1 /* SPDX-License-Identifier: GPL-2.0 */ <<
2 /* 1 /*
3 * include/linux/irqflags.h 2 * include/linux/irqflags.h
4 * 3 *
5 * IRQ flags tracing: follow the state of the 4 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
6 * provide callbacks for transitions between O 5 * provide callbacks for transitions between ON and OFF states.
7 * 6 *
8 * This file gets included from lowlevel asm h 7 * This file gets included from lowlevel asm headers too, to provide
9 * wrapped versions of the local_irq_*() APIs, 8 * wrapped versions of the local_irq_*() APIs, based on the
10 * raw_local_irq_*() macros from the lowlevel 9 * raw_local_irq_*() macros from the lowlevel headers.
11 */ 10 */
12 #ifndef _LINUX_TRACE_IRQFLAGS_H 11 #ifndef _LINUX_TRACE_IRQFLAGS_H
13 #define _LINUX_TRACE_IRQFLAGS_H 12 #define _LINUX_TRACE_IRQFLAGS_H
14 13
15 #include <linux/irqflags_types.h> <<
16 #include <linux/typecheck.h> 14 #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 o <<
22 #ifdef CONFIG_PROVE_LOCKING <<
23 extern void lockdep_softirqs_on(unsigned lon <<
24 extern void lockdep_softirqs_off(unsigned lo <<
25 extern void lockdep_hardirqs_on_prepare(void <<
26 extern void lockdep_hardirqs_on(unsigned lon <<
27 extern void lockdep_hardirqs_off(unsigned lo <<
28 #else <<
29 static inline void lockdep_softirqs_on(unsig <<
30 static inline void lockdep_softirqs_off(unsi <<
31 static inline void lockdep_hardirqs_on_prepa <<
32 static inline void lockdep_hardirqs_on(unsig <<
33 static inline void lockdep_hardirqs_off(unsi <<
34 #endif <<
35 15
36 #ifdef CONFIG_TRACE_IRQFLAGS 16 #ifdef CONFIG_TRACE_IRQFLAGS
37 !! 17 extern void trace_softirqs_on(unsigned long ip);
38 DECLARE_PER_CPU(int, hardirqs_enabled); !! 18 extern void trace_softirqs_off(unsigned long ip);
39 DECLARE_PER_CPU(int, hardirq_context); !! 19 extern void trace_hardirqs_on(void);
40 !! 20 extern void trace_hardirqs_off(void);
41 extern void trace_hardirqs_on_prepare(void); !! 21 # define trace_hardirq_context(p) ((p)->hardirq_context)
42 extern void trace_hardirqs_off_finish(void); !! 22 # define trace_softirq_context(p) ((p)->softirq_context)
43 extern void trace_hardirqs_on(void); !! 23 # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
44 extern void trace_hardirqs_off(void); !! 24 # define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
45 !! 25 # define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
46 # define lockdep_hardirq_context() (raw_c !! 26 # define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
47 # define lockdep_softirq_context(p) ((p)-> !! 27 # define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
48 # define lockdep_hardirqs_enabled() (this_ !! 28 # define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
49 # define lockdep_softirqs_enabled(p) ((p)-> !! 29 # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
50 # define lockdep_hardirq_enter() <<
51 do { <<
52 if (__this_cpu_inc_return(hardirq_cont <<
53 current->hardirq_threaded = 0; <<
54 } while (0) <<
55 # define lockdep_hardirq_threaded() <<
56 do { <<
57 current->hardirq_threaded = 1; <<
58 } while (0) <<
59 # define lockdep_hardirq_exit() <<
60 do { <<
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_hardir <<
76 do { <<
77 if (!__expires_hardirq) <<
78 current->irq_config = <<
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_HA <<
94 current->irq_config = <<
95 } while (0) <<
96 # define lockdep_irq_work_exit(_flags) <<
97 do { <<
98 if (!((_flags) & IRQ_WORK_HA <<
99 current->irq_config = <<
100 } while (0) <<
101 <<
102 #else <<
103 # define trace_hardirqs_on_prepare() <<
104 # define trace_hardirqs_off_finish() <<
105 # define trace_hardirqs_on() <<
106 # define trace_hardirqs_off() <<
107 # define lockdep_hardirq_context() <<
108 # define lockdep_softirq_context(p) <<
109 # define lockdep_hardirqs_enabled() <<
110 # define lockdep_softirqs_enabled(p) <<
111 # define lockdep_hardirq_enter() <<
112 # define lockdep_hardirq_threaded() <<
113 # define lockdep_hardirq_exit() <<
114 # define lockdep_softirq_enter() <<
115 # define lockdep_softirq_exit() <<
116 # define lockdep_hrtimer_enter(__hrtimer) <<
117 # define lockdep_hrtimer_exit(__context) <<
118 # define lockdep_posixtimer_enter() <<
119 # define lockdep_posixtimer_exit() <<
120 # define lockdep_irq_work_enter(__work) <<
121 # define lockdep_irq_work_exit(__work) <<
122 #endif <<
123 <<
124 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined <<
125 # define lockdep_softirq_enter() <<
126 do { <<
127 current->softirq_context++; <<
128 } while (0) <<
129 # define lockdep_softirq_exit() <<
130 do { <<
131 current->softirq_context--; <<
132 } while (0) <<
133 <<
134 #else 30 #else
135 # define lockdep_softirq_enter() !! 31 # define trace_hardirqs_on() do { } while (0)
136 # define lockdep_softirq_exit() !! 32 # define trace_hardirqs_off() do { } while (0)
>> 33 # define trace_softirqs_on(ip) do { } while (0)
>> 34 # define trace_softirqs_off(ip) do { } while (0)
>> 35 # define trace_hardirq_context(p) 0
>> 36 # define trace_softirq_context(p) 0
>> 37 # define trace_hardirqs_enabled(p) 0
>> 38 # define trace_softirqs_enabled(p) 0
>> 39 # define trace_hardirq_enter() do { } while (0)
>> 40 # define trace_hardirq_exit() do { } while (0)
>> 41 # define lockdep_softirq_enter() do { } while (0)
>> 42 # define lockdep_softirq_exit() do { } while (0)
>> 43 # define INIT_TRACE_IRQFLAGS
137 #endif 44 #endif
138 45
139 #if defined(CONFIG_IRQSOFF_TRACER) || \ 46 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER) 47 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void); 48 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void); 49 extern void start_critical_timings(void);
143 #else 50 #else
144 # define stop_critical_timings() do { } while 51 # define stop_critical_timings() do { } while (0)
145 # define start_critical_timings() do { } while 52 # define start_critical_timings() do { } while (0)
146 #endif 53 #endif
147 54
148 #ifdef CONFIG_DEBUG_IRQFLAGS !! 55 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
149 extern void warn_bogus_irq_restore(void); <<
150 #define raw_check_bogus_irq_restore() <<
151 do { <<
152 if (unlikely(!arch_irqs_disabl <<
153 warn_bogus_irq_restore <<
154 } while (0) <<
155 #else <<
156 #define raw_check_bogus_irq_restore() do { } w <<
157 #endif <<
158 56
159 /* !! 57 #include <asm/irqflags.h>
160 * Wrap the arch provided IRQ routines to prov !! 58
161 */ !! 59 #define local_irq_enable() \
162 #define raw_local_irq_disable() arch_l !! 60 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
163 #define raw_local_irq_enable() arch_l !! 61 #define local_irq_disable() \
164 #define raw_local_irq_save(flags) !! 62 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
165 do { !! 63 #define local_irq_save(flags) \
166 typecheck(unsigned long, flags <<
167 flags = arch_local_irq_save(); <<
168 } while (0) <<
169 #define raw_local_irq_restore(flags) <<
170 do { 64 do { \
171 typecheck(unsigned long, flags 65 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); !! 66 raw_local_irq_save(flags); \
173 arch_local_irq_restore(flags); !! 67 trace_hardirqs_off(); \
174 } while (0) 68 } while (0)
175 #define raw_local_save_flags(flags) !! 69
>> 70
>> 71 #define local_irq_restore(flags) \
176 do { 72 do { \
177 typecheck(unsigned long, flags 73 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags( !! 74 if (raw_irqs_disabled_flags(flags)) { \
>> 75 raw_local_irq_restore(flags); \
>> 76 trace_hardirqs_off(); \
>> 77 } else { \
>> 78 trace_hardirqs_on(); \
>> 79 raw_local_irq_restore(flags); \
>> 80 } \
179 } while (0) 81 } while (0)
180 #define raw_irqs_disabled_flags(flags) !! 82 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
181 ({ <<
182 typecheck(unsigned long, flags <<
183 arch_irqs_disabled_flags(flags <<
184 }) <<
185 #define raw_irqs_disabled() (arch_ <<
186 #define raw_safe_halt() arch_s <<
187 <<
188 /* 83 /*
189 * The local_irq_*() APIs are equal to the raw 84 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS. 85 * if !TRACE_IRQFLAGS.
191 */ 86 */
192 #ifdef CONFIG_TRACE_IRQFLAGS !! 87 # define raw_local_irq_disable() local_irq_disable()
193 !! 88 # define raw_local_irq_enable() local_irq_enable()
194 #define local_irq_enable() !! 89 # define raw_local_irq_save(flags) \
195 do { 90 do { \
196 trace_hardirqs_on(); !! 91 typecheck(unsigned long, flags); \
197 raw_local_irq_enable(); !! 92 local_irq_save(flags); \
198 } while (0) 93 } while (0)
199 !! 94 # define raw_local_irq_restore(flags) \
200 #define local_irq_disable() <<
201 do { 95 do { \
202 bool was_disabled = raw_irqs_d !! 96 typecheck(unsigned long, flags); \
203 raw_local_irq_disable(); !! 97 local_irq_restore(flags); \
204 if (!was_disabled) <<
205 trace_hardirqs_off(); <<
206 } while (0) 98 } while (0)
>> 99 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
207 100
208 #define local_irq_save(flags) !! 101 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
209 do { !! 102 #define safe_halt() \
210 raw_local_irq_save(flags); !! 103 do { \
211 if (!raw_irqs_disabled_flags(f !! 104 trace_hardirqs_on(); \
212 trace_hardirqs_off(); !! 105 raw_safe_halt(); \
213 } while (0) 106 } while (0)
214 107
215 #define local_irq_restore(flags) !! 108 #define local_save_flags(flags) \
216 do { 109 do { \
217 if (!raw_irqs_disabled_flags(f !! 110 typecheck(unsigned long, flags); \
218 trace_hardirqs_on(); !! 111 raw_local_save_flags(flags); \
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) 112 } while (0)
227 113
>> 114 #define irqs_disabled() \
>> 115 ({ \
>> 116 unsigned long _flags; \
>> 117 \
>> 118 raw_local_save_flags(_flags); \
>> 119 raw_irqs_disabled_flags(_flags); \
>> 120 })
228 121
229 #else /* !CONFIG_TRACE_IRQFLAGS */ !! 122 #define irqs_disabled_flags(flags) \
230 !! 123 ({ \
231 #define local_irq_enable() do { raw_local !! 124 typecheck(unsigned long, flags); \
232 #define local_irq_disable() do { raw_local !! 125 raw_irqs_disabled_flags(flags); \
233 #define local_irq_save(flags) do { raw_local !! 126 })
234 #define local_irq_restore(flags) do { raw_loca !! 127 #endif /* CONFIG_X86 */
235 #define safe_halt() do { raw_safe_ <<
236 <<
237 #endif /* CONFIG_TRACE_IRQFLAGS */ <<
238 <<
239 #define local_save_flags(flags) raw_local_save <<
240 <<
241 /* <<
242 * Some architectures don't define arch_irqs_d <<
243 * definition would be fine we need to use dif <<
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_di <<
258 <<
259 DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), <<
260 DEFINE_LOCK_GUARD_0(irqsave, <<
261 local_irq_save(_T->flags), <<
262 local_irq_restore(_T->flag <<
263 unsigned long flags) <<
264 128
265 #endif 129 #endif
266 130
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