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);
56 # define lockdep_hardirq_context() (this_cpu_read(hardirq_context))
57 # define lockdep_softirq_context(p) ((p)->softirq_context)
58 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
59 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
60 # define lockdep_hardirq_enter() \
62 if (this_cpu_inc_return(hardirq_context) == 1) \
63 current->hardirq_threaded = 0; \
65 # define lockdep_hardirq_threaded() \
67 current->hardirq_threaded = 1; \
69 # define lockdep_hardirq_exit() \
71 this_cpu_dec(hardirq_context); \
73 # define lockdep_softirq_enter() \
75 current->softirq_context++; \
77 # define lockdep_softirq_exit() \
79 current->softirq_context--; \
82 # define lockdep_hrtimer_enter(__hrtimer) \
84 bool __expires_hardirq = true; \
86 if (!__hrtimer->is_hard) { \
87 current->irq_config = 1; \
88 __expires_hardirq = false; \
93 # define lockdep_hrtimer_exit(__expires_hardirq) \
95 if (!__expires_hardirq) \
96 current->irq_config = 0; \
99 # define lockdep_posixtimer_enter() \
101 current->irq_config = 1; \
104 # define lockdep_posixtimer_exit() \
106 current->irq_config = 0; \
109 # define lockdep_irq_work_enter(__work) \
111 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
112 current->irq_config = 1; \
114 # define lockdep_irq_work_exit(__work) \
116 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
117 current->irq_config = 0; \
121 # define trace_hardirqs_on_prepare() do { } while (0)
122 # define trace_hardirqs_off_finish() do { } while (0)
123 # define trace_hardirqs_on() do { } while (0)
124 # define trace_hardirqs_off() do { } while (0)
125 # define lockdep_hardirq_context() 0
126 # define lockdep_softirq_context(p) 0
127 # define lockdep_hardirqs_enabled() 0
128 # define lockdep_softirqs_enabled(p) 0
129 # define lockdep_hardirq_enter() do { } while (0)
130 # define lockdep_hardirq_threaded() do { } while (0)
131 # define lockdep_hardirq_exit() do { } while (0)
132 # define lockdep_softirq_enter() do { } while (0)
133 # define lockdep_softirq_exit() do { } while (0)
134 # define lockdep_hrtimer_enter(__hrtimer) false
135 # define lockdep_hrtimer_exit(__context) do { } while (0)
136 # define lockdep_posixtimer_enter() do { } while (0)
137 # define lockdep_posixtimer_exit() do { } while (0)
138 # define lockdep_irq_work_enter(__work) do { } while (0)
139 # define lockdep_irq_work_exit(__work) do { } while (0)
142 #if defined(CONFIG_IRQSOFF_TRACER) || \
143 defined(CONFIG_PREEMPT_TRACER)
144 extern void stop_critical_timings(void);
145 extern void start_critical_timings(void);
147 # define stop_critical_timings() do { } while (0)
148 # define start_critical_timings() do { } while (0)
152 * Wrap the arch provided IRQ routines to provide appropriate checks.
154 #define raw_local_irq_disable() arch_local_irq_disable()
155 #define raw_local_irq_enable() arch_local_irq_enable()
156 #define raw_local_irq_save(flags) \
158 typecheck(unsigned long, flags); \
159 flags = arch_local_irq_save(); \
161 #define raw_local_irq_restore(flags) \
163 typecheck(unsigned long, flags); \
164 arch_local_irq_restore(flags); \
166 #define raw_local_save_flags(flags) \
168 typecheck(unsigned long, flags); \
169 flags = arch_local_save_flags(); \
171 #define raw_irqs_disabled_flags(flags) \
173 typecheck(unsigned long, flags); \
174 arch_irqs_disabled_flags(flags); \
176 #define raw_irqs_disabled() (arch_irqs_disabled())
177 #define raw_safe_halt() arch_safe_halt()
180 * The local_irq_*() APIs are equal to the raw_local_irq*()
181 * if !TRACE_IRQFLAGS.
183 #ifdef CONFIG_TRACE_IRQFLAGS
184 #define local_irq_enable() \
185 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
186 #define local_irq_disable() \
187 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
188 #define local_irq_save(flags) \
190 raw_local_irq_save(flags); \
191 trace_hardirqs_off(); \
195 #define local_irq_restore(flags) \
197 if (raw_irqs_disabled_flags(flags)) { \
198 raw_local_irq_restore(flags); \
199 trace_hardirqs_off(); \
201 trace_hardirqs_on(); \
202 raw_local_irq_restore(flags); \
206 #define safe_halt() \
208 trace_hardirqs_on(); \
213 #else /* !CONFIG_TRACE_IRQFLAGS */
215 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
216 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
217 #define local_irq_save(flags) \
219 raw_local_irq_save(flags); \
221 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
222 #define safe_halt() do { raw_safe_halt(); } while (0)
224 #endif /* CONFIG_TRACE_IRQFLAGS */
226 #define local_save_flags(flags) raw_local_save_flags(flags)
229 * Some architectures don't define arch_irqs_disabled(), so even if either
230 * definition would be fine we need to use different ones for the time being
231 * to avoid build issues.
233 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
234 #define irqs_disabled() \
236 unsigned long _flags; \
237 raw_local_save_flags(_flags); \
238 raw_irqs_disabled_flags(_flags); \
240 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
241 #define irqs_disabled() raw_irqs_disabled()
242 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
244 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)