1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * include/linux/irqflags.h 3 * include/linux/irqflags.h
4 * 4 *
5 * IRQ flags tracing: follow the state of the 5 * IRQ flags tracing: follow the state of the hardirq and softirq flags and
6 * provide callbacks for transitions between O 6 * provide callbacks for transitions between ON and OFF states.
7 * 7 *
8 * This file gets included from lowlevel asm h 8 * This file gets included from lowlevel asm headers too, to provide
9 * wrapped versions of the local_irq_*() APIs, 9 * wrapped versions of the local_irq_*() APIs, based on the
10 * raw_local_irq_*() macros from the lowlevel 10 * raw_local_irq_*() macros from the lowlevel headers.
11 */ 11 */
12 #ifndef _LINUX_TRACE_IRQFLAGS_H 12 #ifndef _LINUX_TRACE_IRQFLAGS_H
13 #define _LINUX_TRACE_IRQFLAGS_H 13 #define _LINUX_TRACE_IRQFLAGS_H
14 14
15 #include <linux/irqflags_types.h> <<
16 #include <linux/typecheck.h> 15 #include <linux/typecheck.h>
17 #include <linux/cleanup.h> <<
18 #include <asm/irqflags.h> 16 #include <asm/irqflags.h>
19 #include <asm/percpu.h> <<
20 17
21 /* Currently lockdep_softirqs_on/off is used o 18 /* Currently lockdep_softirqs_on/off is used only by lockdep */
22 #ifdef CONFIG_PROVE_LOCKING 19 #ifdef CONFIG_PROVE_LOCKING
23 extern void lockdep_softirqs_on(unsigned lon 20 extern void lockdep_softirqs_on(unsigned long ip);
24 extern void lockdep_softirqs_off(unsigned lo 21 extern void lockdep_softirqs_off(unsigned long ip);
25 extern void lockdep_hardirqs_on_prepare(void <<
26 extern void lockdep_hardirqs_on(unsigned lon 22 extern void lockdep_hardirqs_on(unsigned long ip);
27 extern void lockdep_hardirqs_off(unsigned lo 23 extern void lockdep_hardirqs_off(unsigned long ip);
28 #else 24 #else
29 static inline void lockdep_softirqs_on(unsig 25 static inline void lockdep_softirqs_on(unsigned long ip) { }
30 static inline void lockdep_softirqs_off(unsi 26 static inline void lockdep_softirqs_off(unsigned long ip) { }
31 static inline void lockdep_hardirqs_on_prepa <<
32 static inline void lockdep_hardirqs_on(unsig 27 static inline void lockdep_hardirqs_on(unsigned long ip) { }
33 static inline void lockdep_hardirqs_off(unsi 28 static inline void lockdep_hardirqs_off(unsigned long ip) { }
34 #endif 29 #endif
35 30
36 #ifdef CONFIG_TRACE_IRQFLAGS 31 #ifdef CONFIG_TRACE_IRQFLAGS
37 !! 32 extern void trace_hardirqs_on(void);
38 DECLARE_PER_CPU(int, hardirqs_enabled); !! 33 extern void trace_hardirqs_off(void);
39 DECLARE_PER_CPU(int, hardirq_context); !! 34 # define lockdep_hardirq_context(p) ((p)->hardirq_context)
40 <<
41 extern void trace_hardirqs_on_prepare(void); <<
42 extern void trace_hardirqs_off_finish(void); <<
43 extern void trace_hardirqs_on(void); <<
44 extern void trace_hardirqs_off(void); <<
45 <<
46 # define lockdep_hardirq_context() (raw_c <<
47 # define lockdep_softirq_context(p) ((p)-> 35 # define lockdep_softirq_context(p) ((p)->softirq_context)
48 # define lockdep_hardirqs_enabled() (this_ !! 36 # define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled)
49 # define lockdep_softirqs_enabled(p) ((p)-> 37 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
50 # define lockdep_hardirq_enter() !! 38 # define lockdep_hardirq_enter() \
51 do { !! 39 do { \
52 if (__this_cpu_inc_return(hardirq_cont !! 40 if (!current->hardirq_context++) \
53 current->hardirq_threaded = 0; !! 41 current->hardirq_threaded = 0; \
54 } while (0) 42 } while (0)
55 # define lockdep_hardirq_threaded() 43 # define lockdep_hardirq_threaded() \
56 do { 44 do { \
57 current->hardirq_threaded = 1; 45 current->hardirq_threaded = 1; \
58 } while (0) 46 } while (0)
59 # define lockdep_hardirq_exit() 47 # define lockdep_hardirq_exit() \
60 do { 48 do { \
61 __this_cpu_dec(hardirq_context); !! 49 current->hardirq_context--; \
>> 50 } while (0)
>> 51 # define lockdep_softirq_enter() \
>> 52 do { \
>> 53 current->softirq_context++; \
>> 54 } while (0)
>> 55 # define lockdep_softirq_exit() \
>> 56 do { \
>> 57 current->softirq_context--; \
62 } while (0) 58 } while (0)
63 59
64 # define lockdep_hrtimer_enter(__hrtimer) 60 # define lockdep_hrtimer_enter(__hrtimer) \
65 ({ 61 ({ \
66 bool __expires_hardirq = true; 62 bool __expires_hardirq = true; \
67 63 \
68 if (!__hrtimer->is_hard) { 64 if (!__hrtimer->is_hard) { \
69 current->irq_config = 1; 65 current->irq_config = 1; \
70 __expires_hardirq = false; 66 __expires_hardirq = false; \
71 } 67 } \
72 __expires_hardirq; 68 __expires_hardirq; \
73 }) 69 })
74 70
75 # define lockdep_hrtimer_exit(__expires_hardir 71 # define lockdep_hrtimer_exit(__expires_hardirq) \
76 do { 72 do { \
77 if (!__expires_hardirq) 73 if (!__expires_hardirq) \
78 current->irq_config = 74 current->irq_config = 0; \
79 } while (0) 75 } while (0)
80 76
81 # define lockdep_posixtimer_enter() 77 # define lockdep_posixtimer_enter() \
82 do { 78 do { \
83 current->irq_config = 1; 79 current->irq_config = 1; \
84 } while (0) 80 } while (0)
85 81
86 # define lockdep_posixtimer_exit() 82 # define lockdep_posixtimer_exit() \
87 do { 83 do { \
88 current->irq_config = 0; 84 current->irq_config = 0; \
89 } while (0) 85 } while (0)
90 86
91 # define lockdep_irq_work_enter(_flags) !! 87 # define lockdep_irq_work_enter(__work) \
92 do { 88 do { \
93 if (!((_flags) & IRQ_WORK_HA !! 89 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
94 current->irq_config = 90 current->irq_config = 1; \
95 } while (0) 91 } while (0)
96 # define lockdep_irq_work_exit(_flags) !! 92 # define lockdep_irq_work_exit(__work) \
97 do { 93 do { \
98 if (!((_flags) & IRQ_WORK_HA !! 94 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\
99 current->irq_config = 95 current->irq_config = 0; \
100 } while (0) 96 } while (0)
101 97
102 #else 98 #else
103 # define trace_hardirqs_on_prepare() !! 99 # define trace_hardirqs_on() do { } while (0)
104 # define trace_hardirqs_off_finish() !! 100 # define trace_hardirqs_off() do { } while (0)
105 # define trace_hardirqs_on() !! 101 # define lockdep_hardirq_context(p) 0
106 # define trace_hardirqs_off() !! 102 # define lockdep_softirq_context(p) 0
107 # define lockdep_hardirq_context() !! 103 # define lockdep_hardirqs_enabled(p) 0
108 # define lockdep_softirq_context(p) !! 104 # define lockdep_softirqs_enabled(p) 0
109 # define lockdep_hardirqs_enabled() !! 105 # define lockdep_hardirq_enter() do { } while (0)
110 # define lockdep_softirqs_enabled(p) !! 106 # define lockdep_hardirq_threaded() do { } while (0)
111 # define lockdep_hardirq_enter() !! 107 # define lockdep_hardirq_exit() do { } while (0)
112 # define lockdep_hardirq_threaded() !! 108 # define lockdep_softirq_enter() do { } while (0)
113 # define lockdep_hardirq_exit() !! 109 # define lockdep_softirq_exit() do { } while (0)
114 # define lockdep_softirq_enter() <<
115 # define lockdep_softirq_exit() <<
116 # define lockdep_hrtimer_enter(__hrtimer) 110 # define lockdep_hrtimer_enter(__hrtimer) false
117 # define lockdep_hrtimer_exit(__context) !! 111 # define lockdep_hrtimer_exit(__context) do { } while (0)
118 # define lockdep_posixtimer_enter() 112 # define lockdep_posixtimer_enter() do { } while (0)
119 # define lockdep_posixtimer_exit() 113 # define lockdep_posixtimer_exit() do { } while (0)
120 # define lockdep_irq_work_enter(__work) 114 # define lockdep_irq_work_enter(__work) do { } while (0)
121 # define lockdep_irq_work_exit(__work) 115 # define lockdep_irq_work_exit(__work) do { } while (0)
122 #endif 116 #endif
123 117
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 <<
135 # define lockdep_softirq_enter() <<
136 # define lockdep_softirq_exit() <<
137 #endif <<
138 <<
139 #if defined(CONFIG_IRQSOFF_TRACER) || \ 118 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER) 119 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void); 120 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void); 121 extern void start_critical_timings(void);
143 #else 122 #else
144 # define stop_critical_timings() do { } while 123 # define stop_critical_timings() do { } while (0)
145 # define start_critical_timings() do { } while 124 # define start_critical_timings() do { } while (0)
146 #endif 125 #endif
147 126
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 /* 127 /*
160 * Wrap the arch provided IRQ routines to prov 128 * Wrap the arch provided IRQ routines to provide appropriate checks.
161 */ 129 */
162 #define raw_local_irq_disable() arch_l 130 #define raw_local_irq_disable() arch_local_irq_disable()
163 #define raw_local_irq_enable() arch_l 131 #define raw_local_irq_enable() arch_local_irq_enable()
164 #define raw_local_irq_save(flags) 132 #define raw_local_irq_save(flags) \
165 do { 133 do { \
166 typecheck(unsigned long, flags 134 typecheck(unsigned long, flags); \
167 flags = arch_local_irq_save(); 135 flags = arch_local_irq_save(); \
168 } while (0) 136 } while (0)
169 #define raw_local_irq_restore(flags) 137 #define raw_local_irq_restore(flags) \
170 do { 138 do { \
171 typecheck(unsigned long, flags 139 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); <<
173 arch_local_irq_restore(flags); 140 arch_local_irq_restore(flags); \
174 } while (0) 141 } while (0)
175 #define raw_local_save_flags(flags) 142 #define raw_local_save_flags(flags) \
176 do { 143 do { \
177 typecheck(unsigned long, flags 144 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags( 145 flags = arch_local_save_flags(); \
179 } while (0) 146 } while (0)
180 #define raw_irqs_disabled_flags(flags) 147 #define raw_irqs_disabled_flags(flags) \
181 ({ 148 ({ \
182 typecheck(unsigned long, flags 149 typecheck(unsigned long, flags); \
183 arch_irqs_disabled_flags(flags 150 arch_irqs_disabled_flags(flags); \
184 }) 151 })
185 #define raw_irqs_disabled() (arch_ 152 #define raw_irqs_disabled() (arch_irqs_disabled())
186 #define raw_safe_halt() arch_s 153 #define raw_safe_halt() arch_safe_halt()
187 154
188 /* 155 /*
189 * The local_irq_*() APIs are equal to the raw 156 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS. 157 * if !TRACE_IRQFLAGS.
191 */ 158 */
192 #ifdef CONFIG_TRACE_IRQFLAGS 159 #ifdef CONFIG_TRACE_IRQFLAGS
193 !! 160 #define local_irq_enable() \
194 #define local_irq_enable() !! 161 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
195 do { !! 162 #define local_irq_disable() \
196 trace_hardirqs_on(); !! 163 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) 164 #define local_irq_save(flags) \
209 do { 165 do { \
210 raw_local_irq_save(flags); 166 raw_local_irq_save(flags); \
211 if (!raw_irqs_disabled_flags(f !! 167 trace_hardirqs_off(); \
212 trace_hardirqs_off(); <<
213 } while (0) 168 } while (0)
214 169
>> 170
215 #define local_irq_restore(flags) 171 #define local_irq_restore(flags) \
216 do { 172 do { \
217 if (!raw_irqs_disabled_flags(f !! 173 if (raw_irqs_disabled_flags(flags)) { \
>> 174 raw_local_irq_restore(flags); \
>> 175 trace_hardirqs_off(); \
>> 176 } else { \
218 trace_hardirqs_on(); 177 trace_hardirqs_on(); \
219 raw_local_irq_restore(flags); !! 178 raw_local_irq_restore(flags); \
>> 179 } \
220 } while (0) 180 } while (0)
221 181
222 #define safe_halt() 182 #define safe_halt() \
223 do { 183 do { \
224 trace_hardirqs_on(); 184 trace_hardirqs_on(); \
225 raw_safe_halt(); 185 raw_safe_halt(); \
226 } while (0) 186 } while (0)
227 187
228 188
229 #else /* !CONFIG_TRACE_IRQFLAGS */ 189 #else /* !CONFIG_TRACE_IRQFLAGS */
230 190
231 #define local_irq_enable() do { raw_local 191 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
232 #define local_irq_disable() do { raw_local 192 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
233 #define local_irq_save(flags) do { raw_local !! 193 #define local_irq_save(flags) \
>> 194 do { \
>> 195 raw_local_irq_save(flags); \
>> 196 } while (0)
234 #define local_irq_restore(flags) do { raw_loca 197 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
235 #define safe_halt() do { raw_safe_ 198 #define safe_halt() do { raw_safe_halt(); } while (0)
236 199
237 #endif /* CONFIG_TRACE_IRQFLAGS */ 200 #endif /* CONFIG_TRACE_IRQFLAGS */
238 201
239 #define local_save_flags(flags) raw_local_save 202 #define local_save_flags(flags) raw_local_save_flags(flags)
240 203
241 /* 204 /*
242 * Some architectures don't define arch_irqs_d 205 * Some architectures don't define arch_irqs_disabled(), so even if either
243 * definition would be fine we need to use dif 206 * definition would be fine we need to use different ones for the time being
244 * to avoid build issues. 207 * to avoid build issues.
245 */ 208 */
246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 209 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247 #define irqs_disabled() 210 #define irqs_disabled() \
248 ({ 211 ({ \
249 unsigned long _flags; 212 unsigned long _flags; \
250 raw_local_save_flags(_flags); 213 raw_local_save_flags(_flags); \
251 raw_irqs_disabled_flags(_flags 214 raw_irqs_disabled_flags(_flags); \
252 }) 215 })
253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 216 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254 #define irqs_disabled() raw_irqs_disabled() 217 #define irqs_disabled() raw_irqs_disabled()
255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 218 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
256 219
257 #define irqs_disabled_flags(flags) raw_irqs_di 220 #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) <<
264 221
265 #endif 222 #endif
266 223
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