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/irqflags_types.h>
16 #include <linux/typecheck.h>
17 #include <linux/cleanup.h>
18 #include <asm/irqflags.h>
19 #include <asm/percpu.h>
21 /* Currently lockdep_softirqs_on/off is used only by lockdep */
22 #ifdef CONFIG_PROVE_LOCKING
23 extern void lockdep_softirqs_on(unsigned long ip);
24 extern void lockdep_softirqs_off(unsigned long ip);
25 extern void lockdep_hardirqs_on_prepare(void);
26 extern void lockdep_hardirqs_on(unsigned long ip);
27 extern void lockdep_hardirqs_off(unsigned long ip);
29 static inline void lockdep_softirqs_on(unsigned long ip) { }
30 static inline void lockdep_softirqs_off(unsigned long ip) { }
31 static inline void lockdep_hardirqs_on_prepare(void) { }
32 static inline void lockdep_hardirqs_on(unsigned long ip) { }
33 static inline void lockdep_hardirqs_off(unsigned long ip) { }
36 #ifdef CONFIG_TRACE_IRQFLAGS
38 DECLARE_PER_CPU(int, hardirqs_enabled);
39 DECLARE_PER_CPU(int, hardirq_context);
41 extern void trace_hardirqs_on_prepare(void);
42 extern void trace_hardirqs_off_finish(void);
43 extern void trace_hardirqs_on(void);
44 extern void trace_hardirqs_off(void);
46 # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context))
47 # define lockdep_softirq_context(p) ((p)->softirq_context)
48 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
49 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
50 # define lockdep_hardirq_enter() \
52 if (__this_cpu_inc_return(hardirq_context) == 1)\
53 current->hardirq_threaded = 0; \
55 # define lockdep_hardirq_threaded() \
57 current->hardirq_threaded = 1; \
59 # define lockdep_hardirq_exit() \
61 __this_cpu_dec(hardirq_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(_flags) \
93 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
94 current->irq_config = 1; \
96 # define lockdep_irq_work_exit(_flags) \
98 if (!((_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() 0
108 # define lockdep_softirq_context(p) 0
109 # define lockdep_hardirqs_enabled() 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 { (void)(__context); } 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_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT)
125 # define lockdep_softirq_enter() \
127 current->softirq_context++; \
129 # define lockdep_softirq_exit() \
131 current->softirq_context--; \
135 # define lockdep_softirq_enter() do { } while (0)
136 # define lockdep_softirq_exit() do { } while (0)
139 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void);
144 # define stop_critical_timings() do { } while (0)
145 # define start_critical_timings() do { } while (0)
148 #ifdef CONFIG_DEBUG_IRQFLAGS
149 extern void warn_bogus_irq_restore(void);
150 #define raw_check_bogus_irq_restore() \
152 if (unlikely(!arch_irqs_disabled())) \
153 warn_bogus_irq_restore(); \
156 #define raw_check_bogus_irq_restore() do { } while (0)
160 * Wrap the arch provided IRQ routines to provide appropriate checks.
162 #define raw_local_irq_disable() arch_local_irq_disable()
163 #define raw_local_irq_enable() arch_local_irq_enable()
164 #define raw_local_irq_save(flags) \
166 typecheck(unsigned long, flags); \
167 flags = arch_local_irq_save(); \
169 #define raw_local_irq_restore(flags) \
171 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); \
173 arch_local_irq_restore(flags); \
175 #define raw_local_save_flags(flags) \
177 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags(); \
180 #define raw_irqs_disabled_flags(flags) \
182 typecheck(unsigned long, flags); \
183 arch_irqs_disabled_flags(flags); \
185 #define raw_irqs_disabled() (arch_irqs_disabled())
186 #define raw_safe_halt() arch_safe_halt()
189 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS.
192 #ifdef CONFIG_TRACE_IRQFLAGS
194 #define local_irq_enable() \
196 trace_hardirqs_on(); \
197 raw_local_irq_enable(); \
200 #define local_irq_disable() \
202 bool was_disabled = raw_irqs_disabled();\
203 raw_local_irq_disable(); \
205 trace_hardirqs_off(); \
208 #define local_irq_save(flags) \
210 raw_local_irq_save(flags); \
211 if (!raw_irqs_disabled_flags(flags)) \
212 trace_hardirqs_off(); \
215 #define local_irq_restore(flags) \
217 if (!raw_irqs_disabled_flags(flags)) \
218 trace_hardirqs_on(); \
219 raw_local_irq_restore(flags); \
222 #define safe_halt() \
224 trace_hardirqs_on(); \
229 #else /* !CONFIG_TRACE_IRQFLAGS */
231 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
232 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
233 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
234 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
235 #define safe_halt() do { raw_safe_halt(); } while (0)
237 #endif /* CONFIG_TRACE_IRQFLAGS */
239 #define local_save_flags(flags) raw_local_save_flags(flags)
242 * Some architectures don't define arch_irqs_disabled(), so even if either
243 * definition would be fine we need to use different ones for the time being
244 * to avoid build issues.
246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247 #define irqs_disabled() \
249 unsigned long _flags; \
250 raw_local_save_flags(_flags); \
251 raw_irqs_disabled_flags(_flags); \
253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254 #define irqs_disabled() raw_irqs_disabled()
255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
257 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
259 DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), local_irq_enable())
260 DEFINE_LOCK_GUARD_0(irqsave,
261 local_irq_save(_T->flags),
262 local_irq_restore(_T->flags),