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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
de30a2b3 IM |
2 | /* |
3 | * include/linux/irqflags.h | |
4 | * | |
5 | * IRQ flags tracing: follow the state of the hardirq and softirq flags and | |
6 | * provide callbacks for transitions between ON and OFF states. | |
7 | * | |
8 | * This file gets included from lowlevel asm headers too, to provide | |
9 | * wrapped versions of the local_irq_*() APIs, based on the | |
10 | * raw_local_irq_*() macros from the lowlevel headers. | |
11 | */ | |
12 | #ifndef _LINUX_TRACE_IRQFLAGS_H | |
13 | #define _LINUX_TRACE_IRQFLAGS_H | |
14 | ||
3f307891 | 15 | #include <linux/typecheck.h> |
df9ee292 | 16 | #include <asm/irqflags.h> |
a21ee605 | 17 | #include <asm/percpu.h> |
3f307891 | 18 | |
0d38453c | 19 | /* Currently lockdep_softirqs_on/off is used only by lockdep */ |
c3bc8fd6 | 20 | #ifdef CONFIG_PROVE_LOCKING |
0d38453c PZ |
21 | extern void lockdep_softirqs_on(unsigned long ip); |
22 | extern void lockdep_softirqs_off(unsigned long ip); | |
c86e9b98 | 23 | extern void lockdep_hardirqs_on_prepare(unsigned long ip); |
bff1b208 SRV |
24 | extern void lockdep_hardirqs_on(unsigned long ip); |
25 | extern void lockdep_hardirqs_off(unsigned long ip); | |
c3bc8fd6 | 26 | #else |
0d38453c PZ |
27 | static inline void lockdep_softirqs_on(unsigned long ip) { } |
28 | static inline void lockdep_softirqs_off(unsigned long ip) { } | |
c86e9b98 | 29 | static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { } |
bff1b208 SRV |
30 | static inline void lockdep_hardirqs_on(unsigned long ip) { } |
31 | static inline void lockdep_hardirqs_off(unsigned long ip) { } | |
c3bc8fd6 JFG |
32 | #endif |
33 | ||
34 | #ifdef CONFIG_TRACE_IRQFLAGS | |
a21ee605 | 35 | |
0584df9c ME |
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 | ||
a21ee605 PZ |
49 | DECLARE_PER_CPU(int, hardirqs_enabled); |
50 | DECLARE_PER_CPU(int, hardirq_context); | |
51 | ||
00b0ed2d PZ |
52 | extern void trace_hardirqs_on_prepare(void); |
53 | extern void trace_hardirqs_off_finish(void); | |
54 | extern void trace_hardirqs_on(void); | |
55 | extern void trace_hardirqs_off(void); | |
56 | ||
fddf9055 | 57 | # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context)) |
ef996916 | 58 | # define lockdep_softirq_context(p) ((p)->softirq_context) |
f9ad4a5f | 59 | # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) |
ef996916 | 60 | # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) |
a21ee605 PZ |
61 | # define lockdep_hardirq_enter() \ |
62 | do { \ | |
fddf9055 | 63 | if (__this_cpu_inc_return(hardirq_context) == 1)\ |
a21ee605 | 64 | current->hardirq_threaded = 0; \ |
de8f5e4f | 65 | } while (0) |
d5f744f9 | 66 | # define lockdep_hardirq_threaded() \ |
de8f5e4f PZ |
67 | do { \ |
68 | current->hardirq_threaded = 1; \ | |
b09be676 | 69 | } while (0) |
2502ec37 | 70 | # define lockdep_hardirq_exit() \ |
b09be676 | 71 | do { \ |
fddf9055 | 72 | __this_cpu_dec(hardirq_context); \ |
b09be676 BP |
73 | } while (0) |
74 | # define lockdep_softirq_enter() \ | |
75 | do { \ | |
76 | current->softirq_context++; \ | |
b09be676 BP |
77 | } while (0) |
78 | # define lockdep_softirq_exit() \ | |
79 | do { \ | |
80 | current->softirq_context--; \ | |
b09be676 | 81 | } while (0) |
40db1739 SAS |
82 | |
83 | # define lockdep_hrtimer_enter(__hrtimer) \ | |
73d20564 SAS |
84 | ({ \ |
85 | bool __expires_hardirq = true; \ | |
86 | \ | |
87 | if (!__hrtimer->is_hard) { \ | |
88 | current->irq_config = 1; \ | |
89 | __expires_hardirq = false; \ | |
90 | } \ | |
91 | __expires_hardirq; \ | |
92 | }) | |
40db1739 | 93 | |
73d20564 SAS |
94 | # define lockdep_hrtimer_exit(__expires_hardirq) \ |
95 | do { \ | |
96 | if (!__expires_hardirq) \ | |
40db1739 | 97 | current->irq_config = 0; \ |
73d20564 | 98 | } while (0) |
40db1739 | 99 | |
d53f2b62 SAS |
100 | # define lockdep_posixtimer_enter() \ |
101 | do { \ | |
102 | current->irq_config = 1; \ | |
103 | } while (0) | |
104 | ||
105 | # define lockdep_posixtimer_exit() \ | |
106 | do { \ | |
107 | current->irq_config = 0; \ | |
108 | } while (0) | |
109 | ||
2914b0ba | 110 | # define lockdep_irq_work_enter(_flags) \ |
49915ac3 | 111 | do { \ |
2914b0ba | 112 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
49915ac3 SAS |
113 | current->irq_config = 1; \ |
114 | } while (0) | |
2914b0ba | 115 | # define lockdep_irq_work_exit(_flags) \ |
49915ac3 | 116 | do { \ |
2914b0ba | 117 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
49915ac3 SAS |
118 | current->irq_config = 0; \ |
119 | } while (0) | |
120 | ||
de30a2b3 | 121 | #else |
0995a5df | 122 | # define trace_hardirqs_on_prepare() do { } while (0) |
bf2b3008 | 123 | # define trace_hardirqs_off_finish() do { } while (0) |
00b0ed2d PZ |
124 | # define trace_hardirqs_on() do { } while (0) |
125 | # define trace_hardirqs_off() do { } while (0) | |
126 | # define lockdep_hardirq_context() 0 | |
127 | # define lockdep_softirq_context(p) 0 | |
128 | # define lockdep_hardirqs_enabled() 0 | |
129 | # define lockdep_softirqs_enabled(p) 0 | |
130 | # define lockdep_hardirq_enter() do { } while (0) | |
131 | # define lockdep_hardirq_threaded() do { } while (0) | |
132 | # define lockdep_hardirq_exit() do { } while (0) | |
133 | # define lockdep_softirq_enter() do { } while (0) | |
134 | # define lockdep_softirq_exit() do { } while (0) | |
73d20564 SAS |
135 | # define lockdep_hrtimer_enter(__hrtimer) false |
136 | # define lockdep_hrtimer_exit(__context) do { } while (0) | |
d53f2b62 SAS |
137 | # define lockdep_posixtimer_enter() do { } while (0) |
138 | # define lockdep_posixtimer_exit() do { } while (0) | |
49915ac3 SAS |
139 | # define lockdep_irq_work_enter(__work) do { } while (0) |
140 | # define lockdep_irq_work_exit(__work) do { } while (0) | |
de30a2b3 IM |
141 | #endif |
142 | ||
6cd8a4bb SR |
143 | #if defined(CONFIG_IRQSOFF_TRACER) || \ |
144 | defined(CONFIG_PREEMPT_TRACER) | |
81d68a96 SR |
145 | extern void stop_critical_timings(void); |
146 | extern void start_critical_timings(void); | |
147 | #else | |
148 | # define stop_critical_timings() do { } while (0) | |
149 | # define start_critical_timings() do { } while (0) | |
150 | #endif | |
151 | ||
997acaf6 MR |
152 | #ifdef CONFIG_DEBUG_IRQFLAGS |
153 | extern void warn_bogus_irq_restore(void); | |
154 | #define raw_check_bogus_irq_restore() \ | |
155 | do { \ | |
156 | if (unlikely(!arch_irqs_disabled())) \ | |
157 | warn_bogus_irq_restore(); \ | |
158 | } while (0) | |
159 | #else | |
160 | #define raw_check_bogus_irq_restore() do { } while (0) | |
161 | #endif | |
162 | ||
df9ee292 DH |
163 | /* |
164 | * Wrap the arch provided IRQ routines to provide appropriate checks. | |
165 | */ | |
166 | #define raw_local_irq_disable() arch_local_irq_disable() | |
167 | #define raw_local_irq_enable() arch_local_irq_enable() | |
168 | #define raw_local_irq_save(flags) \ | |
169 | do { \ | |
170 | typecheck(unsigned long, flags); \ | |
171 | flags = arch_local_irq_save(); \ | |
172 | } while (0) | |
173 | #define raw_local_irq_restore(flags) \ | |
174 | do { \ | |
175 | typecheck(unsigned long, flags); \ | |
997acaf6 | 176 | raw_check_bogus_irq_restore(); \ |
df9ee292 DH |
177 | arch_local_irq_restore(flags); \ |
178 | } while (0) | |
179 | #define raw_local_save_flags(flags) \ | |
180 | do { \ | |
181 | typecheck(unsigned long, flags); \ | |
182 | flags = arch_local_save_flags(); \ | |
183 | } while (0) | |
184 | #define raw_irqs_disabled_flags(flags) \ | |
185 | ({ \ | |
186 | typecheck(unsigned long, flags); \ | |
187 | arch_irqs_disabled_flags(flags); \ | |
188 | }) | |
189 | #define raw_irqs_disabled() (arch_irqs_disabled()) | |
190 | #define raw_safe_halt() arch_safe_halt() | |
de30a2b3 | 191 | |
df9ee292 DH |
192 | /* |
193 | * The local_irq_*() APIs are equal to the raw_local_irq*() | |
194 | * if !TRACE_IRQFLAGS. | |
195 | */ | |
db2dcb4f | 196 | #ifdef CONFIG_TRACE_IRQFLAGS |
00b0ed2d PZ |
197 | |
198 | #define local_irq_enable() \ | |
199 | do { \ | |
200 | trace_hardirqs_on(); \ | |
201 | raw_local_irq_enable(); \ | |
202 | } while (0) | |
203 | ||
204 | #define local_irq_disable() \ | |
205 | do { \ | |
044d0d6d | 206 | bool was_disabled = raw_irqs_disabled();\ |
00b0ed2d | 207 | raw_local_irq_disable(); \ |
044d0d6d NP |
208 | if (!was_disabled) \ |
209 | trace_hardirqs_off(); \ | |
00b0ed2d PZ |
210 | } while (0) |
211 | ||
3f307891 SR |
212 | #define local_irq_save(flags) \ |
213 | do { \ | |
3f307891 | 214 | raw_local_irq_save(flags); \ |
044d0d6d NP |
215 | if (!raw_irqs_disabled_flags(flags)) \ |
216 | trace_hardirqs_off(); \ | |
3f307891 | 217 | } while (0) |
de30a2b3 | 218 | |
3f307891 SR |
219 | #define local_irq_restore(flags) \ |
220 | do { \ | |
044d0d6d | 221 | if (!raw_irqs_disabled_flags(flags)) \ |
3f307891 | 222 | trace_hardirqs_on(); \ |
044d0d6d | 223 | raw_local_irq_restore(flags); \ |
de30a2b3 | 224 | } while (0) |
df9ee292 DH |
225 | |
226 | #define safe_halt() \ | |
227 | do { \ | |
228 | trace_hardirqs_on(); \ | |
229 | raw_safe_halt(); \ | |
3f307891 | 230 | } while (0) |
de30a2b3 | 231 | |
de30a2b3 | 232 | |
db2dcb4f | 233 | #else /* !CONFIG_TRACE_IRQFLAGS */ |
df9ee292 DH |
234 | |
235 | #define local_irq_enable() do { raw_local_irq_enable(); } while (0) | |
236 | #define local_irq_disable() do { raw_local_irq_disable(); } while (0) | |
00b0ed2d | 237 | #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) |
df9ee292 | 238 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) |
df9ee292 DH |
239 | #define safe_halt() do { raw_safe_halt(); } while (0) |
240 | ||
db2dcb4f JB |
241 | #endif /* CONFIG_TRACE_IRQFLAGS */ |
242 | ||
243 | #define local_save_flags(flags) raw_local_save_flags(flags) | |
244 | ||
245 | /* | |
246 | * Some architectures don't define arch_irqs_disabled(), so even if either | |
247 | * definition would be fine we need to use different ones for the time being | |
248 | * to avoid build issues. | |
249 | */ | |
250 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT | |
251 | #define irqs_disabled() \ | |
252 | ({ \ | |
253 | unsigned long _flags; \ | |
254 | raw_local_save_flags(_flags); \ | |
255 | raw_irqs_disabled_flags(_flags); \ | |
256 | }) | |
257 | #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ | |
258 | #define irqs_disabled() raw_irqs_disabled() | |
40b1f4e5 | 259 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
de30a2b3 | 260 | |
db2dcb4f JB |
261 | #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) |
262 | ||
de30a2b3 | 263 | #endif |