; 543 struct list_head ccw_queue; 544 spinlock_t queue_lock; 545 546 atomic_t tasklet_scheduled; 547 struct tasklet_struct tasklet; 548 struct timer_list timer; 549 550 struct dentry *debugfs_dentry; 551 struct dasd_profile profile; 552 }; 553 554 struct dasd_attention_data { 555 struct dasd_device *device; 556 __u8 lpum; 557 }; 558 559 /* reasons why device (ccw_device_start) was stopped */ 560 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 561 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 562 #define DASD_STOPPED_PENDING 4 /* long busy */ 563 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 564 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 565 #define DASD_STOPPED_PM 32 /* pm state transition */ 566 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 567 568 /* per device flags */ 569 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 570 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 571 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 572 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 573 * confuse this with the user specified 574 * read-only feature. 575 */ 576 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 577 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 578 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 579 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ 580 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ 581 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ 582 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ 583 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */ 584 585 #define DASD_SLEEPON_START_TAG ((void *) 1) 586 #define DASD_SLEEPON_END_TAG ((void *) 2) 587 588 void dasd_put_device_wake(struct dasd_device *); 589 590 /* 591 * Reference count inliners 592 */ 593 static inline void 594 dasd_get_device(struct dasd_device *device) 595 { 596 atomic_inc(&device->ref_count); 597 } 598 599 static inline void 600 dasd_put_device(struct dasd_device *device) 601 { 602 if (atomic_dec_return(&device->ref_count) == 0) 603 dasd_put_device_wake(device); 604 } 605 606 /* 607 * The static memory in ccw_mem and erp_mem is managed by a sorted 608 * list of free memory chunks. 609 */ 610 struct dasd_mchunk 611 { 612 struct list_head list; 613 unsigned long size; 614 } __attribute__ ((aligned(8))); 615 616 static inline void 617 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 618 unsigned long size) 619 { 620 struct dasd_mchunk *chunk; 621 622 INIT_LIST_HEAD(chunk_list); 623 chunk = (struct dasd_mchunk *) mem; 624 chunk->size = size - sizeof(struct dasd_mchunk); 625 list_add(&chunk->list, chunk_list); 626 } 627 628 static inline void * 629 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 630 { 631 struct dasd_mchunk *chunk, *tmp; 632 633 size = (size + 7L) & -8L; 634 list_for_each_entry(chunk, chunk_list, list) { 635 if (chunk->size < size) 636 continue; 637 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 638 char *endaddr = (char *) (chunk + 1) + chunk->size; 639 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 640 tmp->size = size; 641 chunk->size -= size + sizeof(struct dasd_mchunk); 642 chunk = tmp; 643 } else 644 list_del(&chunk->list); 645 return (void *) (chunk + 1); 646 } 647 return NULL; 648 } 649 650 static inline void 651 dasd_free_chunk(struct list_head *chunk_list, void *mem) 652 { 653 struct dasd_mchunk *chunk, *tmp; 654 struct list_head *p, *left; 655 656 chunk = (struct dasd_mchunk *) 657 ((char *) mem - sizeof(struct dasd_mchunk)); 658 /* Find out the left neighbour in chunk_list. */ 659 left = chunk_list; 660 list_for_each(p, chunk_list) { 661 if (list_entry(p, struct dasd_mchunk, list) > chunk) 662 break; 663 left = p; 664 } 665 /* Try to merge with right neighbour = next element from left. */ 666 if (left->next != chunk_list) { 667 tmp = list_entry(left->next, struct dasd_mchunk, list); 668 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 669 list_del(&tmp->list); 670 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 671 } 672 } 673 /* Try to merge with left neighbour. */ 674 if (left != chunk_list) { 675 tmp = list_entry(left, struct dasd_mchunk, list); 676 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 677 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 678 return; 679 } 680 } 681 __list_add(&chunk->list, left, left->next); 682 } 683 684 /* 685 * Check if bsize is in { 512, 1024, 2048, 4096 } 686 */ 687 static inline int 688 dasd_check_blocksize(int bsize) 689 { 690 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 691 return -EMEDIUMTYPE; 692 return 0; 693 } 694 695 /* externals in dasd.c */ 696 #define DASD_PROFILE_OFF 0 697 #define DASD_PROFILE_ON 1 698 #define DASD_PROFILE_GLOBAL_ONLY 2 699 700 extern debug_info_t *dasd_debug_area; 701 extern struct dasd_profile dasd_global_profile; 702 extern unsigned int dasd_global_profile_level; 703 extern const struct block_device_operations dasd_device_operations; 704 705 extern struct kmem_cache *dasd_page_cache; 706 707 struct dasd_ccw_req * 708 dasd_kmalloc_request(int , int, int, struct dasd_device *); 709 struct dasd_ccw_req * 710 dasd_smalloc_request(int , int, int, struct dasd_device *); 711 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *); 712 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 713 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 714 715 static inline int 716 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device) 717 { 718 return set_normalized_cda(ccw, cda); 719 } 720 721 struct dasd_device *dasd_alloc_device(void); 722 void dasd_free_device(struct dasd_device *); 723 724 struct dasd_block *dasd_alloc_block(void); 725 void dasd_free_block(struct dasd_block *); 726 727 enum blk_eh_timer_return dasd_times_out(struct request *req); 728 729 void dasd_enable_device(struct dasd_device *); 730 void dasd_set_target_state(struct dasd_device *, int); 731 void dasd_kick_device(struct dasd_device *); 732 void dasd_restore_device(struct dasd_device *); 733 void dasd_reload_device(struct dasd_device *); 734 void dasd_schedule_requeue(struct dasd_device *); 735 736 void dasd_add_request_head(struct dasd_ccw_req *); 737 void dasd_add_request_tail(struct dasd_ccw_req *); 738 int dasd_start_IO(struct dasd_ccw_req *); 739 int dasd_term_IO(struct dasd_ccw_req *); 740 void dasd_schedule_device_bh(struct dasd_device *); 741 void dasd_schedule_block_bh(struct dasd_block *); 742 int dasd_sleep_on(struct dasd_ccw_req *); 743 int dasd_sleep_on_queue(struct list_head *); 744 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 745 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 746 void dasd_device_set_timer(struct dasd_device *, int); 747 void dasd_device_clear_timer(struct dasd_device *); 748 void dasd_block_set_timer(struct dasd_block *, int); 749 void dasd_block_clear_timer(struct dasd_block *); 750 int dasd_cancel_req(struct dasd_ccw_req *); 751 int dasd_flush_device_queue(struct dasd_device *); 752 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 753 void dasd_generic_free_discipline(struct dasd_device *); 754 void dasd_generic_remove (struct ccw_device *cdev); 755 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 756 int dasd_generic_set_offline (struct ccw_device *cdev); 757 int dasd_generic_notify(struct ccw_device *, int); 758 int dasd_generic_last_path_gone(struct dasd_device *); 759 int dasd_generic_path_operational(struct dasd_device *); 760 void dasd_generic_shutdown(struct ccw_device *); 761 762 void dasd_generic_handle_state_change(struct dasd_device *); 763 int dasd_generic_pm_freeze(struct ccw_device *); 764 int dasd_generic_restore_device(struct ccw_device *); 765 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 766 void dasd_generic_path_event(struct ccw_device *, int *); 767 int dasd_generic_verify_path(struct dasd_device *, __u8); 768 769 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 770 char *dasd_get_sense(struct irb *); 771 772 void dasd_device_set_stop_bits(struct dasd_device *, int); 773 void dasd_device_remove_stop_bits(struct dasd_device *, int); 774 775 int dasd_device_is_ro(struct dasd_device *); 776 777 void dasd_profile_reset(struct dasd_profile *); 778 int dasd_profile_on(struct dasd_profile *); 779 void dasd_profile_off(struct dasd_profile *); 780 char *dasd_get_user_string(const char __user *, size_t); 781 782 /* externals in dasd_devmap.c */ 783 extern int dasd_max_devindex; 784 extern int dasd_probeonly; 785 extern int dasd_autodetect; 786 extern int dasd_nopav; 787 extern int dasd_nofcx; 788 789 int dasd_devmap_init(void); 790 void dasd_devmap_exit(void); 791 792 struct dasd_device *dasd_create_device(struct ccw_device *); 793 void dasd_delete_device(struct dasd_device *); 794 795 int dasd_get_feature(struct ccw_device *, int); 796 int dasd_set_feature(struct ccw_device *, int, int); 797 798 int dasd_add_sysfs_files(struct ccw_device *); 799 void dasd_remove_sysfs_files(struct ccw_device *); 800 801 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 802 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 803 struct dasd_device *dasd_device_from_devindex(int); 804 805 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 806 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 807 808 int dasd_parse(void) __init; 809 int dasd_busid_known(const char *); 810 811 /* externals in dasd_gendisk.c */ 812 int dasd_gendisk_init(void); 813 void dasd_gendisk_exit(void); 814 int dasd_gendisk_alloc(struct dasd_block *); 815 void dasd_gendisk_free(struct dasd_block *); 816 int dasd_scan_partitions(struct dasd_block *); 817 void dasd_destroy_partitions(struct dasd_block *); 818 819 /* externals in dasd_ioctl.c */ 820 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 821 822 /* externals in dasd_proc.c */ 823 int dasd_proc_init(void); 824 void dasd_proc_exit(void); 825 826 /* externals in dasd_erp.c */ 827 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 828 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 829 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 830 struct dasd_device *); 831 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 832 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 833 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 834 835 /* externals in dasd_3990_erp.c */ 836 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 837 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 838 839 /* externals in dasd_eer.c */ 840 #ifdef CONFIG_DASD_EER 841 int dasd_eer_init(void); 842 void dasd_eer_exit(void); 843 int dasd_eer_enable(struct dasd_device *); 844 void dasd_eer_disable(struct dasd_device *); 845 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 846 unsigned int id); 847 void dasd_eer_snss(struct dasd_device *); 848 849 static inline int dasd_eer_enabled(struct dasd_device *device) 850 { 851 return device->eer_cqr != NULL; 852 } 853 #else 854 #define dasd_eer_init() (0) 855 #define dasd_eer_exit() do { } while (0) 856 #define dasd_eer_enable(d) (0) 857 #define dasd_eer_disable(d) do { } while (0) 858 #define dasd_eer_write(d,c,i) do { } while (0) 859 #define dasd_eer_snss(d) do { } while (0) 860 #define dasd_eer_enabled(d) (0) 861 #endif /* CONFIG_DASD_ERR */ 862 863 864 /* DASD path handling functions */ 865 866 /* 867 * helper functions to modify bit masks for a given channel path for a device 868 */ 869 static inline int dasd_path_is_operational(struct dasd_device *device, int chp) 870 { 871 return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 872 } 873 874 static inline int dasd_path_need_verify(struct dasd_device *device, int chp) 875 { 876 return test_bit(DASD_PATH_TBV, &device->path[chp].flags); 877 } 878 879 static inline void dasd_path_verify(struct dasd_device *device, int chp) 880 { 881 __set_bit(DASD_PATH_TBV, &device->path[chp].flags); 882 } 883 884 static inline void dasd_path_clear_verify(struct dasd_device *device, int chp) 885 { 886 __clear_bit(DASD_PATH_TBV, &device->path[chp].flags); 887 } 888 889 static inline void dasd_path_clear_all_verify(struct dasd_device *device) 890 { 891 int chp; 892 893 for (chp = 0; chp < 8; chp++) 894 dasd_path_clear_verify(device, chp); 895 } 896 897 static inline void dasd_path_operational(struct dasd_device *device, int chp) 898 { 899 __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 900 device->opm |= (0x80 >> chp); 901 } 902 903 static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp) 904 { 905 __set_bit(DASD_PATH_NPP, &device->path[chp].flags); 906 } 907 908 static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp) 909 { 910 return test_bit(DASD_PATH_NPP, &device->path[chp].flags); 911 } 912 913 static inline void dasd_path_clear_nonpreferred(struct dasd_device *device, 914 int chp) 915 { 916 __clear_bit(DASD_PATH_NPP, &device->path[chp].flags); 917 } 918 919 static inline void dasd_path_preferred(struct dasd_device *device, int chp) 920 { 921 __set_bit(DASD_PATH_PP, &device->path[chp].flags); 922 } 923 924 static inline int dasd_path_is_preferred(struct dasd_device *device, int chp) 925 { 926 return test_bit(DASD_PATH_PP, &device->path[chp].flags); 927 } 928 929 static inline void dasd_path_clear_preferred(struct dasd_device *device, 930 int chp) 931 { 932 __clear_bit(DASD_PATH_PP, &device->path[chp].flags); 933 } 934 935 static inline void dasd_path_clear_oper(struct dasd_device *device, int chp) 936 { 937 __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 938 device->opm &= ~(0x80 >> chp); 939 } 940 941 static inline void dasd_path_clear_cable(struct dasd_device *device, int chp) 942 { 943 __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 944 } 945 946 static inline void dasd_path_cuir(struct dasd_device *device, int chp) 947 { 948 __set_bit(DASD_PATH_CUIR, &device->path[chp].flags); 949 } 950 951 static inline int dasd_path_is_cuir(struct dasd_device *device, int chp) 952 { 953 return test_bit(DASD_PATH_CUIR, &device->path[chp].flags); 954 } 955 956 static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp) 957 { 958 __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags); 959 } 960 961 static inline void dasd_path_ifcc(struct dasd_device *device, int chp) 962 { 963 set_bit(DASD_PATH_IFCC, &device->path[chp].flags); 964 } 965 966 static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp) 967 { 968 return test_bit(DASD_PATH_IFCC, &device->path[chp].flags); 969 } 970 971 static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp) 972 { 973 clear_bit(DASD_PATH_IFCC, &device->path[chp].flags); 974 } 975 976 static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp) 977 { 978 __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 979 } 980 981 static inline void dasd_path_miscabled(struct dasd_device *device, int chp) 982 { 983 __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 984 } 985 986 static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp) 987 { 988 return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 989 } 990 991 static inline void dasd_path_nohpf(struct dasd_device *device, int chp) 992 { 993 __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 994 } 995 996 static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp) 997 { 998 return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 999 } 1000 1001 /* 1002 * get functions for path masks 1003 * will return a path masks for the given device 1004 */ 1005 1006 static inline __u8 dasd_path_get_opm(struct dasd_device *device) 1007 { 1008 return device->opm; 1009 } 1010 1011 static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device) 1012 { 1013 int chp; 1014 __u8 tbvpm = 0x00; 1015 1016 for (chp = 0; chp < 8; chp++) 1017 if (dasd_path_need_verify(device, chp)) 1018 tbvpm |= 0x80 >> chp; 1019 return tbvpm; 1020 } 1021 1022 static inline __u8 dasd_path_get_nppm(struct dasd_device *device) 1023 { 1024 int chp; 1025 __u8 npm = 0x00; 1026 1027 for (chp = 0; chp < 8; chp++) { 1028 if (dasd_path_is_nonpreferred(device, chp)) 1029 npm |= 0x80 >> chp; 1030 } 1031 return npm; 1032 } 1033 1034 static inline __u8 dasd_path_get_ppm(struct dasd_device *device) 1035 { 1036 int chp; 1037 __u8 ppm = 0x00; 1038 1039 for (chp = 0; chp < 8; chp++) 1040 if (dasd_path_is_preferred(device, chp)) 1041 ppm |= 0x80 >> chp; 1042 return ppm; 1043 } 1044 1045 static inline __u8 dasd_path_get_cablepm(struct dasd_device *device) 1046 { 1047 int chp; 1048 __u8 cablepm = 0x00; 1049 1050 for (chp = 0; chp < 8; chp++) 1051 if (dasd_path_is_miscabled(device, chp)) 1052 cablepm |= 0x80 >> chp; 1053 return cablepm; 1054 } 1055 1056 static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device) 1057 { 1058 int chp; 1059 __u8 cuirpm = 0x00; 1060 1061 for (chp = 0; chp < 8; chp++) 1062 if (dasd_path_is_cuir(device, chp)) 1063 cuirpm |= 0x80 >> chp; 1064 return cuirpm; 1065 } 1066 1067 static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device) 1068 { 1069 int chp; 1070 __u8 ifccpm = 0x00; 1071 1072 for (chp = 0; chp < 8; chp++) 1073 if (dasd_path_is_ifcc(device, chp)) 1074 ifccpm |= 0x80 >> chp; 1075 return ifccpm; 1076 } 1077 1078 static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device) 1079 { 1080 int chp; 1081 __u8 hpfpm = 0x00; 1082 1083 for (chp = 0; chp < 8; chp++) 1084 if (dasd_path_is_nohpf(device, chp)) 1085 hpfpm |= 0x80 >> chp; 1086 return hpfpm; 1087 } 1088 1089 /* 1090 * add functions for path masks 1091 * the existing path mask will be extended by the given path mask 1092 */ 1093 static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm) 1094 { 1095 int chp; 1096 1097 for (chp = 0; chp < 8; chp++) 1098 if (pm & (0x80 >> chp)) 1099 dasd_path_verify(device, chp); 1100 } 1101 1102 static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device) 1103 { 1104 int chp; 1105 __u8 nopm = 0x00; 1106 1107 for (chp = 0; chp < 8; chp++) 1108 if (dasd_path_is_nohpf(device, chp) || 1109 dasd_path_is_ifcc(device, chp) || 1110 dasd_path_is_cuir(device, chp) || 1111 dasd_path_is_miscabled(device, chp)) 1112 nopm |= 0x80 >> chp; 1113 return nopm; 1114 } 1115 1116 static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm) 1117 { 1118 int chp; 1119 1120 for (chp = 0; chp < 8; chp++) 1121 if (pm & (0x80 >> chp)) { 1122 dasd_path_operational(device, chp); 1123 /* 1124 * if the path is used 1125 * it should not be in one of the negative lists 1126 */ 1127 dasd_path_clear_nohpf(device, chp); 1128 dasd_path_clear_cuir(device, chp); 1129 dasd_path_clear_cable(device, chp); 1130 dasd_path_clear_ifcc(device, chp); 1131 } 1132 } 1133 1134 static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm) 1135 { 1136 int chp; 1137 1138 for (chp = 0; chp < 8; chp++) 1139 if (pm & (0x80 >> chp)) 1140 dasd_path_miscabled(device, chp); 1141 } 1142 1143 static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm) 1144 { 1145 int chp; 1146 1147 for (chp = 0; chp < 8; chp++) 1148 if (pm & (0x80 >> chp)) 1149 dasd_path_cuir(device, chp); 1150 } 1151 1152 static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm) 1153 { 1154 int chp; 1155 1156 for (chp = 0; chp < 8; chp++) 1157 if (pm & (0x80 >> chp)) 1158 dasd_path_ifcc(device, chp); 1159 } 1160 1161 static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm) 1162 { 1163 int chp; 1164 1165 for (chp = 0; chp < 8; chp++) 1166 if (pm & (0x80 >> chp)) 1167 dasd_path_nonpreferred(device, chp); 1168 } 1169 1170 static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm) 1171 { 1172 int chp; 1173 1174 for (chp = 0; chp < 8; chp++) 1175 if (pm & (0x80 >> chp)) 1176 dasd_path_nohpf(device, chp); 1177 } 1178 1179 static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm) 1180 { 1181 int chp; 1182 1183 for (chp = 0; chp < 8; chp++) 1184 if (pm & (0x80 >> chp)) 1185 dasd_path_preferred(device, chp); 1186 } 1187 1188 /* 1189 * set functions for path masks 1190 * the existing path mask will be replaced by the given path mask 1191 */ 1192 static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm) 1193 { 1194 int chp; 1195 1196 for (chp = 0; chp < 8; chp++) 1197 if (pm & (0x80 >> chp)) 1198 dasd_path_verify(device, chp); 1199 else 1200 dasd_path_clear_verify(device, chp); 1201 } 1202 1203 static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm) 1204 { 1205 int chp; 1206 1207 for (chp = 0; chp < 8; chp++) { 1208 dasd_path_clear_oper(device, chp); 1209 if (pm & (0x80 >> chp)) { 1210 dasd_path_operational(device, chp); 1211 /* 1212 * if the path is used 1213 * it should not be in one of the negative lists 1214 */ 1215 dasd_path_clear_nohpf(device, chp); 1216 dasd_path_clear_cuir(device, chp); 1217 dasd_path_clear_cable(device, chp); 1218 dasd_path_clear_ifcc(device, chp); 1219 } 1220 } 1221 } 1222 1223 /* 1224 * remove functions for path masks 1225 * the existing path mask will be cleared with the given path mask 1226 */ 1227 static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm) 1228 { 1229 int chp; 1230 1231 for (chp = 0; chp < 8; chp++) { 1232 if (pm & (0x80 >> chp)) 1233 dasd_path_clear_oper(device, chp); 1234 } 1235 } 1236 1237 /* 1238 * add the newly available path to the to be verified pm and remove it from 1239 * normal operation until it is verified 1240 */ 1241 static inline void dasd_path_available(struct dasd_device *device, int chp) 1242 { 1243 dasd_path_clear_oper(device, chp); 1244 dasd_path_verify(device, chp); 1245 } 1246 1247 static inline void dasd_path_notoper(struct dasd_device *device, int chp) 1248 { 1249 dasd_path_clear_oper(device, chp); 1250 dasd_path_clear_preferred(device, chp); 1251 dasd_path_clear_nonpreferred(device, chp); 1252 } 1253 1254 /* 1255 * remove all paths from normal operation 1256 */ 1257 static inline void dasd_path_no_path(struct dasd_device *device) 1258 { 1259 int chp; 1260 1261 for (chp = 0; chp < 8; chp++) 1262 dasd_path_notoper(device, chp); 1263 1264 dasd_path_clear_all_verify(device); 1265 } 1266 1267 /* end - path handling */ 1268 1269 #endif /* DASD_H */ 1270