1 /* SPDX-License-Identifier: GPL-2.0 */
5 * Copyright IBM Corp. 1999, 2000
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 <uapi/asm/debug.h>
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 */
24 #define DEBUG_DIR_ROOT "s390dbf" /* name of debug root directory in proc fs */
26 #define DEBUG_DATA(entry) (char *)(entry + 1) /* data is stored behind */
27 /* the entry information */
29 typedef struct __debug_entry debug_entry_t;
33 typedef struct debug_info {
34 struct debug_info *next;
35 struct debug_info *prev;
43 debug_entry_t ***areas;
47 struct dentry *debugfs_root_entry;
48 struct dentry *debugfs_entries[DEBUG_MAX_VIEWS];
49 struct debug_view *views[DEBUG_MAX_VIEWS];
50 char name[DEBUG_MAX_NAME_LEN];
54 typedef int (debug_header_proc_t) (debug_info_t *id,
55 struct debug_view *view,
60 typedef int (debug_format_proc_t) (debug_info_t *id,
61 struct debug_view *view, char *out_buf,
63 typedef int (debug_prolog_proc_t) (debug_info_t *id,
64 struct debug_view *view,
66 typedef int (debug_input_proc_t) (debug_info_t *id,
67 struct debug_view *view,
69 const char __user *user_buf,
70 size_t in_buf_size, loff_t *offset);
72 int debug_dflt_header_fn(debug_info_t *id, struct debug_view *view,
73 int area, debug_entry_t *entry, char *out_buf);
76 char name[DEBUG_MAX_NAME_LEN];
77 debug_prolog_proc_t *prolog_proc;
78 debug_header_proc_t *header_proc;
79 debug_format_proc_t *format_proc;
80 debug_input_proc_t *input_proc;
84 extern struct debug_view debug_hex_ascii_view;
85 extern struct debug_view debug_sprintf_view;
87 /* do NOT use the _common functions */
89 debug_entry_t *debug_event_common(debug_info_t *id, int level,
90 const void *data, int length);
92 debug_entry_t *debug_exception_common(debug_info_t *id, int level,
93 const void *data, int length);
95 /* Debug Feature API: */
97 debug_info_t *debug_register(const char *name, int pages, int nr_areas,
100 debug_info_t *debug_register_mode(const char *name, int pages, int nr_areas,
101 int buf_size, umode_t mode, uid_t uid,
104 void debug_unregister(debug_info_t *id);
106 void debug_set_level(debug_info_t *id, int new_level);
108 void debug_set_critical(void);
110 void debug_stop_all(void);
113 * debug_level_enabled() - Returns true if debug events for the specified
114 * level would be logged. Otherwise returns false.
116 * @id: handle for debug log
117 * @level: debug level
120 * - %true if level is less or equal to the current debug level.
122 static inline bool debug_level_enabled(debug_info_t *id, int level)
124 return level <= id->level;
128 * debug_event() - writes binary debug entry to active debug area
129 * (if level <= actual debug level)
131 * @id: handle for debug log
132 * @level: debug level
133 * @data: pointer to data for debug entry
134 * @length: length of data in bytes
137 * - Address of written debug entry
140 static inline debug_entry_t *debug_event(debug_info_t *id, int level,
141 void *data, int length)
143 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
145 return debug_event_common(id, level, data, length);
149 * debug_int_event() - writes unsigned integer debug entry to active debug area
150 * (if level <= actual debug level)
152 * @id: handle for debug log
153 * @level: debug level
154 * @tag: integer value for debug entry
157 * - Address of written debug entry
160 static inline debug_entry_t *debug_int_event(debug_info_t *id, int level,
163 unsigned int t = tag;
165 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
167 return debug_event_common(id, level, &t, sizeof(unsigned int));
171 * debug_long_event() - writes unsigned long debug entry to active debug area
172 * (if level <= actual debug level)
174 * @id: handle for debug log
175 * @level: debug level
176 * @tag: long integer value for debug entry
179 * - Address of written debug entry
182 static inline debug_entry_t *debug_long_event(debug_info_t *id, int level,
185 unsigned long t = tag;
187 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
189 return debug_event_common(id, level, &t, sizeof(unsigned long));
193 * debug_text_event() - writes string debug entry in ascii format to active
194 * debug area (if level <= actual debug level)
196 * @id: handle for debug log
197 * @level: debug level
198 * @txt: string for debug entry
201 * - Address of written debug entry
204 static inline debug_entry_t *debug_text_event(debug_info_t *id, int level,
207 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
209 return debug_event_common(id, level, txt, strlen(txt));
213 * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
214 * stored in the s390dbf. See Documentation/s390/s390dbf.rst for more details!
216 extern debug_entry_t *
217 __debug_sprintf_event(debug_info_t *id, int level, char *string, ...)
218 __attribute__ ((format(printf, 3, 4)));
221 * debug_sprintf_event() - writes debug entry with format string
222 * and varargs (longs) to active debug area
223 * (if level $<=$ actual debug level).
225 * @_id: handle for debug log
226 * @_level: debug level
227 * @_fmt: format string for debug entry
228 * @...: varargs used as in sprintf()
231 * - Address of written debug entry
234 * floats and long long datatypes cannot be used as varargs.
236 #define debug_sprintf_event(_id, _level, _fmt, ...) \
238 debug_entry_t *__ret; \
239 debug_info_t *__id = _id; \
240 int __level = _level; \
242 if ((!__id) || (__level > __id->level)) \
245 __ret = __debug_sprintf_event(__id, __level, \
246 _fmt, ## __VA_ARGS__); \
251 * debug_exception() - writes binary debug entry to active debug area
252 * (if level <= actual debug level)
253 * and switches to next debug area
255 * @id: handle for debug log
256 * @level: debug level
257 * @data: pointer to data for debug entry
258 * @length: length of data in bytes
261 * - Address of written debug entry
264 static inline debug_entry_t *debug_exception(debug_info_t *id, int level,
265 void *data, int length)
267 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
269 return debug_exception_common(id, level, data, length);
273 * debug_int_exception() - writes unsigned int debug entry to active debug area
274 * (if level <= actual debug level)
275 * and switches to next debug area
277 * @id: handle for debug log
278 * @level: debug level
279 * @tag: integer value for debug entry
282 * - Address of written debug entry
285 static inline debug_entry_t *debug_int_exception(debug_info_t *id, int level,
288 unsigned int t = tag;
290 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
292 return debug_exception_common(id, level, &t, sizeof(unsigned int));
296 * debug_long_exception() - writes long debug entry to active debug area
297 * (if level <= actual debug level)
298 * and switches to next debug area
300 * @id: handle for debug log
301 * @level: debug level
302 * @tag: long integer value for debug entry
305 * - Address of written debug entry
308 static inline debug_entry_t *debug_long_exception (debug_info_t *id, int level,
311 unsigned long t = tag;
313 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
315 return debug_exception_common(id, level, &t, sizeof(unsigned long));
319 * debug_text_exception() - writes string debug entry in ascii format to active
320 * debug area (if level <= actual debug level)
321 * and switches to next debug area
324 * @id: handle for debug log
325 * @level: debug level
326 * @txt: string for debug entry
329 * - Address of written debug entry
332 static inline debug_entry_t *debug_text_exception(debug_info_t *id, int level,
335 if ((!id) || (level > id->level) || (id->pages_per_area == 0))
337 return debug_exception_common(id, level, txt, strlen(txt));
341 * IMPORTANT: Use "%s" in sprintf format strings with care! Only pointers are
342 * stored in the s390dbf. See Documentation/s390/s390dbf.rst for more details!
344 extern debug_entry_t *
345 __debug_sprintf_exception(debug_info_t *id, int level, char *string, ...)
346 __attribute__ ((format(printf, 3, 4)));
350 * debug_sprintf_exception() - writes debug entry with format string and
351 * varargs (longs) to active debug area
352 * (if level <= actual debug level)
353 * and switches to next debug area.
355 * @_id: handle for debug log
356 * @_level: debug level
357 * @_fmt: format string for debug entry
358 * @...: varargs used as in sprintf()
361 * - Address of written debug entry
364 * floats and long long datatypes cannot be used as varargs.
366 #define debug_sprintf_exception(_id, _level, _fmt, ...) \
368 debug_entry_t *__ret; \
369 debug_info_t *__id = _id; \
370 int __level = _level; \
372 if ((!__id) || (__level > __id->level)) \
375 __ret = __debug_sprintf_exception(__id, __level, \
376 _fmt, ## __VA_ARGS__);\
380 int debug_register_view(debug_info_t *id, struct debug_view *view);
382 int debug_unregister_view(debug_info_t *id, struct debug_view *view);
385 define the debug levels:
386 - 0 No debugging output to console or syslog
387 - 1 Log internal errors to syslog, ignore check conditions
388 - 2 Log internal errors and check conditions to syslog
389 - 3 Log internal errors to console, log check conditions to syslog
390 - 4 Log internal errors and check conditions to console
391 - 5 panic on internal errors, log check conditions to console
392 - 6 panic on both, internal errors and check conditions
396 #define DEBUG_LEVEL 4
399 #define INTERNAL_ERRMSG(x,y...) "E" __FILE__ "%d: " x, __LINE__, y
400 #define INTERNAL_WRNMSG(x,y...) "W" __FILE__ "%d: " x, __LINE__, y
401 #define INTERNAL_INFMSG(x,y...) "I" __FILE__ "%d: " x, __LINE__, y
402 #define INTERNAL_DEBMSG(x,y...) "D" __FILE__ "%d: " x, __LINE__, y
405 #define PRINT_DEBUG(x...) printk(KERN_DEBUG PRINTK_HEADER x)
406 #define PRINT_INFO(x...) printk(KERN_INFO PRINTK_HEADER x)
407 #define PRINT_WARN(x...) printk(KERN_WARNING PRINTK_HEADER x)
408 #define PRINT_ERR(x...) printk(KERN_ERR PRINTK_HEADER x)
409 #define PRINT_FATAL(x...) panic(PRINTK_HEADER x)
411 #define PRINT_DEBUG(x...) printk(KERN_DEBUG PRINTK_HEADER x)
412 #define PRINT_INFO(x...) printk(KERN_DEBUG PRINTK_HEADER x)
413 #define PRINT_WARN(x...) printk(KERN_DEBUG PRINTK_HEADER x)
414 #define PRINT_ERR(x...) printk(KERN_DEBUG PRINTK_HEADER x)
415 #define PRINT_FATAL(x...) printk(KERN_DEBUG PRINTK_HEADER x)
416 #endif /* DASD_DEBUG */