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