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linux-next/include/linux/dev_printk.h
John Ogness 74caba7f2a printk: move dictionary keys to dev_printk_info 
Dictionaries are only used for SUBSYSTEM and DEVICE properties. The
current implementation stores the property names each time they are
used. This requires more space than otherwise necessary. Also,
because the dictionary entries are currently considered optional,
it cannot be relied upon that they are always available, even if the
writer wanted to store them. These issues will increase should new
dictionary properties be introduced.

Rather than storing the subsystem and device properties in the
dict ring, introduce a struct dev_printk_info with separate fields
to store only the property values. Embed this struct within the
struct printk_info to provide guaranteed availability.

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/87mu1jl6ne.fsf@jogness.linutronix.de
2020-09-22 11:27:48 +02:00

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// 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
/*
* #defines for all the dev_<level> macros to prefix with whatever
* possible use of #define dev_fmt(fmt) ...
*/
#define dev_emerg(dev, fmt, ...) \
_dev_emerg(dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_crit(dev, fmt, ...) \
_dev_crit(dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_alert(dev, fmt, ...) \
_dev_alert(dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_err(dev, fmt, ...) \
_dev_err(dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_warn(dev, fmt, ...) \
_dev_warn(dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_notice(dev, fmt, ...) \
_dev_notice(dev, dev_fmt(fmt), ##__VA_ARGS__)
#define dev_info(dev, fmt, ...) \
_dev_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, ...) \
({ \
if (0) \
dev_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, ...) \
do { \
if (0) \
dev_printk(KERN_DEBUG, dev, dev_fmt(fmt), ##__VA_ARGS__); \
} while (0)
#endif
#ifdef VERBOSE_DEBUG
#define dev_vdbg dev_dbg
#else
#define dev_vdbg(dev, fmt, ...) \
({ \
if (0) \
dev_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)
#endif /* _DEVICE_PRINTK_H_ */
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