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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
Stefan Haberland68b781f2009-09-11 10:28:29 +020062/* DASD discipline magic */
63#define DASD_ECKD_MAGIC 0xC5C3D2C4
64#define DASD_DIAG_MAGIC 0xC4C9C1C7
65#define DASD_FBA_MAGIC 0xC6C2C140
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067/*
68 * SECTION: Type definitions
69 */
70struct dasd_device;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +010071struct dasd_block;
Linus Torvalds1da177e2005-04-16 15:20:36 -070072
73/* BIT DEFINITIONS FOR SENSE DATA */
74#define DASD_SENSE_BIT_0 0x80
75#define DASD_SENSE_BIT_1 0x40
76#define DASD_SENSE_BIT_2 0x20
77#define DASD_SENSE_BIT_3 0x10
78
Stefan Haberlandf60c7682008-04-17 07:46:08 +020079/* BIT DEFINITIONS FOR SIM SENSE */
80#define DASD_SIM_SENSE 0x0F
81#define DASD_SIM_MSG_TO_OP 0x03
82#define DASD_SIM_LOG 0x0C
83
Stefan Haberland2dedf0d2010-05-17 10:00:11 +020084/* lock class for nested cdev lock */
85#define CDEV_NESTED_FIRST 1
86#define CDEV_NESTED_SECOND 2
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088/*
89 * SECTION: MACROs for klogd and s390 debug feature (dbf)
90 */
91#define DBF_DEV_EVENT(d_level, d_device, d_str, d_data...) \
92do { \
93 debug_sprintf_event(d_device->debug_area, \
94 d_level, \
95 d_str "\n", \
96 d_data); \
97} while(0)
98
99#define DBF_DEV_EXC(d_level, d_device, d_str, d_data...) \
100do { \
101 debug_sprintf_exception(d_device->debug_area, \
102 d_level, \
103 d_str "\n", \
104 d_data); \
105} while(0)
106
107#define DBF_EVENT(d_level, d_str, d_data...)\
108do { \
109 debug_sprintf_event(dasd_debug_area, \
110 d_level,\
111 d_str "\n", \
112 d_data); \
113} while(0)
114
Stefan Haberlandb8ed5dd2009-12-07 12:51:52 +0100115#define DBF_EVENT_DEVID(d_level, d_cdev, d_str, d_data...) \
116do { \
117 struct ccw_dev_id __dev_id; \
118 ccw_device_get_id(d_cdev, &__dev_id); \
119 debug_sprintf_event(dasd_debug_area, \
120 d_level, \
121 "0.%x.%04x " d_str "\n", \
122 __dev_id.ssid, __dev_id.devno, d_data); \
123} while (0)
124
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125#define DBF_EXC(d_level, d_str, d_data...)\
126do { \
127 debug_sprintf_exception(dasd_debug_area, \
128 d_level,\
129 d_str "\n", \
130 d_data); \
131} while(0)
132
Stefan Haberlandfc19f382009-03-26 15:23:49 +0100133/* limit size for an errorstring */
134#define ERRORLENGTH 30
135
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136/* definition of dbf debug levels */
137#define DBF_EMERG 0 /* system is unusable */
138#define DBF_ALERT 1 /* action must be taken immediately */
139#define DBF_CRIT 2 /* critical conditions */
140#define DBF_ERR 3 /* error conditions */
141#define DBF_WARNING 4 /* warning conditions */
142#define DBF_NOTICE 5 /* normal but significant condition */
143#define DBF_INFO 6 /* informational */
144#define DBF_DEBUG 6 /* debug-level messages */
145
146/* messages to be written via klogd and dbf */
147#define DEV_MESSAGE(d_loglevel,d_device,d_string,d_args...)\
148do { \
149 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
Kay Sievers2a0217d2008-10-10 21:33:09 +0200150 dev_name(&d_device->cdev->dev), d_args); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 DBF_DEV_EVENT(DBF_ALERT, d_device, d_string, d_args); \
152} while(0)
153
154#define MESSAGE(d_loglevel,d_string,d_args...)\
155do { \
156 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
157 DBF_EVENT(DBF_ALERT, d_string, d_args); \
158} while(0)
159
160/* messages to be written via klogd only */
161#define DEV_MESSAGE_LOG(d_loglevel,d_device,d_string,d_args...)\
162do { \
163 printk(d_loglevel PRINTK_HEADER " %s: " d_string "\n", \
Kay Sievers2a0217d2008-10-10 21:33:09 +0200164 dev_name(&d_device->cdev->dev), d_args); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165} while(0)
166
167#define MESSAGE_LOG(d_loglevel,d_string,d_args...)\
168do { \
169 printk(d_loglevel PRINTK_HEADER " " d_string "\n", d_args); \
170} while(0)
171
172struct dasd_ccw_req {
173 unsigned int magic; /* Eye catcher */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100174 struct list_head devlist; /* for dasd_device request queue */
175 struct list_head blocklist; /* for dasd_block request queue */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
177 /* Where to execute what... */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100178 struct dasd_block *block; /* the originating block device */
179 struct dasd_device *memdev; /* the device used to allocate this */
180 struct dasd_device *startdev; /* device the request is started on */
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +0100181 void *cpaddr; /* address of ccw or tcw */
182 unsigned char cpmode; /* 0 = cmd mode, 1 = itcw */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100183 char status; /* status of this request */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 short retries; /* A retry counter */
185 unsigned long flags; /* flags of this request */
186
187 /* ... and how */
188 unsigned long starttime; /* jiffies time of request start */
Stefan Haberland7c8faa82010-08-09 18:13:00 +0200189 unsigned long expires; /* expiration period in jiffies */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100190 char lpm; /* logical path mask */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 void *data; /* pointer to data area */
192
193 /* these are important for recovering erroneous requests */
Stefan Weinhuber6cc7f162009-06-12 10:26:39 +0200194 int intrc; /* internal error, e.g. from start_IO */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 struct irb irb; /* device status in case of an error */
196 struct dasd_ccw_req *refers; /* ERP-chain queueing. */
197 void *function; /* originating ERP action */
198
199 /* these are for statistics only */
200 unsigned long long buildclk; /* TOD-clock of request generation */
201 unsigned long long startclk; /* TOD-clock of request start */
202 unsigned long long stopclk; /* TOD-clock of request interrupt */
203 unsigned long long endclk; /* TOD-clock of request termination */
204
205 /* Callback that is called after reaching final status. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100206 void (*callback)(struct dasd_ccw_req *, void *data);
207 void *callback_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208};
209
Horst Hummel138c0142006-06-29 14:58:12 +0200210/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 * dasd_ccw_req -> status can be:
212 */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100213#define DASD_CQR_FILLED 0x00 /* request is ready to be processed */
214#define DASD_CQR_DONE 0x01 /* request is completed successfully */
215#define DASD_CQR_NEED_ERP 0x02 /* request needs recovery action */
216#define DASD_CQR_IN_ERP 0x03 /* request is in recovery */
217#define DASD_CQR_FAILED 0x04 /* request is finally failed */
218#define DASD_CQR_TERMINATED 0x05 /* request was stopped by driver */
219
220#define DASD_CQR_QUEUED 0x80 /* request is queued to be processed */
221#define DASD_CQR_IN_IO 0x81 /* request is currently in IO */
222#define DASD_CQR_ERROR 0x82 /* request is completed with error */
223#define DASD_CQR_CLEAR_PENDING 0x83 /* request is clear pending */
224#define DASD_CQR_CLEARED 0x84 /* request was cleared */
Coly Li73ac36e2009-01-07 18:09:16 -0800225#define DASD_CQR_SUCCESS 0x85 /* request was successful */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100226
Stefan Haberland7c8faa82010-08-09 18:13:00 +0200227/* default expiration time*/
228#define DASD_EXPIRES 300
229#define DASD_EXPIRES_MAX 40000000
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
231/* per dasd_ccw_req flags */
232#define DASD_CQR_FLAGS_USE_ERP 0 /* use ERP for this request */
Horst Hummel1c01b8a2006-01-06 00:19:15 -0800233#define DASD_CQR_FLAGS_FAILFAST 1 /* FAILFAST */
Stefan Weinhubera4d26c62011-01-05 12:48:03 +0100234#define DASD_CQR_VERIFY_PATH 2 /* path verification request */
Stefan Weinhuber5a27e602011-01-05 12:48:04 +0100235#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 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240/* Signature for error recovery functions. */
241typedef struct dasd_ccw_req *(*dasd_erp_fn_t) (struct dasd_ccw_req *);
242
243/*
Stefan Haberland2dedf0d2010-05-17 10:00:11 +0200244 * Unique identifier for dasd device.
245 */
246#define UA_NOT_CONFIGURED 0x00
247#define UA_BASE_DEVICE 0x01
248#define UA_BASE_PAV_ALIAS 0x02
249#define UA_HYPER_PAV_ALIAS 0x03
250
251struct dasd_uid {
252 __u8 type;
253 char vendor[4];
254 char serial[15];
255 __u16 ssid;
256 __u8 real_unit_addr;
257 __u8 base_unit_addr;
258 char vduit[33];
259};
260
261/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 * the struct dasd_discipline is
263 * sth like a table of virtual functions, if you think of dasd_eckd
264 * inheriting dasd...
265 * no, currently we are not planning to reimplement the driver in C++
266 */
267struct dasd_discipline {
268 struct module *owner;
269 char ebcname[8]; /* a name used for tagging and printks */
270 char name[8]; /* a name used for tagging and printks */
271 int max_blocks; /* maximum number of blocks to be chained */
272
273 struct list_head list; /* used for list of disciplines */
274
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100275 /*
276 * Device recognition functions. check_device is used to verify
277 * the sense data and the information returned by read device
278 * characteristics. It returns 0 if the discipline can be used
279 * for the device in question. uncheck_device is called during
280 * device shutdown to deregister a device from its discipline.
281 */
282 int (*check_device) (struct dasd_device *);
283 void (*uncheck_device) (struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100285 /*
286 * do_analysis is used in the step from device state "basic" to
287 * state "accept". It returns 0 if the device can be made ready,
288 * it returns -EMEDIUMTYPE if the device can't be made ready or
289 * -EAGAIN if do_analysis started a ccw that needs to complete
290 * before the analysis may be repeated.
291 */
292 int (*do_analysis) (struct dasd_block *);
293
294 /*
Stefan Weinhubera4d26c62011-01-05 12:48:03 +0100295 * This function is called, when new paths become available.
296 * Disciplins may use this callback to do necessary setup work,
297 * e.g. verify that new path is compatible with the current
298 * configuration.
299 */
300 int (*verify_path)(struct dasd_device *, __u8);
301
302 /*
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100303 * Last things to do when a device is set online, and first things
304 * when it is set offline.
305 */
306 int (*ready_to_online) (struct dasd_device *);
307 int (*online_to_ready) (struct dasd_device *);
308
309 /*
310 * Device operation functions. build_cp creates a ccw chain for
311 * a block device request, start_io starts the request and
312 * term_IO cancels it (e.g. in case of a timeout). format_device
313 * returns a ccw chain to be used to format the device.
314 * handle_terminated_request allows to examine a cqr and prepare
315 * it for retry.
316 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 struct dasd_ccw_req *(*build_cp) (struct dasd_device *,
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100318 struct dasd_block *,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 struct request *);
320 int (*start_IO) (struct dasd_ccw_req *);
321 int (*term_IO) (struct dasd_ccw_req *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100322 void (*handle_terminated_request) (struct dasd_ccw_req *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 struct dasd_ccw_req *(*format_device) (struct dasd_device *,
324 struct format_data_t *);
325 int (*free_cp) (struct dasd_ccw_req *, struct request *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100326
327 /*
328 * Error recovery functions. examine_error() returns a value that
329 * indicates what to do for an error condition. If examine_error()
Horst Hummel138c0142006-06-29 14:58:12 +0200330 * returns 'dasd_era_recover' erp_action() is called to create a
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100331 * special error recovery ccw. erp_postaction() is called after
332 * an error recovery ccw has finished its execution. dump_sense
333 * is called for every error condition to print the sense data
334 * to the console.
335 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 dasd_erp_fn_t(*erp_action) (struct dasd_ccw_req *);
337 dasd_erp_fn_t(*erp_postaction) (struct dasd_ccw_req *);
338 void (*dump_sense) (struct dasd_device *, struct dasd_ccw_req *,
339 struct irb *);
Stefan Haberlandaeec92c2009-07-07 16:37:06 +0200340 void (*dump_sense_dbf) (struct dasd_device *, struct irb *, char *);
Stefan Weinhuber5a27e602011-01-05 12:48:04 +0100341 void (*check_for_device_change) (struct dasd_device *,
342 struct dasd_ccw_req *,
343 struct irb *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100344
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345 /* i/o control functions. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100346 int (*fill_geometry) (struct dasd_block *, struct hd_geometry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347 int (*fill_info) (struct dasd_device *, struct dasd_information2_t *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100348 int (*ioctl) (struct dasd_block *, unsigned int, void __user *);
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200349
350 /* suspend/resume functions */
351 int (*freeze) (struct dasd_device *);
352 int (*restore) (struct dasd_device *);
Stefan Haberland501183f2010-05-17 10:00:10 +0200353
354 /* reload device after state change */
355 int (*reload) (struct dasd_device *);
Stefan Haberland2dedf0d2010-05-17 10:00:11 +0200356
357 int (*get_uid) (struct dasd_device *, struct dasd_uid *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358};
359
360extern struct dasd_discipline *dasd_diag_discipline_pointer;
361
Horst Hummel3d052592006-04-27 18:40:28 -0700362/*
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800363 * Notification numbers for extended error reporting notifications:
364 * The DASD_EER_DISABLE notification is sent before a dasd_device (and it's
365 * eer pointer) is freed. The error reporting module needs to do all necessary
366 * cleanup steps.
367 * The DASD_EER_TRIGGER notification sends the actual error reports (triggers).
368 */
369#define DASD_EER_DISABLE 0
370#define DASD_EER_TRIGGER 1
371
372/* Trigger IDs for extended error reporting DASD_EER_TRIGGER notification */
373#define DASD_EER_FATALERROR 1
374#define DASD_EER_NOPATH 2
375#define DASD_EER_STATECHANGE 3
376#define DASD_EER_PPRCSUSPEND 4
377
Stefan Weinhubera4d26c62011-01-05 12:48:03 +0100378struct dasd_path {
379 __u8 opm;
380 __u8 tbvpm;
381 __u8 ppm;
382 __u8 npm;
383};
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385struct dasd_device {
386 /* Block device stuff. */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100387 struct dasd_block *block;
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 unsigned int devindex;
Horst Hummel138c0142006-06-29 14:58:12 +0200390 unsigned long flags; /* per device flags */
391 unsigned short features; /* copy of devmap-features (read-only!) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800393 /* extended error reporting stuff (eer) */
394 struct dasd_ccw_req *eer_cqr;
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396 /* Device discipline stuff. */
397 struct dasd_discipline *discipline;
Peter Oberparleiteraa888612006-02-20 18:28:13 -0800398 struct dasd_discipline *base_discipline;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 char *private;
Stefan Weinhubera4d26c62011-01-05 12:48:03 +0100400 struct dasd_path path_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401
402 /* Device state and target state. */
403 int state, target;
Stefan Haberland9eb25122010-02-26 22:37:46 +0100404 struct mutex state_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 int stopped; /* device (ccw_device_start) was stopped */
406
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100407 /* reference count. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 atomic_t ref_count;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
410 /* ccw queue and memory for static ccw/erp buffers. */
411 struct list_head ccw_queue;
412 spinlock_t mem_lock;
413 void *ccw_mem;
414 void *erp_mem;
415 struct list_head ccw_chunks;
416 struct list_head erp_chunks;
417
418 atomic_t tasklet_scheduled;
419 struct tasklet_struct tasklet;
420 struct work_struct kick_work;
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200421 struct work_struct restore_device;
Stefan Haberland501183f2010-05-17 10:00:10 +0200422 struct work_struct reload_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 struct timer_list timer;
424
425 debug_info_t *debug_area;
426
427 struct ccw_device *cdev;
428
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100429 /* hook for alias management */
430 struct list_head alias_list;
Stefan Haberland7c8faa82010-08-09 18:13:00 +0200431
432 /* default expiration time in s */
433 unsigned long default_expires;
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100434};
435
436struct dasd_block {
437 /* Block device stuff. */
438 struct gendisk *gdp;
439 struct request_queue *request_queue;
440 spinlock_t request_queue_lock;
441 struct block_device *bdev;
442 atomic_t open_count;
443
Stefan Weinhuberb44b0ab32009-03-26 15:23:47 +0100444 unsigned long long blocks; /* size of volume in blocks */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100445 unsigned int bp_block; /* bytes per block */
446 unsigned int s2b_shift; /* log2 (bp_block/512) */
447
448 struct dasd_device *base;
449 struct list_head ccw_queue;
450 spinlock_t queue_lock;
451
452 atomic_t tasklet_scheduled;
453 struct tasklet_struct tasklet;
454 struct timer_list timer;
455
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456#ifdef CONFIG_DASD_PROFILE
457 struct dasd_profile_info_t profile;
458#endif
459};
460
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100461
462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463/* reasons why device (ccw_device_start) was stopped */
464#define DASD_STOPPED_NOT_ACC 1 /* not accessible */
465#define DASD_STOPPED_QUIESCE 2 /* Quiesced */
466#define DASD_STOPPED_PENDING 4 /* long busy */
467#define DASD_STOPPED_DC_WAIT 8 /* disconnected, wait */
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100468#define DASD_STOPPED_SU 16 /* summary unit check handling */
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200469#define DASD_STOPPED_PM 32 /* pm state transition */
470#define DASD_UNRESUMED_PM 64 /* pm resume failed state */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471
472/* per device flags */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473#define DASD_FLAG_OFFLINE 3 /* device is in offline processing */
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800474#define DASD_FLAG_EER_SNSS 4 /* A SNSS is required */
475#define DASD_FLAG_EER_IN_USE 5 /* A SNSS request is running */
Stefan Weinhuber33b62a32010-03-08 12:26:24 +0100476#define DASD_FLAG_DEVICE_RO 6 /* The device itself is read-only. Don't
477 * confuse this with the user specified
478 * read-only feature.
479 */
Stefan Weinhuber5a27e602011-01-05 12:48:04 +0100480#define DASD_FLAG_IS_RESERVED 7 /* The device is reserved */
481#define DASD_FLAG_LOCK_STOLEN 8 /* The device lock was stolen */
482
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484void dasd_put_device_wake(struct dasd_device *);
485
486/*
487 * Reference count inliners
488 */
489static inline void
490dasd_get_device(struct dasd_device *device)
491{
492 atomic_inc(&device->ref_count);
493}
494
495static inline void
496dasd_put_device(struct dasd_device *device)
497{
498 if (atomic_dec_return(&device->ref_count) == 0)
499 dasd_put_device_wake(device);
500}
501
502/*
503 * The static memory in ccw_mem and erp_mem is managed by a sorted
504 * list of free memory chunks.
505 */
506struct dasd_mchunk
507{
508 struct list_head list;
509 unsigned long size;
510} __attribute__ ((aligned(8)));
511
512static inline void
513dasd_init_chunklist(struct list_head *chunk_list, void *mem,
514 unsigned long size)
515{
516 struct dasd_mchunk *chunk;
517
518 INIT_LIST_HEAD(chunk_list);
519 chunk = (struct dasd_mchunk *) mem;
520 chunk->size = size - sizeof(struct dasd_mchunk);
521 list_add(&chunk->list, chunk_list);
522}
523
524static inline void *
525dasd_alloc_chunk(struct list_head *chunk_list, unsigned long size)
526{
527 struct dasd_mchunk *chunk, *tmp;
528
529 size = (size + 7L) & -8L;
530 list_for_each_entry(chunk, chunk_list, list) {
531 if (chunk->size < size)
532 continue;
533 if (chunk->size > size + sizeof(struct dasd_mchunk)) {
534 char *endaddr = (char *) (chunk + 1) + chunk->size;
535 tmp = (struct dasd_mchunk *) (endaddr - size) - 1;
536 tmp->size = size;
537 chunk->size -= size + sizeof(struct dasd_mchunk);
538 chunk = tmp;
539 } else
540 list_del(&chunk->list);
541 return (void *) (chunk + 1);
542 }
543 return NULL;
544}
545
546static inline void
547dasd_free_chunk(struct list_head *chunk_list, void *mem)
548{
549 struct dasd_mchunk *chunk, *tmp;
550 struct list_head *p, *left;
551
552 chunk = (struct dasd_mchunk *)
553 ((char *) mem - sizeof(struct dasd_mchunk));
554 /* Find out the left neighbour in chunk_list. */
555 left = chunk_list;
556 list_for_each(p, chunk_list) {
557 if (list_entry(p, struct dasd_mchunk, list) > chunk)
558 break;
559 left = p;
560 }
561 /* Try to merge with right neighbour = next element from left. */
562 if (left->next != chunk_list) {
563 tmp = list_entry(left->next, struct dasd_mchunk, list);
564 if ((char *) (chunk + 1) + chunk->size == (char *) tmp) {
565 list_del(&tmp->list);
566 chunk->size += tmp->size + sizeof(struct dasd_mchunk);
567 }
568 }
569 /* Try to merge with left neighbour. */
570 if (left != chunk_list) {
571 tmp = list_entry(left, struct dasd_mchunk, list);
572 if ((char *) (tmp + 1) + tmp->size == (char *) chunk) {
573 tmp->size += chunk->size + sizeof(struct dasd_mchunk);
574 return;
575 }
576 }
577 __list_add(&chunk->list, left, left->next);
578}
579
580/*
581 * Check if bsize is in { 512, 1024, 2048, 4096 }
582 */
583static inline int
584dasd_check_blocksize(int bsize)
585{
vignesh babue108ceb2007-10-12 16:11:39 +0200586 if (bsize < 512 || bsize > 4096 || !is_power_of_2(bsize))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587 return -EMEDIUMTYPE;
588 return 0;
589}
590
591/* externals in dasd.c */
592#define DASD_PROFILE_ON 1
593#define DASD_PROFILE_OFF 0
594
595extern debug_info_t *dasd_debug_area;
596extern struct dasd_profile_info_t dasd_global_profile;
597extern unsigned int dasd_profile_level;
Alexey Dobriyan83d5cde2009-09-21 17:01:13 -0700598extern const struct block_device_operations dasd_device_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
Christoph Lametere18b8902006-12-06 20:33:20 -0800600extern struct kmem_cache *dasd_page_cache;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601
602struct dasd_ccw_req *
Stefan Haberland68b781f2009-09-11 10:28:29 +0200603dasd_kmalloc_request(int , int, int, struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604struct dasd_ccw_req *
Stefan Haberland68b781f2009-09-11 10:28:29 +0200605dasd_smalloc_request(int , int, int, struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
607void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
608
609static inline int
610dasd_kmalloc_set_cda(struct ccw1 *ccw, void *cda, struct dasd_device *device)
611{
612 return set_normalized_cda(ccw, cda);
613}
614
615struct dasd_device *dasd_alloc_device(void);
616void dasd_free_device(struct dasd_device *);
617
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100618struct dasd_block *dasd_alloc_block(void);
619void dasd_free_block(struct dasd_block *);
620
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621void dasd_enable_device(struct dasd_device *);
622void dasd_set_target_state(struct dasd_device *, int);
623void dasd_kick_device(struct dasd_device *);
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200624void dasd_restore_device(struct dasd_device *);
Stefan Haberland501183f2010-05-17 10:00:10 +0200625void dasd_reload_device(struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626
627void dasd_add_request_head(struct dasd_ccw_req *);
628void dasd_add_request_tail(struct dasd_ccw_req *);
629int dasd_start_IO(struct dasd_ccw_req *);
630int dasd_term_IO(struct dasd_ccw_req *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100631void dasd_schedule_device_bh(struct dasd_device *);
632void dasd_schedule_block_bh(struct dasd_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633int dasd_sleep_on(struct dasd_ccw_req *);
634int dasd_sleep_on_immediatly(struct dasd_ccw_req *);
635int dasd_sleep_on_interruptible(struct dasd_ccw_req *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100636void dasd_device_set_timer(struct dasd_device *, int);
637void dasd_device_clear_timer(struct dasd_device *);
638void dasd_block_set_timer(struct dasd_block *, int);
639void dasd_block_clear_timer(struct dasd_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640int dasd_cancel_req(struct dasd_ccw_req *);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100641int dasd_flush_device_queue(struct dasd_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642int dasd_generic_probe (struct ccw_device *, struct dasd_discipline *);
643void dasd_generic_remove (struct ccw_device *cdev);
644int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
645int dasd_generic_set_offline (struct ccw_device *cdev);
646int dasd_generic_notify(struct ccw_device *, int);
Stefan Weinhubera4d26c62011-01-05 12:48:03 +0100647int dasd_generic_last_path_gone(struct dasd_device *);
648int dasd_generic_path_operational(struct dasd_device *);
649
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100650void dasd_generic_handle_state_change(struct dasd_device *);
Stefan Haberlandd41dd122009-06-16 10:30:25 +0200651int dasd_generic_pm_freeze(struct ccw_device *);
652int dasd_generic_restore_device(struct ccw_device *);
Stefan Haberlanda23ed002010-05-26 23:27:09 +0200653enum uc_todo dasd_generic_uc_handler(struct ccw_device *, struct irb *);
Stefan Weinhubera4d26c62011-01-05 12:48:03 +0100654void dasd_generic_path_event(struct ccw_device *, int *);
655int dasd_generic_verify_path(struct dasd_device *, __u8);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656
Stefan Haberland68b781f2009-09-11 10:28:29 +0200657int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +0100658char *dasd_get_sense(struct irb *);
Cornelia Huck17283b52007-05-04 18:47:51 +0200659
Stefan Weinhubereb6e1992009-12-07 12:51:51 +0100660void dasd_device_set_stop_bits(struct dasd_device *, int);
661void dasd_device_remove_stop_bits(struct dasd_device *, int);
662
Stefan Weinhuber33b62a32010-03-08 12:26:24 +0100663int dasd_device_is_ro(struct dasd_device *);
664
665
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666/* externals in dasd_devmap.c */
667extern int dasd_max_devindex;
668extern int dasd_probeonly;
669extern int dasd_autodetect;
Horst Hummel40545572006-06-29 15:08:18 +0200670extern int dasd_nopav;
Stefan Weinhuberf3eb5382009-03-26 15:23:48 +0100671extern int dasd_nofcx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672
673int dasd_devmap_init(void);
674void dasd_devmap_exit(void);
675
676struct dasd_device *dasd_create_device(struct ccw_device *);
677void dasd_delete_device(struct dasd_device *);
678
Horst Hummelf24acd42005-05-01 08:58:59 -0700679int dasd_get_feature(struct ccw_device *, int);
680int dasd_set_feature(struct ccw_device *, int, int);
681
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682int dasd_add_sysfs_files(struct ccw_device *);
683void dasd_remove_sysfs_files(struct ccw_device *);
684
685struct dasd_device *dasd_device_from_cdev(struct ccw_device *);
Martin Schwidefskya00bfd72006-09-20 15:59:05 +0200686struct dasd_device *dasd_device_from_cdev_locked(struct ccw_device *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687struct dasd_device *dasd_device_from_devindex(int);
688
689int dasd_parse(void);
Cornelia Huck69f90f62008-05-15 16:52:34 +0200690int dasd_busid_known(const char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691
692/* externals in dasd_gendisk.c */
693int dasd_gendisk_init(void);
694void dasd_gendisk_exit(void);
Stefan Weinhuber8e09f212008-01-26 14:11:23 +0100695int dasd_gendisk_alloc(struct dasd_block *);
696void dasd_gendisk_free(struct dasd_block *);
697int dasd_scan_partitions(struct dasd_block *);
698void dasd_destroy_partitions(struct dasd_block *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699
700/* externals in dasd_ioctl.c */
Al Viro57a7c0b2008-03-02 10:36:08 -0500701int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703/* externals in dasd_proc.c */
704int dasd_proc_init(void);
705void dasd_proc_exit(void);
706
707/* externals in dasd_erp.c */
708struct dasd_ccw_req *dasd_default_erp_action(struct dasd_ccw_req *);
709struct dasd_ccw_req *dasd_default_erp_postaction(struct dasd_ccw_req *);
710struct dasd_ccw_req *dasd_alloc_erp_request(char *, int, int,
711 struct dasd_device *);
712void dasd_free_erp_request(struct dasd_ccw_req *, struct dasd_device *);
713void dasd_log_sense(struct dasd_ccw_req *, struct irb *);
Stefan Haberlandfc19f382009-03-26 15:23:49 +0100714void dasd_log_sense_dbf(struct dasd_ccw_req *cqr, struct irb *irb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715
Linus Torvalds1da177e2005-04-16 15:20:36 -0700716/* externals in dasd_3990_erp.c */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717struct dasd_ccw_req *dasd_3990_erp_action(struct dasd_ccw_req *);
Stefan Haberlandf60c7682008-04-17 07:46:08 +0200718void dasd_3990_erp_handle_sim(struct dasd_device *, char *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
Stefan Weinhuber20c64462006-03-24 03:15:25 -0800720/* externals in dasd_eer.c */
721#ifdef CONFIG_DASD_EER
722int dasd_eer_init(void);
723void dasd_eer_exit(void);
724int dasd_eer_enable(struct dasd_device *);
725void dasd_eer_disable(struct dasd_device *);
726void dasd_eer_write(struct dasd_device *, struct dasd_ccw_req *cqr,
727 unsigned int id);
728void dasd_eer_snss(struct dasd_device *);
729
730static inline int dasd_eer_enabled(struct dasd_device *device)
731{
732 return device->eer_cqr != NULL;
733}
734#else
735#define dasd_eer_init() (0)
736#define dasd_eer_exit() do { } while (0)
737#define dasd_eer_enable(d) (0)
738#define dasd_eer_disable(d) do { } while (0)
739#define dasd_eer_write(d,c,i) do { } while (0)
740#define dasd_eer_snss(d) do { } while (0)
741#define dasd_eer_enabled(d) (0)
742#endif /* CONFIG_DASD_ERR */
743
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744#endif /* __KERNEL__ */
745
746#endif /* DASD_H */