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 <<
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 17
36 #ifdef CONFIG_TRACE_IRQFLAGS 18 #ifdef CONFIG_TRACE_IRQFLAGS
37 !! 19 extern void trace_softirqs_on(unsigned long ip);
38 DECLARE_PER_CPU(int, hardirqs_enabled); !! 20 extern void trace_softirqs_off(unsigned long ip);
39 DECLARE_PER_CPU(int, hardirq_context); !! 21 extern void trace_hardirqs_on(void);
40 !! 22 extern void trace_hardirqs_off(void);
41 extern void trace_hardirqs_on_prepare(void); !! 23 # define trace_hardirq_context(p) ((p)->hardirq_context)
42 extern void trace_hardirqs_off_finish(void); !! 24 # define trace_softirq_context(p) ((p)->softirq_context)
43 extern void trace_hardirqs_on(void); !! 25 # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled)
44 extern void trace_hardirqs_off(void); !! 26 # define trace_softirqs_enabled(p) ((p)->softirqs_enabled)
45 !! 27 # define trace_hardirq_enter() \
46 # define lockdep_hardirq_context() (raw_c <<
47 # define lockdep_softirq_context(p) ((p)-> <<
48 # define lockdep_hardirqs_enabled() (this_ <<
49 # define lockdep_softirqs_enabled(p) ((p)-> <<
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 { 28 do { \
57 current->hardirq_threaded = 1; !! 29 current->hardirq_context++; \
>> 30 crossrelease_hist_start(XHLOCK_HARD); \
58 } while (0) 31 } while (0)
59 # define lockdep_hardirq_exit() !! 32 # define trace_hardirq_exit() \
60 do { 33 do { \
61 __this_cpu_dec(hardirq_context); !! 34 current->hardirq_context--; \
>> 35 crossrelease_hist_end(XHLOCK_HARD); \
62 } while (0) 36 } 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() 37 # define lockdep_softirq_enter() \
126 do { 38 do { \
127 current->softirq_context++; 39 current->softirq_context++; \
>> 40 crossrelease_hist_start(XHLOCK_SOFT); \
128 } while (0) 41 } while (0)
129 # define lockdep_softirq_exit() 42 # define lockdep_softirq_exit() \
130 do { 43 do { \
131 current->softirq_context--; 44 current->softirq_context--; \
>> 45 crossrelease_hist_end(XHLOCK_SOFT); \
132 } while (0) 46 } while (0)
133 !! 47 # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1,
134 #else 48 #else
135 # define lockdep_softirq_enter() !! 49 # define trace_hardirqs_on() do { } while (0)
136 # define lockdep_softirq_exit() !! 50 # define trace_hardirqs_off() do { } while (0)
>> 51 # define trace_softirqs_on(ip) do { } while (0)
>> 52 # define trace_softirqs_off(ip) do { } while (0)
>> 53 # define trace_hardirq_context(p) 0
>> 54 # define trace_softirq_context(p) 0
>> 55 # define trace_hardirqs_enabled(p) 0
>> 56 # define trace_softirqs_enabled(p) 0
>> 57 # define trace_hardirq_enter() do { } while (0)
>> 58 # define trace_hardirq_exit() do { } while (0)
>> 59 # define lockdep_softirq_enter() do { } while (0)
>> 60 # define lockdep_softirq_exit() do { } while (0)
>> 61 # define INIT_TRACE_IRQFLAGS
137 #endif 62 #endif
138 63
139 #if defined(CONFIG_IRQSOFF_TRACER) || \ 64 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER) 65 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void); 66 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void); 67 extern void start_critical_timings(void);
143 #else 68 #else
144 # define stop_critical_timings() do { } while 69 # define stop_critical_timings() do { } while (0)
145 # define start_critical_timings() do { } while 70 # define start_critical_timings() do { } while (0)
146 #endif 71 #endif
147 72
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 /* 73 /*
160 * Wrap the arch provided IRQ routines to prov 74 * Wrap the arch provided IRQ routines to provide appropriate checks.
161 */ 75 */
162 #define raw_local_irq_disable() arch_l 76 #define raw_local_irq_disable() arch_local_irq_disable()
163 #define raw_local_irq_enable() arch_l 77 #define raw_local_irq_enable() arch_local_irq_enable()
164 #define raw_local_irq_save(flags) 78 #define raw_local_irq_save(flags) \
165 do { 79 do { \
166 typecheck(unsigned long, flags 80 typecheck(unsigned long, flags); \
167 flags = arch_local_irq_save(); 81 flags = arch_local_irq_save(); \
168 } while (0) 82 } while (0)
169 #define raw_local_irq_restore(flags) 83 #define raw_local_irq_restore(flags) \
170 do { 84 do { \
171 typecheck(unsigned long, flags 85 typecheck(unsigned long, flags); \
172 raw_check_bogus_irq_restore(); <<
173 arch_local_irq_restore(flags); 86 arch_local_irq_restore(flags); \
174 } while (0) 87 } while (0)
175 #define raw_local_save_flags(flags) 88 #define raw_local_save_flags(flags) \
176 do { 89 do { \
177 typecheck(unsigned long, flags 90 typecheck(unsigned long, flags); \
178 flags = arch_local_save_flags( 91 flags = arch_local_save_flags(); \
179 } while (0) 92 } while (0)
180 #define raw_irqs_disabled_flags(flags) 93 #define raw_irqs_disabled_flags(flags) \
181 ({ 94 ({ \
182 typecheck(unsigned long, flags 95 typecheck(unsigned long, flags); \
183 arch_irqs_disabled_flags(flags 96 arch_irqs_disabled_flags(flags); \
184 }) 97 })
185 #define raw_irqs_disabled() (arch_ 98 #define raw_irqs_disabled() (arch_irqs_disabled())
186 #define raw_safe_halt() arch_s 99 #define raw_safe_halt() arch_safe_halt()
187 100
188 /* 101 /*
189 * The local_irq_*() APIs are equal to the raw 102 * The local_irq_*() APIs are equal to the raw_local_irq*()
190 * if !TRACE_IRQFLAGS. 103 * if !TRACE_IRQFLAGS.
191 */ 104 */
192 #ifdef CONFIG_TRACE_IRQFLAGS 105 #ifdef CONFIG_TRACE_IRQFLAGS
193 !! 106 #define local_irq_enable() \
194 #define local_irq_enable() !! 107 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0)
195 do { !! 108 #define local_irq_disable() \
196 trace_hardirqs_on(); !! 109 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) 110 #define local_irq_save(flags) \
209 do { 111 do { \
210 raw_local_irq_save(flags); 112 raw_local_irq_save(flags); \
211 if (!raw_irqs_disabled_flags(f !! 113 trace_hardirqs_off(); \
212 trace_hardirqs_off(); <<
213 } while (0) 114 } while (0)
214 115
>> 116
215 #define local_irq_restore(flags) 117 #define local_irq_restore(flags) \
216 do { 118 do { \
217 if (!raw_irqs_disabled_flags(f !! 119 if (raw_irqs_disabled_flags(flags)) { \
>> 120 raw_local_irq_restore(flags); \
>> 121 trace_hardirqs_off(); \
>> 122 } else { \
218 trace_hardirqs_on(); 123 trace_hardirqs_on(); \
219 raw_local_irq_restore(flags); !! 124 raw_local_irq_restore(flags); \
>> 125 } \
220 } while (0) 126 } while (0)
221 127
222 #define safe_halt() 128 #define safe_halt() \
223 do { 129 do { \
224 trace_hardirqs_on(); 130 trace_hardirqs_on(); \
225 raw_safe_halt(); 131 raw_safe_halt(); \
226 } while (0) 132 } while (0)
227 133
228 134
229 #else /* !CONFIG_TRACE_IRQFLAGS */ 135 #else /* !CONFIG_TRACE_IRQFLAGS */
230 136
231 #define local_irq_enable() do { raw_local 137 #define local_irq_enable() do { raw_local_irq_enable(); } while (0)
232 #define local_irq_disable() do { raw_local 138 #define local_irq_disable() do { raw_local_irq_disable(); } while (0)
233 #define local_irq_save(flags) do { raw_local !! 139 #define local_irq_save(flags) \
>> 140 do { \
>> 141 raw_local_irq_save(flags); \
>> 142 } while (0)
234 #define local_irq_restore(flags) do { raw_loca 143 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0)
235 #define safe_halt() do { raw_safe_ 144 #define safe_halt() do { raw_safe_halt(); } while (0)
236 145
237 #endif /* CONFIG_TRACE_IRQFLAGS */ 146 #endif /* CONFIG_TRACE_IRQFLAGS */
238 147
239 #define local_save_flags(flags) raw_local_save 148 #define local_save_flags(flags) raw_local_save_flags(flags)
240 149
241 /* 150 /*
242 * Some architectures don't define arch_irqs_d 151 * Some architectures don't define arch_irqs_disabled(), so even if either
243 * definition would be fine we need to use dif 152 * definition would be fine we need to use different ones for the time being
244 * to avoid build issues. 153 * to avoid build issues.
245 */ 154 */
246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 155 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247 #define irqs_disabled() 156 #define irqs_disabled() \
248 ({ 157 ({ \
249 unsigned long _flags; 158 unsigned long _flags; \
250 raw_local_save_flags(_flags); 159 raw_local_save_flags(_flags); \
251 raw_irqs_disabled_flags(_flags 160 raw_irqs_disabled_flags(_flags); \
252 }) 161 })
253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 162 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254 #define irqs_disabled() raw_irqs_disabled() 163 #define irqs_disabled() raw_irqs_disabled()
255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 164 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
256 165
257 #define irqs_disabled_flags(flags) raw_irqs_di 166 #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) <<
264 167
265 #endif 168 #endif
266 169
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