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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/*
2 * include/linux/irqflags.h
3 *
4 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
5 * provide callbacks for transitions between ON and OFF states.
6 *
7 * This file gets included from lowlevel asm headers too, to provide
8 * wrapped versions of the local_irq_*() APIs, based on the
9 * raw_local_irq_*() macros from the lowlevel headers.
10 */
11#ifndef _LINUX_TRACE_IRQFLAGS_H
12#define _LINUX_TRACE_IRQFLAGS_H
13
14#include <linux/typecheck.h>
15#include <asm/irqflags.h>
16
17#ifdef CONFIG_TRACE_IRQFLAGS
18 extern void trace_softirqs_on(unsigned long ip);
19 extern void trace_softirqs_off(unsigned long ip);
20 extern void trace_hardirqs_on(void);
21 extern void trace_hardirqs_off(void);
22# define trace_hardirq_context(p) ((p)->hardirq_context)
23# define trace_softirq_context(p) ((p)->softirq_context)
24# define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
25# define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
26# define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
27# define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
28# define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
29# define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
30# define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
31#else
32# define trace_hardirqs_on() do { } while (0)
33# define trace_hardirqs_off() do { } while (0)
34# define trace_softirqs_on(ip) do { } while (0)
35# define trace_softirqs_off(ip) do { } while (0)
36# define trace_hardirq_context(p) 0
37# define trace_softirq_context(p) 0
38# define trace_hardirqs_enabled(p) 0
39# define trace_softirqs_enabled(p) 0
40# define trace_hardirq_enter() do { } while (0)
41# define trace_hardirq_exit() do { } while (0)
42# define lockdep_softirq_enter() do { } while (0)
43# define lockdep_softirq_exit() do { } while (0)
44# define INIT_TRACE_IRQFLAGS
45#endif
46
47#if defined(CONFIG_IRQSOFF_TRACER) || \
48 defined(CONFIG_PREEMPT_TRACER)
49 extern void stop_critical_timings(void);
50 extern void start_critical_timings(void);
51#else
52# define stop_critical_timings() do { } while (0)
53# define start_critical_timings() do { } while (0)
54#endif
55
56/*
57 * Wrap the arch provided IRQ routines to provide appropriate checks.
58 */
59#define raw_local_irq_disable() arch_local_irq_disable()
60#define raw_local_irq_enable() arch_local_irq_enable()
61#define raw_local_irq_save(flags) \
62 do { \
63 typecheck(unsigned long, flags); \
64 flags = arch_local_irq_save(); \
65 } while (0)
66#define raw_local_irq_restore(flags) \
67 do { \
68 typecheck(unsigned long, flags); \
69 arch_local_irq_restore(flags); \
70 } while (0)
71#define raw_local_save_flags(flags) \
72 do { \
73 typecheck(unsigned long, flags); \
74 flags = arch_local_save_flags(); \
75 } while (0)
76#define raw_irqs_disabled_flags(flags) \
77 ({ \
78 typecheck(unsigned long, flags); \
79 arch_irqs_disabled_flags(flags); \
80 })
81#define raw_irqs_disabled() (arch_irqs_disabled())
82#define raw_safe_halt() arch_safe_halt()
83
84/*
85 * The local_irq_*() APIs are equal to the raw_local_irq*()
86 * if !TRACE_IRQFLAGS.
87 */
88#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
89#define local_irq_enable() \
90 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
91#define local_irq_disable() \
92 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
93#define local_irq_save(flags) \
94 do { \
95 raw_local_irq_save(flags); \
96 trace_hardirqs_off(); \
97 } while (0)
98
99
100#define local_irq_restore(flags) \
101 do { \
102 if (raw_irqs_disabled_flags(flags)) { \
103 raw_local_irq_restore(flags); \
104 trace_hardirqs_off(); \
105 } else { \
106 trace_hardirqs_on(); \
107 raw_local_irq_restore(flags); \
108 } \
109 } while (0)
110#define local_save_flags(flags) \
111 do { \
112 raw_local_save_flags(flags); \
113 } while (0)
114
115#define irqs_disabled_flags(flags) \
116 ({ \
117 raw_irqs_disabled_flags(flags); \
118 })
119
120#define irqs_disabled() \
121 ({ \
122 unsigned long _flags; \
123 raw_local_save_flags(_flags); \
124 raw_irqs_disabled_flags(_flags); \
125 })
126
127#define safe_halt() \
128 do { \
129 trace_hardirqs_on(); \
130 raw_safe_halt(); \
131 } while (0)
132
133
134#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
135
136#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
137#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
138#define local_irq_save(flags) \
139 do { \
140 raw_local_irq_save(flags); \
141 } while (0)
142#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
143#define local_save_flags(flags) do { raw_local_save_flags(flags); } while (0)
144#define irqs_disabled() (raw_irqs_disabled())
145#define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags))
146#define safe_halt() do { raw_safe_halt(); } while (0)
147
148#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
149
150#endif