1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> 4 * Horst Hummel <Horst.Hummel@de.ibm.com> 5 * Martin Schwidefsky <schwidefsky@de.ibm.com> 6 * Bugreports.to..: <Linux390@de.ibm.com> 7 * Copyright IBM Corp. 1999, 2009 8 */ 9 10 #ifndef DASD_INT_H 11 #define DASD_INT_H 12 13 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */ 14 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS)) 15 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1) 16 17 /* 18 * States a dasd device can have: 19 * new: the dasd_device structure is allocated. 20 * known: the discipline for the device is identified. 21 * basic: the device can do basic i/o. 22 * unfmt: the device could not be analyzed (format is unknown). 23 * ready: partition detection is done and the device is can do block io. 24 * online: the device accepts requests from the block device queue. 25 * 26 * Things to do for startup state transitions: 27 * new -> known: find discipline for the device and create devfs entries. 28 * known -> basic: request irq line for the device. 29 * basic -> ready: do the initial analysis, e.g. format detection, 30 * do block device setup and detect partitions. 31 * ready -> online: schedule the device tasklet. 32 * Things to do for shutdown state transitions: 33 * online -> ready: just set the new device state. 34 * ready -> basic: flush requests from the block device layer, clear 35 * partition information and reset format information. 36 * basic -> known: terminate all requests and free irq. 37 * known -> new: remove devfs entries and forget discipline. 38 */ 39 40 #define DASD_STATE_NEW 0 41 #define DASD_STATE_KNOWN 1 42 #define DASD_STATE_BASIC 2 43 #define DASD_STATE_UNFMT 3 44 #define DASD_STATE_READY 4 45 #define DASD_STATE_ONLINE 5 46 47 #include <linux/module.h> 48 #include <linux/wait.h> 49 #include <linux/blkdev.h> 50 #include <linux/genhd.h> 51 #include <linux/hdreg.h> 52 #include <linux/interrupt.h> 53 #include <linux/log2.h> 54 #include <asm/ccwdev.h> 55 #include <linux/workqueue.h> 56 #include <asm/debug.h> 57 #include <asm/dasd.h> 58 #include <asm/idals.h> 59 #include <linux/bitops.h> 60 #include <linux/blk-mq.h> 61 62 /* DASD discipline magic */ 63 #define DASD_ECKD_MAGIC 0xC5C3D2C4 64 #define DASD_DIAG_MAGIC 0xC4C9C1C7 65 #define DASD_FBA_MAGIC 0xC6C2C140 66 67 /* 68 * SECTION: Type definitions 69 */ 70 struct dasd_device; 71 struct dasd_block; 72 73 /* BIT DEFINITIONS FOR SENSE DATA */ 74 #define DASD_SENSE_BIT_0 0x80 75 #define DASD_SENSE_BIT_1 0x40 76 #define DASD_SENSE_BIT_2 0x20 77 #define DASD_SENSE_BIT_3 0x10 78 79 /* BIT DEFINITIONS FOR SIM SENSE */ 80 #define DASD_SIM_SENSE 0x0F 81 #define DASD_SIM_MSG_TO_OP 0x03 82 #define DASD_SIM_LOG 0x0C 83 84 /* lock class for nested cdev lock */ 85 #define CDEV_NESTED_FIRST 1 86 #define CDEV_NESTED_SECOND 2 87 88 /* 89 * SECTION: MACROs for klogd and s390 debug feature (dbf) 90 */ 91 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \ 92 do { \ 93 debug_sprintf_event(d_device->debug_area, \ 94 d_level, \ 95 d_str "\n", \ 96 d_data); \ 97 } while(0) 98 99 #define DBF_EVENT(d_level, d_str, d_data...)\ 100 do { \ 101 debug_sprintf_event(dasd_debug_area, \ 102 d_level,\ 103 d_str "\n", \ 104 d_data); \ 105 } while(0) 106 107 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \ 108 do { \ 109 struct ccw_dev_id __dev_id; \ 110 ccw_device_get_id(d_cdev, &__dev_id); \ 111 debug_sprintf_event(dasd_debug_area, \ 112 d_level, \ 113 "0.%x.%04x " d_str "\n", \ 114 __dev_id.ssid, __dev_id.devno, d_data); \ 115 } while (0) 116 117 /* limit size for an errorstring */ 118 #define ERRORLENGTH 30 119 120 /* definition of dbf debug levels */ 121 #define DBF_EMERG 0 /* system is unusable */ 122 #define DBF_ALERT 1 /* action must be taken immediately */ 123 #define DBF_CRIT 2 /* critical conditions */ 124 #define DBF_ERR 3 /* error conditions */ 125 #define DBF_WARNING 4 /* warning conditions */ 126 #define DBF_NOTICE 5 /* normal but significant condition */ 127 #define DBF_INFO 6 /* informational */ 128 #define DBF_DEBUG 6 /* debug-level messages */ 129 130 /* messages to be written via klogd and dbf */ 131 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\ 132 do { \ 133 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \ 134 dev_name(&d_device->cdev->dev), d_args); \ 135 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \ 136 } while(0) 137 138 #define MESSAGE(d_loglevel,d_string,d_args...)\ 139 do { \ 140 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 141 DBF_EVENT(DBF_ALERT, d_string, d_args); \ 142 } while(0) 143 144 /* messages to be written via klogd only */ 145 #define DEV_MESSAGE_LOG(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 } while(0) 150 151 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\ 152 do { \ 153 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \ 154 } while(0) 155 156 /* Macro to calculate number of blocks per page */ 157 #define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize) 158 159 struct dasd_ccw_req { 160 unsigned int magic; /* Eye catcher */ 161 int intrc; /* internal error, e.g. from start_IO */ 162 struct list_head devlist; /* for dasd_device request queue */ 163 struct list_head blocklist; /* for dasd_block request queue */ 164 struct dasd_block *block; /* the originating block device */ 165 struct dasd_device *memdev; /* the device used to allocate this */ 166 struct dasd_device *startdev; /* device the request is started on */ 167 struct dasd_device *basedev; /* base device if no block->base */ 168 void *cpaddr; /* address of ccw or tcw */ 169 short retries; /* A retry counter */ 170 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */ 171 char status; /* status of this request */ 172 char lpm; /* logical path mask */ 173 unsigned long flags; /* flags of this request */ 174 struct dasd_queue *dq; 175 unsigned long starttime; /* jiffies time of request start */ 176 unsigned long expires; /* expiration period in jiffies */ 177 void *data; /* pointer to data area */ 178 struct irb irb; /* device status in case of an error */ 179 struct dasd_ccw_req *refers; /* ERP-chain queueing. */ 180 void *function; /* originating ERP action */ 181 void *mem_chunk; 182 183 unsigned long buildclk; /* TOD-clock of request generation */ 184 unsigned long startclk; /* TOD-clock of request start */ 185 unsigned long stopclk; /* TOD-clock of request interrupt */ 186 unsigned long endclk; /* TOD-clock of request termination */ 187 188 void (*callback)(struct dasd_ccw_req *, void *data); 189 void *callback_data; 190 }; 191 192 /* 193 * dasd_ccw_req -> status can be: 194 */ 195 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */ 196 #define DASD_CQR_DONE 0x01 /* request is completed successfully */ 197 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */ 198 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */ 199 #define DASD_CQR_FAILED 0x04 /* request is finally failed */ 200 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */ 201 202 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */ 203 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */ 204 #define DASD_CQR_ERROR 0x82 /* request is completed with error */ 205 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */ 206 #define DASD_CQR_CLEARED 0x84 /* request was cleared */ 207 #define DASD_CQR_SUCCESS 0x85 /* request was successful */ 208 209 /* default expiration time*/ 210 #define DASD_EXPIRES 300 211 #define DASD_EXPIRES_MAX 40000000 212 #define DASD_RETRIES 256 213 #define DASD_RETRIES_MAX 32768 214 215 /* per dasd_ccw_req flags */ 216 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */ 217 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */ 218 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */ 219 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was 220 * stolen. Should not be combined with 221 * DASD_CQR_FLAGS_USE_ERP 222 */ 223 /* 224 * The following flags are used to suppress output of certain errors. 225 */ 226 #define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */ 227 #define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/ 228 #define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */ 229 #define DASD_CQR_SUPPRESS_CR 7 /* Suppress 'Command Reject' error */ 230 231 #define DASD_REQ_PER_DEV 4 232 233 /* Signature for error recovery functions. */ 234 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *); 235 236 /* 237 * A single CQR can only contain a maximum of 255 CCWs. It is limited by 238 * the locate record and locate record extended count value which can only hold 239 * 1 Byte max. 240 */ 241 #define DASD_CQR_MAX_CCW 255 242 243 /* 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 */ 271 272 struct list_head list; /* used for list of disciplines */ 273 274 /* 275 * Device recognition functions. check_device is used to verify 276 * the sense data and the information returned by read device 277 * characteristics. It returns 0 if the discipline can be used 278 * for the device in question. uncheck_device is called during 279 * device shutdown to deregister a device from its discipline. 280 */ 281 int (*check_device) (struct dasd_device *); 282 void (*uncheck_device) (struct dasd_device *); 283 284 /* 285 * do_analysis is used in the step from device state "basic" to 286 * state "accept". It returns 0 if the device can be made ready, 287 * it returns -EMEDIUMTYPE if the device can't be made ready or 288 * -EAGAIN if do_analysis started a ccw that needs to complete 289 * before the analysis may be repeated. 290 */ 291 int (*do_analysis) (struct dasd_block *); 292 293 /* 294 * This function is called, when new paths become available. 295 * Disciplins may use this callback to do necessary setup work, 296 * e.g. verify that new path is compatible with the current 297 * configuration. 298 */ 299 int (*verify_path)(struct dasd_device *, __u8); 300 301 /* 302 * Last things to do when a device is set online, and first things 303 * when it is set offline. 304 */ 305 int (*basic_to_ready) (struct dasd_device *); 306 int (*online_to_ready) (struct dasd_device *); 307 int (*basic_to_known)(struct dasd_device *); 308 309 /* 310 * Initialize block layer request queue. 311 */ 312 void (*setup_blk_queue)(struct dasd_block *); 313 /* (struct dasd_device *); 314 * Device operation functions. build_cp creates a ccw chain for 315 * a block device request, start_io starts the request and 316 * term_IO cancels it (e.g. in case of a timeout). format_device 317 * formats the device and check_device_format compares the format of 318 * a device with the expected format_data. 319 * handle_terminated_request allows to examine a cqr and prepare 320 * it for retry. 321 */ 322 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 323 struct dasd_block *, 324 struct request *); 325 int (*start_IO) (struct dasd_ccw_req *); 326 int (*term_IO) (struct dasd_ccw_req *); 327 void (*handle_terminated_request) (struct dasd_ccw_req *); 328 int (*format_device) (struct dasd_device *, 329 struct format_data_t *, int); 330 int (*check_device_format)(struct dasd_device *, 331 struct format_check_t *, int); 332 int (*free_cp) (struct dasd_ccw_req *, struct request *); 333 334 /* 335 * Error recovery functions. examine_error() returns a value that 336 * indicates what to do for an error condition. If examine_error() 337 * returns 'dasd_era_recover' erp_action() is called to create a 338 * special error recovery ccw. erp_postaction() is called after 339 * an error recovery ccw has finished its execution. dump_sense 340 * is called for every error condition to print the sense data 341 * to the console. 342 */ 343 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 344 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 345 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 346 struct irb *); 347 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 348 void (*check_for_device_change) (struct dasd_device *, 349 struct dasd_ccw_req *, 350 struct irb *); 351 352 /* i/o control functions. */ 353 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 354 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 355 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 356 357 /* suspend/resume functions */ 358 int (*freeze) (struct dasd_device *); 359 int (*restore) (struct dasd_device *); 360 361 /* reload device after state change */ 362 int (*reload) (struct dasd_device *); 363 364 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 365 void (*kick_validate) (struct dasd_device *); 366 int (*check_attention)(struct dasd_device *, __u8); 367 int (*host_access_count)(struct dasd_device *); 368 int (*hosts_print)(struct dasd_device *, struct seq_file *); 369 void (*handle_hpf_error)(struct dasd_device *, struct irb *); 370 void (*disable_hpf)(struct dasd_device *); 371 int (*hpf_enabled)(struct dasd_device *); 372 void (*reset_path)(struct dasd_device *, __u8); 373 374 /* 375 * Extent Space Efficient (ESE) relevant functions 376 */ 377 int (*is_ese)(struct dasd_device *); 378 /* Capacity */ 379 int (*space_allocated)(struct dasd_device *); 380 int (*space_configured)(struct dasd_device *); 381 int (*logical_capacity)(struct dasd_device *); 382 int (*release_space)(struct dasd_device *, struct format_data_t *); 383 /* Extent Pool */ 384 int (*ext_pool_id)(struct dasd_device *); 385 int (*ext_size)(struct dasd_device *); 386 int (*ext_pool_cap_at_warnlevel)(struct dasd_device *); 387 int (*ext_pool_warn_thrshld)(struct dasd_device *); 388 int (*ext_pool_oos)(struct dasd_device *); 389 int (*ext_pool_exhaust)(struct dasd_device *, struct dasd_ccw_req *); 390 struct dasd_ccw_req *(*ese_format)(struct dasd_device *, struct dasd_ccw_req *); 391 void (*ese_read)(struct dasd_ccw_req *); 392 }; 393 394 extern struct dasd_discipline *dasd_diag_discipline_pointer; 395 396 /* 397 * Notification numbers for extended error reporting notifications: 398 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 399 * eer pointer) is freed. The error reporting module needs to do all necessary 400 * cleanup steps. 401 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 402 */ 403 #define DASD_EER_DISABLE 0 404 #define DASD_EER_TRIGGER 1 405 406 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 407 #define DASD_EER_FATALERROR 1 408 #define DASD_EER_NOPATH 2 409 #define DASD_EER_STATECHANGE 3 410 #define DASD_EER_PPRCSUSPEND 4 411 #define DASD_EER_NOSPC 5 412 413 /* DASD path handling */ 414 415 #define DASD_PATH_OPERATIONAL 1 416 #define DASD_PATH_TBV 2 417 #define DASD_PATH_PP 3 418 #define DASD_PATH_NPP 4 419 #define DASD_PATH_MISCABLED 5 420 #define DASD_PATH_NOHPF 6 421 #define DASD_PATH_CUIR 7 422 #define DASD_PATH_IFCC 8 423 424 #define DASD_THRHLD_MAX 4294967295U 425 #define DASD_INTERVAL_MAX 4294967295U 426 427 struct dasd_path { 428 unsigned long flags; 429 u8 cssid; 430 u8 ssid; 431 u8 chpid; 432 struct dasd_conf_data *conf_data; 433 atomic_t error_count; 434 unsigned long errorclk; 435 }; 436 437 438 struct dasd_profile_info { 439 /* legacy part of profile data, as in dasd_profile_info_t */ 440 unsigned int dasd_io_reqs; /* number of requests processed */ 441 unsigned int dasd_io_sects; /* number of sectors processed */ 442 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 443 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 444 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 445 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 446 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 447 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 448 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 449 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 450 451 /* new data */ 452 struct timespec64 starttod; /* time of start or last reset */ 453 unsigned int dasd_io_alias; /* requests using an alias */ 454 unsigned int dasd_io_tpm; /* requests using transport mode */ 455 unsigned int dasd_read_reqs; /* total number of read requests */ 456 unsigned int dasd_read_sects; /* total number read sectors */ 457 unsigned int dasd_read_alias; /* read request using an alias */ 458 unsigned int dasd_read_tpm; /* read requests in transport mode */ 459 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 460 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 461 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 462 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 463 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 464 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 465 unsigned long dasd_sum_times; /* sum of request times */ 466 unsigned long dasd_sum_time_str; /* sum of time from build to start */ 467 unsigned long dasd_sum_time_irq; /* sum of time from start to irq */ 468 unsigned long dasd_sum_time_end; /* sum of time from irq to end */ 469 }; 470 471 struct dasd_profile { 472 struct dentry *dentry; 473 struct dasd_profile_info *data; 474 spinlock_t lock; 475 }; 476 477 struct dasd_device { 478 /* Block device stuff. */ 479 struct dasd_block *block; 480 481 unsigned int devindex; 482 unsigned long flags; /* per device flags */ 483 unsigned short features; /* copy of devmap-features (read-only!) */ 484 485 /* extended error reporting stuff (eer) */ 486 struct dasd_ccw_req *eer_cqr; 487 488 /* Device discipline stuff. */ 489 struct dasd_discipline *discipline; 490 struct dasd_discipline *base_discipline; 491 void *private; 492 struct dasd_path path[8]; 493 __u8 opm; 494 495 /* Device state and target state. */ 496 int state, target; 497 struct mutex state_mutex; 498 int stopped; /* device (ccw_device_start) was stopped */ 499 500 /* reference count. */ 501 atomic_t ref_count; 502 503 /* ccw queue and memory for static ccw/erp buffers. */ 504 struct list_head ccw_queue; 505 spinlock_t mem_lock; 506 void *ccw_mem; 507 void *erp_mem; 508 void *ese_mem; 509 struct list_head ccw_chunks; 510 struct list_head erp_chunks; 511 struct list_head ese_chunks; 512 513 atomic_t tasklet_scheduled; 514 struct tasklet_struct tasklet; 515 struct work_struct kick_work; 516 struct work_struct restore_device; 517 struct work_struct reload_device; 518 struct work_struct kick_validate; 519 struct work_struct suc_work; 520 struct work_struct requeue_requests; 521 struct timer_list timer; 522 523 debug_info_t *debug_area; 524 525 struct ccw_device *cdev; 526 527 /* hook for alias management */ 528 struct list_head alias_list; 529 530 /* default expiration time in s */ 531 unsigned long default_expires; 532 unsigned long default_retries; 533 534 unsigned long blk_timeout; 535 536 unsigned long path_thrhld; 537 unsigned long path_interval; 538 539 struct dentry *debugfs_dentry; 540 struct dentry *hosts_dentry; 541 struct dasd_profile profile; 542 }; 543 544 struct dasd_block { 545 /* Block device stuff. */ 546 struct gendisk *gdp; 547 struct request_queue *request_queue; 548 spinlock_t request_queue_lock; 549 struct blk_mq_tag_set tag_set; 550 struct block_device *bdev; 551 atomic_t open_count; 552 553 unsigned long blocks; /* size of volume in blocks */ 554 unsigned int bp_block; /* bytes per block */ 555 unsigned int s2b_shift; /* log2 (bp_block/512) */ 556 557 struct dasd_device *base; 558 struct list_head ccw_queue; 559 spinlock_t queue_lock; 560 561 atomic_t tasklet_scheduled; 562 struct tasklet_struct tasklet; 563 struct timer_list timer; 564 565 struct dentry *debugfs_dentry; 566 struct dasd_profile profile; 567 }; 568 569 struct dasd_attention_data { 570 struct dasd_device *device; 571 __u8 lpum; 572 }; 573 574 struct dasd_queue { 575 spinlock_t lock; 576 }; 577 578 /* reasons why device (ccw_device_start) was stopped */ 579 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 580 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 581 #define DASD_STOPPED_PENDING 4 /* long busy */ 582 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 583 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 584 #define DASD_STOPPED_PM 32 /* pm state transition */ 585 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 586 #define DASD_STOPPED_NOSPC 128 /* no space left */ 587 588 /* per device flags */ 589 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 590 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 591 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 592 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 593 * confuse this with the user specified 594 * read-only feature. 595 */ 596 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 597 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 598 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 599 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ 600 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ 601 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ 602 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ 603 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */ 604 605 #define DASD_SLEEPON_START_TAG ((void *) 1) 606 #define DASD_SLEEPON_END_TAG ((void *) 2) 607 608 void dasd_put_device_wake(struct dasd_device *); 609 610 /* 611 * Reference count inliners 612 */ 613 static inline void 614 dasd_get_device(struct dasd_device *device) 615 { 616 atomic_inc(&device->ref_count); 617 } 618 619 static inline void 620 dasd_put_device(struct dasd_device *device) 621 { 622 if (atomic_dec_return(&device->ref_count) == 0) 623 dasd_put_device_wake(device); 624 } 625 626 /* 627 * The static memory in ccw_mem and erp_mem is managed by a sorted 628 * list of free memory chunks. 629 */ 630 struct dasd_mchunk 631 { 632 struct list_head list; 633 unsigned long size; 634 } __attribute__ ((aligned(8))); 635 636 static inline void 637 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 638 unsigned long size) 639 { 640 struct dasd_mchunk *chunk; 641 642 INIT_LIST_HEAD(chunk_list); 643 chunk = (struct dasd_mchunk *) mem; 644 chunk->size = size - sizeof(struct dasd_mchunk); 645 list_add(&chunk->list, chunk_list); 646 } 647 648 static inline void * 649 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 650 { 651 struct dasd_mchunk *chunk, *tmp; 652 653 size = (size + 7L) & -8L; 654 list_for_each_entry(chunk, chunk_list, list) { 655 if (chunk->size < size) 656 continue; 657 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 658 char *endaddr = (char *) (chunk + 1) + chunk->size; 659 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 660 tmp->size = size; 661 chunk->size -= size + sizeof(struct dasd_mchunk); 662 chunk = tmp; 663 } else 664 list_del(&chunk->list); 665 return (void *) (chunk + 1); 666 } 667 return NULL; 668 } 669 670 static inline void 671 dasd_free_chunk(struct list_head *chunk_list, void *mem) 672 { 673 struct dasd_mchunk *chunk, *tmp; 674 struct list_head *p, *left; 675 676 chunk = (struct dasd_mchunk *) 677 ((char *) mem - sizeof(struct dasd_mchunk)); 678 /* Find out the left neighbour in chunk_list. */ 679 left = chunk_list; 680 list_for_each(p, chunk_list) { 681 if (list_entry(p, struct dasd_mchunk, list) > chunk) 682 break; 683 left = p; 684 } 685 /* Try to merge with right neighbour = next element from left. */ 686 if (left->next != chunk_list) { 687 tmp = list_entry(left->next, struct dasd_mchunk, list); 688 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 689 list_del(&tmp->list); 690 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 691 } 692 } 693 /* Try to merge with left neighbour. */ 694 if (left != chunk_list) { 695 tmp = list_entry(left, struct dasd_mchunk, list); 696 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 697 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 698 return; 699 } 700 } 701 __list_add(&chunk->list, left, left->next); 702 } 703 704 /* 705 * Check if bsize is in { 512, 1024, 2048, 4096 } 706 */ 707 static inline int 708 dasd_check_blocksize(int bsize) 709 { 710 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 711 return -EMEDIUMTYPE; 712 return 0; 713 } 714 715 /* externals in dasd.c */ 716 #define DASD_PROFILE_OFF 0 717 #define DASD_PROFILE_ON 1 718 #define DASD_PROFILE_GLOBAL_ONLY 2 719 720 extern debug_info_t *dasd_debug_area; 721 extern struct dasd_profile dasd_global_profile; 722 extern unsigned int dasd_global_profile_level; 723 extern const struct block_device_operations dasd_device_operations; 724 725 extern struct kmem_cache *dasd_page_cache; 726 727 struct dasd_ccw_req * 728 dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *); 729 struct dasd_ccw_req *dasd_fmalloc_request(int, int, int, struct dasd_device *); 730 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 731 void dasd_ffree_request(struct dasd_ccw_req *, struct dasd_device *); 732 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 733 734 struct dasd_device *dasd_alloc_device(void); 735 void dasd_free_device(struct dasd_device *); 736 737 struct dasd_block *dasd_alloc_block(void); 738 void dasd_free_block(struct dasd_block *); 739 740 enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved); 741 742 void dasd_enable_device(struct dasd_device *); 743 void dasd_set_target_state(struct dasd_device *, int); 744 void dasd_kick_device(struct dasd_device *); 745 void dasd_restore_device(struct dasd_device *); 746 void dasd_reload_device(struct dasd_device *); 747 void dasd_schedule_requeue(struct dasd_device *); 748 749 void dasd_add_request_head(struct dasd_ccw_req *); 750 void dasd_add_request_tail(struct dasd_ccw_req *); 751 int dasd_start_IO(struct dasd_ccw_req *); 752 int dasd_term_IO(struct dasd_ccw_req *); 753 void dasd_schedule_device_bh(struct dasd_device *); 754 void dasd_schedule_block_bh(struct dasd_block *); 755 int dasd_sleep_on(struct dasd_ccw_req *); 756 int dasd_sleep_on_queue(struct list_head *); 757 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 758 int dasd_sleep_on_queue_interruptible(struct list_head *); 759 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 760 void dasd_device_set_timer(struct dasd_device *, int); 761 void dasd_device_clear_timer(struct dasd_device *); 762 void dasd_block_set_timer(struct dasd_block *, int); 763 void dasd_block_clear_timer(struct dasd_block *); 764 int dasd_cancel_req(struct dasd_ccw_req *); 765 int dasd_flush_device_queue(struct dasd_device *); 766 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 767 void dasd_generic_free_discipline(struct dasd_device *); 768 void dasd_generic_remove (struct ccw_device *cdev); 769 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 770 int dasd_generic_set_offline (struct ccw_device *cdev); 771 int dasd_generic_notify(struct ccw_device *, int); 772 int dasd_generic_last_path_gone(struct dasd_device *); 773 int dasd_generic_path_operational(struct dasd_device *); 774 void dasd_generic_shutdown(struct ccw_device *); 775 776 void dasd_generic_handle_state_change(struct dasd_device *); 777 int dasd_generic_pm_freeze(struct ccw_device *); 778 int dasd_generic_restore_device(struct ccw_device *); 779 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 780 void dasd_generic_path_event(struct ccw_device *, int *); 781 int dasd_generic_verify_path(struct dasd_device *, __u8); 782 void dasd_generic_space_exhaust(struct dasd_device *, struct dasd_ccw_req *); 783 void dasd_generic_space_avail(struct dasd_device *); 784 785 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 786 char *dasd_get_sense(struct irb *); 787 788 void dasd_device_set_stop_bits(struct dasd_device *, int); 789 void dasd_device_remove_stop_bits(struct dasd_device *, int); 790 791 int dasd_device_is_ro(struct dasd_device *); 792 793 void dasd_profile_reset(struct dasd_profile *); 794 int dasd_profile_on(struct dasd_profile *); 795 void dasd_profile_off(struct dasd_profile *); 796 char *dasd_get_user_string(const char __user *, size_t); 797 798 /* externals in dasd_devmap.c */ 799 extern int dasd_max_devindex; 800 extern int dasd_probeonly; 801 extern int dasd_autodetect; 802 extern int dasd_nopav; 803 extern int dasd_nofcx; 804 805 int dasd_devmap_init(void); 806 void dasd_devmap_exit(void); 807 808 struct dasd_device *dasd_create_device(struct ccw_device *); 809 void dasd_delete_device(struct dasd_device *); 810 811 int dasd_get_feature(struct ccw_device *, int); 812 int dasd_set_feature(struct ccw_device *, int, int); 813 814 int dasd_add_sysfs_files(struct ccw_device *); 815 void dasd_remove_sysfs_files(struct ccw_device *); 816 817 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 818 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 819 struct dasd_device *dasd_device_from_devindex(int); 820 821 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 822 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 823 824 int dasd_parse(void) __init; 825 int dasd_busid_known(const char *); 826 827 /* externals in dasd_gendisk.c */ 828 int dasd_gendisk_init(void); 829 void dasd_gendisk_exit(void); 830 int dasd_gendisk_alloc(struct dasd_block *); 831 void dasd_gendisk_free(struct dasd_block *); 832 int dasd_scan_partitions(struct dasd_block *); 833 void dasd_destroy_partitions(struct dasd_block *); 834 835 /* externals in dasd_ioctl.c */ 836 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 837 838 /* externals in dasd_proc.c */ 839 int dasd_proc_init(void); 840 void dasd_proc_exit(void); 841 842 /* externals in dasd_erp.c */ 843 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 844 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 845 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 846 struct dasd_device *); 847 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 848 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 849 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 850 851 /* externals in dasd_3990_erp.c */ 852 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 853 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 854 855 /* externals in dasd_eer.c */ 856 #ifdef CONFIG_DASD_EER 857 int dasd_eer_init(void); 858 void dasd_eer_exit(void); 859 int dasd_eer_enable(struct dasd_device *); 860 void dasd_eer_disable(struct dasd_device *); 861 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 862 unsigned int id); 863 void dasd_eer_snss(struct dasd_device *); 864 865 static inline int dasd_eer_enabled(struct dasd_device *device) 866 { 867 return device->eer_cqr != NULL; 868 } 869 #else 870 #define dasd_eer_init() (0) 871 #define dasd_eer_exit() do { } while (0) 872 #define dasd_eer_enable(d) (0) 873 #define dasd_eer_disable(d) do { } while (0) 874 #define dasd_eer_write(d,c,i) do { } while (0) 875 #define dasd_eer_snss(d) do { } while (0) 876 #define dasd_eer_enabled(d) (0) 877 #endif /* CONFIG_DASD_ERR */ 878 879 880 /* DASD path handling functions */ 881 882 /* 883 * helper functions to modify bit masks for a given channel path for a device 884 */ 885 static inline int dasd_path_is_operational(struct dasd_device *device, int chp) 886 { 887 return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 888 } 889 890 static inline int dasd_path_need_verify(struct dasd_device *device, int chp) 891 { 892 return test_bit(DASD_PATH_TBV, &device->path[chp].flags); 893 } 894 895 static inline void dasd_path_verify(struct dasd_device *device, int chp) 896 { 897 __set_bit(DASD_PATH_TBV, &device->path[chp].flags); 898 } 899 900 static inline void dasd_path_clear_verify(struct dasd_device *device, int chp) 901 { 902 __clear_bit(DASD_PATH_TBV, &device->path[chp].flags); 903 } 904 905 static inline void dasd_path_clear_all_verify(struct dasd_device *device) 906 { 907 int chp; 908 909 for (chp = 0; chp < 8; chp++) 910 dasd_path_clear_verify(device, chp); 911 } 912 913 static inline void dasd_path_operational(struct dasd_device *device, int chp) 914 { 915 __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 916 device->opm |= (0x80 >> chp); 917 } 918 919 static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp) 920 { 921 __set_bit(DASD_PATH_NPP, &device->path[chp].flags); 922 } 923 924 static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp) 925 { 926 return test_bit(DASD_PATH_NPP, &device->path[chp].flags); 927 } 928 929 static inline void dasd_path_clear_nonpreferred(struct dasd_device *device, 930 int chp) 931 { 932 __clear_bit(DASD_PATH_NPP, &device->path[chp].flags); 933 } 934 935 static inline void dasd_path_preferred(struct dasd_device *device, int chp) 936 { 937 __set_bit(DASD_PATH_PP, &device->path[chp].flags); 938 } 939 940 static inline int dasd_path_is_preferred(struct dasd_device *device, int chp) 941 { 942 return test_bit(DASD_PATH_PP, &device->path[chp].flags); 943 } 944 945 static inline void dasd_path_clear_preferred(struct dasd_device *device, 946 int chp) 947 { 948 __clear_bit(DASD_PATH_PP, &device->path[chp].flags); 949 } 950 951 static inline void dasd_path_clear_oper(struct dasd_device *device, int chp) 952 { 953 __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 954 device->opm &= ~(0x80 >> chp); 955 } 956 957 static inline void dasd_path_clear_cable(struct dasd_device *device, int chp) 958 { 959 __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 960 } 961 962 static inline void dasd_path_cuir(struct dasd_device *device, int chp) 963 { 964 __set_bit(DASD_PATH_CUIR, &device->path[chp].flags); 965 } 966 967 static inline int dasd_path_is_cuir(struct dasd_device *device, int chp) 968 { 969 return test_bit(DASD_PATH_CUIR, &device->path[chp].flags); 970 } 971 972 static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp) 973 { 974 __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags); 975 } 976 977 static inline void dasd_path_ifcc(struct dasd_device *device, int chp) 978 { 979 set_bit(DASD_PATH_IFCC, &device->path[chp].flags); 980 } 981 982 static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp) 983 { 984 return test_bit(DASD_PATH_IFCC, &device->path[chp].flags); 985 } 986 987 static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp) 988 { 989 clear_bit(DASD_PATH_IFCC, &device->path[chp].flags); 990 } 991 992 static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp) 993 { 994 __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 995 } 996 997 static inline void dasd_path_miscabled(struct dasd_device *device, int chp) 998 { 999 __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 1000 } 1001 1002 static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp) 1003 { 1004 return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 1005 } 1006 1007 static inline void dasd_path_nohpf(struct dasd_device *device, int chp) 1008 { 1009 __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 1010 } 1011 1012 static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp) 1013 { 1014 return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 1015 } 1016 1017 /* 1018 * get functions for path masks 1019 * will return a path masks for the given device 1020 */ 1021 1022 static inline __u8 dasd_path_get_opm(struct dasd_device *device) 1023 { 1024 return device->opm; 1025 } 1026 1027 static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device) 1028 { 1029 int chp; 1030 __u8 tbvpm = 0x00; 1031 1032 for (chp = 0; chp < 8; chp++) 1033 if (dasd_path_need_verify(device, chp)) 1034 tbvpm |= 0x80 >> chp; 1035 return tbvpm; 1036 } 1037 1038 static inline __u8 dasd_path_get_nppm(struct dasd_device *device) 1039 { 1040 int chp; 1041 __u8 npm = 0x00; 1042 1043 for (chp = 0; chp < 8; chp++) { 1044 if (dasd_path_is_nonpreferred(device, chp)) 1045 npm |= 0x80 >> chp; 1046 } 1047 return npm; 1048 } 1049 1050 static inline __u8 dasd_path_get_ppm(struct dasd_device *device) 1051 { 1052 int chp; 1053 __u8 ppm = 0x00; 1054 1055 for (chp = 0; chp < 8; chp++) 1056 if (dasd_path_is_preferred(device, chp)) 1057 ppm |= 0x80 >> chp; 1058 return ppm; 1059 } 1060 1061 static inline __u8 dasd_path_get_cablepm(struct dasd_device *device) 1062 { 1063 int chp; 1064 __u8 cablepm = 0x00; 1065 1066 for (chp = 0; chp < 8; chp++) 1067 if (dasd_path_is_miscabled(device, chp)) 1068 cablepm |= 0x80 >> chp; 1069 return cablepm; 1070 } 1071 1072 static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device) 1073 { 1074 int chp; 1075 __u8 cuirpm = 0x00; 1076 1077 for (chp = 0; chp < 8; chp++) 1078 if (dasd_path_is_cuir(device, chp)) 1079 cuirpm |= 0x80 >> chp; 1080 return cuirpm; 1081 } 1082 1083 static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device) 1084 { 1085 int chp; 1086 __u8 ifccpm = 0x00; 1087 1088 for (chp = 0; chp < 8; chp++) 1089 if (dasd_path_is_ifcc(device, chp)) 1090 ifccpm |= 0x80 >> chp; 1091 return ifccpm; 1092 } 1093 1094 static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device) 1095 { 1096 int chp; 1097 __u8 hpfpm = 0x00; 1098 1099 for (chp = 0; chp < 8; chp++) 1100 if (dasd_path_is_nohpf(device, chp)) 1101 hpfpm |= 0x80 >> chp; 1102 return hpfpm; 1103 } 1104 1105 /* 1106 * add functions for path masks 1107 * the existing path mask will be extended by the given path mask 1108 */ 1109 static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm) 1110 { 1111 int chp; 1112 1113 for (chp = 0; chp < 8; chp++) 1114 if (pm & (0x80 >> chp)) 1115 dasd_path_verify(device, chp); 1116 } 1117 1118 static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device) 1119 { 1120 int chp; 1121 __u8 nopm = 0x00; 1122 1123 for (chp = 0; chp < 8; chp++) 1124 if (dasd_path_is_nohpf(device, chp) || 1125 dasd_path_is_ifcc(device, chp) || 1126 dasd_path_is_cuir(device, chp) || 1127 dasd_path_is_miscabled(device, chp)) 1128 nopm |= 0x80 >> chp; 1129 return nopm; 1130 } 1131 1132 static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm) 1133 { 1134 int chp; 1135 1136 for (chp = 0; chp < 8; chp++) 1137 if (pm & (0x80 >> chp)) { 1138 dasd_path_operational(device, chp); 1139 /* 1140 * if the path is used 1141 * it should not be in one of the negative lists 1142 */ 1143 dasd_path_clear_nohpf(device, chp); 1144 dasd_path_clear_cuir(device, chp); 1145 dasd_path_clear_cable(device, chp); 1146 dasd_path_clear_ifcc(device, chp); 1147 } 1148 } 1149 1150 static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm) 1151 { 1152 int chp; 1153 1154 for (chp = 0; chp < 8; chp++) 1155 if (pm & (0x80 >> chp)) 1156 dasd_path_miscabled(device, chp); 1157 } 1158 1159 static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm) 1160 { 1161 int chp; 1162 1163 for (chp = 0; chp < 8; chp++) 1164 if (pm & (0x80 >> chp)) 1165 dasd_path_cuir(device, chp); 1166 } 1167 1168 static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm) 1169 { 1170 int chp; 1171 1172 for (chp = 0; chp < 8; chp++) 1173 if (pm & (0x80 >> chp)) 1174 dasd_path_ifcc(device, chp); 1175 } 1176 1177 static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm) 1178 { 1179 int chp; 1180 1181 for (chp = 0; chp < 8; chp++) 1182 if (pm & (0x80 >> chp)) 1183 dasd_path_nonpreferred(device, chp); 1184 } 1185 1186 static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm) 1187 { 1188 int chp; 1189 1190 for (chp = 0; chp < 8; chp++) 1191 if (pm & (0x80 >> chp)) 1192 dasd_path_nohpf(device, chp); 1193 } 1194 1195 static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm) 1196 { 1197 int chp; 1198 1199 for (chp = 0; chp < 8; chp++) 1200 if (pm & (0x80 >> chp)) 1201 dasd_path_preferred(device, chp); 1202 } 1203 1204 /* 1205 * set functions for path masks 1206 * the existing path mask will be replaced by the given path mask 1207 */ 1208 static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm) 1209 { 1210 int chp; 1211 1212 for (chp = 0; chp < 8; chp++) 1213 if (pm & (0x80 >> chp)) 1214 dasd_path_verify(device, chp); 1215 else 1216 dasd_path_clear_verify(device, chp); 1217 } 1218 1219 static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm) 1220 { 1221 int chp; 1222 1223 for (chp = 0; chp < 8; chp++) { 1224 dasd_path_clear_oper(device, chp); 1225 if (pm & (0x80 >> chp)) { 1226 dasd_path_operational(device, chp); 1227 /* 1228 * if the path is used 1229 * it should not be in one of the negative lists 1230 */ 1231 dasd_path_clear_nohpf(device, chp); 1232 dasd_path_clear_cuir(device, chp); 1233 dasd_path_clear_cable(device, chp); 1234 dasd_path_clear_ifcc(device, chp); 1235 } 1236 } 1237 } 1238 1239 /* 1240 * remove functions for path masks 1241 * the existing path mask will be cleared with the given path mask 1242 */ 1243 static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm) 1244 { 1245 int chp; 1246 1247 for (chp = 0; chp < 8; chp++) { 1248 if (pm & (0x80 >> chp)) 1249 dasd_path_clear_oper(device, chp); 1250 } 1251 } 1252 1253 /* 1254 * add the newly available path to the to be verified pm and remove it from 1255 * normal operation until it is verified 1256 */ 1257 static inline void dasd_path_available(struct dasd_device *device, int chp) 1258 { 1259 dasd_path_clear_oper(device, chp); 1260 dasd_path_verify(device, chp); 1261 } 1262 1263 static inline void dasd_path_notoper(struct dasd_device *device, int chp) 1264 { 1265 dasd_path_clear_oper(device, chp); 1266 dasd_path_clear_preferred(device, chp); 1267 dasd_path_clear_nonpreferred(device, chp); 1268 } 1269 1270 /* 1271 * remove all paths from normal operation 1272 */ 1273 static inline void dasd_path_no_path(struct dasd_device *device) 1274 { 1275 int chp; 1276 1277 for (chp = 0; chp < 8; chp++) 1278 dasd_path_notoper(device, chp); 1279 1280 dasd_path_clear_all_verify(device); 1281 } 1282 1283 /* end - path handling */ 1284 1285 #endif /* DASD_H */ 1286