[linux-2.6-block.git] / include / linux / irqflags.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * include/linux/irqflags.h
 *
 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
 * provide callbacks for transitions between ON and OFF states.
 *
 * This file gets included from lowlevel asm headers too, to provide
 * wrapped versions of the local_irq_*() APIs, based on the
 * raw_local_irq_*() macros from the lowlevel headers.
 */
#ifndef _LINUX_TRACE_IRQFLAGS_H
#define _LINUX_TRACE_IRQFLAGS_H

#include <linux/typecheck.h>
#include <asm/irqflags.h>

#ifdef CONFIG_TRACE_IRQFLAGS
  extern void trace_softirqs_on(unsigned long ip);
  extern void trace_softirqs_off(unsigned long ip);
  extern void trace_hardirqs_on(void);
  extern void trace_hardirqs_off(void);
# define trace_hardirq_context(p)	((p)->hardirq_context)
# define trace_softirq_context(p)	((p)->softirq_context)
# define trace_hardirqs_enabled(p)	((p)->hardirqs_enabled)
# define trace_softirqs_enabled(p)	((p)->softirqs_enabled)
# define trace_hardirq_enter()			\
do {						\
	current->hardirq_context++;		\
	crossrelease_hist_start(XHLOCK_HARD);	\
} while (0)
# define trace_hardirq_exit()			\
do {						\
	current->hardirq_context--;		\
	crossrelease_hist_end(XHLOCK_HARD);	\
} while (0)
# define lockdep_softirq_enter()		\
do {						\
	current->softirq_context++;		\
	crossrelease_hist_start(XHLOCK_SOFT);	\
} while (0)
# define lockdep_softirq_exit()			\
do {						\
	current->softirq_context--;		\
	crossrelease_hist_end(XHLOCK_SOFT);	\
} while (0)
# define INIT_TRACE_IRQFLAGS	.softirqs_enabled = 1,
#else
# define trace_hardirqs_on()		do { } while (0)
# define trace_hardirqs_off()		do { } while (0)
# define trace_softirqs_on(ip)		do { } while (0)
# define trace_softirqs_off(ip)		do { } while (0)
# define trace_hardirq_context(p)	0
# define trace_softirq_context(p)	0
# define trace_hardirqs_enabled(p)	0
# define trace_softirqs_enabled(p)	0
# define trace_hardirq_enter()		do { } while (0)
# define trace_hardirq_exit()		do { } while (0)
# define lockdep_softirq_enter()	do { } while (0)
# define lockdep_softirq_exit()		do { } while (0)
# define INIT_TRACE_IRQFLAGS
#endif

#if defined(CONFIG_IRQSOFF_TRACER) || \
	defined(CONFIG_PREEMPT_TRACER)
 extern void stop_critical_timings(void);
 extern void start_critical_timings(void);
#else
# define stop_critical_timings() do { } while (0)
# define start_critical_timings() do { } while (0)
#endif

/*
 * Wrap the arch provided IRQ routines to provide appropriate checks.
 */
#define raw_local_irq_disable()		arch_local_irq_disable()
#define raw_local_irq_enable()		arch_local_irq_enable()
#define raw_local_irq_save(flags)			\
	do {						\
		typecheck(unsigned long, flags);	\
		flags = arch_local_irq_save();		\
	} while (0)
#define raw_local_irq_restore(flags)			\
	do {						\
		typecheck(unsigned long, flags);	\
		arch_local_irq_restore(flags);		\
	} while (0)
#define raw_local_save_flags(flags)			\
	do {						\
		typecheck(unsigned long, flags);	\
		flags = arch_local_save_flags();	\
	} while (0)
#define raw_irqs_disabled_flags(flags)			\
	({						\
		typecheck(unsigned long, flags);	\
		arch_irqs_disabled_flags(flags);	\
	})
#define raw_irqs_disabled()		(arch_irqs_disabled())
#define raw_safe_halt()			arch_safe_halt()

/*
 * The local_irq_*() APIs are equal to the raw_local_irq*()
 * if !TRACE_IRQFLAGS.
 */
#ifdef CONFIG_TRACE_IRQFLAGS
#define local_irq_enable() \
	do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
#define local_irq_disable() \
	do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
#define local_irq_save(flags)				\
	do {						\
		raw_local_irq_save(flags);		\
		trace_hardirqs_off();			\
	} while (0)


#define local_irq_restore(flags)			\
	do {						\
		if (raw_irqs_disabled_flags(flags)) {	\
			raw_local_irq_restore(flags);	\
			trace_hardirqs_off();		\
		} else {				\
			trace_hardirqs_on();		\
			raw_local_irq_restore(flags);	\
		}					\
	} while (0)

#define safe_halt()				\
	do {					\
		trace_hardirqs_on();		\
		raw_safe_halt();		\
	} while (0)


#else /* !CONFIG_TRACE_IRQFLAGS */

#define local_irq_enable()	do { raw_local_irq_enable(); } while (0)
#define local_irq_disable()	do { raw_local_irq_disable(); } while (0)
#define local_irq_save(flags)					\
	do {							\
		raw_local_irq_save(flags);			\
	} while (0)
#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
#define safe_halt()		do { raw_safe_halt(); } while (0)

#endif /* CONFIG_TRACE_IRQFLAGS */

#define local_save_flags(flags)	raw_local_save_flags(flags)

/*
 * Some architectures don't define arch_irqs_disabled(), so even if either
 * definition would be fine we need to use different ones for the time being
 * to avoid build issues.
 */
#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
#define irqs_disabled()					\
	({						\
		unsigned long _flags;			\
		raw_local_save_flags(_flags);		\
		raw_irqs_disabled_flags(_flags);	\
	})
#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
#define irqs_disabled()	raw_irqs_disabled()
#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */

#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
de30a2b3 IM	2	/*
	3	* include/linux/irqflags.h
	4	*
	5	* IRQ flags tracing: follow the state of the hardirq and softirq flags and
	6	* provide callbacks for transitions between ON and OFF states.
	7	*
	8	* This file gets included from lowlevel asm headers too, to provide
	9	* wrapped versions of the local_irq_*() APIs, based on the
	10	* raw_local_irq_*() macros from the lowlevel headers.
	11	*/
	12	#ifndef _LINUX_TRACE_IRQFLAGS_H
	13	#define _LINUX_TRACE_IRQFLAGS_H
	14
3f307891	15	#include <linux/typecheck.h>
df9ee292	16	#include <asm/irqflags.h>
3f307891	17
de30a2b3	18	#ifdef CONFIG_TRACE_IRQFLAGS
de30a2b3 IM	19	extern void trace_softirqs_on(unsigned long ip);
de30a2b3 IM	20	extern void trace_softirqs_off(unsigned long ip);
81d68a96 SR	21	extern void trace_hardirqs_on(void);
81d68a96 SR	22	extern void trace_hardirqs_off(void);
de30a2b3 IM	23	# define trace_hardirq_context(p) ((p)->hardirq_context)
	24	# define trace_softirq_context(p) ((p)->softirq_context)
	25	# define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
	26	# define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
b09be676 BP	27	# define trace_hardirq_enter() \
	28	do { \
	29	current->hardirq_context++; \
f52be570	30	crossrelease_hist_start(XHLOCK_HARD); \
b09be676 BP	31	} while (0)
	32	# define trace_hardirq_exit() \
	33	do { \
	34	current->hardirq_context--; \
	35	crossrelease_hist_end(XHLOCK_HARD); \
	36	} while (0)
	37	# define lockdep_softirq_enter() \
	38	do { \
	39	current->softirq_context++; \
f52be570	40	crossrelease_hist_start(XHLOCK_SOFT); \
b09be676 BP	41	} while (0)
	42	# define lockdep_softirq_exit() \
	43	do { \
	44	current->softirq_context--; \
	45	crossrelease_hist_end(XHLOCK_SOFT); \
	46	} while (0)
de30a2b3 IM	47	# define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
	48	#else
	49	# define trace_hardirqs_on() do { } while (0)
	50	# define trace_hardirqs_off() do { } while (0)
	51	# define trace_softirqs_on(ip) do { } while (0)
	52	# define trace_softirqs_off(ip) do { } while (0)
	53	# define trace_hardirq_context(p) 0
	54	# define trace_softirq_context(p) 0
	55	# define trace_hardirqs_enabled(p) 0
	56	# define trace_softirqs_enabled(p) 0
	57	# define trace_hardirq_enter() do { } while (0)
	58	# define trace_hardirq_exit() do { } while (0)
d820ac4c IM	59	# define lockdep_softirq_enter() do { } while (0)
d820ac4c IM	60	# define lockdep_softirq_exit() do { } while (0)
de30a2b3 IM	61	# define INIT_TRACE_IRQFLAGS
	62	#endif
	63
6cd8a4bb SR	64	#if defined(CONFIG_IRQSOFF_TRACER) \|\| \
6cd8a4bb SR	65	defined(CONFIG_PREEMPT_TRACER)
81d68a96 SR	66	extern void stop_critical_timings(void);
	67	extern void start_critical_timings(void);
	68	#else
	69	# define stop_critical_timings() do { } while (0)
	70	# define start_critical_timings() do { } while (0)
	71	#endif
	72
df9ee292 DH	73	/*
	74	* Wrap the arch provided IRQ routines to provide appropriate checks.
	75	*/
	76	#define raw_local_irq_disable() arch_local_irq_disable()
	77	#define raw_local_irq_enable() arch_local_irq_enable()
	78	#define raw_local_irq_save(flags) \
	79	do { \
	80	typecheck(unsigned long, flags); \
	81	flags = arch_local_irq_save(); \
	82	} while (0)
	83	#define raw_local_irq_restore(flags) \
	84	do { \
	85	typecheck(unsigned long, flags); \
	86	arch_local_irq_restore(flags); \
	87	} while (0)
	88	#define raw_local_save_flags(flags) \
	89	do { \
	90	typecheck(unsigned long, flags); \
	91	flags = arch_local_save_flags(); \
	92	} while (0)
	93	#define raw_irqs_disabled_flags(flags) \
	94	({ \
	95	typecheck(unsigned long, flags); \
	96	arch_irqs_disabled_flags(flags); \
	97	})
	98	#define raw_irqs_disabled() (arch_irqs_disabled())
	99	#define raw_safe_halt() arch_safe_halt()
de30a2b3	100
df9ee292 DH	101	/*
	102	* The local_irq_() APIs are equal to the raw_local_irq()
	103	* if !TRACE_IRQFLAGS.
	104	*/
db2dcb4f	105	#ifdef CONFIG_TRACE_IRQFLAGS
de30a2b3 IM	106	#define local_irq_enable() \
	107	do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
	108	#define local_irq_disable() \
	109	do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
3f307891 SR	110	#define local_irq_save(flags) \
3f307891 SR	111	do { \
3f307891 SR	112	raw_local_irq_save(flags); \
	113	trace_hardirqs_off(); \
	114	} while (0)
de30a2b3	115
3f307891 SR	116
	117	#define local_irq_restore(flags) \
	118	do { \
3f307891 SR	119	if (raw_irqs_disabled_flags(flags)) { \
	120	raw_local_irq_restore(flags); \
	121	trace_hardirqs_off(); \
	122	} else { \
	123	trace_hardirqs_on(); \
	124	raw_local_irq_restore(flags); \
	125	} \
de30a2b3	126	} while (0)
df9ee292 DH	127
	128	#define safe_halt() \
	129	do { \
	130	trace_hardirqs_on(); \
	131	raw_safe_halt(); \
3f307891	132	} while (0)
de30a2b3	133
de30a2b3	134
db2dcb4f	135	#else /* !CONFIG_TRACE_IRQFLAGS */
df9ee292 DH	136
	137	#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
	138	#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
	139	#define local_irq_save(flags) \
	140	do { \
	141	raw_local_irq_save(flags); \
	142	} while (0)
	143	#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
df9ee292 DH	144	#define safe_halt() do { raw_safe_halt(); } while (0)
df9ee292 DH	145
db2dcb4f JB	146	#endif /* CONFIG_TRACE_IRQFLAGS */
	147
	148	#define local_save_flags(flags) raw_local_save_flags(flags)
	149
	150	/*
	151	* Some architectures don't define arch_irqs_disabled(), so even if either
	152	* definition would be fine we need to use different ones for the time being
	153	* to avoid build issues.
	154	*/
	155	#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
	156	#define irqs_disabled() \
	157	({ \
	158	unsigned long _flags; \
	159	raw_local_save_flags(_flags); \
	160	raw_irqs_disabled_flags(_flags); \
	161	})
	162	#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
	163	#define irqs_disabled() raw_irqs_disabled()
40b1f4e5	164	#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
de30a2b3	165
db2dcb4f JB	166	#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
db2dcb4f JB	167
de30a2b3	168	#endif