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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> |
3f307891 | 17 | |
0d38453c | 18 | /* Currently lockdep_softirqs_on/off is used only by lockdep */ |
c3bc8fd6 | 19 | #ifdef CONFIG_PROVE_LOCKING |
0d38453c PZ |
20 | extern void lockdep_softirqs_on(unsigned long ip); |
21 | extern void lockdep_softirqs_off(unsigned long ip); | |
c86e9b98 | 22 | extern void lockdep_hardirqs_on_prepare(unsigned long ip); |
bff1b208 SRV |
23 | extern void lockdep_hardirqs_on(unsigned long ip); |
24 | extern void lockdep_hardirqs_off(unsigned long ip); | |
c3bc8fd6 | 25 | #else |
0d38453c PZ |
26 | static inline void lockdep_softirqs_on(unsigned long ip) { } |
27 | static inline void lockdep_softirqs_off(unsigned long ip) { } | |
c86e9b98 | 28 | static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { } |
bff1b208 SRV |
29 | static inline void lockdep_hardirqs_on(unsigned long ip) { } |
30 | static inline void lockdep_hardirqs_off(unsigned long ip) { } | |
c3bc8fd6 JFG |
31 | #endif |
32 | ||
33 | #ifdef CONFIG_TRACE_IRQFLAGS | |
0995a5df TG |
34 | extern void trace_hardirqs_on_prepare(void); |
35 | extern void trace_hardirqs_off_prepare(void); | |
81d68a96 SR |
36 | extern void trace_hardirqs_on(void); |
37 | extern void trace_hardirqs_off(void); | |
ef996916 PZ |
38 | # define lockdep_hardirq_context(p) ((p)->hardirq_context) |
39 | # define lockdep_softirq_context(p) ((p)->softirq_context) | |
40 | # define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled) | |
41 | # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) | |
2502ec37 | 42 | # define lockdep_hardirq_enter() \ |
b09be676 | 43 | do { \ |
de8f5e4f PZ |
44 | if (!current->hardirq_context++) \ |
45 | current->hardirq_threaded = 0; \ | |
46 | } while (0) | |
d5f744f9 | 47 | # define lockdep_hardirq_threaded() \ |
de8f5e4f PZ |
48 | do { \ |
49 | current->hardirq_threaded = 1; \ | |
b09be676 | 50 | } while (0) |
2502ec37 | 51 | # define lockdep_hardirq_exit() \ |
b09be676 BP |
52 | do { \ |
53 | current->hardirq_context--; \ | |
b09be676 BP |
54 | } while (0) |
55 | # define lockdep_softirq_enter() \ | |
56 | do { \ | |
57 | current->softirq_context++; \ | |
b09be676 BP |
58 | } while (0) |
59 | # define lockdep_softirq_exit() \ | |
60 | do { \ | |
61 | current->softirq_context--; \ | |
b09be676 | 62 | } while (0) |
40db1739 SAS |
63 | |
64 | # define lockdep_hrtimer_enter(__hrtimer) \ | |
73d20564 SAS |
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 | }) | |
40db1739 | 74 | |
73d20564 SAS |
75 | # define lockdep_hrtimer_exit(__expires_hardirq) \ |
76 | do { \ | |
77 | if (!__expires_hardirq) \ | |
40db1739 | 78 | current->irq_config = 0; \ |
73d20564 | 79 | } while (0) |
40db1739 | 80 | |
d53f2b62 SAS |
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 | ||
49915ac3 SAS |
91 | # define lockdep_irq_work_enter(__work) \ |
92 | do { \ | |
93 | if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ | |
94 | current->irq_config = 1; \ | |
95 | } while (0) | |
96 | # define lockdep_irq_work_exit(__work) \ | |
97 | do { \ | |
98 | if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ | |
99 | current->irq_config = 0; \ | |
100 | } while (0) | |
101 | ||
de30a2b3 | 102 | #else |
0995a5df TG |
103 | # define trace_hardirqs_on_prepare() do { } while (0) |
104 | # define trace_hardirqs_off_prepare() do { } while (0) | |
de30a2b3 IM |
105 | # define trace_hardirqs_on() do { } while (0) |
106 | # define trace_hardirqs_off() do { } while (0) | |
ef996916 PZ |
107 | # define lockdep_hardirq_context(p) 0 |
108 | # define lockdep_softirq_context(p) 0 | |
109 | # define lockdep_hardirqs_enabled(p) 0 | |
110 | # define lockdep_softirqs_enabled(p) 0 | |
2502ec37 | 111 | # define lockdep_hardirq_enter() do { } while (0) |
d5f744f9 | 112 | # define lockdep_hardirq_threaded() do { } while (0) |
2502ec37 | 113 | # define lockdep_hardirq_exit() do { } while (0) |
d820ac4c IM |
114 | # define lockdep_softirq_enter() do { } while (0) |
115 | # define lockdep_softirq_exit() do { } while (0) | |
73d20564 SAS |
116 | # define lockdep_hrtimer_enter(__hrtimer) false |
117 | # define lockdep_hrtimer_exit(__context) do { } while (0) | |
d53f2b62 SAS |
118 | # define lockdep_posixtimer_enter() do { } while (0) |
119 | # define lockdep_posixtimer_exit() do { } while (0) | |
49915ac3 SAS |
120 | # define lockdep_irq_work_enter(__work) do { } while (0) |
121 | # define lockdep_irq_work_exit(__work) do { } while (0) | |
de30a2b3 IM |
122 | #endif |
123 | ||
6cd8a4bb SR |
124 | #if defined(CONFIG_IRQSOFF_TRACER) || \ |
125 | defined(CONFIG_PREEMPT_TRACER) | |
81d68a96 SR |
126 | extern void stop_critical_timings(void); |
127 | extern void start_critical_timings(void); | |
128 | #else | |
129 | # define stop_critical_timings() do { } while (0) | |
130 | # define start_critical_timings() do { } while (0) | |
131 | #endif | |
132 | ||
df9ee292 DH |
133 | /* |
134 | * Wrap the arch provided IRQ routines to provide appropriate checks. | |
135 | */ | |
136 | #define raw_local_irq_disable() arch_local_irq_disable() | |
137 | #define raw_local_irq_enable() arch_local_irq_enable() | |
138 | #define raw_local_irq_save(flags) \ | |
139 | do { \ | |
140 | typecheck(unsigned long, flags); \ | |
141 | flags = arch_local_irq_save(); \ | |
142 | } while (0) | |
143 | #define raw_local_irq_restore(flags) \ | |
144 | do { \ | |
145 | typecheck(unsigned long, flags); \ | |
146 | arch_local_irq_restore(flags); \ | |
147 | } while (0) | |
148 | #define raw_local_save_flags(flags) \ | |
149 | do { \ | |
150 | typecheck(unsigned long, flags); \ | |
151 | flags = arch_local_save_flags(); \ | |
152 | } while (0) | |
153 | #define raw_irqs_disabled_flags(flags) \ | |
154 | ({ \ | |
155 | typecheck(unsigned long, flags); \ | |
156 | arch_irqs_disabled_flags(flags); \ | |
157 | }) | |
158 | #define raw_irqs_disabled() (arch_irqs_disabled()) | |
159 | #define raw_safe_halt() arch_safe_halt() | |
de30a2b3 | 160 | |
df9ee292 DH |
161 | /* |
162 | * The local_irq_*() APIs are equal to the raw_local_irq*() | |
163 | * if !TRACE_IRQFLAGS. | |
164 | */ | |
db2dcb4f | 165 | #ifdef CONFIG_TRACE_IRQFLAGS |
de30a2b3 IM |
166 | #define local_irq_enable() \ |
167 | do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) | |
168 | #define local_irq_disable() \ | |
169 | do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) | |
3f307891 SR |
170 | #define local_irq_save(flags) \ |
171 | do { \ | |
3f307891 SR |
172 | raw_local_irq_save(flags); \ |
173 | trace_hardirqs_off(); \ | |
174 | } while (0) | |
de30a2b3 | 175 | |
3f307891 SR |
176 | |
177 | #define local_irq_restore(flags) \ | |
178 | do { \ | |
3f307891 SR |
179 | if (raw_irqs_disabled_flags(flags)) { \ |
180 | raw_local_irq_restore(flags); \ | |
181 | trace_hardirqs_off(); \ | |
182 | } else { \ | |
183 | trace_hardirqs_on(); \ | |
184 | raw_local_irq_restore(flags); \ | |
185 | } \ | |
de30a2b3 | 186 | } while (0) |
df9ee292 DH |
187 | |
188 | #define safe_halt() \ | |
189 | do { \ | |
190 | trace_hardirqs_on(); \ | |
191 | raw_safe_halt(); \ | |
3f307891 | 192 | } while (0) |
de30a2b3 | 193 | |
de30a2b3 | 194 | |
db2dcb4f | 195 | #else /* !CONFIG_TRACE_IRQFLAGS */ |
df9ee292 DH |
196 | |
197 | #define local_irq_enable() do { raw_local_irq_enable(); } while (0) | |
198 | #define local_irq_disable() do { raw_local_irq_disable(); } while (0) | |
199 | #define local_irq_save(flags) \ | |
200 | do { \ | |
201 | raw_local_irq_save(flags); \ | |
202 | } while (0) | |
203 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) | |
df9ee292 DH |
204 | #define safe_halt() do { raw_safe_halt(); } while (0) |
205 | ||
db2dcb4f JB |
206 | #endif /* CONFIG_TRACE_IRQFLAGS */ |
207 | ||
208 | #define local_save_flags(flags) raw_local_save_flags(flags) | |
209 | ||
210 | /* | |
211 | * Some architectures don't define arch_irqs_disabled(), so even if either | |
212 | * definition would be fine we need to use different ones for the time being | |
213 | * to avoid build issues. | |
214 | */ | |
215 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT | |
216 | #define irqs_disabled() \ | |
217 | ({ \ | |
218 | unsigned long _flags; \ | |
219 | raw_local_save_flags(_flags); \ | |
220 | raw_irqs_disabled_flags(_flags); \ | |
221 | }) | |
222 | #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ | |
223 | #define irqs_disabled() raw_irqs_disabled() | |
40b1f4e5 | 224 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
de30a2b3 | 225 | |
db2dcb4f JB |
226 | #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) |
227 | ||
de30a2b3 | 228 | #endif |