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 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
17 /* erp debugging in dasd.c and dasd_3990_erp.c */
21 /* we keep old device allocation scheme; IOW, minors are still in 0..255 */
22 #define DASD_PER_MAJOR (1U << (MINORBITS - DASD_PARTN_BITS))
23 #define DASD_PARTN_MASK ((1 << DASD_PARTN_BITS) - 1)
26 * States a dasd device can have:
27 * new: the dasd_device structure is allocated.
28 * known: the discipline for the device is identified.
29 * basic: the device can do basic i/o.
30 * accept: the device is analysed (format is known).
31 * ready: partition detection is done and the device is can do block io.
32 * online: the device accepts requests from the block device queue.
34 * Things to do for startup state transitions:
35 * new -> known: find discipline for the device and create devfs entries.
36 * known -> basic: request irq line for the device.
37 * basic -> ready: do the initial analysis, e.g. format detection,
38 * do block device setup and detect partitions.
39 * ready -> online: schedule the device tasklet.
40 * Things to do for shutdown state transitions:
41 * online -> ready: just set the new device state.
42 * ready -> basic: flush requests from the block device layer, clear
43 * partition information and reset format information.
44 * basic -> known: terminate all requests and free irq.
45 * known -> new: remove devfs entries and forget discipline.
48 #define DASD_STATE_NEW 0
49 #define DASD_STATE_KNOWN 1
50 #define DASD_STATE_BASIC 2
51 #define DASD_STATE_READY 3
52 #define DASD_STATE_ONLINE 4
54 #include <linux/module.h>
55 #include <linux/wait.h>
56 #include <linux/blkdev.h>
57 #include <linux/devfs_fs_kernel.h>
58 #include <linux/genhd.h>
59 #include <linux/hdreg.h>
60 #include <linux/interrupt.h>
61 #include <asm/ccwdev.h>
62 #include <linux/workqueue.h>
63 #include <asm/debug.h>
65 #include <asm/idals.h>
68 * SECTION: Type definitions
72 typedef int (*dasd_ioctl_fn_t) (struct block_device *bdev, int no, long args);
75 struct list_head list;
78 dasd_ioctl_fn_t handler;
82 dasd_era_fatal = -1, /* no chance to recover */
83 dasd_era_none = 0, /* don't recover, everything alright */
84 dasd_era_msg = 1, /* don't recover, just report... */
85 dasd_era_recover = 2 /* recovery action recommended */
88 /* BIT DEFINITIONS FOR SENSE DATA */
89 #define DASD_SENSE_BIT_0 0x80
90 #define DASD_SENSE_BIT_1 0x40
91 #define DASD_SENSE_BIT_2 0x20
92 #define DASD_SENSE_BIT_3 0x10
95 * SECTION: MACROs for klogd and s390 debug feature (dbf)
97 #define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
99 debug_sprintf_event(d_device->debug_area, \
105 #define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
107 debug_sprintf_exception(d_device->debug_area, \
113 #define DBF_EVENT(d_level, d_str, d_data...)\
115 debug_sprintf_event(dasd_debug_area, \
121 #define DBF_EXC(d_level, d_str, d_data...)\
123 debug_sprintf_exception(dasd_debug_area, \
129 /* definition of dbf debug levels */
130 #define DBF_EMERG 0 /* system is unusable */
131 #define DBF_ALERT 1 /* action must be taken immediately */
132 #define DBF_CRIT 2 /* critical conditions */
133 #define DBF_ERR 3 /* error conditions */
134 #define DBF_WARNING 4 /* warning conditions */
135 #define DBF_NOTICE 5 /* normal but significant condition */
136 #define DBF_INFO 6 /* informational */
137 #define DBF_DEBUG 6 /* debug-level messages */
139 /* messages to be written via klogd and dbf */
140 #define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
142 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
143 d_device->cdev->dev.bus_id, d_args); \
144 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
147 #define MESSAGE(d_loglevel,d_string,d_args...)\
149 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
150 DBF_EVENT(DBF_ALERT, d_string, d_args); \
153 struct dasd_ccw_req {
154 unsigned int magic; /* Eye catcher */
155 struct list_head list; /* list_head for request queueing. */
157 /* Where to execute what... */
158 struct dasd_device *device; /* device the request is for */
159 struct ccw1 *cpaddr; /* address of channel program */
160 char status; /* status of this request */
161 short retries; /* A retry counter */
162 unsigned long flags; /* flags of this request */
165 unsigned long starttime; /* jiffies time of request start */
166 int expires; /* expiration period in jiffies */
167 char lpm; /* logical path mask */
168 void *data; /* pointer to data area */
170 /* these are important for recovering erroneous requests */
171 struct irb irb; /* device status in case of an error */
172 struct dasd_ccw_req *refers; /* ERP-chain queueing. */
173 void *function; /* originating ERP action */
175 /* these are for statistics only */
176 unsigned long long buildclk; /* TOD-clock of request generation */
177 unsigned long long startclk; /* TOD-clock of request start */
178 unsigned long long stopclk; /* TOD-clock of request interrupt */
179 unsigned long long endclk; /* TOD-clock of request termination */
181 /* Callback that is called after reaching final status. */
182 void (*callback)(struct dasd_ccw_req *, void *data);
187 * dasd_ccw_req -> status can be:
189 #define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
190 #define DASD_CQR_QUEUED 0x01 /* request is queued to be processed */
191 #define DASD_CQR_IN_IO 0x02 /* request is currently in IO */
192 #define DASD_CQR_DONE 0x03 /* request is completed successfully */
193 #define DASD_CQR_ERROR 0x04 /* request is completed with error */
194 #define DASD_CQR_FAILED 0x05 /* request is finally failed */
195 #define DASD_CQR_CLEAR 0x06 /* request is clear pending */
197 /* per dasd_ccw_req flags */
198 #define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
200 /* Signature for error recovery functions. */
201 typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
204 * the struct dasd_discipline is
205 * sth like a table of virtual functions, if you think of dasd_eckd
207 * no, currently we are not planning to reimplement the driver in C++
209 struct dasd_discipline {
210 struct module *owner;
211 char ebcname[8]; /* a name used for tagging and printks */
212 char name[8]; /* a name used for tagging and printks */
213 int max_blocks; /* maximum number of blocks to be chained */
215 struct list_head list; /* used for list of disciplines */
218 * Device recognition functions. check_device is used to verify
219 * the sense data and the information returned by read device
220 * characteristics. It returns 0 if the discipline can be used
221 * for the device in question.
222 * do_analysis is used in the step from device state "basic" to
223 * state "accept". It returns 0 if the device can be made ready,
224 * it returns -EMEDIUMTYPE if the device can't be made ready or
225 * -EAGAIN if do_analysis started a ccw that needs to complete
226 * before the analysis may be repeated.
228 int (*check_device)(struct dasd_device *);
229 int (*do_analysis) (struct dasd_device *);
232 * Device operation functions. build_cp creates a ccw chain for
233 * a block device request, start_io starts the request and
234 * term_IO cancels it (e.g. in case of a timeout). format_device
235 * returns a ccw chain to be used to format the device.
237 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
239 int (*start_IO) (struct dasd_ccw_req *);
240 int (*term_IO) (struct dasd_ccw_req *);
241 struct dasd_ccw_req *(*format_device) (struct dasd_device *,
242 struct format_data_t *);
243 int (*free_cp) (struct dasd_ccw_req *, struct request *);
245 * Error recovery functions. examine_error() returns a value that
246 * indicates what to do for an error condition. If examine_error()
247 * returns 'dasd_era_recover' erp_action() is called to create a
248 * special error recovery ccw. erp_postaction() is called after
249 * an error recovery ccw has finished its execution. dump_sense
250 * is called for every error condition to print the sense data
253 dasd_era_t(*examine_error) (struct dasd_ccw_req *, struct irb *);
254 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
255 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
256 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
259 /* i/o control functions. */
260 int (*fill_geometry) (struct dasd_device *, struct hd_geometry *);
261 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
264 extern struct dasd_discipline *dasd_diag_discipline_pointer;
267 /* Block device stuff. */
269 request_queue_t *request_queue;
270 spinlock_t request_queue_lock;
271 struct block_device *bdev;
272 unsigned int devindex;
273 unsigned long blocks; /* size of volume in blocks */
274 unsigned int bp_block; /* bytes per block */
275 unsigned int s2b_shift; /* log2 (bp_block/512) */
276 unsigned long flags; /* per device flags */
278 /* Device discipline stuff. */
279 struct dasd_discipline *discipline;
282 /* Device state and target state. */
284 int stopped; /* device (ccw_device_start) was stopped */
286 /* Open and reference count. */
290 /* ccw queue and memory for static ccw/erp buffers. */
291 struct list_head ccw_queue;
295 struct list_head ccw_chunks;
296 struct list_head erp_chunks;
298 atomic_t tasklet_scheduled;
299 struct tasklet_struct tasklet;
300 struct work_struct kick_work;
301 struct timer_list timer;
303 debug_info_t *debug_area;
305 struct ccw_device *cdev;
307 #ifdef CONFIG_DASD_PROFILE
308 struct dasd_profile_info_t profile;
312 /* reasons why device (ccw_device_start) was stopped */
313 #define DASD_STOPPED_NOT_ACC 1 /* not accessible */
314 #define DASD_STOPPED_QUIESCE 2 /* Quiesced */
315 #define DASD_STOPPED_PENDING 4 /* long busy */
316 #define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
317 #define DASD_STOPPED_DC_EIO 16 /* disconnected, return -EIO */
319 /* per device flags */
320 #define DASD_FLAG_RO 0 /* device is read-only */
321 #define DASD_FLAG_USE_DIAG 1 /* use diag disciplnie */
322 #define DASD_FLAG_DSC_ERROR 2 /* return -EIO when disconnected */
323 #define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
325 void dasd_put_device_wake(struct dasd_device *);
328 * Reference count inliners
331 dasd_get_device(struct dasd_device *device)
333 atomic_inc(&device->ref_count);
337 dasd_put_device(struct dasd_device *device)
339 if (atomic_dec_return(&device->ref_count) == 0)
340 dasd_put_device_wake(device);
344 * The static memory in ccw_mem and erp_mem is managed by a sorted
345 * list of free memory chunks.
349 struct list_head list;
351 } __attribute__ ((aligned(8)));
354 dasd_init_chunklist(struct list_head *chunk_list, void *mem,
357 struct dasd_mchunk *chunk;
359 INIT_LIST_HEAD(chunk_list);
360 chunk = (struct dasd_mchunk *) mem;
361 chunk->size = size - sizeof(struct dasd_mchunk);
362 list_add(&chunk->list, chunk_list);
366 dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
368 struct dasd_mchunk *chunk, *tmp;
370 size = (size + 7L) & -8L;
371 list_for_each_entry(chunk, chunk_list, list) {
372 if (chunk->size < size)
374 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
375 char *endaddr = (char *) (chunk + 1) + chunk->size;
376 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
378 chunk->size -= size + sizeof(struct dasd_mchunk);
381 list_del(&chunk->list);
382 return (void *) (chunk + 1);
388 dasd_free_chunk(struct list_head *chunk_list, void *mem)
390 struct dasd_mchunk *chunk, *tmp;
391 struct list_head *p, *left;
393 chunk = (struct dasd_mchunk *)
394 ((char *) mem - sizeof(struct dasd_mchunk));
395 /* Find out the left neighbour in chunk_list. */
397 list_for_each(p, chunk_list) {
398 if (list_entry(p, struct dasd_mchunk, list) > chunk)
402 /* Try to merge with right neighbour = next element from left. */
403 if (left->next != chunk_list) {
404 tmp = list_entry(left->next, struct dasd_mchunk, list);
405 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
406 list_del(&tmp->list);
407 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
410 /* Try to merge with left neighbour. */
411 if (left != chunk_list) {
412 tmp = list_entry(left, struct dasd_mchunk, list);
413 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
414 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
418 __list_add(&chunk->list, left, left->next);
422 * Check if bsize is in { 512, 1024, 2048, 4096 }
425 dasd_check_blocksize(int bsize)
427 if (bsize < 512 || bsize > 4096 || (bsize & (bsize - 1)) != 0)
432 /* externals in dasd.c */
433 #define DASD_PROFILE_ON 1
434 #define DASD_PROFILE_OFF 0
436 extern debug_info_t *dasd_debug_area;
437 extern struct dasd_profile_info_t dasd_global_profile;
438 extern unsigned int dasd_profile_level;
439 extern struct block_device_operations dasd_device_operations;
441 extern kmem_cache_t *dasd_page_cache;
443 struct dasd_ccw_req *
444 dasd_kmalloc_request(char *, int, int, struct dasd_device *);
445 struct dasd_ccw_req *
446 dasd_smalloc_request(char *, int, int, struct dasd_device *);
447 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
448 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
451 dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
453 return set_normalized_cda(ccw, cda);
456 struct dasd_device *dasd_alloc_device(void);
457 void dasd_free_device(struct dasd_device *);
459 void dasd_enable_device(struct dasd_device *);
460 void dasd_set_target_state(struct dasd_device *, int);
461 void dasd_kick_device(struct dasd_device *);
463 void dasd_add_request_head(struct dasd_ccw_req *);
464 void dasd_add_request_tail(struct dasd_ccw_req *);
465 int dasd_start_IO(struct dasd_ccw_req *);
466 int dasd_term_IO(struct dasd_ccw_req *);
467 void dasd_schedule_bh(struct dasd_device *);
468 int dasd_sleep_on(struct dasd_ccw_req *);
469 int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
470 int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
471 void dasd_set_timer(struct dasd_device *, int);
472 void dasd_clear_timer(struct dasd_device *);
473 int dasd_cancel_req(struct dasd_ccw_req *);
474 int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
475 void dasd_generic_remove (struct ccw_device *cdev);
476 int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
477 int dasd_generic_set_offline (struct ccw_device *cdev);
478 int dasd_generic_notify(struct ccw_device *, int);
479 void dasd_generic_auto_online (struct ccw_driver *);
481 /* externals in dasd_devmap.c */
482 extern int dasd_max_devindex;
483 extern int dasd_probeonly;
484 extern int dasd_autodetect;
486 int dasd_devmap_init(void);
487 void dasd_devmap_exit(void);
489 struct dasd_device *dasd_create_device(struct ccw_device *);
490 void dasd_delete_device(struct dasd_device *);
492 int dasd_add_sysfs_files(struct ccw_device *);
493 void dasd_remove_sysfs_files(struct ccw_device *);
495 struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
496 struct dasd_device *dasd_device_from_devindex(int);
498 int dasd_parse(void);
499 int dasd_busid_known(char *);
501 /* externals in dasd_gendisk.c */
502 int dasd_gendisk_init(void);
503 void dasd_gendisk_exit(void);
504 int dasd_gendisk_alloc(struct dasd_device *);
505 void dasd_gendisk_free(struct dasd_device *);
506 int dasd_scan_partitions(struct dasd_device *);
507 void dasd_destroy_partitions(struct dasd_device *);
509 /* externals in dasd_ioctl.c */
510 int dasd_ioctl_init(void);
511 void dasd_ioctl_exit(void);
512 int dasd_ioctl_no_register(struct module *, int, dasd_ioctl_fn_t);
513 int dasd_ioctl_no_unregister(struct module *, int, dasd_ioctl_fn_t);
514 int dasd_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
516 /* externals in dasd_proc.c */
517 int dasd_proc_init(void);
518 void dasd_proc_exit(void);
520 /* externals in dasd_erp.c */
521 struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
522 struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
523 struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int, struct dasd_device *);
524 void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
525 void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
526 void dasd_log_ccw(struct dasd_ccw_req *, int, __u32);
528 /* externals in dasd_3370_erp.c */
529 dasd_era_t dasd_3370_erp_examine(struct dasd_ccw_req *, struct irb *);
531 /* externals in dasd_3990_erp.c */
532 dasd_era_t dasd_3990_erp_examine(struct dasd_ccw_req *, struct irb *);
533 struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
535 /* externals in dasd_9336_erp.c */
536 dasd_era_t dasd_9336_erp_examine(struct dasd_ccw_req *, struct irb *);
538 /* externals in dasd_9336_erp.c */
539 dasd_era_t dasd_9343_erp_examine(struct dasd_ccw_req *, struct irb *);
540 struct dasd_ccw_req *dasd_9343_erp_action(struct dasd_ccw_req *);
542 #endif /* __KERNEL__ */
547 * Overrides for Emacs so that we follow Linus's tabbing style.
548 * Emacs will notice this stuff at the end of the file and automatically
549 * adjust the settings for this buffer only. This must remain at the end
551 * ---------------------------------------------------------------------------
554 * c-brace-imaginary-offset: 0
556 * c-argdecl-indent: 4
558 * c-continued-statement-offset: 4
559 * c-continued-brace-offset: 0
560 * indent-tabs-mode: 1