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
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)
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.
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.
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
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>
57 #include <asm/idals.h>
58 #include <linux/bitops.h>
59 #include <linux/blk-mq.h>
61 /* DASD discipline magic */
62 #define DASD_ECKD_MAGIC 0xC5C3D2C4
63 #define DASD_DIAG_MAGIC 0xC4C9C1C7
64 #define DASD_FBA_MAGIC 0xC6C2C140
67 * SECTION: Type definitions
72 /* BIT DEFINITIONS FOR SENSE DATA */
73 #define DASD_SENSE_BIT_0 0x80
74 #define DASD_SENSE_BIT_1 0x40
75 #define DASD_SENSE_BIT_2 0x20
76 #define DASD_SENSE_BIT_3 0x10
78 /* BIT DEFINITIONS FOR SIM SENSE */
79 #define DASD_SIM_SENSE 0x0F
80 #define DASD_SIM_MSG_TO_OP 0x03
81 #define DASD_SIM_LOG 0x0C
83 /* lock class for nested cdev lock */
84 #define CDEV_NESTED_FIRST 1
85 #define CDEV_NESTED_SECOND 2
88 * SECTION: MACROs for klogd and s390 debug feature (dbf)
90 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
92 debug_sprintf_event(d_device->debug_area, \
98 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
100 debug_sprintf_exception(d_device->debug_area, \
106 #define DBF_EVENT(d_level, d_str, d_data...)\
108 debug_sprintf_event(dasd_debug_area, \
114 #define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \
116 struct ccw_dev_id __dev_id; \
117 ccw_device_get_id(d_cdev, &__dev_id); \
118 debug_sprintf_event(dasd_debug_area, \
120 "0.%x.%04x " d_str "\n", \
121 __dev_id.ssid, __dev_id.devno, d_data); \
124 #define DBF_EXC(d_level, d_str, d_data...)\
126 debug_sprintf_exception(dasd_debug_area, \
132 /* limit size for an errorstring */
133 #define ERRORLENGTH 30
135 /* definition of dbf debug levels */
136 #define DBF_EMERG 0 /* system is unusable */
137 #define DBF_ALERT 1 /* action must be taken immediately */
138 #define DBF_CRIT 2 /* critical conditions */
139 #define DBF_ERR 3 /* error conditions */
140 #define DBF_WARNING 4 /* warning conditions */
141 #define DBF_NOTICE 5 /* normal but significant condition */
142 #define DBF_INFO 6 /* informational */
143 #define DBF_DEBUG 6 /* debug-level messages */
145 /* messages to be written via klogd and dbf */
146 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
148 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
149 dev_name(&d_device->cdev->dev), d_args); \
150 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
153 #define MESSAGE(d_loglevel,d_string,d_args...)\
155 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
156 DBF_EVENT(DBF_ALERT, d_string, d_args); \
159 /* messages to be written via klogd only */
160 #define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
162 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
163 dev_name(&d_device->cdev->dev), d_args); \
166 #define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
168 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
171 /* Macro to calculate number of blocks per page */
172 #define BLOCKS_PER_PAGE(blksize) (PAGE_SIZE / blksize)
174 struct dasd_ccw_req {
175 unsigned int magic; /* Eye catcher */
176 struct list_head devlist; /* for dasd_device request queue */
177 struct list_head blocklist; /* for dasd_block request queue */
179 /* Where to execute what... */
180 struct dasd_block *block; /* the originating block device */
181 struct dasd_device *memdev; /* the device used to allocate this */
182 struct dasd_device *startdev; /* device the request is started on */
183 struct dasd_device *basedev; /* base device if no block->base */
184 void *cpaddr; /* address of ccw or tcw */
185 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
186 char status; /* status of this request */
187 short retries; /* A retry counter */
188 unsigned long flags; /* flags of this request */
189 struct dasd_queue *dq;
192 unsigned long starttime; /* jiffies time of request start */
193 unsigned long expires; /* expiration period in jiffies */
194 char lpm; /* logical path mask */
195 void *data; /* pointer to data area */
197 /* these are important for recovering erroneous requests */
198 int intrc; /* internal error, e.g. from start_IO */
199 struct irb irb; /* device status in case of an error */
200 struct dasd_ccw_req *refers; /* ERP-chain queueing. */
201 void *function; /* originating ERP action */
203 /* these are for statistics only */
204 unsigned long buildclk; /* TOD-clock of request generation */
205 unsigned long startclk; /* TOD-clock of request start */
206 unsigned long stopclk; /* TOD-clock of request interrupt */
207 unsigned long endclk; /* TOD-clock of request termination */
209 /* Callback that is called after reaching final status. */
210 void (*callback)(struct dasd_ccw_req *, void *data);
215 * dasd_ccw_req -> status can be:
217 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
218 #define DASD_CQR_DONE 0x01 /* request is completed successfully */
219 #define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
220 #define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
221 #define DASD_CQR_FAILED 0x04 /* request is finally failed */
222 #define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
224 #define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
225 #define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
226 #define DASD_CQR_ERROR 0x82 /* request is completed with error */
227 #define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
228 #define DASD_CQR_CLEARED 0x84 /* request was cleared */
229 #define DASD_CQR_SUCCESS 0x85 /* request was successful */
231 /* default expiration time*/
232 #define DASD_EXPIRES 300
233 #define DASD_EXPIRES_MAX 40000000
234 #define DASD_RETRIES 256
235 #define DASD_RETRIES_MAX 32768
237 /* per dasd_ccw_req flags */
238 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
239 #define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
240 #define DASD_CQR_VERIFY_PATH 2 /* path verification request */
241 #define DASD_CQR_ALLOW_SLOCK 3 /* Try this request even when lock was
242 * stolen. Should not be combined with
243 * DASD_CQR_FLAGS_USE_ERP
246 * The following flags are used to suppress output of certain errors.
248 #define DASD_CQR_SUPPRESS_NRF 4 /* Suppress 'No Record Found' error */
249 #define DASD_CQR_SUPPRESS_FP 5 /* Suppress 'File Protected' error*/
250 #define DASD_CQR_SUPPRESS_IL 6 /* Suppress 'Incorrect Length' error */
251 #define DASD_CQR_SUPPRESS_CR 7 /* Suppress 'Command Reject' error */
254 * There is no reliable way to determine the number of available CPUs on
255 * LPAR but there is no big performance difference between 1 and the
256 * maximum CPU number.
257 * 64 is a good trade off performance wise.
259 #define DASD_NR_HW_QUEUES 64
260 #define DASD_MAX_LCU_DEV 256
261 #define DASD_REQ_PER_DEV 4
263 /* Signature for error recovery functions. */
264 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
267 * A single CQR can only contain a maximum of 255 CCWs. It is limited by
268 * the locate record and locate record extended count value which can only hold
271 #define DASD_CQR_MAX_CCW 255
274 * Unique identifier for dasd device.
276 #define UA_NOT_CONFIGURED 0x00
277 #define UA_BASE_DEVICE 0x01
278 #define UA_BASE_PAV_ALIAS 0x02
279 #define UA_HYPER_PAV_ALIAS 0x03
292 * the struct dasd_discipline is
293 * sth like a table of virtual functions, if you think of dasd_eckd
295 * no, currently we are not planning to reimplement the driver in C++
297 struct dasd_discipline {
298 struct module *owner;
299 char ebcname[8]; /* a name used for tagging and printks */
300 char name[8]; /* a name used for tagging and printks */
301 int max_blocks; /* maximum number of blocks to be chained */
303 struct list_head list; /* used for list of disciplines */
306 * Device recognition functions. check_device is used to verify
307 * the sense data and the information returned by read device
308 * characteristics. It returns 0 if the discipline can be used
309 * for the device in question. uncheck_device is called during
310 * device shutdown to deregister a device from its discipline.
312 int (*check_device) (struct dasd_device *);
313 void (*uncheck_device) (struct dasd_device *);
316 * do_analysis is used in the step from device state "basic" to
317 * state "accept". It returns 0 if the device can be made ready,
318 * it returns -EMEDIUMTYPE if the device can't be made ready or
319 * -EAGAIN if do_analysis started a ccw that needs to complete
320 * before the analysis may be repeated.
322 int (*do_analysis) (struct dasd_block *);
325 * This function is called, when new paths become available.
326 * Disciplins may use this callback to do necessary setup work,
327 * e.g. verify that new path is compatible with the current
330 int (*verify_path)(struct dasd_device *, __u8);
333 * Last things to do when a device is set online, and first things
334 * when it is set offline.
336 int (*basic_to_ready) (struct dasd_device *);
337 int (*online_to_ready) (struct dasd_device *);
338 int (*basic_to_known)(struct dasd_device *);
340 /* (struct dasd_device *);
341 * Device operation functions. build_cp creates a ccw chain for
342 * a block device request, start_io starts the request and
343 * term_IO cancels it (e.g. in case of a timeout). format_device
344 * formats the device and check_device_format compares the format of
345 * a device with the expected format_data.
346 * handle_terminated_request allows to examine a cqr and prepare
349 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
352 int (*start_IO) (struct dasd_ccw_req *);
353 int (*term_IO) (struct dasd_ccw_req *);
354 void (*handle_terminated_request) (struct dasd_ccw_req *);
355 int (*format_device) (struct dasd_device *,
356 struct format_data_t *, int);
357 int (*check_device_format)(struct dasd_device *,
358 struct format_check_t *, int);
359 int (*free_cp) (struct dasd_ccw_req *, struct request *);
362 * Error recovery functions. examine_error() returns a value that
363 * indicates what to do for an error condition. If examine_error()
364 * returns 'dasd_era_recover' erp_action() is called to create a
365 * special error recovery ccw. erp_postaction() is called after
366 * an error recovery ccw has finished its execution. dump_sense
367 * is called for every error condition to print the sense data
370 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
371 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
372 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
374 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
375 void (*check_for_device_change) (struct dasd_device *,
376 struct dasd_ccw_req *,
379 /* i/o control functions. */
380 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
381 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
382 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
384 /* suspend/resume functions */
385 int (*freeze) (struct dasd_device *);
386 int (*restore) (struct dasd_device *);
388 /* reload device after state change */
389 int (*reload) (struct dasd_device *);
391 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
392 void (*kick_validate) (struct dasd_device *);
393 int (*check_attention)(struct dasd_device *, __u8);
394 int (*host_access_count)(struct dasd_device *);
395 int (*hosts_print)(struct dasd_device *, struct seq_file *);
396 void (*handle_hpf_error)(struct dasd_device *, struct irb *);
397 void (*disable_hpf)(struct dasd_device *);
398 int (*hpf_enabled)(struct dasd_device *);
399 void (*reset_path)(struct dasd_device *, __u8);
402 extern struct dasd_discipline *dasd_diag_discipline_pointer;
405 * Notification numbers for extended error reporting notifications:
406 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
407 * eer pointer) is freed. The error reporting module needs to do all necessary
409 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
411 #define DASD_EER_DISABLE 0
412 #define DASD_EER_TRIGGER 1
414 /* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
415 #define DASD_EER_FATALERROR 1
416 #define DASD_EER_NOPATH 2
417 #define DASD_EER_STATECHANGE 3
418 #define DASD_EER_PPRCSUSPEND 4
420 /* DASD path handling */
422 #define DASD_PATH_OPERATIONAL 1
423 #define DASD_PATH_TBV 2
424 #define DASD_PATH_PP 3
425 #define DASD_PATH_NPP 4
426 #define DASD_PATH_MISCABLED 5
427 #define DASD_PATH_NOHPF 6
428 #define DASD_PATH_CUIR 7
429 #define DASD_PATH_IFCC 8
431 #define DASD_THRHLD_MAX 4294967295U
432 #define DASD_INTERVAL_MAX 4294967295U
439 struct dasd_conf_data *conf_data;
440 atomic_t error_count;
441 unsigned long errorclk;
445 struct dasd_profile_info {
446 /* legacy part of profile data, as in dasd_profile_info_t */
447 unsigned int dasd_io_reqs; /* number of requests processed */
448 unsigned int dasd_io_sects; /* number of sectors processed */
449 unsigned int dasd_io_secs[32]; /* histogram of request's sizes */
450 unsigned int dasd_io_times[32]; /* histogram of requests's times */
451 unsigned int dasd_io_timps[32]; /* h. of requests's times per sector */
452 unsigned int dasd_io_time1[32]; /* hist. of time from build to start */
453 unsigned int dasd_io_time2[32]; /* hist. of time from start to irq */
454 unsigned int dasd_io_time2ps[32]; /* hist. of time from start to irq */
455 unsigned int dasd_io_time3[32]; /* hist. of time from irq to end */
456 unsigned int dasd_io_nr_req[32]; /* hist. of # of requests in chanq */
459 struct timespec starttod; /* time of start or last reset */
460 unsigned int dasd_io_alias; /* requests using an alias */
461 unsigned int dasd_io_tpm; /* requests using transport mode */
462 unsigned int dasd_read_reqs; /* total number of read requests */
463 unsigned int dasd_read_sects; /* total number read sectors */
464 unsigned int dasd_read_alias; /* read request using an alias */
465 unsigned int dasd_read_tpm; /* read requests in transport mode */
466 unsigned int dasd_read_secs[32]; /* histogram of request's sizes */
467 unsigned int dasd_read_times[32]; /* histogram of requests's times */
468 unsigned int dasd_read_time1[32]; /* hist. time from build to start */
469 unsigned int dasd_read_time2[32]; /* hist. of time from start to irq */
470 unsigned int dasd_read_time3[32]; /* hist. of time from irq to end */
471 unsigned int dasd_read_nr_req[32]; /* hist. of # of requests in chanq */
472 unsigned long dasd_sum_times; /* sum of request times */
473 unsigned long dasd_sum_time_str; /* sum of time from build to start */
474 unsigned long dasd_sum_time_irq; /* sum of time from start to irq */
475 unsigned long dasd_sum_time_end; /* sum of time from irq to end */
478 struct dasd_profile {
479 struct dentry *dentry;
480 struct dasd_profile_info *data;
485 /* Block device stuff. */
486 struct dasd_block *block;
488 unsigned int devindex;
489 unsigned long flags; /* per device flags */
490 unsigned short features; /* copy of devmap-features (read-only!) */
492 /* extended error reporting stuff (eer) */
493 struct dasd_ccw_req *eer_cqr;
495 /* Device discipline stuff. */
496 struct dasd_discipline *discipline;
497 struct dasd_discipline *base_discipline;
499 struct dasd_path path[8];
502 /* Device state and target state. */
504 struct mutex state_mutex;
505 int stopped; /* device (ccw_device_start) was stopped */
507 /* reference count. */
510 /* ccw queue and memory for static ccw/erp buffers. */
511 struct list_head ccw_queue;
515 struct list_head ccw_chunks;
516 struct list_head erp_chunks;
518 atomic_t tasklet_scheduled;
519 struct tasklet_struct tasklet;
520 struct work_struct kick_work;
521 struct work_struct restore_device;
522 struct work_struct reload_device;
523 struct work_struct kick_validate;
524 struct work_struct suc_work;
525 struct work_struct requeue_requests;
526 struct timer_list timer;
528 debug_info_t *debug_area;
530 struct ccw_device *cdev;
532 /* hook for alias management */
533 struct list_head alias_list;
535 /* default expiration time in s */
536 unsigned long default_expires;
537 unsigned long default_retries;
539 unsigned long blk_timeout;
541 unsigned long path_thrhld;
542 unsigned long path_interval;
544 struct dentry *debugfs_dentry;
545 struct dentry *hosts_dentry;
546 struct dasd_profile profile;
550 /* Block device stuff. */
552 struct request_queue *request_queue;
553 spinlock_t request_queue_lock;
554 struct blk_mq_tag_set tag_set;
555 struct block_device *bdev;
558 unsigned long blocks; /* size of volume in blocks */
559 unsigned int bp_block; /* bytes per block */
560 unsigned int s2b_shift; /* log2 (bp_block/512) */
562 struct dasd_device *base;
563 struct list_head ccw_queue;
564 spinlock_t queue_lock;
566 atomic_t tasklet_scheduled;
567 struct tasklet_struct tasklet;
568 struct timer_list timer;
570 struct dentry *debugfs_dentry;
571 struct dasd_profile profile;
574 struct dasd_attention_data {
575 struct dasd_device *device;
583 /* reasons why device (ccw_device_start) was stopped */
584 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */
585 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */
586 #define DASD_STOPPED_PENDING 4 /* long busy */
587 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
588 #define DASD_STOPPED_SU 16 /* summary unit check handling */
589 #define DASD_STOPPED_PM 32 /* pm state transition */
590 #define DASD_UNRESUMED_PM 64 /* pm resume failed state */
592 /* per device flags */
593 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
594 #define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
595 #define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
596 #define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
597 * confuse this with the user specified
600 #define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
601 #define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
602 #define DASD_FLAG_SUSPENDED 9 /* The device was suspended */
603 #define DASD_FLAG_SAFE_OFFLINE 10 /* safe offline processing requested*/
604 #define DASD_FLAG_SAFE_OFFLINE_RUNNING 11 /* safe offline running */
605 #define DASD_FLAG_ABORTALL 12 /* Abort all noretry requests */
606 #define DASD_FLAG_PATH_VERIFY 13 /* Path verification worker running */
607 #define DASD_FLAG_SUC 14 /* unhandled summary unit check */
609 #define DASD_SLEEPON_START_TAG ((void *) 1)
610 #define DASD_SLEEPON_END_TAG ((void *) 2)
612 void dasd_put_device_wake(struct dasd_device *);
615 * Reference count inliners
618 dasd_get_device(struct dasd_device *device)
620 atomic_inc(&device->ref_count);
624 dasd_put_device(struct dasd_device *device)
626 if (atomic_dec_return(&device->ref_count) == 0)
627 dasd_put_device_wake(device);
631 * The static memory in ccw_mem and erp_mem is managed by a sorted
632 * list of free memory chunks.
636 struct list_head list;
638 } __attribute__ ((aligned(8)));
641 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
644 struct dasd_mchunk *chunk;
646 INIT_LIST_HEAD(chunk_list);
647 chunk = (struct dasd_mchunk *) mem;
648 chunk->size = size - sizeof(struct dasd_mchunk);
649 list_add(&chunk->list, chunk_list);
653 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
655 struct dasd_mchunk *chunk, *tmp;
657 size = (size + 7L) & -8L;
658 list_for_each_entry(chunk, chunk_list, list) {
659 if (chunk->size < size)
661 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
662 char *endaddr = (char *) (chunk + 1) + chunk->size;
663 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
665 chunk->size -= size + sizeof(struct dasd_mchunk);
668 list_del(&chunk->list);
669 return (void *) (chunk + 1);
675 dasd_free_chunk(struct list_head *chunk_list, void *mem)
677 struct dasd_mchunk *chunk, *tmp;
678 struct list_head *p, *left;
680 chunk = (struct dasd_mchunk *)
681 ((char *) mem - sizeof(struct dasd_mchunk));
682 /* Find out the left neighbour in chunk_list. */
684 list_for_each(p, chunk_list) {
685 if (list_entry(p, struct dasd_mchunk, list) > chunk)
689 /* Try to merge with right neighbour = next element from left. */
690 if (left->next != chunk_list) {
691 tmp = list_entry(left->next, struct dasd_mchunk, list);
692 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
693 list_del(&tmp->list);
694 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
697 /* Try to merge with left neighbour. */
698 if (left != chunk_list) {
699 tmp = list_entry(left, struct dasd_mchunk, list);
700 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
701 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
705 __list_add(&chunk->list, left, left->next);
709 * Check if bsize is in { 512, 1024, 2048, 4096 }
712 dasd_check_blocksize(int bsize)
714 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
719 /* externals in dasd.c */
720 #define DASD_PROFILE_OFF 0
721 #define DASD_PROFILE_ON 1
722 #define DASD_PROFILE_GLOBAL_ONLY 2
724 extern debug_info_t *dasd_debug_area;
725 extern struct dasd_profile dasd_global_profile;
726 extern unsigned int dasd_global_profile_level;
727 extern const struct block_device_operations dasd_device_operations;
729 extern struct kmem_cache *dasd_page_cache;
731 struct dasd_ccw_req *
732 dasd_kmalloc_request(int , int, int, struct dasd_device *);
733 struct dasd_ccw_req *
734 dasd_smalloc_request(int , int, int, struct dasd_device *);
735 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
736 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
737 void dasd_wakeup_cb(struct dasd_ccw_req *, void *);
740 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
742 return set_normalized_cda(ccw, cda);
745 struct dasd_device *dasd_alloc_device(void);
746 void dasd_free_device(struct dasd_device *);
748 struct dasd_block *dasd_alloc_block(void);
749 void dasd_free_block(struct dasd_block *);
751 enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved);
753 void dasd_enable_device(struct dasd_device *);
754 void dasd_set_target_state(struct dasd_device *, int);
755 void dasd_kick_device(struct dasd_device *);
756 void dasd_restore_device(struct dasd_device *);
757 void dasd_reload_device(struct dasd_device *);
758 void dasd_schedule_requeue(struct dasd_device *);
760 void dasd_add_request_head(struct dasd_ccw_req *);
761 void dasd_add_request_tail(struct dasd_ccw_req *);
762 int dasd_start_IO(struct dasd_ccw_req *);
763 int dasd_term_IO(struct dasd_ccw_req *);
764 void dasd_schedule_device_bh(struct dasd_device *);
765 void dasd_schedule_block_bh(struct dasd_block *);
766 int dasd_sleep_on(struct dasd_ccw_req *);
767 int dasd_sleep_on_queue(struct list_head *);
768 int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
769 int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
770 void dasd_device_set_timer(struct dasd_device *, int);
771 void dasd_device_clear_timer(struct dasd_device *);
772 void dasd_block_set_timer(struct dasd_block *, int);
773 void dasd_block_clear_timer(struct dasd_block *);
774 int dasd_cancel_req(struct dasd_ccw_req *);
775 int dasd_flush_device_queue(struct dasd_device *);
776 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
777 void dasd_generic_free_discipline(struct dasd_device *);
778 void dasd_generic_remove (struct ccw_device *cdev);
779 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
780 int dasd_generic_set_offline (struct ccw_device *cdev);
781 int dasd_generic_notify(struct ccw_device *, int);
782 int dasd_generic_last_path_gone(struct dasd_device *);
783 int dasd_generic_path_operational(struct dasd_device *);
784 void dasd_generic_shutdown(struct ccw_device *);
786 void dasd_generic_handle_state_change(struct dasd_device *);
787 int dasd_generic_pm_freeze(struct ccw_device *);
788 int dasd_generic_restore_device(struct ccw_device *);
789 enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
790 void dasd_generic_path_event(struct ccw_device *, int *);
791 int dasd_generic_verify_path(struct dasd_device *, __u8);
793 int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
794 char *dasd_get_sense(struct irb *);
796 void dasd_device_set_stop_bits(struct dasd_device *, int);
797 void dasd_device_remove_stop_bits(struct dasd_device *, int);
799 int dasd_device_is_ro(struct dasd_device *);
801 void dasd_profile_reset(struct dasd_profile *);
802 int dasd_profile_on(struct dasd_profile *);
803 void dasd_profile_off(struct dasd_profile *);
804 char *dasd_get_user_string(const char __user *, size_t);
806 /* externals in dasd_devmap.c */
807 extern int dasd_max_devindex;
808 extern int dasd_probeonly;
809 extern int dasd_autodetect;
810 extern int dasd_nopav;
811 extern int dasd_nofcx;
813 int dasd_devmap_init(void);
814 void dasd_devmap_exit(void);
816 struct dasd_device *dasd_create_device(struct ccw_device *);
817 void dasd_delete_device(struct dasd_device *);
819 int dasd_get_feature(struct ccw_device *, int);
820 int dasd_set_feature(struct ccw_device *, int, int);
822 int dasd_add_sysfs_files(struct ccw_device *);
823 void dasd_remove_sysfs_files(struct ccw_device *);
825 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
826 struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
827 struct dasd_device *dasd_device_from_devindex(int);
829 void dasd_add_link_to_gendisk(struct gendisk *, struct dasd_device *);
830 struct dasd_device *dasd_device_from_gendisk(struct gendisk *);
832 int dasd_parse(void) __init;
833 int dasd_busid_known(const char *);
835 /* externals in dasd_gendisk.c */
836 int dasd_gendisk_init(void);
837 void dasd_gendisk_exit(void);
838 int dasd_gendisk_alloc(struct dasd_block *);
839 void dasd_gendisk_free(struct dasd_block *);
840 int dasd_scan_partitions(struct dasd_block *);
841 void dasd_destroy_partitions(struct dasd_block *);
843 /* externals in dasd_ioctl.c */
844 int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
846 /* externals in dasd_proc.c */
847 int dasd_proc_init(void);
848 void dasd_proc_exit(void);
850 /* externals in dasd_erp.c */
851 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
852 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
853 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
854 struct dasd_device *);
855 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
856 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
857 void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
859 /* externals in dasd_3990_erp.c */
860 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
861 void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
863 /* externals in dasd_eer.c */
864 #ifdef CONFIG_DASD_EER
865 int dasd_eer_init(void);
866 void dasd_eer_exit(void);
867 int dasd_eer_enable(struct dasd_device *);
868 void dasd_eer_disable(struct dasd_device *);
869 void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
871 void dasd_eer_snss(struct dasd_device *);
873 static inline int dasd_eer_enabled(struct dasd_device *device)
875 return device->eer_cqr != NULL;
878 #define dasd_eer_init() (0)
879 #define dasd_eer_exit() do { } while (0)
880 #define dasd_eer_enable(d) (0)
881 #define dasd_eer_disable(d) do { } while (0)
882 #define dasd_eer_write(d,c,i) do { } while (0)
883 #define dasd_eer_snss(d) do { } while (0)
884 #define dasd_eer_enabled(d) (0)
885 #endif /* CONFIG_DASD_ERR */
888 /* DASD path handling functions */
891 * helper functions to modify bit masks for a given channel path for a device
893 static inline int dasd_path_is_operational(struct dasd_device *device, int chp)
895 return test_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
898 static inline int dasd_path_need_verify(struct dasd_device *device, int chp)
900 return test_bit(DASD_PATH_TBV, &device->path[chp].flags);
903 static inline void dasd_path_verify(struct dasd_device *device, int chp)
905 __set_bit(DASD_PATH_TBV, &device->path[chp].flags);
908 static inline void dasd_path_clear_verify(struct dasd_device *device, int chp)
910 __clear_bit(DASD_PATH_TBV, &device->path[chp].flags);
913 static inline void dasd_path_clear_all_verify(struct dasd_device *device)
917 for (chp = 0; chp < 8; chp++)
918 dasd_path_clear_verify(device, chp);
921 static inline void dasd_path_operational(struct dasd_device *device, int chp)
923 __set_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
924 device->opm |= (0x80 >> chp);
927 static inline void dasd_path_nonpreferred(struct dasd_device *device, int chp)
929 __set_bit(DASD_PATH_NPP, &device->path[chp].flags);
932 static inline int dasd_path_is_nonpreferred(struct dasd_device *device, int chp)
934 return test_bit(DASD_PATH_NPP, &device->path[chp].flags);
937 static inline void dasd_path_clear_nonpreferred(struct dasd_device *device,
940 __clear_bit(DASD_PATH_NPP, &device->path[chp].flags);
943 static inline void dasd_path_preferred(struct dasd_device *device, int chp)
945 __set_bit(DASD_PATH_PP, &device->path[chp].flags);
948 static inline int dasd_path_is_preferred(struct dasd_device *device, int chp)
950 return test_bit(DASD_PATH_PP, &device->path[chp].flags);
953 static inline void dasd_path_clear_preferred(struct dasd_device *device,
956 __clear_bit(DASD_PATH_PP, &device->path[chp].flags);
959 static inline void dasd_path_clear_oper(struct dasd_device *device, int chp)
961 __clear_bit(DASD_PATH_OPERATIONAL, &device->path[chp].flags);
962 device->opm &= ~(0x80 >> chp);
965 static inline void dasd_path_clear_cable(struct dasd_device *device, int chp)
967 __clear_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
970 static inline void dasd_path_cuir(struct dasd_device *device, int chp)
972 __set_bit(DASD_PATH_CUIR, &device->path[chp].flags);
975 static inline int dasd_path_is_cuir(struct dasd_device *device, int chp)
977 return test_bit(DASD_PATH_CUIR, &device->path[chp].flags);
980 static inline void dasd_path_clear_cuir(struct dasd_device *device, int chp)
982 __clear_bit(DASD_PATH_CUIR, &device->path[chp].flags);
985 static inline void dasd_path_ifcc(struct dasd_device *device, int chp)
987 set_bit(DASD_PATH_IFCC, &device->path[chp].flags);
990 static inline int dasd_path_is_ifcc(struct dasd_device *device, int chp)
992 return test_bit(DASD_PATH_IFCC, &device->path[chp].flags);
995 static inline void dasd_path_clear_ifcc(struct dasd_device *device, int chp)
997 clear_bit(DASD_PATH_IFCC, &device->path[chp].flags);
1000 static inline void dasd_path_clear_nohpf(struct dasd_device *device, int chp)
1002 __clear_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1005 static inline void dasd_path_miscabled(struct dasd_device *device, int chp)
1007 __set_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1010 static inline int dasd_path_is_miscabled(struct dasd_device *device, int chp)
1012 return test_bit(DASD_PATH_MISCABLED, &device->path[chp].flags);
1015 static inline void dasd_path_nohpf(struct dasd_device *device, int chp)
1017 __set_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1020 static inline int dasd_path_is_nohpf(struct dasd_device *device, int chp)
1022 return test_bit(DASD_PATH_NOHPF, &device->path[chp].flags);
1026 * get functions for path masks
1027 * will return a path masks for the given device
1030 static inline __u8 dasd_path_get_opm(struct dasd_device *device)
1035 static inline __u8 dasd_path_get_tbvpm(struct dasd_device *device)
1040 for (chp = 0; chp < 8; chp++)
1041 if (dasd_path_need_verify(device, chp))
1042 tbvpm |= 0x80 >> chp;
1046 static inline __u8 dasd_path_get_nppm(struct dasd_device *device)
1051 for (chp = 0; chp < 8; chp++) {
1052 if (dasd_path_is_nonpreferred(device, chp))
1058 static inline __u8 dasd_path_get_ppm(struct dasd_device *device)
1063 for (chp = 0; chp < 8; chp++)
1064 if (dasd_path_is_preferred(device, chp))
1069 static inline __u8 dasd_path_get_cablepm(struct dasd_device *device)
1072 __u8 cablepm = 0x00;
1074 for (chp = 0; chp < 8; chp++)
1075 if (dasd_path_is_miscabled(device, chp))
1076 cablepm |= 0x80 >> chp;
1080 static inline __u8 dasd_path_get_cuirpm(struct dasd_device *device)
1085 for (chp = 0; chp < 8; chp++)
1086 if (dasd_path_is_cuir(device, chp))
1087 cuirpm |= 0x80 >> chp;
1091 static inline __u8 dasd_path_get_ifccpm(struct dasd_device *device)
1096 for (chp = 0; chp < 8; chp++)
1097 if (dasd_path_is_ifcc(device, chp))
1098 ifccpm |= 0x80 >> chp;
1102 static inline __u8 dasd_path_get_hpfpm(struct dasd_device *device)
1107 for (chp = 0; chp < 8; chp++)
1108 if (dasd_path_is_nohpf(device, chp))
1109 hpfpm |= 0x80 >> chp;
1114 * add functions for path masks
1115 * the existing path mask will be extended by the given path mask
1117 static inline void dasd_path_add_tbvpm(struct dasd_device *device, __u8 pm)
1121 for (chp = 0; chp < 8; chp++)
1122 if (pm & (0x80 >> chp))
1123 dasd_path_verify(device, chp);
1126 static inline __u8 dasd_path_get_notoperpm(struct dasd_device *device)
1131 for (chp = 0; chp < 8; chp++)
1132 if (dasd_path_is_nohpf(device, chp) ||
1133 dasd_path_is_ifcc(device, chp) ||
1134 dasd_path_is_cuir(device, chp) ||
1135 dasd_path_is_miscabled(device, chp))
1136 nopm |= 0x80 >> chp;
1140 static inline void dasd_path_add_opm(struct dasd_device *device, __u8 pm)
1144 for (chp = 0; chp < 8; chp++)
1145 if (pm & (0x80 >> chp)) {
1146 dasd_path_operational(device, chp);
1148 * if the path is used
1149 * it should not be in one of the negative lists
1151 dasd_path_clear_nohpf(device, chp);
1152 dasd_path_clear_cuir(device, chp);
1153 dasd_path_clear_cable(device, chp);
1154 dasd_path_clear_ifcc(device, chp);
1158 static inline void dasd_path_add_cablepm(struct dasd_device *device, __u8 pm)
1162 for (chp = 0; chp < 8; chp++)
1163 if (pm & (0x80 >> chp))
1164 dasd_path_miscabled(device, chp);
1167 static inline void dasd_path_add_cuirpm(struct dasd_device *device, __u8 pm)
1171 for (chp = 0; chp < 8; chp++)
1172 if (pm & (0x80 >> chp))
1173 dasd_path_cuir(device, chp);
1176 static inline void dasd_path_add_ifccpm(struct dasd_device *device, __u8 pm)
1180 for (chp = 0; chp < 8; chp++)
1181 if (pm & (0x80 >> chp))
1182 dasd_path_ifcc(device, chp);
1185 static inline void dasd_path_add_nppm(struct dasd_device *device, __u8 pm)
1189 for (chp = 0; chp < 8; chp++)
1190 if (pm & (0x80 >> chp))
1191 dasd_path_nonpreferred(device, chp);
1194 static inline void dasd_path_add_nohpfpm(struct dasd_device *device, __u8 pm)
1198 for (chp = 0; chp < 8; chp++)
1199 if (pm & (0x80 >> chp))
1200 dasd_path_nohpf(device, chp);
1203 static inline void dasd_path_add_ppm(struct dasd_device *device, __u8 pm)
1207 for (chp = 0; chp < 8; chp++)
1208 if (pm & (0x80 >> chp))
1209 dasd_path_preferred(device, chp);
1213 * set functions for path masks
1214 * the existing path mask will be replaced by the given path mask
1216 static inline void dasd_path_set_tbvpm(struct dasd_device *device, __u8 pm)
1220 for (chp = 0; chp < 8; chp++)
1221 if (pm & (0x80 >> chp))
1222 dasd_path_verify(device, chp);
1224 dasd_path_clear_verify(device, chp);
1227 static inline void dasd_path_set_opm(struct dasd_device *device, __u8 pm)
1231 for (chp = 0; chp < 8; chp++) {
1232 dasd_path_clear_oper(device, chp);
1233 if (pm & (0x80 >> chp)) {
1234 dasd_path_operational(device, chp);
1236 * if the path is used
1237 * it should not be in one of the negative lists
1239 dasd_path_clear_nohpf(device, chp);
1240 dasd_path_clear_cuir(device, chp);
1241 dasd_path_clear_cable(device, chp);
1242 dasd_path_clear_ifcc(device, chp);
1248 * remove functions for path masks
1249 * the existing path mask will be cleared with the given path mask
1251 static inline void dasd_path_remove_opm(struct dasd_device *device, __u8 pm)
1255 for (chp = 0; chp < 8; chp++) {
1256 if (pm & (0x80 >> chp))
1257 dasd_path_clear_oper(device, chp);
1262 * add the newly available path to the to be verified pm and remove it from
1263 * normal operation until it is verified
1265 static inline void dasd_path_available(struct dasd_device *device, int chp)
1267 dasd_path_clear_oper(device, chp);
1268 dasd_path_verify(device, chp);
1271 static inline void dasd_path_notoper(struct dasd_device *device, int chp)
1273 dasd_path_clear_oper(device, chp);
1274 dasd_path_clear_preferred(device, chp);
1275 dasd_path_clear_nonpreferred(device, chp);
1279 * remove all paths from normal operation
1281 static inline void dasd_path_no_path(struct dasd_device *device)
1285 for (chp = 0; chp < 8; chp++)
1286 dasd_path_notoper(device, chp);
1288 dasd_path_clear_all_verify(device);
1291 /* end - path handling */