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 * The following flags are used to suppress output of certain errors.
241 * These flags should only be used for format checks!
242 */
243 #define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */
244 #define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/
245 #define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */
246
247 /* Signature for error recovery functions. */
248 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
249
250 /*
251 * A single CQR can only contain a maximum of 255 CCWs. It is limited by
252 * the locate record and locate record extended count value which can only hold
253 * 1 Byte max.
254 */
255 #define DASD_CQR_MAX_CCW 255
256
257 /*
258 * Unique identifier for dasd device.
259 */
260 #define UA_NOT_CONFIGURED 0x00
261 #define UA_BASE_DEVICE 0x01
262 #define UA_BASE_PAV_ALIAS 0x02
263 #define UA_HYPER_PAV_ALIAS 0x03
264
265 struct dasd_uid {
266 __u8 type;
267 char vendor[4];
268 char serial[15];
269 __u16 ssid;
270 __u8 real_unit_addr;
271 __u8 base_unit_addr;
272 char vduit[33];
273 };
274
275 /*
276 * the struct dasd_discipline is
277 * sth like a table of virtual functions, if you think of dasd_eckd
278 * inheriting dasd...
279 * no, currently we are not planning to reimplement the driver in C++
280 */
281 struct dasd_discipline {
282 struct module *owner;
283 char ebcname[8]; /* a name used for tagging and printks */
284 char name[8]; /* a name used for tagging and printks */
285 int max_blocks; /* maximum number of blocks to be chained */
286
287 struct list_head list; /* used for list of disciplines */
288
289 /*
290 * Device recognition functions. check_device is used to verify
291 * the sense data and the information returned by read device
292 * characteristics. It returns 0 if the discipline can be used
293 * for the device in question. uncheck_device is called during
294 * device shutdown to deregister a device from its discipline.
295 */
296 int (*check_device) (struct dasd_device *);
297 void (*uncheck_device) (struct dasd_device *);
298
299 /*
300 * do_analysis is used in the step from device state "basic" to
301 * state "accept". It returns 0 if the device can be made ready,
302 * it returns -EMEDIUMTYPE if the device can't be made ready or
303 * -EAGAIN if do_analysis started a ccw that needs to complete
304 * before the analysis may be repeated.
305 */
306 int (*do_analysis) (struct dasd_block *);
307
308 /*
309 * This function is called, when new paths become available.
310 * Disciplins may use this callback to do necessary setup work,
311 * e.g. verify that new path is compatible with the current
312 * configuration.
313 */
314 int (*verify_path)(struct dasd_device *, __u8);
315
316 /*
317 * Last things to do when a device is set online, and first things
318 * when it is set offline.
319 */
320 int (*basic_to_ready) (struct dasd_device *);
321 int (*online_to_ready) (struct dasd_device *);
322 int (*basic_to_known)(struct dasd_device *);
323
324 /* (struct dasd_device *);
325 * Device operation functions. build_cp creates a ccw chain for
326 * a block device request, start_io starts the request and
327 * term_IO cancels it (e.g. in case of a timeout). format_device
328 * formats the device and check_device_format compares the format of
329 * a device with the expected format_data.
330 * handle_terminated_request allows to examine a cqr and prepare
331 * it for retry.
332 */
333 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
334 struct dasd_block *,
335 struct request *);
336 int (*start_IO) (struct dasd_ccw_req *);
337 int (*term_IO) (struct dasd_ccw_req *);
338 void (*handle_terminated_request) (struct dasd_ccw_req *);
339 int (*format_device) (struct dasd_device *,
340 struct format_data_t *, int);
341 int (*check_device_format)(struct dasd_device *,
342 struct format_check_t *, int);
343 int (*free_cp) (struct dasd_ccw_req *, struct request *);
344
345 /*
346 * Error recovery functions. examine_error() returns a value that
347 * indicates what to do for an error condition. If examine_error()
348 * returns 'dasd_era_recover' erp_action() is called to create a
349 * special error recovery ccw. erp_postaction() is called after
350 * an error recovery ccw has finished its execution. dump_sense
351 * is called for every error condition to print the sense data
352 * to the console.
353 */
354 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
355 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
356 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
357 struct irb *);
358 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
359 void (*check_for_device_change) (struct dasd_device *,
360 struct dasd_ccw_req *,
361 struct irb *);
362
363 /* i/o control functions. */
364 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
365 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
366 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
367
368 /* suspend/resume functions */
369 int (*freeze) (struct dasd_device *);
370 int (*restore) (struct dasd_device *);
371
372 /* reload device after state change */
373 int (*reload) (struct dasd_device *);
374
375 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
376 void (*kick_validate) (struct dasd_device *);
377 int (*check_attention)(struct dasd_device *, __u8);
378 int (*host_access_count)(struct dasd_device *);
379 int (*hosts_print)(struct dasd_device *, struct seq_file *);
380 };
381
382 extern struct dasd_discipline *dasd_diag_discipline_pointer;
383
384 /*
385 * Notification numbers for extended error reporting notifications:
386 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
387 * eer pointer) is freed. The error reporting module needs to do all necessary
388 * cleanup steps.
389 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
390 */
391 #define DASD_EER_DISABLE 0
392 #define DASD_EER_TRIGGER 1
393
394 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
395 #define DASD_EER_FATALERROR 1
396 #define DASD_EER_NOPATH 2
397 #define DASD_EER_STATECHANGE 3
398 #define DASD_EER_PPRCSUSPEND 4
399
400 struct dasd_path {
401 __u8 opm;
402 __u8 tbvpm;
403 __u8 ppm;
404 __u8 npm;
405 /* paths that are not used because of a special condition */
406 __u8 cablepm; /* miss-cabled */
407 __u8 hpfpm; /* the HPF requirements of the other paths are not met */
408 __u8 cuirpm; /* CUIR varied offline */
409 };
410
411 struct dasd_profile_info {
412 /* legacy part of profile data, as in dasd_profile_info_t */
413 unsigned int dasd_io_reqs; /* number of requests processed */
414 unsigned int dasd_io_sects; /* number of sectors processed */
415 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
416 unsigned int dasd_io_times[32]; /* histogram of requests's times */
417 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */
418 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
419 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
420 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
421 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
422 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
423
424 /* new data */
425 struct timespec starttod; /* time of start or last reset */
426 unsigned int dasd_io_alias; /* requests using an alias */
427 unsigned int dasd_io_tpm; /* requests using transport mode */
428 unsigned int dasd_read_reqs; /* total number of read requests */
429 unsigned int dasd_read_sects; /* total number read sectors */
430 unsigned int dasd_read_alias; /* read request using an alias */
431 unsigned int dasd_read_tpm; /* read requests in transport mode */
432 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
433 unsigned int dasd_read_times[32]; /* histogram of requests's times */
434 unsigned int dasd_read_time1[32]; /* hist. time from build to start */
435 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
436 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
437 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
438 };
439
440 struct dasd_profile {
441 struct dentry *dentry;
442 struct dasd_profile_info *data;
443 spinlock_t lock;
444 };
445
446 struct dasd_device {
447 /* Block device stuff. */
448 struct dasd_block *block;
449
450 unsigned int devindex;
451 unsigned long flags; /* per device flags */
452 unsigned short features; /* copy of devmap-features (read-only!) */
453
454 /* extended error reporting stuff (eer) */
455 struct dasd_ccw_req *eer_cqr;
456
457 /* Device discipline stuff. */
458 struct dasd_discipline *discipline;
459 struct dasd_discipline *base_discipline;
460 void *private;
461 struct dasd_path path_data;
462
463 /* Device state and target state. */
464 int state, target;
465 struct mutex state_mutex;
466 int stopped; /* device (ccw_device_start) was stopped */
467
468 /* reference count. */
469 atomic_t ref_count;
470
471 /* ccw queue and memory for static ccw/erp buffers. */
472 struct list_head ccw_queue;
473 spinlock_t mem_lock;
474 void *ccw_mem;
475 void *erp_mem;
476 struct list_head ccw_chunks;
477 struct list_head erp_chunks;
478
479 atomic_t tasklet_scheduled;
480 struct tasklet_struct tasklet;
481 struct work_struct kick_work;
482 struct work_struct restore_device;
483 struct work_struct reload_device;
484 struct work_struct kick_validate;
485 struct work_struct suc_work;
486 struct timer_list timer;
487
488 debug_info_t *debug_area;
489
490 struct ccw_device *cdev;
491
492 /* hook for alias management */
493 struct list_head alias_list;
494
495 /* default expiration time in s */
496 unsigned long default_expires;
497 unsigned long default_retries;
498
499 unsigned long blk_timeout;
500
501 struct dentry *debugfs_dentry;
502 struct dentry *hosts_dentry;
503 struct dasd_profile profile;
504 };
505
506 struct dasd_block {
507 /* Block device stuff. */
508 struct gendisk *gdp;
509 struct request_queue *request_queue;
510 spinlock_t request_queue_lock;
511 struct block_device *bdev;
512 atomic_t open_count;
513
514 unsigned long long blocks; /* size of volume in blocks */
515 unsigned int bp_block; /* bytes per block */
516 unsigned int s2b_shift; /* log2 (bp_block/512) */
517
518 struct dasd_device *base;
519 struct list_head ccw_queue;
520 spinlock_t queue_lock;
521
522 atomic_t tasklet_scheduled;
523 struct tasklet_struct tasklet;
524 struct timer_list timer;
525
526 struct dentry *debugfs_dentry;
527 struct dasd_profile profile;
528 };
529
530 struct dasd_attention_data {
531 struct dasd_device *device;
532 __u8 lpum;
533 };
534
535 /* reasons why device (ccw_device_start) was stopped */
536 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */
537 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */
538 #define DASD_STOPPED_PENDING 4 /* long busy */
539 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
540 #define DASD_STOPPED_SU 16 /* summary unit check handling */
541 #define DASD_STOPPED_PM 32 /* pm state transition */
542 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */
543
544 /* per device flags */
545 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
546 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
547 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
548 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
549 * confuse this with the user specified
550 * read-only feature.
551 */
552 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
553 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
554 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
555 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
556 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
557 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
558 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
559 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */
560
561 #define DASD_SLEEPON_START_TAG ((void *) 1)
562 #define DASD_SLEEPON_END_TAG ((void *) 2)
563
564 void dasd_put_device_wake(struct dasd_device *);
565
566 /*
567 * Reference count inliners
568 */
569 static inline void
dasd_get_device(struct dasd_device * device)570 dasd_get_device(struct dasd_device *device)
571 {
572 atomic_inc(&device->ref_count);
573 }
574
575 static inline void
dasd_put_device(struct dasd_device * device)576 dasd_put_device(struct dasd_device *device)
577 {
578 if (atomic_dec_return(&device->ref_count) == 0)
579 dasd_put_device_wake(device);
580 }
581
582 /*
583 * The static memory in ccw_mem and erp_mem is managed by a sorted
584 * list of free memory chunks.
585 */
586 struct dasd_mchunk
587 {
588 struct list_head list;
589 unsigned long size;
590 } __attribute__ ((aligned(8)));
591
592 static inline void
dasd_init_chunklist(struct list_head * chunk_list,void * mem,unsigned long size)593 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
594 unsigned long size)
595 {
596 struct dasd_mchunk *chunk;
597
598 INIT_LIST_HEAD(chunk_list);
599 chunk = (struct dasd_mchunk *) mem;
600 chunk->size = size - sizeof(struct dasd_mchunk);
601 list_add(&chunk->list, chunk_list);
602 }
603
604 static inline void *
dasd_alloc_chunk(struct list_head * chunk_list,unsigned long size)605 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
606 {
607 struct dasd_mchunk *chunk, *tmp;
608
609 size = (size + 7L) & -8L;
610 list_for_each_entry(chunk, chunk_list, list) {
611 if (chunk->size < size)
612 continue;
613 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
614 char *endaddr = (char *) (chunk + 1) + chunk->size;
615 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
616 tmp->size = size;
617 chunk->size -= size + sizeof(struct dasd_mchunk);
618 chunk = tmp;
619 } else
620 list_del(&chunk->list);
621 return (void *) (chunk + 1);
622 }
623 return NULL;
624 }
625
626 static inline void
dasd_free_chunk(struct list_head * chunk_list,void * mem)627 dasd_free_chunk(struct list_head *chunk_list, void *mem)
628 {
629 struct dasd_mchunk *chunk, *tmp;
630 struct list_head *p, *left;
631
632 chunk = (struct dasd_mchunk *)
633 ((char *) mem - sizeof(struct dasd_mchunk));
634 /* Find out the left neighbour in chunk_list. */
635 left = chunk_list;
636 list_for_each(p, chunk_list) {
637 if (list_entry(p, struct dasd_mchunk, list) > chunk)
638 break;
639 left = p;
640 }
641 /* Try to merge with right neighbour = next element from left. */
642 if (left->next != chunk_list) {
643 tmp = list_entry(left->next, struct dasd_mchunk, list);
644 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
645 list_del(&tmp->list);
646 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
647 }
648 }
649 /* Try to merge with left neighbour. */
650 if (left != chunk_list) {
651 tmp = list_entry(left, struct dasd_mchunk, list);
652 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
653 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
654 return;
655 }
656 }
657 __list_add(&chunk->list, left, left->next);
658 }
659
660 /*
661 * Check if bsize is in { 512, 1024, 2048, 4096 }
662 */
663 static inline int
dasd_check_blocksize(int bsize)664 dasd_check_blocksize(int bsize)
665 {
666 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
667 return -EMEDIUMTYPE;
668 return 0;
669 }
670
671 /* externals in dasd.c */
672 #define DASD_PROFILE_OFF 0
673 #define DASD_PROFILE_ON 1
674 #define DASD_PROFILE_GLOBAL_ONLY 2
675
676 extern debug_info_t *dasd_debug_area;
677 extern struct dasd_profile dasd_global_profile;
678 extern unsigned int dasd_global_profile_level;
679 extern const struct block_device_operations dasd_device_operations;
680
681 extern struct kmem_cache *dasd_page_cache;
682
683 struct dasd_ccw_req *
684 dasd_kmalloc_request(int , int, int, struct dasd_device *);
685 struct dasd_ccw_req *
686 dasd_smalloc_request(int , int, int, struct dasd_device *);
687 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
688 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
689 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
690
691 static inline int
dasd_kmalloc_set_cda(struct ccw1 * ccw,void * cda,struct dasd_device * device)692 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
693 {
694 return set_normalized_cda(ccw, cda);
695 }
696
697 struct dasd_device *dasd_alloc_device(void);
698 void dasd_free_device(struct dasd_device *);
699
700 struct dasd_block *dasd_alloc_block(void);
701 void dasd_free_block(struct dasd_block *);
702
703 enum blk_eh_timer_return dasd_times_out(struct request *req);
704
705 void dasd_enable_device(struct dasd_device *);
706 void dasd_set_target_state(struct dasd_device *, int);
707 void dasd_kick_device(struct dasd_device *);
708 void dasd_restore_device(struct dasd_device *);
709 void dasd_reload_device(struct dasd_device *);
710
711 void dasd_add_request_head(struct dasd_ccw_req *);
712 void dasd_add_request_tail(struct dasd_ccw_req *);
713 int dasd_start_IO(struct dasd_ccw_req *);
714 int dasd_term_IO(struct dasd_ccw_req *);
715 void dasd_schedule_device_bh(struct dasd_device *);
716 void dasd_schedule_block_bh(struct dasd_block *);
717 int dasd_sleep_on(struct dasd_ccw_req *);
718 int dasd_sleep_on_queue(struct list_head *);
719 int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
720 int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
721 void dasd_device_set_timer(struct dasd_device *, int);
722 void dasd_device_clear_timer(struct dasd_device *);
723 void dasd_block_set_timer(struct dasd_block *, int);
724 void dasd_block_clear_timer(struct dasd_block *);
725 int dasd_cancel_req(struct dasd_ccw_req *);
726 int dasd_flush_device_queue(struct dasd_device *);
727 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
728 void dasd_generic_free_discipline(struct dasd_device *);
729 void dasd_generic_remove (struct ccw_device *cdev);
730 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
731 int dasd_generic_set_offline (struct ccw_device *cdev);
732 int dasd_generic_notify(struct ccw_device *, int);
733 int dasd_generic_last_path_gone(struct dasd_device *);
734 int dasd_generic_path_operational(struct dasd_device *);
735 void dasd_generic_shutdown(struct ccw_device *);
736
737 void dasd_generic_handle_state_change(struct dasd_device *);
738 int dasd_generic_pm_freeze(struct ccw_device *);
739 int dasd_generic_restore_device(struct ccw_device *);
740 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
741 void dasd_generic_path_event(struct ccw_device *, int *);
742 int dasd_generic_verify_path(struct dasd_device *, __u8);
743
744 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
745 char *dasd_get_sense(struct irb *);
746
747 void dasd_device_set_stop_bits(struct dasd_device *, int);
748 void dasd_device_remove_stop_bits(struct dasd_device *, int);
749
750 int dasd_device_is_ro(struct dasd_device *);
751
752 void dasd_profile_reset(struct dasd_profile *);
753 int dasd_profile_on(struct dasd_profile *);
754 void dasd_profile_off(struct dasd_profile *);
755 char *dasd_get_user_string(const char __user *, size_t);
756
757 /* externals in dasd_devmap.c */
758 extern int dasd_max_devindex;
759 extern int dasd_probeonly;
760 extern int dasd_autodetect;
761 extern int dasd_nopav;
762 extern int dasd_nofcx;
763
764 int dasd_devmap_init(void);
765 void dasd_devmap_exit(void);
766
767 struct dasd_device *dasd_create_device(struct ccw_device *);
768 void dasd_delete_device(struct dasd_device *);
769
770 int dasd_get_feature(struct ccw_device *, int);
771 int dasd_set_feature(struct ccw_device *, int, int);
772
773 int dasd_add_sysfs_files(struct ccw_device *);
774 void dasd_remove_sysfs_files(struct ccw_device *);
775
776 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
777 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
778 struct dasd_device *dasd_device_from_devindex(int);
779
780 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
781 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
782
783 int dasd_parse(void);
784 int dasd_busid_known(const char *);
785
786 /* externals in dasd_gendisk.c */
787 int dasd_gendisk_init(void);
788 void dasd_gendisk_exit(void);
789 int dasd_gendisk_alloc(struct dasd_block *);
790 void dasd_gendisk_free(struct dasd_block *);
791 int dasd_scan_partitions(struct dasd_block *);
792 void dasd_destroy_partitions(struct dasd_block *);
793
794 /* externals in dasd_ioctl.c */
795 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
796
797 /* externals in dasd_proc.c */
798 int dasd_proc_init(void);
799 void dasd_proc_exit(void);
800
801 /* externals in dasd_erp.c */
802 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
803 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
804 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
805 struct dasd_device *);
806 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
807 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
808 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
809
810 /* externals in dasd_3990_erp.c */
811 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
812 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
813
814 /* externals in dasd_eer.c */
815 #ifdef CONFIG_DASD_EER
816 int dasd_eer_init(void);
817 void dasd_eer_exit(void);
818 int dasd_eer_enable(struct dasd_device *);
819 void dasd_eer_disable(struct dasd_device *);
820 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
821 unsigned int id);
822 void dasd_eer_snss(struct dasd_device *);
823
dasd_eer_enabled(struct dasd_device * device)824 static inline int dasd_eer_enabled(struct dasd_device *device)
825 {
826 return device->eer_cqr != NULL;
827 }
828 #else
829 #define dasd_eer_init() (0)
830 #define dasd_eer_exit() do { } while (0)
831 #define dasd_eer_enable(d) (0)
832 #define dasd_eer_disable(d) do { } while (0)
833 #define dasd_eer_write(d,c,i) do { } while (0)
834 #define dasd_eer_snss(d) do { } while (0)
835 #define dasd_eer_enabled(d) (0)
836 #endif /* CONFIG_DASD_ERR */
837
838 #endif /* DASD_H */
839