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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>
17 #include <asm/percpu.h>
19 /* Currently lockdep_softirqs_on/off is used only by lockdep */
20 #ifdef CONFIG_PROVE_LOCKING
21 extern void lockdep_softirqs_on(unsigned long ip
);
22 extern void lockdep_softirqs_off(unsigned long ip
);
23 extern void lockdep_hardirqs_on_prepare(unsigned long ip
);
24 extern void lockdep_hardirqs_on(unsigned long ip
);
25 extern void lockdep_hardirqs_off(unsigned long ip
);
27 static inline void lockdep_softirqs_on(unsigned long ip
) { }
28 static inline void lockdep_softirqs_off(unsigned long ip
) { }
29 static inline void lockdep_hardirqs_on_prepare(unsigned long ip
) { }
30 static inline void lockdep_hardirqs_on(unsigned long ip
) { }
31 static inline void lockdep_hardirqs_off(unsigned long ip
) { }
34 #ifdef CONFIG_TRACE_IRQFLAGS
36 /* Per-task IRQ trace events information. */
37 struct irqtrace_events
{
38 unsigned int irq_events
;
39 unsigned long hardirq_enable_ip
;
40 unsigned long hardirq_disable_ip
;
41 unsigned int hardirq_enable_event
;
42 unsigned int hardirq_disable_event
;
43 unsigned long softirq_disable_ip
;
44 unsigned long softirq_enable_ip
;
45 unsigned int softirq_disable_event
;
46 unsigned int softirq_enable_event
;
49 DECLARE_PER_CPU(int, hardirqs_enabled
);
50 DECLARE_PER_CPU(int, hardirq_context
);
52 extern void trace_hardirqs_on_prepare(void);
53 extern void trace_hardirqs_off_finish(void);
54 extern void trace_hardirqs_on(void);
55 extern void trace_hardirqs_off(void);
57 # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context))
58 # define lockdep_softirq_context(p) ((p)->softirq_context)
59 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
60 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
61 # define lockdep_hardirq_enter() \
63 if (__this_cpu_inc_return(hardirq_context) == 1)\
64 current->hardirq_threaded = 0; \
66 # define lockdep_hardirq_threaded() \
68 current->hardirq_threaded = 1; \
70 # define lockdep_hardirq_exit() \
72 __this_cpu_dec(hardirq_context); \
74 # define lockdep_softirq_enter() \
76 current->softirq_context++; \
78 # define lockdep_softirq_exit() \
80 current->softirq_context--; \
83 # define lockdep_hrtimer_enter(__hrtimer) \
85 bool __expires_hardirq = true; \
87 if (!__hrtimer->is_hard) { \
88 current->irq_config = 1; \
89 __expires_hardirq = false; \
94 # define lockdep_hrtimer_exit(__expires_hardirq) \
96 if (!__expires_hardirq) \
97 current->irq_config = 0; \
100 # define lockdep_posixtimer_enter() \
102 current->irq_config = 1; \
105 # define lockdep_posixtimer_exit() \
107 current->irq_config = 0; \
110 # define lockdep_irq_work_enter(_flags) \
112 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
113 current->irq_config = 1; \
115 # define lockdep_irq_work_exit(_flags) \
117 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
118 current->irq_config = 0; \
122 # define trace_hardirqs_on_prepare() do { } while (0)
123 # define trace_hardirqs_off_finish() do { } while (0)
124 # define trace_hardirqs_on() do { } while (0)
125 # define trace_hardirqs_off() do { } while (0)
126 # define lockdep_hardirq_context() 0
127 # define lockdep_softirq_context(p) 0
128 # define lockdep_hardirqs_enabled() 0
129 # define lockdep_softirqs_enabled(p) 0
130 # define lockdep_hardirq_enter() do { } while (0)
131 # define lockdep_hardirq_threaded() do { } while (0)
132 # define lockdep_hardirq_exit() do { } while (0)
133 # define lockdep_softirq_enter() do { } while (0)
134 # define lockdep_softirq_exit() do { } while (0)
135 # define lockdep_hrtimer_enter(__hrtimer) false
136 # define lockdep_hrtimer_exit(__context) do { } while (0)
137 # define lockdep_posixtimer_enter() do { } while (0)
138 # define lockdep_posixtimer_exit() do { } while (0)
139 # define lockdep_irq_work_enter(__work) do { } while (0)
140 # define lockdep_irq_work_exit(__work) do { } while (0)
143 #if defined(CONFIG_IRQSOFF_TRACER) || \
144 defined(CONFIG_PREEMPT_TRACER)
145 extern void stop_critical_timings(void);
146 extern void start_critical_timings(void);
148 # define stop_critical_timings() do { } while (0)
149 # define start_critical_timings() do { } while (0)
152 #ifdef CONFIG_DEBUG_IRQFLAGS
153 extern void warn_bogus_irq_restore(void);
154 #define raw_check_bogus_irq_restore() \
156 if (unlikely(!arch_irqs_disabled())) \
157 warn_bogus_irq_restore(); \
160 #define raw_check_bogus_irq_restore() do { } while (0)
164 * Wrap the arch provided IRQ routines to provide appropriate checks.
166 #define raw_local_irq_disable() arch_local_irq_disable()
167 #define raw_local_irq_enable() arch_local_irq_enable()
168 #define raw_local_irq_save(flags) \
170 typecheck(unsigned long, flags); \
171 flags = arch_local_irq_save(); \
173 #define raw_local_irq_restore(flags) \
175 typecheck(unsigned long, flags); \
176 raw_check_bogus_irq_restore(); \
177 arch_local_irq_restore(flags); \
179 #define raw_local_save_flags(flags) \
181 typecheck(unsigned long, flags); \
182 flags = arch_local_save_flags(); \
184 #define raw_irqs_disabled_flags(flags) \
186 typecheck(unsigned long, flags); \
187 arch_irqs_disabled_flags(flags); \
189 #define raw_irqs_disabled() (arch_irqs_disabled())
190 #define raw_safe_halt() arch_safe_halt()
193 * The local_irq_*() APIs are equal to the raw_local_irq*()
194 * if !TRACE_IRQFLAGS.
196 #ifdef CONFIG_TRACE_IRQFLAGS
198 #define local_irq_enable() \
200 trace_hardirqs_on(); \
201 raw_local_irq_enable(); \
204 #define local_irq_disable() \
206 bool was_disabled = raw_irqs_disabled();\
207 raw_local_irq_disable(); \
209 trace_hardirqs_off(); \
212 #define local_irq_save(flags) \
214 raw_local_irq_save(flags); \
215 if (!raw_irqs_disabled_flags(flags)) \
216 trace_hardirqs_off(); \
219 #define local_irq_restore(flags) \
221 if (!raw_irqs_disabled_flags(flags)) \
222 trace_hardirqs_on(); \
223 raw_local_irq_restore(flags); \
226 #define safe_halt() \
228 trace_hardirqs_on(); \
233 #else /* !CONFIG_TRACE_IRQFLAGS */
235 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
236 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
237 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
238 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
239 #define safe_halt() do { raw_safe_halt(); } while (0)
241 #endif /* CONFIG_TRACE_IRQFLAGS */
243 #define local_save_flags(flags) raw_local_save_flags(flags)
246 * Some architectures don't define arch_irqs_disabled(), so even if either
247 * definition would be fine we need to use different ones for the time being
248 * to avoid build issues.
250 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
251 #define irqs_disabled() \
253 unsigned long _flags; \
254 raw_local_save_flags(_flags); \
255 raw_irqs_disabled_flags(_flags); \
257 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
258 #define irqs_disabled() raw_irqs_disabled()
259 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
261 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)