627 lines
18 KiB
C
627 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __KERNEL_PRINTK__
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#define __KERNEL_PRINTK__
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#include <stdarg.h>
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#include <linux/init.h>
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#include <linux/kern_levels.h>
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#include <linux/linkage.h>
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#include <linux/cache.h>
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#include <linux/ratelimit_types.h>
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extern const char linux_banner[];
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extern const char linux_proc_banner[];
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extern int oops_in_progress; /* If set, an oops, panic(), BUG() or die() is in progress */
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#define PRINTK_MAX_SINGLE_HEADER_LEN 2
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static inline int printk_get_level(const char *buffer)
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{
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if (buffer[0] == KERN_SOH_ASCII && buffer[1]) {
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switch (buffer[1]) {
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case '0' ... '7':
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case 'c': /* KERN_CONT */
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return buffer[1];
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}
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}
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return 0;
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}
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static inline const char *printk_skip_level(const char *buffer)
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{
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if (printk_get_level(buffer))
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return buffer + 2;
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return buffer;
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}
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static inline const char *printk_skip_headers(const char *buffer)
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{
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while (printk_get_level(buffer))
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buffer = printk_skip_level(buffer);
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return buffer;
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}
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#define CONSOLE_EXT_LOG_MAX 8192
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/* printk's without a loglevel use this.. */
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#define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT
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/* We show everything that is MORE important than this.. */
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#define CONSOLE_LOGLEVEL_SILENT 0 /* Mum's the word */
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#define CONSOLE_LOGLEVEL_MIN 1 /* Minimum loglevel we let people use */
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#define CONSOLE_LOGLEVEL_DEBUG 10 /* issue debug messages */
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#define CONSOLE_LOGLEVEL_MOTORMOUTH 15 /* You can't shut this one up */
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/*
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* Default used to be hard-coded at 7, quiet used to be hardcoded at 4,
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* we're now allowing both to be set from kernel config.
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*/
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#define CONSOLE_LOGLEVEL_DEFAULT CONFIG_CONSOLE_LOGLEVEL_DEFAULT
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#define CONSOLE_LOGLEVEL_QUIET CONFIG_CONSOLE_LOGLEVEL_QUIET
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extern int console_printk[];
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#define console_loglevel (console_printk[0])
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#define default_message_loglevel (console_printk[1])
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#define minimum_console_loglevel (console_printk[2])
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#define default_console_loglevel (console_printk[3])
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static inline void console_silent(void)
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{
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console_loglevel = CONSOLE_LOGLEVEL_SILENT;
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}
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static inline void console_verbose(void)
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{
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if (console_loglevel)
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console_loglevel = CONSOLE_LOGLEVEL_MOTORMOUTH;
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}
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/* strlen("ratelimit") + 1 */
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#define DEVKMSG_STR_MAX_SIZE 10
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extern char devkmsg_log_str[];
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struct ctl_table;
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extern int suppress_printk;
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struct va_format {
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const char *fmt;
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va_list *va;
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};
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/*
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* FW_BUG
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* Add this to a message where you are sure the firmware is buggy or behaves
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* really stupid or out of spec. Be aware that the responsible BIOS developer
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* should be able to fix this issue or at least get a concrete idea of the
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* problem by reading your message without the need of looking at the kernel
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* code.
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*
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* Use it for definite and high priority BIOS bugs.
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*
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* FW_WARN
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* Use it for not that clear (e.g. could the kernel messed up things already?)
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* and medium priority BIOS bugs.
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*
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* FW_INFO
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* Use this one if you want to tell the user or vendor about something
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* suspicious, but generally harmless related to the firmware.
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*
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* Use it for information or very low priority BIOS bugs.
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*/
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#define FW_BUG "[Firmware Bug]: "
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#define FW_WARN "[Firmware Warn]: "
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#define FW_INFO "[Firmware Info]: "
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/*
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* HW_ERR
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* Add this to a message for hardware errors, so that user can report
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* it to hardware vendor instead of LKML or software vendor.
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*/
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#define HW_ERR "[Hardware Error]: "
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/*
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* DEPRECATED
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* Add this to a message whenever you want to warn user space about the use
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* of a deprecated aspect of an API so they can stop using it
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*/
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#define DEPRECATED "[Deprecated]: "
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/*
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* Dummy printk for disabled debugging statements to use whilst maintaining
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* gcc's format checking.
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*/
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#define no_printk(fmt, ...) \
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({ \
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if (0) \
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printk(fmt, ##__VA_ARGS__); \
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0; \
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})
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#ifdef CONFIG_EARLY_PRINTK
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extern asmlinkage __printf(1, 2)
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void early_printk(const char *fmt, ...);
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#else
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static inline __printf(1, 2) __cold
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void early_printk(const char *s, ...) { }
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#endif
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#ifdef CONFIG_PRINTK_NMI
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extern void printk_nmi_enter(void);
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extern void printk_nmi_exit(void);
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extern void printk_nmi_direct_enter(void);
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extern void printk_nmi_direct_exit(void);
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#else
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static inline void printk_nmi_enter(void) { }
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static inline void printk_nmi_exit(void) { }
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static inline void printk_nmi_direct_enter(void) { }
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static inline void printk_nmi_direct_exit(void) { }
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#endif /* PRINTK_NMI */
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struct dev_printk_info;
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#ifdef CONFIG_PRINTK
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asmlinkage __printf(4, 0)
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int vprintk_emit(int facility, int level,
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const struct dev_printk_info *dev_info,
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const char *fmt, va_list args);
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asmlinkage __printf(1, 0)
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int vprintk(const char *fmt, va_list args);
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asmlinkage __printf(1, 2) __cold
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int printk(const char *fmt, ...);
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/*
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* Special printk facility for scheduler/timekeeping use only, _DO_NOT_USE_ !
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*/
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__printf(1, 2) __cold int printk_deferred(const char *fmt, ...);
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/*
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* Please don't use printk_ratelimit(), because it shares ratelimiting state
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* with all other unrelated printk_ratelimit() callsites. Instead use
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* printk_ratelimited() or plain old __ratelimit().
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*/
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extern int __printk_ratelimit(const char *func);
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#define printk_ratelimit() __printk_ratelimit(__func__)
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extern bool printk_timed_ratelimit(unsigned long *caller_jiffies,
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unsigned int interval_msec);
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extern int printk_delay_msec;
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extern int dmesg_restrict;
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extern int
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devkmsg_sysctl_set_loglvl(struct ctl_table *table, int write, void *buf,
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size_t *lenp, loff_t *ppos);
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extern void wake_up_klogd(void);
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char *log_buf_addr_get(void);
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u32 log_buf_len_get(void);
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void log_buf_vmcoreinfo_setup(void);
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void __init setup_log_buf(int early);
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__printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...);
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void dump_stack_print_info(const char *log_lvl);
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void show_regs_print_info(const char *log_lvl);
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extern asmlinkage void dump_stack(void) __cold;
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extern void printk_safe_flush(void);
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extern void printk_safe_flush_on_panic(void);
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#else
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static inline __printf(1, 0)
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int vprintk(const char *s, va_list args)
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{
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return 0;
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}
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static inline __printf(1, 2) __cold
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int printk(const char *s, ...)
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{
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return 0;
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}
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static inline __printf(1, 2) __cold
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int printk_deferred(const char *s, ...)
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{
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return 0;
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}
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static inline int printk_ratelimit(void)
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{
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return 0;
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}
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static inline bool printk_timed_ratelimit(unsigned long *caller_jiffies,
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unsigned int interval_msec)
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{
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return false;
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}
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static inline void wake_up_klogd(void)
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{
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}
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static inline char *log_buf_addr_get(void)
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{
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return NULL;
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}
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static inline u32 log_buf_len_get(void)
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{
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return 0;
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}
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static inline void log_buf_vmcoreinfo_setup(void)
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{
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}
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static inline void setup_log_buf(int early)
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{
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}
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static inline __printf(1, 2) void dump_stack_set_arch_desc(const char *fmt, ...)
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{
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}
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static inline void dump_stack_print_info(const char *log_lvl)
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{
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}
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static inline void show_regs_print_info(const char *log_lvl)
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{
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}
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static inline void dump_stack(void)
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{
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}
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static inline void printk_safe_flush(void)
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{
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}
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static inline void printk_safe_flush_on_panic(void)
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{
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}
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#endif
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extern int kptr_restrict;
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/**
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* pr_fmt - used by the pr_*() macros to generate the printk format string
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* @fmt: format string passed from a pr_*() macro
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*
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* This macro can be used to generate a unified format string for pr_*()
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* macros. A common use is to prefix all pr_*() messages in a file with a common
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* string. For example, defining this at the top of a source file:
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*
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* #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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*
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* would prefix all pr_info, pr_emerg... messages in the file with the module
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* name.
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*/
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#ifndef pr_fmt
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#define pr_fmt(fmt) fmt
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#endif
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/**
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* pr_emerg - Print an emergency-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_EMERG loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_emerg(fmt, ...) \
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printk(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_alert - Print an alert-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_ALERT loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_alert(fmt, ...) \
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printk(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_crit - Print a critical-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_CRIT loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_crit(fmt, ...) \
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printk(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_err - Print an error-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_ERR loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_err(fmt, ...) \
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printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_warn - Print a warning-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_WARNING loglevel. It uses pr_fmt()
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* to generate the format string.
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*/
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#define pr_warn(fmt, ...) \
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printk(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_notice - Print a notice-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_NOTICE loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_notice(fmt, ...) \
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printk(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_info - Print an info-level message
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_INFO loglevel. It uses pr_fmt() to
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* generate the format string.
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*/
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#define pr_info(fmt, ...) \
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printk(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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/**
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* pr_cont - Continues a previous log message in the same line.
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_CONT loglevel. It should only be
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* used when continuing a log message with no newline ('\n') enclosed. Otherwise
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* it defaults back to KERN_DEFAULT loglevel.
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*/
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#define pr_cont(fmt, ...) \
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printk(KERN_CONT fmt, ##__VA_ARGS__)
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/**
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* pr_devel - Print a debug-level message conditionally
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to a printk with KERN_DEBUG loglevel if DEBUG is
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* defined. Otherwise it does nothing.
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*
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* It uses pr_fmt() to generate the format string.
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*/
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#ifdef DEBUG
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#define pr_devel(fmt, ...) \
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printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_devel(fmt, ...) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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/* If you are writing a driver, please use dev_dbg instead */
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#if defined(CONFIG_DYNAMIC_DEBUG) || \
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(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
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#include <linux/dynamic_debug.h>
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/**
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* pr_debug - Print a debug-level message conditionally
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* @fmt: format string
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* @...: arguments for the format string
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*
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* This macro expands to dynamic_pr_debug() if CONFIG_DYNAMIC_DEBUG is
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* set. Otherwise, if DEBUG is defined, it's equivalent to a printk with
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* KERN_DEBUG loglevel. If DEBUG is not defined it does nothing.
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*
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* It uses pr_fmt() to generate the format string (dynamic_pr_debug() uses
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* pr_fmt() internally).
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*/
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#define pr_debug(fmt, ...) \
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dynamic_pr_debug(fmt, ##__VA_ARGS__)
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#elif defined(DEBUG)
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#define pr_debug(fmt, ...) \
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printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_debug(fmt, ...) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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/*
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* Print a one-time message (analogous to WARN_ONCE() et al):
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*/
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#ifdef CONFIG_PRINTK
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#define printk_once(fmt, ...) \
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({ \
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static bool __section(".data.once") __print_once; \
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bool __ret_print_once = !__print_once; \
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\
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if (!__print_once) { \
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__print_once = true; \
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printk(fmt, ##__VA_ARGS__); \
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} \
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unlikely(__ret_print_once); \
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})
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#define printk_deferred_once(fmt, ...) \
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({ \
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static bool __section(".data.once") __print_once; \
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bool __ret_print_once = !__print_once; \
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\
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if (!__print_once) { \
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__print_once = true; \
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printk_deferred(fmt, ##__VA_ARGS__); \
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} \
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unlikely(__ret_print_once); \
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})
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#else
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#define printk_once(fmt, ...) \
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no_printk(fmt, ##__VA_ARGS__)
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#define printk_deferred_once(fmt, ...) \
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no_printk(fmt, ##__VA_ARGS__)
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#endif
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#define pr_emerg_once(fmt, ...) \
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printk_once(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_alert_once(fmt, ...) \
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printk_once(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_crit_once(fmt, ...) \
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printk_once(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_err_once(fmt, ...) \
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printk_once(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_warn_once(fmt, ...) \
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printk_once(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_notice_once(fmt, ...) \
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printk_once(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
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#define pr_info_once(fmt, ...) \
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printk_once(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
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/* no pr_cont_once, don't do that... */
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#if defined(DEBUG)
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#define pr_devel_once(fmt, ...) \
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printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_devel_once(fmt, ...) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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/* If you are writing a driver, please use dev_dbg instead */
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#if defined(DEBUG)
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#define pr_debug_once(fmt, ...) \
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printk_once(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#else
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#define pr_debug_once(fmt, ...) \
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no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
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#endif
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/*
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* ratelimited messages with local ratelimit_state,
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* no local ratelimit_state used in the !PRINTK case
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*/
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#ifdef CONFIG_PRINTK
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#define printk_ratelimited(fmt, ...) \
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({ \
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static DEFINE_RATELIMIT_STATE(_rs, \
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DEFAULT_RATELIMIT_INTERVAL, \
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DEFAULT_RATELIMIT_BURST); \
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\
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if (__ratelimit(&_rs)) \
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printk(fmt, ##__VA_ARGS__); \
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})
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#else
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#define printk_ratelimited(fmt, ...) \
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no_printk(fmt, ##__VA_ARGS__)
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#endif
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|
|
|
#define pr_emerg_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_EMERG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_alert_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_ALERT pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_crit_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_CRIT pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_err_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_warn_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_WARNING pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_notice_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_NOTICE pr_fmt(fmt), ##__VA_ARGS__)
|
|
#define pr_info_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_INFO pr_fmt(fmt), ##__VA_ARGS__)
|
|
/* no pr_cont_ratelimited, don't do that... */
|
|
|
|
#if defined(DEBUG)
|
|
#define pr_devel_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#else
|
|
#define pr_devel_ratelimited(fmt, ...) \
|
|
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#endif
|
|
|
|
/* If you are writing a driver, please use dev_dbg instead */
|
|
#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 pr_debug_ratelimited(fmt, ...) \
|
|
do { \
|
|
static DEFINE_RATELIMIT_STATE(_rs, \
|
|
DEFAULT_RATELIMIT_INTERVAL, \
|
|
DEFAULT_RATELIMIT_BURST); \
|
|
DEFINE_DYNAMIC_DEBUG_METADATA(descriptor, pr_fmt(fmt)); \
|
|
if (DYNAMIC_DEBUG_BRANCH(descriptor) && \
|
|
__ratelimit(&_rs)) \
|
|
__dynamic_pr_debug(&descriptor, pr_fmt(fmt), ##__VA_ARGS__); \
|
|
} while (0)
|
|
#elif defined(DEBUG)
|
|
#define pr_debug_ratelimited(fmt, ...) \
|
|
printk_ratelimited(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#else
|
|
#define pr_debug_ratelimited(fmt, ...) \
|
|
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
|
|
#endif
|
|
|
|
extern const struct file_operations kmsg_fops;
|
|
|
|
enum {
|
|
DUMP_PREFIX_NONE,
|
|
DUMP_PREFIX_ADDRESS,
|
|
DUMP_PREFIX_OFFSET
|
|
};
|
|
extern int hex_dump_to_buffer(const void *buf, size_t len, int rowsize,
|
|
int groupsize, char *linebuf, size_t linebuflen,
|
|
bool ascii);
|
|
#ifdef CONFIG_PRINTK
|
|
extern void print_hex_dump(const char *level, const char *prefix_str,
|
|
int prefix_type, int rowsize, int groupsize,
|
|
const void *buf, size_t len, bool ascii);
|
|
#else
|
|
static inline void print_hex_dump(const char *level, const char *prefix_str,
|
|
int prefix_type, int rowsize, int groupsize,
|
|
const void *buf, size_t len, bool ascii)
|
|
{
|
|
}
|
|
static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
|
|
const void *buf, size_t len)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
#if defined(CONFIG_DYNAMIC_DEBUG) || \
|
|
(defined(CONFIG_DYNAMIC_DEBUG_CORE) && defined(DYNAMIC_DEBUG_MODULE))
|
|
#define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
|
|
groupsize, buf, len, ascii) \
|
|
dynamic_hex_dump(prefix_str, prefix_type, rowsize, \
|
|
groupsize, buf, len, ascii)
|
|
#elif defined(DEBUG)
|
|
#define print_hex_dump_debug(prefix_str, prefix_type, rowsize, \
|
|
groupsize, buf, len, ascii) \
|
|
print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize, \
|
|
groupsize, buf, len, ascii)
|
|
#else
|
|
static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
|
|
int rowsize, int groupsize,
|
|
const void *buf, size_t len, bool ascii)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* print_hex_dump_bytes - shorthand form of print_hex_dump() with default params
|
|
* @prefix_str: string to prefix each line with;
|
|
* caller supplies trailing spaces for alignment if desired
|
|
* @prefix_type: controls whether prefix of an offset, address, or none
|
|
* is printed (%DUMP_PREFIX_OFFSET, %DUMP_PREFIX_ADDRESS, %DUMP_PREFIX_NONE)
|
|
* @buf: data blob to dump
|
|
* @len: number of bytes in the @buf
|
|
*
|
|
* Calls print_hex_dump(), with log level of KERN_DEBUG,
|
|
* rowsize of 16, groupsize of 1, and ASCII output included.
|
|
*/
|
|
#define print_hex_dump_bytes(prefix_str, prefix_type, buf, len) \
|
|
print_hex_dump_debug(prefix_str, prefix_type, 16, 1, buf, len, true)
|
|
|
|
#endif
|