| 1 | // SPDX-License-Identifier: GPL-2.0 | 
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| 2 | /* | 
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| 3 | * dev_printk.h - printk messages helpers for devices | 
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| 4 | * | 
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| 5 | * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> | 
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| 6 | * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> | 
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| 7 | * Copyright (c) 2008-2009 Novell Inc. | 
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| 8 | * | 
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| 9 | */ | 
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| 10 |  | 
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| 11 | #ifndef _DEVICE_PRINTK_H_ | 
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| 12 | #define _DEVICE_PRINTK_H_ | 
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| 13 |  | 
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| 14 | #include <linux/compiler.h> | 
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| 15 | #include <linux/types.h> | 
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| 16 | #include <linux/ratelimit.h> | 
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| 17 |  | 
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| 18 | #ifndef dev_fmt | 
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| 19 | #define dev_fmt(fmt) fmt | 
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| 20 | #endif | 
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| 21 |  | 
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| 22 | struct device; | 
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| 23 |  | 
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| 24 | #define PRINTK_INFO_SUBSYSTEM_LEN	16 | 
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| 25 | #define PRINTK_INFO_DEVICE_LEN		48 | 
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| 26 |  | 
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| 27 | struct dev_printk_info { | 
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| 28 | char subsystem[PRINTK_INFO_SUBSYSTEM_LEN]; | 
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| 29 | char device[PRINTK_INFO_DEVICE_LEN]; | 
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| 30 | }; | 
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| 31 |  | 
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| 32 | #ifdef CONFIG_PRINTK | 
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| 33 |  | 
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| 34 | __printf(3, 0) __cold | 
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| 35 | int dev_vprintk_emit(int level, const struct device *dev, | 
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| 36 | const char *fmt, va_list args); | 
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| 37 | __printf(3, 4) __cold | 
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| 38 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...); | 
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| 39 |  | 
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| 40 | __printf(3, 4) __cold | 
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| 41 | void _dev_printk(const char *level, const struct device *dev, | 
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| 42 | const char *fmt, ...); | 
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| 43 | __printf(2, 3) __cold | 
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| 44 | void _dev_emerg(const struct device *dev, const char *fmt, ...); | 
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| 45 | __printf(2, 3) __cold | 
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| 46 | void _dev_alert(const struct device *dev, const char *fmt, ...); | 
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| 47 | __printf(2, 3) __cold | 
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| 48 | void _dev_crit(const struct device *dev, const char *fmt, ...); | 
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| 49 | __printf(2, 3) __cold | 
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| 50 | void _dev_err(const struct device *dev, const char *fmt, ...); | 
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| 51 | __printf(2, 3) __cold | 
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| 52 | void _dev_warn(const struct device *dev, const char *fmt, ...); | 
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| 53 | __printf(2, 3) __cold | 
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| 54 | void _dev_notice(const struct device *dev, const char *fmt, ...); | 
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| 55 | __printf(2, 3) __cold | 
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| 56 | void _dev_info(const struct device *dev, const char *fmt, ...); | 
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| 57 |  | 
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| 58 | #else | 
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| 59 |  | 
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| 60 | static inline __printf(3, 0) | 
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| 61 | int dev_vprintk_emit(int level, const struct device *dev, | 
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| 62 | const char *fmt, va_list args) | 
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| 63 | { return 0; } | 
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| 64 | static inline __printf(3, 4) | 
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| 65 | int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) | 
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| 66 | { return 0; } | 
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| 67 |  | 
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| 68 | static inline void __dev_printk(const char *level, const struct device *dev, | 
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| 69 | struct va_format *vaf) | 
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| 70 | {} | 
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| 71 | static inline __printf(3, 4) | 
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| 72 | void _dev_printk(const char *level, const struct device *dev, | 
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| 73 | const char *fmt, ...) | 
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| 74 | {} | 
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| 75 |  | 
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| 76 | static inline __printf(2, 3) | 
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| 77 | void _dev_emerg(const struct device *dev, const char *fmt, ...) | 
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| 78 | {} | 
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| 79 | static inline __printf(2, 3) | 
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| 80 | void _dev_crit(const struct device *dev, const char *fmt, ...) | 
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| 81 | {} | 
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| 82 | static inline __printf(2, 3) | 
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| 83 | void _dev_alert(const struct device *dev, const char *fmt, ...) | 
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| 84 | {} | 
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| 85 | static inline __printf(2, 3) | 
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| 86 | void _dev_err(const struct device *dev, const char *fmt, ...) | 
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| 87 | {} | 
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| 88 | static inline __printf(2, 3) | 
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| 89 | void _dev_warn(const struct device *dev, const char *fmt, ...) | 
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| 90 | {} | 
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| 91 | static inline __printf(2, 3) | 
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| 92 | void _dev_notice(const struct device *dev, const char *fmt, ...) | 
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| 93 | {} | 
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| 94 | static inline __printf(2, 3) | 
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| 95 | void _dev_info(const struct device *dev, const char *fmt, ...) | 
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| 96 | {} | 
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| 97 |  | 
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| 98 | #endif | 
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| 99 |  | 
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| 100 | /* | 
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| 101 | * Need to take variadic arguments even though we don't use them, as dev_fmt() | 
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| 102 | * may only just have been expanded and may result in multiple arguments. | 
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| 103 | */ | 
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| 104 | #define dev_printk_index_emit(level, fmt, ...) \ | 
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| 105 | printk_index_subsys_emit("%s %s: ", level, fmt) | 
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| 106 |  | 
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| 107 | #define dev_printk_index_wrap(_p_func, level, dev, fmt, ...)		\ | 
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| 108 | ({								\ | 
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| 109 | dev_printk_index_emit(level, fmt);			\ | 
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| 110 | _p_func(dev, fmt, ##__VA_ARGS__);			\ | 
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| 111 | }) | 
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| 112 |  | 
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| 113 | /* | 
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| 114 | * Some callsites directly call dev_printk rather than going through the | 
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| 115 | * dev_<level> infrastructure, so we need to emit here as well as inside those | 
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| 116 | * level-specific macros. Only one index entry will be produced, either way, | 
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| 117 | * since dev_printk's `fmt` isn't known at compile time if going through the | 
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| 118 | * dev_<level> macros. | 
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| 119 | * | 
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| 120 | * dev_fmt() isn't called for dev_printk when used directly, as it's used by | 
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| 121 | * the dev_<level> macros internally which already have dev_fmt() processed. | 
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| 122 | * | 
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| 123 | * We also can't use dev_printk_index_wrap directly, because we have a separate | 
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| 124 | * level to process. | 
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| 125 | */ | 
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| 126 | #define dev_printk(level, dev, fmt, ...)				\ | 
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| 127 | ({								\ | 
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| 128 | dev_printk_index_emit(level, fmt);			\ | 
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| 129 | _dev_printk(level, dev, fmt, ##__VA_ARGS__);		\ | 
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| 130 | }) | 
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| 131 |  | 
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| 132 | /* | 
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| 133 | * Dummy dev_printk for disabled debugging statements to use whilst maintaining | 
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| 134 | * gcc's format checking. | 
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| 135 | */ | 
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| 136 | #define dev_no_printk(level, dev, fmt, ...)				\ | 
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| 137 | ({								\ | 
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| 138 | if (0)							\ | 
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| 139 | _dev_printk(level, dev, fmt, ##__VA_ARGS__);	\ | 
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| 140 | }) | 
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| 141 |  | 
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| 142 | /* | 
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| 143 | * #defines for all the dev_<level> macros to prefix with whatever | 
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| 144 | * possible use of #define dev_fmt(fmt) ... | 
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| 145 | */ | 
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| 146 |  | 
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| 147 | #define dev_emerg(dev, fmt, ...) \ | 
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| 148 | dev_printk_index_wrap(_dev_emerg, KERN_EMERG, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 149 | #define dev_crit(dev, fmt, ...) \ | 
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| 150 | dev_printk_index_wrap(_dev_crit, KERN_CRIT, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 151 | #define dev_alert(dev, fmt, ...) \ | 
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| 152 | dev_printk_index_wrap(_dev_alert, KERN_ALERT, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 153 | #define dev_err(dev, fmt, ...) \ | 
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| 154 | dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 155 | #define dev_warn(dev, fmt, ...) \ | 
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| 156 | dev_printk_index_wrap(_dev_warn, KERN_WARNING, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 157 | #define dev_notice(dev, fmt, ...) \ | 
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| 158 | dev_printk_index_wrap(_dev_notice, KERN_NOTICE, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 159 | #define dev_info(dev, fmt, ...) \ | 
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| 160 | dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 161 |  | 
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| 162 | #if defined(CONFIG_DYNAMIC_DEBUG) || \ | 
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| 163 | (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE)) | 
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| 164 | #define dev_dbg(dev, fmt, ...)						\ | 
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| 165 | dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 166 | #elif defined(DEBUG) | 
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| 167 | #define dev_dbg(dev, fmt, ...)						\ | 
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| 168 | dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 169 | #else | 
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| 170 | #define dev_dbg(dev, fmt, ...)						\ | 
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| 171 | dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 172 | #endif | 
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| 173 |  | 
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| 174 | #ifdef CONFIG_PRINTK | 
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| 175 | #define dev_level_once(dev_level, dev, fmt, ...)			\ | 
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| 176 | do {									\ | 
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| 177 | static bool __print_once __read_mostly;				\ | 
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| 178 | \ | 
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| 179 | if (!__print_once) {						\ | 
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| 180 | __print_once = true;					\ | 
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| 181 | dev_level(dev, fmt, ##__VA_ARGS__);			\ | 
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| 182 | }								\ | 
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| 183 | } while (0) | 
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| 184 | #else | 
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| 185 | #define dev_level_once(dev_level, dev, fmt, ...)			\ | 
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| 186 | do {									\ | 
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| 187 | if (0)								\ | 
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| 188 | dev_level(dev, fmt, ##__VA_ARGS__);			\ | 
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| 189 | } while (0) | 
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| 190 | #endif | 
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| 191 |  | 
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| 192 | #define dev_emerg_once(dev, fmt, ...)					\ | 
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| 193 | dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__) | 
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| 194 | #define dev_alert_once(dev, fmt, ...)					\ | 
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| 195 | dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__) | 
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| 196 | #define dev_crit_once(dev, fmt, ...)					\ | 
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| 197 | dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__) | 
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| 198 | #define dev_err_once(dev, fmt, ...)					\ | 
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| 199 | dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__) | 
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| 200 | #define dev_warn_once(dev, fmt, ...)					\ | 
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| 201 | dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__) | 
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| 202 | #define dev_notice_once(dev, fmt, ...)					\ | 
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| 203 | dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__) | 
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| 204 | #define dev_info_once(dev, fmt, ...)					\ | 
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| 205 | dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__) | 
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| 206 | #define dev_dbg_once(dev, fmt, ...)					\ | 
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| 207 | dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__) | 
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| 208 |  | 
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| 209 | #define dev_level_ratelimited(dev_level, dev, fmt, ...)			\ | 
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| 210 | do {									\ | 
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| 211 | static DEFINE_RATELIMIT_STATE(_rs,				\ | 
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| 212 | DEFAULT_RATELIMIT_INTERVAL,	\ | 
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| 213 | DEFAULT_RATELIMIT_BURST);		\ | 
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| 214 | if (__ratelimit(&_rs))						\ | 
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| 215 | dev_level(dev, fmt, ##__VA_ARGS__);			\ | 
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| 216 | } while (0) | 
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| 217 |  | 
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| 218 | #define dev_emerg_ratelimited(dev, fmt, ...)				\ | 
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| 219 | dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__) | 
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| 220 | #define dev_alert_ratelimited(dev, fmt, ...)				\ | 
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| 221 | dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__) | 
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| 222 | #define dev_crit_ratelimited(dev, fmt, ...)				\ | 
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| 223 | dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__) | 
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| 224 | #define dev_err_ratelimited(dev, fmt, ...)				\ | 
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| 225 | dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__) | 
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| 226 | #define dev_warn_ratelimited(dev, fmt, ...)				\ | 
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| 227 | dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__) | 
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| 228 | #define dev_notice_ratelimited(dev, fmt, ...)				\ | 
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| 229 | dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__) | 
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| 230 | #define dev_info_ratelimited(dev, fmt, ...)				\ | 
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| 231 | dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__) | 
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| 232 | #if defined(CONFIG_DYNAMIC_DEBUG) || \ | 
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| 233 | (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE)) | 
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| 234 | /* descriptor check is first to prevent flooding with "callbacks suppressed" */ | 
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| 235 | #define dev_dbg_ratelimited(dev, fmt, ...)				\ | 
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| 236 | do {									\ | 
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| 237 | static DEFINE_RATELIMIT_STATE(_rs,				\ | 
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| 238 | DEFAULT_RATELIMIT_INTERVAL,	\ | 
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| 239 | DEFAULT_RATELIMIT_BURST);		\ | 
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| 240 | DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt);			\ | 
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| 241 | if (DYNAMIC_DEBUG_BRANCH(descriptor) &&				\ | 
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| 242 | __ratelimit(&_rs))						\ | 
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| 243 | __dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt),	\ | 
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| 244 | ##__VA_ARGS__);			\ | 
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| 245 | } while (0) | 
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| 246 | #elif defined(DEBUG) | 
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| 247 | #define dev_dbg_ratelimited(dev, fmt, ...)				\ | 
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| 248 | do {									\ | 
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| 249 | static DEFINE_RATELIMIT_STATE(_rs,				\ | 
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| 250 | DEFAULT_RATELIMIT_INTERVAL,	\ | 
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| 251 | DEFAULT_RATELIMIT_BURST);		\ | 
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| 252 | if (__ratelimit(&_rs))						\ | 
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| 253 | dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ | 
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| 254 | } while (0) | 
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| 255 | #else | 
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| 256 | #define dev_dbg_ratelimited(dev, fmt, ...)				\ | 
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| 257 | dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 258 | #endif | 
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| 259 |  | 
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| 260 | #ifdef VERBOSE_DEBUG | 
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| 261 | #define dev_vdbg	dev_dbg | 
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| 262 | #else | 
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| 263 | #define dev_vdbg(dev, fmt, ...)						\ | 
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| 264 | dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) | 
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| 265 | #endif | 
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| 266 |  | 
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| 267 | /* | 
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| 268 | * dev_WARN*() acts like dev_printk(), but with the key difference of | 
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| 269 | * using WARN/WARN_ONCE to include file/line information and a backtrace. | 
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| 270 | */ | 
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| 271 | #define dev_WARN(dev, format, arg...) \ | 
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| 272 | WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg) | 
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| 273 |  | 
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| 274 | #define dev_WARN_ONCE(dev, condition, format, arg...) \ | 
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| 275 | WARN_ONCE(condition, "%s %s: " format, \ | 
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| 276 | dev_driver_string(dev), dev_name(dev), ## arg) | 
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| 277 |  | 
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| 278 | __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...); | 
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| 279 | __printf(3, 4) int dev_warn_probe(const struct device *dev, int err, const char *fmt, ...); | 
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| 280 |  | 
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| 281 | /* Simple helper for dev_err_probe() when ERR_PTR() is to be returned. */ | 
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| 282 | #define dev_err_ptr_probe(dev, ___err, fmt, ...) \ | 
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| 283 | ERR_PTR(dev_err_probe(dev, ___err, fmt, ##__VA_ARGS__)) | 
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| 284 |  | 
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| 285 | /* Simple helper for dev_err_probe() when ERR_CAST() is to be returned. */ | 
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| 286 | #define dev_err_cast_probe(dev, ___err_ptr, fmt, ...) \ | 
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| 287 | ERR_PTR(dev_err_probe(dev, PTR_ERR(___err_ptr), fmt, ##__VA_ARGS__)) | 
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| 288 |  | 
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| 289 | #endif /* _DEVICE_PRINTK_H_ */ | 
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| 290 |  | 
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