1 /*
2 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
3 * Horst Hummel <Horst.Hummel@de.ibm.com>
4 * Martin Schwidefsky <schwidefsky@de.ibm.com>
5 * Bugreports.to..: <Linux390@de.ibm.com>
6 * Copyright IBM Corp. 1999, 2009
7 */
8
9 #ifndef DASD_INT_H
10 #define DASD_INT_H
11
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.
21 * unfmt: the device could not be analyzed (format is unknown).
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
42 #define DASD_STATE_UNFMT 3
43 #define DASD_STATE_READY 4
44 #define DASD_STATE_ONLINE 5
45
46 #include <linux/module.h>
47 #include <linux/wait.h>
48 #include <linux/blkdev.h>
49 #include <linux/genhd.h>
50 #include <linux/hdreg.h>
51 #include <linux/interrupt.h>
52 #include <linux/log2.h>
53 #include <asm/ccwdev.h>
54 #include <linux/workqueue.h>
55 #include <asm/debug.h>
56 #include <asm/dasd.h>
57 #include <asm/idals.h>
58
59 /* DASD discipline magic */
60 #define DASD_ECKD_MAGIC 0xC5C3D2C4
61 #define DASD_DIAG_MAGIC 0xC4C9C1C7
62 #define DASD_FBA_MAGIC 0xC6C2C140
63
64 /*
65 * SECTION: Type definitions
66 */
67 struct dasd_device;
68 struct dasd_block;
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
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
81 /* lock class for nested cdev lock */
82 #define CDEV_NESTED_FIRST 1
83 #define CDEV_NESTED_SECOND 2
84
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...) \
89 do { \
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...) \
97 do { \
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...)\
105 do { \
106 debug_sprintf_event(dasd_debug_area, \
107 d_level,\
108 d_str "\n", \
109 d_data); \
110 } while(0)
111
112 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \
113 do { \
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
122 #define DBF_EXC(d_level, d_str, d_data...)\
123 do { \
124 debug_sprintf_exception(dasd_debug_area, \
125 d_level,\
126 d_str "\n", \
127 d_data); \
128 } while(0)
129
130 /* limit size for an errorstring */
131 #define ERRORLENGTH 30
132
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...)\
145 do { \
146 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
147 dev_name(&d_device->cdev->dev), d_args); \
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...)\
152 do { \
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...)\
159 do { \
160 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
161 dev_name(&d_device->cdev->dev), d_args); \
162 } while(0)
163
164 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
165 do { \
166 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
167 } while(0)
168
169 struct dasd_ccw_req {
170 unsigned int magic; /* Eye catcher */
171 struct list_head devlist; /* for dasd_device request queue */
172 struct list_head blocklist; /* for dasd_block request queue */
173
174 /* Where to execute what... */
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 */
178 struct dasd_device *basedev; /* base device if no block->base */
179 void *cpaddr; /* address of ccw or tcw */
180 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
181 char status; /* status of this request */
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 */
187 unsigned long expires; /* expiration period in jiffies */
188 char lpm; /* logical path mask */
189 void *data; /* pointer to data area */
190
191 /* these are important for recovering erroneous requests */
192 int intrc; /* internal error, e.g. from start_IO */
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. */
204 void (*callback)(struct dasd_ccw_req *, void *data);
205 void *callback_data;
206 };
207
208 /*
209 * dasd_ccw_req -> status can be:
210 */
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 */
223 #define DASD_CQR_SUCCESS 0x85 /* request was successful */
224
225 /* default expiration time*/
226 #define DASD_EXPIRES 300
227 #define DASD_EXPIRES_MAX 40000000
228 #define DASD_RETRIES 256
229 #define DASD_RETRIES_MAX 32768
230
231 /* per dasd_ccw_req flags */
232 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
233 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
234 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */
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 */
239
240 /* Signature for error recovery functions. */
241 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
242
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
251 struct 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
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 */
267 struct 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
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
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
302 /*
303 * Last things to do when a device is set online, and first things
304 * when it is set offline.
305 */
306 int (*basic_to_ready) (struct dasd_device *);
307 int (*online_to_ready) (struct dasd_device *);
308 int (*basic_to_known)(struct dasd_device *);
309
310 /* (struct dasd_device *);
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 */
318 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
319 struct dasd_block *,
320 struct request *);
321 int (*start_IO) (struct dasd_ccw_req *);
322 int (*term_IO) (struct dasd_ccw_req *);
323 void (*handle_terminated_request) (struct dasd_ccw_req *);
324 int (*format_device) (struct dasd_device *,
325 struct format_data_t *, int enable_pav);
326 int (*free_cp) (struct dasd_ccw_req *, struct request *);
327
328 /*
329 * Error recovery functions. examine_error() returns a value that
330 * indicates what to do for an error condition. If examine_error()
331 * returns 'dasd_era_recover' erp_action() is called to create a
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 */
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 *);
341 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
342 void (*check_for_device_change) (struct dasd_device *,
343 struct dasd_ccw_req *,
344 struct irb *);
345
346 /* i/o control functions. */
347 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
348 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
349 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
350
351 /* suspend/resume functions */
352 int (*freeze) (struct dasd_device *);
353 int (*restore) (struct dasd_device *);
354
355 /* reload device after state change */
356 int (*reload) (struct dasd_device *);
357
358 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
359 void (*kick_validate) (struct dasd_device *);
360 int (*check_attention)(struct dasd_device *, __u8);
361 };
362
363 extern struct dasd_discipline *dasd_diag_discipline_pointer;
364
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
381 struct dasd_path {
382 __u8 opm;
383 __u8 tbvpm;
384 __u8 ppm;
385 __u8 npm;
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 */
390 };
391
392 struct 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
421 struct dasd_profile {
422 struct dentry *dentry;
423 struct dasd_profile_info *data;
424 spinlock_t lock;
425 };
426
427 struct dasd_device {
428 /* Block device stuff. */
429 struct dasd_block *block;
430
431 unsigned int devindex;
432 unsigned long flags; /* per device flags */
433 unsigned short features; /* copy of devmap-features (read-only!) */
434
435 /* extended error reporting stuff (eer) */
436 struct dasd_ccw_req *eer_cqr;
437
438 /* Device discipline stuff. */
439 struct dasd_discipline *discipline;
440 struct dasd_discipline *base_discipline;
441 char *private;
442 struct dasd_path path_data;
443
444 /* Device state and target state. */
445 int state, target;
446 struct mutex state_mutex;
447 int stopped; /* device (ccw_device_start) was stopped */
448
449 /* reference count. */
450 atomic_t ref_count;
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;
463 struct work_struct restore_device;
464 struct work_struct reload_device;
465 struct work_struct kick_validate;
466 struct timer_list timer;
467
468 debug_info_t *debug_area;
469
470 struct ccw_device *cdev;
471
472 /* hook for alias management */
473 struct list_head alias_list;
474
475 /* default expiration time in s */
476 unsigned long default_expires;
477 unsigned long default_retries;
478
479 unsigned long blk_timeout;
480
481 struct dentry *debugfs_dentry;
482 struct dasd_profile profile;
483 };
484
485 struct 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
493 unsigned long long blocks; /* size of volume in blocks */
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
505 struct dentry *debugfs_dentry;
506 struct dasd_profile profile;
507 };
508
509 struct dasd_attention_data {
510 struct dasd_device *device;
511 __u8 lpum;
512 };
513
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 */
519 #define DASD_STOPPED_SU 16 /* summary unit check handling */
520 #define DASD_STOPPED_PM 32 /* pm state transition */
521 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */
522
523 /* per device flags */
524 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
525 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
526 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
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 */
531 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
532 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
533 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
534 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
535 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
536 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
537 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
538
539 #define DASD_SLEEPON_START_TAG ((void *) 1)
540 #define DASD_SLEEPON_END_TAG ((void *) 2)
541
542 void dasd_put_device_wake(struct dasd_device *);
543
544 /*
545 * Reference count inliners
546 */
547 static inline void
dasd_get_device(struct dasd_device * device)548 dasd_get_device(struct dasd_device *device)
549 {
550 atomic_inc(&device->ref_count);
551 }
552
553 static inline void
dasd_put_device(struct dasd_device * device)554 dasd_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 */
564 struct dasd_mchunk
565 {
566 struct list_head list;
567 unsigned long size;
568 } __attribute__ ((aligned(8)));
569
570 static inline void
dasd_init_chunklist(struct list_head * chunk_list,void * mem,unsigned long size)571 dasd_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
582 static inline void *
dasd_alloc_chunk(struct list_head * chunk_list,unsigned long size)583 dasd_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
604 static inline void
dasd_free_chunk(struct list_head * chunk_list,void * mem)605 dasd_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 */
641 static inline int
dasd_check_blocksize(int bsize)642 dasd_check_blocksize(int bsize)
643 {
644 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
645 return -EMEDIUMTYPE;
646 return 0;
647 }
648
649 /* externals in dasd.c */
650 #define DASD_PROFILE_OFF 0
651 #define DASD_PROFILE_ON 1
652 #define DASD_PROFILE_GLOBAL_ONLY 2
653
654 extern debug_info_t *dasd_debug_area;
655 extern struct dasd_profile dasd_global_profile;
656 extern unsigned int dasd_global_profile_level;
657 extern const struct block_device_operations dasd_device_operations;
658
659 extern struct kmem_cache *dasd_page_cache;
660
661 struct dasd_ccw_req *
662 dasd_kmalloc_request(int , int, int, struct dasd_device *);
663 struct dasd_ccw_req *
664 dasd_smalloc_request(int , int, int, struct dasd_device *);
665 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
666 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
667 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
668
669 static inline int
dasd_kmalloc_set_cda(struct ccw1 * ccw,void * cda,struct dasd_device * device)670 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
671 {
672 return set_normalized_cda(ccw, cda);
673 }
674
675 struct dasd_device *dasd_alloc_device(void);
676 void dasd_free_device(struct dasd_device *);
677
678 struct dasd_block *dasd_alloc_block(void);
679 void dasd_free_block(struct dasd_block *);
680
681 enum blk_eh_timer_return dasd_times_out(struct request *req);
682
683 void dasd_enable_device(struct dasd_device *);
684 void dasd_set_target_state(struct dasd_device *, int);
685 void dasd_kick_device(struct dasd_device *);
686 void dasd_restore_device(struct dasd_device *);
687 void dasd_reload_device(struct dasd_device *);
688
689 void dasd_add_request_head(struct dasd_ccw_req *);
690 void dasd_add_request_tail(struct dasd_ccw_req *);
691 int dasd_start_IO(struct dasd_ccw_req *);
692 int dasd_term_IO(struct dasd_ccw_req *);
693 void dasd_schedule_device_bh(struct dasd_device *);
694 void dasd_schedule_block_bh(struct dasd_block *);
695 int dasd_sleep_on(struct dasd_ccw_req *);
696 int dasd_sleep_on_queue(struct list_head *);
697 int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
698 int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
699 void dasd_device_set_timer(struct dasd_device *, int);
700 void dasd_device_clear_timer(struct dasd_device *);
701 void dasd_block_set_timer(struct dasd_block *, int);
702 void dasd_block_clear_timer(struct dasd_block *);
703 int dasd_cancel_req(struct dasd_ccw_req *);
704 int dasd_flush_device_queue(struct dasd_device *);
705 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
706 void dasd_generic_remove (struct ccw_device *cdev);
707 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
708 int dasd_generic_set_offline (struct ccw_device *cdev);
709 int dasd_generic_notify(struct ccw_device *, int);
710 int dasd_generic_last_path_gone(struct dasd_device *);
711 int dasd_generic_path_operational(struct dasd_device *);
712 void dasd_generic_shutdown(struct ccw_device *);
713
714 void dasd_generic_handle_state_change(struct dasd_device *);
715 int dasd_generic_pm_freeze(struct ccw_device *);
716 int dasd_generic_restore_device(struct ccw_device *);
717 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
718 void dasd_generic_path_event(struct ccw_device *, int *);
719 int dasd_generic_verify_path(struct dasd_device *, __u8);
720
721 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
722 char *dasd_get_sense(struct irb *);
723
724 void dasd_device_set_stop_bits(struct dasd_device *, int);
725 void dasd_device_remove_stop_bits(struct dasd_device *, int);
726
727 int dasd_device_is_ro(struct dasd_device *);
728
729 void dasd_profile_reset(struct dasd_profile *);
730 int dasd_profile_on(struct dasd_profile *);
731 void dasd_profile_off(struct dasd_profile *);
732 char *dasd_get_user_string(const char __user *, size_t);
733
734 /* externals in dasd_devmap.c */
735 extern int dasd_max_devindex;
736 extern int dasd_probeonly;
737 extern int dasd_autodetect;
738 extern int dasd_nopav;
739 extern int dasd_nofcx;
740
741 int dasd_devmap_init(void);
742 void dasd_devmap_exit(void);
743
744 struct dasd_device *dasd_create_device(struct ccw_device *);
745 void dasd_delete_device(struct dasd_device *);
746
747 int dasd_get_feature(struct ccw_device *, int);
748 int dasd_set_feature(struct ccw_device *, int, int);
749
750 int dasd_add_sysfs_files(struct ccw_device *);
751 void dasd_remove_sysfs_files(struct ccw_device *);
752
753 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
754 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
755 struct dasd_device *dasd_device_from_devindex(int);
756
757 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
758 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
759
760 int dasd_parse(void);
761 int dasd_busid_known(const char *);
762
763 /* externals in dasd_gendisk.c */
764 int dasd_gendisk_init(void);
765 void dasd_gendisk_exit(void);
766 int dasd_gendisk_alloc(struct dasd_block *);
767 void dasd_gendisk_free(struct dasd_block *);
768 int dasd_scan_partitions(struct dasd_block *);
769 void dasd_destroy_partitions(struct dasd_block *);
770
771 /* externals in dasd_ioctl.c */
772 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
773
774 /* externals in dasd_proc.c */
775 int dasd_proc_init(void);
776 void dasd_proc_exit(void);
777
778 /* externals in dasd_erp.c */
779 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
780 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
781 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
782 struct dasd_device *);
783 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
784 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
785 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
786
787 /* externals in dasd_3990_erp.c */
788 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
789 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
790
791 /* externals in dasd_eer.c */
792 #ifdef CONFIG_DASD_EER
793 int dasd_eer_init(void);
794 void dasd_eer_exit(void);
795 int dasd_eer_enable(struct dasd_device *);
796 void dasd_eer_disable(struct dasd_device *);
797 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
798 unsigned int id);
799 void dasd_eer_snss(struct dasd_device *);
800
dasd_eer_enabled(struct dasd_device * device)801 static 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
815 #endif /* DASD_H */
816