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_DEV_EXC(d_level, d_device, d_str, d_data...) \
100 do { \
101 debug_sprintf_exception(d_device->debug_area, \
102 d_level, \
103 d_str "\n", \
104 d_data); \
105 } while(0)
106
107 #define DBF_EVENT(d_level, d_str, d_data...)\
108 do { \
109 debug_sprintf_event(dasd_debug_area, \
110 d_level,\
111 d_str "\n", \
112 d_data); \
113 } while(0)
114
115 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \
116 do { \
117 struct ccw_dev_id __dev_id; \
118 ccw_device_get_id(d_cdev, &__dev_id); \
119 debug_sprintf_event(dasd_debug_area, \
120 d_level, \
121 "0.%x.%04x " d_str "\n", \
122 __dev_id.ssid, __dev_id.devno, d_data); \
123 } while (0)
124
125 #define DBF_EXC(d_level, d_str, d_data...)\
126 do { \
127 debug_sprintf_exception(dasd_debug_area, \
128 d_level,\
129 d_str "\n", \
130 d_data); \
131 } while(0)
132
133 /* limit size for an errorstring */
134 #define ERRORLENGTH 30
135
136 /* definition of dbf debug levels */
137 #define DBF_EMERG 0 /* system is unusable */
138 #define DBF_ALERT 1 /* action must be taken immediately */
139 #define DBF_CRIT 2 /* critical conditions */
140 #define DBF_ERR 3 /* error conditions */
141 #define DBF_WARNING 4 /* warning conditions */
142 #define DBF_NOTICE 5 /* normal but significant condition */
143 #define DBF_INFO 6 /* informational */
144 #define DBF_DEBUG 6 /* debug-level messages */
145
146 /* messages to be written via klogd and dbf */
147 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
148 do { \
149 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
150 dev_name(&d_device->cdev->dev), d_args); \
151 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
152 } while(0)
153
154 #define MESSAGE(d_loglevel,d_string,d_args...)\
155 do { \
156 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
157 DBF_EVENT(DBF_ALERT, d_string, d_args); \
158 } while(0)
159
160 /* messages to be written via klogd only */
161 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
162 do { \
163 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
164 dev_name(&d_device->cdev->dev), d_args); \
165 } while(0)
166
167 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
168 do { \
169 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
170 } while(0)
171
172 /* Macro to calculate number of blocks per page */
173 #define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize)
174
175 struct dasd_ccw_req {
176 unsigned int magic; /* Eye catcher */
177 struct list_head devlist; /* for dasd_device request queue */
178 struct list_head blocklist; /* for dasd_block request queue */
179
180 /* Where to execute what... */
181 struct dasd_block *block; /* the originating block device */
182 struct dasd_device *memdev; /* the device used to allocate this */
183 struct dasd_device *startdev; /* device the request is started on */
184 struct dasd_device *basedev; /* base device if no block->base */
185 void *cpaddr; /* address of ccw or tcw */
186 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
187 char status; /* status of this request */
188 short retries; /* A retry counter */
189 unsigned long flags; /* flags of this request */
190 struct dasd_queue *dq;
191
192 /* ... and how */
193 unsigned long starttime; /* jiffies time of request start */
194 unsigned long expires; /* expiration period in jiffies */
195 char lpm; /* logical path mask */
196 void *data; /* pointer to data area */
197
198 /* these are important for recovering erroneous requests */
199 int intrc; /* internal error, e.g. from start_IO */
200 struct irb irb; /* device status in case of an error */
201 struct dasd_ccw_req *refers; /* ERP-chain queueing. */
202 void *function; /* originating ERP action */
203
204 /* these are for statistics only */
205 unsigned long buildclk; /* TOD-clock of request generation */
206 unsigned long startclk; /* TOD-clock of request start */
207 unsigned long stopclk; /* TOD-clock of request interrupt */
208 unsigned long endclk; /* TOD-clock of request termination */
209
210 /* Callback that is called after reaching final status. */
211 void (*callback)(struct dasd_ccw_req *, void *data);
212 void *callback_data;
213 };
214
215 /*
216 * dasd_ccw_req -> status can be:
217 */
218 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
219 #define DASD_CQR_DONE 0x01 /* request is completed successfully */
220 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
221 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
222 #define DASD_CQR_FAILED 0x04 /* request is finally failed */
223 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
224
225 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
226 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
227 #define DASD_CQR_ERROR 0x82 /* request is completed with error */
228 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
229 #define DASD_CQR_CLEARED 0x84 /* request was cleared */
230 #define DASD_CQR_SUCCESS 0x85 /* request was successful */
231
232 /* default expiration time*/
233 #define DASD_EXPIRES 300
234 #define DASD_EXPIRES_MAX 40000000
235 #define DASD_RETRIES 256
236 #define DASD_RETRIES_MAX 32768
237
238 /* per dasd_ccw_req flags */
239 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
240 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
241 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */
242 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was
243 * stolen. Should not be combined with
244 * DASD_CQR_FLAGS_USE_ERP
245 */
246 /*
247 * The following flags are used to suppress output of certain errors.
248 */
249 #define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */
250 #define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/
251 #define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */
252 #define DASD_CQR_SUPPRESS_CR 7 /* Suppress 'Command Reject' error */
253
254 /*
255 * There is no reliable way to determine the number of available CPUs on
256 * LPAR but there is no big performance difference between 1 and the
257 * maximum CPU number.
258 * 64 is a good trade off performance wise.
259 */
260 #define DASD_NR_HW_QUEUES 64
261 #define DASD_MAX_LCU_DEV 256
262 #define DASD_REQ_PER_DEV 4
263
264 /* Signature for error recovery functions. */
265 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
266
267 /*
268 * A single CQR can only contain a maximum of 255 CCWs. It is limited by
269 * the locate record and locate record extended count value which can only hold
270 * 1 Byte max.
271 */
272 #define DASD_CQR_MAX_CCW 255
273
274 /*
275 * Unique identifier for dasd device.
276 */
277 #define UA_NOT_CONFIGURED 0x00
278 #define UA_BASE_DEVICE 0x01
279 #define UA_BASE_PAV_ALIAS 0x02
280 #define UA_HYPER_PAV_ALIAS 0x03
281
282 struct dasd_uid {
283 __u8 type;
284 char vendor[4];
285 char serial[15];
286 __u16 ssid;
287 __u8 real_unit_addr;
288 __u8 base_unit_addr;
289 char vduit[33];
290 };
291
292 /*
293 * the struct dasd_discipline is
294 * sth like a table of virtual functions, if you think of dasd_eckd
295 * inheriting dasd...
296 * no, currently we are not planning to reimplement the driver in C++
297 */
298 struct dasd_discipline {
299 struct module *owner;
300 char ebcname[8]; /* a name used for tagging and printks */
301 char name[8]; /* a name used for tagging and printks */
302 int max_blocks; /* maximum number of blocks to be chained */
303
304 struct list_head list; /* used for list of disciplines */
305
306 /*
307 * Device recognition functions. check_device is used to verify
308 * the sense data and the information returned by read device
309 * characteristics. It returns 0 if the discipline can be used
310 * for the device in question. uncheck_device is called during
311 * device shutdown to deregister a device from its discipline.
312 */
313 int (*check_device) (struct dasd_device *);
314 void (*uncheck_device) (struct dasd_device *);
315
316 /*
317 * do_analysis is used in the step from device state "basic" to
318 * state "accept". It returns 0 if the device can be made ready,
319 * it returns -EMEDIUMTYPE if the device can't be made ready or
320 * -EAGAIN if do_analysis started a ccw that needs to complete
321 * before the analysis may be repeated.
322 */
323 int (*do_analysis) (struct dasd_block *);
324
325 /*
326 * This function is called, when new paths become available.
327 * Disciplins may use this callback to do necessary setup work,
328 * e.g. verify that new path is compatible with the current
329 * configuration.
330 */
331 int (*verify_path)(struct dasd_device *, __u8);
332
333 /*
334 * Last things to do when a device is set online, and first things
335 * when it is set offline.
336 */
337 int (*basic_to_ready) (struct dasd_device *);
338 int (*online_to_ready) (struct dasd_device *);
339 int (*basic_to_known)(struct dasd_device *);
340
341 /* (struct dasd_device *);
342 * Device operation functions. build_cp creates a ccw chain for
343 * a block device request, start_io starts the request and
344 * term_IO cancels it (e.g. in case of a timeout). format_device
345 * formats the device and check_device_format compares the format of
346 * a device with the expected format_data.
347 * handle_terminated_request allows to examine a cqr and prepare
348 * it for retry.
349 */
350 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
351 struct dasd_block *,
352 struct request *);
353 int (*start_IO) (struct dasd_ccw_req *);
354 int (*term_IO) (struct dasd_ccw_req *);
355 void (*handle_terminated_request) (struct dasd_ccw_req *);
356 int (*format_device) (struct dasd_device *,
357 struct format_data_t *, int);
358 int (*check_device_format)(struct dasd_device *,
359 struct format_check_t *, int);
360 int (*free_cp) (struct dasd_ccw_req *, struct request *);
361
362 /*
363 * Error recovery functions. examine_error() returns a value that
364 * indicates what to do for an error condition. If examine_error()
365 * returns 'dasd_era_recover' erp_action() is called to create a
366 * special error recovery ccw. erp_postaction() is called after
367 * an error recovery ccw has finished its execution. dump_sense
368 * is called for every error condition to print the sense data
369 * to the console.
370 */
371 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
372 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
373 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
374 struct irb *);
375 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
376 void (*check_for_device_change) (struct dasd_device *,
377 struct dasd_ccw_req *,
378 struct irb *);
379
380 /* i/o control functions. */
381 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
382 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
383 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
384
385 /* suspend/resume functions */
386 int (*freeze) (struct dasd_device *);
387 int (*restore) (struct dasd_device *);
388
389 /* reload device after state change */
390 int (*reload) (struct dasd_device *);
391
392 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
393 void (*kick_validate) (struct dasd_device *);
394 int (*check_attention)(struct dasd_device *, __u8);
395 int (*host_access_count)(struct dasd_device *);
396 int (*hosts_print)(struct dasd_device *, struct seq_file *);
397 void (*handle_hpf_error)(struct dasd_device *, struct irb *);
398 void (*disable_hpf)(struct dasd_device *);
399 int (*hpf_enabled)(struct dasd_device *);
400 void (*reset_path)(struct dasd_device *, __u8);
401 };
402
403 extern struct dasd_discipline *dasd_diag_discipline_pointer;
404
405 /*
406 * Notification numbers for extended error reporting notifications:
407 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
408 * eer pointer) is freed. The error reporting module needs to do all necessary
409 * cleanup steps.
410 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
411 */
412 #define DASD_EER_DISABLE 0
413 #define DASD_EER_TRIGGER 1
414
415 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
416 #define DASD_EER_FATALERROR 1
417 #define DASD_EER_NOPATH 2
418 #define DASD_EER_STATECHANGE 3
419 #define DASD_EER_PPRCSUSPEND 4
420
421 /* DASD path handling */
422
423 #define DASD_PATH_OPERATIONAL 1
424 #define DASD_PATH_TBV 2
425 #define DASD_PATH_PP 3
426 #define DASD_PATH_NPP 4
427 #define DASD_PATH_MISCABLED 5
428 #define DASD_PATH_NOHPF 6
429 #define DASD_PATH_CUIR 7
430 #define DASD_PATH_IFCC 8
431
432 #define DASD_THRHLD_MAX 4294967295U
433 #define DASD_INTERVAL_MAX 4294967295U
434
435 struct dasd_path {
436 unsigned long flags;
437 u8 cssid;
438 u8 ssid;
439 u8 chpid;
440 struct dasd_conf_data *conf_data;
441 atomic_t error_count;
442 unsigned long errorclk;
443 };
444
445
446 struct dasd_profile_info {
447 /* legacy part of profile data, as in dasd_profile_info_t */
448 unsigned int dasd_io_reqs; /* number of requests processed */
449 unsigned int dasd_io_sects; /* number of sectors processed */
450 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
451 unsigned int dasd_io_times[32]; /* histogram of requests's times */
452 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */
453 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
454 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
455 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
456 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
457 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
458
459 /* new data */
460 struct timespec starttod; /* time of start or last reset */
461 unsigned int dasd_io_alias; /* requests using an alias */
462 unsigned int dasd_io_tpm; /* requests using transport mode */
463 unsigned int dasd_read_reqs; /* total number of read requests */
464 unsigned int dasd_read_sects; /* total number read sectors */
465 unsigned int dasd_read_alias; /* read request using an alias */
466 unsigned int dasd_read_tpm; /* read requests in transport mode */
467 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
468 unsigned int dasd_read_times[32]; /* histogram of requests's times */
469 unsigned int dasd_read_time1[32]; /* hist. time from build to start */
470 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
471 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
472 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
473 unsigned long dasd_sum_times; /* sum of request times */
474 unsigned long dasd_sum_time_str; /* sum of time from build to start */
475 unsigned long dasd_sum_time_irq; /* sum of time from start to irq */
476 unsigned long dasd_sum_time_end; /* sum of time from irq to end */
477 };
478
479 struct dasd_profile {
480 struct dentry *dentry;
481 struct dasd_profile_info *data;
482 spinlock_t lock;
483 };
484
485 struct dasd_device {
486 /* Block device stuff. */
487 struct dasd_block *block;
488
489 unsigned int devindex;
490 unsigned long flags; /* per device flags */
491 unsigned short features; /* copy of devmap-features (read-only!) */
492
493 /* extended error reporting stuff (eer) */
494 struct dasd_ccw_req *eer_cqr;
495
496 /* Device discipline stuff. */
497 struct dasd_discipline *discipline;
498 struct dasd_discipline *base_discipline;
499 void *private;
500 struct dasd_path path[8];
501 __u8 opm;
502
503 /* Device state and target state. */
504 int state, target;
505 struct mutex state_mutex;
506 int stopped; /* device (ccw_device_start) was stopped */
507
508 /* reference count. */
509 atomic_t ref_count;
510
511 /* ccw queue and memory for static ccw/erp buffers. */
512 struct list_head ccw_queue;
513 spinlock_t mem_lock;
514 void *ccw_mem;
515 void *erp_mem;
516 struct list_head ccw_chunks;
517 struct list_head erp_chunks;
518
519 atomic_t tasklet_scheduled;
520 struct tasklet_struct tasklet;
521 struct work_struct kick_work;
522 struct work_struct restore_device;
523 struct work_struct reload_device;
524 struct work_struct kick_validate;
525 struct work_struct suc_work;
526 struct work_struct requeue_requests;
527 struct timer_list timer;
528
529 debug_info_t *debug_area;
530
531 struct ccw_device *cdev;
532
533 /* hook for alias management */
534 struct list_head alias_list;
535
536 /* default expiration time in s */
537 unsigned long default_expires;
538 unsigned long default_retries;
539
540 unsigned long blk_timeout;
541
542 unsigned long path_thrhld;
543 unsigned long path_interval;
544
545 struct dentry *debugfs_dentry;
546 struct dentry *hosts_dentry;
547 struct dasd_profile profile;
548 };
549
550 struct dasd_block {
551 /* Block device stuff. */
552 struct gendisk *gdp;
553 struct request_queue *request_queue;
554 spinlock_t request_queue_lock;
555 struct blk_mq_tag_set tag_set;
556 struct block_device *bdev;
557 atomic_t open_count;
558
559 unsigned long blocks; /* size of volume in blocks */
560 unsigned int bp_block; /* bytes per block */
561 unsigned int s2b_shift; /* log2 (bp_block/512) */
562
563 struct dasd_device *base;
564 struct list_head ccw_queue;
565 spinlock_t queue_lock;
566
567 atomic_t tasklet_scheduled;
568 struct tasklet_struct tasklet;
569 struct timer_list timer;
570
571 struct dentry *debugfs_dentry;
572 struct dasd_profile profile;
573 };
574
575 struct dasd_attention_data {
576 struct dasd_device *device;
577 __u8 lpum;
578 };
579
580 struct dasd_queue {
581 spinlock_t lock;
582 };
583
584 /* reasons why device (ccw_device_start) was stopped */
585 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */
586 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */
587 #define DASD_STOPPED_PENDING 4 /* long busy */
588 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
589 #define DASD_STOPPED_SU 16 /* summary unit check handling */
590 #define DASD_STOPPED_PM 32 /* pm state transition */
591 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */
592
593 /* per device flags */
594 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
595 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
596 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
597 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
598 * confuse this with the user specified
599 * read-only feature.
600 */
601 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
602 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
603 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
604 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
605 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
606 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
607 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
608 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */
609
610 #define DASD_SLEEPON_START_TAG ((void *) 1)
611 #define DASD_SLEEPON_END_TAG ((void *) 2)
612
613 void dasd_put_device_wake(struct dasd_device *);
614
615 /*
616 * Reference count inliners
617 */
618 static inline void
dasd_get_device(struct dasd_device * device)619 dasd_get_device(struct dasd_device *device)
620 {
621 atomic_inc(&device->ref_count);
622 }
623
624 static inline void
dasd_put_device(struct dasd_device * device)625 dasd_put_device(struct dasd_device *device)
626 {
627 if (atomic_dec_return(&device->ref_count) == 0)
628 dasd_put_device_wake(device);
629 }
630
631 /*
632 * The static memory in ccw_mem and erp_mem is managed by a sorted
633 * list of free memory chunks.
634 */
635 struct dasd_mchunk
636 {
637 struct list_head list;
638 unsigned long size;
639 } __attribute__ ((aligned(8)));
640
641 static inline void
dasd_init_chunklist(struct list_head * chunk_list,void * mem,unsigned long size)642 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
643 unsigned long size)
644 {
645 struct dasd_mchunk *chunk;
646
647 INIT_LIST_HEAD(chunk_list);
648 chunk = (struct dasd_mchunk *) mem;
649 chunk->size = size - sizeof(struct dasd_mchunk);
650 list_add(&chunk->list, chunk_list);
651 }
652
653 static inline void *
dasd_alloc_chunk(struct list_head * chunk_list,unsigned long size)654 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
655 {
656 struct dasd_mchunk *chunk, *tmp;
657
658 size = (size + 7L) & -8L;
659 list_for_each_entry(chunk, chunk_list, list) {
660 if (chunk->size < size)
661 continue;
662 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
663 char *endaddr = (char *) (chunk + 1) + chunk->size;
664 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
665 tmp->size = size;
666 chunk->size -= size + sizeof(struct dasd_mchunk);
667 chunk = tmp;
668 } else
669 list_del(&chunk->list);
670 return (void *) (chunk + 1);
671 }
672 return NULL;
673 }
674
675 static inline void
dasd_free_chunk(struct list_head * chunk_list,void * mem)676 dasd_free_chunk(struct list_head *chunk_list, void *mem)
677 {
678 struct dasd_mchunk *chunk, *tmp;
679 struct list_head *p, *left;
680
681 chunk = (struct dasd_mchunk *)
682 ((char *) mem - sizeof(struct dasd_mchunk));
683 /* Find out the left neighbour in chunk_list. */
684 left = chunk_list;
685 list_for_each(p, chunk_list) {
686 if (list_entry(p, struct dasd_mchunk, list) > chunk)
687 break;
688 left = p;
689 }
690 /* Try to merge with right neighbour = next element from left. */
691 if (left->next != chunk_list) {
692 tmp = list_entry(left->next, struct dasd_mchunk, list);
693 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
694 list_del(&tmp->list);
695 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
696 }
697 }
698 /* Try to merge with left neighbour. */
699 if (left != chunk_list) {
700 tmp = list_entry(left, struct dasd_mchunk, list);
701 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
702 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
703 return;
704 }
705 }
706 __list_add(&chunk->list, left, left->next);
707 }
708
709 /*
710 * Check if bsize is in { 512, 1024, 2048, 4096 }
711 */
712 static inline int
dasd_check_blocksize(int bsize)713 dasd_check_blocksize(int bsize)
714 {
715 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
716 return -EMEDIUMTYPE;
717 return 0;
718 }
719
720 /* externals in dasd.c */
721 #define DASD_PROFILE_OFF 0
722 #define DASD_PROFILE_ON 1
723 #define DASD_PROFILE_GLOBAL_ONLY 2
724
725 extern debug_info_t *dasd_debug_area;
726 extern struct dasd_profile dasd_global_profile;
727 extern unsigned int dasd_global_profile_level;
728 extern const struct block_device_operations dasd_device_operations;
729
730 extern struct kmem_cache *dasd_page_cache;
731
732 struct dasd_ccw_req *
733 dasd_kmalloc_request(int , int, int, struct dasd_device *);
734 struct dasd_ccw_req *
735 dasd_smalloc_request(int , int, int, struct dasd_device *);
736 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
737 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
738 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
739
740 static inline int
dasd_kmalloc_set_cda(struct ccw1 * ccw,void * cda,struct dasd_device * device)741 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
742 {
743 return set_normalized_cda(ccw, cda);
744 }
745
746 struct dasd_device *dasd_alloc_device(void);
747 void dasd_free_device(struct dasd_device *);
748
749 struct dasd_block *dasd_alloc_block(void);
750 void dasd_free_block(struct dasd_block *);
751
752 enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved);
753
754 void dasd_enable_device(struct dasd_device *);
755 void dasd_set_target_state(struct dasd_device *, int);
756 void dasd_kick_device(struct dasd_device *);
757 void dasd_restore_device(struct dasd_device *);
758 void dasd_reload_device(struct dasd_device *);
759 void dasd_schedule_requeue(struct dasd_device *);
760
761 void dasd_add_request_head(struct dasd_ccw_req *);
762 void dasd_add_request_tail(struct dasd_ccw_req *);
763 int dasd_start_IO(struct dasd_ccw_req *);
764 int dasd_term_IO(struct dasd_ccw_req *);
765 void dasd_schedule_device_bh(struct dasd_device *);
766 void dasd_schedule_block_bh(struct dasd_block *);
767 int dasd_sleep_on(struct dasd_ccw_req *);
768 int dasd_sleep_on_queue(struct list_head *);
769 int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
770 int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
771 void dasd_device_set_timer(struct dasd_device *, int);
772 void dasd_device_clear_timer(struct dasd_device *);
773 void dasd_block_set_timer(struct dasd_block *, int);
774 void dasd_block_clear_timer(struct dasd_block *);
775 int dasd_cancel_req(struct dasd_ccw_req *);
776 int dasd_flush_device_queue(struct dasd_device *);
777 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
778 void dasd_generic_free_discipline(struct dasd_device *);
779 void dasd_generic_remove (struct ccw_device *cdev);
780 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
781 int dasd_generic_set_offline (struct ccw_device *cdev);
782 int dasd_generic_notify(struct ccw_device *, int);
783 int dasd_generic_last_path_gone(struct dasd_device *);
784 int dasd_generic_path_operational(struct dasd_device *);
785 void dasd_generic_shutdown(struct ccw_device *);
786
787 void dasd_generic_handle_state_change(struct dasd_device *);
788 int dasd_generic_pm_freeze(struct ccw_device *);
789 int dasd_generic_restore_device(struct ccw_device *);
790 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
791 void dasd_generic_path_event(struct ccw_device *, int *);
792 int dasd_generic_verify_path(struct dasd_device *, __u8);
793
794 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
795 char *dasd_get_sense(struct irb *);
796
797 void dasd_device_set_stop_bits(struct dasd_device *, int);
798 void dasd_device_remove_stop_bits(struct dasd_device *, int);
799
800 int dasd_device_is_ro(struct dasd_device *);
801
802 void dasd_profile_reset(struct dasd_profile *);
803 int dasd_profile_on(struct dasd_profile *);
804 void dasd_profile_off(struct dasd_profile *);
805 char *dasd_get_user_string(const char __user *, size_t);
806
807 /* externals in dasd_devmap.c */
808 extern int dasd_max_devindex;
809 extern int dasd_probeonly;
810 extern int dasd_autodetect;
811 extern int dasd_nopav;
812 extern int dasd_nofcx;
813
814 int dasd_devmap_init(void);
815 void dasd_devmap_exit(void);
816
817 struct dasd_device *dasd_create_device(struct ccw_device *);
818 void dasd_delete_device(struct dasd_device *);
819
820 int dasd_get_feature(struct ccw_device *, int);
821 int dasd_set_feature(struct ccw_device *, int, int);
822
823 int dasd_add_sysfs_files(struct ccw_device *);
824 void dasd_remove_sysfs_files(struct ccw_device *);
825
826 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
827 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
828 struct dasd_device *dasd_device_from_devindex(int);
829
830 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
831 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
832
833 int dasd_parse(void) __init;
834 int dasd_busid_known(const char *);
835
836 /* externals in dasd_gendisk.c */
837 int dasd_gendisk_init(void);
838 void dasd_gendisk_exit(void);
839 int dasd_gendisk_alloc(struct dasd_block *);
840 void dasd_gendisk_free(struct dasd_block *);
841 int dasd_scan_partitions(struct dasd_block *);
842 void dasd_destroy_partitions(struct dasd_block *);
843
844 /* externals in dasd_ioctl.c */
845 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
846
847 /* externals in dasd_proc.c */
848 int dasd_proc_init(void);
849 void dasd_proc_exit(void);
850
851 /* externals in dasd_erp.c */
852 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
853 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
854 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
855 struct dasd_device *);
856 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
857 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
858 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
859
860 /* externals in dasd_3990_erp.c */
861 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
862 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
863
864 /* externals in dasd_eer.c */
865 #ifdef CONFIG_DASD_EER
866 int dasd_eer_init(void);
867 void dasd_eer_exit(void);
868 int dasd_eer_enable(struct dasd_device *);
869 void dasd_eer_disable(struct dasd_device *);
870 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
871 unsigned int id);
872 void dasd_eer_snss(struct dasd_device *);
873
dasd_eer_enabled(struct dasd_device * device)874 static inline int dasd_eer_enabled(struct dasd_device *device)
875 {
876 return device->eer_cqr != NULL;
877 }
878 #else
879 #define dasd_eer_init() (0)
880 #define dasd_eer_exit() do { } while (0)
881 #define dasd_eer_enable(d) (0)
882 #define dasd_eer_disable(d) do { } while (0)
883 #define dasd_eer_write(d,c,i) do { } while (0)
884 #define dasd_eer_snss(d) do { } while (0)
885 #define dasd_eer_enabled(d) (0)
886 #endif /* CONFIG_DASD_ERR */
887
888
889 /* DASD path handling functions */
890
891 /*
892 * helper functions to modify bit masks for a given channel path for a device
893 */
dasd_path_is_operational(struct dasd_device * device,int chp)894 static inline int dasd_path_is_operational(struct dasd_device *device, int chp)
895 {
896 return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
897 }
898
dasd_path_need_verify(struct dasd_device * device,int chp)899 static inline int dasd_path_need_verify(struct dasd_device *device, int chp)
900 {
901 return test_bit(DASD_PATH_TBV, &device->path[chp].flags);
902 }
903
dasd_path_verify(struct dasd_device * device,int chp)904 static inline void dasd_path_verify(struct dasd_device *device, int chp)
905 {
906 __set_bit(DASD_PATH_TBV, &device->path[chp].flags);
907 }
908
dasd_path_clear_verify(struct dasd_device * device,int chp)909 static inline void dasd_path_clear_verify(struct dasd_device *device, int chp)
910 {
911 __clear_bit(DASD_PATH_TBV, &device->path[chp].flags);
912 }
913
dasd_path_clear_all_verify(struct dasd_device * device)914 static inline void dasd_path_clear_all_verify(struct dasd_device *device)
915 {
916 int chp;
917
918 for (chp = 0; chp < 8; chp++)
919 dasd_path_clear_verify(device, chp);
920 }
921
dasd_path_operational(struct dasd_device * device,int chp)922 static inline void dasd_path_operational(struct dasd_device *device, int chp)
923 {
924 __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
925 device->opm |= (0x80 >> chp);
926 }
927
dasd_path_nonpreferred(struct dasd_device * device,int chp)928 static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp)
929 {
930 __set_bit(DASD_PATH_NPP, &device->path[chp].flags);
931 }
932
dasd_path_is_nonpreferred(struct dasd_device * device,int chp)933 static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp)
934 {
935 return test_bit(DASD_PATH_NPP, &device->path[chp].flags);
936 }
937
dasd_path_clear_nonpreferred(struct dasd_device * device,int chp)938 static inline void dasd_path_clear_nonpreferred(struct dasd_device *device,
939 int chp)
940 {
941 __clear_bit(DASD_PATH_NPP, &device->path[chp].flags);
942 }
943
dasd_path_preferred(struct dasd_device * device,int chp)944 static inline void dasd_path_preferred(struct dasd_device *device, int chp)
945 {
946 __set_bit(DASD_PATH_PP, &device->path[chp].flags);
947 }
948
dasd_path_is_preferred(struct dasd_device * device,int chp)949 static inline int dasd_path_is_preferred(struct dasd_device *device, int chp)
950 {
951 return test_bit(DASD_PATH_PP, &device->path[chp].flags);
952 }
953
dasd_path_clear_preferred(struct dasd_device * device,int chp)954 static inline void dasd_path_clear_preferred(struct dasd_device *device,
955 int chp)
956 {
957 __clear_bit(DASD_PATH_PP, &device->path[chp].flags);
958 }
959
dasd_path_clear_oper(struct dasd_device * device,int chp)960 static inline void dasd_path_clear_oper(struct dasd_device *device, int chp)
961 {
962 __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
963 device->opm &= ~(0x80 >> chp);
964 }
965
dasd_path_clear_cable(struct dasd_device * device,int chp)966 static inline void dasd_path_clear_cable(struct dasd_device *device, int chp)
967 {
968 __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
969 }
970
dasd_path_cuir(struct dasd_device * device,int chp)971 static inline void dasd_path_cuir(struct dasd_device *device, int chp)
972 {
973 __set_bit(DASD_PATH_CUIR, &device->path[chp].flags);
974 }
975
dasd_path_is_cuir(struct dasd_device * device,int chp)976 static inline int dasd_path_is_cuir(struct dasd_device *device, int chp)
977 {
978 return test_bit(DASD_PATH_CUIR, &device->path[chp].flags);
979 }
980
dasd_path_clear_cuir(struct dasd_device * device,int chp)981 static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp)
982 {
983 __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags);
984 }
985
dasd_path_ifcc(struct dasd_device * device,int chp)986 static inline void dasd_path_ifcc(struct dasd_device *device, int chp)
987 {
988 set_bit(DASD_PATH_IFCC, &device->path[chp].flags);
989 }
990
dasd_path_is_ifcc(struct dasd_device * device,int chp)991 static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp)
992 {
993 return test_bit(DASD_PATH_IFCC, &device->path[chp].flags);
994 }
995
dasd_path_clear_ifcc(struct dasd_device * device,int chp)996 static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp)
997 {
998 clear_bit(DASD_PATH_IFCC, &device->path[chp].flags);
999 }
1000
dasd_path_clear_nohpf(struct dasd_device * device,int chp)1001 static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp)
1002 {
1003 __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1004 }
1005
dasd_path_miscabled(struct dasd_device * device,int chp)1006 static inline void dasd_path_miscabled(struct dasd_device *device, int chp)
1007 {
1008 __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1009 }
1010
dasd_path_is_miscabled(struct dasd_device * device,int chp)1011 static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp)
1012 {
1013 return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1014 }
1015
dasd_path_nohpf(struct dasd_device * device,int chp)1016 static inline void dasd_path_nohpf(struct dasd_device *device, int chp)
1017 {
1018 __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1019 }
1020
dasd_path_is_nohpf(struct dasd_device * device,int chp)1021 static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp)
1022 {
1023 return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1024 }
1025
1026 /*
1027 * get functions for path masks
1028 * will return a path masks for the given device
1029 */
1030
dasd_path_get_opm(struct dasd_device * device)1031 static inline __u8 dasd_path_get_opm(struct dasd_device *device)
1032 {
1033 return device->opm;
1034 }
1035
dasd_path_get_tbvpm(struct dasd_device * device)1036 static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device)
1037 {
1038 int chp;
1039 __u8 tbvpm = 0x00;
1040
1041 for (chp = 0; chp < 8; chp++)
1042 if (dasd_path_need_verify(device, chp))
1043 tbvpm |= 0x80 >> chp;
1044 return tbvpm;
1045 }
1046
dasd_path_get_nppm(struct dasd_device * device)1047 static inline __u8 dasd_path_get_nppm(struct dasd_device *device)
1048 {
1049 int chp;
1050 __u8 npm = 0x00;
1051
1052 for (chp = 0; chp < 8; chp++) {
1053 if (dasd_path_is_nonpreferred(device, chp))
1054 npm |= 0x80 >> chp;
1055 }
1056 return npm;
1057 }
1058
dasd_path_get_ppm(struct dasd_device * device)1059 static inline __u8 dasd_path_get_ppm(struct dasd_device *device)
1060 {
1061 int chp;
1062 __u8 ppm = 0x00;
1063
1064 for (chp = 0; chp < 8; chp++)
1065 if (dasd_path_is_preferred(device, chp))
1066 ppm |= 0x80 >> chp;
1067 return ppm;
1068 }
1069
dasd_path_get_cablepm(struct dasd_device * device)1070 static inline __u8 dasd_path_get_cablepm(struct dasd_device *device)
1071 {
1072 int chp;
1073 __u8 cablepm = 0x00;
1074
1075 for (chp = 0; chp < 8; chp++)
1076 if (dasd_path_is_miscabled(device, chp))
1077 cablepm |= 0x80 >> chp;
1078 return cablepm;
1079 }
1080
dasd_path_get_cuirpm(struct dasd_device * device)1081 static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device)
1082 {
1083 int chp;
1084 __u8 cuirpm = 0x00;
1085
1086 for (chp = 0; chp < 8; chp++)
1087 if (dasd_path_is_cuir(device, chp))
1088 cuirpm |= 0x80 >> chp;
1089 return cuirpm;
1090 }
1091
dasd_path_get_ifccpm(struct dasd_device * device)1092 static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device)
1093 {
1094 int chp;
1095 __u8 ifccpm = 0x00;
1096
1097 for (chp = 0; chp < 8; chp++)
1098 if (dasd_path_is_ifcc(device, chp))
1099 ifccpm |= 0x80 >> chp;
1100 return ifccpm;
1101 }
1102
dasd_path_get_hpfpm(struct dasd_device * device)1103 static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device)
1104 {
1105 int chp;
1106 __u8 hpfpm = 0x00;
1107
1108 for (chp = 0; chp < 8; chp++)
1109 if (dasd_path_is_nohpf(device, chp))
1110 hpfpm |= 0x80 >> chp;
1111 return hpfpm;
1112 }
1113
1114 /*
1115 * add functions for path masks
1116 * the existing path mask will be extended by the given path mask
1117 */
dasd_path_add_tbvpm(struct dasd_device * device,__u8 pm)1118 static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm)
1119 {
1120 int chp;
1121
1122 for (chp = 0; chp < 8; chp++)
1123 if (pm & (0x80 >> chp))
1124 dasd_path_verify(device, chp);
1125 }
1126
dasd_path_get_notoperpm(struct dasd_device * device)1127 static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device)
1128 {
1129 int chp;
1130 __u8 nopm = 0x00;
1131
1132 for (chp = 0; chp < 8; chp++)
1133 if (dasd_path_is_nohpf(device, chp) ||
1134 dasd_path_is_ifcc(device, chp) ||
1135 dasd_path_is_cuir(device, chp) ||
1136 dasd_path_is_miscabled(device, chp))
1137 nopm |= 0x80 >> chp;
1138 return nopm;
1139 }
1140
dasd_path_add_opm(struct dasd_device * device,__u8 pm)1141 static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm)
1142 {
1143 int chp;
1144
1145 for (chp = 0; chp < 8; chp++)
1146 if (pm & (0x80 >> chp)) {
1147 dasd_path_operational(device, chp);
1148 /*
1149 * if the path is used
1150 * it should not be in one of the negative lists
1151 */
1152 dasd_path_clear_nohpf(device, chp);
1153 dasd_path_clear_cuir(device, chp);
1154 dasd_path_clear_cable(device, chp);
1155 dasd_path_clear_ifcc(device, chp);
1156 }
1157 }
1158
dasd_path_add_cablepm(struct dasd_device * device,__u8 pm)1159 static inline void dasd_path_add_cablepm(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_miscabled(device, chp);
1166 }
1167
dasd_path_add_cuirpm(struct dasd_device * device,__u8 pm)1168 static inline void dasd_path_add_cuirpm(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_cuir(device, chp);
1175 }
1176
dasd_path_add_ifccpm(struct dasd_device * device,__u8 pm)1177 static inline void dasd_path_add_ifccpm(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_ifcc(device, chp);
1184 }
1185
dasd_path_add_nppm(struct dasd_device * device,__u8 pm)1186 static inline void dasd_path_add_nppm(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_nonpreferred(device, chp);
1193 }
1194
dasd_path_add_nohpfpm(struct dasd_device * device,__u8 pm)1195 static inline void dasd_path_add_nohpfpm(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_nohpf(device, chp);
1202 }
1203
dasd_path_add_ppm(struct dasd_device * device,__u8 pm)1204 static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm)
1205 {
1206 int chp;
1207
1208 for (chp = 0; chp < 8; chp++)
1209 if (pm & (0x80 >> chp))
1210 dasd_path_preferred(device, chp);
1211 }
1212
1213 /*
1214 * set functions for path masks
1215 * the existing path mask will be replaced by the given path mask
1216 */
dasd_path_set_tbvpm(struct dasd_device * device,__u8 pm)1217 static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm)
1218 {
1219 int chp;
1220
1221 for (chp = 0; chp < 8; chp++)
1222 if (pm & (0x80 >> chp))
1223 dasd_path_verify(device, chp);
1224 else
1225 dasd_path_clear_verify(device, chp);
1226 }
1227
dasd_path_set_opm(struct dasd_device * device,__u8 pm)1228 static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm)
1229 {
1230 int chp;
1231
1232 for (chp = 0; chp < 8; chp++) {
1233 dasd_path_clear_oper(device, chp);
1234 if (pm & (0x80 >> chp)) {
1235 dasd_path_operational(device, chp);
1236 /*
1237 * if the path is used
1238 * it should not be in one of the negative lists
1239 */
1240 dasd_path_clear_nohpf(device, chp);
1241 dasd_path_clear_cuir(device, chp);
1242 dasd_path_clear_cable(device, chp);
1243 dasd_path_clear_ifcc(device, chp);
1244 }
1245 }
1246 }
1247
1248 /*
1249 * remove functions for path masks
1250 * the existing path mask will be cleared with the given path mask
1251 */
dasd_path_remove_opm(struct dasd_device * device,__u8 pm)1252 static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm)
1253 {
1254 int chp;
1255
1256 for (chp = 0; chp < 8; chp++) {
1257 if (pm & (0x80 >> chp))
1258 dasd_path_clear_oper(device, chp);
1259 }
1260 }
1261
1262 /*
1263 * add the newly available path to the to be verified pm and remove it from
1264 * normal operation until it is verified
1265 */
dasd_path_available(struct dasd_device * device,int chp)1266 static inline void dasd_path_available(struct dasd_device *device, int chp)
1267 {
1268 dasd_path_clear_oper(device, chp);
1269 dasd_path_verify(device, chp);
1270 }
1271
dasd_path_notoper(struct dasd_device * device,int chp)1272 static inline void dasd_path_notoper(struct dasd_device *device, int chp)
1273 {
1274 dasd_path_clear_oper(device, chp);
1275 dasd_path_clear_preferred(device, chp);
1276 dasd_path_clear_nonpreferred(device, chp);
1277 }
1278
1279 /*
1280 * remove all paths from normal operation
1281 */
dasd_path_no_path(struct dasd_device * device)1282 static inline void dasd_path_no_path(struct dasd_device *device)
1283 {
1284 int chp;
1285
1286 for (chp = 0; chp < 8; chp++)
1287 dasd_path_notoper(device, chp);
1288
1289 dasd_path_clear_all_verify(device);
1290 }
1291
1292 /* end - path handling */
1293
1294 #endif /* DASD_H */
1295