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[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 */
f3eb5384
SW		 178 void *cpaddr; /* address of ccw or tcw */
179 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
8e09f215 180 char status; /* status of this request */
1da177e4
LT		 181 short retries; /* A retry counter */
182 unsigned long flags; /* flags of this request */
183
184 /* ... and how */
185 unsigned long starttime; /* jiffies time of request start */
7c8faa86 186 unsigned long expires; /* expiration period in jiffies */
8e09f215 187 char lpm; /* logical path mask */
1da177e4
LT		 188 void *data; /* pointer to data area */
189
190 /* these are important for recovering erroneous requests */
6cc7f168 191 int intrc; /* internal error, e.g. from start_IO */
1da177e4
LT		 192 struct irb irb; /* device status in case of an error */
193 struct dasd_ccw_req *refers; /* ERP-chain queueing. */
194 void *function; /* originating ERP action */
195
196 /* these are for statistics only */
197 unsigned long long buildclk; /* TOD-clock of request generation */
198 unsigned long long startclk; /* TOD-clock of request start */
199 unsigned long long stopclk; /* TOD-clock of request interrupt */
200 unsigned long long endclk; /* TOD-clock of request termination */
201
202 /* Callback that is called after reaching final status. */
8e09f215
SW		 203 void (*callback)(struct dasd_ccw_req *, void *data);
204 void *callback_data;
1da177e4
LT		 205};
206
138c014d 207/*
1da177e4
LT		 208 * dasd_ccw_req -> status can be:
209 */
8e09f215
SW		 210#define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
211#define DASD_CQR_DONE 0x01 /* request is completed successfully */
212#define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
213#define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
214#define DASD_CQR_FAILED 0x04 /* request is finally failed */
215#define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
216
217#define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
218#define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
219#define DASD_CQR_ERROR 0x82 /* request is completed with error */
220#define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
221#define DASD_CQR_CLEARED 0x84 /* request was cleared */
73ac36ea 222#define DASD_CQR_SUCCESS 0x85 /* request was successful */
8e09f215 223
7c8faa86
SH		 224/* default expiration time*/
225#define DASD_EXPIRES 300
226#define DASD_EXPIRES_MAX 40000000
1da177e4
LT		 227
228/* per dasd_ccw_req flags */
229#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
1c01b8a5 230#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
a4d26c6a 231#define DASD_CQR_VERIFY_PATH 2 /* path verification request */
5a27e60d
SW		 232#define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was
233 * stolen. Should not be combined with
234 * DASD_CQR_FLAGS_USE_ERP
235 */
1da177e4
LT		 236
237/* Signature for error recovery functions. */
238typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
239
2dedf0d9
SH		 240/*
241 * Unique identifier for dasd device.
242 */
243#define UA_NOT_CONFIGURED 0x00
244#define UA_BASE_DEVICE 0x01
245#define UA_BASE_PAV_ALIAS 0x02
246#define UA_HYPER_PAV_ALIAS 0x03
247
248struct dasd_uid {
249 __u8 type;
250 char vendor[4];
251 char serial[15];
252 __u16 ssid;
253 __u8 real_unit_addr;
254 __u8 base_unit_addr;
255 char vduit[33];
256};
257
1da177e4
LT		 258/*
259 * the struct dasd_discipline is
260 * sth like a table of virtual functions, if you think of dasd_eckd
261 * inheriting dasd...
262 * no, currently we are not planning to reimplement the driver in C++
263 */
264struct dasd_discipline {
265 struct module *owner;
266 char ebcname[8]; /* a name used for tagging and printks */
267 char name[8]; /* a name used for tagging and printks */
268 int max_blocks; /* maximum number of blocks to be chained */
269
270 struct list_head list; /* used for list of disciplines */
271
8e09f215
SW		 272 /*
273 * Device recognition functions. check_device is used to verify
274 * the sense data and the information returned by read device
275 * characteristics. It returns 0 if the discipline can be used
276 * for the device in question. uncheck_device is called during
277 * device shutdown to deregister a device from its discipline.
278 */
279 int (*check_device) (struct dasd_device *);
280 void (*uncheck_device) (struct dasd_device *);
281
282 /*
283 * do_analysis is used in the step from device state "basic" to
284 * state "accept". It returns 0 if the device can be made ready,
285 * it returns -EMEDIUMTYPE if the device can't be made ready or
286 * -EAGAIN if do_analysis started a ccw that needs to complete
287 * before the analysis may be repeated.
288 */
289 int (*do_analysis) (struct dasd_block *);
290
a4d26c6a
SW		 291 /*
292 * This function is called, when new paths become available.
293 * Disciplins may use this callback to do necessary setup work,
294 * e.g. verify that new path is compatible with the current
295 * configuration.
296 */
297 int (*verify_path)(struct dasd_device *, __u8);
298
8e09f215
SW		 299 /*
300 * Last things to do when a device is set online, and first things
301 * when it is set offline.
302 */
303 int (*ready_to_online) (struct dasd_device *);
304 int (*online_to_ready) (struct dasd_device *);
305
306 /*
307 * Device operation functions. build_cp creates a ccw chain for
308 * a block device request, start_io starts the request and
309 * term_IO cancels it (e.g. in case of a timeout). format_device
310 * returns a ccw chain to be used to format the device.
311 * handle_terminated_request allows to examine a cqr and prepare
312 * it for retry.
313 */
1da177e4 314 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
8e09f215 315 struct dasd_block *,
1da177e4
LT		 316 struct request *);
317 int (*start_IO) (struct dasd_ccw_req *);
318 int (*term_IO) (struct dasd_ccw_req *);
8e09f215 319 void (*handle_terminated_request) (struct dasd_ccw_req *);
1da177e4
LT		 320 struct dasd_ccw_req *(*format_device) (struct dasd_device *,
321 struct format_data_t *);
322 int (*free_cp) (struct dasd_ccw_req *, struct request *);
8e09f215
SW		 323
324 /*
325 * Error recovery functions. examine_error() returns a value that
326 * indicates what to do for an error condition. If examine_error()
138c014d 327 * returns 'dasd_era_recover' erp_action() is called to create a
8e09f215
SW		 328 * special error recovery ccw. erp_postaction() is called after
329 * an error recovery ccw has finished its execution. dump_sense
330 * is called for every error condition to print the sense data
331 * to the console.
332 */
1da177e4
LT		 333 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
334 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
335 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
336 struct irb *);
aeec92ca 337 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
5a27e60d
SW		 338 void (*check_for_device_change) (struct dasd_device *,
339 struct dasd_ccw_req *,
340 struct irb *);
8e09f215 341
1da177e4 342 /* i/o control functions. */
8e09f215 343 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
1da177e4 344 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
8e09f215 345 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
d41dd122
SH		 346
347 /* suspend/resume functions */
348 int (*freeze) (struct dasd_device *);
349 int (*restore) (struct dasd_device *);
501183f2
SH		 350
351 /* reload device after state change */
352 int (*reload) (struct dasd_device *);
2dedf0d9
SH		 353
354 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
f1633031 355 void (*kick_validate) (struct dasd_device *);
1da177e4
LT		 356};
357
358extern struct dasd_discipline *dasd_diag_discipline_pointer;
359
20c64468
SW		 360/*
361 * Notification numbers for extended error reporting notifications:
362 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
363 * eer pointer) is freed. The error reporting module needs to do all necessary
364 * cleanup steps.
365 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
366 */
367#define DASD_EER_DISABLE 0
368#define DASD_EER_TRIGGER 1
369
370/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
371#define DASD_EER_FATALERROR 1
372#define DASD_EER_NOPATH 2
373#define DASD_EER_STATECHANGE 3
374#define DASD_EER_PPRCSUSPEND 4
375
a4d26c6a
SW		 376struct dasd_path {
377 __u8 opm;
378 __u8 tbvpm;
379 __u8 ppm;
380 __u8 npm;
381};
382
4fa52aa7
SW		 383struct dasd_profile_info {
384 /* legacy part of profile data, as in dasd_profile_info_t */
385 unsigned int dasd_io_reqs; /* number of requests processed */
386 unsigned int dasd_io_sects; /* number of sectors processed */
387 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
388 unsigned int dasd_io_times[32]; /* histogram of requests's times */
389 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */
390 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
391 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
392 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
393 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
394 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
395
396 /* new data */
397 struct timespec starttod; /* time of start or last reset */
398 unsigned int dasd_io_alias; /* requests using an alias */
399 unsigned int dasd_io_tpm; /* requests using transport mode */
400 unsigned int dasd_read_reqs; /* total number of read requests */
401 unsigned int dasd_read_sects; /* total number read sectors */
402 unsigned int dasd_read_alias; /* read request using an alias */
403 unsigned int dasd_read_tpm; /* read requests in transport mode */
404 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
405 unsigned int dasd_read_times[32]; /* histogram of requests's times */
406 unsigned int dasd_read_time1[32]; /* hist. time from build to start */
407 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
408 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
409 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
410};
411
412struct dasd_profile {
413 struct dentry *dentry;
414 struct dasd_profile_info *data;
415 spinlock_t lock;
416};
417
1da177e4
LT		 418struct dasd_device {
419 /* Block device stuff. */
8e09f215
SW		 420 struct dasd_block *block;
421
1da177e4 422 unsigned int devindex;
138c014d
HH		 423 unsigned long flags; /* per device flags */
424 unsigned short features; /* copy of devmap-features (read-only!) */
1da177e4 425
20c64468
SW		 426 /* extended error reporting stuff (eer) */
427 struct dasd_ccw_req *eer_cqr;
428
1da177e4
LT		 429 /* Device discipline stuff. */
430 struct dasd_discipline *discipline;
aa88861f 431 struct dasd_discipline *base_discipline;
1da177e4 432 char *private;
a4d26c6a 433 struct dasd_path path_data;
1da177e4
LT		 434
435 /* Device state and target state. */
436 int state, target;
9eb25122 437 struct mutex state_mutex;
1da177e4
LT		 438 int stopped; /* device (ccw_device_start) was stopped */
439
8e09f215 440 /* reference count. */
1da177e4 441 atomic_t ref_count;
1da177e4
LT		 442
443 /* ccw queue and memory for static ccw/erp buffers. */
444 struct list_head ccw_queue;
445 spinlock_t mem_lock;
446 void *ccw_mem;
447 void *erp_mem;
448 struct list_head ccw_chunks;
449 struct list_head erp_chunks;
450
451 atomic_t tasklet_scheduled;
452 struct tasklet_struct tasklet;
453 struct work_struct kick_work;
d41dd122 454 struct work_struct restore_device;
501183f2 455 struct work_struct reload_device;
f1633031 456 struct work_struct kick_validate;
1da177e4
LT		 457 struct timer_list timer;
458
459 debug_info_t *debug_area;
460
461 struct ccw_device *cdev;
462
8e09f215
SW		 463 /* hook for alias management */
464 struct list_head alias_list;
7c8faa86
SH		 465
466 /* default expiration time in s */
467 unsigned long default_expires;
4fa52aa7
SW		 468
469 struct dentry *debugfs_dentry;
470 struct dasd_profile profile;
8e09f215
SW		 471};
472
473struct dasd_block {
474 /* Block device stuff. */
475 struct gendisk *gdp;
476 struct request_queue *request_queue;
477 spinlock_t request_queue_lock;
478 struct block_device *bdev;
479 atomic_t open_count;
480
b44b0ab3 481 unsigned long long blocks; /* size of volume in blocks */
8e09f215
SW		 482 unsigned int bp_block; /* bytes per block */
483 unsigned int s2b_shift; /* log2 (bp_block/512) */
484
485 struct dasd_device *base;
486 struct list_head ccw_queue;
487 spinlock_t queue_lock;
488
489 atomic_t tasklet_scheduled;
490 struct tasklet_struct tasklet;
491 struct timer_list timer;
492
4fa52aa7
SW		 493 struct dentry *debugfs_dentry;
494 struct dasd_profile profile;
1da177e4
LT		 495};
496
8e09f215
SW		 497
498
1da177e4
LT		 499/* reasons why device (ccw_device_start) was stopped */
500#define DASD_STOPPED_NOT_ACC 1 /* not accessible */
501#define DASD_STOPPED_QUIESCE 2 /* Quiesced */
502#define DASD_STOPPED_PENDING 4 /* long busy */
503#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
8e09f215 504#define DASD_STOPPED_SU 16 /* summary unit check handling */
d41dd122
SH		 505#define DASD_STOPPED_PM 32 /* pm state transition */
506#define DASD_UNRESUMED_PM 64 /* pm resume failed state */
1da177e4
LT		 507
508/* per device flags */
1da177e4 509#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
20c64468
SW		 510#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
511#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
33b62a30
SW		 512#define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
513 * confuse this with the user specified
514 * read-only feature.
515 */
5a27e60d
SW		 516#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
517#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
c8d1c0ff 518#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
5a27e60d 519
1da177e4
LT		 520
521void dasd_put_device_wake(struct dasd_device *);
522
523/*
524 * Reference count inliners
525 */
526static inline void
527dasd_get_device(struct dasd_device *device)
528{
529 atomic_inc(&device->ref_count);
530}
531
532static inline void
533dasd_put_device(struct dasd_device *device)
534{
535 if (atomic_dec_return(&device->ref_count) == 0)
536 dasd_put_device_wake(device);
537}
538
539/*
540 * The static memory in ccw_mem and erp_mem is managed by a sorted
541 * list of free memory chunks.
542 */
543struct dasd_mchunk
544{
545 struct list_head list;
546 unsigned long size;
547} __attribute__ ((aligned(8)));
548
549static inline void
550dasd_init_chunklist(struct list_head *chunk_list, void *mem,
551 unsigned long size)
552{
553 struct dasd_mchunk *chunk;
554
555 INIT_LIST_HEAD(chunk_list);
556 chunk = (struct dasd_mchunk *) mem;
557 chunk->size = size - sizeof(struct dasd_mchunk);
558 list_add(&chunk->list, chunk_list);
559}
560
561static inline void *
562dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
563{
564 struct dasd_mchunk *chunk, *tmp;
565
566 size = (size + 7L) & -8L;
567 list_for_each_entry(chunk, chunk_list, list) {
568 if (chunk->size < size)
569 continue;
570 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
571 char *endaddr = (char *) (chunk + 1) + chunk->size;
572 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
573 tmp->size = size;
574 chunk->size -= size + sizeof(struct dasd_mchunk);
575 chunk = tmp;
576 } else
577 list_del(&chunk->list);
578 return (void *) (chunk + 1);
579 }
580 return NULL;
581}
582
583static inline void
584dasd_free_chunk(struct list_head *chunk_list, void *mem)
585{
586 struct dasd_mchunk *chunk, *tmp;
587 struct list_head *p, *left;
588
589 chunk = (struct dasd_mchunk *)
590 ((char *) mem - sizeof(struct dasd_mchunk));
591 /* Find out the left neighbour in chunk_list. */
592 left = chunk_list;
593 list_for_each(p, chunk_list) {
594 if (list_entry(p, struct dasd_mchunk, list) > chunk)
595 break;
596 left = p;
597 }
598 /* Try to merge with right neighbour = next element from left. */
599 if (left->next != chunk_list) {
600 tmp = list_entry(left->next, struct dasd_mchunk, list);
601 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
602 list_del(&tmp->list);
603 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
604 }
605 }
606 /* Try to merge with left neighbour. */
607 if (left != chunk_list) {
608 tmp = list_entry(left, struct dasd_mchunk, list);
609 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
610 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
611 return;
612 }
613 }
614 __list_add(&chunk->list, left, left->next);
615}
616
617/*
618 * Check if bsize is in { 512, 1024, 2048, 4096 }
619 */
620static inline int
621dasd_check_blocksize(int bsize)
622{
e108cebb 623 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
1da177e4
LT		 624 return -EMEDIUMTYPE;
625 return 0;
626}
627
628/* externals in dasd.c */
4fa52aa7
SW		 629#define DASD_PROFILE_OFF 0
630#define DASD_PROFILE_ON 1
631#define DASD_PROFILE_GLOBAL_ONLY 2
1da177e4
LT		 632
633extern debug_info_t *dasd_debug_area;
4fa52aa7
SW		 634extern struct dasd_profile_info dasd_global_profile_data;
635extern unsigned int dasd_global_profile_level;
83d5cde4 636extern const struct block_device_operations dasd_device_operations;
1da177e4 637
e18b890b 638extern struct kmem_cache *dasd_page_cache;
1da177e4
LT		 639
640struct dasd_ccw_req *
68b781fe 641dasd_kmalloc_request(int , int, int, struct dasd_device *);
1da177e4 642struct dasd_ccw_req *
68b781fe 643dasd_smalloc_request(int , int, int, struct dasd_device *);
1da177e4
LT		 644void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
645void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
5915a873 646void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
1da177e4
LT		 647
648static inline int
649dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
650{
651 return set_normalized_cda(ccw, cda);
652}
653
654struct dasd_device *dasd_alloc_device(void);
655void dasd_free_device(struct dasd_device *);
656
8e09f215
SW		 657struct dasd_block *dasd_alloc_block(void);
658void dasd_free_block(struct dasd_block *);
659
1da177e4
LT		 660void dasd_enable_device(struct dasd_device *);
661void dasd_set_target_state(struct dasd_device *, int);
662void dasd_kick_device(struct dasd_device *);
d41dd122 663void dasd_restore_device(struct dasd_device *);
501183f2 664void dasd_reload_device(struct dasd_device *);
1da177e4
LT		 665
666void dasd_add_request_head(struct dasd_ccw_req *);
667void dasd_add_request_tail(struct dasd_ccw_req *);
668int dasd_start_IO(struct dasd_ccw_req *);
669int dasd_term_IO(struct dasd_ccw_req *);
8e09f215
SW		 670void dasd_schedule_device_bh(struct dasd_device *);
671void dasd_schedule_block_bh(struct dasd_block *);
1da177e4
LT		 672int dasd_sleep_on(struct dasd_ccw_req *);
673int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
674int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
8e09f215
SW		 675void dasd_device_set_timer(struct dasd_device *, int);
676void dasd_device_clear_timer(struct dasd_device *);
677void dasd_block_set_timer(struct dasd_block *, int);
678void dasd_block_clear_timer(struct dasd_block *);
1da177e4 679int dasd_cancel_req(struct dasd_ccw_req *);
8e09f215 680int dasd_flush_device_queue(struct dasd_device *);
1da177e4
LT		 681int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
682void dasd_generic_remove (struct ccw_device *cdev);
683int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
684int dasd_generic_set_offline (struct ccw_device *cdev);
685int dasd_generic_notify(struct ccw_device *, int);
a4d26c6a
SW		 686int dasd_generic_last_path_gone(struct dasd_device *);
687int dasd_generic_path_operational(struct dasd_device *);
4679e893 688void dasd_generic_shutdown(struct ccw_device *);
a4d26c6a 689
8e09f215 690void dasd_generic_handle_state_change(struct dasd_device *);
d41dd122
SH		 691int dasd_generic_pm_freeze(struct ccw_device *);
692int dasd_generic_restore_device(struct ccw_device *);
a23ed009 693enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
a4d26c6a
SW		 694void dasd_generic_path_event(struct ccw_device *, int *);
695int dasd_generic_verify_path(struct dasd_device *, __u8);
1da177e4 696
68b781fe 697int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
f3eb5384 698char *dasd_get_sense(struct irb *);
17283b56 699
eb6e199b
SW		 700void dasd_device_set_stop_bits(struct dasd_device *, int);
701void dasd_device_remove_stop_bits(struct dasd_device *, int);
702
33b62a30
SW		 703int dasd_device_is_ro(struct dasd_device *);
704
4fa52aa7
SW		 705void dasd_profile_reset(struct dasd_profile *);
706int dasd_profile_on(struct dasd_profile *);
707void dasd_profile_off(struct dasd_profile *);
708void dasd_global_profile_reset(void);
709char *dasd_get_user_string(const char __user *, size_t);
33b62a30 710
1da177e4
LT		 711/* externals in dasd_devmap.c */
712extern int dasd_max_devindex;
713extern int dasd_probeonly;
714extern int dasd_autodetect;
40545573 715extern int dasd_nopav;
f3eb5384 716extern int dasd_nofcx;
1da177e4
LT		 717
718int dasd_devmap_init(void);
719void dasd_devmap_exit(void);
720
721struct dasd_device *dasd_create_device(struct ccw_device *);
722void dasd_delete_device(struct dasd_device *);
723
f24acd45
HH		 724int dasd_get_feature(struct ccw_device *, int);
725int dasd_set_feature(struct ccw_device *, int, int);
726
1da177e4
LT		 727int dasd_add_sysfs_files(struct ccw_device *);
728void dasd_remove_sysfs_files(struct ccw_device *);
729
730struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
a00bfd71 731struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
1da177e4
LT		 732struct dasd_device *dasd_device_from_devindex(int);
733
65f8da47
SW		 734void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
735struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
736
1da177e4 737int dasd_parse(void);
69f90f6a 738int dasd_busid_known(const char *);
1da177e4
LT		 739
740/* externals in dasd_gendisk.c */
741int dasd_gendisk_init(void);
742void dasd_gendisk_exit(void);
8e09f215
SW		 743int dasd_gendisk_alloc(struct dasd_block *);
744void dasd_gendisk_free(struct dasd_block *);
745int dasd_scan_partitions(struct dasd_block *);
746void dasd_destroy_partitions(struct dasd_block *);
1da177e4
LT		 747
748/* externals in dasd_ioctl.c */
57a7c0bc 749int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
1da177e4
LT		 750
751/* externals in dasd_proc.c */
752int dasd_proc_init(void);
753void dasd_proc_exit(void);
754
755/* externals in dasd_erp.c */
756struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
757struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
758struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
759 struct dasd_device *);
760void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
761void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
fc19f381 762void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
1da177e4 763
1da177e4 764/* externals in dasd_3990_erp.c */
1da177e4 765struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
f60c768c 766void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
1da177e4 767
20c64468
SW		 768/* externals in dasd_eer.c */
769#ifdef CONFIG_DASD_EER
770int dasd_eer_init(void);
771void dasd_eer_exit(void);
772int dasd_eer_enable(struct dasd_device *);
773void dasd_eer_disable(struct dasd_device *);
774void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
775 unsigned int id);
776void dasd_eer_snss(struct dasd_device *);
777
778static inline int dasd_eer_enabled(struct dasd_device *device)
779{
780 return device->eer_cqr != NULL;
781}
782#else
783#define dasd_eer_init() (0)
784#define dasd_eer_exit() do { } while (0)
785#define dasd_eer_enable(d) (0)
786#define dasd_eer_disable(d) do { } while (0)
787#define dasd_eer_write(d,c,i) do { } while (0)
788#define dasd_eer_snss(d) do { } while (0)
789#define dasd_eer_enabled(d) (0)
790#endif /* CONFIG_DASD_ERR */
791
1da177e4 792#endif /* DASD_H */
Linux 6.x block layer and io_uring tree(s)