1 /* SPDX-License-Identifier: GPL-2.0 */
3 * include/linux/irqflags.h
5 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
6 * provide callbacks for transitions between ON and OFF states.
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.
12 #ifndef _LINUX_TRACE_IRQFLAGS_H
13 #define _LINUX_TRACE_IRQFLAGS_H
15 #include <linux/typecheck.h>
16 #include <asm/irqflags.h>
18 /* Currently lockdep_softirqs_on/off is used only by lockdep */
19 #ifdef CONFIG_PROVE_LOCKING
20 extern void lockdep_softirqs_on(unsigned long ip);
21 extern void lockdep_softirqs_off(unsigned long ip);
22 extern void lockdep_hardirqs_on_prepare(unsigned long ip);
23 extern void lockdep_hardirqs_on(unsigned long ip);
24 extern void lockdep_hardirqs_off(unsigned long ip);
26 static inline void lockdep_softirqs_on(unsigned long ip) { }
27 static inline void lockdep_softirqs_off(unsigned long ip) { }
28 static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { }
29 static inline void lockdep_hardirqs_on(unsigned long ip) { }
30 static inline void lockdep_hardirqs_off(unsigned long ip) { }
33 #ifdef CONFIG_TRACE_IRQFLAGS
34 extern void trace_hardirqs_on_prepare(void);
35 extern void trace_hardirqs_off_finish(void);
36 extern void trace_hardirqs_on(void);
37 extern void trace_hardirqs_off(void);
38 # define lockdep_hardirq_context(p) ((p)->hardirq_context)
39 # define lockdep_softirq_context(p) ((p)->softirq_context)
40 # define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
41 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
42 # define lockdep_hardirq_enter() \
44 if (!current->hardirq_context++) \
45 current->hardirq_threaded = 0; \
47 # define lockdep_hardirq_threaded() \
49 current->hardirq_threaded = 1; \
51 # define lockdep_hardirq_exit() \
53 current->hardirq_context--; \
55 # define lockdep_softirq_enter() \
57 current->softirq_context++; \
59 # define lockdep_softirq_exit() \
61 current->softirq_context--; \
64 # define lockdep_hrtimer_enter(__hrtimer) \
66 bool __expires_hardirq = true; \
68 if (!__hrtimer->is_hard) { \
69 current->irq_config = 1; \
70 __expires_hardirq = false; \
75 # define lockdep_hrtimer_exit(__expires_hardirq) \
77 if (!__expires_hardirq) \
78 current->irq_config = 0; \
81 # define lockdep_posixtimer_enter() \
83 current->irq_config = 1; \
86 # define lockdep_posixtimer_exit() \
88 current->irq_config = 0; \
91 # define lockdep_irq_work_enter(__work) \
93 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
94 current->irq_config = 1; \
96 # define lockdep_irq_work_exit(__work) \
98 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
99 current->irq_config = 0; \
103 # define trace_hardirqs_on_prepare() do { } while (0)
104 # define trace_hardirqs_off_finish() do { } while (0)
105 # define trace_hardirqs_on() do { } while (0)
106 # define trace_hardirqs_off() do { } while (0)
107 # define lockdep_hardirq_context(p) 0
108 # define lockdep_softirq_context(p) 0
109 # define lockdep_hardirqs_enabled(p) 0
110 # define lockdep_softirqs_enabled(p) 0
111 # define lockdep_hardirq_enter() do { } while (0)
112 # define lockdep_hardirq_threaded() do { } while (0)
113 # define lockdep_hardirq_exit() do { } while (0)
114 # define lockdep_softirq_enter() do { } while (0)
115 # define lockdep_softirq_exit() do { } while (0)
116 # define lockdep_hrtimer_enter(__hrtimer) false
117 # define lockdep_hrtimer_exit(__context) do { } while (0)
118 # define lockdep_posixtimer_enter() do { } while (0)
119 # define lockdep_posixtimer_exit() do { } while (0)
120 # define lockdep_irq_work_enter(__work) do { } while (0)
121 # define lockdep_irq_work_exit(__work) do { } while (0)
124 #if defined(CONFIG_IRQSOFF_TRACER) || \
125 defined(CONFIG_PREEMPT_TRACER)
126 extern void stop_critical_timings(void);
127 extern void start_critical_timings(void);
129 # define stop_critical_timings() do { } while (0)
130 # define start_critical_timings() do { } while (0)
134 * Wrap the arch provided IRQ routines to provide appropriate checks.
136 #define raw_local_irq_disable() arch_local_irq_disable()
137 #define raw_local_irq_enable() arch_local_irq_enable()
138 #define raw_local_irq_save(flags) \
140 typecheck(unsigned long, flags); \
141 flags = arch_local_irq_save(); \
143 #define raw_local_irq_restore(flags) \
145 typecheck(unsigned long, flags); \
146 arch_local_irq_restore(flags); \
148 #define raw_local_save_flags(flags) \
150 typecheck(unsigned long, flags); \
151 flags = arch_local_save_flags(); \
153 #define raw_irqs_disabled_flags(flags) \
155 typecheck(unsigned long, flags); \
156 arch_irqs_disabled_flags(flags); \
158 #define raw_irqs_disabled() (arch_irqs_disabled())
159 #define raw_safe_halt() arch_safe_halt()
162 * The local_irq_*() APIs are equal to the raw_local_irq*()
163 * if !TRACE_IRQFLAGS.
165 #ifdef CONFIG_TRACE_IRQFLAGS
166 #define local_irq_enable() \
167 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
168 #define local_irq_disable() \
169 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
170 #define local_irq_save(flags) \
172 raw_local_irq_save(flags); \
173 trace_hardirqs_off(); \
177 #define local_irq_restore(flags) \
179 if (raw_irqs_disabled_flags(flags)) { \
180 raw_local_irq_restore(flags); \
181 trace_hardirqs_off(); \
183 trace_hardirqs_on(); \
184 raw_local_irq_restore(flags); \
188 #define safe_halt() \
190 trace_hardirqs_on(); \
195 #else /* !CONFIG_TRACE_IRQFLAGS */
197 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
198 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
199 #define local_irq_save(flags) \
201 raw_local_irq_save(flags); \
203 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
204 #define safe_halt() do { raw_safe_halt(); } while (0)
206 #endif /* CONFIG_TRACE_IRQFLAGS */
208 #define local_save_flags(flags) raw_local_save_flags(flags)
211 * Some architectures don't define arch_irqs_disabled(), so even if either
212 * definition would be fine we need to use different ones for the time being
213 * to avoid build issues.
215 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
216 #define irqs_disabled() \
218 unsigned long _flags; \
219 raw_local_save_flags(_flags); \
220 raw_irqs_disabled_flags(_flags); \
222 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
223 #define irqs_disabled() raw_irqs_disabled()
224 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
226 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)