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Horst Hummel138c0142006-06-29 14:58:12 +02001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * File...........: linux/drivers/s390/block/dasd_int.h
3 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
Horst Hummel138c0142006-06-29 14:58:12 +02004 * Horst Hummel <Horst.Hummel@de.ibm.com>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 * Martin Schwidefsky <schwidefsky@de.ibm.com>
6 * Bugreports.to..: <Linux390@de.ibm.com>
Stefan Haberlandd41dd122009-06-16 10:30:25 +02007 * Copyright IBM Corp. 1999, 2009
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 */
9
10#ifndef DASD_INT_H
11#define DASD_INT_H
12
13#ifdef __KERNEL__
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015/* 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.
Horst Hummel90f00942006-03-07 21:55:39 -080024 * unfmt: the device could not be analyzed (format is unknown).
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 * 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
Horst Hummel90f00942006-03-07 21:55:39 -080045#define DASD_STATE_UNFMT 3
46#define DASD_STATE_READY 4
47#define DASD_STATE_ONLINE 5
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49#include <linux/module.h>
50#include <linux/wait.h>
51#include <linux/blkdev.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070052#include <linux/genhd.h>
53#include <linux/hdreg.h>
54#include <linux/interrupt.h>
vignesh babue108ceb2007-10-12 16:11:39 +020055#include <linux/log2.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#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/*
63 * SECTION: Type definitions
64 */
65struct dasd_device;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010066struct dasd_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68/* BIT DEFINITIONS FOR SENSE DATA */
69#define DASD_SENSE_BIT_0 0x80
70#define DASD_SENSE_BIT_1 0x40
71#define DASD_SENSE_BIT_2 0x20
72#define DASD_SENSE_BIT_3 0x10
73
Stefan Haberlandf60c7682008-04-17 07:46:08 +020074/* BIT DEFINITIONS FOR SIM SENSE */
75#define DASD_SIM_SENSE 0x0F
76#define DASD_SIM_MSG_TO_OP 0x03
77#define DASD_SIM_LOG 0x0C
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079/*
80 * SECTION: MACROs for klogd and s390 debug feature (dbf)
81 */
82#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
83do { \
84 debug_sprintf_event(d_device->debug_area, \
85 d_level, \
86 d_str "\n", \
87 d_data); \
88} while(0)
89
90#define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
91do { \
92 debug_sprintf_exception(d_device->debug_area, \
93 d_level, \
94 d_str "\n", \
95 d_data); \
96} while(0)
97
98#define DBF_EVENT(d_level, d_str, d_data...)\
99do { \
100 debug_sprintf_event(dasd_debug_area, \
101 d_level,\
102 d_str "\n", \
103 d_data); \
104} while(0)
105
106#define DBF_EXC(d_level, d_str, d_data...)\
107do { \
108 debug_sprintf_exception(dasd_debug_area, \
109 d_level,\
110 d_str "\n", \
111 d_data); \
112} while(0)
113
Stefan Haberlandfc19f382009-03-26 15:23:49 +0100114/* limit size for an errorstring */
115#define ERRORLENGTH 30
116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117/* definition of dbf debug levels */
118#define DBF_EMERG 0 /* system is unusable */
119#define DBF_ALERT 1 /* action must be taken immediately */
120#define DBF_CRIT 2 /* critical conditions */
121#define DBF_ERR 3 /* error conditions */
122#define DBF_WARNING 4 /* warning conditions */
123#define DBF_NOTICE 5 /* normal but significant condition */
124#define DBF_INFO 6 /* informational */
125#define DBF_DEBUG 6 /* debug-level messages */
126
127/* messages to be written via klogd and dbf */
128#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
129do { \
130 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
Kay Sievers2a0217d2008-10-10 21:33:09 +0200131 dev_name(&d_device->cdev->dev), d_args); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
133} while(0)
134
135#define MESSAGE(d_loglevel,d_string,d_args...)\
136do { \
137 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
138 DBF_EVENT(DBF_ALERT, d_string, d_args); \
139} while(0)
140
141/* messages to be written via klogd only */
142#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
143do { \
144 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
Kay Sievers2a0217d2008-10-10 21:33:09 +0200145 dev_name(&d_device->cdev->dev), d_args); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146} while(0)
147
148#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
149do { \
150 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
151} while(0)
152
153struct dasd_ccw_req {
154 unsigned int magic; /* Eye catcher */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100155 struct list_head devlist; /* for dasd_device request queue */
156 struct list_head blocklist; /* for dasd_block request queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
158 /* Where to execute what... */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100159 struct dasd_block *block; /* the originating block device */
160 struct dasd_device *memdev; /* the device used to allocate this */
161 struct dasd_device *startdev; /* device the request is started on */
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +0100162 void *cpaddr; /* address of ccw or tcw */
163 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100164 char status; /* status of this request */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 short retries; /* A retry counter */
166 unsigned long flags; /* flags of this request */
167
168 /* ... and how */
169 unsigned long starttime; /* jiffies time of request start */
170 int expires; /* expiration period in jiffies */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100171 char lpm; /* logical path mask */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 void *data; /* pointer to data area */
173
174 /* these are important for recovering erroneous requests */
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +0200175 int intrc; /* internal error, e.g. from start_IO */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 struct irb irb; /* device status in case of an error */
177 struct dasd_ccw_req *refers; /* ERP-chain queueing. */
178 void *function; /* originating ERP action */
179
180 /* these are for statistics only */
181 unsigned long long buildclk; /* TOD-clock of request generation */
182 unsigned long long startclk; /* TOD-clock of request start */
183 unsigned long long stopclk; /* TOD-clock of request interrupt */
184 unsigned long long endclk; /* TOD-clock of request termination */
185
186 /* Callback that is called after reaching final status. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100187 void (*callback)(struct dasd_ccw_req *, void *data);
188 void *callback_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189};
190
Horst Hummel138c0142006-06-29 14:58:12 +0200191/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 * dasd_ccw_req -> status can be:
193 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100194#define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
195#define DASD_CQR_DONE 0x01 /* request is completed successfully */
196#define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
197#define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
198#define DASD_CQR_FAILED 0x04 /* request is finally failed */
199#define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
200
201#define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
202#define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
203#define DASD_CQR_ERROR 0x82 /* request is completed with error */
204#define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
205#define DASD_CQR_CLEARED 0x84 /* request was cleared */
Coly Li73ac36e2009-01-07 18:09:16 -0800206#define DASD_CQR_SUCCESS 0x85 /* request was successful */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100207
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209/* per dasd_ccw_req flags */
210#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
Horst Hummel1c01b8a2006-01-06 00:19:15 -0800211#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213/* Signature for error recovery functions. */
214typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
215
216/*
217 * the struct dasd_discipline is
218 * sth like a table of virtual functions, if you think of dasd_eckd
219 * inheriting dasd...
220 * no, currently we are not planning to reimplement the driver in C++
221 */
222struct dasd_discipline {
223 struct module *owner;
224 char ebcname[8]; /* a name used for tagging and printks */
225 char name[8]; /* a name used for tagging and printks */
226 int max_blocks; /* maximum number of blocks to be chained */
227
228 struct list_head list; /* used for list of disciplines */
229
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100230 /*
231 * Device recognition functions. check_device is used to verify
232 * the sense data and the information returned by read device
233 * characteristics. It returns 0 if the discipline can be used
234 * for the device in question. uncheck_device is called during
235 * device shutdown to deregister a device from its discipline.
236 */
237 int (*check_device) (struct dasd_device *);
238 void (*uncheck_device) (struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100240 /*
241 * do_analysis is used in the step from device state "basic" to
242 * state "accept". It returns 0 if the device can be made ready,
243 * it returns -EMEDIUMTYPE if the device can't be made ready or
244 * -EAGAIN if do_analysis started a ccw that needs to complete
245 * before the analysis may be repeated.
246 */
247 int (*do_analysis) (struct dasd_block *);
248
249 /*
250 * Last things to do when a device is set online, and first things
251 * when it is set offline.
252 */
253 int (*ready_to_online) (struct dasd_device *);
254 int (*online_to_ready) (struct dasd_device *);
255
256 /*
257 * Device operation functions. build_cp creates a ccw chain for
258 * a block device request, start_io starts the request and
259 * term_IO cancels it (e.g. in case of a timeout). format_device
260 * returns a ccw chain to be used to format the device.
261 * handle_terminated_request allows to examine a cqr and prepare
262 * it for retry.
263 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100265 struct dasd_block *,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 struct request *);
267 int (*start_IO) (struct dasd_ccw_req *);
268 int (*term_IO) (struct dasd_ccw_req *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100269 void (*handle_terminated_request) (struct dasd_ccw_req *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 struct dasd_ccw_req *(*format_device) (struct dasd_device *,
271 struct format_data_t *);
272 int (*free_cp) (struct dasd_ccw_req *, struct request *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100273
274 /*
275 * Error recovery functions. examine_error() returns a value that
276 * indicates what to do for an error condition. If examine_error()
Horst Hummel138c0142006-06-29 14:58:12 +0200277 * returns 'dasd_era_recover' erp_action() is called to create a
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100278 * special error recovery ccw. erp_postaction() is called after
279 * an error recovery ccw has finished its execution. dump_sense
280 * is called for every error condition to print the sense data
281 * to the console.
282 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
284 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
285 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
286 struct irb *);
Stefan Haberlandaeec92c2009-07-07 16:37:06 +0200287 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100289 void (*handle_unsolicited_interrupt) (struct dasd_device *,
290 struct irb *);
291
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 /* i/o control functions. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100293 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100295 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200296
297 /* suspend/resume functions */
298 int (*freeze) (struct dasd_device *);
299 int (*restore) (struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300};
301
302extern struct dasd_discipline *dasd_diag_discipline_pointer;
303
Horst Hummel3d052592006-04-27 18:40:28 -0700304/*
305 * Unique identifier for dasd device.
306 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100307#define UA_NOT_CONFIGURED 0x00
308#define UA_BASE_DEVICE 0x01
309#define UA_BASE_PAV_ALIAS 0x02
310#define UA_HYPER_PAV_ALIAS 0x03
311
Horst Hummel3d052592006-04-27 18:40:28 -0700312struct dasd_uid {
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100313 __u8 type;
Horst Hummel3d052592006-04-27 18:40:28 -0700314 char vendor[4];
315 char serial[15];
316 __u16 ssid;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100317 __u8 real_unit_addr;
318 __u8 base_unit_addr;
Stefan Weinhuber4abb08c2008-08-01 16:39:09 +0200319 char vduit[33];
Horst Hummel3d052592006-04-27 18:40:28 -0700320};
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800321
322/*
323 * Notification numbers for extended error reporting notifications:
324 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
325 * eer pointer) is freed. The error reporting module needs to do all necessary
326 * cleanup steps.
327 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
328 */
329#define DASD_EER_DISABLE 0
330#define DASD_EER_TRIGGER 1
331
332/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
333#define DASD_EER_FATALERROR 1
334#define DASD_EER_NOPATH 2
335#define DASD_EER_STATECHANGE 3
336#define DASD_EER_PPRCSUSPEND 4
337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338struct dasd_device {
339 /* Block device stuff. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100340 struct dasd_block *block;
341
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 unsigned int devindex;
Horst Hummel138c0142006-06-29 14:58:12 +0200343 unsigned long flags; /* per device flags */
344 unsigned short features; /* copy of devmap-features (read-only!) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800346 /* extended error reporting stuff (eer) */
347 struct dasd_ccw_req *eer_cqr;
348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 /* Device discipline stuff. */
350 struct dasd_discipline *discipline;
Peter Oberparleiteraa888612006-02-20 18:28:13 -0800351 struct dasd_discipline *base_discipline;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 char *private;
353
354 /* Device state and target state. */
355 int state, target;
356 int stopped; /* device (ccw_device_start) was stopped */
357
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100358 /* reference count. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 atomic_t ref_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
361 /* ccw queue and memory for static ccw/erp buffers. */
362 struct list_head ccw_queue;
363 spinlock_t mem_lock;
364 void *ccw_mem;
365 void *erp_mem;
366 struct list_head ccw_chunks;
367 struct list_head erp_chunks;
368
369 atomic_t tasklet_scheduled;
370 struct tasklet_struct tasklet;
371 struct work_struct kick_work;
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200372 struct work_struct restore_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 struct timer_list timer;
374
375 debug_info_t *debug_area;
376
377 struct ccw_device *cdev;
378
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100379 /* hook for alias management */
380 struct list_head alias_list;
381};
382
383struct dasd_block {
384 /* Block device stuff. */
385 struct gendisk *gdp;
386 struct request_queue *request_queue;
387 spinlock_t request_queue_lock;
388 struct block_device *bdev;
389 atomic_t open_count;
390
Stefan Weinhuberb44b0ab32009-03-26 15:23:47 +0100391 unsigned long long blocks; /* size of volume in blocks */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100392 unsigned int bp_block; /* bytes per block */
393 unsigned int s2b_shift; /* log2 (bp_block/512) */
394
395 struct dasd_device *base;
396 struct list_head ccw_queue;
397 spinlock_t queue_lock;
398
399 atomic_t tasklet_scheduled;
400 struct tasklet_struct tasklet;
401 struct timer_list timer;
402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403#ifdef CONFIG_DASD_PROFILE
404 struct dasd_profile_info_t profile;
405#endif
406};
407
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100408
409
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410/* reasons why device (ccw_device_start) was stopped */
411#define DASD_STOPPED_NOT_ACC 1 /* not accessible */
412#define DASD_STOPPED_QUIESCE 2 /* Quiesced */
413#define DASD_STOPPED_PENDING 4 /* long busy */
414#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100415#define DASD_STOPPED_SU 16 /* summary unit check handling */
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200416#define DASD_STOPPED_PM 32 /* pm state transition */
417#define DASD_UNRESUMED_PM 64 /* pm resume failed state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419/* per device flags */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800421#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
422#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424void dasd_put_device_wake(struct dasd_device *);
425
426/*
427 * Reference count inliners
428 */
429static inline void
430dasd_get_device(struct dasd_device *device)
431{
432 atomic_inc(&device->ref_count);
433}
434
435static inline void
436dasd_put_device(struct dasd_device *device)
437{
438 if (atomic_dec_return(&device->ref_count) == 0)
439 dasd_put_device_wake(device);
440}
441
442/*
443 * The static memory in ccw_mem and erp_mem is managed by a sorted
444 * list of free memory chunks.
445 */
446struct dasd_mchunk
447{
448 struct list_head list;
449 unsigned long size;
450} __attribute__ ((aligned(8)));
451
452static inline void
453dasd_init_chunklist(struct list_head *chunk_list, void *mem,
454 unsigned long size)
455{
456 struct dasd_mchunk *chunk;
457
458 INIT_LIST_HEAD(chunk_list);
459 chunk = (struct dasd_mchunk *) mem;
460 chunk->size = size - sizeof(struct dasd_mchunk);
461 list_add(&chunk->list, chunk_list);
462}
463
464static inline void *
465dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
466{
467 struct dasd_mchunk *chunk, *tmp;
468
469 size = (size + 7L) & -8L;
470 list_for_each_entry(chunk, chunk_list, list) {
471 if (chunk->size < size)
472 continue;
473 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
474 char *endaddr = (char *) (chunk + 1) + chunk->size;
475 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
476 tmp->size = size;
477 chunk->size -= size + sizeof(struct dasd_mchunk);
478 chunk = tmp;
479 } else
480 list_del(&chunk->list);
481 return (void *) (chunk + 1);
482 }
483 return NULL;
484}
485
486static inline void
487dasd_free_chunk(struct list_head *chunk_list, void *mem)
488{
489 struct dasd_mchunk *chunk, *tmp;
490 struct list_head *p, *left;
491
492 chunk = (struct dasd_mchunk *)
493 ((char *) mem - sizeof(struct dasd_mchunk));
494 /* Find out the left neighbour in chunk_list. */
495 left = chunk_list;
496 list_for_each(p, chunk_list) {
497 if (list_entry(p, struct dasd_mchunk, list) > chunk)
498 break;
499 left = p;
500 }
501 /* Try to merge with right neighbour = next element from left. */
502 if (left->next != chunk_list) {
503 tmp = list_entry(left->next, struct dasd_mchunk, list);
504 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
505 list_del(&tmp->list);
506 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
507 }
508 }
509 /* Try to merge with left neighbour. */
510 if (left != chunk_list) {
511 tmp = list_entry(left, struct dasd_mchunk, list);
512 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
513 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
514 return;
515 }
516 }
517 __list_add(&chunk->list, left, left->next);
518}
519
520/*
521 * Check if bsize is in { 512, 1024, 2048, 4096 }
522 */
523static inline int
524dasd_check_blocksize(int bsize)
525{
vignesh babue108ceb2007-10-12 16:11:39 +0200526 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 return -EMEDIUMTYPE;
528 return 0;
529}
530
531/* externals in dasd.c */
532#define DASD_PROFILE_ON 1
533#define DASD_PROFILE_OFF 0
534
535extern debug_info_t *dasd_debug_area;
536extern struct dasd_profile_info_t dasd_global_profile;
537extern unsigned int dasd_profile_level;
538extern struct block_device_operations dasd_device_operations;
539
Christoph Lametere18b8902006-12-06 20:33:20 -0800540extern struct kmem_cache *dasd_page_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541
542struct dasd_ccw_req *
543dasd_kmalloc_request(char *, int, int, struct dasd_device *);
544struct dasd_ccw_req *
545dasd_smalloc_request(char *, int, int, struct dasd_device *);
546void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
547void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
548
549static inline int
550dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
551{
552 return set_normalized_cda(ccw, cda);
553}
554
555struct dasd_device *dasd_alloc_device(void);
556void dasd_free_device(struct dasd_device *);
557
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100558struct dasd_block *dasd_alloc_block(void);
559void dasd_free_block(struct dasd_block *);
560
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561void dasd_enable_device(struct dasd_device *);
562void dasd_set_target_state(struct dasd_device *, int);
563void dasd_kick_device(struct dasd_device *);
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200564void dasd_restore_device(struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566void dasd_add_request_head(struct dasd_ccw_req *);
567void dasd_add_request_tail(struct dasd_ccw_req *);
568int dasd_start_IO(struct dasd_ccw_req *);
569int dasd_term_IO(struct dasd_ccw_req *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100570void dasd_schedule_device_bh(struct dasd_device *);
571void dasd_schedule_block_bh(struct dasd_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572int dasd_sleep_on(struct dasd_ccw_req *);
573int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
574int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100575void dasd_device_set_timer(struct dasd_device *, int);
576void dasd_device_clear_timer(struct dasd_device *);
577void dasd_block_set_timer(struct dasd_block *, int);
578void dasd_block_clear_timer(struct dasd_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579int dasd_cancel_req(struct dasd_ccw_req *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100580int dasd_flush_device_queue(struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
582void dasd_generic_remove (struct ccw_device *cdev);
583int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
584int dasd_generic_set_offline (struct ccw_device *cdev);
585int dasd_generic_notify(struct ccw_device *, int);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100586void dasd_generic_handle_state_change(struct dasd_device *);
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200587int dasd_generic_pm_freeze(struct ccw_device *);
588int dasd_generic_restore_device(struct ccw_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
Sebastian Ott92636b12009-06-12 10:26:37 +0200590int dasd_generic_read_dev_chars(struct dasd_device *, char *, void *, int);
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +0100591char *dasd_get_sense(struct irb *);
Cornelia Huck17283b52007-05-04 18:47:51 +0200592
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593/* externals in dasd_devmap.c */
594extern int dasd_max_devindex;
595extern int dasd_probeonly;
596extern int dasd_autodetect;
Horst Hummel40545572006-06-29 15:08:18 +0200597extern int dasd_nopav;
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +0100598extern int dasd_nofcx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600int dasd_devmap_init(void);
601void dasd_devmap_exit(void);
602
603struct dasd_device *dasd_create_device(struct ccw_device *);
604void dasd_delete_device(struct dasd_device *);
605
Horst Hummel3d052592006-04-27 18:40:28 -0700606int dasd_get_uid(struct ccw_device *, struct dasd_uid *);
607int dasd_set_uid(struct ccw_device *, struct dasd_uid *);
Horst Hummelf24acd42005-05-01 08:58:59 -0700608int dasd_get_feature(struct ccw_device *, int);
609int dasd_set_feature(struct ccw_device *, int, int);
610
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611int dasd_add_sysfs_files(struct ccw_device *);
612void dasd_remove_sysfs_files(struct ccw_device *);
613
614struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
Martin Schwidefskya00bfd72006-09-20 15:59:05 +0200615struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616struct dasd_device *dasd_device_from_devindex(int);
617
618int dasd_parse(void);
Cornelia Huck69f90f62008-05-15 16:52:34 +0200619int dasd_busid_known(const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
621/* externals in dasd_gendisk.c */
622int dasd_gendisk_init(void);
623void dasd_gendisk_exit(void);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100624int dasd_gendisk_alloc(struct dasd_block *);
625void dasd_gendisk_free(struct dasd_block *);
626int dasd_scan_partitions(struct dasd_block *);
627void dasd_destroy_partitions(struct dasd_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628
629/* externals in dasd_ioctl.c */
Al Viro57a7c0b2008-03-02 10:36:08 -0500630int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
632/* externals in dasd_proc.c */
633int dasd_proc_init(void);
634void dasd_proc_exit(void);
635
636/* externals in dasd_erp.c */
637struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
638struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
639struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
640 struct dasd_device *);
641void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
642void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
Stefan Haberlandfc19f382009-03-26 15:23:49 +0100643void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645/* externals in dasd_3990_erp.c */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
Stefan Haberlandf60c7682008-04-17 07:46:08 +0200647void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800649/* externals in dasd_eer.c */
650#ifdef CONFIG_DASD_EER
651int dasd_eer_init(void);
652void dasd_eer_exit(void);
653int dasd_eer_enable(struct dasd_device *);
654void dasd_eer_disable(struct dasd_device *);
655void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
656 unsigned int id);
657void dasd_eer_snss(struct dasd_device *);
658
659static inline int dasd_eer_enabled(struct dasd_device *device)
660{
661 return device->eer_cqr != NULL;
662}
663#else
664#define dasd_eer_init() (0)
665#define dasd_eer_exit() do { } while (0)
666#define dasd_eer_enable(d) (0)
667#define dasd_eer_disable(d) do { } while (0)
668#define dasd_eer_write(d,c,i) do { } while (0)
669#define dasd_eer_snss(d) do { } while (0)
670#define dasd_eer_enabled(d) (0)
671#endif /* CONFIG_DASD_ERR */
672
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673#endif /* __KERNEL__ */
674
675#endif /* DASD_H */