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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[deliverable/linux.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 */
1da177e4
LT		 239
240/* Signature for error recovery functions. */
241typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
242
2dedf0d9
SH		 243/*
244 * Unique identifier for dasd device.
245 */
246#define UA_NOT_CONFIGURED 0x00
247#define UA_BASE_DEVICE 0x01
248#define UA_BASE_PAV_ALIAS 0x02
249#define UA_HYPER_PAV_ALIAS 0x03
250
251struct dasd_uid {
252 __u8 type;
253 char vendor[4];
254 char serial[15];
255 __u16 ssid;
256 __u8 real_unit_addr;
257 __u8 base_unit_addr;
258 char vduit[33];
259};
260
1da177e4
LT		 261/*
262 * the struct dasd_discipline is
263 * sth like a table of virtual functions, if you think of dasd_eckd
264 * inheriting dasd...
265 * no, currently we are not planning to reimplement the driver in C++
266 */
267struct dasd_discipline {
268 struct module *owner;
269 char ebcname[8]; /* a name used for tagging and printks */
270 char name[8]; /* a name used for tagging and printks */
271 int max_blocks; /* maximum number of blocks to be chained */
272
273 struct list_head list; /* used for list of disciplines */
274
8e09f215
SW		 275 /*
276 * Device recognition functions. check_device is used to verify
277 * the sense data and the information returned by read device
278 * characteristics. It returns 0 if the discipline can be used
279 * for the device in question. uncheck_device is called during
280 * device shutdown to deregister a device from its discipline.
281 */
282 int (*check_device) (struct dasd_device *);
283 void (*uncheck_device) (struct dasd_device *);
284
285 /*
286 * do_analysis is used in the step from device state "basic" to
287 * state "accept". It returns 0 if the device can be made ready,
288 * it returns -EMEDIUMTYPE if the device can't be made ready or
289 * -EAGAIN if do_analysis started a ccw that needs to complete
290 * before the analysis may be repeated.
291 */
292 int (*do_analysis) (struct dasd_block *);
293
a4d26c6a
SW		 294 /*
295 * This function is called, when new paths become available.
296 * Disciplins may use this callback to do necessary setup work,
297 * e.g. verify that new path is compatible with the current
298 * configuration.
299 */
300 int (*verify_path)(struct dasd_device *, __u8);
301
8e09f215
SW		 302 /*
303 * Last things to do when a device is set online, and first things
304 * when it is set offline.
305 */
d42e1712 306 int (*basic_to_ready) (struct dasd_device *);
8e09f215 307 int (*online_to_ready) (struct dasd_device *);
daa991bf 308 int (*basic_to_known)(struct dasd_device *);
8e09f215 309
d42e1712 310 /* (struct dasd_device *);
8e09f215
SW		 311 * Device operation functions. build_cp creates a ccw chain for
312 * a block device request, start_io starts the request and
313 * term_IO cancels it (e.g. in case of a timeout). format_device
314 * returns a ccw chain to be used to format the device.
315 * handle_terminated_request allows to examine a cqr and prepare
316 * it for retry.
317 */
1da177e4 318 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
8e09f215 319 struct dasd_block *,
1da177e4
LT		 320 struct request *);
321 int (*start_IO) (struct dasd_ccw_req *);
322 int (*term_IO) (struct dasd_ccw_req *);
8e09f215 323 void (*handle_terminated_request) (struct dasd_ccw_req *);
d42e1712 324 int (*format_device) (struct dasd_device *,
a94fa154 325 struct format_data_t *, int enable_pav);
1da177e4 326 int (*free_cp) (struct dasd_ccw_req *, struct request *);
8e09f215
SW		 327
328 /*
329 * Error recovery functions. examine_error() returns a value that
330 * indicates what to do for an error condition. If examine_error()
138c014d 331 * returns 'dasd_era_recover' erp_action() is called to create a
8e09f215
SW		 332 * special error recovery ccw. erp_postaction() is called after
333 * an error recovery ccw has finished its execution. dump_sense
334 * is called for every error condition to print the sense data
335 * to the console.
336 */
1da177e4
LT		 337 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
338 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
339 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
340 struct irb *);
aeec92ca 341 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
5a27e60d
SW		 342 void (*check_for_device_change) (struct dasd_device *,
343 struct dasd_ccw_req *,
344 struct irb *);
8e09f215 345
1da177e4 346 /* i/o control functions. */
8e09f215 347 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
1da177e4 348 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
8e09f215 349 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
d41dd122
SH		 350
351 /* suspend/resume functions */
352 int (*freeze) (struct dasd_device *);
353 int (*restore) (struct dasd_device *);
501183f2
SH		 354
355 /* reload device after state change */
356 int (*reload) (struct dasd_device *);
2dedf0d9
SH		 357
358 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
f1633031 359 void (*kick_validate) (struct dasd_device *);
5db8440c 360 int (*check_attention)(struct dasd_device *, __u8);
1da177e4
LT		 361};
362
363extern struct dasd_discipline *dasd_diag_discipline_pointer;
364
20c64468
SW		 365/*
366 * Notification numbers for extended error reporting notifications:
367 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
368 * eer pointer) is freed. The error reporting module needs to do all necessary
369 * cleanup steps.
370 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
371 */
372#define DASD_EER_DISABLE 0
373#define DASD_EER_TRIGGER 1
374
375/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
376#define DASD_EER_FATALERROR 1
377#define DASD_EER_NOPATH 2
378#define DASD_EER_STATECHANGE 3
379#define DASD_EER_PPRCSUSPEND 4
380
a4d26c6a
SW		 381struct dasd_path {
382 __u8 opm;
383 __u8 tbvpm;
384 __u8 ppm;
385 __u8 npm;
5db8440c
SH		 386 /* paths that are not used because of a special condition */
387 __u8 cablepm; /* miss-cabled */
388 __u8 hpfpm; /* the HPF requirements of the other paths are not met */
389 __u8 cuirpm; /* CUIR varied offline */
a4d26c6a
SW		 390};
391
4fa52aa7
SW		 392struct dasd_profile_info {
393 /* legacy part of profile data, as in dasd_profile_info_t */
394 unsigned int dasd_io_reqs; /* number of requests processed */
395 unsigned int dasd_io_sects; /* number of sectors processed */
396 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
397 unsigned int dasd_io_times[32]; /* histogram of requests's times */
398 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */
399 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
400 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
401 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
402 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
403 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
404
405 /* new data */
406 struct timespec starttod; /* time of start or last reset */
407 unsigned int dasd_io_alias; /* requests using an alias */
408 unsigned int dasd_io_tpm; /* requests using transport mode */
409 unsigned int dasd_read_reqs; /* total number of read requests */
410 unsigned int dasd_read_sects; /* total number read sectors */
411 unsigned int dasd_read_alias; /* read request using an alias */
412 unsigned int dasd_read_tpm; /* read requests in transport mode */
413 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
414 unsigned int dasd_read_times[32]; /* histogram of requests's times */
415 unsigned int dasd_read_time1[32]; /* hist. time from build to start */
416 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
417 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
418 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
419};
420
421struct dasd_profile {
422 struct dentry *dentry;
423 struct dasd_profile_info *data;
424 spinlock_t lock;
425};
426
1da177e4
LT		 427struct dasd_device {
428 /* Block device stuff. */
8e09f215
SW		 429 struct dasd_block *block;
430
1da177e4 431 unsigned int devindex;
138c014d
HH		 432 unsigned long flags; /* per device flags */
433 unsigned short features; /* copy of devmap-features (read-only!) */
1da177e4 434
20c64468
SW		 435 /* extended error reporting stuff (eer) */
436 struct dasd_ccw_req *eer_cqr;
437
1da177e4
LT		 438 /* Device discipline stuff. */
439 struct dasd_discipline *discipline;
aa88861f 440 struct dasd_discipline *base_discipline;
1da177e4 441 char *private;
a4d26c6a 442 struct dasd_path path_data;
1da177e4
LT		 443
444 /* Device state and target state. */
445 int state, target;
9eb25122 446 struct mutex state_mutex;
1da177e4
LT		 447 int stopped; /* device (ccw_device_start) was stopped */
448
8e09f215 449 /* reference count. */
1da177e4 450 atomic_t ref_count;
1da177e4
LT		 451
452 /* ccw queue and memory for static ccw/erp buffers. */
453 struct list_head ccw_queue;
454 spinlock_t mem_lock;
455 void *ccw_mem;
456 void *erp_mem;
457 struct list_head ccw_chunks;
458 struct list_head erp_chunks;
459
460 atomic_t tasklet_scheduled;
461 struct tasklet_struct tasklet;
462 struct work_struct kick_work;
d41dd122 463 struct work_struct restore_device;
501183f2 464 struct work_struct reload_device;
f1633031 465 struct work_struct kick_validate;
1da177e4
LT		 466 struct timer_list timer;
467
468 debug_info_t *debug_area;
469
470 struct ccw_device *cdev;
471
8e09f215
SW		 472 /* hook for alias management */
473 struct list_head alias_list;
7c8faa86
SH		 474
475 /* default expiration time in s */
476 unsigned long default_expires;
1f1ee9ad 477 unsigned long default_retries;
4fa52aa7 478
3d71ad32
HR		 479 unsigned long blk_timeout;
480
4fa52aa7
SW		 481 struct dentry *debugfs_dentry;
482 struct dasd_profile profile;
8e09f215
SW		 483};
484
485struct dasd_block {
486 /* Block device stuff. */
487 struct gendisk *gdp;
488 struct request_queue *request_queue;
489 spinlock_t request_queue_lock;
490 struct block_device *bdev;
491 atomic_t open_count;
492
b44b0ab3 493 unsigned long long blocks; /* size of volume in blocks */
8e09f215
SW		 494 unsigned int bp_block; /* bytes per block */
495 unsigned int s2b_shift; /* log2 (bp_block/512) */
496
497 struct dasd_device *base;
498 struct list_head ccw_queue;
499 spinlock_t queue_lock;
500
501 atomic_t tasklet_scheduled;
502 struct tasklet_struct tasklet;
503 struct timer_list timer;
504
4fa52aa7
SW		 505 struct dentry *debugfs_dentry;
506 struct dasd_profile profile;
1da177e4
LT		 507};
508
5db8440c
SH		 509struct dasd_attention_data {
510 struct dasd_device *device;
511 __u8 lpum;
512};
8e09f215 513
1da177e4
LT		 514/* reasons why device (ccw_device_start) was stopped */
515#define DASD_STOPPED_NOT_ACC 1 /* not accessible */
516#define DASD_STOPPED_QUIESCE 2 /* Quiesced */
517#define DASD_STOPPED_PENDING 4 /* long busy */
518#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
8e09f215 519#define DASD_STOPPED_SU 16 /* summary unit check handling */
d41dd122
SH		 520#define DASD_STOPPED_PM 32 /* pm state transition */
521#define DASD_UNRESUMED_PM 64 /* pm resume failed state */
1da177e4
LT		 522
523/* per device flags */
1da177e4 524#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
20c64468
SW		 525#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
526#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
33b62a30
SW		 527#define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
528 * confuse this with the user specified
529 * read-only feature.
530 */
5a27e60d
SW		 531#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
532#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
c8d1c0ff 533#define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
d07dc5d8
SH		 534#define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
535#define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
5ea34a01 536#define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
1eb38023 537#define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
5a27e60d 538
5ea34a01
HR		 539#define DASD_SLEEPON_START_TAG ((void *) 1)
540#define DASD_SLEEPON_END_TAG ((void *) 2)
1da177e4
LT		 541
542void dasd_put_device_wake(struct dasd_device *);
543
544/*
545 * Reference count inliners
546 */
547static inline void
548dasd_get_device(struct dasd_device *device)
549{
550 atomic_inc(&device->ref_count);
551}
552
553static inline void
554dasd_put_device(struct dasd_device *device)
555{
556 if (atomic_dec_return(&device->ref_count) == 0)
557 dasd_put_device_wake(device);
558}
559
560/*
561 * The static memory in ccw_mem and erp_mem is managed by a sorted
562 * list of free memory chunks.
563 */
564struct dasd_mchunk
565{
566 struct list_head list;
567 unsigned long size;
568} __attribute__ ((aligned(8)));
569
570static inline void
571dasd_init_chunklist(struct list_head *chunk_list, void *mem,
572 unsigned long size)
573{
574 struct dasd_mchunk *chunk;
575
576 INIT_LIST_HEAD(chunk_list);
577 chunk = (struct dasd_mchunk *) mem;
578 chunk->size = size - sizeof(struct dasd_mchunk);
579 list_add(&chunk->list, chunk_list);
580}
581
582static inline void *
583dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
584{
585 struct dasd_mchunk *chunk, *tmp;
586
587 size = (size + 7L) & -8L;
588 list_for_each_entry(chunk, chunk_list, list) {
589 if (chunk->size < size)
590 continue;
591 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
592 char *endaddr = (char *) (chunk + 1) + chunk->size;
593 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
594 tmp->size = size;
595 chunk->size -= size + sizeof(struct dasd_mchunk);
596 chunk = tmp;
597 } else
598 list_del(&chunk->list);
599 return (void *) (chunk + 1);
600 }
601 return NULL;
602}
603
604static inline void
605dasd_free_chunk(struct list_head *chunk_list, void *mem)
606{
607 struct dasd_mchunk *chunk, *tmp;
608 struct list_head *p, *left;
609
610 chunk = (struct dasd_mchunk *)
611 ((char *) mem - sizeof(struct dasd_mchunk));
612 /* Find out the left neighbour in chunk_list. */
613 left = chunk_list;
614 list_for_each(p, chunk_list) {
615 if (list_entry(p, struct dasd_mchunk, list) > chunk)
616 break;
617 left = p;
618 }
619 /* Try to merge with right neighbour = next element from left. */
620 if (left->next != chunk_list) {
621 tmp = list_entry(left->next, struct dasd_mchunk, list);
622 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
623 list_del(&tmp->list);
624 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
625 }
626 }
627 /* Try to merge with left neighbour. */
628 if (left != chunk_list) {
629 tmp = list_entry(left, struct dasd_mchunk, list);
630 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
631 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
632 return;
633 }
634 }
635 __list_add(&chunk->list, left, left->next);
636}
637
638/*
639 * Check if bsize is in { 512, 1024, 2048, 4096 }
640 */
641static inline int
642dasd_check_blocksize(int bsize)
643{
e108cebb 644 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
1da177e4
LT		 645 return -EMEDIUMTYPE;
646 return 0;
647}
648
649/* externals in dasd.c */
4fa52aa7
SW		 650#define DASD_PROFILE_OFF 0
651#define DASD_PROFILE_ON 1
652#define DASD_PROFILE_GLOBAL_ONLY 2
1da177e4
LT		 653
654extern debug_info_t *dasd_debug_area;
8ea55c95 655extern struct dasd_profile dasd_global_profile;
4fa52aa7 656extern unsigned int dasd_global_profile_level;
83d5cde4 657extern const struct block_device_operations dasd_device_operations;
1da177e4 658
e18b890b 659extern struct kmem_cache *dasd_page_cache;
1da177e4
LT		 660
661struct dasd_ccw_req *
68b781fe 662dasd_kmalloc_request(int , int, int, struct dasd_device *);
1da177e4 663struct dasd_ccw_req *
68b781fe 664dasd_smalloc_request(int , int, int, struct dasd_device *);
1da177e4
LT		 665void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
666void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
5915a873 667void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
1da177e4
LT		 668
669static inline int
670dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
671{
672 return set_normalized_cda(ccw, cda);
673}
674
675struct dasd_device *dasd_alloc_device(void);
676void dasd_free_device(struct dasd_device *);
677
8e09f215
SW		 678struct dasd_block *dasd_alloc_block(void);
679void dasd_free_block(struct dasd_block *);
680
3d71ad32
HR		 681enum blk_eh_timer_return dasd_times_out(struct request *req);
682
1da177e4
LT		 683void dasd_enable_device(struct dasd_device *);
684void dasd_set_target_state(struct dasd_device *, int);
685void dasd_kick_device(struct dasd_device *);
d41dd122 686void dasd_restore_device(struct dasd_device *);
501183f2 687void dasd_reload_device(struct dasd_device *);
1da177e4
LT		 688
689void dasd_add_request_head(struct dasd_ccw_req *);
690void dasd_add_request_tail(struct dasd_ccw_req *);
691int dasd_start_IO(struct dasd_ccw_req *);
692int dasd_term_IO(struct dasd_ccw_req *);
8e09f215
SW		 693void dasd_schedule_device_bh(struct dasd_device *);
694void dasd_schedule_block_bh(struct dasd_block *);
1da177e4 695int dasd_sleep_on(struct dasd_ccw_req *);
d42e1712 696int dasd_sleep_on_queue(struct list_head *);
1da177e4
LT		 697int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
698int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
8e09f215
SW		 699void dasd_device_set_timer(struct dasd_device *, int);
700void dasd_device_clear_timer(struct dasd_device *);
701void dasd_block_set_timer(struct dasd_block *, int);
702void dasd_block_clear_timer(struct dasd_block *);
1da177e4 703int dasd_cancel_req(struct dasd_ccw_req *);
8e09f215 704int dasd_flush_device_queue(struct dasd_device *);
1da177e4
LT		 705int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
706void dasd_generic_remove (struct ccw_device *cdev);
707int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
708int dasd_generic_set_offline (struct ccw_device *cdev);
709int dasd_generic_notify(struct ccw_device *, int);
a4d26c6a
SW		 710int dasd_generic_last_path_gone(struct dasd_device *);
711int dasd_generic_path_operational(struct dasd_device *);
4679e893 712void dasd_generic_shutdown(struct ccw_device *);
a4d26c6a 713
8e09f215 714void dasd_generic_handle_state_change(struct dasd_device *);
d41dd122
SH		 715int dasd_generic_pm_freeze(struct ccw_device *);
716int dasd_generic_restore_device(struct ccw_device *);
a23ed009 717enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
a4d26c6a
SW		 718void dasd_generic_path_event(struct ccw_device *, int *);
719int dasd_generic_verify_path(struct dasd_device *, __u8);
1da177e4 720
68b781fe 721int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
f3eb5384 722char *dasd_get_sense(struct irb *);
17283b56 723
eb6e199b
SW		 724void dasd_device_set_stop_bits(struct dasd_device *, int);
725void dasd_device_remove_stop_bits(struct dasd_device *, int);
726
33b62a30
SW		 727int dasd_device_is_ro(struct dasd_device *);
728
4fa52aa7
SW		 729void dasd_profile_reset(struct dasd_profile *);
730int dasd_profile_on(struct dasd_profile *);
731void dasd_profile_off(struct dasd_profile *);
4fa52aa7 732char *dasd_get_user_string(const char __user *, size_t);
33b62a30 733
1da177e4
LT		 734/* externals in dasd_devmap.c */
735extern int dasd_max_devindex;
736extern int dasd_probeonly;
737extern int dasd_autodetect;
40545573 738extern int dasd_nopav;
f3eb5384 739extern int dasd_nofcx;
1da177e4
LT		 740
741int dasd_devmap_init(void);
742void dasd_devmap_exit(void);
743
744struct dasd_device *dasd_create_device(struct ccw_device *);
745void dasd_delete_device(struct dasd_device *);
746
f24acd45
HH		 747int dasd_get_feature(struct ccw_device *, int);
748int dasd_set_feature(struct ccw_device *, int, int);
749
1da177e4
LT		 750int dasd_add_sysfs_files(struct ccw_device *);
751void dasd_remove_sysfs_files(struct ccw_device *);
752
753struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
a00bfd71 754struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
1da177e4
LT		 755struct dasd_device *dasd_device_from_devindex(int);
756
65f8da47
SW		 757void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
758struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
759
1da177e4 760int dasd_parse(void);
69f90f6a 761int dasd_busid_known(const char *);
1da177e4
LT		 762
763/* externals in dasd_gendisk.c */
764int dasd_gendisk_init(void);
765void dasd_gendisk_exit(void);
8e09f215
SW		 766int dasd_gendisk_alloc(struct dasd_block *);
767void dasd_gendisk_free(struct dasd_block *);
768int dasd_scan_partitions(struct dasd_block *);
769void dasd_destroy_partitions(struct dasd_block *);
1da177e4
LT		 770
771/* externals in dasd_ioctl.c */
57a7c0bc 772int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
1da177e4
LT		 773
774/* externals in dasd_proc.c */
775int dasd_proc_init(void);
776void dasd_proc_exit(void);
777
778/* externals in dasd_erp.c */
779struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
780struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
781struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
782 struct dasd_device *);
783void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
784void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
fc19f381 785void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
1da177e4 786
1da177e4 787/* externals in dasd_3990_erp.c */
1da177e4 788struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
f60c768c 789void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
1da177e4 790
20c64468
SW		 791/* externals in dasd_eer.c */
792#ifdef CONFIG_DASD_EER
793int dasd_eer_init(void);
794void dasd_eer_exit(void);
795int dasd_eer_enable(struct dasd_device *);
796void dasd_eer_disable(struct dasd_device *);
797void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
798 unsigned int id);
799void dasd_eer_snss(struct dasd_device *);
800
801static inline int dasd_eer_enabled(struct dasd_device *device)
802{
803 return device->eer_cqr != NULL;
804}
805#else
806#define dasd_eer_init() (0)
807#define dasd_eer_exit() do { } while (0)
808#define dasd_eer_enable(d) (0)
809#define dasd_eer_disable(d) do { } while (0)
810#define dasd_eer_write(d,c,i) do { } while (0)
811#define dasd_eer_snss(d) do { } while (0)
812#define dasd_eer_enabled(d) (0)
813#endif /* CONFIG_DASD_ERR */
814
1da177e4 815#endif /* DASD_H */
Linux kernel - Deliverables
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