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(unsigned long ip);
23 extern void lockdep_hardirqs_off(unsigned long ip);
25 static inline void lockdep_softirqs_on(unsigned long ip) { }
26 static inline void lockdep_softirqs_off(unsigned long ip) { }
27 static inline void lockdep_hardirqs_on(unsigned long ip) { }
28 static inline void lockdep_hardirqs_off(unsigned long ip) { }
31 #ifdef CONFIG_TRACE_IRQFLAGS
32 extern void trace_hardirqs_on(void);
33 extern void trace_hardirqs_off(void);
34 # define lockdep_hardirq_context(p) ((p)->hardirq_context)
35 # define lockdep_softirq_context(p) ((p)->softirq_context)
36 # define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
37 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
38 # define lockdep_hardirq_enter() \
40 if (!current->hardirq_context++) \
41 current->hardirq_threaded = 0; \
43 # define lockdep_hardirq_threaded() \
45 current->hardirq_threaded = 1; \
47 # define lockdep_hardirq_exit() \
49 current->hardirq_context--; \
51 # define lockdep_softirq_enter() \
53 current->softirq_context++; \
55 # define lockdep_softirq_exit() \
57 current->softirq_context--; \
60 # define lockdep_hrtimer_enter(__hrtimer) \
62 bool __expires_hardirq = true; \
64 if (!__hrtimer->is_hard) { \
65 current->irq_config = 1; \
66 __expires_hardirq = false; \
71 # define lockdep_hrtimer_exit(__expires_hardirq) \
73 if (!__expires_hardirq) \
74 current->irq_config = 0; \
77 # define lockdep_posixtimer_enter() \
79 current->irq_config = 1; \
82 # define lockdep_posixtimer_exit() \
84 current->irq_config = 0; \
87 # define lockdep_irq_work_enter(__work) \
89 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
90 current->irq_config = 1; \
92 # define lockdep_irq_work_exit(__work) \
94 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
95 current->irq_config = 0; \
99 # define trace_hardirqs_on() do { } while (0)
100 # define trace_hardirqs_off() do { } while (0)
101 # define lockdep_hardirq_context(p) 0
102 # define lockdep_softirq_context(p) 0
103 # define lockdep_hardirqs_enabled(p) 0
104 # define lockdep_softirqs_enabled(p) 0
105 # define lockdep_hardirq_enter() do { } while (0)
106 # define lockdep_hardirq_threaded() do { } while (0)
107 # define lockdep_hardirq_exit() do { } while (0)
108 # define lockdep_softirq_enter() do { } while (0)
109 # define lockdep_softirq_exit() do { } while (0)
110 # define lockdep_hrtimer_enter(__hrtimer) false
111 # define lockdep_hrtimer_exit(__context) do { } while (0)
112 # define lockdep_posixtimer_enter() do { } while (0)
113 # define lockdep_posixtimer_exit() do { } while (0)
114 # define lockdep_irq_work_enter(__work) do { } while (0)
115 # define lockdep_irq_work_exit(__work) do { } while (0)
118 #if defined(CONFIG_IRQSOFF_TRACER) || \
119 defined(CONFIG_PREEMPT_TRACER)
120 extern void stop_critical_timings(void);
121 extern void start_critical_timings(void);
123 # define stop_critical_timings() do { } while (0)
124 # define start_critical_timings() do { } while (0)
128 * Wrap the arch provided IRQ routines to provide appropriate checks.
130 #define raw_local_irq_disable() arch_local_irq_disable()
131 #define raw_local_irq_enable() arch_local_irq_enable()
132 #define raw_local_irq_save(flags) \
134 typecheck(unsigned long, flags); \
135 flags = arch_local_irq_save(); \
137 #define raw_local_irq_restore(flags) \
139 typecheck(unsigned long, flags); \
140 arch_local_irq_restore(flags); \
142 #define raw_local_save_flags(flags) \
144 typecheck(unsigned long, flags); \
145 flags = arch_local_save_flags(); \
147 #define raw_irqs_disabled_flags(flags) \
149 typecheck(unsigned long, flags); \
150 arch_irqs_disabled_flags(flags); \
152 #define raw_irqs_disabled() (arch_irqs_disabled())
153 #define raw_safe_halt() arch_safe_halt()
156 * The local_irq_*() APIs are equal to the raw_local_irq*()
157 * if !TRACE_IRQFLAGS.
159 #ifdef CONFIG_TRACE_IRQFLAGS
160 #define local_irq_enable() \
161 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
162 #define local_irq_disable() \
163 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
164 #define local_irq_save(flags) \
166 raw_local_irq_save(flags); \
167 trace_hardirqs_off(); \
171 #define local_irq_restore(flags) \
173 if (raw_irqs_disabled_flags(flags)) { \
174 raw_local_irq_restore(flags); \
175 trace_hardirqs_off(); \
177 trace_hardirqs_on(); \
178 raw_local_irq_restore(flags); \
182 #define safe_halt() \
184 trace_hardirqs_on(); \
189 #else /* !CONFIG_TRACE_IRQFLAGS */
191 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
192 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
193 #define local_irq_save(flags) \
195 raw_local_irq_save(flags); \
197 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
198 #define safe_halt() do { raw_safe_halt(); } while (0)
200 #endif /* CONFIG_TRACE_IRQFLAGS */
202 #define local_save_flags(flags) raw_local_save_flags(flags)
205 * Some architectures don't define arch_irqs_disabled(), so even if either
206 * definition would be fine we need to use different ones for the time being
207 * to avoid build issues.
209 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
210 #define irqs_disabled() \
212 unsigned long _flags; \
213 raw_local_save_flags(_flags); \
214 raw_irqs_disabled_flags(_flags); \
216 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
217 #define irqs_disabled() raw_irqs_disabled()
218 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
220 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)