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