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dev_printk.h
// SPDX-License-Identifier: GPL-2.0 /* * dev_printk.h - printk messages helpers for devices * * Copyright (c) 2001-2003 Patrick Mochel <mochel@osdl.org> * Copyright (c) 2004-2009 Greg Kroah-Hartman <gregkh@suse.de> * Copyright (c) 2008-2009 Novell Inc. * */ #ifndef _DEVICE_PRINTK_H_ #define _DEVICE_PRINTK_H_ #include <linux/compiler.h> #include <linux/types.h> #include <linux/ratelimit.h> #ifndef dev_fmt #define dev_fmt(fmt) fmt #endif struct device; #define PRINTK_INFO_SUBSYSTEM_LEN 16 #define PRINTK_INFO_DEVICE_LEN 48 struct dev_printk_info { char subsystem[PRINTK_INFO_SUBSYSTEM_LEN]; char device[PRINTK_INFO_DEVICE_LEN]; }; #ifdef CONFIG_PRINTK __printf(3, 0) __cold int dev_vprintk_emit(int level, const struct device *dev, const char *fmt, va_list args); __printf(3, 4) __cold int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...); __printf(3, 4) __cold void _dev_printk(const char *level, const struct device *dev, const char *fmt, ...); __printf(2, 3) __cold void _dev_emerg(const struct device *dev, const char *fmt, ...); __printf(2, 3) __cold void _dev_alert(const struct device *dev, const char *fmt, ...); __printf(2, 3) __cold void _dev_crit(const struct device *dev, const char *fmt, ...); __printf(2, 3) __cold void _dev_err(const struct device *dev, const char *fmt, ...); __printf(2, 3) __cold void _dev_warn(const struct device *dev, const char *fmt, ...); __printf(2, 3) __cold void _dev_notice(const struct device *dev, const char *fmt, ...); __printf(2, 3) __cold void _dev_info(const struct device *dev, const char *fmt, ...); #else static inline __printf(3, 0) int dev_vprintk_emit(int level, const struct device *dev, const char *fmt, va_list args) { return 0; } static inline __printf(3, 4) int dev_printk_emit(int level, const struct device *dev, const char *fmt, ...) { return 0; } static inline void __dev_printk(const char *level, const struct device *dev, struct va_format *vaf) {} static inline __printf(3, 4) void _dev_printk(const char *level, const struct device *dev, const char *fmt, ...) {} static inline __printf(2, 3) void _dev_emerg(const struct device *dev, const char *fmt, ...) {} static inline __printf(2, 3) void _dev_crit(const struct device *dev, const char *fmt, ...) {} static inline __printf(2, 3) void _dev_alert(const struct device *dev, const char *fmt, ...) {} static inline __printf(2, 3) void _dev_err(const struct device *dev, const char *fmt, ...) {} static inline __printf(2, 3) void _dev_warn(const struct device *dev, const char *fmt, ...) {} static inline __printf(2, 3) void _dev_notice(const struct device *dev, const char *fmt, ...) {} static inline __printf(2, 3) void _dev_info(const struct device *dev, const char *fmt, ...) {} #endif /* * Need to take variadic arguments even though we don't use them, as dev_fmt() * may only just have been expanded and may result in multiple arguments. */ #define dev_printk_index_emit(level, fmt, ...) \ printk_index_subsys_emit("%s %s: ", level, fmt) #define dev_printk_index_wrap(_p_func, level, dev, fmt, ...) \ ({ \ dev_printk_index_emit(level, fmt); \ _p_func(dev, fmt, ##__VA_ARGS__); \ }) /* * Some callsites directly call dev_printk rather than going through the * dev_<level> infrastructure, so we need to emit here as well as inside those * level-specific macros. Only one index entry will be produced, either way, * since dev_printk's `fmt` isn't known at compile time if going through the * dev_<level> macros. * * dev_fmt() isn't called for dev_printk when used directly, as it's used by * the dev_<level> macros internally which already have dev_fmt() processed. * * We also can't use dev_printk_index_wrap directly, because we have a separate * level to process. */ #define dev_printk(level, dev, fmt, ...) \ ({ \ dev_printk_index_emit(level, fmt); \ _dev_printk(level, dev, fmt, ##__VA_ARGS__); \ }) /* * Dummy dev_printk for disabled debugging statements to use whilst maintaining * gcc's format checking. */ #define dev_no_printk(level, dev, fmt, ...) \ ({ \ if (0) \ _dev_printk(level, dev, fmt, ##__VA_ARGS__); \ }) /* * #defines for all the dev_<level> macros to prefix with whatever * possible use of #define dev_fmt(fmt) ... */ #define dev_emerg(dev, fmt, ...) \ dev_printk_index_wrap(_dev_emerg, KERN_EMERG, dev, dev_fmt(fmt), ##__VA_ARGS__) #define dev_crit(dev, fmt, ...) \ dev_printk_index_wrap(_dev_crit, KERN_CRIT, dev, dev_fmt(fmt), ##__VA_ARGS__) #define dev_alert(dev, fmt, ...) \ dev_printk_index_wrap(_dev_alert, KERN_ALERT, dev, dev_fmt(fmt), ##__VA_ARGS__) #define dev_err(dev, fmt, ...) \ dev_printk_index_wrap(_dev_err, KERN_ERR, dev, dev_fmt(fmt), ##__VA_ARGS__) #define dev_warn(dev, fmt, ...) \ dev_printk_index_wrap(_dev_warn, KERN_WARNING, dev, dev_fmt(fmt), ##__VA_ARGS__) #define dev_notice(dev, fmt, ...) \ dev_printk_index_wrap(_dev_notice, KERN_NOTICE, dev, dev_fmt(fmt), ##__VA_ARGS__) #define dev_info(dev, fmt, ...) \ dev_printk_index_wrap(_dev_info, KERN_INFO, dev, dev_fmt(fmt), ##__VA_ARGS__) #if defined(CONFIG_DYNAMIC_DEBUG) || \ (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE)) #define dev_dbg(dev, fmt, ...) \ dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__) #elif defined(DEBUG) #define dev_dbg(dev, fmt, ...) \ dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) #else #define dev_dbg(dev, fmt, ...) \ dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) #endif #ifdef CONFIG_PRINTK #define dev_level_once(dev_level, dev, fmt, ...) \ do { \ static bool __print_once __read_mostly; \ \ if (!__print_once) { \ __print_once = true; \ dev_level(dev, fmt, ##__VA_ARGS__); \ } \ } while (0) #else #define dev_level_once(dev_level, dev, fmt, ...) \ do { \ if (0) \ dev_level(dev, fmt, ##__VA_ARGS__); \ } while (0) #endif #define dev_emerg_once(dev, fmt, ...) \ dev_level_once(dev_emerg, dev, fmt, ##__VA_ARGS__) #define dev_alert_once(dev, fmt, ...) \ dev_level_once(dev_alert, dev, fmt, ##__VA_ARGS__) #define dev_crit_once(dev, fmt, ...) \ dev_level_once(dev_crit, dev, fmt, ##__VA_ARGS__) #define dev_err_once(dev, fmt, ...) \ dev_level_once(dev_err, dev, fmt, ##__VA_ARGS__) #define dev_warn_once(dev, fmt, ...) \ dev_level_once(dev_warn, dev, fmt, ##__VA_ARGS__) #define dev_notice_once(dev, fmt, ...) \ dev_level_once(dev_notice, dev, fmt, ##__VA_ARGS__) #define dev_info_once(dev, fmt, ...) \ dev_level_once(dev_info, dev, fmt, ##__VA_ARGS__) #define dev_dbg_once(dev, fmt, ...) \ dev_level_once(dev_dbg, dev, fmt, ##__VA_ARGS__) #define dev_level_ratelimited(dev_level, dev, fmt, ...) \ do { \ static DEFINE_RATELIMIT_STATE(_rs, \ DEFAULT_RATELIMIT_INTERVAL, \ DEFAULT_RATELIMIT_BURST); \ if (__ratelimit(&_rs)) \ dev_level(dev, fmt, ##__VA_ARGS__); \ } while (0) #define dev_emerg_ratelimited(dev, fmt, ...) \ dev_level_ratelimited(dev_emerg, dev, fmt, ##__VA_ARGS__) #define dev_alert_ratelimited(dev, fmt, ...) \ dev_level_ratelimited(dev_alert, dev, fmt, ##__VA_ARGS__) #define dev_crit_ratelimited(dev, fmt, ...) \ dev_level_ratelimited(dev_crit, dev, fmt, ##__VA_ARGS__) #define dev_err_ratelimited(dev, fmt, ...) \ dev_level_ratelimited(dev_err, dev, fmt, ##__VA_ARGS__) #define dev_warn_ratelimited(dev, fmt, ...) \ dev_level_ratelimited(dev_warn, dev, fmt, ##__VA_ARGS__) #define dev_notice_ratelimited(dev, fmt, ...) \ dev_level_ratelimited(dev_notice, dev, fmt, ##__VA_ARGS__) #define dev_info_ratelimited(dev, fmt, ...) \ dev_level_ratelimited(dev_info, dev, fmt, ##__VA_ARGS__) #if defined(CONFIG_DYNAMIC_DEBUG) || \ (defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE)) /* descriptor check is first to prevent flooding with "callbacks suppressed" */ #define dev_dbg_ratelimited(dev, fmt, ...) \ do { \ static DEFINE_RATELIMIT_STATE(_rs, \ DEFAULT_RATELIMIT_INTERVAL, \ DEFAULT_RATELIMIT_BURST); \ DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, fmt); \ if (DYNAMIC_DEBUG_BRANCH(descriptor) && \ __ratelimit(&_rs)) \ __dynamic_dev_dbg(&descriptor, dev, dev_fmt(fmt), \ ##__VA_ARGS__); \ } while (0) #elif defined(DEBUG) #define dev_dbg_ratelimited(dev, fmt, ...) \ do { \ static DEFINE_RATELIMIT_STATE(_rs, \ DEFAULT_RATELIMIT_INTERVAL, \ DEFAULT_RATELIMIT_BURST); \ if (__ratelimit(&_rs)) \ dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \ } while (0) #else #define dev_dbg_ratelimited(dev, fmt, ...) \ dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) #endif #ifdef VERBOSE_DEBUG #define dev_vdbg dev_dbg #else #define dev_vdbg(dev, fmt, ...) \ dev_no_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__) #endif /* * dev_WARN*() acts like dev_printk(), but with the key difference of * using WARN/WARN_ONCE to include file/line information and a backtrace. */ #define dev_WARN(dev, format, arg...) \ WARN(1, "%s %s: " format, dev_driver_string(dev), dev_name(dev), ## arg) #define dev_WARN_ONCE(dev, condition, format, arg...) \ WARN_ONCE(condition, "%s %s: " format, \ dev_driver_string(dev), dev_name(dev), ## arg) __printf(3, 4) int dev_err_probe(const struct device *dev, int err, const char *fmt, ...); #endif /* _DEVICE_PRINTK_H_ */
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