xref: /linux/include/linux/dev_printk.h (revision d2a4a07190f42e4f82805daf58e708400b703f1c)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * dev_printk.h - printk messages helpers for devices
4  *
5  * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org>
6  * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de>
7  * Copyright (c) 2008-2009 Novell Inc.
8  *
9  */
10 
11 #ifndef _DEVICE_PRINTK_H_
12 #define _DEVICE_PRINTK_H_
13 
14 #include <linux/compiler.h>
15 #include <linux/types.h>
16 #include <linux/ratelimit.h>
17 
18 #ifndef dev_fmt
19 #define dev_fmt(fmt) fmt
20 #endif
21 
22 struct device;
23 
24 #define PRINTK_INFO_SUBSYSTEM_LEN	16
25 #define PRINTK_INFO_DEVICE_LEN		48
26 
27 struct dev_printk_info {
28 	char subsystem[PRINTK_INFO_SUBSYSTEM_LEN];
29 	char device[PRINTK_INFO_DEVICE_LEN];
30 };
31 
32 #ifdef CONFIG_PRINTK
33 
34 __printf(3, 0) __cold
35 int dev_vprintk_emit(int level, const struct device *dev,
36 		     const char *fmt, va_list args);
37 __printf(3, 4) __cold
38 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...);
39 
40 __printf(3, 4) __cold
41 void _dev_printk(const char *level, const struct device *dev,
42 		 const char *fmt, ...);
43 __printf(2, 3) __cold
44 void _dev_emerg(const struct device *dev, const char *fmt, ...);
45 __printf(2, 3) __cold
46 void _dev_alert(const struct device *dev, const char *fmt, ...);
47 __printf(2, 3) __cold
48 void _dev_crit(const struct device *dev, const char *fmt, ...);
49 __printf(2, 3) __cold
50 void _dev_err(const struct device *dev, const char *fmt, ...);
51 __printf(2, 3) __cold
52 void _dev_warn(const struct device *dev, const char *fmt, ...);
53 __printf(2, 3) __cold
54 void _dev_notice(const struct device *dev, const char *fmt, ...);
55 __printf(2, 3) __cold
56 void _dev_info(const struct device *dev, const char *fmt, ...);
57 
58 #else
59 
60 static inline __printf(3, 0)
61 int dev_vprintk_emit(int level, const struct device *dev,
62 		     const char *fmt, va_list args)
63 { return 0; }
64 static inline __printf(3, 4)
65 int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...)
66 { return 0; }
67 
68 static inline void __dev_printk(const char *level, const struct device *dev,
69 				struct va_format *vaf)
70 {}
71 static inline __printf(3, 4)
72 void _dev_printk(const char *level, const struct device *dev,
73 		 const char *fmt, ...)
74 {}
75 
76 static inline __printf(2, 3)
77 void _dev_emerg(const struct device *dev, const char *fmt, ...)
78 {}
79 static inline __printf(2, 3)
80 void _dev_crit(const struct device *dev, const char *fmt, ...)
81 {}
82 static inline __printf(2, 3)
83 void _dev_alert(const struct device *dev, const char *fmt, ...)
84 {}
85 static inline __printf(2, 3)
86 void _dev_err(const struct device *dev, const char *fmt, ...)
87 {}
88 static inline __printf(2, 3)
89 void _dev_warn(const struct device *dev, const char *fmt, ...)
90 {}
91 static inline __printf(2, 3)
92 void _dev_notice(const struct device *dev, const char *fmt, ...)
93 {}
94 static inline __printf(2, 3)
95 void _dev_info(const struct device *dev, const char *fmt, ...)
96 {}
97 
98 #endif
99 
100 /*
101  * Need to take variadic arguments even though we don't use them, as dev_fmt()
102  * may only just have been expanded and may result in multiple arguments.
103  */
104 #define dev_printk_index_emit(level, fmt, ...) \
105 	printk_index_subsys_emit("%s %s: ", level, fmt)
106 
107 #define dev_printk_index_wrap(_p_func, level, dev, fmt, ...)		\
108 	({								\
109 		dev_printk_index_emit(level, fmt);			\
110 		_p_func(dev, fmt, ##__VA_ARGS__);			\
111 	})
112 
113 /*
114  * Some callsites directly call dev_printk rather than going through the
115  * dev_<level> infrastructure, so we need to emit here as well as inside those
116  * level-specific macros. Only one index entry will be produced, either way,
117  * since dev_printk's `fmt` isn't known at compile time if going through the
118  * dev_<level> macros.
119  *
120  * dev_fmt() isn't called for dev_printk when used directly, as it's used by
121  * the dev_<level> macros internally which already have dev_fmt() processed.
122  *
123  * We also can't use dev_printk_index_wrap directly, because we have a separate
124  * level to process.
125  */
126 #define dev_printk(level, dev, fmt, ...)				\
127 	({								\
128 		dev_printk_index_emit(level, fmt);			\
129 		_dev_printk(level, dev, fmt, ##__VA_ARGS__);		\
130 	})
131 
132 /*
133  * Dummy dev_printk for disabled debugging statements to use whilst maintaining
134  * gcc's format checking.
135  */
136 #define dev_no_printk(level, dev, fmt, ...)				\
137 	({								\
138 		if (0)							\
139 			_dev_printk(level, dev, fmt, ##__VA_ARGS__);	\
140 	})
141 
142 /*
143  * #defines for all the dev_<level> macros to prefix with whatever
144  * possible use of #define dev_fmt(fmt) ...
145  */
146 
147 #define dev_emerg(dev, fmt, ...) \
148 	dev_printk_index_wrap(_dev_emerg, KERN_EMERG, dev, dev_fmt(fmt), ##__VA_ARGS__)
149 #define dev_crit(dev, fmt, ...) \
150 	dev_printk_index_wrap(_dev_crit, KERN_CRIT, dev, dev_fmt(fmt), ##__VA_ARGS__)
151 #define dev_alert(dev, fmt, ...) \
152 	dev_printk_index_wrap(_dev_alert, KERN_ALERT, dev, dev_fmt(fmt), ##__VA_ARGS__)
153 #define dev_err(dev, fmt, ...) \
154 	dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__)
155 #define dev_warn(dev, fmt, ...) \
156 	dev_printk_index_wrap(_dev_warn, KERN_WARNING, dev, dev_fmt(fmt), ##__VA_ARGS__)
157 #define dev_notice(dev, fmt, ...) \
158 	dev_printk_index_wrap(_dev_notice, KERN_NOTICE, dev, dev_fmt(fmt), ##__VA_ARGS__)
159 #define dev_info(dev, fmt, ...) \
160 	dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__)
161 
162 #if defined(CONFIG_DYNAMIC_DEBUG) || \
163 	(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
164 #define dev_dbg(dev, fmt, ...)						\
165 	dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
166 #elif defined(DEBUG)
167 #define dev_dbg(dev, fmt, ...)						\
168 	dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
169 #else
170 #define dev_dbg(dev, fmt, ...)						\
171 	dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
172 #endif
173 
174 #ifdef CONFIG_PRINTK
175 #define dev_level_once(dev_level, dev, fmt, ...)			\
176 do {									\
177 	static bool __print_once __read_mostly;				\
178 									\
179 	if (!__print_once) {						\
180 		__print_once = true;					\
181 		dev_level(dev, fmt, ##__VA_ARGS__);			\
182 	}								\
183 } while (0)
184 #else
185 #define dev_level_once(dev_level, dev, fmt, ...)			\
186 do {									\
187 	if (0)								\
188 		dev_level(dev, fmt, ##__VA_ARGS__);			\
189 } while (0)
190 #endif
191 
192 #define dev_emerg_once(dev, fmt, ...)					\
193 	dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__)
194 #define dev_alert_once(dev, fmt, ...)					\
195 	dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__)
196 #define dev_crit_once(dev, fmt, ...)					\
197 	dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__)
198 #define dev_err_once(dev, fmt, ...)					\
199 	dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__)
200 #define dev_warn_once(dev, fmt, ...)					\
201 	dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__)
202 #define dev_notice_once(dev, fmt, ...)					\
203 	dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__)
204 #define dev_info_once(dev, fmt, ...)					\
205 	dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__)
206 #define dev_dbg_once(dev, fmt, ...)					\
207 	dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__)
208 
209 #define dev_level_ratelimited(dev_level, dev, fmt, ...)			\
210 do {									\
211 	static DEFINE_RATELIMIT_STATE(_rs,				\
212 				      DEFAULT_RATELIMIT_INTERVAL,	\
213 				      DEFAULT_RATELIMIT_BURST);		\
214 	if (__ratelimit(&_rs))						\
215 		dev_level(dev, fmt, ##__VA_ARGS__);			\
216 } while (0)
217 
218 #define dev_emerg_ratelimited(dev, fmt, ...)				\
219 	dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__)
220 #define dev_alert_ratelimited(dev, fmt, ...)				\
221 	dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__)
222 #define dev_crit_ratelimited(dev, fmt, ...)				\
223 	dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__)
224 #define dev_err_ratelimited(dev, fmt, ...)				\
225 	dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__)
226 #define dev_warn_ratelimited(dev, fmt, ...)				\
227 	dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__)
228 #define dev_notice_ratelimited(dev, fmt, ...)				\
229 	dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__)
230 #define dev_info_ratelimited(dev, fmt, ...)				\
231 	dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__)
232 #if defined(CONFIG_DYNAMIC_DEBUG) || \
233 	(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
234 /* descriptor check is first to prevent flooding with "callbacks suppressed" */
235 #define dev_dbg_ratelimited(dev, fmt, ...)				\
236 do {									\
237 	static DEFINE_RATELIMIT_STATE(_rs,				\
238 				      DEFAULT_RATELIMIT_INTERVAL,	\
239 				      DEFAULT_RATELIMIT_BURST);		\
240 	DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);			\
241 	if (DYNAMIC_DEBUG_BRANCH(descriptor) &&				\
242 	    __ratelimit(&_rs))						\
243 		__dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt),	\
244 				  ##__VA_ARGS__);			\
245 } while (0)
246 #elif defined(DEBUG)
247 #define dev_dbg_ratelimited(dev, fmt, ...)				\
248 do {									\
249 	static DEFINE_RATELIMIT_STATE(_rs,				\
250 				      DEFAULT_RATELIMIT_INTERVAL,	\
251 				      DEFAULT_RATELIMIT_BURST);		\
252 	if (__ratelimit(&_rs))						\
253 		dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
254 } while (0)
255 #else
256 #define dev_dbg_ratelimited(dev, fmt, ...)				\
257 	dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
258 #endif
259 
260 #ifdef VERBOSE_DEBUG
261 #define dev_vdbg	dev_dbg
262 #else
263 #define dev_vdbg(dev, fmt, ...)						\
264 	dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__)
265 #endif
266 
267 /*
268  * dev_WARN*() acts like dev_printk(), but with the key difference of
269  * using WARN/WARN_ONCE to include file/line information and a backtrace.
270  */
271 #define dev_WARN(dev, format, arg...) \
272 	WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg)
273 
274 #define dev_WARN_ONCE(dev, condition, format, arg...) \
275 	WARN_ONCE(condition, "%s %s: " format, \
276 			dev_driver_string(dev), dev_name(dev), ## arg)
277 
278 __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...);
279 
280 #endif /* _DEVICE_PRINTK_H_ */
281