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> 17 #include <asm/percpu.h>
20 18
21 /* Currently lockdep_softirqs_on/off is used o 19 /* Currently lockdep_softirqs_on/off is used only by lockdep */
22 #ifdef CONFIG_PROVE_LOCKING 20 #ifdef CONFIG_PROVE_LOCKING
23 extern void lockdep_softirqs_on(unsigned lon 21 extern void lockdep_softirqs_on(unsigned long ip);
24 extern void lockdep_softirqs_off(unsigned lo 22 extern void lockdep_softirqs_off(unsigned long ip);
25 extern void lockdep_hardirqs_on_prepare(void 23 extern void lockdep_hardirqs_on_prepare(void);
26 extern void lockdep_hardirqs_on(unsigned lon 24 extern void lockdep_hardirqs_on(unsigned long ip);
27 extern void lockdep_hardirqs_off(unsigned lo 25 extern void lockdep_hardirqs_off(unsigned long ip);
28 #else 26 #else
29 static inline void lockdep_softirqs_on(unsig 27 static inline void lockdep_softirqs_on(unsigned long ip) { }
30 static inline void lockdep_softirqs_off(unsi 28 static inline void lockdep_softirqs_off(unsigned long ip) { }
31 static inline void lockdep_hardirqs_on_prepa 29 static inline void lockdep_hardirqs_on_prepare(void) { }
32 static inline void lockdep_hardirqs_on(unsig 30 static inline void lockdep_hardirqs_on(unsigned long ip) { }
33 static inline void lockdep_hardirqs_off(unsi 31 static inline void lockdep_hardirqs_off(unsigned long ip) { }
34 #endif 32 #endif
35 33
36 #ifdef CONFIG_TRACE_IRQFLAGS 34 #ifdef CONFIG_TRACE_IRQFLAGS
37 35
>> 36 /* Per-task IRQ trace events information. */
>> 37 struct 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
38 DECLARE_PER_CPU(int, hardirqs_enabled); 49 DECLARE_PER_CPU(int, hardirqs_enabled);
39 DECLARE_PER_CPU(int, hardirq_context); 50 DECLARE_PER_CPU(int, hardirq_context);
40 51
41 extern void trace_hardirqs_on_prepare(void); 52 extern void trace_hardirqs_on_prepare(void);
42 extern void trace_hardirqs_off_finish(void); 53 extern void trace_hardirqs_off_finish(void);
43 extern void trace_hardirqs_on(void); 54 extern void trace_hardirqs_on(void);
44 extern void trace_hardirqs_off(void); 55 extern void trace_hardirqs_off(void);
45 56
46 # define lockdep_hardirq_context() (raw_c 57 # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context))
47 # define lockdep_softirq_context(p) ((p)-> 58 # define lockdep_softirq_context(p) ((p)->softirq_context)
48 # define lockdep_hardirqs_enabled() (this_ 59 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled))
49 # define lockdep_softirqs_enabled(p) ((p)-> 60 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled)
50 # define lockdep_hardirq_enter() 61 # define lockdep_hardirq_enter() \
51 do { 62 do { \
52 if (__this_cpu_inc_return(hardirq_cont 63 if (__this_cpu_inc_return(hardirq_context) == 1)\
53 current->hardirq_threaded = 0; 64 current->hardirq_threaded = 0; \
54 } while (0) 65 } while (0)
55 # define lockdep_hardirq_threaded() 66 # define lockdep_hardirq_threaded() \
56 do { 67 do { \
57 current->hardirq_threaded = 1; 68 current->hardirq_threaded = 1; \
58 } while (0) 69 } while (0)
59 # define lockdep_hardirq_exit() 70 # define lockdep_hardirq_exit() \
60 do { 71 do { \
61 __this_cpu_dec(hardirq_context); 72 __this_cpu_dec(hardirq_context); \
62 } while (0) 73 } while (0)
63 74
64 # define lockdep_hrtimer_enter(__hrtimer) 75 # define lockdep_hrtimer_enter(__hrtimer) \
65 ({ 76 ({ \
66 bool __expires_hardirq = true; 77 bool __expires_hardirq = true; \
67 78 \
68 if (!__hrtimer->is_hard) { 79 if (!__hrtimer->is_hard) { \
69 current->irq_config = 1; 80 current->irq_config = 1; \
70 __expires_hardirq = false; 81 __expires_hardirq = false; \
71 } 82 } \
72 __expires_hardirq; 83 __expires_hardirq; \
73 }) 84 })
74 85
75 # define lockdep_hrtimer_exit(__expires_hardir 86 # define lockdep_hrtimer_exit(__expires_hardirq) \
76 do { 87 do { \
77 if (!__expires_hardirq) 88 if (!__expires_hardirq) \
78 current->irq_config = 89 current->irq_config = 0; \
79 } while (0) 90 } while (0)
80 91
81 # define lockdep_posixtimer_enter() 92 # define lockdep_posixtimer_enter() \
82 do { 93 do { \
83 current->irq_config = 1; 94 current->irq_config = 1; \
84 } while (0) 95 } while (0)
85 96
86 # define lockdep_posixtimer_exit() 97 # define lockdep_posixtimer_exit() \
87 do { 98 do { \
88 current->irq_config = 0; 99 current->irq_config = 0; \
89 } while (0) 100 } while (0)
90 101
91 # define lockdep_irq_work_enter(_flags) 102 # define lockdep_irq_work_enter(_flags) \
92 do { 103 do { \
93 if (!((_flags) & IRQ_WORK_HA 104 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
94 current->irq_config = 105 current->irq_config = 1; \
95 } while (0) 106 } while (0)
96 # define lockdep_irq_work_exit(_flags) 107 # define lockdep_irq_work_exit(_flags) \
97 do { 108 do { \
98 if (!((_flags) & IRQ_WORK_HA 109 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \
99 current->irq_config = 110 current->irq_config = 0; \
100 } while (0) 111 } while (0)
101 112
102 #else 113 #else
103 # define trace_hardirqs_on_prepare() 114 # define trace_hardirqs_on_prepare() do { } while (0)
104 # define trace_hardirqs_off_finish() 115 # define trace_hardirqs_off_finish() do { } while (0)
105 # define trace_hardirqs_on() 116 # define trace_hardirqs_on() do { } while (0)
106 # define trace_hardirqs_off() 117 # define trace_hardirqs_off() do { } while (0)
107 # define lockdep_hardirq_context() 118 # define lockdep_hardirq_context() 0
108 # define lockdep_softirq_context(p) 119 # define lockdep_softirq_context(p) 0
109 # define lockdep_hardirqs_enabled() 120 # define lockdep_hardirqs_enabled() 0
110 # define lockdep_softirqs_enabled(p) 121 # define lockdep_softirqs_enabled(p) 0
111 # define lockdep_hardirq_enter() 122 # define lockdep_hardirq_enter() do { } while (0)
112 # define lockdep_hardirq_threaded() 123 # define lockdep_hardirq_threaded() do { } while (0)
113 # define lockdep_hardirq_exit() 124 # define lockdep_hardirq_exit() do { } while (0)
114 # define lockdep_softirq_enter() 125 # define lockdep_softirq_enter() do { } while (0)
115 # define lockdep_softirq_exit() 126 # define lockdep_softirq_exit() do { } while (0)
116 # define lockdep_hrtimer_enter(__hrtimer) 127 # define lockdep_hrtimer_enter(__hrtimer) false
117 # define lockdep_hrtimer_exit(__context) !! 128 # define lockdep_hrtimer_exit(__context) do { } while (0)
118 # define lockdep_posixtimer_enter() 129 # define lockdep_posixtimer_enter() do { } while (0)
119 # define lockdep_posixtimer_exit() 130 # define lockdep_posixtimer_exit() do { } while (0)
120 # define lockdep_irq_work_enter(__work) 131 # define lockdep_irq_work_enter(__work) do { } while (0)
121 # define lockdep_irq_work_exit(__work) 132 # define lockdep_irq_work_exit(__work) do { } while (0)
122 #endif 133 #endif
123 134
124 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined 135 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT)
125 # define lockdep_softirq_enter() 136 # define lockdep_softirq_enter() \
126 do { 137 do { \
127 current->softirq_context++; 138 current->softirq_context++; \
128 } while (0) 139 } while (0)
129 # define lockdep_softirq_exit() 140 # define lockdep_softirq_exit() \
130 do { 141 do { \
131 current->softirq_context--; 142 current->softirq_context--; \
132 } while (0) 143 } while (0)
133 144
134 #else 145 #else
135 # define lockdep_softirq_enter() 146 # define lockdep_softirq_enter() do { } while (0)
136 # define lockdep_softirq_exit() 147 # define lockdep_softirq_exit() do { } while (0)
137 #endif 148 #endif
138 149
139 #if defined(CONFIG_IRQSOFF_TRACER) || \ 150 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER) 151 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void); 152 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void); 153 extern void start_critical_timings(void);
143 #else 154 #else
144 # define stop_critical_timings() do { } while 155 # define stop_critical_timings() do { } while (0)
145 # define start_critical_timings() do { } while 156 # define start_critical_timings() do { } while (0)
146 #endif 157 #endif
147 158
148 #ifdef CONFIG_DEBUG_IRQFLAGS 159 #ifdef CONFIG_DEBUG_IRQFLAGS
149 extern void warn_bogus_irq_restore(void); 160 extern void warn_bogus_irq_restore(void);
150 #define raw_check_bogus_irq_restore() 161 #define raw_check_bogus_irq_restore() \
151 do { 162 do { \
152 if (unlikely(!arch_irqs_disabl 163 if (unlikely(!arch_irqs_disabled())) \
153 warn_bogus_irq_restore 164 warn_bogus_irq_restore(); \
154 } while (0) 165 } while (0)
155 #else 166 #else
156 #define raw_check_bogus_irq_restore() do { } w 167 #define raw_check_bogus_irq_restore() do { } while (0)
157 #endif 168 #endif
158 169
159 /* 170 /*
160 * Wrap the arch provided IRQ routines to prov 171 * Wrap the arch provided IRQ routines to provide appropriate checks.
161 */ 172 */
162 #define raw_local_irq_disable() arch_l 173 #define raw_local_irq_disable() arch_local_irq_disable()
163 #define raw_local_irq_enable() arch_l 174 #define raw_local_irq_enable() arch_local_irq_enable()
164 #define raw_local_irq_save(flags) 175 #define raw_local_irq_save(flags) \
165 do { 176 do { \
166 typecheck(unsigned long, flags 177 typecheck(unsigned long, flags); \
167 flags = arch_local_irq_save(); 178 flags = arch_local_irq_save(); \
168 } while (0) 179 } while (0)
169 #define raw_local_irq_restore(flags) 180 #define raw_local_irq_restore(flags) \
170 do { 181 do { \
171 typecheck(unsigned long, flags 182 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); 183 raw_check_bogus_irq_restore(); \
173 arch_local_irq_restore(flags); 184 arch_local_irq_restore(flags); \
174 } while (0) 185 } while (0)
175 #define raw_local_save_flags(flags) 186 #define raw_local_save_flags(flags) \
176 do { 187 do { \
177 typecheck(unsigned long, flags 188 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags( 189 flags = arch_local_save_flags(); \
179 } while (0) 190 } while (0)
180 #define raw_irqs_disabled_flags(flags) 191 #define raw_irqs_disabled_flags(flags) \
181 ({ 192 ({ \
182 typecheck(unsigned long, flags 193 typecheck(unsigned long, flags); \
183 arch_irqs_disabled_flags(flags 194 arch_irqs_disabled_flags(flags); \
184 }) 195 })
185 #define raw_irqs_disabled() (arch_ 196 #define raw_irqs_disabled() (arch_irqs_disabled())
186 #define raw_safe_halt() arch_s 197 #define raw_safe_halt() arch_safe_halt()
187 198
188 /* 199 /*
189 * The local_irq_*() APIs are equal to the raw 200 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS. 201 * if !TRACE_IRQFLAGS.
191 */ 202 */
192 #ifdef CONFIG_TRACE_IRQFLAGS 203 #ifdef CONFIG_TRACE_IRQFLAGS
193 204
194 #define local_irq_enable() 205 #define local_irq_enable() \
195 do { 206 do { \
196 trace_hardirqs_on(); 207 trace_hardirqs_on(); \
197 raw_local_irq_enable(); 208 raw_local_irq_enable(); \
198 } while (0) 209 } while (0)
199 210
200 #define local_irq_disable() 211 #define local_irq_disable() \
201 do { 212 do { \
202 bool was_disabled = raw_irqs_d 213 bool was_disabled = raw_irqs_disabled();\
203 raw_local_irq_disable(); 214 raw_local_irq_disable(); \
204 if (!was_disabled) 215 if (!was_disabled) \
205 trace_hardirqs_off(); 216 trace_hardirqs_off(); \
206 } while (0) 217 } while (0)
207 218
208 #define local_irq_save(flags) 219 #define local_irq_save(flags) \
209 do { 220 do { \
210 raw_local_irq_save(flags); 221 raw_local_irq_save(flags); \
211 if (!raw_irqs_disabled_flags(f 222 if (!raw_irqs_disabled_flags(flags)) \
212 trace_hardirqs_off(); 223 trace_hardirqs_off(); \
213 } while (0) 224 } while (0)
214 225
215 #define local_irq_restore(flags) 226 #define local_irq_restore(flags) \
216 do { 227 do { \
217 if (!raw_irqs_disabled_flags(f 228 if (!raw_irqs_disabled_flags(flags)) \
218 trace_hardirqs_on(); 229 trace_hardirqs_on(); \
219 raw_local_irq_restore(flags); 230 raw_local_irq_restore(flags); \
220 } while (0) 231 } while (0)
221 232
222 #define safe_halt() 233 #define safe_halt() \
223 do { 234 do { \
224 trace_hardirqs_on(); 235 trace_hardirqs_on(); \
225 raw_safe_halt(); 236 raw_safe_halt(); \
226 } while (0) 237 } while (0)
227 238
228 239
229 #else /* !CONFIG_TRACE_IRQFLAGS */ 240 #else /* !CONFIG_TRACE_IRQFLAGS */
230 241
231 #define local_irq_enable() do { raw_local 242 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
232 #define local_irq_disable() do { raw_local 243 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
233 #define local_irq_save(flags) do { raw_local 244 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0)
234 #define local_irq_restore(flags) do { raw_loca 245 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
235 #define safe_halt() do { raw_safe_ 246 #define safe_halt() do { raw_safe_halt(); } while (0)
236 247
237 #endif /* CONFIG_TRACE_IRQFLAGS */ 248 #endif /* CONFIG_TRACE_IRQFLAGS */
238 249
239 #define local_save_flags(flags) raw_local_save 250 #define local_save_flags(flags) raw_local_save_flags(flags)
240 251
241 /* 252 /*
242 * Some architectures don't define arch_irqs_d 253 * Some architectures don't define arch_irqs_disabled(), so even if either
243 * definition would be fine we need to use dif 254 * definition would be fine we need to use different ones for the time being
244 * to avoid build issues. 255 * to avoid build issues.
245 */ 256 */
246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 257 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247 #define irqs_disabled() 258 #define irqs_disabled() \
248 ({ 259 ({ \
249 unsigned long _flags; 260 unsigned long _flags; \
250 raw_local_save_flags(_flags); 261 raw_local_save_flags(_flags); \
251 raw_irqs_disabled_flags(_flags 262 raw_irqs_disabled_flags(_flags); \
252 }) 263 })
253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 264 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254 #define irqs_disabled() raw_irqs_disabled() 265 #define irqs_disabled() raw_irqs_disabled()
255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 266 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
256 267
257 #define irqs_disabled_flags(flags) raw_irqs_di 268 #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) <<
264 269
265 #endif 270 #endif
266 271
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