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 int max_blocks; /* maximum number of blocks to be chained */ 272 273 struct list_head list; /* used for list of disciplines */ 274 275 /* 276 * Device recognition functions. check_device is used to verify 277 * the sense data and the information returned by read device 278 * characteristics. It returns 0 if the discipline can be used 279 * for the device in question. uncheck_device is called during 280 * device shutdown to deregister a device from its discipline. 281 */ 282 int (*check_device) (struct dasd_device *); 283 void (*uncheck_device) (struct dasd_device *); 284 285 /* 286 * do_analysis is used in the step from device state "basic" to 287 * state "accept". It returns 0 if the device can be made ready, 288 * it returns -EMEDIUMTYPE if the device can't be made ready or 289 * -EAGAIN if do_analysis started a ccw that needs to complete 290 * before the analysis may be repeated. 291 */ 292 int (*do_analysis) (struct dasd_block *); 293 294 /* 295 * This function is called, when new paths become available. 296 * Disciplins may use this callback to do necessary setup work, 297 * e.g. verify that new path is compatible with the current 298 * configuration. 299 */ 300 int (*verify_path)(struct dasd_device *, __u8); 301 302 /* 303 * Last things to do when a device is set online, and first things 304 * when it is set offline. 305 */ 306 int (*basic_to_ready) (struct dasd_device *); 307 int (*online_to_ready) (struct dasd_device *); 308 int (*basic_to_known)(struct dasd_device *); 309 310 /* (struct dasd_device *); 311 * Device operation functions. build_cp creates a ccw chain for 312 * a block device request, start_io starts the request and 313 * term_IO cancels it (e.g. in case of a timeout). format_device 314 * formats the device and check_device_format compares the format of 315 * a device with the expected format_data. 316 * handle_terminated_request allows to examine a cqr and prepare 317 * it for retry. 318 */ 319 struct dasd_ccw_req *(*build_cp) (struct dasd_device *, 320 struct dasd_block *, 321 struct request *); 322 int (*start_IO) (struct dasd_ccw_req *); 323 int (*term_IO) (struct dasd_ccw_req *); 324 void (*handle_terminated_request) (struct dasd_ccw_req *); 325 int (*format_device) (struct dasd_device *, 326 struct format_data_t *, int); 327 int (*check_device_format)(struct dasd_device *, 328 struct format_check_t *, int); 329 int (*free_cp) (struct dasd_ccw_req *, struct request *); 330 331 /* 332 * Error recovery functions. examine_error() returns a value that 333 * indicates what to do for an error condition. If examine_error() 334 * returns 'dasd_era_recover' erp_action() is called to create a 335 * special error recovery ccw. erp_postaction() is called after 336 * an error recovery ccw has finished its execution. dump_sense 337 * is called for every error condition to print the sense data 338 * to the console. 339 */ 340 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *); 341 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *); 342 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *, 343 struct irb *); 344 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *); 345 void (*check_for_device_change) (struct dasd_device *, 346 struct dasd_ccw_req *, 347 struct irb *); 348 349 /* i/o control functions. */ 350 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *); 351 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *); 352 int (*ioctl) (struct dasd_block *, unsigned int, void __user *); 353 354 /* suspend/resume functions */ 355 int (*freeze) (struct dasd_device *); 356 int (*restore) (struct dasd_device *); 357 358 /* reload device after state change */ 359 int (*reload) (struct dasd_device *); 360 361 int (*get_uid) (struct dasd_device *, struct dasd_uid *); 362 void (*kick_validate) (struct dasd_device *); 363 int (*check_attention)(struct dasd_device *, __u8); 364 int (*host_access_count)(struct dasd_device *); 365 int (*hosts_print)(struct dasd_device *, struct seq_file *); 366 void (*handle_hpf_error)(struct dasd_device *, struct irb *); 367 void (*disable_hpf)(struct dasd_device *); 368 int (*hpf_enabled)(struct dasd_device *); 369 void (*reset_path)(struct dasd_device *, __u8); 370 }; 371 372 extern struct dasd_discipline *dasd_diag_discipline_pointer; 373 374 /* 375 * Notification numbers for extended error reporting notifications: 376 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's 377 * eer pointer) is freed. The error reporting module needs to do all necessary 378 * cleanup steps. 379 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers). 380 */ 381 #define DASD_EER_DISABLE 0 382 #define DASD_EER_TRIGGER 1 383 384 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */ 385 #define DASD_EER_FATALERROR 1 386 #define DASD_EER_NOPATH 2 387 #define DASD_EER_STATECHANGE 3 388 #define DASD_EER_PPRCSUSPEND 4 389 390 /* DASD path handling */ 391 392 #define DASD_PATH_OPERATIONAL 1 393 #define DASD_PATH_TBV 2 394 #define DASD_PATH_PP 3 395 #define DASD_PATH_NPP 4 396 #define DASD_PATH_MISCABLED 5 397 #define DASD_PATH_NOHPF 6 398 #define DASD_PATH_CUIR 7 399 #define DASD_PATH_IFCC 8 400 401 #define DASD_THRHLD_MAX 4294967295U 402 #define DASD_INTERVAL_MAX 4294967295U 403 404 struct dasd_path { 405 unsigned long flags; 406 u8 cssid; 407 u8 ssid; 408 u8 chpid; 409 struct dasd_conf_data *conf_data; 410 atomic_t error_count; 411 unsigned long errorclk; 412 }; 413 414 415 struct dasd_profile_info { 416 /* legacy part of profile data, as in dasd_profile_info_t */ 417 unsigned int dasd_io_reqs; /* number of requests processed */ 418 unsigned int dasd_io_sects; /* number of sectors processed */ 419 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */ 420 unsigned int dasd_io_times[32]; /* histogram of requests's times */ 421 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */ 422 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */ 423 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */ 424 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */ 425 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */ 426 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */ 427 428 /* new data */ 429 struct timespec64 starttod; /* time of start or last reset */ 430 unsigned int dasd_io_alias; /* requests using an alias */ 431 unsigned int dasd_io_tpm; /* requests using transport mode */ 432 unsigned int dasd_read_reqs; /* total number of read requests */ 433 unsigned int dasd_read_sects; /* total number read sectors */ 434 unsigned int dasd_read_alias; /* read request using an alias */ 435 unsigned int dasd_read_tpm; /* read requests in transport mode */ 436 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */ 437 unsigned int dasd_read_times[32]; /* histogram of requests's times */ 438 unsigned int dasd_read_time1[32]; /* hist. time from build to start */ 439 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */ 440 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */ 441 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */ 442 unsigned long dasd_sum_times; /* sum of request times */ 443 unsigned long dasd_sum_time_str; /* sum of time from build to start */ 444 unsigned long dasd_sum_time_irq; /* sum of time from start to irq */ 445 unsigned long dasd_sum_time_end; /* sum of time from irq to end */ 446 }; 447 448 struct dasd_profile { 449 struct dentry *dentry; 450 struct dasd_profile_info *data; 451 spinlock_t lock; 452 }; 453 454 struct dasd_device { 455 /* Block device stuff. */ 456 struct dasd_block *block; 457 458 unsigned int devindex; 459 unsigned long flags; /* per device flags */ 460 unsigned short features; /* copy of devmap-features (read-only!) */ 461 462 /* extended error reporting stuff (eer) */ 463 struct dasd_ccw_req *eer_cqr; 464 465 /* Device discipline stuff. */ 466 struct dasd_discipline *discipline; 467 struct dasd_discipline *base_discipline; 468 void *private; 469 struct dasd_path path[8]; 470 __u8 opm; 471 472 /* Device state and target state. */ 473 int state, target; 474 struct mutex state_mutex; 475 int stopped; /* device (ccw_device_start) was stopped */ 476 477 /* reference count. */ 478 atomic_t ref_count; 479 480 /* ccw queue and memory for static ccw/erp buffers. */ 481 struct list_head ccw_queue; 482 spinlock_t mem_lock; 483 void *ccw_mem; 484 void *erp_mem; 485 struct list_head ccw_chunks; 486 struct list_head erp_chunks; 487 488 atomic_t tasklet_scheduled; 489 struct tasklet_struct tasklet; 490 struct work_struct kick_work; 491 struct work_struct restore_device; 492 struct work_struct reload_device; 493 struct work_struct kick_validate; 494 struct work_struct suc_work; 495 struct work_struct requeue_requests; 496 struct timer_list timer; 497 498 debug_info_t *debug_area; 499 500 struct ccw_device *cdev; 501 502 /* hook for alias management */ 503 struct list_head alias_list; 504 505 /* default expiration time in s */ 506 unsigned long default_expires; 507 unsigned long default_retries; 508 509 unsigned long blk_timeout; 510 511 unsigned long path_thrhld; 512 unsigned long path_interval; 513 514 struct dentry *debugfs_dentry; 515 struct dentry *hosts_dentry; 516 struct dasd_profile profile; 517 }; 518 519 struct dasd_block { 520 /* Block device stuff. */ 521 struct gendisk *gdp; 522 struct request_queue *request_queue; 523 spinlock_t request_queue_lock; 524 struct blk_mq_tag_set tag_set; 525 struct block_device *bdev; 526 atomic_t open_count; 527 528 unsigned long blocks; /* size of volume in blocks */ 529 unsigned int bp_block; /* bytes per block */ 530 unsigned int s2b_shift; /* log2 (bp_block/512) */ 531 532 struct dasd_device *base; 533 struct list_head ccw_queue; 534 spinlock_t queue_lock; 535 536 atomic_t tasklet_scheduled; 537 struct tasklet_struct tasklet; 538 struct timer_list timer; 539 540 struct dentry *debugfs_dentry; 541 struct dasd_profile profile; 542 }; 543 544 struct dasd_attention_data { 545 struct dasd_device *device; 546 __u8 lpum; 547 }; 548 549 struct dasd_queue { 550 spinlock_t lock; 551 }; 552 553 /* reasons why device (ccw_device_start) was stopped */ 554 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */ 555 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */ 556 #define DASD_STOPPED_PENDING 4 /* long busy */ 557 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */ 558 #define DASD_STOPPED_SU 16 /* summary unit check handling */ 559 #define DASD_STOPPED_PM 32 /* pm state transition */ 560 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */ 561 562 /* per device flags */ 563 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */ 564 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */ 565 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */ 566 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't 567 * confuse this with the user specified 568 * read-only feature. 569 */ 570 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */ 571 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */ 572 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */ 573 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/ 574 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */ 575 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */ 576 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */ 577 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */ 578 579 #define DASD_SLEEPON_START_TAG ((void *) 1) 580 #define DASD_SLEEPON_END_TAG ((void *) 2) 581 582 void dasd_put_device_wake(struct dasd_device *); 583 584 /* 585 * Reference count inliners 586 */ 587 static inline void dasd_get_device(struct dasd_device * device)588 dasd_get_device(struct dasd_device *device) 589 { 590 atomic_inc(&device->ref_count); 591 } 592 593 static inline void dasd_put_device(struct dasd_device * device)594 dasd_put_device(struct dasd_device *device) 595 { 596 if (atomic_dec_return(&device->ref_count) == 0) 597 dasd_put_device_wake(device); 598 } 599 600 /* 601 * The static memory in ccw_mem and erp_mem is managed by a sorted 602 * list of free memory chunks. 603 */ 604 struct dasd_mchunk 605 { 606 struct list_head list; 607 unsigned long size; 608 } __attribute__ ((aligned(8))); 609 610 static inline void dasd_init_chunklist(struct list_head * chunk_list,void * mem,unsigned long size)611 dasd_init_chunklist(struct list_head *chunk_list, void *mem, 612 unsigned long size) 613 { 614 struct dasd_mchunk *chunk; 615 616 INIT_LIST_HEAD(chunk_list); 617 chunk = (struct dasd_mchunk *) mem; 618 chunk->size = size - sizeof(struct dasd_mchunk); 619 list_add(&chunk->list, chunk_list); 620 } 621 622 static inline void * dasd_alloc_chunk(struct list_head * chunk_list,unsigned long size)623 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size) 624 { 625 struct dasd_mchunk *chunk, *tmp; 626 627 size = (size + 7L) & -8L; 628 list_for_each_entry(chunk, chunk_list, list) { 629 if (chunk->size < size) 630 continue; 631 if (chunk->size > size + sizeof(struct dasd_mchunk)) { 632 char *endaddr = (char *) (chunk + 1) + chunk->size; 633 tmp = (struct dasd_mchunk *) (endaddr - size) - 1; 634 tmp->size = size; 635 chunk->size -= size + sizeof(struct dasd_mchunk); 636 chunk = tmp; 637 } else 638 list_del(&chunk->list); 639 return (void *) (chunk + 1); 640 } 641 return NULL; 642 } 643 644 static inline void dasd_free_chunk(struct list_head * chunk_list,void * mem)645 dasd_free_chunk(struct list_head *chunk_list, void *mem) 646 { 647 struct dasd_mchunk *chunk, *tmp; 648 struct list_head *p, *left; 649 650 chunk = (struct dasd_mchunk *) 651 ((char *) mem - sizeof(struct dasd_mchunk)); 652 /* Find out the left neighbour in chunk_list. */ 653 left = chunk_list; 654 list_for_each(p, chunk_list) { 655 if (list_entry(p, struct dasd_mchunk, list) > chunk) 656 break; 657 left = p; 658 } 659 /* Try to merge with right neighbour = next element from left. */ 660 if (left->next != chunk_list) { 661 tmp = list_entry(left->next, struct dasd_mchunk, list); 662 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) { 663 list_del(&tmp->list); 664 chunk->size += tmp->size + sizeof(struct dasd_mchunk); 665 } 666 } 667 /* Try to merge with left neighbour. */ 668 if (left != chunk_list) { 669 tmp = list_entry(left, struct dasd_mchunk, list); 670 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) { 671 tmp->size += chunk->size + sizeof(struct dasd_mchunk); 672 return; 673 } 674 } 675 __list_add(&chunk->list, left, left->next); 676 } 677 678 /* 679 * Check if bsize is in { 512, 1024, 2048, 4096 } 680 */ 681 static inline int dasd_check_blocksize(int bsize)682 dasd_check_blocksize(int bsize) 683 { 684 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize)) 685 return -EMEDIUMTYPE; 686 return 0; 687 } 688 689 /* externals in dasd.c */ 690 #define DASD_PROFILE_OFF 0 691 #define DASD_PROFILE_ON 1 692 #define DASD_PROFILE_GLOBAL_ONLY 2 693 694 extern debug_info_t *dasd_debug_area; 695 extern struct dasd_profile dasd_global_profile; 696 extern unsigned int dasd_global_profile_level; 697 extern const struct block_device_operations dasd_device_operations; 698 699 extern struct kmem_cache *dasd_page_cache; 700 701 struct dasd_ccw_req * 702 dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *); 703 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *); 704 void dasd_wakeup_cb(struct dasd_ccw_req *, void *); 705 706 struct dasd_device *dasd_alloc_device(void); 707 void dasd_free_device(struct dasd_device *); 708 709 struct dasd_block *dasd_alloc_block(void); 710 void dasd_free_block(struct dasd_block *); 711 712 enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved); 713 714 void dasd_enable_device(struct dasd_device *); 715 void dasd_set_target_state(struct dasd_device *, int); 716 void dasd_kick_device(struct dasd_device *); 717 void dasd_restore_device(struct dasd_device *); 718 void dasd_reload_device(struct dasd_device *); 719 void dasd_schedule_requeue(struct dasd_device *); 720 721 void dasd_add_request_head(struct dasd_ccw_req *); 722 void dasd_add_request_tail(struct dasd_ccw_req *); 723 int dasd_start_IO(struct dasd_ccw_req *); 724 int dasd_term_IO(struct dasd_ccw_req *); 725 void dasd_schedule_device_bh(struct dasd_device *); 726 void dasd_schedule_block_bh(struct dasd_block *); 727 int dasd_sleep_on(struct dasd_ccw_req *); 728 int dasd_sleep_on_queue(struct list_head *); 729 int dasd_sleep_on_immediatly(struct dasd_ccw_req *); 730 int dasd_sleep_on_interruptible(struct dasd_ccw_req *); 731 void dasd_device_set_timer(struct dasd_device *, int); 732 void dasd_device_clear_timer(struct dasd_device *); 733 void dasd_block_set_timer(struct dasd_block *, int); 734 void dasd_block_clear_timer(struct dasd_block *); 735 int dasd_cancel_req(struct dasd_ccw_req *); 736 int dasd_flush_device_queue(struct dasd_device *); 737 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *); 738 void dasd_generic_free_discipline(struct dasd_device *); 739 void dasd_generic_remove (struct ccw_device *cdev); 740 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *); 741 int dasd_generic_set_offline (struct ccw_device *cdev); 742 int dasd_generic_notify(struct ccw_device *, int); 743 int dasd_generic_last_path_gone(struct dasd_device *); 744 int dasd_generic_path_operational(struct dasd_device *); 745 void dasd_generic_shutdown(struct ccw_device *); 746 747 void dasd_generic_handle_state_change(struct dasd_device *); 748 int dasd_generic_pm_freeze(struct ccw_device *); 749 int dasd_generic_restore_device(struct ccw_device *); 750 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *); 751 void dasd_generic_path_event(struct ccw_device *, int *); 752 int dasd_generic_verify_path(struct dasd_device *, __u8); 753 754 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int); 755 char *dasd_get_sense(struct irb *); 756 757 void dasd_device_set_stop_bits(struct dasd_device *, int); 758 void dasd_device_remove_stop_bits(struct dasd_device *, int); 759 760 int dasd_device_is_ro(struct dasd_device *); 761 762 void dasd_profile_reset(struct dasd_profile *); 763 int dasd_profile_on(struct dasd_profile *); 764 void dasd_profile_off(struct dasd_profile *); 765 char *dasd_get_user_string(const char __user *, size_t); 766 767 /* externals in dasd_devmap.c */ 768 extern int dasd_max_devindex; 769 extern int dasd_probeonly; 770 extern int dasd_autodetect; 771 extern int dasd_nopav; 772 extern int dasd_nofcx; 773 774 int dasd_devmap_init(void); 775 void dasd_devmap_exit(void); 776 777 struct dasd_device *dasd_create_device(struct ccw_device *); 778 void dasd_delete_device(struct dasd_device *); 779 780 int dasd_get_feature(struct ccw_device *, int); 781 int dasd_set_feature(struct ccw_device *, int, int); 782 783 int dasd_add_sysfs_files(struct ccw_device *); 784 void dasd_remove_sysfs_files(struct ccw_device *); 785 786 struct dasd_device *dasd_device_from_cdev(struct ccw_device *); 787 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *); 788 struct dasd_device *dasd_device_from_devindex(int); 789 790 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *); 791 struct dasd_device *dasd_device_from_gendisk(struct gendisk *); 792 793 int dasd_parse(void) __init; 794 int dasd_busid_known(const char *); 795 796 /* externals in dasd_gendisk.c */ 797 int dasd_gendisk_init(void); 798 void dasd_gendisk_exit(void); 799 int dasd_gendisk_alloc(struct dasd_block *); 800 void dasd_gendisk_free(struct dasd_block *); 801 int dasd_scan_partitions(struct dasd_block *); 802 void dasd_destroy_partitions(struct dasd_block *); 803 804 /* externals in dasd_ioctl.c */ 805 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long); 806 807 /* externals in dasd_proc.c */ 808 int dasd_proc_init(void); 809 void dasd_proc_exit(void); 810 811 /* externals in dasd_erp.c */ 812 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *); 813 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *); 814 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, 815 struct dasd_device *); 816 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *); 817 void dasd_log_sense(struct dasd_ccw_req *, struct irb *); 818 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb); 819 820 /* externals in dasd_3990_erp.c */ 821 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *); 822 void dasd_3990_erp_handle_sim(struct dasd_device *, char *); 823 824 /* externals in dasd_eer.c */ 825 #ifdef CONFIG_DASD_EER 826 int dasd_eer_init(void); 827 void dasd_eer_exit(void); 828 int dasd_eer_enable(struct dasd_device *); 829 void dasd_eer_disable(struct dasd_device *); 830 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr, 831 unsigned int id); 832 void dasd_eer_snss(struct dasd_device *); 833 dasd_eer_enabled(struct dasd_device * device)834 static inline int dasd_eer_enabled(struct dasd_device *device) 835 { 836 return device->eer_cqr != NULL; 837 } 838 #else 839 #define dasd_eer_init() (0) 840 #define dasd_eer_exit() do { } while (0) 841 #define dasd_eer_enable(d) (0) 842 #define dasd_eer_disable(d) do { } while (0) 843 #define dasd_eer_write(d,c,i) do { } while (0) 844 #define dasd_eer_snss(d) do { } while (0) 845 #define dasd_eer_enabled(d) (0) 846 #endif /* CONFIG_DASD_ERR */ 847 848 849 /* DASD path handling functions */ 850 851 /* 852 * helper functions to modify bit masks for a given channel path for a device 853 */ dasd_path_is_operational(struct dasd_device * device,int chp)854 static inline int dasd_path_is_operational(struct dasd_device *device, int chp) 855 { 856 return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 857 } 858 dasd_path_need_verify(struct dasd_device * device,int chp)859 static inline int dasd_path_need_verify(struct dasd_device *device, int chp) 860 { 861 return test_bit(DASD_PATH_TBV, &device->path[chp].flags); 862 } 863 dasd_path_verify(struct dasd_device * device,int chp)864 static inline void dasd_path_verify(struct dasd_device *device, int chp) 865 { 866 __set_bit(DASD_PATH_TBV, &device->path[chp].flags); 867 } 868 dasd_path_clear_verify(struct dasd_device * device,int chp)869 static inline void dasd_path_clear_verify(struct dasd_device *device, int chp) 870 { 871 __clear_bit(DASD_PATH_TBV, &device->path[chp].flags); 872 } 873 dasd_path_clear_all_verify(struct dasd_device * device)874 static inline void dasd_path_clear_all_verify(struct dasd_device *device) 875 { 876 int chp; 877 878 for (chp = 0; chp < 8; chp++) 879 dasd_path_clear_verify(device, chp); 880 } 881 dasd_path_operational(struct dasd_device * device,int chp)882 static inline void dasd_path_operational(struct dasd_device *device, int chp) 883 { 884 __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 885 device->opm |= (0x80 >> chp); 886 } 887 dasd_path_nonpreferred(struct dasd_device * device,int chp)888 static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp) 889 { 890 __set_bit(DASD_PATH_NPP, &device->path[chp].flags); 891 } 892 dasd_path_is_nonpreferred(struct dasd_device * device,int chp)893 static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp) 894 { 895 return test_bit(DASD_PATH_NPP, &device->path[chp].flags); 896 } 897 dasd_path_clear_nonpreferred(struct dasd_device * device,int chp)898 static inline void dasd_path_clear_nonpreferred(struct dasd_device *device, 899 int chp) 900 { 901 __clear_bit(DASD_PATH_NPP, &device->path[chp].flags); 902 } 903 dasd_path_preferred(struct dasd_device * device,int chp)904 static inline void dasd_path_preferred(struct dasd_device *device, int chp) 905 { 906 __set_bit(DASD_PATH_PP, &device->path[chp].flags); 907 } 908 dasd_path_is_preferred(struct dasd_device * device,int chp)909 static inline int dasd_path_is_preferred(struct dasd_device *device, int chp) 910 { 911 return test_bit(DASD_PATH_PP, &device->path[chp].flags); 912 } 913 dasd_path_clear_preferred(struct dasd_device * device,int chp)914 static inline void dasd_path_clear_preferred(struct dasd_device *device, 915 int chp) 916 { 917 __clear_bit(DASD_PATH_PP, &device->path[chp].flags); 918 } 919 dasd_path_clear_oper(struct dasd_device * device,int chp)920 static inline void dasd_path_clear_oper(struct dasd_device *device, int chp) 921 { 922 __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags); 923 device->opm &= ~(0x80 >> chp); 924 } 925 dasd_path_clear_cable(struct dasd_device * device,int chp)926 static inline void dasd_path_clear_cable(struct dasd_device *device, int chp) 927 { 928 __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 929 } 930 dasd_path_cuir(struct dasd_device * device,int chp)931 static inline void dasd_path_cuir(struct dasd_device *device, int chp) 932 { 933 __set_bit(DASD_PATH_CUIR, &device->path[chp].flags); 934 } 935 dasd_path_is_cuir(struct dasd_device * device,int chp)936 static inline int dasd_path_is_cuir(struct dasd_device *device, int chp) 937 { 938 return test_bit(DASD_PATH_CUIR, &device->path[chp].flags); 939 } 940 dasd_path_clear_cuir(struct dasd_device * device,int chp)941 static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp) 942 { 943 __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags); 944 } 945 dasd_path_ifcc(struct dasd_device * device,int chp)946 static inline void dasd_path_ifcc(struct dasd_device *device, int chp) 947 { 948 set_bit(DASD_PATH_IFCC, &device->path[chp].flags); 949 } 950 dasd_path_is_ifcc(struct dasd_device * device,int chp)951 static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp) 952 { 953 return test_bit(DASD_PATH_IFCC, &device->path[chp].flags); 954 } 955 dasd_path_clear_ifcc(struct dasd_device * device,int chp)956 static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp) 957 { 958 clear_bit(DASD_PATH_IFCC, &device->path[chp].flags); 959 } 960 dasd_path_clear_nohpf(struct dasd_device * device,int chp)961 static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp) 962 { 963 __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 964 } 965 dasd_path_miscabled(struct dasd_device * device,int chp)966 static inline void dasd_path_miscabled(struct dasd_device *device, int chp) 967 { 968 __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 969 } 970 dasd_path_is_miscabled(struct dasd_device * device,int chp)971 static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp) 972 { 973 return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags); 974 } 975 dasd_path_nohpf(struct dasd_device * device,int chp)976 static inline void dasd_path_nohpf(struct dasd_device *device, int chp) 977 { 978 __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 979 } 980 dasd_path_is_nohpf(struct dasd_device * device,int chp)981 static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp) 982 { 983 return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags); 984 } 985 986 /* 987 * get functions for path masks 988 * will return a path masks for the given device 989 */ 990 dasd_path_get_opm(struct dasd_device * device)991 static inline __u8 dasd_path_get_opm(struct dasd_device *device) 992 { 993 return device->opm; 994 } 995 dasd_path_get_tbvpm(struct dasd_device * device)996 static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device) 997 { 998 int chp; 999 __u8 tbvpm = 0x00; 1000 1001 for (chp = 0; chp < 8; chp++) 1002 if (dasd_path_need_verify(device, chp)) 1003 tbvpm |= 0x80 >> chp; 1004 return tbvpm; 1005 } 1006 dasd_path_get_nppm(struct dasd_device * device)1007 static inline __u8 dasd_path_get_nppm(struct dasd_device *device) 1008 { 1009 int chp; 1010 __u8 npm = 0x00; 1011 1012 for (chp = 0; chp < 8; chp++) { 1013 if (dasd_path_is_nonpreferred(device, chp)) 1014 npm |= 0x80 >> chp; 1015 } 1016 return npm; 1017 } 1018 dasd_path_get_ppm(struct dasd_device * device)1019 static inline __u8 dasd_path_get_ppm(struct dasd_device *device) 1020 { 1021 int chp; 1022 __u8 ppm = 0x00; 1023 1024 for (chp = 0; chp < 8; chp++) 1025 if (dasd_path_is_preferred(device, chp)) 1026 ppm |= 0x80 >> chp; 1027 return ppm; 1028 } 1029 dasd_path_get_cablepm(struct dasd_device * device)1030 static inline __u8 dasd_path_get_cablepm(struct dasd_device *device) 1031 { 1032 int chp; 1033 __u8 cablepm = 0x00; 1034 1035 for (chp = 0; chp < 8; chp++) 1036 if (dasd_path_is_miscabled(device, chp)) 1037 cablepm |= 0x80 >> chp; 1038 return cablepm; 1039 } 1040 dasd_path_get_cuirpm(struct dasd_device * device)1041 static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device) 1042 { 1043 int chp; 1044 __u8 cuirpm = 0x00; 1045 1046 for (chp = 0; chp < 8; chp++) 1047 if (dasd_path_is_cuir(device, chp)) 1048 cuirpm |= 0x80 >> chp; 1049 return cuirpm; 1050 } 1051 dasd_path_get_ifccpm(struct dasd_device * device)1052 static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device) 1053 { 1054 int chp; 1055 __u8 ifccpm = 0x00; 1056 1057 for (chp = 0; chp < 8; chp++) 1058 if (dasd_path_is_ifcc(device, chp)) 1059 ifccpm |= 0x80 >> chp; 1060 return ifccpm; 1061 } 1062 dasd_path_get_hpfpm(struct dasd_device * device)1063 static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device) 1064 { 1065 int chp; 1066 __u8 hpfpm = 0x00; 1067 1068 for (chp = 0; chp < 8; chp++) 1069 if (dasd_path_is_nohpf(device, chp)) 1070 hpfpm |= 0x80 >> chp; 1071 return hpfpm; 1072 } 1073 1074 /* 1075 * add functions for path masks 1076 * the existing path mask will be extended by the given path mask 1077 */ dasd_path_add_tbvpm(struct dasd_device * device,__u8 pm)1078 static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm) 1079 { 1080 int chp; 1081 1082 for (chp = 0; chp < 8; chp++) 1083 if (pm & (0x80 >> chp)) 1084 dasd_path_verify(device, chp); 1085 } 1086 dasd_path_get_notoperpm(struct dasd_device * device)1087 static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device) 1088 { 1089 int chp; 1090 __u8 nopm = 0x00; 1091 1092 for (chp = 0; chp < 8; chp++) 1093 if (dasd_path_is_nohpf(device, chp) || 1094 dasd_path_is_ifcc(device, chp) || 1095 dasd_path_is_cuir(device, chp) || 1096 dasd_path_is_miscabled(device, chp)) 1097 nopm |= 0x80 >> chp; 1098 return nopm; 1099 } 1100 dasd_path_add_opm(struct dasd_device * device,__u8 pm)1101 static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm) 1102 { 1103 int chp; 1104 1105 for (chp = 0; chp < 8; chp++) 1106 if (pm & (0x80 >> chp)) { 1107 dasd_path_operational(device, chp); 1108 /* 1109 * if the path is used 1110 * it should not be in one of the negative lists 1111 */ 1112 dasd_path_clear_nohpf(device, chp); 1113 dasd_path_clear_cuir(device, chp); 1114 dasd_path_clear_cable(device, chp); 1115 dasd_path_clear_ifcc(device, chp); 1116 } 1117 } 1118 dasd_path_add_cablepm(struct dasd_device * device,__u8 pm)1119 static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm) 1120 { 1121 int chp; 1122 1123 for (chp = 0; chp < 8; chp++) 1124 if (pm & (0x80 >> chp)) 1125 dasd_path_miscabled(device, chp); 1126 } 1127 dasd_path_add_cuirpm(struct dasd_device * device,__u8 pm)1128 static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm) 1129 { 1130 int chp; 1131 1132 for (chp = 0; chp < 8; chp++) 1133 if (pm & (0x80 >> chp)) 1134 dasd_path_cuir(device, chp); 1135 } 1136 dasd_path_add_ifccpm(struct dasd_device * device,__u8 pm)1137 static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm) 1138 { 1139 int chp; 1140 1141 for (chp = 0; chp < 8; chp++) 1142 if (pm & (0x80 >> chp)) 1143 dasd_path_ifcc(device, chp); 1144 } 1145 dasd_path_add_nppm(struct dasd_device * device,__u8 pm)1146 static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm) 1147 { 1148 int chp; 1149 1150 for (chp = 0; chp < 8; chp++) 1151 if (pm & (0x80 >> chp)) 1152 dasd_path_nonpreferred(device, chp); 1153 } 1154 dasd_path_add_nohpfpm(struct dasd_device * device,__u8 pm)1155 static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm) 1156 { 1157 int chp; 1158 1159 for (chp = 0; chp < 8; chp++) 1160 if (pm & (0x80 >> chp)) 1161 dasd_path_nohpf(device, chp); 1162 } 1163 dasd_path_add_ppm(struct dasd_device * device,__u8 pm)1164 static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm) 1165 { 1166 int chp; 1167 1168 for (chp = 0; chp < 8; chp++) 1169 if (pm & (0x80 >> chp)) 1170 dasd_path_preferred(device, chp); 1171 } 1172 1173 /* 1174 * set functions for path masks 1175 * the existing path mask will be replaced by the given path mask 1176 */ dasd_path_set_tbvpm(struct dasd_device * device,__u8 pm)1177 static inline void dasd_path_set_tbvpm(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_verify(device, chp); 1184 else 1185 dasd_path_clear_verify(device, chp); 1186 } 1187 dasd_path_set_opm(struct dasd_device * device,__u8 pm)1188 static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm) 1189 { 1190 int chp; 1191 1192 for (chp = 0; chp < 8; chp++) { 1193 dasd_path_clear_oper(device, chp); 1194 if (pm & (0x80 >> chp)) { 1195 dasd_path_operational(device, chp); 1196 /* 1197 * if the path is used 1198 * it should not be in one of the negative lists 1199 */ 1200 dasd_path_clear_nohpf(device, chp); 1201 dasd_path_clear_cuir(device, chp); 1202 dasd_path_clear_cable(device, chp); 1203 dasd_path_clear_ifcc(device, chp); 1204 } 1205 } 1206 } 1207 1208 /* 1209 * remove functions for path masks 1210 * the existing path mask will be cleared with the given path mask 1211 */ dasd_path_remove_opm(struct dasd_device * device,__u8 pm)1212 static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm) 1213 { 1214 int chp; 1215 1216 for (chp = 0; chp < 8; chp++) { 1217 if (pm & (0x80 >> chp)) 1218 dasd_path_clear_oper(device, chp); 1219 } 1220 } 1221 1222 /* 1223 * add the newly available path to the to be verified pm and remove it from 1224 * normal operation until it is verified 1225 */ dasd_path_available(struct dasd_device * device,int chp)1226 static inline void dasd_path_available(struct dasd_device *device, int chp) 1227 { 1228 dasd_path_clear_oper(device, chp); 1229 dasd_path_verify(device, chp); 1230 } 1231 dasd_path_notoper(struct dasd_device * device,int chp)1232 static inline void dasd_path_notoper(struct dasd_device *device, int chp) 1233 { 1234 dasd_path_clear_oper(device, chp); 1235 dasd_path_clear_preferred(device, chp); 1236 dasd_path_clear_nonpreferred(device, chp); 1237 } 1238 1239 /* 1240 * remove all paths from normal operation 1241 */ dasd_path_no_path(struct dasd_device * device)1242 static inline void dasd_path_no_path(struct dasd_device *device) 1243 { 1244 int chp; 1245 1246 for (chp = 0; chp < 8; chp++) 1247 dasd_path_notoper(device, chp); 1248 1249 dasd_path_clear_all_verify(device); 1250 } 1251 1252 /* end - path handling */ 1253 1254 #endif /* DASD_H */ 1255
