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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(_flags) \
111 do { \
112 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
113 current->irq_config = 1; \
114 } while (0)
115# define lockdep_irq_work_exit(_flags) \
116 do { \
117 if (!((_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#ifdef CONFIG_DEBUG_IRQFLAGS
153extern void warn_bogus_irq_restore(void);
154#define raw_check_bogus_irq_restore() \
155 do { \
156 if (unlikely(!arch_irqs_disabled())) \
157 warn_bogus_irq_restore(); \
158 } while (0)
159#else
160#define raw_check_bogus_irq_restore() do { } while (0)
161#endif
162
163/*
164 * Wrap the arch provided IRQ routines to provide appropriate checks.
165 */
166#define raw_local_irq_disable() arch_local_irq_disable()
167#define raw_local_irq_enable() arch_local_irq_enable()
168#define raw_local_irq_save(flags) \
169 do { \
170 typecheck(unsigned long, flags); \
171 flags = arch_local_irq_save(); \
172 } while (0)
173#define raw_local_irq_restore(flags) \
174 do { \
175 typecheck(unsigned long, flags); \
176 raw_check_bogus_irq_restore(); \
177 arch_local_irq_restore(flags); \
178 } while (0)
179#define raw_local_save_flags(flags) \
180 do { \
181 typecheck(unsigned long, flags); \
182 flags = arch_local_save_flags(); \
183 } while (0)
184#define raw_irqs_disabled_flags(flags) \
185 ({ \
186 typecheck(unsigned long, flags); \
187 arch_irqs_disabled_flags(flags); \
188 })
189#define raw_irqs_disabled() (arch_irqs_disabled())
190#define raw_safe_halt() arch_safe_halt()
191
192/*
193 * The local_irq_*() APIs are equal to the raw_local_irq*()
194 * if !TRACE_IRQFLAGS.
195 */
196#ifdef CONFIG_TRACE_IRQFLAGS
197
198#define local_irq_enable() \
199 do { \
200 trace_hardirqs_on(); \
201 raw_local_irq_enable(); \
202 } while (0)
203
204#define local_irq_disable() \
205 do { \
206 bool was_disabled = raw_irqs_disabled();\
207 raw_local_irq_disable(); \
208 if (!was_disabled) \
209 trace_hardirqs_off(); \
210 } while (0)
211
212#define local_irq_save(flags) \
213 do { \
214 raw_local_irq_save(flags); \
215 if (!raw_irqs_disabled_flags(flags)) \
216 trace_hardirqs_off(); \
217 } while (0)
218
219#define local_irq_restore(flags) \
220 do { \
221 if (!raw_irqs_disabled_flags(flags)) \
222 trace_hardirqs_on(); \
223 raw_local_irq_restore(flags); \
224 } while (0)
225
226#define safe_halt() \
227 do { \
228 trace_hardirqs_on(); \
229 raw_safe_halt(); \
230 } while (0)
231
232
233#else /* !CONFIG_TRACE_IRQFLAGS */
234
235#define local_irq_enable() do { raw_local_irq_enable(); } while (0)
236#define local_irq_disable() do { raw_local_irq_disable(); } while (0)
237#define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
238#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
239#define safe_halt() do { raw_safe_halt(); } while (0)
240
241#endif /* CONFIG_TRACE_IRQFLAGS */
242
243#define local_save_flags(flags) raw_local_save_flags(flags)
244
245/*
246 * Some architectures don't define arch_irqs_disabled(), so even if either
247 * definition would be fine we need to use different ones for the time being
248 * to avoid build issues.
249 */
250#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
251#define irqs_disabled() \
252 ({ \
253 unsigned long _flags; \
254 raw_local_save_flags(_flags); \
255 raw_irqs_disabled_flags(_flags); \
256 })
257#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
258#define irqs_disabled() raw_irqs_disabled()
259#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
260
261#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
262
263#endif