[linux-block.git] / kernel / printk / internal.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * internal.h - printk internal definitions
 */
#include <linux/percpu.h>

#ifdef CONFIG_PRINTK

#define PRINTK_SAFE_CONTEXT_MASK	0x007ffffff
#define PRINTK_NMI_DIRECT_CONTEXT_MASK	0x008000000
#define PRINTK_NMI_CONTEXT_MASK		0xff0000000

#define PRINTK_NMI_CONTEXT_OFFSET	0x010000000

__printf(4, 0)
int vprintk_store(int facility, int level,
		  const struct dev_printk_info *dev_info,
		  const char *fmt, va_list args);

__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
void __printk_safe_enter(void);
void __printk_safe_exit(void);

void printk_safe_init(void);
bool printk_percpu_data_ready(void);

#define printk_safe_enter_irqsave(flags)	\
	do {					\
		local_irq_save(flags);		\
		__printk_safe_enter();		\
	} while (0)

#define printk_safe_exit_irqrestore(flags)	\
	do {					\
		__printk_safe_exit();		\
		local_irq_restore(flags);	\
	} while (0)

#define printk_safe_enter_irq()		\
	do {					\
		local_irq_disable();		\
		__printk_safe_enter();		\
	} while (0)

#define printk_safe_exit_irq()			\
	do {					\
		__printk_safe_exit();		\
		local_irq_enable();		\
	} while (0)

void defer_console_output(void);

#else

/*
 * In !PRINTK builds we still export console_sem
 * semaphore and some of console functions (console_unlock()/etc.), so
 * printk-safe must preserve the existing local IRQ guarantees.
 */
#define printk_safe_enter_irqsave(flags) local_irq_save(flags)
#define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)

#define printk_safe_enter_irq() local_irq_disable()
#define printk_safe_exit_irq() local_irq_enable()

static inline void printk_safe_init(void) { }
static inline bool printk_percpu_data_ready(void) { return false; }
#endif /* CONFIG_PRINTK */
Commit	Line	Data
1ccea77e	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
42a0bb3f PM	2	/*
42a0bb3f PM	3	* internal.h - printk internal definitions
42a0bb3f PM	4	*/
	5	#include <linux/percpu.h>
	6
099f1c84 SS	7	#ifdef CONFIG_PRINTK
099f1c84 SS	8
8c4e93c3 PM	9	#define PRINTK_SAFE_CONTEXT_MASK 0x007ffffff
	10	#define PRINTK_NMI_DIRECT_CONTEXT_MASK 0x008000000
	11	#define PRINTK_NMI_CONTEXT_MASK 0xff0000000
	12
	13	#define PRINTK_NMI_CONTEXT_OFFSET 0x010000000
099f1c84	14
74caba7f	15	__printf(4, 0)
03fc7f9c	16	int vprintk_store(int facility, int level,
74caba7f	17	const struct dev_printk_info *dev_info,
03fc7f9c PM	18	const char *fmt, va_list args);
03fc7f9c PM	19
099f1c84	20	__printf(1, 0) int vprintk_default(const char *fmt, va_list args);
719f6a70	21	__printf(1, 0) int vprintk_deferred(const char *fmt, va_list args);
099f1c84 SS	22	void __printk_safe_enter(void);
	23	void __printk_safe_exit(void);
	24
ab6f762f SS	25	void printk_safe_init(void);
	26	bool printk_percpu_data_ready(void);
	27
099f1c84 SS	28	#define printk_safe_enter_irqsave(flags) \
	29	do { \
	30	local_irq_save(flags); \
	31	__printk_safe_enter(); \
	32	} while (0)
	33
	34	#define printk_safe_exit_irqrestore(flags) \
	35	do { \
	36	__printk_safe_exit(); \
	37	local_irq_restore(flags); \
	38	} while (0)
	39
	40	#define printk_safe_enter_irq() \
	41	do { \
	42	local_irq_disable(); \
	43	__printk_safe_enter(); \
	44	} while (0)
	45
	46	#define printk_safe_exit_irq() \
	47	do { \
	48	__printk_safe_exit(); \
	49	local_irq_enable(); \
	50	} while (0)
	51
03fc7f9c PM	52	void defer_console_output(void);
03fc7f9c PM	53
099f1c84 SS	54	#else
099f1c84 SS	55
099f1c84	56	/*
996e9666	57	* In !PRINTK builds we still export console_sem
099f1c84 SS	58	* semaphore and some of console functions (console_unlock()/etc.), so
	59	* printk-safe must preserve the existing local IRQ guarantees.
	60	*/
	61	#define printk_safe_enter_irqsave(flags) local_irq_save(flags)
	62	#define printk_safe_exit_irqrestore(flags) local_irq_restore(flags)
	63
	64	#define printk_safe_enter_irq() local_irq_disable()
	65	#define printk_safe_exit_irq() local_irq_enable()
	66
ab6f762f SS	67	static inline void printk_safe_init(void) { }
ab6f762f SS	68	static inline bool printk_percpu_data_ready(void) { return false; }
099f1c84	69	#endif /* CONFIG_PRINTK */