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 unsigned int proc_bytes; /* bytes for partial completion */
191 };
192
193 /*
194 * dasd_ccw_req -> status can be:
195 */
196 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
197 #define DASD_CQR_DONE 0x01 /* request is completed successfully */
198 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
199 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
200 #define DASD_CQR_FAILED 0x04 /* request is finally failed */
201 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
202
203 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
204 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
205 #define DASD_CQR_ERROR 0x82 /* request is completed with error */
206 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
207 #define DASD_CQR_CLEARED 0x84 /* request was cleared */
208 #define DASD_CQR_SUCCESS 0x85 /* request was successful */
209
210 /* default expiration time*/
211 #define DASD_EXPIRES 300
212 #define DASD_EXPIRES_MAX 40000000
213 #define DASD_RETRIES 256
214 #define DASD_RETRIES_MAX 32768
215
216 /* per dasd_ccw_req flags */
217 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
218 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
219 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */
220 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was
221 * stolen. Should not be combined with
222 * DASD_CQR_FLAGS_USE_ERP
223 */
224 /*
225 * The following flags are used to suppress output of certain errors.
226 */
227 #define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */
228 #define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/
229 #define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */
230 #define DASD_CQR_SUPPRESS_CR 7 /* Suppress 'Command Reject' error */
231
232 #define DASD_REQ_PER_DEV 4
233
234 /* Signature for error recovery functions. */
235 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
236
237 /*
238 * A single CQR can only contain a maximum of 255 CCWs. It is limited by
239 * the locate record and locate record extended count value which can only hold
240 * 1 Byte max.
241 */
242 #define DASD_CQR_MAX_CCW 255
243
244 /*
245 * Unique identifier for dasd device.
246 */
247 #define UA_NOT_CONFIGURED 0x00
248 #define UA_BASE_DEVICE 0x01
249 #define UA_BASE_PAV_ALIAS 0x02
250 #define UA_HYPER_PAV_ALIAS 0x03
251
252 struct dasd_uid {
253 __u8 type;
254 char vendor[4];
255 char serial[15];
256 __u16 ssid;
257 __u8 real_unit_addr;
258 __u8 base_unit_addr;
259 char vduit[33];
260 };
261
262 /*
263 * the struct dasd_discipline is
264 * sth like a table of virtual functions, if you think of dasd_eckd
265 * inheriting dasd...
266 * no, currently we are not planning to reimplement the driver in C++
267 */
268 struct dasd_discipline {
269 struct module *owner;
270 char ebcname[8]; /* a name used for tagging and printks */
271 char name[8]; /* a name used for tagging and printks */
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 int (*pe_handler)(struct dasd_device *, __u8, __u8);
302
303 /*
304 * Last things to do when a device is set online, and first things
305 * when it is set offline.
306 */
307 int (*basic_to_ready) (struct dasd_device *);
308 int (*online_to_ready) (struct dasd_device *);
309 int (*basic_to_known)(struct dasd_device *);
310
311 /*
312 * Initialize block layer request queue.
313 */
314 void (*setup_blk_queue)(struct dasd_block *);
315 /* (struct dasd_device *);
316 * Device operation functions. build_cp creates a ccw chain for
317 * a block device request, start_io starts the request and
318 * term_IO cancels it (e.g. in case of a timeout). format_device
319 * formats the device and check_device_format compares the format of
320 * a device with the expected format_data.
321 * handle_terminated_request allows to examine a cqr and prepare
322 * it for retry.
323 */
324 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
325 struct dasd_block *,
326 struct request *);
327 int (*start_IO) (struct dasd_ccw_req *);
328 int (*term_IO) (struct dasd_ccw_req *);
329 void (*handle_terminated_request) (struct dasd_ccw_req *);
330 int (*format_device) (struct dasd_device *,
331 struct format_data_t *, int);
332 int (*check_device_format)(struct dasd_device *,
333 struct format_check_t *, int);
334 int (*free_cp) (struct dasd_ccw_req *, struct request *);
335
336 /*
337 * Error recovery functions. examine_error() returns a value that
338 * indicates what to do for an error condition. If examine_error()
339 * returns 'dasd_era_recover' erp_action() is called to create a
340 * special error recovery ccw. erp_postaction() is called after
341 * an error recovery ccw has finished its execution. dump_sense
342 * is called for every error condition to print the sense data
343 * to the console.
344 */
345 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
346 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
347 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
348 struct irb *);
349 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
350 void (*check_for_device_change) (struct dasd_device *,
351 struct dasd_ccw_req *,
352 struct irb *);
353
354 /* i/o control functions. */
355 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
356 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
357 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
358
359 /* reload device after state change */
360 int (*reload) (struct dasd_device *);
361
362 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
363 void (*kick_validate) (struct dasd_device *);
364 int (*check_attention)(struct dasd_device *, __u8);
365 int (*host_access_count)(struct dasd_device *);
366 int (*hosts_print)(struct dasd_device *, struct seq_file *);
367 void (*handle_hpf_error)(struct dasd_device *, struct irb *);
368 void (*disable_hpf)(struct dasd_device *);
369 int (*hpf_enabled)(struct dasd_device *);
370 void (*reset_path)(struct dasd_device *, __u8);
371
372 /*
373 * Extent Space Efficient (ESE) relevant functions
374 */
375 int (*is_ese)(struct dasd_device *);
376 /* Capacity */
377 int (*space_allocated)(struct dasd_device *);
378 int (*space_configured)(struct dasd_device *);
379 int (*logical_capacity)(struct dasd_device *);
380 int (*release_space)(struct dasd_device *, struct format_data_t *);
381 /* Extent Pool */
382 int (*ext_pool_id)(struct dasd_device *);
383 int (*ext_size)(struct dasd_device *);
384 int (*ext_pool_cap_at_warnlevel)(struct dasd_device *);
385 int (*ext_pool_warn_thrshld)(struct dasd_device *);
386 int (*ext_pool_oos)(struct dasd_device *);
387 int (*ext_pool_exhaust)(struct dasd_device *, struct dasd_ccw_req *);
388 struct dasd_ccw_req *(*ese_format)(struct dasd_device *,
389 struct dasd_ccw_req *, struct irb *);
390 int (*ese_read)(struct dasd_ccw_req *, struct irb *);
391 };
392
393 extern struct dasd_discipline *dasd_diag_discipline_pointer;
394
395 /*
396 * Notification numbers for extended error reporting notifications:
397 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
398 * eer pointer) is freed. The error reporting module needs to do all necessary
399 * cleanup steps.
400 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
401 */
402 #define DASD_EER_DISABLE 0
403 #define DASD_EER_TRIGGER 1
404
405 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
406 #define DASD_EER_FATALERROR 1
407 #define DASD_EER_NOPATH 2
408 #define DASD_EER_STATECHANGE 3
409 #define DASD_EER_PPRCSUSPEND 4
410 #define DASD_EER_NOSPC 5
411
412 /* DASD path handling */
413
414 #define DASD_PATH_OPERATIONAL 1
415 #define DASD_PATH_TBV 2
416 #define DASD_PATH_PP 3
417 #define DASD_PATH_NPP 4
418 #define DASD_PATH_MISCABLED 5
419 #define DASD_PATH_NOHPF 6
420 #define DASD_PATH_CUIR 7
421 #define DASD_PATH_IFCC 8
422 #define DASD_PATH_FCSEC 9
423
424 #define DASD_THRHLD_MAX 4294967295U
425 #define DASD_INTERVAL_MAX 4294967295U
426
427 /* FC Endpoint Security Capabilities */
428 #define DASD_FC_SECURITY_UNSUP 0
429 #define DASD_FC_SECURITY_AUTH 1
430 #define DASD_FC_SECURITY_ENC_FCSP2 2
431 #define DASD_FC_SECURITY_ENC_ERAS 3
432
433 #define DASD_FC_SECURITY_ENC_STR "Encryption"
434 static const struct {
435 u8 value;
436 char *name;
437 } dasd_path_fcs_mnemonics[] = {
438 { DASD_FC_SECURITY_UNSUP, "Unsupported" },
439 { DASD_FC_SECURITY_AUTH, "Authentication" },
440 { DASD_FC_SECURITY_ENC_FCSP2, DASD_FC_SECURITY_ENC_STR },
441 { DASD_FC_SECURITY_ENC_ERAS, DASD_FC_SECURITY_ENC_STR },
442 };
443
dasd_path_get_fcs_str(int val)444 static inline char *dasd_path_get_fcs_str(int val)
445 {
446 int i;
447
448 for (i = 0; i < ARRAY_SIZE(dasd_path_fcs_mnemonics); i++) {
449 if (dasd_path_fcs_mnemonics[i].value == val)
450 return dasd_path_fcs_mnemonics[i].name;
451 }
452
453 return dasd_path_fcs_mnemonics[0].name;
454 }
455
456 struct dasd_path {
457 unsigned long flags;
458 u8 cssid;
459 u8 ssid;
460 u8 chpid;
461 struct dasd_conf_data *conf_data;
462 atomic_t error_count;
463 unsigned long errorclk;
464 u8 fc_security;
465 struct kobject kobj;
466 bool in_sysfs;
467 };
468
469 #define to_dasd_path(path) container_of(path, struct dasd_path, kobj)
470
dasd_path_release(struct kobject * kobj)471 static inline void dasd_path_release(struct kobject *kobj)
472 {
473 /* Memory for the dasd_path kobject is freed when dasd_free_device() is called */
474 }
475
476
477 struct dasd_profile_info {
478 /* legacy part of profile data, as in dasd_profile_info_t */
479 unsigned int dasd_io_reqs; /* number of requests processed */
480 unsigned int dasd_io_sects; /* number of sectors processed */
481 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
482 unsigned int dasd_io_times[32]; /* histogram of requests's times */
483 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */
484 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
485 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
486 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
487 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
488 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
489
490 /* new data */
491 struct timespec64 starttod; /* time of start or last reset */
492 unsigned int dasd_io_alias; /* requests using an alias */
493 unsigned int dasd_io_tpm; /* requests using transport mode */
494 unsigned int dasd_read_reqs; /* total number of read requests */
495 unsigned int dasd_read_sects; /* total number read sectors */
496 unsigned int dasd_read_alias; /* read request using an alias */
497 unsigned int dasd_read_tpm; /* read requests in transport mode */
498 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
499 unsigned int dasd_read_times[32]; /* histogram of requests's times */
500 unsigned int dasd_read_time1[32]; /* hist. time from build to start */
501 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
502 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
503 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
504 unsigned long dasd_sum_times; /* sum of request times */
505 unsigned long dasd_sum_time_str; /* sum of time from build to start */
506 unsigned long dasd_sum_time_irq; /* sum of time from start to irq */
507 unsigned long dasd_sum_time_end; /* sum of time from irq to end */
508 };
509
510 struct dasd_profile {
511 struct dentry *dentry;
512 struct dasd_profile_info *data;
513 spinlock_t lock;
514 };
515
516 struct dasd_format_entry {
517 struct list_head list;
518 sector_t track;
519 };
520
521 struct dasd_device {
522 /* Block device stuff. */
523 struct dasd_block *block;
524
525 unsigned int devindex;
526 unsigned long flags; /* per device flags */
527 unsigned short features; /* copy of devmap-features (read-only!) */
528
529 /* extended error reporting stuff (eer) */
530 struct dasd_ccw_req *eer_cqr;
531
532 /* Device discipline stuff. */
533 struct dasd_discipline *discipline;
534 struct dasd_discipline *base_discipline;
535 void *private;
536 struct dasd_path path[8];
537 __u8 opm;
538
539 /* Device state and target state. */
540 int state, target;
541 struct mutex state_mutex;
542 int stopped; /* device (ccw_device_start) was stopped */
543
544 /* reference count. */
545 atomic_t ref_count;
546
547 /* ccw queue and memory for static ccw/erp buffers. */
548 struct list_head ccw_queue;
549 spinlock_t mem_lock;
550 void *ccw_mem;
551 void *erp_mem;
552 void *ese_mem;
553 struct list_head ccw_chunks;
554 struct list_head erp_chunks;
555 struct list_head ese_chunks;
556
557 atomic_t tasklet_scheduled;
558 struct tasklet_struct tasklet;
559 struct work_struct kick_work;
560 struct work_struct reload_device;
561 struct work_struct kick_validate;
562 struct work_struct suc_work;
563 struct work_struct requeue_requests;
564 struct timer_list timer;
565
566 debug_info_t *debug_area;
567
568 struct ccw_device *cdev;
569
570 /* hook for alias management */
571 struct list_head alias_list;
572
573 /* default expiration time in s */
574 unsigned long default_expires;
575 unsigned long default_retries;
576
577 unsigned long blk_timeout;
578
579 unsigned long path_thrhld;
580 unsigned long path_interval;
581
582 struct dentry *debugfs_dentry;
583 struct dentry *hosts_dentry;
584 struct dasd_profile profile;
585 struct dasd_format_entry format_entry;
586 struct kset *paths_info;
587 };
588
589 struct dasd_block {
590 /* Block device stuff. */
591 struct gendisk *gdp;
592 struct request_queue *request_queue;
593 spinlock_t request_queue_lock;
594 struct blk_mq_tag_set tag_set;
595 struct block_device *bdev;
596 atomic_t open_count;
597
598 unsigned long blocks; /* size of volume in blocks */
599 unsigned int bp_block; /* bytes per block */
600 unsigned int s2b_shift; /* log2 (bp_block/512) */
601
602 struct dasd_device *base;
603 struct list_head ccw_queue;
604 spinlock_t queue_lock;
605
606 atomic_t tasklet_scheduled;
607 struct tasklet_struct tasklet;
608 struct timer_list timer;
609
610 struct dentry *debugfs_dentry;
611 struct dasd_profile profile;
612
613 struct list_head format_list;
614 spinlock_t format_lock;
615 };
616
617 struct dasd_attention_data {
618 struct dasd_device *device;
619 __u8 lpum;
620 };
621
622 struct dasd_queue {
623 spinlock_t lock;
624 };
625
626 /* reasons why device (ccw_device_start) was stopped */
627 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */
628 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */
629 #define DASD_STOPPED_PENDING 4 /* long busy */
630 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
631 #define DASD_STOPPED_SU 16 /* summary unit check handling */
632 #define DASD_STOPPED_NOSPC 128 /* no space left */
633
634 /* per device flags */
635 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
636 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
637 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
638 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
639 * confuse this with the user specified
640 * read-only feature.
641 */
642 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
643 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
644 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
645 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
646 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
647 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
648 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
649 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */
650
651 #define DASD_SLEEPON_START_TAG ((void *) 1)
652 #define DASD_SLEEPON_END_TAG ((void *) 2)
653
654 void dasd_put_device_wake(struct dasd_device *);
655
656 /*
657 * Reference count inliners
658 */
659 static inline void
dasd_get_device(struct dasd_device * device)660 dasd_get_device(struct dasd_device *device)
661 {
662 atomic_inc(&device->ref_count);
663 }
664
665 static inline void
dasd_put_device(struct dasd_device * device)666 dasd_put_device(struct dasd_device *device)
667 {
668 if (atomic_dec_return(&device->ref_count) == 0)
669 dasd_put_device_wake(device);
670 }
671
672 /*
673 * The static memory in ccw_mem and erp_mem is managed by a sorted
674 * list of free memory chunks.
675 */
676 struct dasd_mchunk
677 {
678 struct list_head list;
679 unsigned long size;
680 } __attribute__ ((aligned(8)));
681
682 static inline void
dasd_init_chunklist(struct list_head * chunk_list,void * mem,unsigned long size)683 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
684 unsigned long size)
685 {
686 struct dasd_mchunk *chunk;
687
688 INIT_LIST_HEAD(chunk_list);
689 chunk = (struct dasd_mchunk *) mem;
690 chunk->size = size - sizeof(struct dasd_mchunk);
691 list_add(&chunk->list, chunk_list);
692 }
693
694 static inline void *
dasd_alloc_chunk(struct list_head * chunk_list,unsigned long size)695 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
696 {
697 struct dasd_mchunk *chunk, *tmp;
698
699 size = (size + 7L) & -8L;
700 list_for_each_entry(chunk, chunk_list, list) {
701 if (chunk->size < size)
702 continue;
703 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
704 char *endaddr = (char *) (chunk + 1) + chunk->size;
705 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
706 tmp->size = size;
707 chunk->size -= size + sizeof(struct dasd_mchunk);
708 chunk = tmp;
709 } else
710 list_del(&chunk->list);
711 return (void *) (chunk + 1);
712 }
713 return NULL;
714 }
715
716 static inline void
dasd_free_chunk(struct list_head * chunk_list,void * mem)717 dasd_free_chunk(struct list_head *chunk_list, void *mem)
718 {
719 struct dasd_mchunk *chunk, *tmp;
720 struct list_head *p, *left;
721
722 chunk = (struct dasd_mchunk *)
723 ((char *) mem - sizeof(struct dasd_mchunk));
724 /* Find out the left neighbour in chunk_list. */
725 left = chunk_list;
726 list_for_each(p, chunk_list) {
727 if (list_entry(p, struct dasd_mchunk, list) > chunk)
728 break;
729 left = p;
730 }
731 /* Try to merge with right neighbour = next element from left. */
732 if (left->next != chunk_list) {
733 tmp = list_entry(left->next, struct dasd_mchunk, list);
734 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
735 list_del(&tmp->list);
736 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
737 }
738 }
739 /* Try to merge with left neighbour. */
740 if (left != chunk_list) {
741 tmp = list_entry(left, struct dasd_mchunk, list);
742 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
743 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
744 return;
745 }
746 }
747 __list_add(&chunk->list, left, left->next);
748 }
749
750 /*
751 * Check if bsize is in { 512, 1024, 2048, 4096 }
752 */
753 static inline int
dasd_check_blocksize(int bsize)754 dasd_check_blocksize(int bsize)
755 {
756 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
757 return -EMEDIUMTYPE;
758 return 0;
759 }
760
761 /* externals in dasd.c */
762 #define DASD_PROFILE_OFF 0
763 #define DASD_PROFILE_ON 1
764 #define DASD_PROFILE_GLOBAL_ONLY 2
765
766 extern debug_info_t *dasd_debug_area;
767 extern struct dasd_profile dasd_global_profile;
768 extern unsigned int dasd_global_profile_level;
769 extern const struct block_device_operations dasd_device_operations;
770
771 extern struct kmem_cache *dasd_page_cache;
772
773 struct dasd_ccw_req *
774 dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *);
775 struct dasd_ccw_req *dasd_fmalloc_request(int, int, int, struct dasd_device *);
776 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
777 void dasd_ffree_request(struct dasd_ccw_req *, struct dasd_device *);
778 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
779
780 struct dasd_device *dasd_alloc_device(void);
781 void dasd_free_device(struct dasd_device *);
782
783 struct dasd_block *dasd_alloc_block(void);
784 void dasd_free_block(struct dasd_block *);
785
786 enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved);
787
788 void dasd_enable_device(struct dasd_device *);
789 void dasd_set_target_state(struct dasd_device *, int);
790 void dasd_kick_device(struct dasd_device *);
791 void dasd_reload_device(struct dasd_device *);
792 void dasd_schedule_requeue(struct dasd_device *);
793
794 void dasd_add_request_head(struct dasd_ccw_req *);
795 void dasd_add_request_tail(struct dasd_ccw_req *);
796 int dasd_start_IO(struct dasd_ccw_req *);
797 int dasd_term_IO(struct dasd_ccw_req *);
798 void dasd_schedule_device_bh(struct dasd_device *);
799 void dasd_schedule_block_bh(struct dasd_block *);
800 int dasd_sleep_on(struct dasd_ccw_req *);
801 int dasd_sleep_on_queue(struct list_head *);
802 int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
803 int dasd_sleep_on_queue_interruptible(struct list_head *);
804 int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
805 void dasd_device_set_timer(struct dasd_device *, int);
806 void dasd_device_clear_timer(struct dasd_device *);
807 void dasd_block_set_timer(struct dasd_block *, int);
808 void dasd_block_clear_timer(struct dasd_block *);
809 int dasd_cancel_req(struct dasd_ccw_req *);
810 int dasd_flush_device_queue(struct dasd_device *);
811 int dasd_generic_probe(struct ccw_device *);
812 void dasd_generic_free_discipline(struct dasd_device *);
813 void dasd_generic_remove (struct ccw_device *cdev);
814 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
815 int dasd_generic_set_offline (struct ccw_device *cdev);
816 int dasd_generic_notify(struct ccw_device *, int);
817 int dasd_generic_last_path_gone(struct dasd_device *);
818 int dasd_generic_path_operational(struct dasd_device *);
819 void dasd_generic_shutdown(struct ccw_device *);
820
821 void dasd_generic_handle_state_change(struct dasd_device *);
822 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
823 void dasd_generic_path_event(struct ccw_device *, int *);
824 int dasd_generic_verify_path(struct dasd_device *, __u8);
825 void dasd_generic_space_exhaust(struct dasd_device *, struct dasd_ccw_req *);
826 void dasd_generic_space_avail(struct dasd_device *);
827
828 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
829 char *dasd_get_sense(struct irb *);
830
831 void dasd_device_set_stop_bits(struct dasd_device *, int);
832 void dasd_device_remove_stop_bits(struct dasd_device *, int);
833
834 int dasd_device_is_ro(struct dasd_device *);
835
836 void dasd_profile_reset(struct dasd_profile *);
837 int dasd_profile_on(struct dasd_profile *);
838 void dasd_profile_off(struct dasd_profile *);
839 char *dasd_get_user_string(const char __user *, size_t);
840
841 /* externals in dasd_devmap.c */
842 extern int dasd_max_devindex;
843 extern int dasd_probeonly;
844 extern int dasd_autodetect;
845 extern int dasd_nopav;
846 extern int dasd_nofcx;
847
848 int dasd_devmap_init(void);
849 void dasd_devmap_exit(void);
850
851 struct dasd_device *dasd_create_device(struct ccw_device *);
852 void dasd_delete_device(struct dasd_device *);
853
854 int dasd_get_feature(struct ccw_device *, int);
855 int dasd_set_feature(struct ccw_device *, int, int);
856
857 extern const struct attribute_group *dasd_dev_groups[];
858 void dasd_path_create_kobj(struct dasd_device *, int);
859 void dasd_path_create_kobjects(struct dasd_device *);
860 void dasd_path_remove_kobjects(struct dasd_device *);
861
862 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
863 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
864 struct dasd_device *dasd_device_from_devindex(int);
865
866 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
867 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
868
869 int dasd_parse(void) __init;
870 int dasd_busid_known(const char *);
871
872 /* externals in dasd_gendisk.c */
873 int dasd_gendisk_init(void);
874 void dasd_gendisk_exit(void);
875 int dasd_gendisk_alloc(struct dasd_block *);
876 void dasd_gendisk_free(struct dasd_block *);
877 int dasd_scan_partitions(struct dasd_block *);
878 void dasd_destroy_partitions(struct dasd_block *);
879
880 /* externals in dasd_ioctl.c */
881 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
882 int dasd_set_read_only(struct block_device *bdev, bool ro);
883
884 /* externals in dasd_proc.c */
885 int dasd_proc_init(void);
886 void dasd_proc_exit(void);
887
888 /* externals in dasd_erp.c */
889 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
890 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
891 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
892 struct dasd_device *);
893 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
894 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
895 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
896
897 /* externals in dasd_3990_erp.c */
898 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
899 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
900
901 /* externals in dasd_eer.c */
902 #ifdef CONFIG_DASD_EER
903 int dasd_eer_init(void);
904 void dasd_eer_exit(void);
905 int dasd_eer_enable(struct dasd_device *);
906 void dasd_eer_disable(struct dasd_device *);
907 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
908 unsigned int id);
909 void dasd_eer_snss(struct dasd_device *);
910
dasd_eer_enabled(struct dasd_device * device)911 static inline int dasd_eer_enabled(struct dasd_device *device)
912 {
913 return device->eer_cqr != NULL;
914 }
915 #else
916 #define dasd_eer_init() (0)
917 #define dasd_eer_exit() do { } while (0)
918 #define dasd_eer_enable(d) (0)
919 #define dasd_eer_disable(d) do { } while (0)
920 #define dasd_eer_write(d,c,i) do { } while (0)
921 #define dasd_eer_snss(d) do { } while (0)
922 #define dasd_eer_enabled(d) (0)
923 #endif /* CONFIG_DASD_ERR */
924
925
926 /* DASD path handling functions */
927
928 /*
929 * helper functions to modify bit masks for a given channel path for a device
930 */
dasd_path_is_operational(struct dasd_device * device,int chp)931 static inline int dasd_path_is_operational(struct dasd_device *device, int chp)
932 {
933 return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
934 }
935
dasd_path_need_verify(struct dasd_device * device,int chp)936 static inline int dasd_path_need_verify(struct dasd_device *device, int chp)
937 {
938 return test_bit(DASD_PATH_TBV, &device->path[chp].flags);
939 }
940
dasd_path_verify(struct dasd_device * device,int chp)941 static inline void dasd_path_verify(struct dasd_device *device, int chp)
942 {
943 __set_bit(DASD_PATH_TBV, &device->path[chp].flags);
944 }
945
dasd_path_clear_verify(struct dasd_device * device,int chp)946 static inline void dasd_path_clear_verify(struct dasd_device *device, int chp)
947 {
948 __clear_bit(DASD_PATH_TBV, &device->path[chp].flags);
949 }
950
dasd_path_clear_all_verify(struct dasd_device * device)951 static inline void dasd_path_clear_all_verify(struct dasd_device *device)
952 {
953 int chp;
954
955 for (chp = 0; chp < 8; chp++)
956 dasd_path_clear_verify(device, chp);
957 }
958
dasd_path_fcsec(struct dasd_device * device,int chp)959 static inline void dasd_path_fcsec(struct dasd_device *device, int chp)
960 {
961 __set_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
962 }
963
dasd_path_clear_fcsec(struct dasd_device * device,int chp)964 static inline void dasd_path_clear_fcsec(struct dasd_device *device, int chp)
965 {
966 __clear_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
967 }
968
dasd_path_need_fcsec(struct dasd_device * device,int chp)969 static inline int dasd_path_need_fcsec(struct dasd_device *device, int chp)
970 {
971 return test_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
972 }
973
dasd_path_clear_all_fcsec(struct dasd_device * device)974 static inline void dasd_path_clear_all_fcsec(struct dasd_device *device)
975 {
976 int chp;
977
978 for (chp = 0; chp < 8; chp++)
979 dasd_path_clear_fcsec(device, chp);
980 }
981
dasd_path_operational(struct dasd_device * device,int chp)982 static inline void dasd_path_operational(struct dasd_device *device, int chp)
983 {
984 __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
985 device->opm |= (0x80 >> chp);
986 }
987
dasd_path_nonpreferred(struct dasd_device * device,int chp)988 static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp)
989 {
990 __set_bit(DASD_PATH_NPP, &device->path[chp].flags);
991 }
992
dasd_path_is_nonpreferred(struct dasd_device * device,int chp)993 static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp)
994 {
995 return test_bit(DASD_PATH_NPP, &device->path[chp].flags);
996 }
997
dasd_path_clear_nonpreferred(struct dasd_device * device,int chp)998 static inline void dasd_path_clear_nonpreferred(struct dasd_device *device,
999 int chp)
1000 {
1001 __clear_bit(DASD_PATH_NPP, &device->path[chp].flags);
1002 }
1003
dasd_path_preferred(struct dasd_device * device,int chp)1004 static inline void dasd_path_preferred(struct dasd_device *device, int chp)
1005 {
1006 __set_bit(DASD_PATH_PP, &device->path[chp].flags);
1007 }
1008
dasd_path_is_preferred(struct dasd_device * device,int chp)1009 static inline int dasd_path_is_preferred(struct dasd_device *device, int chp)
1010 {
1011 return test_bit(DASD_PATH_PP, &device->path[chp].flags);
1012 }
1013
dasd_path_clear_preferred(struct dasd_device * device,int chp)1014 static inline void dasd_path_clear_preferred(struct dasd_device *device,
1015 int chp)
1016 {
1017 __clear_bit(DASD_PATH_PP, &device->path[chp].flags);
1018 }
1019
dasd_path_clear_oper(struct dasd_device * device,int chp)1020 static inline void dasd_path_clear_oper(struct dasd_device *device, int chp)
1021 {
1022 __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
1023 device->opm &= ~(0x80 >> chp);
1024 }
1025
dasd_path_clear_cable(struct dasd_device * device,int chp)1026 static inline void dasd_path_clear_cable(struct dasd_device *device, int chp)
1027 {
1028 __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1029 }
1030
dasd_path_cuir(struct dasd_device * device,int chp)1031 static inline void dasd_path_cuir(struct dasd_device *device, int chp)
1032 {
1033 __set_bit(DASD_PATH_CUIR, &device->path[chp].flags);
1034 }
1035
dasd_path_is_cuir(struct dasd_device * device,int chp)1036 static inline int dasd_path_is_cuir(struct dasd_device *device, int chp)
1037 {
1038 return test_bit(DASD_PATH_CUIR, &device->path[chp].flags);
1039 }
1040
dasd_path_clear_cuir(struct dasd_device * device,int chp)1041 static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp)
1042 {
1043 __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags);
1044 }
1045
dasd_path_ifcc(struct dasd_device * device,int chp)1046 static inline void dasd_path_ifcc(struct dasd_device *device, int chp)
1047 {
1048 set_bit(DASD_PATH_IFCC, &device->path[chp].flags);
1049 }
1050
dasd_path_is_ifcc(struct dasd_device * device,int chp)1051 static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp)
1052 {
1053 return test_bit(DASD_PATH_IFCC, &device->path[chp].flags);
1054 }
1055
dasd_path_clear_ifcc(struct dasd_device * device,int chp)1056 static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp)
1057 {
1058 clear_bit(DASD_PATH_IFCC, &device->path[chp].flags);
1059 }
1060
dasd_path_clear_nohpf(struct dasd_device * device,int chp)1061 static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp)
1062 {
1063 __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1064 }
1065
dasd_path_miscabled(struct dasd_device * device,int chp)1066 static inline void dasd_path_miscabled(struct dasd_device *device, int chp)
1067 {
1068 __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1069 }
1070
dasd_path_is_miscabled(struct dasd_device * device,int chp)1071 static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp)
1072 {
1073 return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1074 }
1075
dasd_path_nohpf(struct dasd_device * device,int chp)1076 static inline void dasd_path_nohpf(struct dasd_device *device, int chp)
1077 {
1078 __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1079 }
1080
dasd_path_is_nohpf(struct dasd_device * device,int chp)1081 static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp)
1082 {
1083 return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1084 }
1085
1086 /*
1087 * get functions for path masks
1088 * will return a path masks for the given device
1089 */
1090
dasd_path_get_opm(struct dasd_device * device)1091 static inline __u8 dasd_path_get_opm(struct dasd_device *device)
1092 {
1093 return device->opm;
1094 }
1095
dasd_path_get_tbvpm(struct dasd_device * device)1096 static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device)
1097 {
1098 int chp;
1099 __u8 tbvpm = 0x00;
1100
1101 for (chp = 0; chp < 8; chp++)
1102 if (dasd_path_need_verify(device, chp))
1103 tbvpm |= 0x80 >> chp;
1104 return tbvpm;
1105 }
1106
dasd_path_get_fcsecpm(struct dasd_device * device)1107 static inline int dasd_path_get_fcsecpm(struct dasd_device *device)
1108 {
1109 int chp;
1110
1111 for (chp = 0; chp < 8; chp++)
1112 if (dasd_path_need_fcsec(device, chp))
1113 return 1;
1114
1115 return 0;
1116 }
1117
dasd_path_get_nppm(struct dasd_device * device)1118 static inline __u8 dasd_path_get_nppm(struct dasd_device *device)
1119 {
1120 int chp;
1121 __u8 npm = 0x00;
1122
1123 for (chp = 0; chp < 8; chp++) {
1124 if (dasd_path_is_nonpreferred(device, chp))
1125 npm |= 0x80 >> chp;
1126 }
1127 return npm;
1128 }
1129
dasd_path_get_ppm(struct dasd_device * device)1130 static inline __u8 dasd_path_get_ppm(struct dasd_device *device)
1131 {
1132 int chp;
1133 __u8 ppm = 0x00;
1134
1135 for (chp = 0; chp < 8; chp++)
1136 if (dasd_path_is_preferred(device, chp))
1137 ppm |= 0x80 >> chp;
1138 return ppm;
1139 }
1140
dasd_path_get_cablepm(struct dasd_device * device)1141 static inline __u8 dasd_path_get_cablepm(struct dasd_device *device)
1142 {
1143 int chp;
1144 __u8 cablepm = 0x00;
1145
1146 for (chp = 0; chp < 8; chp++)
1147 if (dasd_path_is_miscabled(device, chp))
1148 cablepm |= 0x80 >> chp;
1149 return cablepm;
1150 }
1151
dasd_path_get_cuirpm(struct dasd_device * device)1152 static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device)
1153 {
1154 int chp;
1155 __u8 cuirpm = 0x00;
1156
1157 for (chp = 0; chp < 8; chp++)
1158 if (dasd_path_is_cuir(device, chp))
1159 cuirpm |= 0x80 >> chp;
1160 return cuirpm;
1161 }
1162
dasd_path_get_ifccpm(struct dasd_device * device)1163 static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device)
1164 {
1165 int chp;
1166 __u8 ifccpm = 0x00;
1167
1168 for (chp = 0; chp < 8; chp++)
1169 if (dasd_path_is_ifcc(device, chp))
1170 ifccpm |= 0x80 >> chp;
1171 return ifccpm;
1172 }
1173
dasd_path_get_hpfpm(struct dasd_device * device)1174 static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device)
1175 {
1176 int chp;
1177 __u8 hpfpm = 0x00;
1178
1179 for (chp = 0; chp < 8; chp++)
1180 if (dasd_path_is_nohpf(device, chp))
1181 hpfpm |= 0x80 >> chp;
1182 return hpfpm;
1183 }
1184
dasd_path_get_fcs_path(struct dasd_device * device,int chp)1185 static inline u8 dasd_path_get_fcs_path(struct dasd_device *device, int chp)
1186 {
1187 return device->path[chp].fc_security;
1188 }
1189
dasd_path_get_fcs_device(struct dasd_device * device)1190 static inline int dasd_path_get_fcs_device(struct dasd_device *device)
1191 {
1192 u8 fc_sec = 0;
1193 int chp;
1194
1195 for (chp = 0; chp < 8; chp++) {
1196 if (device->opm & (0x80 >> chp)) {
1197 fc_sec = device->path[chp].fc_security;
1198 break;
1199 }
1200 }
1201 for (; chp < 8; chp++) {
1202 if (device->opm & (0x80 >> chp))
1203 if (device->path[chp].fc_security != fc_sec)
1204 return -EINVAL;
1205 }
1206
1207 return fc_sec;
1208 }
1209
1210 /*
1211 * add functions for path masks
1212 * the existing path mask will be extended by the given path mask
1213 */
dasd_path_add_tbvpm(struct dasd_device * device,__u8 pm)1214 static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm)
1215 {
1216 int chp;
1217
1218 for (chp = 0; chp < 8; chp++)
1219 if (pm & (0x80 >> chp))
1220 dasd_path_verify(device, chp);
1221 }
1222
dasd_path_get_notoperpm(struct dasd_device * device)1223 static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device)
1224 {
1225 int chp;
1226 __u8 nopm = 0x00;
1227
1228 for (chp = 0; chp < 8; chp++)
1229 if (dasd_path_is_nohpf(device, chp) ||
1230 dasd_path_is_ifcc(device, chp) ||
1231 dasd_path_is_cuir(device, chp) ||
1232 dasd_path_is_miscabled(device, chp))
1233 nopm |= 0x80 >> chp;
1234 return nopm;
1235 }
1236
dasd_path_add_opm(struct dasd_device * device,__u8 pm)1237 static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm)
1238 {
1239 int chp;
1240
1241 for (chp = 0; chp < 8; chp++)
1242 if (pm & (0x80 >> chp)) {
1243 dasd_path_operational(device, chp);
1244 /*
1245 * if the path is used
1246 * it should not be in one of the negative lists
1247 */
1248 dasd_path_clear_nohpf(device, chp);
1249 dasd_path_clear_cuir(device, chp);
1250 dasd_path_clear_cable(device, chp);
1251 dasd_path_clear_ifcc(device, chp);
1252 }
1253 }
1254
dasd_path_add_cablepm(struct dasd_device * device,__u8 pm)1255 static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm)
1256 {
1257 int chp;
1258
1259 for (chp = 0; chp < 8; chp++)
1260 if (pm & (0x80 >> chp))
1261 dasd_path_miscabled(device, chp);
1262 }
1263
dasd_path_add_cuirpm(struct dasd_device * device,__u8 pm)1264 static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm)
1265 {
1266 int chp;
1267
1268 for (chp = 0; chp < 8; chp++)
1269 if (pm & (0x80 >> chp))
1270 dasd_path_cuir(device, chp);
1271 }
1272
dasd_path_add_ifccpm(struct dasd_device * device,__u8 pm)1273 static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm)
1274 {
1275 int chp;
1276
1277 for (chp = 0; chp < 8; chp++)
1278 if (pm & (0x80 >> chp))
1279 dasd_path_ifcc(device, chp);
1280 }
1281
dasd_path_add_nppm(struct dasd_device * device,__u8 pm)1282 static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm)
1283 {
1284 int chp;
1285
1286 for (chp = 0; chp < 8; chp++)
1287 if (pm & (0x80 >> chp))
1288 dasd_path_nonpreferred(device, chp);
1289 }
1290
dasd_path_add_nohpfpm(struct dasd_device * device,__u8 pm)1291 static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm)
1292 {
1293 int chp;
1294
1295 for (chp = 0; chp < 8; chp++)
1296 if (pm & (0x80 >> chp))
1297 dasd_path_nohpf(device, chp);
1298 }
1299
dasd_path_add_ppm(struct dasd_device * device,__u8 pm)1300 static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm)
1301 {
1302 int chp;
1303
1304 for (chp = 0; chp < 8; chp++)
1305 if (pm & (0x80 >> chp))
1306 dasd_path_preferred(device, chp);
1307 }
1308
1309 /*
1310 * set functions for path masks
1311 * the existing path mask will be replaced by the given path mask
1312 */
dasd_path_set_tbvpm(struct dasd_device * device,__u8 pm)1313 static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm)
1314 {
1315 int chp;
1316
1317 for (chp = 0; chp < 8; chp++)
1318 if (pm & (0x80 >> chp))
1319 dasd_path_verify(device, chp);
1320 else
1321 dasd_path_clear_verify(device, chp);
1322 }
1323
dasd_path_set_opm(struct dasd_device * device,__u8 pm)1324 static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm)
1325 {
1326 int chp;
1327
1328 for (chp = 0; chp < 8; chp++) {
1329 dasd_path_clear_oper(device, chp);
1330 if (pm & (0x80 >> chp)) {
1331 dasd_path_operational(device, chp);
1332 /*
1333 * if the path is used
1334 * it should not be in one of the negative lists
1335 */
1336 dasd_path_clear_nohpf(device, chp);
1337 dasd_path_clear_cuir(device, chp);
1338 dasd_path_clear_cable(device, chp);
1339 dasd_path_clear_ifcc(device, chp);
1340 }
1341 }
1342 }
1343
1344 /*
1345 * remove functions for path masks
1346 * the existing path mask will be cleared with the given path mask
1347 */
dasd_path_remove_opm(struct dasd_device * device,__u8 pm)1348 static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm)
1349 {
1350 int chp;
1351
1352 for (chp = 0; chp < 8; chp++) {
1353 if (pm & (0x80 >> chp))
1354 dasd_path_clear_oper(device, chp);
1355 }
1356 }
1357
1358 /*
1359 * add the newly available path to the to be verified pm and remove it from
1360 * normal operation until it is verified
1361 */
dasd_path_available(struct dasd_device * device,int chp)1362 static inline void dasd_path_available(struct dasd_device *device, int chp)
1363 {
1364 dasd_path_clear_oper(device, chp);
1365 dasd_path_verify(device, chp);
1366 }
1367
dasd_path_notoper(struct dasd_device * device,int chp)1368 static inline void dasd_path_notoper(struct dasd_device *device, int chp)
1369 {
1370 dasd_path_clear_oper(device, chp);
1371 dasd_path_clear_preferred(device, chp);
1372 dasd_path_clear_nonpreferred(device, chp);
1373 }
1374
dasd_path_fcsec_update(struct dasd_device * device,int chp)1375 static inline void dasd_path_fcsec_update(struct dasd_device *device, int chp)
1376 {
1377 dasd_path_fcsec(device, chp);
1378 }
1379
1380 /*
1381 * remove all paths from normal operation
1382 */
dasd_path_no_path(struct dasd_device * device)1383 static inline void dasd_path_no_path(struct dasd_device *device)
1384 {
1385 int chp;
1386
1387 for (chp = 0; chp < 8; chp++)
1388 dasd_path_notoper(device, chp);
1389
1390 dasd_path_clear_all_verify(device);
1391 }
1392
1393 /* end - path handling */
1394
1395 #endif /* DASD_H */
1396