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> 15 #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 16
36 #ifdef CONFIG_TRACE_IRQFLAGS 17 #ifdef CONFIG_TRACE_IRQFLAGS
37 !! 18 extern void trace_softirqs_on(unsigned long ip);
38 DECLARE_PER_CPU(int, hardirqs_enabled); !! 19 extern void trace_softirqs_off(unsigned long ip);
39 DECLARE_PER_CPU(int, hardirq_context); !! 20 extern void trace_hardirqs_on(void);
40 !! 21 extern void trace_hardirqs_off(void);
41 extern void trace_hardirqs_on_prepare(void); !! 22 # define trace_hardirq_context(p) ((p)->hardirq_context)
42 extern void trace_hardirqs_off_finish(void); !! 23 # define trace_softirq_context(p) ((p)->softirq_context)
43 extern void trace_hardirqs_on(void); !! 24 # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
44 extern void trace_hardirqs_off(void); !! 25 # define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
45 !! 26 # define trace_hardirq_enter() do { current->hardirq_context++; } while (0)
46 # define lockdep_hardirq_context() (raw_c !! 27 # define trace_hardirq_exit() do { current->hardirq_context--; } while (0)
47 # define lockdep_softirq_context(p) ((p)-> !! 28 # define lockdep_softirq_enter() do { current->softirq_context++; } while (0)
48 # define lockdep_hardirqs_enabled() (this_ !! 29 # define lockdep_softirq_exit() do { current->softirq_context--; } while (0)
49 # define lockdep_softirqs_enabled(p) ((p)-> !! 30 # 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 31 #else
135 # define lockdep_softirq_enter() !! 32 # define trace_hardirqs_on() do { } while (0)
136 # define lockdep_softirq_exit() !! 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
137 #endif 45 #endif
138 46
139 #if defined(CONFIG_IRQSOFF_TRACER) || \ 47 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER) 48 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void); 49 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void); 50 extern void start_critical_timings(void);
143 #else 51 #else
144 # define stop_critical_timings() do { } while 52 # define stop_critical_timings() do { } while (0)
145 # define start_critical_timings() do { } while 53 # define start_critical_timings() do { } while (0)
146 #endif 54 #endif
147 55
148 #ifdef CONFIG_DEBUG_IRQFLAGS <<
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 <<
159 /* 56 /*
160 * Wrap the arch provided IRQ routines to prov 57 * Wrap the arch provided IRQ routines to provide appropriate checks.
161 */ 58 */
162 #define raw_local_irq_disable() arch_l 59 #define raw_local_irq_disable() arch_local_irq_disable()
163 #define raw_local_irq_enable() arch_l 60 #define raw_local_irq_enable() arch_local_irq_enable()
164 #define raw_local_irq_save(flags) 61 #define raw_local_irq_save(flags) \
165 do { 62 do { \
166 typecheck(unsigned long, flags 63 typecheck(unsigned long, flags); \
167 flags = arch_local_irq_save(); 64 flags = arch_local_irq_save(); \
168 } while (0) 65 } while (0)
169 #define raw_local_irq_restore(flags) 66 #define raw_local_irq_restore(flags) \
170 do { 67 do { \
171 typecheck(unsigned long, flags 68 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); <<
173 arch_local_irq_restore(flags); 69 arch_local_irq_restore(flags); \
174 } while (0) 70 } while (0)
175 #define raw_local_save_flags(flags) 71 #define raw_local_save_flags(flags) \
176 do { 72 do { \
177 typecheck(unsigned long, flags 73 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags( 74 flags = arch_local_save_flags(); \
179 } while (0) 75 } while (0)
180 #define raw_irqs_disabled_flags(flags) 76 #define raw_irqs_disabled_flags(flags) \
181 ({ 77 ({ \
182 typecheck(unsigned long, flags 78 typecheck(unsigned long, flags); \
183 arch_irqs_disabled_flags(flags 79 arch_irqs_disabled_flags(flags); \
184 }) 80 })
185 #define raw_irqs_disabled() (arch_ 81 #define raw_irqs_disabled() (arch_irqs_disabled())
186 #define raw_safe_halt() arch_s 82 #define raw_safe_halt() arch_safe_halt()
187 83
188 /* 84 /*
189 * The local_irq_*() APIs are equal to the raw 85 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS. 86 * if !TRACE_IRQFLAGS.
191 */ 87 */
192 #ifdef CONFIG_TRACE_IRQFLAGS 88 #ifdef CONFIG_TRACE_IRQFLAGS
193 !! 89 #define local_irq_enable() \
194 #define local_irq_enable() !! 90 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
195 do { !! 91 #define local_irq_disable() \
196 trace_hardirqs_on(); !! 92 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0)
197 raw_local_irq_enable(); <<
198 } while (0) <<
199 <<
200 #define local_irq_disable() <<
201 do { <<
202 bool was_disabled = raw_irqs_d <<
203 raw_local_irq_disable(); <<
204 if (!was_disabled) <<
205 trace_hardirqs_off(); <<
206 } while (0) <<
207 <<
208 #define local_irq_save(flags) 93 #define local_irq_save(flags) \
209 do { 94 do { \
210 raw_local_irq_save(flags); 95 raw_local_irq_save(flags); \
211 if (!raw_irqs_disabled_flags(f !! 96 trace_hardirqs_off(); \
212 trace_hardirqs_off(); <<
213 } while (0) 97 } while (0)
214 98
>> 99
215 #define local_irq_restore(flags) 100 #define local_irq_restore(flags) \
216 do { 101 do { \
217 if (!raw_irqs_disabled_flags(f !! 102 if (raw_irqs_disabled_flags(flags)) { \
>> 103 raw_local_irq_restore(flags); \
>> 104 trace_hardirqs_off(); \
>> 105 } else { \
218 trace_hardirqs_on(); 106 trace_hardirqs_on(); \
219 raw_local_irq_restore(flags); !! 107 raw_local_irq_restore(flags); \
>> 108 } \
220 } while (0) 109 } while (0)
221 110
222 #define safe_halt() 111 #define safe_halt() \
223 do { 112 do { \
224 trace_hardirqs_on(); 113 trace_hardirqs_on(); \
225 raw_safe_halt(); 114 raw_safe_halt(); \
226 } while (0) 115 } while (0)
227 116
228 117
229 #else /* !CONFIG_TRACE_IRQFLAGS */ 118 #else /* !CONFIG_TRACE_IRQFLAGS */
230 119
231 #define local_irq_enable() do { raw_local 120 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
232 #define local_irq_disable() do { raw_local 121 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
233 #define local_irq_save(flags) do { raw_local !! 122 #define local_irq_save(flags) \
>> 123 do { \
>> 124 raw_local_irq_save(flags); \
>> 125 } while (0)
234 #define local_irq_restore(flags) do { raw_loca 126 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
235 #define safe_halt() do { raw_safe_ 127 #define safe_halt() do { raw_safe_halt(); } while (0)
236 128
237 #endif /* CONFIG_TRACE_IRQFLAGS */ 129 #endif /* CONFIG_TRACE_IRQFLAGS */
238 130
239 #define local_save_flags(flags) raw_local_save 131 #define local_save_flags(flags) raw_local_save_flags(flags)
240 132
241 /* 133 /*
242 * Some architectures don't define arch_irqs_d 134 * Some architectures don't define arch_irqs_disabled(), so even if either
243 * definition would be fine we need to use dif 135 * definition would be fine we need to use different ones for the time being
244 * to avoid build issues. 136 * to avoid build issues.
245 */ 137 */
246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 138 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247 #define irqs_disabled() 139 #define irqs_disabled() \
248 ({ 140 ({ \
249 unsigned long _flags; 141 unsigned long _flags; \
250 raw_local_save_flags(_flags); 142 raw_local_save_flags(_flags); \
251 raw_irqs_disabled_flags(_flags 143 raw_irqs_disabled_flags(_flags); \
252 }) 144 })
253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 145 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254 #define irqs_disabled() raw_irqs_disabled() 146 #define irqs_disabled() raw_irqs_disabled()
255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 147 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
256 148
257 #define irqs_disabled_flags(flags) raw_irqs_di 149 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
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) <<
264 150
265 #endif 151 #endif
266 152
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