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 <linux/cleanup.h>
17 #include <asm/irqflags.h>
18 #include <asm/percpu.h>
20 /* Currently lockdep_softirqs_on/off is used only by lockdep */
21 #ifdef CONFIG_PROVE_LOCKING
22 extern void lockdep_softirqs_on(unsigned long ip);
23 extern void lockdep_softirqs_off(unsigned long ip);
24 extern void lockdep_hardirqs_on_prepare(void);
25 extern void lockdep_hardirqs_on(unsigned long ip);
26 extern void lockdep_hardirqs_off(unsigned long ip);
28 static inline void lockdep_softirqs_on(unsigned long ip) { }
29 static inline void lockdep_softirqs_off(unsigned long ip) { }
30 static inline void lockdep_hardirqs_on_prepare(void) { }
31 static inline void lockdep_hardirqs_on(unsigned long ip) { }
32 static inline void lockdep_hardirqs_off(unsigned long ip) { }
35 #ifdef CONFIG_TRACE_IRQFLAGS
37 /* Per-task IRQ trace events information. */
38 struct irqtrace_events {
39 unsigned int irq_events;
40 unsigned long hardirq_enable_ip;
41 unsigned long hardirq_disable_ip;
42 unsigned int hardirq_enable_event;
43 unsigned int hardirq_disable_event;
44 unsigned long softirq_disable_ip;
45 unsigned long softirq_enable_ip;
46 unsigned int softirq_disable_event;
47 unsigned int softirq_enable_event;
50 DECLARE_PER_CPU(int, hardirqs_enabled);
51 DECLARE_PER_CPU(int, hardirq_context);
53 extern void trace_hardirqs_on_prepare(void);
54 extern void trace_hardirqs_off_finish(void);
55 extern void trace_hardirqs_on(void);
56 extern void trace_hardirqs_off(void);
58 # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context))
59 # define lockdep_softirq_context(p) ((p)->softirq_context)
60 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
61 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
62 # define lockdep_hardirq_enter() \
64 if (__this_cpu_inc_return(hardirq_context) == 1)\
65 current->hardirq_threaded = 0; \
67 # define lockdep_hardirq_threaded() \
69 current->hardirq_threaded = 1; \
71 # define lockdep_hardirq_exit() \
73 __this_cpu_dec(hardirq_context); \
76 # define lockdep_hrtimer_enter(__hrtimer) \
78 bool __expires_hardirq = true; \
80 if (!__hrtimer->is_hard) { \
81 current->irq_config = 1; \
82 __expires_hardirq = false; \
87 # define lockdep_hrtimer_exit(__expires_hardirq) \
89 if (!__expires_hardirq) \
90 current->irq_config = 0; \
93 # define lockdep_posixtimer_enter() \
95 current->irq_config = 1; \
98 # define lockdep_posixtimer_exit() \
100 current->irq_config = 0; \
103 # define lockdep_irq_work_enter(_flags) \
105 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
106 current->irq_config = 1; \
108 # define lockdep_irq_work_exit(_flags) \
110 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
111 current->irq_config = 0; \
115 # define trace_hardirqs_on_prepare() do { } while (0)
116 # define trace_hardirqs_off_finish() do { } while (0)
117 # define trace_hardirqs_on() do { } while (0)
118 # define trace_hardirqs_off() do { } while (0)
119 # define lockdep_hardirq_context() 0
120 # define lockdep_softirq_context(p) 0
121 # define lockdep_hardirqs_enabled() 0
122 # define lockdep_softirqs_enabled(p) 0
123 # define lockdep_hardirq_enter() do { } while (0)
124 # define lockdep_hardirq_threaded() do { } while (0)
125 # define lockdep_hardirq_exit() do { } while (0)
126 # define lockdep_softirq_enter() do { } while (0)
127 # define lockdep_softirq_exit() do { } while (0)
128 # define lockdep_hrtimer_enter(__hrtimer) false
129 # define lockdep_hrtimer_exit(__context) do { } while (0)
130 # define lockdep_posixtimer_enter() do { } while (0)
131 # define lockdep_posixtimer_exit() do { } while (0)
132 # define lockdep_irq_work_enter(__work) do { } while (0)
133 # define lockdep_irq_work_exit(__work) do { } while (0)
136 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT)
137 # define lockdep_softirq_enter() \
139 current->softirq_context++; \
141 # define lockdep_softirq_exit() \
143 current->softirq_context--; \
147 # define lockdep_softirq_enter() do { } while (0)
148 # define lockdep_softirq_exit() do { } while (0)
151 #if defined(CONFIG_IRQSOFF_TRACER) || \
152 defined(CONFIG_PREEMPT_TRACER)
153 extern void stop_critical_timings(void);
154 extern void start_critical_timings(void);
156 # define stop_critical_timings() do { } while (0)
157 # define start_critical_timings() do { } while (0)
160 #ifdef CONFIG_DEBUG_IRQFLAGS
161 extern void warn_bogus_irq_restore(void);
162 #define raw_check_bogus_irq_restore() \
164 if (unlikely(!arch_irqs_disabled())) \
165 warn_bogus_irq_restore(); \
168 #define raw_check_bogus_irq_restore() do { } while (0)
172 * Wrap the arch provided IRQ routines to provide appropriate checks.
174 #define raw_local_irq_disable() arch_local_irq_disable()
175 #define raw_local_irq_enable() arch_local_irq_enable()
176 #define raw_local_irq_save(flags) \
178 typecheck(unsigned long, flags); \
179 flags = arch_local_irq_save(); \
181 #define raw_local_irq_restore(flags) \
183 typecheck(unsigned long, flags); \
184 raw_check_bogus_irq_restore(); \
185 arch_local_irq_restore(flags); \
187 #define raw_local_save_flags(flags) \
189 typecheck(unsigned long, flags); \
190 flags = arch_local_save_flags(); \
192 #define raw_irqs_disabled_flags(flags) \
194 typecheck(unsigned long, flags); \
195 arch_irqs_disabled_flags(flags); \
197 #define raw_irqs_disabled() (arch_irqs_disabled())
198 #define raw_safe_halt() arch_safe_halt()
201 * The local_irq_*() APIs are equal to the raw_local_irq*()
202 * if !TRACE_IRQFLAGS.
204 #ifdef CONFIG_TRACE_IRQFLAGS
206 #define local_irq_enable() \
208 trace_hardirqs_on(); \
209 raw_local_irq_enable(); \
212 #define local_irq_disable() \
214 bool was_disabled = raw_irqs_disabled();\
215 raw_local_irq_disable(); \
217 trace_hardirqs_off(); \
220 #define local_irq_save(flags) \
222 raw_local_irq_save(flags); \
223 if (!raw_irqs_disabled_flags(flags)) \
224 trace_hardirqs_off(); \
227 #define local_irq_restore(flags) \
229 if (!raw_irqs_disabled_flags(flags)) \
230 trace_hardirqs_on(); \
231 raw_local_irq_restore(flags); \
234 #define safe_halt() \
236 trace_hardirqs_on(); \
241 #else /* !CONFIG_TRACE_IRQFLAGS */
243 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
244 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
245 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
246 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
247 #define safe_halt() do { raw_safe_halt(); } while (0)
249 #endif /* CONFIG_TRACE_IRQFLAGS */
251 #define local_save_flags(flags) raw_local_save_flags(flags)
254 * Some architectures don't define arch_irqs_disabled(), so even if either
255 * definition would be fine we need to use different ones for the time being
256 * to avoid build issues.
258 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
259 #define irqs_disabled() \
261 unsigned long _flags; \
262 raw_local_save_flags(_flags); \
263 raw_irqs_disabled_flags(_flags); \
265 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
266 #define irqs_disabled() raw_irqs_disabled()
267 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
269 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
271 DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), local_irq_enable())
272 DEFINE_LOCK_GUARD_0(irqsave,
273 local_irq_save(_T->flags),
274 local_irq_restore(_T->flags),