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(void);
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(void) { }
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); \
75 # define lockdep_hrtimer_enter(__hrtimer) \
77 bool __expires_hardirq = true; \
79 if (!__hrtimer->is_hard) { \
80 current->irq_config = 1; \
81 __expires_hardirq = false; \
86 # define lockdep_hrtimer_exit(__expires_hardirq) \
88 if (!__expires_hardirq) \
89 current->irq_config = 0; \
92 # define lockdep_posixtimer_enter() \
94 current->irq_config = 1; \
97 # define lockdep_posixtimer_exit() \
99 current->irq_config = 0; \
102 # define lockdep_irq_work_enter(_flags) \
104 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
105 current->irq_config = 1; \
107 # define lockdep_irq_work_exit(_flags) \
109 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
110 current->irq_config = 0; \
114 # define trace_hardirqs_on_prepare() do { } while (0)
115 # define trace_hardirqs_off_finish() do { } while (0)
116 # define trace_hardirqs_on() do { } while (0)
117 # define trace_hardirqs_off() do { } while (0)
118 # define lockdep_hardirq_context() 0
119 # define lockdep_softirq_context(p) 0
120 # define lockdep_hardirqs_enabled() 0
121 # define lockdep_softirqs_enabled(p) 0
122 # define lockdep_hardirq_enter() do { } while (0)
123 # define lockdep_hardirq_threaded() do { } while (0)
124 # define lockdep_hardirq_exit() do { } while (0)
125 # define lockdep_softirq_enter() do { } while (0)
126 # define lockdep_softirq_exit() do { } while (0)
127 # define lockdep_hrtimer_enter(__hrtimer) false
128 # define lockdep_hrtimer_exit(__context) do { } while (0)
129 # define lockdep_posixtimer_enter() do { } while (0)
130 # define lockdep_posixtimer_exit() do { } while (0)
131 # define lockdep_irq_work_enter(__work) do { } while (0)
132 # define lockdep_irq_work_exit(__work) do { } while (0)
135 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT)
136 # define lockdep_softirq_enter() \
138 current->softirq_context++; \
140 # define lockdep_softirq_exit() \
142 current->softirq_context--; \
146 # define lockdep_softirq_enter() do { } while (0)
147 # define lockdep_softirq_exit() do { } while (0)
150 #if defined(CONFIG_IRQSOFF_TRACER) || \
151 defined(CONFIG_PREEMPT_TRACER)
152 extern void stop_critical_timings(void);
153 extern void start_critical_timings(void);
155 # define stop_critical_timings() do { } while (0)
156 # define start_critical_timings() do { } while (0)
159 #ifdef CONFIG_DEBUG_IRQFLAGS
160 extern void warn_bogus_irq_restore(void);
161 #define raw_check_bogus_irq_restore() \
163 if (unlikely(!arch_irqs_disabled())) \
164 warn_bogus_irq_restore(); \
167 #define raw_check_bogus_irq_restore() do { } while (0)
171 * Wrap the arch provided IRQ routines to provide appropriate checks.
173 #define raw_local_irq_disable() arch_local_irq_disable()
174 #define raw_local_irq_enable() arch_local_irq_enable()
175 #define raw_local_irq_save(flags) \
177 typecheck(unsigned long, flags); \
178 flags = arch_local_irq_save(); \
180 #define raw_local_irq_restore(flags) \
182 typecheck(unsigned long, flags); \
183 raw_check_bogus_irq_restore(); \
184 arch_local_irq_restore(flags); \
186 #define raw_local_save_flags(flags) \
188 typecheck(unsigned long, flags); \
189 flags = arch_local_save_flags(); \
191 #define raw_irqs_disabled_flags(flags) \
193 typecheck(unsigned long, flags); \
194 arch_irqs_disabled_flags(flags); \
196 #define raw_irqs_disabled() (arch_irqs_disabled())
197 #define raw_safe_halt() arch_safe_halt()
200 * The local_irq_*() APIs are equal to the raw_local_irq*()
201 * if !TRACE_IRQFLAGS.
203 #ifdef CONFIG_TRACE_IRQFLAGS
205 #define local_irq_enable() \
207 trace_hardirqs_on(); \
208 raw_local_irq_enable(); \
211 #define local_irq_disable() \
213 bool was_disabled = raw_irqs_disabled();\
214 raw_local_irq_disable(); \
216 trace_hardirqs_off(); \
219 #define local_irq_save(flags) \
221 raw_local_irq_save(flags); \
222 if (!raw_irqs_disabled_flags(flags)) \
223 trace_hardirqs_off(); \
226 #define local_irq_restore(flags) \
228 if (!raw_irqs_disabled_flags(flags)) \
229 trace_hardirqs_on(); \
230 raw_local_irq_restore(flags); \
233 #define safe_halt() \
235 trace_hardirqs_on(); \
240 #else /* !CONFIG_TRACE_IRQFLAGS */
242 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
243 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
244 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
245 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
246 #define safe_halt() do { raw_safe_halt(); } while (0)
248 #endif /* CONFIG_TRACE_IRQFLAGS */
250 #define local_save_flags(flags) raw_local_save_flags(flags)
253 * Some architectures don't define arch_irqs_disabled(), so even if either
254 * definition would be fine we need to use different ones for the time being
255 * to avoid build issues.
257 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
258 #define irqs_disabled() \
260 unsigned long _flags; \
261 raw_local_save_flags(_flags); \
262 raw_irqs_disabled_flags(_flags); \
264 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
265 #define irqs_disabled() raw_irqs_disabled()
266 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
268 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)