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