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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 | |
c3bc8fd6 JFG |
18 | /* Currently trace_softirqs_on/off is used only by lockdep */ |
19 | #ifdef CONFIG_PROVE_LOCKING | |
de30a2b3 IM |
20 | extern void trace_softirqs_on(unsigned long ip); |
21 | extern void trace_softirqs_off(unsigned long ip); | |
bff1b208 SRV |
22 | extern void lockdep_hardirqs_on(unsigned long ip); |
23 | extern void lockdep_hardirqs_off(unsigned long ip); | |
c3bc8fd6 | 24 | #else |
bff1b208 SRV |
25 | static inline void trace_softirqs_on(unsigned long ip) { } |
26 | static inline void trace_softirqs_off(unsigned long ip) { } | |
27 | static inline void lockdep_hardirqs_on(unsigned long ip) { } | |
28 | static inline void lockdep_hardirqs_off(unsigned long ip) { } | |
c3bc8fd6 JFG |
29 | #endif |
30 | ||
31 | #ifdef CONFIG_TRACE_IRQFLAGS | |
81d68a96 SR |
32 | extern void trace_hardirqs_on(void); |
33 | extern void trace_hardirqs_off(void); | |
de30a2b3 IM |
34 | # define trace_hardirq_context(p) ((p)->hardirq_context) |
35 | # define trace_softirq_context(p) ((p)->softirq_context) | |
36 | # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled) | |
37 | # define trace_softirqs_enabled(p) ((p)->softirqs_enabled) | |
2502ec37 | 38 | # define lockdep_hardirq_enter() \ |
b09be676 BP |
39 | do { \ |
40 | current->hardirq_context++; \ | |
b09be676 | 41 | } while (0) |
2502ec37 | 42 | # define lockdep_hardirq_exit() \ |
b09be676 BP |
43 | do { \ |
44 | current->hardirq_context--; \ | |
b09be676 BP |
45 | } while (0) |
46 | # define lockdep_softirq_enter() \ | |
47 | do { \ | |
48 | current->softirq_context++; \ | |
b09be676 BP |
49 | } while (0) |
50 | # define lockdep_softirq_exit() \ | |
51 | do { \ | |
52 | current->softirq_context--; \ | |
b09be676 | 53 | } while (0) |
de30a2b3 IM |
54 | #else |
55 | # define trace_hardirqs_on() do { } while (0) | |
56 | # define trace_hardirqs_off() do { } while (0) | |
de30a2b3 IM |
57 | # define trace_hardirq_context(p) 0 |
58 | # define trace_softirq_context(p) 0 | |
59 | # define trace_hardirqs_enabled(p) 0 | |
60 | # define trace_softirqs_enabled(p) 0 | |
2502ec37 TG |
61 | # define lockdep_hardirq_enter() do { } while (0) |
62 | # define lockdep_hardirq_exit() do { } while (0) | |
d820ac4c IM |
63 | # define lockdep_softirq_enter() do { } while (0) |
64 | # define lockdep_softirq_exit() do { } while (0) | |
de30a2b3 IM |
65 | #endif |
66 | ||
6cd8a4bb SR |
67 | #if defined(CONFIG_IRQSOFF_TRACER) || \ |
68 | defined(CONFIG_PREEMPT_TRACER) | |
81d68a96 SR |
69 | extern void stop_critical_timings(void); |
70 | extern void start_critical_timings(void); | |
71 | #else | |
72 | # define stop_critical_timings() do { } while (0) | |
73 | # define start_critical_timings() do { } while (0) | |
74 | #endif | |
75 | ||
df9ee292 DH |
76 | /* |
77 | * Wrap the arch provided IRQ routines to provide appropriate checks. | |
78 | */ | |
79 | #define raw_local_irq_disable() arch_local_irq_disable() | |
80 | #define raw_local_irq_enable() arch_local_irq_enable() | |
81 | #define raw_local_irq_save(flags) \ | |
82 | do { \ | |
83 | typecheck(unsigned long, flags); \ | |
84 | flags = arch_local_irq_save(); \ | |
85 | } while (0) | |
86 | #define raw_local_irq_restore(flags) \ | |
87 | do { \ | |
88 | typecheck(unsigned long, flags); \ | |
89 | arch_local_irq_restore(flags); \ | |
90 | } while (0) | |
91 | #define raw_local_save_flags(flags) \ | |
92 | do { \ | |
93 | typecheck(unsigned long, flags); \ | |
94 | flags = arch_local_save_flags(); \ | |
95 | } while (0) | |
96 | #define raw_irqs_disabled_flags(flags) \ | |
97 | ({ \ | |
98 | typecheck(unsigned long, flags); \ | |
99 | arch_irqs_disabled_flags(flags); \ | |
100 | }) | |
101 | #define raw_irqs_disabled() (arch_irqs_disabled()) | |
102 | #define raw_safe_halt() arch_safe_halt() | |
de30a2b3 | 103 | |
df9ee292 DH |
104 | /* |
105 | * The local_irq_*() APIs are equal to the raw_local_irq*() | |
106 | * if !TRACE_IRQFLAGS. | |
107 | */ | |
db2dcb4f | 108 | #ifdef CONFIG_TRACE_IRQFLAGS |
de30a2b3 IM |
109 | #define local_irq_enable() \ |
110 | do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) | |
111 | #define local_irq_disable() \ | |
112 | do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) | |
3f307891 SR |
113 | #define local_irq_save(flags) \ |
114 | do { \ | |
3f307891 SR |
115 | raw_local_irq_save(flags); \ |
116 | trace_hardirqs_off(); \ | |
117 | } while (0) | |
de30a2b3 | 118 | |
3f307891 SR |
119 | |
120 | #define local_irq_restore(flags) \ | |
121 | do { \ | |
3f307891 SR |
122 | if (raw_irqs_disabled_flags(flags)) { \ |
123 | raw_local_irq_restore(flags); \ | |
124 | trace_hardirqs_off(); \ | |
125 | } else { \ | |
126 | trace_hardirqs_on(); \ | |
127 | raw_local_irq_restore(flags); \ | |
128 | } \ | |
de30a2b3 | 129 | } while (0) |
df9ee292 DH |
130 | |
131 | #define safe_halt() \ | |
132 | do { \ | |
133 | trace_hardirqs_on(); \ | |
134 | raw_safe_halt(); \ | |
3f307891 | 135 | } while (0) |
de30a2b3 | 136 | |
de30a2b3 | 137 | |
db2dcb4f | 138 | #else /* !CONFIG_TRACE_IRQFLAGS */ |
df9ee292 DH |
139 | |
140 | #define local_irq_enable() do { raw_local_irq_enable(); } while (0) | |
141 | #define local_irq_disable() do { raw_local_irq_disable(); } while (0) | |
142 | #define local_irq_save(flags) \ | |
143 | do { \ | |
144 | raw_local_irq_save(flags); \ | |
145 | } while (0) | |
146 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) | |
df9ee292 DH |
147 | #define safe_halt() do { raw_safe_halt(); } while (0) |
148 | ||
db2dcb4f JB |
149 | #endif /* CONFIG_TRACE_IRQFLAGS */ |
150 | ||
151 | #define local_save_flags(flags) raw_local_save_flags(flags) | |
152 | ||
153 | /* | |
154 | * Some architectures don't define arch_irqs_disabled(), so even if either | |
155 | * definition would be fine we need to use different ones for the time being | |
156 | * to avoid build issues. | |
157 | */ | |
158 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT | |
159 | #define irqs_disabled() \ | |
160 | ({ \ | |
161 | unsigned long _flags; \ | |
162 | raw_local_save_flags(_flags); \ | |
163 | raw_irqs_disabled_flags(_flags); \ | |
164 | }) | |
165 | #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ | |
166 | #define irqs_disabled() raw_irqs_disabled() | |
40b1f4e5 | 167 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
de30a2b3 | 168 | |
db2dcb4f JB |
169 | #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) |
170 | ||
de30a2b3 | 171 | #endif |