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> 15 #include <linux/irqflags_types.h>
16 #include <linux/typecheck.h> 16 #include <linux/typecheck.h>
17 #include <linux/cleanup.h> 17 #include <linux/cleanup.h>
18 #include <asm/irqflags.h> 18 #include <asm/irqflags.h>
19 #include <asm/percpu.h> 19 #include <asm/percpu.h>
20 20
21 /* Currently lockdep_softirqs_on/off is used o 21 /* Currently lockdep_softirqs_on/off is used only by lockdep */
22 #ifdef CONFIG_PROVE_LOCKING 22 #ifdef CONFIG_PROVE_LOCKING
23 extern void lockdep_softirqs_on(unsigned lon 23 extern void lockdep_softirqs_on(unsigned long ip);
24 extern void lockdep_softirqs_off(unsigned lo 24 extern void lockdep_softirqs_off(unsigned long ip);
25 extern void lockdep_hardirqs_on_prepare(void 25 extern void lockdep_hardirqs_on_prepare(void);
26 extern void lockdep_hardirqs_on(unsigned lon 26 extern void lockdep_hardirqs_on(unsigned long ip);
27 extern void lockdep_hardirqs_off(unsigned lo 27 extern void lockdep_hardirqs_off(unsigned long ip);
28 #else 28 #else
29 static inline void lockdep_softirqs_on(unsig 29 static inline void lockdep_softirqs_on(unsigned long ip) { }
30 static inline void lockdep_softirqs_off(unsi 30 static inline void lockdep_softirqs_off(unsigned long ip) { }
31 static inline void lockdep_hardirqs_on_prepa 31 static inline void lockdep_hardirqs_on_prepare(void) { }
32 static inline void lockdep_hardirqs_on(unsig 32 static inline void lockdep_hardirqs_on(unsigned long ip) { }
33 static inline void lockdep_hardirqs_off(unsi 33 static inline void lockdep_hardirqs_off(unsigned long ip) { }
34 #endif 34 #endif
35 35
36 #ifdef CONFIG_TRACE_IRQFLAGS 36 #ifdef CONFIG_TRACE_IRQFLAGS
37 37
38 DECLARE_PER_CPU(int, hardirqs_enabled); 38 DECLARE_PER_CPU(int, hardirqs_enabled);
39 DECLARE_PER_CPU(int, hardirq_context); 39 DECLARE_PER_CPU(int, hardirq_context);
40 40
41 extern void trace_hardirqs_on_prepare(void); 41 extern void trace_hardirqs_on_prepare(void);
42 extern void trace_hardirqs_off_finish(void); 42 extern void trace_hardirqs_off_finish(void);
43 extern void trace_hardirqs_on(void); 43 extern void trace_hardirqs_on(void);
44 extern void trace_hardirqs_off(void); 44 extern void trace_hardirqs_off(void);
45 45
46 # define lockdep_hardirq_context() (raw_c 46 # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context))
47 # define lockdep_softirq_context(p) ((p)-> 47 # define lockdep_softirq_context(p) ((p)->softirq_context)
48 # define lockdep_hardirqs_enabled() (this_ 48 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
49 # define lockdep_softirqs_enabled(p) ((p)-> 49 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
50 # define lockdep_hardirq_enter() 50 # define lockdep_hardirq_enter() \
51 do { 51 do { \
52 if (__this_cpu_inc_return(hardirq_cont 52 if (__this_cpu_inc_return(hardirq_context) == 1)\
53 current->hardirq_threaded = 0; 53 current->hardirq_threaded = 0; \
54 } while (0) 54 } while (0)
55 # define lockdep_hardirq_threaded() 55 # define lockdep_hardirq_threaded() \
56 do { 56 do { \
57 current->hardirq_threaded = 1; 57 current->hardirq_threaded = 1; \
58 } while (0) 58 } while (0)
59 # define lockdep_hardirq_exit() 59 # define lockdep_hardirq_exit() \
60 do { 60 do { \
61 __this_cpu_dec(hardirq_context); 61 __this_cpu_dec(hardirq_context); \
62 } while (0) 62 } while (0)
63 63
64 # define lockdep_hrtimer_enter(__hrtimer) 64 # define lockdep_hrtimer_enter(__hrtimer) \
65 ({ 65 ({ \
66 bool __expires_hardirq = true; 66 bool __expires_hardirq = true; \
67 67 \
68 if (!__hrtimer->is_hard) { 68 if (!__hrtimer->is_hard) { \
69 current->irq_config = 1; 69 current->irq_config = 1; \
70 __expires_hardirq = false; 70 __expires_hardirq = false; \
71 } 71 } \
72 __expires_hardirq; 72 __expires_hardirq; \
73 }) 73 })
74 74
75 # define lockdep_hrtimer_exit(__expires_hardir 75 # define lockdep_hrtimer_exit(__expires_hardirq) \
76 do { 76 do { \
77 if (!__expires_hardirq) 77 if (!__expires_hardirq) \
78 current->irq_config = 78 current->irq_config = 0; \
79 } while (0) 79 } while (0)
80 80
81 # define lockdep_posixtimer_enter() 81 # define lockdep_posixtimer_enter() \
82 do { 82 do { \
83 current->irq_config = 1; 83 current->irq_config = 1; \
84 } while (0) 84 } while (0)
85 85
86 # define lockdep_posixtimer_exit() 86 # define lockdep_posixtimer_exit() \
87 do { 87 do { \
88 current->irq_config = 0; 88 current->irq_config = 0; \
89 } while (0) 89 } while (0)
90 90
91 # define lockdep_irq_work_enter(_flags) 91 # define lockdep_irq_work_enter(_flags) \
92 do { 92 do { \
93 if (!((_flags) & IRQ_WORK_HA 93 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
94 current->irq_config = 94 current->irq_config = 1; \
95 } while (0) 95 } while (0)
96 # define lockdep_irq_work_exit(_flags) 96 # define lockdep_irq_work_exit(_flags) \
97 do { 97 do { \
98 if (!((_flags) & IRQ_WORK_HA 98 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
99 current->irq_config = 99 current->irq_config = 0; \
100 } while (0) 100 } while (0)
101 101
102 #else 102 #else
103 # define trace_hardirqs_on_prepare() 103 # define trace_hardirqs_on_prepare() do { } while (0)
104 # define trace_hardirqs_off_finish() 104 # define trace_hardirqs_off_finish() do { } while (0)
105 # define trace_hardirqs_on() 105 # define trace_hardirqs_on() do { } while (0)
106 # define trace_hardirqs_off() 106 # define trace_hardirqs_off() do { } while (0)
107 # define lockdep_hardirq_context() 107 # define lockdep_hardirq_context() 0
108 # define lockdep_softirq_context(p) 108 # define lockdep_softirq_context(p) 0
109 # define lockdep_hardirqs_enabled() 109 # define lockdep_hardirqs_enabled() 0
110 # define lockdep_softirqs_enabled(p) 110 # define lockdep_softirqs_enabled(p) 0
111 # define lockdep_hardirq_enter() 111 # define lockdep_hardirq_enter() do { } while (0)
112 # define lockdep_hardirq_threaded() 112 # define lockdep_hardirq_threaded() do { } while (0)
113 # define lockdep_hardirq_exit() 113 # define lockdep_hardirq_exit() do { } while (0)
114 # define lockdep_softirq_enter() 114 # define lockdep_softirq_enter() do { } while (0)
115 # define lockdep_softirq_exit() 115 # define lockdep_softirq_exit() do { } while (0)
116 # define lockdep_hrtimer_enter(__hrtimer) 116 # define lockdep_hrtimer_enter(__hrtimer) false
117 # define lockdep_hrtimer_exit(__context) 117 # define lockdep_hrtimer_exit(__context) do { (void)(__context); } while (0)
118 # define lockdep_posixtimer_enter() 118 # define lockdep_posixtimer_enter() do { } while (0)
119 # define lockdep_posixtimer_exit() 119 # define lockdep_posixtimer_exit() do { } while (0)
120 # define lockdep_irq_work_enter(__work) 120 # define lockdep_irq_work_enter(__work) do { } while (0)
121 # define lockdep_irq_work_exit(__work) 121 # define lockdep_irq_work_exit(__work) do { } while (0)
122 #endif 122 #endif
123 123
124 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined 124 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT)
125 # define lockdep_softirq_enter() 125 # define lockdep_softirq_enter() \
126 do { 126 do { \
127 current->softirq_context++; 127 current->softirq_context++; \
128 } while (0) 128 } while (0)
129 # define lockdep_softirq_exit() 129 # define lockdep_softirq_exit() \
130 do { 130 do { \
131 current->softirq_context--; 131 current->softirq_context--; \
132 } while (0) 132 } while (0)
133 133
134 #else 134 #else
135 # define lockdep_softirq_enter() 135 # define lockdep_softirq_enter() do { } while (0)
136 # define lockdep_softirq_exit() 136 # define lockdep_softirq_exit() do { } while (0)
137 #endif 137 #endif
138 138
139 #if defined(CONFIG_IRQSOFF_TRACER) || \ 139 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER) 140 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void); 141 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void); 142 extern void start_critical_timings(void);
143 #else 143 #else
144 # define stop_critical_timings() do { } while 144 # define stop_critical_timings() do { } while (0)
145 # define start_critical_timings() do { } while 145 # define start_critical_timings() do { } while (0)
146 #endif 146 #endif
147 147
148 #ifdef CONFIG_DEBUG_IRQFLAGS 148 #ifdef CONFIG_DEBUG_IRQFLAGS
149 extern void warn_bogus_irq_restore(void); 149 extern void warn_bogus_irq_restore(void);
150 #define raw_check_bogus_irq_restore() 150 #define raw_check_bogus_irq_restore() \
151 do { 151 do { \
152 if (unlikely(!arch_irqs_disabl 152 if (unlikely(!arch_irqs_disabled())) \
153 warn_bogus_irq_restore 153 warn_bogus_irq_restore(); \
154 } while (0) 154 } while (0)
155 #else 155 #else
156 #define raw_check_bogus_irq_restore() do { } w 156 #define raw_check_bogus_irq_restore() do { } while (0)
157 #endif 157 #endif
158 158
159 /* 159 /*
160 * Wrap the arch provided IRQ routines to prov 160 * Wrap the arch provided IRQ routines to provide appropriate checks.
161 */ 161 */
162 #define raw_local_irq_disable() arch_l 162 #define raw_local_irq_disable() arch_local_irq_disable()
163 #define raw_local_irq_enable() arch_l 163 #define raw_local_irq_enable() arch_local_irq_enable()
164 #define raw_local_irq_save(flags) 164 #define raw_local_irq_save(flags) \
165 do { 165 do { \
166 typecheck(unsigned long, flags 166 typecheck(unsigned long, flags); \
167 flags = arch_local_irq_save(); 167 flags = arch_local_irq_save(); \
168 } while (0) 168 } while (0)
169 #define raw_local_irq_restore(flags) 169 #define raw_local_irq_restore(flags) \
170 do { 170 do { \
171 typecheck(unsigned long, flags 171 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); 172 raw_check_bogus_irq_restore(); \
173 arch_local_irq_restore(flags); 173 arch_local_irq_restore(flags); \
174 } while (0) 174 } while (0)
175 #define raw_local_save_flags(flags) 175 #define raw_local_save_flags(flags) \
176 do { 176 do { \
177 typecheck(unsigned long, flags 177 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags( 178 flags = arch_local_save_flags(); \
179 } while (0) 179 } while (0)
180 #define raw_irqs_disabled_flags(flags) 180 #define raw_irqs_disabled_flags(flags) \
181 ({ 181 ({ \
182 typecheck(unsigned long, flags 182 typecheck(unsigned long, flags); \
183 arch_irqs_disabled_flags(flags 183 arch_irqs_disabled_flags(flags); \
184 }) 184 })
185 #define raw_irqs_disabled() (arch_ 185 #define raw_irqs_disabled() (arch_irqs_disabled())
186 #define raw_safe_halt() arch_s 186 #define raw_safe_halt() arch_safe_halt()
187 187
188 /* 188 /*
189 * The local_irq_*() APIs are equal to the raw 189 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS. 190 * if !TRACE_IRQFLAGS.
191 */ 191 */
192 #ifdef CONFIG_TRACE_IRQFLAGS 192 #ifdef CONFIG_TRACE_IRQFLAGS
193 193
194 #define local_irq_enable() 194 #define local_irq_enable() \
195 do { 195 do { \
196 trace_hardirqs_on(); 196 trace_hardirqs_on(); \
197 raw_local_irq_enable(); 197 raw_local_irq_enable(); \
198 } while (0) 198 } while (0)
199 199
200 #define local_irq_disable() 200 #define local_irq_disable() \
201 do { 201 do { \
202 bool was_disabled = raw_irqs_d 202 bool was_disabled = raw_irqs_disabled();\
203 raw_local_irq_disable(); 203 raw_local_irq_disable(); \
204 if (!was_disabled) 204 if (!was_disabled) \
205 trace_hardirqs_off(); 205 trace_hardirqs_off(); \
206 } while (0) 206 } while (0)
207 207
208 #define local_irq_save(flags) 208 #define local_irq_save(flags) \
209 do { 209 do { \
210 raw_local_irq_save(flags); 210 raw_local_irq_save(flags); \
211 if (!raw_irqs_disabled_flags(f 211 if (!raw_irqs_disabled_flags(flags)) \
212 trace_hardirqs_off(); 212 trace_hardirqs_off(); \
213 } while (0) 213 } while (0)
214 214
215 #define local_irq_restore(flags) 215 #define local_irq_restore(flags) \
216 do { 216 do { \
217 if (!raw_irqs_disabled_flags(f 217 if (!raw_irqs_disabled_flags(flags)) \
218 trace_hardirqs_on(); 218 trace_hardirqs_on(); \
219 raw_local_irq_restore(flags); 219 raw_local_irq_restore(flags); \
220 } while (0) 220 } while (0)
221 221
222 #define safe_halt() 222 #define safe_halt() \
223 do { 223 do { \
224 trace_hardirqs_on(); 224 trace_hardirqs_on(); \
225 raw_safe_halt(); 225 raw_safe_halt(); \
226 } while (0) 226 } while (0)
227 227
228 228
229 #else /* !CONFIG_TRACE_IRQFLAGS */ 229 #else /* !CONFIG_TRACE_IRQFLAGS */
230 230
231 #define local_irq_enable() do { raw_local 231 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
232 #define local_irq_disable() do { raw_local 232 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
233 #define local_irq_save(flags) do { raw_local 233 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
234 #define local_irq_restore(flags) do { raw_loca 234 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
235 #define safe_halt() do { raw_safe_ 235 #define safe_halt() do { raw_safe_halt(); } while (0)
236 236
237 #endif /* CONFIG_TRACE_IRQFLAGS */ 237 #endif /* CONFIG_TRACE_IRQFLAGS */
238 238
239 #define local_save_flags(flags) raw_local_save 239 #define local_save_flags(flags) raw_local_save_flags(flags)
240 240
241 /* 241 /*
242 * Some architectures don't define arch_irqs_d 242 * Some architectures don't define arch_irqs_disabled(), so even if either
243 * definition would be fine we need to use dif 243 * definition would be fine we need to use different ones for the time being
244 * to avoid build issues. 244 * to avoid build issues.
245 */ 245 */
246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247 #define irqs_disabled() 247 #define irqs_disabled() \
248 ({ 248 ({ \
249 unsigned long _flags; 249 unsigned long _flags; \
250 raw_local_save_flags(_flags); 250 raw_local_save_flags(_flags); \
251 raw_irqs_disabled_flags(_flags 251 raw_irqs_disabled_flags(_flags); \
252 }) 252 })
253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254 #define irqs_disabled() raw_irqs_disabled() 254 #define irqs_disabled() raw_irqs_disabled()
255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
256 256
257 #define irqs_disabled_flags(flags) raw_irqs_di 257 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags)
258 258
259 DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), 259 DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), local_irq_enable())
260 DEFINE_LOCK_GUARD_0(irqsave, 260 DEFINE_LOCK_GUARD_0(irqsave,
261 local_irq_save(_T->flags), 261 local_irq_save(_T->flags),
262 local_irq_restore(_T->flag 262 local_irq_restore(_T->flags),
263 unsigned long flags) 263 unsigned long flags)
264 264
265 #endif 265 #endif
266 266
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