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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/linux/irqflags.h
4 *
5 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
6 * provide callbacks for transitions between ON and OFF states.
7 *
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.
11 */
12#ifndef _LINUX_TRACE_IRQFLAGS_H
13#define _LINUX_TRACE_IRQFLAGS_H
14
15#include <linux/typecheck.h>
16#include <asm/irqflags.h>
17#include <asm/percpu.h>
18
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);
26#else
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) { }
32#endif
33
34#ifdef CONFIG_TRACE_IRQFLAGS
35
36/* Per-task IRQ trace events information. */
37struct 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;
47};
48
49DECLARE_PER_CPU(int, hardirqs_enabled);
50DECLARE_PER_CPU(int, hardirq_context);
51
52extern void trace_hardirqs_on_prepare(void);
53extern void trace_hardirqs_off_finish(void);
54extern void trace_hardirqs_on(void);
55extern void trace_hardirqs_off(void);
56
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() \
62do { \
63 if (__this_cpu_inc_return(hardirq_context) == 1)\
64 current->hardirq_threaded = 0; \
65} while (0)
66# define lockdep_hardirq_threaded() \
67do { \
68 current->hardirq_threaded = 1; \
69} while (0)
70# define lockdep_hardirq_exit() \
71do { \
72 __this_cpu_dec(hardirq_context); \
73} while (0)
74# define lockdep_softirq_enter() \
75do { \
76 current->softirq_context++; \
77} while (0)
78# define lockdep_softirq_exit() \
79do { \
80 current->softirq_context--; \
81} while (0)
82
83# define lockdep_hrtimer_enter(__hrtimer) \
84({ \
85 bool __expires_hardirq = true; \
86 \
87 if (!__hrtimer->is_hard) { \
88 current->irq_config = 1; \
89 __expires_hardirq = false; \
90 } \
91 __expires_hardirq; \
92})
93
94# define lockdep_hrtimer_exit(__expires_hardirq) \
95 do { \
96 if (!__expires_hardirq) \
97 current->irq_config = 0; \
98 } while (0)
99
100# define lockdep_posixtimer_enter() \
101 do { \
102 current->irq_config = 1; \
103 } while (0)
104
105# define lockdep_posixtimer_exit() \
106 do { \
107 current->irq_config = 0; \
108 } while (0)
109
110# define lockdep_irq_work_enter(__work) \
111 do { \
112 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
113 current->irq_config = 1; \
114 } while (0)
115# define lockdep_irq_work_exit(__work) \
116 do { \
117 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
118 current->irq_config = 0; \
119 } while (0)
120
121#else
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)
141#endif
142
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);
147#else
148# define stop_critical_timings() do { } while (0)
149# define start_critical_timings() do { } while (0)
150#endif
151
152/*
153 * Wrap the arch provided IRQ routines to provide appropriate checks.
154 */
155#define raw_local_irq_disable() arch_local_irq_disable()
156#define raw_local_irq_enable() arch_local_irq_enable()
157#define raw_local_irq_save(flags) \
158 do { \
159 typecheck(unsigned long, flags); \
160 flags = arch_local_irq_save(); \
161 } while (0)
162#define raw_local_irq_restore(flags) \
163 do { \
164 typecheck(unsigned long, flags); \
165 arch_local_irq_restore(flags); \
166 } while (0)
167#define raw_local_save_flags(flags) \
168 do { \
169 typecheck(unsigned long, flags); \
170 flags = arch_local_save_flags(); \
171 } while (0)
172#define raw_irqs_disabled_flags(flags) \
173 ({ \
174 typecheck(unsigned long, flags); \
175 arch_irqs_disabled_flags(flags); \
176 })
177#define raw_irqs_disabled() (arch_irqs_disabled())
178#define raw_safe_halt() arch_safe_halt()
179
180/*
181 * The local_irq_*() APIs are equal to the raw_local_irq*()
182 * if !TRACE_IRQFLAGS.
183 */
184#ifdef CONFIG_TRACE_IRQFLAGS
185
186#define local_irq_enable() \
187 do { \
188 trace_hardirqs_on(); \
189 raw_local_irq_enable(); \
190 } while (0)
191
192#define local_irq_disable() \
193 do { \
194 bool was_disabled = raw_irqs_disabled();\
195 raw_local_irq_disable(); \
196 if (!was_disabled) \
197 trace_hardirqs_off(); \
198 } while (0)
199
200#define local_irq_save(flags) \
201 do { \
202 raw_local_irq_save(flags); \
203 if (!raw_irqs_disabled_flags(flags)) \
204 trace_hardirqs_off(); \
205 } while (0)
206
207#define local_irq_restore(flags) \
208 do { \
209 if (!raw_irqs_disabled_flags(flags)) \
210 trace_hardirqs_on(); \
211 raw_local_irq_restore(flags); \
212 } while (0)
213
214#define safe_halt() \
215 do { \
216 trace_hardirqs_on(); \
217 raw_safe_halt(); \
218 } while (0)
219
220
221#else /* !CONFIG_TRACE_IRQFLAGS */
222
223#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
224#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
225#define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
226#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
227#define safe_halt() do { raw_safe_halt(); } while (0)
228
229#endif /* CONFIG_TRACE_IRQFLAGS */
230
231#define local_save_flags(flags) raw_local_save_flags(flags)
232
233/*
234 * Some architectures don't define arch_irqs_disabled(), so even if either
235 * definition would be fine we need to use different ones for the time being
236 * to avoid build issues.
237 */
238#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
239#define irqs_disabled() \
240 ({ \
241 unsigned long _flags; \
242 raw_local_save_flags(_flags); \
243 raw_irqs_disabled_flags(_flags); \
244 })
245#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
246#define irqs_disabled() raw_irqs_disabled()
247#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
248
249#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
250
251#endif
1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * include/linux/irqflags.h
4 *
5 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
6 * provide callbacks for transitions between ON and OFF states.
7 *
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.
11 */
12#ifndef _LINUX_TRACE_IRQFLAGS_H
13#define _LINUX_TRACE_IRQFLAGS_H
14
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>
20
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);
28#else
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) { }
34#endif
35
36#ifdef CONFIG_TRACE_IRQFLAGS
37
38DECLARE_PER_CPU(int, hardirqs_enabled);
39DECLARE_PER_CPU(int, hardirq_context);
40
41extern void trace_hardirqs_on_prepare(void);
42extern void trace_hardirqs_off_finish(void);
43extern void trace_hardirqs_on(void);
44extern void trace_hardirqs_off(void);
45
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() \
51do { \
52 if (__this_cpu_inc_return(hardirq_context) == 1)\
53 current->hardirq_threaded = 0; \
54} while (0)
55# define lockdep_hardirq_threaded() \
56do { \
57 current->hardirq_threaded = 1; \
58} while (0)
59# define lockdep_hardirq_exit() \
60do { \
61 __this_cpu_dec(hardirq_context); \
62} while (0)
63
64# define lockdep_hrtimer_enter(__hrtimer) \
65({ \
66 bool __expires_hardirq = true; \
67 \
68 if (!__hrtimer->is_hard) { \
69 current->irq_config = 1; \
70 __expires_hardirq = false; \
71 } \
72 __expires_hardirq; \
73})
74
75# define lockdep_hrtimer_exit(__expires_hardirq) \
76 do { \
77 if (!__expires_hardirq) \
78 current->irq_config = 0; \
79 } while (0)
80
81# define lockdep_posixtimer_enter() \
82 do { \
83 current->irq_config = 1; \
84 } while (0)
85
86# define lockdep_posixtimer_exit() \
87 do { \
88 current->irq_config = 0; \
89 } while (0)
90
91# define lockdep_irq_work_enter(_flags) \
92 do { \
93 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
94 current->irq_config = 1; \
95 } while (0)
96# define lockdep_irq_work_exit(_flags) \
97 do { \
98 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
99 current->irq_config = 0; \
100 } while (0)
101
102#else
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)
122#endif
123
124#if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT)
125# define lockdep_softirq_enter() \
126do { \
127 current->softirq_context++; \
128} while (0)
129# define lockdep_softirq_exit() \
130do { \
131 current->softirq_context--; \
132} while (0)
133
134#else
135# define lockdep_softirq_enter() do { } while (0)
136# define lockdep_softirq_exit() do { } while (0)
137#endif
138
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);
143#else
144# define stop_critical_timings() do { } while (0)
145# define start_critical_timings() do { } while (0)
146#endif
147
148#ifdef CONFIG_DEBUG_IRQFLAGS
149extern void warn_bogus_irq_restore(void);
150#define raw_check_bogus_irq_restore() \
151 do { \
152 if (unlikely(!arch_irqs_disabled())) \
153 warn_bogus_irq_restore(); \
154 } while (0)
155#else
156#define raw_check_bogus_irq_restore() do { } while (0)
157#endif
158
159/*
160 * Wrap the arch provided IRQ routines to provide appropriate checks.
161 */
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) \
165 do { \
166 typecheck(unsigned long, flags); \
167 flags = arch_local_irq_save(); \
168 } while (0)
169#define raw_local_irq_restore(flags) \
170 do { \
171 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); \
173 arch_local_irq_restore(flags); \
174 } while (0)
175#define raw_local_save_flags(flags) \
176 do { \
177 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags(); \
179 } while (0)
180#define raw_irqs_disabled_flags(flags) \
181 ({ \
182 typecheck(unsigned long, flags); \
183 arch_irqs_disabled_flags(flags); \
184 })
185#define raw_irqs_disabled() (arch_irqs_disabled())
186#define raw_safe_halt() arch_safe_halt()
187
188/*
189 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS.
191 */
192#ifdef CONFIG_TRACE_IRQFLAGS
193
194#define local_irq_enable() \
195 do { \
196 trace_hardirqs_on(); \
197 raw_local_irq_enable(); \
198 } while (0)
199
200#define local_irq_disable() \
201 do { \
202 bool was_disabled = raw_irqs_disabled();\
203 raw_local_irq_disable(); \
204 if (!was_disabled) \
205 trace_hardirqs_off(); \
206 } while (0)
207
208#define local_irq_save(flags) \
209 do { \
210 raw_local_irq_save(flags); \
211 if (!raw_irqs_disabled_flags(flags)) \
212 trace_hardirqs_off(); \
213 } while (0)
214
215#define local_irq_restore(flags) \
216 do { \
217 if (!raw_irqs_disabled_flags(flags)) \
218 trace_hardirqs_on(); \
219 raw_local_irq_restore(flags); \
220 } while (0)
221
222#define safe_halt() \
223 do { \
224 trace_hardirqs_on(); \
225 raw_safe_halt(); \
226 } while (0)
227
228
229#else /* !CONFIG_TRACE_IRQFLAGS */
230
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)
236
237#endif /* CONFIG_TRACE_IRQFLAGS */
238
239#define local_save_flags(flags) raw_local_save_flags(flags)
240
241/*
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.
245 */
246#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247#define irqs_disabled() \
248 ({ \
249 unsigned long _flags; \
250 raw_local_save_flags(_flags); \
251 raw_irqs_disabled_flags(_flags); \
252 })
253#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254#define irqs_disabled() raw_irqs_disabled()
255#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
256
257#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
258
259DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), local_irq_enable())
260DEFINE_LOCK_GUARD_0(irqsave,
261 local_irq_save(_T->flags),
262 local_irq_restore(_T->flags),
263 unsigned long flags)
264
265#endif