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Merge tag 'for-linus-4.8-ofs1' of git://git.kernel.org/pub/scm/linux/kernel/git/hubca...
[linux-2.6-block.git] / drivers / s390 / block / dasd_int.h
CommitLineData
138c014d 1/*
1da177e4 2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
138c014d 3 * Horst Hummel <Horst.Hummel@de.ibm.com>
1da177e4
LT		 4 * Martin Schwidefsky <schwidefsky@de.ibm.com>
5 * Bugreports.to..: <Linux390@de.ibm.com>
d41dd122 6 * Copyright IBM Corp. 1999, 2009
1da177e4
LT		 7 */
8
9#ifndef DASD_INT_H
10#define DASD_INT_H
11
1da177e4
LT		 12/* we keep old device allocation scheme; IOW, minors are still in 0..255 */
13#define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
14#define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
15
16/*
17 * States a dasd device can have:
18 * new: the dasd_device structure is allocated.
19 * known: the discipline for the device is identified.
20 * basic: the device can do basic i/o.
90f0094d 21 * unfmt: the device could not be analyzed (format is unknown).
1da177e4
LT		 22 * ready: partition detection is done and the device is can do block io.
23 * online: the device accepts requests from the block device queue.
24 *
25 * Things to do for startup state transitions:
26 * new -> known: find discipline for the device and create devfs entries.
27 * known -> basic: request irq line for the device.
28 * basic -> ready: do the initial analysis, e.g. format detection,
29 * do block device setup and detect partitions.
30 * ready -> online: schedule the device tasklet.
31 * Things to do for shutdown state transitions:
32 * online -> ready: just set the new device state.
33 * ready -> basic: flush requests from the block device layer, clear
34 * partition information and reset format information.
35 * basic -> known: terminate all requests and free irq.
36 * known -> new: remove devfs entries and forget discipline.
37 */
38
39#define DASD_STATE_NEW 0
40#define DASD_STATE_KNOWN 1
41#define DASD_STATE_BASIC 2
90f0094d
HH		 42#define DASD_STATE_UNFMT 3
43#define DASD_STATE_READY 4
44#define DASD_STATE_ONLINE 5
1da177e4
LT		 45
46#include <linux/module.h>
47#include <linux/wait.h>
48#include <linux/blkdev.h>
1da177e4
LT		 49#include <linux/genhd.h>
50#include <linux/hdreg.h>
51#include <linux/interrupt.h>
e108cebb 52#include <linux/log2.h>
1da177e4
LT		 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
68b781fe
SH		 59/* DASD discipline magic */
60#define DASD_ECKD_MAGIC 0xC5C3D2C4
61#define DASD_DIAG_MAGIC 0xC4C9C1C7
62#define DASD_FBA_MAGIC 0xC6C2C140
63
1da177e4
LT		 64/*
65 * SECTION: Type definitions
66 */
67struct dasd_device;
8e09f215 68struct dasd_block;
1da177e4
LT		 69
70/* BIT DEFINITIONS FOR SENSE DATA */
71#define DASD_SENSE_BIT_0 0x80
72#define DASD_SENSE_BIT_1 0x40
73#define DASD_SENSE_BIT_2 0x20
74#define DASD_SENSE_BIT_3 0x10
75
f60c768c
SH		 76/* BIT DEFINITIONS FOR SIM SENSE */
77#define DASD_SIM_SENSE 0x0F
78#define DASD_SIM_MSG_TO_OP 0x03
79#define DASD_SIM_LOG 0x0C
80
2dedf0d9
SH		 81/* lock class for nested cdev lock */
82#define CDEV_NESTED_FIRST 1
83#define CDEV_NESTED_SECOND 2
84
1da177e4
LT		 85/*
86 * SECTION: MACROs for klogd and s390 debug feature (dbf)
87 */
88#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
89do { \
90 debug_sprintf_event(d_device->debug_area, \
91 d_level, \
92 d_str "\n", \
93 d_data); \
94} while(0)
95
96#define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
97do { \
98 debug_sprintf_exception(d_device->debug_area, \
99 d_level, \
100 d_str "\n", \
101 d_data); \
102} while(0)
103
104#define DBF_EVENT(d_level, d_str, d_data...)\
105do { \
106 debug_sprintf_event(dasd_debug_area, \
107 d_level,\
108 d_str "\n", \
109 d_data); \
110} while(0)
111
b8ed5dd5
SH		 112#define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \
113do { \
114 struct ccw_dev_id __dev_id; \
115 ccw_device_get_id(d_cdev, &__dev_id); \
116 debug_sprintf_event(dasd_debug_area, \
117 d_level, \
118 "0.%x.%04x " d_str "\n", \
119 __dev_id.ssid, __dev_id.devno, d_data); \
120} while (0)
121
1da177e4
LT		 122#define DBF_EXC(d_level, d_str, d_data...)\
123do { \
124 debug_sprintf_exception(dasd_debug_area, \
125 d_level,\
126 d_str "\n", \
127 d_data); \
128} while(0)
129
fc19f381
SH		 130/* limit size for an errorstring */
131#define ERRORLENGTH 30
132
1da177e4
LT		 133/* definition of dbf debug levels */
134#define DBF_EMERG 0 /* system is unusable */
135#define DBF_ALERT 1 /* action must be taken immediately */
136#define DBF_CRIT 2 /* critical conditions */
137#define DBF_ERR 3 /* error conditions */
138#define DBF_WARNING 4 /* warning conditions */
139#define DBF_NOTICE 5 /* normal but significant condition */
140#define DBF_INFO 6 /* informational */
141#define DBF_DEBUG 6 /* debug-level messages */
142
143/* messages to be written via klogd and dbf */
144#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
145do { \
146 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
2a0217d5 147 dev_name(&d_device->cdev->dev), d_args); \
1da177e4
LT		 148 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
149} while(0)
150
151#define MESSAGE(d_loglevel,d_string,d_args...)\
152do { \
153 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
154 DBF_EVENT(DBF_ALERT, d_string, d_args); \
155} while(0)
156
157/* messages to be written via klogd only */
158#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
159do { \
160 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
2a0217d5 161 dev_name(&d_device->cdev->dev), d_args); \
1da177e4
LT		 162} while(0)
163
164#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
165do { \
166 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
167} while(0)
168
169struct dasd_ccw_req {
170 unsigned int magic; /* Eye catcher */
8e09f215
SW		 171 struct list_head devlist; /* for dasd_device request queue */
172 struct list_head blocklist; /* for dasd_block request queue */
1da177e4
LT		 173
174 /* Where to execute what... */
8e09f215
SW		 175 struct dasd_block *block; /* the originating block device */
176 struct dasd_device *memdev; /* the device used to allocate this */
177 struct dasd_device *startdev; /* device the request is started on */
29b8dd9d 178 struct dasd_device *basedev; /* base device if no block->base */
f3eb5384
SW		 179 void *cpaddr; /* address of ccw or tcw */
180 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
8e09f215 181 char status; /* status of this request */
1da177e4
LT		 182 short retries; /* A retry counter */
183 unsigned long flags; /* flags of this request */
184
185 /* ... and how */
186 unsigned long starttime; /* jiffies time of request start */
7c8faa86 187 unsigned long expires; /* expiration period in jiffies */
8e09f215 188 char lpm; /* logical path mask */
1da177e4
LT		 189 void *data; /* pointer to data area */
190
191 /* these are important for recovering erroneous requests */
6cc7f168 192 int intrc; /* internal error, e.g. from start_IO */
1da177e4
LT		 193 struct irb irb; /* device status in case of an error */
194 struct dasd_ccw_req *refers; /* ERP-chain queueing. */
195 void *function; /* originating ERP action */
196
197 /* these are for statistics only */
198 unsigned long long buildclk; /* TOD-clock of request generation */
199 unsigned long long startclk; /* TOD-clock of request start */
200 unsigned long long stopclk; /* TOD-clock of request interrupt */
201 unsigned long long endclk; /* TOD-clock of request termination */
202
203 /* Callback that is called after reaching final status. */
8e09f215
SW		 204 void (*callback)(struct dasd_ccw_req *, void *data);
205 void *callback_data;
1da177e4
LT		 206};
207
138c014d 208/*
1da177e4
LT		 209 * dasd_ccw_req -> status can be:
210 */
8e09f215
SW		 211#define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
212#define DASD_CQR_DONE 0x01 /* request is completed successfully */
213#define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
214#define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
215#define DASD_CQR_FAILED 0x04 /* request is finally failed */
216#define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
217
218#define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
219#define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
220#define DASD_CQR_ERROR 0x82 /* request is completed with error */
221#define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
222#define DASD_CQR_CLEARED 0x84 /* request was cleared */
73ac36ea 223#define DASD_CQR_SUCCESS 0x85 /* request was successful */
8e09f215 224
7c8faa86
SH		 225/* default expiration time*/
226#define DASD_EXPIRES 300
227#define DASD_EXPIRES_MAX 40000000
1f1ee9ad
HR		 228#define DASD_RETRIES 256
229#define DASD_RETRIES_MAX 32768
1da177e4
LT		 230
231/* per dasd_ccw_req flags */
232#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
1c01b8a5 233#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
a4d26c6a 234#define DASD_CQR_VERIFY_PATH 2 /* path verification request */
5a27e60d
SW		 235#define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was
236 * stolen. Should not be combined with
237 * DASD_CQR_FLAGS_USE_ERP
238 */
8fd57520
JH		 239/*
240 * The following flags are used to suppress output of certain errors.
241 * These flags should only be used for format checks!
242 */
243#define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */
244#define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/
245#define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */
1da177e4
LT		 246
247/* Signature for error recovery functions. */
248typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
249
46d1c03c
JH		 250/*
251 * A single CQR can only contain a maximum of 255 CCWs. It is limited by
252 * the locate record and locate record extended count value which can only hold
253 * 1 Byte max.
254 */
255#define DASD_CQR_MAX_CCW 255
256
2dedf0d9
SH		 257/*
258 * Unique identifier for dasd device.
259 */
260#define UA_NOT_CONFIGURED 0x00
261#define UA_BASE_DEVICE 0x01
262#define UA_BASE_PAV_ALIAS 0x02
263#define UA_HYPER_PAV_ALIAS 0x03
264
265struct dasd_uid {
266 __u8 type;
267 char vendor[4];
268 char serial[15];
269 __u16 ssid;
270 __u8 real_unit_addr;
271 __u8 base_unit_addr;
272 char vduit[33];
273};
274
1da177e4
LT		 275/*
276 * the struct dasd_discipline is
277 * sth like a table of virtual functions, if you think of dasd_eckd
278 * inheriting dasd...
279 * no, currently we are not planning to reimplement the driver in C++
280 */
281struct dasd_discipline {
282 struct module *owner;
283 char ebcname[8]; /* a name used for tagging and printks */
284 char name[8]; /* a name used for tagging and printks */
285 int max_blocks; /* maximum number of blocks to be chained */
286
287 struct list_head list; /* used for list of disciplines */
288
8e09f215
SW		 289 /*
290 * Device recognition functions. check_device is used to verify
291 * the sense data and the information returned by read device
292 * characteristics. It returns 0 if the discipline can be used
293 * for the device in question. uncheck_device is called during
294 * device shutdown to deregister a device from its discipline.
295 */
296 int (*check_device) (struct dasd_device *);
297 void (*uncheck_device) (struct dasd_device *);
298
299 /*
300 * do_analysis is used in the step from device state "basic" to
301 * state "accept". It returns 0 if the device can be made ready,
302 * it returns -EMEDIUMTYPE if the device can't be made ready or
303 * -EAGAIN if do_analysis started a ccw that needs to complete
304 * before the analysis may be repeated.
305 */
306 int (*do_analysis) (struct dasd_block *);
307
a4d26c6a
SW		 308 /*
309 * This function is called, when new paths become available.
310 * Disciplins may use this callback to do necessary setup work,
311 * e.g. verify that new path is compatible with the current
312 * configuration.
313 */
314 int (*verify_path)(struct dasd_device *, __u8);
315
8e09f215
SW		 316 /*
317 * Last things to do when a device is set online, and first things
318 * when it is set offline.
319 */
d42e1712 320 int (*basic_to_ready) (struct dasd_device *);
8e09f215 321 int (*online_to_ready) (struct dasd_device *);
daa991bf 322 int (*basic_to_known)(struct dasd_device *);
8e09f215 323
d42e1712 324 /* (struct dasd_device *);
8e09f215
SW		 325 * Device operation functions. build_cp creates a ccw chain for
326 * a block device request, start_io starts the request and
327 * term_IO cancels it (e.g. in case of a timeout). format_device
8fd57520
JH		 328 * formats the device and check_device_format compares the format of
329 * a device with the expected format_data.
8e09f215
SW		 330 * handle_terminated_request allows to examine a cqr and prepare
331 * it for retry.
332 */
1da177e4 333 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
8e09f215 334 struct dasd_block *,
1da177e4
LT		 335 struct request *);
336 int (*start_IO) (struct dasd_ccw_req *);
337 int (*term_IO) (struct dasd_ccw_req *);
8e09f215 338 void (*handle_terminated_request) (struct dasd_ccw_req *);
d42e1712 339 int (*format_device) (struct dasd_device *,
8fd57520
JH		 340 struct format_data_t *, int);
341 int (*check_device_format)(struct dasd_device *,
342 struct format_check_t *, int);
1da177e4 343 int (*free_cp) (struct dasd_ccw_req *, struct request *);
8e09f215
SW		 344
345 /*
346 * Error recovery functions. examine_error() returns a value that
347 * indicates what to do for an error condition. If examine_error()
138c014d 348 * returns 'dasd_era_recover' erp_action() is called to create a
8e09f215
SW		 349 * special error recovery ccw. erp_postaction() is called after
350 * an error recovery ccw has finished its execution. dump_sense
351 * is called for every error condition to print the sense data
352 * to the console.
353 */
1da177e4
LT		 354 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
355 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
356 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
357 struct irb *);
aeec92ca 358 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
5a27e60d
SW		 359 void (*check_for_device_change) (struct dasd_device *,
360 struct dasd_ccw_req *,
361 struct irb *);
8e09f215 362
1da177e4 363 /* i/o control functions. */
8e09f215 364 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
1da177e4 365 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
8e09f215 366 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
d41dd122
SH		 367
368 /* suspend/resume functions */
369 int (*freeze) (struct dasd_device *);
370 int (*restore) (struct dasd_device *);
501183f2
SH		 371
372 /* reload device after state change */
373 int (*reload) (struct dasd_device *);
2dedf0d9
SH		 374
375 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
f1633031 376 void (*kick_validate) (struct dasd_device *);
5db8440c 377 int (*check_attention)(struct dasd_device *, __u8);
5a3b7b11
SH		 378 int (*host_access_count)(struct dasd_device *);
379 int (*hosts_print)(struct dasd_device *, struct seq_file *);
1da177e4
LT		 380};
381
382extern struct dasd_discipline *dasd_diag_discipline_pointer;
383
20c64468
SW		 384/*
385 * Notification numbers for extended error reporting notifications:
386 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
387 * eer pointer) is freed. The error reporting module needs to do all necessary
388 * cleanup steps.
389 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
390 */
391#define DASD_EER_DISABLE 0
392#define DASD_EER_TRIGGER 1
393
394/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
395#define DASD_EER_FATALERROR 1
396#define DASD_EER_NOPATH 2
397#define DASD_EER_STATECHANGE 3
398#define DASD_EER_PPRCSUSPEND 4
399
a4d26c6a
SW		 400struct dasd_path {
401 __u8 opm;
402 __u8 tbvpm;
403 __u8 ppm;
404 __u8 npm;
5db8440c
SH		 405 /* paths that are not used because of a special condition */
406 __u8 cablepm; /* miss-cabled */
407 __u8 hpfpm; /* the HPF requirements of the other paths are not met */
408 __u8 cuirpm; /* CUIR varied offline */
a4d26c6a
SW		 409};
410
4fa52aa7
SW		 411struct dasd_profile_info {
412 /* legacy part of profile data, as in dasd_profile_info_t */
413 unsigned int dasd_io_reqs; /* number of requests processed */
414 unsigned int dasd_io_sects; /* number of sectors processed */
415 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
416 unsigned int dasd_io_times[32]; /* histogram of requests's times */
417 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */
418 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
419 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
420 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
421 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
422 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
423
424 /* new data */
425 struct timespec starttod; /* time of start or last reset */
426 unsigned int dasd_io_alias; /* requests using an alias */
427 unsigned int dasd_io_tpm; /* requests using transport mode */
428 unsigned int dasd_read_reqs; /* total number of read requests */
429 unsigned int dasd_read_sects; /* total number read sectors */
430 unsigned int dasd_read_alias; /* read request using an alias */
431 unsigned int dasd_read_tpm; /* read requests in transport mode */
432 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
433 unsigned int dasd_read_times[32]; /* histogram of requests's times */
434 unsigned int dasd_read_time1[32]; /* hist. time from build to start */
435 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
436 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
437 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
438};
439
440struct dasd_profile {
441 struct dentry *dentry;
442 struct dasd_profile_info *data;
443 spinlock_t lock;
444};
445
1da177e4
LT		 446struct dasd_device {
447 /* Block device stuff. */
8e09f215
SW		 448 struct dasd_block *block;
449
1da177e4 450 unsigned int devindex;
138c014d
HH		 451 unsigned long flags; /* per device flags */
452 unsigned short features; /* copy of devmap-features (read-only!) */
1da177e4 453
20c64468
SW		 454 /* extended error reporting stuff (eer) */
455 struct dasd_ccw_req *eer_cqr;
456
1da177e4
LT		 457 /* Device discipline stuff. */
458 struct dasd_discipline *discipline;
aa88861f 459 struct dasd_discipline *base_discipline;
543691a4 460 void *private;
a4d26c6a 461 struct dasd_path path_data;
1da177e4
LT		 462
463 /* Device state and target state. */
464 int state, target;
9eb25122 465 struct mutex state_mutex;
1da177e4
LT		 466 int stopped; /* device (ccw_device_start) was stopped */
467
8e09f215 468 /* reference count. */
1da177e4 469 atomic_t ref_count;
1da177e4
LT		 470
471 /* ccw queue and memory for static ccw/erp buffers. */
472 struct list_head ccw_queue;
473 spinlock_t mem_lock;
474 void *ccw_mem;
475 void *erp_mem;
476 struct list_head ccw_chunks;
477 struct list_head erp_chunks;
478
479 atomic_t tasklet_scheduled;
480 struct tasklet_struct tasklet;
481 struct work_struct kick_work;
d41dd122 482 struct work_struct restore_device;
501183f2 483 struct work_struct reload_device;
f1633031 484 struct work_struct kick_validate;
59a9ed5f 485 struct work_struct suc_work;
1da177e4
LT		 486 struct timer_list timer;
487
488 debug_info_t *debug_area;
489
490 struct ccw_device *cdev;
491
8e09f215
SW		 492 /* hook for alias management */
493 struct list_head alias_list;
7c8faa86
SH		 494
495 /* default expiration time in s */
496 unsigned long default_expires;
1f1ee9ad 497 unsigned long default_retries;
4fa52aa7 498
3d71ad32
HR		 499 unsigned long blk_timeout;
500
4fa52aa7 501 struct dentry *debugfs_dentry;
5a3b7b11 502 struct dentry *hosts_dentry;
4fa52aa7 503 struct dasd_profile profile;
8e09f215
SW		 504};
505
506struct dasd_block {
507 /* Block device stuff. */
508 struct gendisk *gdp;
509 struct request_queue *request_queue;
510 spinlock_t request_queue_lock;
511 struct block_device *bdev;
512 atomic_t open_count;
513
b44b0ab3 514 unsigned long long blocks; /* size of volume in blocks */
8e09f215
SW		 515 unsigned int bp_block; /* bytes per block */
516 unsigned int s2b_shift; /* log2 (bp_block/512) */
517
518 struct dasd_device *base;
519 struct list_head ccw_queue;
520 spinlock_t queue_lock;
521
522 atomic_t tasklet_scheduled;
523 struct tasklet_struct tasklet;
524 struct timer_list timer;
525
4fa52aa7
SW		 526 struct dentry *debugfs_dentry;
527 struct dasd_profile profile;
1da177e4
LT		 528};
529
5db8440c
SH		 530struct dasd_attention_data {
531 struct dasd_device *device;
532 __u8 lpum;
533};
8e09f215 534
1da177e4
LT		 535/* reasons why device (ccw_device_start) was stopped */
536#define DASD_STOPPED_NOT_ACC 1 /* not accessible */
537#define DASD_STOPPED_QUIESCE 2 /* Quiesced */
538#define DASD_STOPPED_PENDING 4 /* long busy */
539#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
8e09f215 540#define DASD_STOPPED_SU 16 /* summary unit check handling */
d41dd122
SH		 541#define DASD_STOPPED_PM 32 /* pm state transition */
542#define DASD_UNRESUMED_PM 64 /* pm resume failed state */
1da177e4
LT		 543
544/* per device flags */
1da177e4 545#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
20c64468
SW		 546#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
547#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
33b62a30
SW		 548#define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
549 * confuse this with the user specified
550 * read-only feature.
551 */
5a27e60d
SW		 552#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
553#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
c8d1c0ff 554#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
d07dc5d8
SH		 555#define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
556#define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
5ea34a01 557#define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
1eb38023 558#define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
59a9ed5f 559#define DASD_FLAG_SUC 14 /* unhandled summary unit check */
5a27e60d 560
5ea34a01
HR		 561#define DASD_SLEEPON_START_TAG ((void *) 1)
562#define DASD_SLEEPON_END_TAG ((void *) 2)
1da177e4
LT		 563
564void dasd_put_device_wake(struct dasd_device *);
565
566/*
567 * Reference count inliners
568 */
569static inline void
570dasd_get_device(struct dasd_device *device)
571{
572 atomic_inc(&device->ref_count);
573}
574
575static inline void
576dasd_put_device(struct dasd_device *device)
577{
578 if (atomic_dec_return(&device->ref_count) == 0)
579 dasd_put_device_wake(device);
580}
581
582/*
583 * The static memory in ccw_mem and erp_mem is managed by a sorted
584 * list of free memory chunks.
585 */
586struct dasd_mchunk
587{
588 struct list_head list;
589 unsigned long size;
590} __attribute__ ((aligned(8)));
591
592static inline void
593dasd_init_chunklist(struct list_head *chunk_list, void *mem,
594 unsigned long size)
595{
596 struct dasd_mchunk *chunk;
597
598 INIT_LIST_HEAD(chunk_list);
599 chunk = (struct dasd_mchunk *) mem;
600 chunk->size = size - sizeof(struct dasd_mchunk);
601 list_add(&chunk->list, chunk_list);
602}
603
604static inline void *
605dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
606{
607 struct dasd_mchunk *chunk, *tmp;
608
609 size = (size + 7L) & -8L;
610 list_for_each_entry(chunk, chunk_list, list) {
611 if (chunk->size < size)
612 continue;
613 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
614 char *endaddr = (char *) (chunk + 1) + chunk->size;
615 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
616 tmp->size = size;
617 chunk->size -= size + sizeof(struct dasd_mchunk);
618 chunk = tmp;
619 } else
620 list_del(&chunk->list);
621 return (void *) (chunk + 1);
622 }
623 return NULL;
624}
625
626static inline void
627dasd_free_chunk(struct list_head *chunk_list, void *mem)
628{
629 struct dasd_mchunk *chunk, *tmp;
630 struct list_head *p, *left;
631
632 chunk = (struct dasd_mchunk *)
633 ((char *) mem - sizeof(struct dasd_mchunk));
634 /* Find out the left neighbour in chunk_list. */
635 left = chunk_list;
636 list_for_each(p, chunk_list) {
637 if (list_entry(p, struct dasd_mchunk, list) > chunk)
638 break;
639 left = p;
640 }
641 /* Try to merge with right neighbour = next element from left. */
642 if (left->next != chunk_list) {
643 tmp = list_entry(left->next, struct dasd_mchunk, list);
644 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
645 list_del(&tmp->list);
646 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
647 }
648 }
649 /* Try to merge with left neighbour. */
650 if (left != chunk_list) {
651 tmp = list_entry(left, struct dasd_mchunk, list);
652 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
653 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
654 return;
655 }
656 }
657 __list_add(&chunk->list, left, left->next);
658}
659
660/*
661 * Check if bsize is in { 512, 1024, 2048, 4096 }
662 */
663static inline int
664dasd_check_blocksize(int bsize)
665{
e108cebb 666 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
1da177e4
LT		 667 return -EMEDIUMTYPE;
668 return 0;
669}
670
671/* externals in dasd.c */
4fa52aa7
SW		 672#define DASD_PROFILE_OFF 0
673#define DASD_PROFILE_ON 1
674#define DASD_PROFILE_GLOBAL_ONLY 2
1da177e4
LT		 675
676extern debug_info_t *dasd_debug_area;
8ea55c95 677extern struct dasd_profile dasd_global_profile;
4fa52aa7 678extern unsigned int dasd_global_profile_level;
83d5cde4 679extern const struct block_device_operations dasd_device_operations;
1da177e4 680
e18b890b 681extern struct kmem_cache *dasd_page_cache;
1da177e4
LT		 682
683struct dasd_ccw_req *
68b781fe 684dasd_kmalloc_request(int , int, int, struct dasd_device *);
1da177e4 685struct dasd_ccw_req *
68b781fe 686dasd_smalloc_request(int , int, int, struct dasd_device *);
1da177e4
LT		 687void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
688void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
5915a873 689void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
1da177e4
LT		 690
691static inline int
692dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
693{
694 return set_normalized_cda(ccw, cda);
695}
696
697struct dasd_device *dasd_alloc_device(void);
698void dasd_free_device(struct dasd_device *);
699
8e09f215
SW		 700struct dasd_block *dasd_alloc_block(void);
701void dasd_free_block(struct dasd_block *);
702
3d71ad32
HR		 703enum blk_eh_timer_return dasd_times_out(struct request *req);
704
1da177e4
LT		 705void dasd_enable_device(struct dasd_device *);
706void dasd_set_target_state(struct dasd_device *, int);
707void dasd_kick_device(struct dasd_device *);
d41dd122 708void dasd_restore_device(struct dasd_device *);
501183f2 709void dasd_reload_device(struct dasd_device *);
1da177e4
LT		 710
711void dasd_add_request_head(struct dasd_ccw_req *);
712void dasd_add_request_tail(struct dasd_ccw_req *);
713int dasd_start_IO(struct dasd_ccw_req *);
714int dasd_term_IO(struct dasd_ccw_req *);
8e09f215
SW		 715void dasd_schedule_device_bh(struct dasd_device *);
716void dasd_schedule_block_bh(struct dasd_block *);
1da177e4 717int dasd_sleep_on(struct dasd_ccw_req *);
d42e1712 718int dasd_sleep_on_queue(struct list_head *);
1da177e4
LT		 719int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
720int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
8e09f215
SW		 721void dasd_device_set_timer(struct dasd_device *, int);
722void dasd_device_clear_timer(struct dasd_device *);
723void dasd_block_set_timer(struct dasd_block *, int);
724void dasd_block_clear_timer(struct dasd_block *);
1da177e4 725int dasd_cancel_req(struct dasd_ccw_req *);
8e09f215 726int dasd_flush_device_queue(struct dasd_device *);
1da177e4
LT		 727int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
728void dasd_generic_remove (struct ccw_device *cdev);
729int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
730int dasd_generic_set_offline (struct ccw_device *cdev);
731int dasd_generic_notify(struct ccw_device *, int);
a4d26c6a
SW		 732int dasd_generic_last_path_gone(struct dasd_device *);
733int dasd_generic_path_operational(struct dasd_device *);
4679e893 734void dasd_generic_shutdown(struct ccw_device *);
a4d26c6a 735
8e09f215 736void dasd_generic_handle_state_change(struct dasd_device *);
d41dd122
SH		 737int dasd_generic_pm_freeze(struct ccw_device *);
738int dasd_generic_restore_device(struct ccw_device *);
a23ed009 739enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
a4d26c6a
SW		 740void dasd_generic_path_event(struct ccw_device *, int *);
741int dasd_generic_verify_path(struct dasd_device *, __u8);
1da177e4 742
68b781fe 743int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
f3eb5384 744char *dasd_get_sense(struct irb *);
17283b56 745
eb6e199b
SW		 746void dasd_device_set_stop_bits(struct dasd_device *, int);
747void dasd_device_remove_stop_bits(struct dasd_device *, int);
748
33b62a30
SW		 749int dasd_device_is_ro(struct dasd_device *);
750
4fa52aa7
SW		 751void dasd_profile_reset(struct dasd_profile *);
752int dasd_profile_on(struct dasd_profile *);
753void dasd_profile_off(struct dasd_profile *);
4fa52aa7 754char *dasd_get_user_string(const char __user *, size_t);
33b62a30 755
1da177e4
LT		 756/* externals in dasd_devmap.c */
757extern int dasd_max_devindex;
758extern int dasd_probeonly;
759extern int dasd_autodetect;
40545573 760extern int dasd_nopav;
f3eb5384 761extern int dasd_nofcx;
1da177e4
LT		 762
763int dasd_devmap_init(void);
764void dasd_devmap_exit(void);
765
766struct dasd_device *dasd_create_device(struct ccw_device *);
767void dasd_delete_device(struct dasd_device *);
768
f24acd45
HH		 769int dasd_get_feature(struct ccw_device *, int);
770int dasd_set_feature(struct ccw_device *, int, int);
771
1da177e4
LT		 772int dasd_add_sysfs_files(struct ccw_device *);
773void dasd_remove_sysfs_files(struct ccw_device *);
774
775struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
a00bfd71 776struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
1da177e4
LT		 777struct dasd_device *dasd_device_from_devindex(int);
778
65f8da47
SW		 779void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
780struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
781
1da177e4 782int dasd_parse(void);
69f90f6a 783int dasd_busid_known(const char *);
1da177e4
LT		 784
785/* externals in dasd_gendisk.c */
786int dasd_gendisk_init(void);
787void dasd_gendisk_exit(void);
8e09f215
SW		 788int dasd_gendisk_alloc(struct dasd_block *);
789void dasd_gendisk_free(struct dasd_block *);
790int dasd_scan_partitions(struct dasd_block *);
791void dasd_destroy_partitions(struct dasd_block *);
1da177e4
LT		 792
793/* externals in dasd_ioctl.c */
57a7c0bc 794int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
1da177e4
LT		 795
796/* externals in dasd_proc.c */
797int dasd_proc_init(void);
798void dasd_proc_exit(void);
799
800/* externals in dasd_erp.c */
801struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
802struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
803struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
804 struct dasd_device *);
805void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
806void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
fc19f381 807void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
1da177e4 808
1da177e4 809/* externals in dasd_3990_erp.c */
1da177e4 810struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
f60c768c 811void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
1da177e4 812
20c64468
SW		 813/* externals in dasd_eer.c */
814#ifdef CONFIG_DASD_EER
815int dasd_eer_init(void);
816void dasd_eer_exit(void);
817int dasd_eer_enable(struct dasd_device *);
818void dasd_eer_disable(struct dasd_device *);
819void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
820 unsigned int id);
821void dasd_eer_snss(struct dasd_device *);
822
823static inline int dasd_eer_enabled(struct dasd_device *device)
824{
825 return device->eer_cqr != NULL;
826}
827#else
828#define dasd_eer_init() (0)
829#define dasd_eer_exit() do { } while (0)
830#define dasd_eer_enable(d) (0)
831#define dasd_eer_disable(d) do { } while (0)
832#define dasd_eer_write(d,c,i) do { } while (0)
833#define dasd_eer_snss(d) do { } while (0)
834#define dasd_eer_enabled(d) (0)
835#endif /* CONFIG_DASD_ERR */
836
1da177e4 837#endif /* DASD_H */
Linux 6.x block layer and io_uring tree(s)