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/hdreg.h>
51#include <linux/interrupt.h>
52#include <linux/log2.h>
53#include <asm/ccwdev.h>
54#include <linux/workqueue.h>
55#include <asm/debug.h>
56#include <asm/dasd.h>
57#include <asm/idals.h>
58#include <linux/bitops.h>
59#include <linux/blk-mq.h>
60
61/* DASD discipline magic */
62#define DASD_ECKD_MAGIC 0xC5C3D2C4
63#define DASD_DIAG_MAGIC 0xC4C9C1C7
64#define DASD_FBA_MAGIC 0xC6C2C140
65
66/*
67 * SECTION: Type definitions
68 */
69struct dasd_device;
70struct dasd_block;
71
72/* BIT DEFINITIONS FOR SENSE DATA */
73#define DASD_SENSE_BIT_0 0x80
74#define DASD_SENSE_BIT_1 0x40
75#define DASD_SENSE_BIT_2 0x20
76#define DASD_SENSE_BIT_3 0x10
77
78/* BIT DEFINITIONS FOR SIM SENSE */
79#define DASD_SIM_SENSE 0x0F
80#define DASD_SIM_MSG_TO_OP 0x03
81#define DASD_SIM_LOG 0x0C
82
83/* lock class for nested cdev lock */
84#define CDEV_NESTED_FIRST 1
85#define CDEV_NESTED_SECOND 2
86
87/*
88 * SECTION: MACROs for klogd and s390 debug feature (dbf)
89 */
90#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
91do { \
92 debug_sprintf_event(d_device->debug_area, \
93 d_level, \
94 d_str "\n", \
95 d_data); \
96} while(0)
97
98#define DBF_EVENT(d_level, d_str, d_data...)\
99do { \
100 debug_sprintf_event(dasd_debug_area, \
101 d_level,\
102 d_str "\n", \
103 d_data); \
104} while(0)
105
106#define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \
107do { \
108 struct ccw_dev_id __dev_id; \
109 ccw_device_get_id(d_cdev, &__dev_id); \
110 debug_sprintf_event(dasd_debug_area, \
111 d_level, \
112 "0.%x.%04x " d_str "\n", \
113 __dev_id.ssid, __dev_id.devno, d_data); \
114} while (0)
115
116/* limit size for an errorstring */
117#define ERRORLENGTH 30
118
119/* definition of dbf debug levels */
120#define DBF_EMERG 0 /* system is unusable */
121#define DBF_ALERT 1 /* action must be taken immediately */
122#define DBF_CRIT 2 /* critical conditions */
123#define DBF_ERR 3 /* error conditions */
124#define DBF_WARNING 4 /* warning conditions */
125#define DBF_NOTICE 5 /* normal but significant condition */
126#define DBF_INFO 6 /* informational */
127#define DBF_DEBUG 6 /* debug-level messages */
128
129/* messages to be written via klogd and dbf */
130#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
131do { \
132 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
133 dev_name(&d_device->cdev->dev), d_args); \
134 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
135} while(0)
136
137#define MESSAGE(d_loglevel,d_string,d_args...)\
138do { \
139 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
140 DBF_EVENT(DBF_ALERT, d_string, d_args); \
141} while(0)
142
143/* messages to be written via klogd only */
144#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
145do { \
146 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
147 dev_name(&d_device->cdev->dev), d_args); \
148} while(0)
149
150#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
151do { \
152 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
153} while(0)
154
155/* Macro to calculate number of blocks per page */
156#define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize)
157
158struct dasd_ccw_req {
159 unsigned int magic; /* Eye catcher */
160 int intrc; /* internal error, e.g. from start_IO */
161 struct list_head devlist; /* for dasd_device request queue */
162 struct list_head blocklist; /* for dasd_block request queue */
163 struct dasd_block *block; /* the originating block device */
164 struct dasd_device *memdev; /* the device used to allocate this */
165 struct dasd_device *startdev; /* device the request is started on */
166 struct dasd_device *basedev; /* base device if no block->base */
167 void *cpaddr; /* address of ccw or tcw */
168 short retries; /* A retry counter */
169 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
170 char status; /* status of this request */
171 char lpm; /* logical path mask */
172 unsigned long flags; /* flags of this request */
173 struct dasd_queue *dq;
174 unsigned long starttime; /* jiffies time of request start */
175 unsigned long expires; /* expiration period in jiffies */
176 void *data; /* pointer to data area */
177 struct irb irb; /* device status in case of an error */
178 struct dasd_ccw_req *refers; /* ERP-chain queueing. */
179 void *function; /* originating ERP action */
180 void *mem_chunk;
181
182 unsigned long buildclk; /* TOD-clock of request generation */
183 unsigned long startclk; /* TOD-clock of request start */
184 unsigned long stopclk; /* TOD-clock of request interrupt */
185 unsigned long endclk; /* TOD-clock of request termination */
186
187 void (*callback)(struct dasd_ccw_req *, void *data);
188 void *callback_data;
189 unsigned int proc_bytes; /* bytes for partial completion */
190 unsigned int trkcount; /* count formatted tracks */
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. */
235typedef 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
252struct 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#define DASD_UID_STRLEN ( /* vendor */ 3 + 1 + /* serial */ 14 + 1 + \
263 /* SSID */ 4 + 1 + /* unit addr */ 2 + 1 + \
264 /* vduit */ 32 + 1)
265
266/*
267 * PPRC Status data
268 */
269struct dasd_pprc_header {
270 __u8 entries; /* 0 Number of device entries */
271 __u8 unused; /* 1 unused */
272 __u16 entry_length; /* 2-3 Length of device entry */
273 __u32 unused2; /* 4-7 unused */
274} __packed;
275
276struct dasd_pprc_dev_info {
277 __u8 state; /* 0 Copy State */
278 __u8 flags; /* 1 Flags */
279 __u8 reserved1[2]; /* 2-3 reserved */
280 __u8 prim_lss; /* 4 Primary device LSS */
281 __u8 primary; /* 5 Primary device address */
282 __u8 sec_lss; /* 6 Secondary device LSS */
283 __u8 secondary; /* 7 Secondary device address */
284 __u16 pprc_id; /* 8-9 Peer-to-Peer Remote Copy ID */
285 __u8 reserved2[12]; /* 10-21 reserved */
286 __u16 prim_cu_ssid; /* 22-23 Pimary Control Unit SSID */
287 __u8 reserved3[12]; /* 24-35 reserved */
288 __u16 sec_cu_ssid; /* 36-37 Secondary Control Unit SSID */
289 __u8 reserved4[90]; /* 38-127 reserved */
290} __packed;
291
292struct dasd_pprc_data_sc4 {
293 struct dasd_pprc_header header;
294 struct dasd_pprc_dev_info dev_info[5];
295} __packed;
296
297#define DASD_BUS_ID_SIZE 20
298#define DASD_CP_ENTRIES 5
299
300struct dasd_copy_entry {
301 char busid[DASD_BUS_ID_SIZE];
302 struct dasd_device *device;
303 bool primary;
304 bool configured;
305};
306
307struct dasd_copy_relation {
308 struct dasd_copy_entry entry[DASD_CP_ENTRIES];
309 struct dasd_copy_entry *active;
310};
311
312int dasd_devmap_set_device_copy_relation(struct ccw_device *,
313 bool pprc_enabled);
314
315/*
316 * the struct dasd_discipline is
317 * sth like a table of virtual functions, if you think of dasd_eckd
318 * inheriting dasd...
319 * no, currently we are not planning to reimplement the driver in C++
320 */
321struct dasd_discipline {
322 struct module *owner;
323 char ebcname[8]; /* a name used for tagging and printks */
324 char name[8]; /* a name used for tagging and printks */
325
326 struct list_head list; /* used for list of disciplines */
327
328 /*
329 * Device recognition functions. check_device is used to verify
330 * the sense data and the information returned by read device
331 * characteristics. It returns 0 if the discipline can be used
332 * for the device in question. uncheck_device is called during
333 * device shutdown to deregister a device from its discipline.
334 */
335 int (*check_device) (struct dasd_device *);
336 void (*uncheck_device) (struct dasd_device *);
337
338 /*
339 * do_analysis is used in the step from device state "basic" to
340 * state "accept". It returns 0 if the device can be made ready,
341 * it returns -EMEDIUMTYPE if the device can't be made ready or
342 * -EAGAIN if do_analysis started a ccw that needs to complete
343 * before the analysis may be repeated.
344 */
345 int (*do_analysis) (struct dasd_block *);
346
347 /*
348 * This function is called, when new paths become available.
349 * Disciplins may use this callback to do necessary setup work,
350 * e.g. verify that new path is compatible with the current
351 * configuration.
352 */
353 int (*pe_handler)(struct dasd_device *, __u8, __u8);
354
355 /*
356 * Last things to do when a device is set online, and first things
357 * when it is set offline.
358 */
359 int (*basic_to_ready) (struct dasd_device *);
360 int (*online_to_ready) (struct dasd_device *);
361 int (*basic_to_known)(struct dasd_device *);
362
363 /*
364 * Initialize block layer request queue.
365 */
366 void (*setup_blk_queue)(struct dasd_block *);
367 /* (struct dasd_device *);
368 * Device operation functions. build_cp creates a ccw chain for
369 * a block device request, start_io starts the request and
370 * term_IO cancels it (e.g. in case of a timeout). format_device
371 * formats the device and check_device_format compares the format of
372 * a device with the expected format_data.
373 * handle_terminated_request allows to examine a cqr and prepare
374 * it for retry.
375 */
376 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
377 struct dasd_block *,
378 struct request *);
379 int (*start_IO) (struct dasd_ccw_req *);
380 int (*term_IO) (struct dasd_ccw_req *);
381 void (*handle_terminated_request) (struct dasd_ccw_req *);
382 int (*format_device) (struct dasd_device *,
383 struct format_data_t *, int);
384 int (*check_device_format)(struct dasd_device *,
385 struct format_check_t *, int);
386 int (*free_cp) (struct dasd_ccw_req *, struct request *);
387
388 /*
389 * Error recovery functions. examine_error() returns a value that
390 * indicates what to do for an error condition. If examine_error()
391 * returns 'dasd_era_recover' erp_action() is called to create a
392 * special error recovery ccw. erp_postaction() is called after
393 * an error recovery ccw has finished its execution. dump_sense
394 * is called for every error condition to print the sense data
395 * to the console.
396 */
397 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
398 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
399 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
400 struct irb *);
401 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
402 void (*check_for_device_change) (struct dasd_device *,
403 struct dasd_ccw_req *,
404 struct irb *);
405
406 /* i/o control functions. */
407 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
408 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
409 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
410
411 /* reload device after state change */
412 int (*reload) (struct dasd_device *);
413
414 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
415 void (*kick_validate) (struct dasd_device *);
416 int (*check_attention)(struct dasd_device *, __u8);
417 int (*host_access_count)(struct dasd_device *);
418 int (*hosts_print)(struct dasd_device *, struct seq_file *);
419 void (*handle_hpf_error)(struct dasd_device *, struct irb *);
420 void (*disable_hpf)(struct dasd_device *);
421 int (*hpf_enabled)(struct dasd_device *);
422 void (*reset_path)(struct dasd_device *, __u8);
423
424 /*
425 * Extent Space Efficient (ESE) relevant functions
426 */
427 int (*is_ese)(struct dasd_device *);
428 /* Capacity */
429 int (*space_allocated)(struct dasd_device *);
430 int (*space_configured)(struct dasd_device *);
431 int (*logical_capacity)(struct dasd_device *);
432 int (*release_space)(struct dasd_device *, struct format_data_t *);
433 /* Extent Pool */
434 int (*ext_pool_id)(struct dasd_device *);
435 int (*ext_size)(struct dasd_device *);
436 int (*ext_pool_cap_at_warnlevel)(struct dasd_device *);
437 int (*ext_pool_warn_thrshld)(struct dasd_device *);
438 int (*ext_pool_oos)(struct dasd_device *);
439 int (*ext_pool_exhaust)(struct dasd_device *, struct dasd_ccw_req *);
440 struct dasd_ccw_req *(*ese_format)(struct dasd_device *,
441 struct dasd_ccw_req *, struct irb *);
442 int (*ese_read)(struct dasd_ccw_req *, struct irb *);
443 int (*pprc_status)(struct dasd_device *, struct dasd_pprc_data_sc4 *);
444 bool (*pprc_enabled)(struct dasd_device *);
445 int (*copy_pair_swap)(struct dasd_device *, char *, char *);
446 int (*device_ping)(struct dasd_device *);
447};
448
449extern struct dasd_discipline *dasd_diag_discipline_pointer;
450
451/* Trigger IDs for extended error reporting DASD EER and autoquiesce */
452enum eer_trigger {
453 DASD_EER_FATALERROR = 1,
454 DASD_EER_NOPATH,
455 DASD_EER_STATECHANGE,
456 DASD_EER_PPRCSUSPEND,
457 DASD_EER_NOSPC,
458 DASD_EER_TIMEOUTS,
459 DASD_EER_STARTIO,
460
461 /* enum end marker, only add new trigger above */
462 DASD_EER_MAX,
463 DASD_EER_AUTOQUIESCE = 31, /* internal only */
464};
465
466#define DASD_EER_VALID ((1U << DASD_EER_MAX) - 1)
467
468/* DASD path handling */
469
470#define DASD_PATH_OPERATIONAL 1
471#define DASD_PATH_TBV 2
472#define DASD_PATH_PP 3
473#define DASD_PATH_NPP 4
474#define DASD_PATH_MISCABLED 5
475#define DASD_PATH_NOHPF 6
476#define DASD_PATH_CUIR 7
477#define DASD_PATH_IFCC 8
478#define DASD_PATH_FCSEC 9
479
480#define DASD_THRHLD_MAX 4294967295U
481#define DASD_INTERVAL_MAX 4294967295U
482
483/* FC Endpoint Security Capabilities */
484#define DASD_FC_SECURITY_UNSUP 0
485#define DASD_FC_SECURITY_AUTH 1
486#define DASD_FC_SECURITY_ENC_FCSP2 2
487#define DASD_FC_SECURITY_ENC_ERAS 3
488
489#define DASD_FC_SECURITY_ENC_STR "Encryption"
490static const struct {
491 u8 value;
492 char *name;
493} dasd_path_fcs_mnemonics[] = {
494 { DASD_FC_SECURITY_UNSUP, "Unsupported" },
495 { DASD_FC_SECURITY_AUTH, "Authentication" },
496 { DASD_FC_SECURITY_ENC_FCSP2, DASD_FC_SECURITY_ENC_STR },
497 { DASD_FC_SECURITY_ENC_ERAS, DASD_FC_SECURITY_ENC_STR },
498};
499
500static inline char *dasd_path_get_fcs_str(int val)
501{
502 int i;
503
504 for (i = 0; i < ARRAY_SIZE(dasd_path_fcs_mnemonics); i++) {
505 if (dasd_path_fcs_mnemonics[i].value == val)
506 return dasd_path_fcs_mnemonics[i].name;
507 }
508
509 return dasd_path_fcs_mnemonics[0].name;
510}
511
512struct dasd_path {
513 unsigned long flags;
514 u8 cssid;
515 u8 ssid;
516 u8 chpid;
517 struct dasd_conf_data *conf_data;
518 atomic_t error_count;
519 unsigned long errorclk;
520 u8 fc_security;
521 struct kobject kobj;
522 bool in_sysfs;
523};
524
525#define to_dasd_path(path) container_of(path, struct dasd_path, kobj)
526
527static inline void dasd_path_release(struct kobject *kobj)
528{
529/* Memory for the dasd_path kobject is freed when dasd_free_device() is called */
530}
531
532
533struct dasd_profile_info {
534 /* legacy part of profile data, as in dasd_profile_info_t */
535 unsigned int dasd_io_reqs; /* number of requests processed */
536 unsigned int dasd_io_sects; /* number of sectors processed */
537 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
538 unsigned int dasd_io_times[32]; /* histogram of requests's times */
539 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */
540 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
541 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
542 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
543 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
544 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
545
546 /* new data */
547 struct timespec64 starttod; /* time of start or last reset */
548 unsigned int dasd_io_alias; /* requests using an alias */
549 unsigned int dasd_io_tpm; /* requests using transport mode */
550 unsigned int dasd_read_reqs; /* total number of read requests */
551 unsigned int dasd_read_sects; /* total number read sectors */
552 unsigned int dasd_read_alias; /* read request using an alias */
553 unsigned int dasd_read_tpm; /* read requests in transport mode */
554 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
555 unsigned int dasd_read_times[32]; /* histogram of requests's times */
556 unsigned int dasd_read_time1[32]; /* hist. time from build to start */
557 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
558 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
559 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
560 unsigned long dasd_sum_times; /* sum of request times */
561 unsigned long dasd_sum_time_str; /* sum of time from build to start */
562 unsigned long dasd_sum_time_irq; /* sum of time from start to irq */
563 unsigned long dasd_sum_time_end; /* sum of time from irq to end */
564};
565
566struct dasd_profile {
567 struct dentry *dentry;
568 struct dasd_profile_info *data;
569 spinlock_t lock;
570};
571
572struct dasd_format_entry {
573 struct list_head list;
574 sector_t track;
575};
576
577struct dasd_device {
578 /* Block device stuff. */
579 struct dasd_block *block;
580
581 unsigned int devindex;
582 unsigned long flags; /* per device flags */
583 unsigned short features; /* copy of devmap-features (read-only!) */
584
585 /* extended error reporting stuff (eer) */
586 struct dasd_ccw_req *eer_cqr;
587
588 /* Device discipline stuff. */
589 struct dasd_discipline *discipline;
590 struct dasd_discipline *base_discipline;
591 void *private;
592 struct dasd_path path[8];
593 __u8 opm;
594
595 /* Device state and target state. */
596 int state, target;
597 struct mutex state_mutex;
598 int stopped; /* device (ccw_device_start) was stopped */
599
600 /* reference count. */
601 atomic_t ref_count;
602
603 /* ccw queue and memory for static ccw/erp buffers. */
604 struct list_head ccw_queue;
605 spinlock_t mem_lock;
606 void *ccw_mem;
607 void *erp_mem;
608 void *ese_mem;
609 struct list_head ccw_chunks;
610 struct list_head erp_chunks;
611 struct list_head ese_chunks;
612
613 atomic_t tasklet_scheduled;
614 struct tasklet_struct tasklet;
615 struct work_struct kick_work;
616 struct work_struct reload_device;
617 struct work_struct kick_validate;
618 struct work_struct suc_work;
619 struct work_struct requeue_requests;
620 struct timer_list timer;
621
622 debug_info_t *debug_area;
623
624 struct ccw_device *cdev;
625
626 /* hook for alias management */
627 struct list_head alias_list;
628
629 /* default expiration time in s */
630 unsigned long default_expires;
631 unsigned long default_retries;
632
633 unsigned long blk_timeout;
634
635 unsigned long path_thrhld;
636 unsigned long path_interval;
637
638 struct dentry *debugfs_dentry;
639 struct dentry *hosts_dentry;
640 struct dasd_profile profile;
641 struct dasd_format_entry format_entry;
642 struct kset *paths_info;
643 struct dasd_copy_relation *copy;
644 unsigned long aq_mask;
645 unsigned int aq_timeouts;
646};
647
648struct dasd_block {
649 /* Block device stuff. */
650 struct gendisk *gdp;
651 spinlock_t request_queue_lock;
652 struct blk_mq_tag_set tag_set;
653 struct bdev_handle *bdev_handle;
654 atomic_t open_count;
655
656 unsigned long blocks; /* size of volume in blocks */
657 unsigned int bp_block; /* bytes per block */
658 unsigned int s2b_shift; /* log2 (bp_block/512) */
659
660 struct dasd_device *base;
661 struct list_head ccw_queue;
662 spinlock_t queue_lock;
663
664 atomic_t tasklet_scheduled;
665 struct tasklet_struct tasklet;
666 struct timer_list timer;
667
668 struct dentry *debugfs_dentry;
669 struct dasd_profile profile;
670
671 struct list_head format_list;
672 spinlock_t format_lock;
673 atomic_t trkcount;
674};
675
676struct dasd_attention_data {
677 struct dasd_device *device;
678 __u8 lpum;
679};
680
681struct dasd_queue {
682 spinlock_t lock;
683};
684
685/* reasons why device (ccw_device_start) was stopped */
686#define DASD_STOPPED_NOT_ACC 1 /* not accessible */
687#define DASD_STOPPED_QUIESCE 2 /* Quiesced */
688#define DASD_STOPPED_PENDING 4 /* long busy */
689#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
690#define DASD_STOPPED_SU 16 /* summary unit check handling */
691#define DASD_STOPPED_PPRC 32 /* PPRC swap */
692#define DASD_STOPPED_NOSPC 128 /* no space left */
693
694/* per device flags */
695#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
696#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
697#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
698#define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
699 * confuse this with the user specified
700 * read-only feature.
701 */
702#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
703#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
704#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
705#define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
706#define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
707#define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
708#define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
709#define DASD_FLAG_SUC 14 /* unhandled summary unit check */
710
711#define DASD_SLEEPON_START_TAG ((void *) 1)
712#define DASD_SLEEPON_END_TAG ((void *) 2)
713
714void dasd_put_device_wake(struct dasd_device *);
715
716/*
717 * return values to be returned from the copy pair swap function
718 * 0x00: swap successful
719 * 0x01: swap data invalid
720 * 0x02: no active device found
721 * 0x03: wrong primary specified
722 * 0x04: secondary device not found
723 * 0x05: swap already running
724 */
725#define DASD_COPYPAIRSWAP_SUCCESS 0
726#define DASD_COPYPAIRSWAP_INVALID 1
727#define DASD_COPYPAIRSWAP_NOACTIVE 2
728#define DASD_COPYPAIRSWAP_PRIMARY 3
729#define DASD_COPYPAIRSWAP_SECONDARY 4
730#define DASD_COPYPAIRSWAP_MULTIPLE 5
731
732/*
733 * Reference count inliners
734 */
735static inline void
736dasd_get_device(struct dasd_device *device)
737{
738 atomic_inc(v: &device->ref_count);
739}
740
741static inline void
742dasd_put_device(struct dasd_device *device)
743{
744 if (atomic_dec_return(v: &device->ref_count) == 0)
745 dasd_put_device_wake(device);
746}
747
748/*
749 * The static memory in ccw_mem and erp_mem is managed by a sorted
750 * list of free memory chunks.
751 */
752struct dasd_mchunk
753{
754 struct list_head list;
755 unsigned long size;
756} __attribute__ ((aligned(8)));
757
758static inline void
759dasd_init_chunklist(struct list_head *chunk_list, void *mem,
760 unsigned long size)
761{
762 struct dasd_mchunk *chunk;
763
764 INIT_LIST_HEAD(list: chunk_list);
765 chunk = (struct dasd_mchunk *) mem;
766 chunk->size = size - sizeof(struct dasd_mchunk);
767 list_add(new: &chunk->list, head: chunk_list);
768}
769
770static inline void *
771dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
772{
773 struct dasd_mchunk *chunk, *tmp;
774
775 size = (size + 7L) & -8L;
776 list_for_each_entry(chunk, chunk_list, list) {
777 if (chunk->size < size)
778 continue;
779 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
780 char *endaddr = (char *) (chunk + 1) + chunk->size;
781 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
782 tmp->size = size;
783 chunk->size -= size + sizeof(struct dasd_mchunk);
784 chunk = tmp;
785 } else
786 list_del(entry: &chunk->list);
787 return (void *) (chunk + 1);
788 }
789 return NULL;
790}
791
792static inline void
793dasd_free_chunk(struct list_head *chunk_list, void *mem)
794{
795 struct dasd_mchunk *chunk, *tmp;
796 struct list_head *p, *left;
797
798 chunk = (struct dasd_mchunk *)
799 ((char *) mem - sizeof(struct dasd_mchunk));
800 /* Find out the left neighbour in chunk_list. */
801 left = chunk_list;
802 list_for_each(p, chunk_list) {
803 if (list_entry(p, struct dasd_mchunk, list) > chunk)
804 break;
805 left = p;
806 }
807 /* Try to merge with right neighbour = next element from left. */
808 if (left->next != chunk_list) {
809 tmp = list_entry(left->next, struct dasd_mchunk, list);
810 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
811 list_del(entry: &tmp->list);
812 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
813 }
814 }
815 /* Try to merge with left neighbour. */
816 if (left != chunk_list) {
817 tmp = list_entry(left, struct dasd_mchunk, list);
818 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
819 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
820 return;
821 }
822 }
823 __list_add(new: &chunk->list, prev: left, next: left->next);
824}
825
826/*
827 * Check if bsize is in { 512, 1024, 2048, 4096 }
828 */
829static inline int
830dasd_check_blocksize(int bsize)
831{
832 if (bsize < 512 || bsize > 4096 || !is_power_of_2(n: bsize))
833 return -EMEDIUMTYPE;
834 return 0;
835}
836
837/*
838 * return the callback data of the original request in case there are
839 * ERP requests build on top of it
840 */
841static inline void *dasd_get_callback_data(struct dasd_ccw_req *cqr)
842{
843 while (cqr->refers)
844 cqr = cqr->refers;
845
846 return cqr->callback_data;
847}
848
849/* externals in dasd.c */
850#define DASD_PROFILE_OFF 0
851#define DASD_PROFILE_ON 1
852#define DASD_PROFILE_GLOBAL_ONLY 2
853
854extern debug_info_t *dasd_debug_area;
855extern struct dasd_profile dasd_global_profile;
856extern unsigned int dasd_global_profile_level;
857extern const struct block_device_operations dasd_device_operations;
858extern struct blk_mq_ops dasd_mq_ops;
859
860extern struct kmem_cache *dasd_page_cache;
861
862struct dasd_ccw_req *
863dasd_smalloc_request(int, int, int, struct dasd_device *, struct dasd_ccw_req *);
864struct dasd_ccw_req *dasd_fmalloc_request(int, int, int, struct dasd_device *);
865void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
866void dasd_ffree_request(struct dasd_ccw_req *, struct dasd_device *);
867void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
868
869struct dasd_device *dasd_alloc_device(void);
870void dasd_free_device(struct dasd_device *);
871
872struct dasd_block *dasd_alloc_block(void);
873void dasd_free_block(struct dasd_block *);
874
875enum blk_eh_timer_return dasd_times_out(struct request *req);
876
877void dasd_enable_device(struct dasd_device *);
878void dasd_set_target_state(struct dasd_device *, int);
879void dasd_kick_device(struct dasd_device *);
880void dasd_reload_device(struct dasd_device *);
881void dasd_schedule_requeue(struct dasd_device *);
882
883void dasd_add_request_head(struct dasd_ccw_req *);
884void dasd_add_request_tail(struct dasd_ccw_req *);
885int dasd_start_IO(struct dasd_ccw_req *);
886int dasd_term_IO(struct dasd_ccw_req *);
887void dasd_schedule_device_bh(struct dasd_device *);
888void dasd_schedule_block_bh(struct dasd_block *);
889int dasd_sleep_on(struct dasd_ccw_req *);
890int dasd_sleep_on_queue(struct list_head *);
891int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
892int dasd_sleep_on_queue_interruptible(struct list_head *);
893int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
894void dasd_device_set_timer(struct dasd_device *, int);
895void dasd_device_clear_timer(struct dasd_device *);
896void dasd_block_set_timer(struct dasd_block *, int);
897void dasd_block_clear_timer(struct dasd_block *);
898int dasd_cancel_req(struct dasd_ccw_req *);
899int dasd_flush_device_queue(struct dasd_device *);
900int dasd_generic_probe(struct ccw_device *);
901void dasd_generic_free_discipline(struct dasd_device *);
902void dasd_generic_remove (struct ccw_device *cdev);
903int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
904int dasd_generic_set_offline (struct ccw_device *cdev);
905int dasd_generic_notify(struct ccw_device *, int);
906int dasd_generic_last_path_gone(struct dasd_device *);
907int dasd_generic_path_operational(struct dasd_device *);
908void dasd_generic_shutdown(struct ccw_device *);
909
910void dasd_generic_handle_state_change(struct dasd_device *);
911enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
912void dasd_generic_path_event(struct ccw_device *, int *);
913int dasd_generic_verify_path(struct dasd_device *, __u8);
914void dasd_generic_space_exhaust(struct dasd_device *, struct dasd_ccw_req *);
915void dasd_generic_space_avail(struct dasd_device *);
916
917int dasd_generic_requeue_all_requests(struct dasd_device *);
918
919int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
920char *dasd_get_sense(struct irb *);
921
922void dasd_device_set_stop_bits(struct dasd_device *, int);
923void dasd_device_remove_stop_bits(struct dasd_device *, int);
924
925int dasd_device_is_ro(struct dasd_device *);
926
927void dasd_profile_reset(struct dasd_profile *);
928int dasd_profile_on(struct dasd_profile *);
929void dasd_profile_off(struct dasd_profile *);
930char *dasd_get_user_string(const char __user *, size_t);
931
932/* externals in dasd_devmap.c */
933extern int dasd_max_devindex;
934extern int dasd_probeonly;
935extern int dasd_autodetect;
936extern int dasd_nopav;
937extern int dasd_nofcx;
938
939int dasd_devmap_init(void);
940void dasd_devmap_exit(void);
941
942struct dasd_device *dasd_create_device(struct ccw_device *);
943void dasd_delete_device(struct dasd_device *);
944
945int dasd_get_feature(struct ccw_device *, int);
946int dasd_set_feature(struct ccw_device *, int, int);
947
948extern const struct attribute_group *dasd_dev_groups[];
949void dasd_path_create_kobj(struct dasd_device *, int);
950void dasd_path_create_kobjects(struct dasd_device *);
951void dasd_path_remove_kobjects(struct dasd_device *);
952
953struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
954struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
955struct dasd_device *dasd_device_from_devindex(int);
956
957void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
958struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
959
960int dasd_parse(void) __init;
961int dasd_busid_known(const char *);
962
963/* externals in dasd_gendisk.c */
964int dasd_gendisk_init(void);
965void dasd_gendisk_exit(void);
966int dasd_gendisk_alloc(struct dasd_block *);
967void dasd_gendisk_free(struct dasd_block *);
968int dasd_scan_partitions(struct dasd_block *);
969void dasd_destroy_partitions(struct dasd_block *);
970
971/* externals in dasd_ioctl.c */
972int dasd_ioctl(struct block_device *bdev, blk_mode_t mode, unsigned int cmd,
973 unsigned long arg);
974int dasd_set_read_only(struct block_device *bdev, bool ro);
975
976/* externals in dasd_proc.c */
977int dasd_proc_init(void);
978void dasd_proc_exit(void);
979
980/* externals in dasd_erp.c */
981struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
982struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
983struct dasd_ccw_req *dasd_alloc_erp_request(unsigned int, int, int,
984 struct dasd_device *);
985void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
986void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
987void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
988
989/* externals in dasd_3990_erp.c */
990struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
991void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
992
993/* externals in dasd_eer.c */
994#ifdef CONFIG_DASD_EER
995int dasd_eer_init(void);
996void dasd_eer_exit(void);
997int dasd_eer_enable(struct dasd_device *);
998void dasd_eer_disable(struct dasd_device *);
999void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
1000 unsigned int id);
1001void dasd_eer_snss(struct dasd_device *);
1002
1003static inline int dasd_eer_enabled(struct dasd_device *device)
1004{
1005 return device->eer_cqr != NULL;
1006}
1007#else
1008#define dasd_eer_init() (0)
1009#define dasd_eer_exit() do { } while (0)
1010#define dasd_eer_enable(d) (0)
1011#define dasd_eer_disable(d) do { } while (0)
1012#define dasd_eer_write(d,c,i) do { } while (0)
1013#define dasd_eer_snss(d) do { } while (0)
1014#define dasd_eer_enabled(d) (0)
1015#endif /* CONFIG_DASD_ERR */
1016
1017
1018/* DASD path handling functions */
1019
1020/*
1021 * helper functions to modify bit masks for a given channel path for a device
1022 */
1023static inline int dasd_path_is_operational(struct dasd_device *device, int chp)
1024{
1025 return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
1026}
1027
1028static inline int dasd_path_need_verify(struct dasd_device *device, int chp)
1029{
1030 return test_bit(DASD_PATH_TBV, &device->path[chp].flags);
1031}
1032
1033static inline void dasd_path_verify(struct dasd_device *device, int chp)
1034{
1035 __set_bit(DASD_PATH_TBV, &device->path[chp].flags);
1036}
1037
1038static inline void dasd_path_clear_verify(struct dasd_device *device, int chp)
1039{
1040 __clear_bit(DASD_PATH_TBV, &device->path[chp].flags);
1041}
1042
1043static inline void dasd_path_clear_all_verify(struct dasd_device *device)
1044{
1045 int chp;
1046
1047 for (chp = 0; chp < 8; chp++)
1048 dasd_path_clear_verify(device, chp);
1049}
1050
1051static inline void dasd_path_fcsec(struct dasd_device *device, int chp)
1052{
1053 __set_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
1054}
1055
1056static inline void dasd_path_clear_fcsec(struct dasd_device *device, int chp)
1057{
1058 __clear_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
1059}
1060
1061static inline int dasd_path_need_fcsec(struct dasd_device *device, int chp)
1062{
1063 return test_bit(DASD_PATH_FCSEC, &device->path[chp].flags);
1064}
1065
1066static inline void dasd_path_clear_all_fcsec(struct dasd_device *device)
1067{
1068 int chp;
1069
1070 for (chp = 0; chp < 8; chp++)
1071 dasd_path_clear_fcsec(device, chp);
1072}
1073
1074static inline void dasd_path_operational(struct dasd_device *device, int chp)
1075{
1076 __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
1077 device->opm |= (0x80 >> chp);
1078}
1079
1080static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp)
1081{
1082 __set_bit(DASD_PATH_NPP, &device->path[chp].flags);
1083}
1084
1085static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp)
1086{
1087 return test_bit(DASD_PATH_NPP, &device->path[chp].flags);
1088}
1089
1090static inline void dasd_path_clear_nonpreferred(struct dasd_device *device,
1091 int chp)
1092{
1093 __clear_bit(DASD_PATH_NPP, &device->path[chp].flags);
1094}
1095
1096static inline void dasd_path_preferred(struct dasd_device *device, int chp)
1097{
1098 __set_bit(DASD_PATH_PP, &device->path[chp].flags);
1099}
1100
1101static inline int dasd_path_is_preferred(struct dasd_device *device, int chp)
1102{
1103 return test_bit(DASD_PATH_PP, &device->path[chp].flags);
1104}
1105
1106static inline void dasd_path_clear_preferred(struct dasd_device *device,
1107 int chp)
1108{
1109 __clear_bit(DASD_PATH_PP, &device->path[chp].flags);
1110}
1111
1112static inline void dasd_path_clear_oper(struct dasd_device *device, int chp)
1113{
1114 __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
1115 device->opm &= ~(0x80 >> chp);
1116}
1117
1118static inline void dasd_path_clear_cable(struct dasd_device *device, int chp)
1119{
1120 __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1121}
1122
1123static inline void dasd_path_cuir(struct dasd_device *device, int chp)
1124{
1125 __set_bit(DASD_PATH_CUIR, &device->path[chp].flags);
1126}
1127
1128static inline int dasd_path_is_cuir(struct dasd_device *device, int chp)
1129{
1130 return test_bit(DASD_PATH_CUIR, &device->path[chp].flags);
1131}
1132
1133static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp)
1134{
1135 __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags);
1136}
1137
1138static inline void dasd_path_ifcc(struct dasd_device *device, int chp)
1139{
1140 set_bit(DASD_PATH_IFCC, addr: &device->path[chp].flags);
1141}
1142
1143static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp)
1144{
1145 return test_bit(DASD_PATH_IFCC, &device->path[chp].flags);
1146}
1147
1148static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp)
1149{
1150 clear_bit(DASD_PATH_IFCC, addr: &device->path[chp].flags);
1151}
1152
1153static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp)
1154{
1155 __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1156}
1157
1158static inline void dasd_path_miscabled(struct dasd_device *device, int chp)
1159{
1160 __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1161}
1162
1163static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp)
1164{
1165 return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1166}
1167
1168static inline void dasd_path_nohpf(struct dasd_device *device, int chp)
1169{
1170 __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1171}
1172
1173static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp)
1174{
1175 return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1176}
1177
1178/*
1179 * get functions for path masks
1180 * will return a path masks for the given device
1181 */
1182
1183static inline __u8 dasd_path_get_opm(struct dasd_device *device)
1184{
1185 return device->opm;
1186}
1187
1188static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device)
1189{
1190 int chp;
1191 __u8 tbvpm = 0x00;
1192
1193 for (chp = 0; chp < 8; chp++)
1194 if (dasd_path_need_verify(device, chp))
1195 tbvpm |= 0x80 >> chp;
1196 return tbvpm;
1197}
1198
1199static inline int dasd_path_get_fcsecpm(struct dasd_device *device)
1200{
1201 int chp;
1202
1203 for (chp = 0; chp < 8; chp++)
1204 if (dasd_path_need_fcsec(device, chp))
1205 return 1;
1206
1207 return 0;
1208}
1209
1210static inline __u8 dasd_path_get_nppm(struct dasd_device *device)
1211{
1212 int chp;
1213 __u8 npm = 0x00;
1214
1215 for (chp = 0; chp < 8; chp++) {
1216 if (dasd_path_is_nonpreferred(device, chp))
1217 npm |= 0x80 >> chp;
1218 }
1219 return npm;
1220}
1221
1222static inline __u8 dasd_path_get_ppm(struct dasd_device *device)
1223{
1224 int chp;
1225 __u8 ppm = 0x00;
1226
1227 for (chp = 0; chp < 8; chp++)
1228 if (dasd_path_is_preferred(device, chp))
1229 ppm |= 0x80 >> chp;
1230 return ppm;
1231}
1232
1233static inline __u8 dasd_path_get_cablepm(struct dasd_device *device)
1234{
1235 int chp;
1236 __u8 cablepm = 0x00;
1237
1238 for (chp = 0; chp < 8; chp++)
1239 if (dasd_path_is_miscabled(device, chp))
1240 cablepm |= 0x80 >> chp;
1241 return cablepm;
1242}
1243
1244static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device)
1245{
1246 int chp;
1247 __u8 cuirpm = 0x00;
1248
1249 for (chp = 0; chp < 8; chp++)
1250 if (dasd_path_is_cuir(device, chp))
1251 cuirpm |= 0x80 >> chp;
1252 return cuirpm;
1253}
1254
1255static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device)
1256{
1257 int chp;
1258 __u8 ifccpm = 0x00;
1259
1260 for (chp = 0; chp < 8; chp++)
1261 if (dasd_path_is_ifcc(device, chp))
1262 ifccpm |= 0x80 >> chp;
1263 return ifccpm;
1264}
1265
1266static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device)
1267{
1268 int chp;
1269 __u8 hpfpm = 0x00;
1270
1271 for (chp = 0; chp < 8; chp++)
1272 if (dasd_path_is_nohpf(device, chp))
1273 hpfpm |= 0x80 >> chp;
1274 return hpfpm;
1275}
1276
1277static inline u8 dasd_path_get_fcs_path(struct dasd_device *device, int chp)
1278{
1279 return device->path[chp].fc_security;
1280}
1281
1282static inline int dasd_path_get_fcs_device(struct dasd_device *device)
1283{
1284 u8 fc_sec = 0;
1285 int chp;
1286
1287 for (chp = 0; chp < 8; chp++) {
1288 if (device->opm & (0x80 >> chp)) {
1289 fc_sec = device->path[chp].fc_security;
1290 break;
1291 }
1292 }
1293 for (; chp < 8; chp++) {
1294 if (device->opm & (0x80 >> chp))
1295 if (device->path[chp].fc_security != fc_sec)
1296 return -EINVAL;
1297 }
1298
1299 return fc_sec;
1300}
1301
1302/*
1303 * add functions for path masks
1304 * the existing path mask will be extended by the given path mask
1305 */
1306static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm)
1307{
1308 int chp;
1309
1310 for (chp = 0; chp < 8; chp++)
1311 if (pm & (0x80 >> chp))
1312 dasd_path_verify(device, chp);
1313}
1314
1315static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device)
1316{
1317 int chp;
1318 __u8 nopm = 0x00;
1319
1320 for (chp = 0; chp < 8; chp++)
1321 if (dasd_path_is_nohpf(device, chp) ||
1322 dasd_path_is_ifcc(device, chp) ||
1323 dasd_path_is_cuir(device, chp) ||
1324 dasd_path_is_miscabled(device, chp))
1325 nopm |= 0x80 >> chp;
1326 return nopm;
1327}
1328
1329static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm)
1330{
1331 int chp;
1332
1333 for (chp = 0; chp < 8; chp++)
1334 if (pm & (0x80 >> chp)) {
1335 dasd_path_operational(device, chp);
1336 /*
1337 * if the path is used
1338 * it should not be in one of the negative lists
1339 */
1340 dasd_path_clear_nohpf(device, chp);
1341 dasd_path_clear_cuir(device, chp);
1342 dasd_path_clear_cable(device, chp);
1343 dasd_path_clear_ifcc(device, chp);
1344 }
1345}
1346
1347static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm)
1348{
1349 int chp;
1350
1351 for (chp = 0; chp < 8; chp++)
1352 if (pm & (0x80 >> chp))
1353 dasd_path_miscabled(device, chp);
1354}
1355
1356static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm)
1357{
1358 int chp;
1359
1360 for (chp = 0; chp < 8; chp++)
1361 if (pm & (0x80 >> chp))
1362 dasd_path_cuir(device, chp);
1363}
1364
1365static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm)
1366{
1367 int chp;
1368
1369 for (chp = 0; chp < 8; chp++)
1370 if (pm & (0x80 >> chp))
1371 dasd_path_ifcc(device, chp);
1372}
1373
1374static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm)
1375{
1376 int chp;
1377
1378 for (chp = 0; chp < 8; chp++)
1379 if (pm & (0x80 >> chp))
1380 dasd_path_nonpreferred(device, chp);
1381}
1382
1383static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm)
1384{
1385 int chp;
1386
1387 for (chp = 0; chp < 8; chp++)
1388 if (pm & (0x80 >> chp))
1389 dasd_path_nohpf(device, chp);
1390}
1391
1392static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm)
1393{
1394 int chp;
1395
1396 for (chp = 0; chp < 8; chp++)
1397 if (pm & (0x80 >> chp))
1398 dasd_path_preferred(device, chp);
1399}
1400
1401static inline void dasd_path_add_fcsecpm(struct dasd_device *device, __u8 pm)
1402{
1403 int chp;
1404
1405 for (chp = 0; chp < 8; chp++)
1406 if (pm & (0x80 >> chp))
1407 dasd_path_fcsec(device, chp);
1408}
1409
1410/*
1411 * set functions for path masks
1412 * the existing path mask will be replaced by the given path mask
1413 */
1414static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm)
1415{
1416 int chp;
1417
1418 for (chp = 0; chp < 8; chp++)
1419 if (pm & (0x80 >> chp))
1420 dasd_path_verify(device, chp);
1421 else
1422 dasd_path_clear_verify(device, chp);
1423}
1424
1425static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm)
1426{
1427 int chp;
1428
1429 for (chp = 0; chp < 8; chp++) {
1430 dasd_path_clear_oper(device, chp);
1431 if (pm & (0x80 >> chp)) {
1432 dasd_path_operational(device, chp);
1433 /*
1434 * if the path is used
1435 * it should not be in one of the negative lists
1436 */
1437 dasd_path_clear_nohpf(device, chp);
1438 dasd_path_clear_cuir(device, chp);
1439 dasd_path_clear_cable(device, chp);
1440 dasd_path_clear_ifcc(device, chp);
1441 }
1442 }
1443}
1444
1445/*
1446 * remove functions for path masks
1447 * the existing path mask will be cleared with the given path mask
1448 */
1449static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm)
1450{
1451 int chp;
1452
1453 for (chp = 0; chp < 8; chp++) {
1454 if (pm & (0x80 >> chp))
1455 dasd_path_clear_oper(device, chp);
1456 }
1457}
1458
1459/*
1460 * add the newly available path to the to be verified pm and remove it from
1461 * normal operation until it is verified
1462 */
1463static inline void dasd_path_available(struct dasd_device *device, int chp)
1464{
1465 dasd_path_clear_oper(device, chp);
1466 dasd_path_verify(device, chp);
1467}
1468
1469static inline void dasd_path_notoper(struct dasd_device *device, int chp)
1470{
1471 dasd_path_clear_oper(device, chp);
1472 dasd_path_clear_preferred(device, chp);
1473 dasd_path_clear_nonpreferred(device, chp);
1474}
1475
1476static inline void dasd_path_fcsec_update(struct dasd_device *device, int chp)
1477{
1478 dasd_path_fcsec(device, chp);
1479}
1480
1481/*
1482 * remove all paths from normal operation
1483 */
1484static inline void dasd_path_no_path(struct dasd_device *device)
1485{
1486 int chp;
1487
1488 for (chp = 0; chp < 8; chp++)
1489 dasd_path_notoper(device, chp);
1490
1491 dasd_path_clear_all_verify(device);
1492}
1493
1494/* end - path handling */
1495
1496#endif /* DASD_H */
1497

source code of linux/drivers/s390/block/dasd_int.h