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1/*
2 * include/asm-s390/debug.h
3 * S/390 debug facility
4 *
5 * Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
6 * IBM Corporation
7 */
8
9#ifndef DEBUG_H
10#define DEBUG_H
11
12#include <linux/fs.h>
13
14/* Note:
15 * struct __debug_entry must be defined outside of #ifdef __KERNEL__
16 * in order to allow a user program to analyze the 'raw'-view.
17 */
18
19struct __debug_entry{
20 union {
21 struct {
22 unsigned long long clock:52;
23 unsigned long long exception:1;
24 unsigned long long level:3;
25 unsigned long long cpuid:8;
26 } fields;
27
28 unsigned long long stck;
29 } id;
30 void* caller;
31} __attribute__((packed));
32
33
34#define __DEBUG_FEATURE_VERSION 2 /* version of debug feature */
35
36#ifdef __KERNEL__
37#include <linux/string.h>
38#include <linux/spinlock.h>
39#include <linux/kernel.h>
40#include <linux/time.h>
41
42#define DEBUG_MAX_LEVEL 6 /* debug levels range from 0 to 6 */
43#define DEBUG_OFF_LEVEL -1 /* level where debug is switched off */
44#define DEBUG_FLUSH_ALL -1 /* parameter to flush all areas */
45#define DEBUG_MAX_VIEWS 10 /* max number of views in proc fs */
46#define DEBUG_MAX_NAME_LEN 64 /* max length for a debugfs file name */
47#define DEBUG_DEFAULT_LEVEL 3 /* initial debug level */
48
49#define DEBUG_DIR_ROOT "s390dbf" /* name of debug root directory in proc fs */
50
51#define DEBUG_DATA(entry) (char*)(entry + 1) /* data is stored behind */
52 /* the entry information */
53
54typedef struct __debug_entry debug_entry_t;
55
56struct debug_view;
57
58typedef struct debug_info {
59 struct debug_info* next;
60 struct debug_info* prev;
61 atomic_t ref_count;
62 spinlock_t lock;
63 int level;
64 int nr_areas;
65 int pages_per_area;
66 int buf_size;
67 int entry_size;
68 debug_entry_t*** areas;
69 int active_area;
70 int *active_pages;
71 int *active_entries;
72 struct dentry* debugfs_root_entry;
73 struct dentry* debugfs_entries[DEBUG_MAX_VIEWS];
74 struct debug_view* views[DEBUG_MAX_VIEWS];
75 char name[DEBUG_MAX_NAME_LEN];
76 umode_t mode;
77} debug_info_t;
78
79typedef int (debug_header_proc_t) (debug_info_t* id,
80 struct debug_view* view,
81 int area,
82 debug_entry_t* entry,
83 char* out_buf);
84
85typedef int (debug_format_proc_t) (debug_info_t* id,
86 struct debug_view* view, char* out_buf,
87 const char* in_buf);
88typedef int (debug_prolog_proc_t) (debug_info_t* id,
89 struct debug_view* view,
90 char* out_buf);
91typedef int (debug_input_proc_t) (debug_info_t* id,
92 struct debug_view* view,
93 struct file* file,
94 const char __user *user_buf,
95 size_t in_buf_size, loff_t* offset);
96
97int debug_dflt_header_fn(debug_info_t* id, struct debug_view* view,
98 int area, debug_entry_t* entry, char* out_buf);
99
100struct debug_view {
101 char name[DEBUG_MAX_NAME_LEN];
102 debug_prolog_proc_t* prolog_proc;
103 debug_header_proc_t* header_proc;
104 debug_format_proc_t* format_proc;
105 debug_input_proc_t* input_proc;
106 void* private_data;
107};
108
109extern struct debug_view debug_hex_ascii_view;
110extern struct debug_view debug_raw_view;
111extern struct debug_view debug_sprintf_view;
112
113/* do NOT use the _common functions */
114
115debug_entry_t* debug_event_common(debug_info_t* id, int level,
116 const void* data, int length);
117
118debug_entry_t* debug_exception_common(debug_info_t* id, int level,
119 const void* data, int length);
120
121/* Debug Feature API: */
122
123debug_info_t *debug_register(const char *name, int pages, int nr_areas,
124 int buf_size);
125
126debug_info_t *debug_register_mode(const char *name, int pages, int nr_areas,
127 int buf_size, umode_t mode, uid_t uid,
128 gid_t gid);
129
130void debug_unregister(debug_info_t* id);
131
132void debug_set_level(debug_info_t* id, int new_level);
133
134void debug_set_critical(void);
135void debug_stop_all(void);
136
137static inline debug_entry_t*
138debug_event(debug_info_t* id, int level, void* data, int length)
139{
140 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
141 return NULL;
142 return debug_event_common(id,level,data,length);
143}
144
145static inline debug_entry_t*
146debug_int_event(debug_info_t* id, int level, unsigned int tag)
147{
148 unsigned int t=tag;
149 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
150 return NULL;
151 return debug_event_common(id,level,&t,sizeof(unsigned int));
152}
153
154static inline debug_entry_t *
155debug_long_event (debug_info_t* id, int level, unsigned long tag)
156{
157 unsigned long t=tag;
158 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
159 return NULL;
160 return debug_event_common(id,level,&t,sizeof(unsigned long));
161}
162
163static inline debug_entry_t*
164debug_text_event(debug_info_t* id, int level, const char* txt)
165{
166 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
167 return NULL;
168 return debug_event_common(id,level,txt,strlen(txt));
169}
170
171/*
172 * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
173 * stored in the s390dbf. See Documentation/s390/s390dbf.txt for more details!
174 */
175extern debug_entry_t *
176debug_sprintf_event(debug_info_t* id,int level,char *string,...)
177 __attribute__ ((format(printf, 3, 4)));
178
179
180static inline debug_entry_t*
181debug_exception(debug_info_t* id, int level, void* data, int length)
182{
183 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
184 return NULL;
185 return debug_exception_common(id,level,data,length);
186}
187
188static inline debug_entry_t*
189debug_int_exception(debug_info_t* id, int level, unsigned int tag)
190{
191 unsigned int t=tag;
192 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
193 return NULL;
194 return debug_exception_common(id,level,&t,sizeof(unsigned int));
195}
196
197static inline debug_entry_t *
198debug_long_exception (debug_info_t* id, int level, unsigned long tag)
199{
200 unsigned long t=tag;
201 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
202 return NULL;
203 return debug_exception_common(id,level,&t,sizeof(unsigned long));
204}
205
206static inline debug_entry_t*
207debug_text_exception(debug_info_t* id, int level, const char* txt)
208{
209 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
210 return NULL;
211 return debug_exception_common(id,level,txt,strlen(txt));
212}
213
214/*
215 * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
216 * stored in the s390dbf. See Documentation/s390/s390dbf.txt for more details!
217 */
218extern debug_entry_t *
219debug_sprintf_exception(debug_info_t* id,int level,char *string,...)
220 __attribute__ ((format(printf, 3, 4)));
221
222int debug_register_view(debug_info_t* id, struct debug_view* view);
223int debug_unregister_view(debug_info_t* id, struct debug_view* view);
224
225/*
226 define the debug levels:
227 - 0 No debugging output to console or syslog
228 - 1 Log internal errors to syslog, ignore check conditions
229 - 2 Log internal errors and check conditions to syslog
230 - 3 Log internal errors to console, log check conditions to syslog
231 - 4 Log internal errors and check conditions to console
232 - 5 panic on internal errors, log check conditions to console
233 - 6 panic on both, internal errors and check conditions
234 */
235
236#ifndef DEBUG_LEVEL
237#define DEBUG_LEVEL 4
238#endif
239
240#define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
241#define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
242#define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
243#define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
244
245#if DEBUG_LEVEL > 0
246#define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
247#define PRINT_INFO(x...) printk ( KERN_INFO PRINTK_HEADER x )
248#define PRINT_WARN(x...) printk ( KERN_WARNING PRINTK_HEADER x )
249#define PRINT_ERR(x...) printk ( KERN_ERR PRINTK_HEADER x )
250#define PRINT_FATAL(x...) panic ( PRINTK_HEADER x )
251#else
252#define PRINT_DEBUG(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
253#define PRINT_INFO(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
254#define PRINT_WARN(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
255#define PRINT_ERR(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
256#define PRINT_FATAL(x...) printk ( KERN_DEBUG PRINTK_HEADER x )
257#endif /* DASD_DEBUG */
258
259#endif /* __KERNEL__ */
260#endif /* DEBUG_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * S/390 debug facility
4 *
5 * Copyright IBM Corp. 1999, 2020
6 */
7#ifndef DEBUG_H
8#define DEBUG_H
9
10#include <linux/string.h>
11#include <linux/spinlock.h>
12#include <linux/kernel.h>
13#include <linux/time.h>
14#include <linux/refcount.h>
15#include <linux/fs.h>
16
17#define DEBUG_MAX_LEVEL 6 /* debug levels range from 0 to 6 */
18#define DEBUG_OFF_LEVEL -1 /* level where debug is switched off */
19#define DEBUG_FLUSH_ALL -1 /* parameter to flush all areas */
20#define DEBUG_MAX_VIEWS 10 /* max number of views in proc fs */
21#define DEBUG_MAX_NAME_LEN 64 /* max length for a debugfs file name */
22#define DEBUG_DEFAULT_LEVEL 3 /* initial debug level */
23
24#define DEBUG_DIR_ROOT "s390dbf" /* name of debug root directory in proc fs */
25
26#define DEBUG_DATA(entry) (char *)(entry + 1) /* data is stored behind */
27 /* the entry information */
28
29#define __DEBUG_FEATURE_VERSION 3 /* version of debug feature */
30
31struct __debug_entry {
32 unsigned long clock : 60;
33 unsigned long exception : 1;
34 unsigned long level : 3;
35 void *caller;
36 unsigned short cpu;
37} __packed;
38
39typedef struct __debug_entry debug_entry_t;
40
41struct debug_view;
42
43typedef struct debug_info {
44 struct debug_info *next;
45 struct debug_info *prev;
46 refcount_t ref_count;
47 spinlock_t lock;
48 int level;
49 int nr_areas;
50 int pages_per_area;
51 int buf_size;
52 int entry_size;
53 debug_entry_t ***areas;
54 int active_area;
55 int *active_pages;
56 int *active_entries;
57 struct dentry *debugfs_root_entry;
58 struct dentry *debugfs_entries[DEBUG_MAX_VIEWS];
59 struct debug_view *views[DEBUG_MAX_VIEWS];
60 char name[DEBUG_MAX_NAME_LEN];
61 umode_t mode;
62} debug_info_t;
63
64typedef int (debug_header_proc_t) (debug_info_t *id,
65 struct debug_view *view,
66 int area,
67 debug_entry_t *entry,
68 char *out_buf);
69
70typedef int (debug_format_proc_t) (debug_info_t *id,
71 struct debug_view *view, char *out_buf,
72 const char *in_buf);
73typedef int (debug_prolog_proc_t) (debug_info_t *id,
74 struct debug_view *view,
75 char *out_buf);
76typedef int (debug_input_proc_t) (debug_info_t *id,
77 struct debug_view *view,
78 struct file *file,
79 const char __user *user_buf,
80 size_t in_buf_size, loff_t *offset);
81
82int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view,
83 int area, debug_entry_t *entry, char *out_buf);
84
85struct debug_view {
86 char name[DEBUG_MAX_NAME_LEN];
87 debug_prolog_proc_t *prolog_proc;
88 debug_header_proc_t *header_proc;
89 debug_format_proc_t *format_proc;
90 debug_input_proc_t *input_proc;
91 void *private_data;
92};
93
94extern struct debug_view debug_hex_ascii_view;
95extern struct debug_view debug_sprintf_view;
96
97/* do NOT use the _common functions */
98
99debug_entry_t *debug_event_common(debug_info_t *id, int level,
100 const void *data, int length);
101
102debug_entry_t *debug_exception_common(debug_info_t *id, int level,
103 const void *data, int length);
104
105/* Debug Feature API: */
106
107debug_info_t *debug_register(const char *name, int pages, int nr_areas,
108 int buf_size);
109
110debug_info_t *debug_register_mode(const char *name, int pages, int nr_areas,
111 int buf_size, umode_t mode, uid_t uid,
112 gid_t gid);
113
114void debug_unregister(debug_info_t *id);
115
116void debug_set_level(debug_info_t *id, int new_level);
117
118void debug_set_critical(void);
119
120void debug_stop_all(void);
121
122/**
123 * debug_level_enabled() - Returns true if debug events for the specified
124 * level would be logged. Otherwise returns false.
125 *
126 * @id: handle for debug log
127 * @level: debug level
128 *
129 * Return:
130 * - %true if level is less or equal to the current debug level.
131 */
132static inline bool debug_level_enabled(debug_info_t *id, int level)
133{
134 return level <= id->level;
135}
136
137/**
138 * debug_event() - writes binary debug entry to active debug area
139 * (if level <= actual debug level)
140 *
141 * @id: handle for debug log
142 * @level: debug level
143 * @data: pointer to data for debug entry
144 * @length: length of data in bytes
145 *
146 * Return:
147 * - Address of written debug entry
148 * - %NULL if error
149 */
150static inline debug_entry_t *debug_event(debug_info_t *id, int level,
151 void *data, int length)
152{
153 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
154 return NULL;
155 return debug_event_common(id, level, data, length);
156}
157
158/**
159 * debug_int_event() - writes unsigned integer debug entry to active debug area
160 * (if level <= actual debug level)
161 *
162 * @id: handle for debug log
163 * @level: debug level
164 * @tag: integer value for debug entry
165 *
166 * Return:
167 * - Address of written debug entry
168 * - %NULL if error
169 */
170static inline debug_entry_t *debug_int_event(debug_info_t *id, int level,
171 unsigned int tag)
172{
173 unsigned int t = tag;
174
175 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
176 return NULL;
177 return debug_event_common(id, level, &t, sizeof(unsigned int));
178}
179
180/**
181 * debug_long_event() - writes unsigned long debug entry to active debug area
182 * (if level <= actual debug level)
183 *
184 * @id: handle for debug log
185 * @level: debug level
186 * @tag: long integer value for debug entry
187 *
188 * Return:
189 * - Address of written debug entry
190 * - %NULL if error
191 */
192static inline debug_entry_t *debug_long_event(debug_info_t *id, int level,
193 unsigned long tag)
194{
195 unsigned long t = tag;
196
197 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
198 return NULL;
199 return debug_event_common(id, level, &t, sizeof(unsigned long));
200}
201
202/**
203 * debug_text_event() - writes string debug entry in ascii format to active
204 * debug area (if level <= actual debug level)
205 *
206 * @id: handle for debug log
207 * @level: debug level
208 * @txt: string for debug entry
209 *
210 * Return:
211 * - Address of written debug entry
212 * - %NULL if error
213 */
214static inline debug_entry_t *debug_text_event(debug_info_t *id, int level,
215 const char *txt)
216{
217 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
218 return NULL;
219 return debug_event_common(id, level, txt, strlen(txt));
220}
221
222/*
223 * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
224 * stored in the s390dbf. See Documentation/s390/s390dbf.rst for more details!
225 */
226extern debug_entry_t *
227__debug_sprintf_event(debug_info_t *id, int level, char *string, ...)
228 __attribute__ ((format(printf, 3, 4)));
229
230/**
231 * debug_sprintf_event() - writes debug entry with format string
232 * and varargs (longs) to active debug area
233 * (if level $<=$ actual debug level).
234 *
235 * @_id: handle for debug log
236 * @_level: debug level
237 * @_fmt: format string for debug entry
238 * @...: varargs used as in sprintf()
239 *
240 * Return:
241 * - Address of written debug entry
242 * - %NULL if error
243 *
244 * floats and long long datatypes cannot be used as varargs.
245 */
246#define debug_sprintf_event(_id, _level, _fmt, ...) \
247({ \
248 debug_entry_t *__ret; \
249 debug_info_t *__id = _id; \
250 int __level = _level; \
251 \
252 if ((!__id) || (__level > __id->level)) \
253 __ret = NULL; \
254 else \
255 __ret = __debug_sprintf_event(__id, __level, \
256 _fmt, ## __VA_ARGS__); \
257 __ret; \
258})
259
260/**
261 * debug_exception() - writes binary debug entry to active debug area
262 * (if level <= actual debug level)
263 * and switches to next debug area
264 *
265 * @id: handle for debug log
266 * @level: debug level
267 * @data: pointer to data for debug entry
268 * @length: length of data in bytes
269 *
270 * Return:
271 * - Address of written debug entry
272 * - %NULL if error
273 */
274static inline debug_entry_t *debug_exception(debug_info_t *id, int level,
275 void *data, int length)
276{
277 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
278 return NULL;
279 return debug_exception_common(id, level, data, length);
280}
281
282/**
283 * debug_int_exception() - writes unsigned int debug entry to active debug area
284 * (if level <= actual debug level)
285 * and switches to next debug area
286 *
287 * @id: handle for debug log
288 * @level: debug level
289 * @tag: integer value for debug entry
290 *
291 * Return:
292 * - Address of written debug entry
293 * - %NULL if error
294 */
295static inline debug_entry_t *debug_int_exception(debug_info_t *id, int level,
296 unsigned int tag)
297{
298 unsigned int t = tag;
299
300 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
301 return NULL;
302 return debug_exception_common(id, level, &t, sizeof(unsigned int));
303}
304
305/**
306 * debug_long_exception() - writes long debug entry to active debug area
307 * (if level <= actual debug level)
308 * and switches to next debug area
309 *
310 * @id: handle for debug log
311 * @level: debug level
312 * @tag: long integer value for debug entry
313 *
314 * Return:
315 * - Address of written debug entry
316 * - %NULL if error
317 */
318static inline debug_entry_t *debug_long_exception (debug_info_t *id, int level,
319 unsigned long tag)
320{
321 unsigned long t = tag;
322
323 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
324 return NULL;
325 return debug_exception_common(id, level, &t, sizeof(unsigned long));
326}
327
328/**
329 * debug_text_exception() - writes string debug entry in ascii format to active
330 * debug area (if level <= actual debug level)
331 * and switches to next debug area
332 * area
333 *
334 * @id: handle for debug log
335 * @level: debug level
336 * @txt: string for debug entry
337 *
338 * Return:
339 * - Address of written debug entry
340 * - %NULL if error
341 */
342static inline debug_entry_t *debug_text_exception(debug_info_t *id, int level,
343 const char *txt)
344{
345 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
346 return NULL;
347 return debug_exception_common(id, level, txt, strlen(txt));
348}
349
350/*
351 * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
352 * stored in the s390dbf. See Documentation/s390/s390dbf.rst for more details!
353 */
354extern debug_entry_t *
355__debug_sprintf_exception(debug_info_t *id, int level, char *string, ...)
356 __attribute__ ((format(printf, 3, 4)));
357
358
359/**
360 * debug_sprintf_exception() - writes debug entry with format string and
361 * varargs (longs) to active debug area
362 * (if level <= actual debug level)
363 * and switches to next debug area.
364 *
365 * @_id: handle for debug log
366 * @_level: debug level
367 * @_fmt: format string for debug entry
368 * @...: varargs used as in sprintf()
369 *
370 * Return:
371 * - Address of written debug entry
372 * - %NULL if error
373 *
374 * floats and long long datatypes cannot be used as varargs.
375 */
376#define debug_sprintf_exception(_id, _level, _fmt, ...) \
377({ \
378 debug_entry_t *__ret; \
379 debug_info_t *__id = _id; \
380 int __level = _level; \
381 \
382 if ((!__id) || (__level > __id->level)) \
383 __ret = NULL; \
384 else \
385 __ret = __debug_sprintf_exception(__id, __level, \
386 _fmt, ## __VA_ARGS__);\
387 __ret; \
388})
389
390int debug_register_view(debug_info_t *id, struct debug_view *view);
391
392int debug_unregister_view(debug_info_t *id, struct debug_view *view);
393
394/*
395 define the debug levels:
396 - 0 No debugging output to console or syslog
397 - 1 Log internal errors to syslog, ignore check conditions
398 - 2 Log internal errors and check conditions to syslog
399 - 3 Log internal errors to console, log check conditions to syslog
400 - 4 Log internal errors and check conditions to console
401 - 5 panic on internal errors, log check conditions to console
402 - 6 panic on both, internal errors and check conditions
403 */
404
405#ifndef DEBUG_LEVEL
406#define DEBUG_LEVEL 4
407#endif
408
409#define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
410#define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
411#define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
412#define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
413
414#if DEBUG_LEVEL > 0
415#define PRINT_DEBUG(x...) printk(KERN_DEBUG PRINTK_HEADER x)
416#define PRINT_INFO(x...) printk(KERN_INFO PRINTK_HEADER x)
417#define PRINT_WARN(x...) printk(KERN_WARNING PRINTK_HEADER x)
418#define PRINT_ERR(x...) printk(KERN_ERR PRINTK_HEADER x)
419#define PRINT_FATAL(x...) panic(PRINTK_HEADER x)
420#else
421#define PRINT_DEBUG(x...) printk(KERN_DEBUG PRINTK_HEADER x)
422#define PRINT_INFO(x...) printk(KERN_DEBUG PRINTK_HEADER x)
423#define PRINT_WARN(x...) printk(KERN_DEBUG PRINTK_HEADER x)
424#define PRINT_ERR(x...) printk(KERN_DEBUG PRINTK_HEADER x)
425#define PRINT_FATAL(x...) printk(KERN_DEBUG PRINTK_HEADER x)
426#endif /* DASD_DEBUG */
427
428#endif /* DEBUG_H */