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1 | /* |
2 | * include/linux/irqflags.h |
3 | * |
4 | * IRQ flags tracing: follow the state of the hardirq and softirq flags and |
5 | * provide callbacks for transitions between ON and OFF states. |
6 | * |
7 | * This file gets included from lowlevel asm headers too, to provide |
8 | * wrapped versions of the local_irq_*() APIs, based on the |
9 | * raw_local_irq_*() macros from the lowlevel headers. |
10 | */ |
11 | #ifndef _LINUX_TRACE_IRQFLAGS_H |
12 | #define _LINUX_TRACE_IRQFLAGS_H |
13 | |
14 | #include <linux/typecheck.h> |
15 | #include <asm/irqflags.h> |
16 | |
17 | #ifdef CONFIG_TRACE_IRQFLAGS |
18 | extern void trace_softirqs_on(unsigned long ip); |
19 | extern void trace_softirqs_off(unsigned long ip); |
20 | extern void trace_hardirqs_on(void); |
21 | extern void trace_hardirqs_off(void); |
22 | # define trace_hardirq_context(p) ((p)->hardirq_context) |
23 | # define trace_softirq_context(p) ((p)->softirq_context) |
24 | # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled) |
25 | # define trace_softirqs_enabled(p) ((p)->softirqs_enabled) |
26 | # define trace_hardirq_enter() do { current->hardirq_context++; } while (0) |
27 | # define trace_hardirq_exit() do { current->hardirq_context--; } while (0) |
28 | # define lockdep_softirq_enter() do { current->softirq_context++; } while (0) |
29 | # define lockdep_softirq_exit() do { current->softirq_context--; } while (0) |
30 | # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, |
31 | #else |
32 | # define trace_hardirqs_on() do { } while (0) |
33 | # define trace_hardirqs_off() do { } while (0) |
34 | # define trace_softirqs_on(ip) do { } while (0) |
35 | # define trace_softirqs_off(ip) do { } while (0) |
36 | # define trace_hardirq_context(p) 0 |
37 | # define trace_softirq_context(p) 0 |
38 | # define trace_hardirqs_enabled(p) 0 |
39 | # define trace_softirqs_enabled(p) 0 |
40 | # define trace_hardirq_enter() do { } while (0) |
41 | # define trace_hardirq_exit() do { } while (0) |
42 | # define lockdep_softirq_enter() do { } while (0) |
43 | # define lockdep_softirq_exit() do { } while (0) |
44 | # define INIT_TRACE_IRQFLAGS |
45 | #endif |
46 | |
47 | #if defined(CONFIG_IRQSOFF_TRACER) || \ |
48 | defined(CONFIG_PREEMPT_TRACER) |
49 | extern void stop_critical_timings(void); |
50 | extern void start_critical_timings(void); |
51 | #else |
52 | # define stop_critical_timings() do { } while (0) |
53 | # define start_critical_timings() do { } while (0) |
54 | #endif |
55 | |
56 | /* |
57 | * Wrap the arch provided IRQ routines to provide appropriate checks. |
58 | */ |
59 | #define raw_local_irq_disable() arch_local_irq_disable() |
60 | #define raw_local_irq_enable() arch_local_irq_enable() |
61 | #define raw_local_irq_save(flags) \ |
62 | do { \ |
63 | typecheck(unsigned long, flags); \ |
64 | flags = arch_local_irq_save(); \ |
65 | } while (0) |
66 | #define raw_local_irq_restore(flags) \ |
67 | do { \ |
68 | typecheck(unsigned long, flags); \ |
69 | arch_local_irq_restore(flags); \ |
70 | } while (0) |
71 | #define raw_local_save_flags(flags) \ |
72 | do { \ |
73 | typecheck(unsigned long, flags); \ |
74 | flags = arch_local_save_flags(); \ |
75 | } while (0) |
76 | #define raw_irqs_disabled_flags(flags) \ |
77 | ({ \ |
78 | typecheck(unsigned long, flags); \ |
79 | arch_irqs_disabled_flags(flags); \ |
80 | }) |
81 | #define raw_irqs_disabled() (arch_irqs_disabled()) |
82 | #define raw_safe_halt() arch_safe_halt() |
83 | |
84 | /* |
85 | * The local_irq_*() APIs are equal to the raw_local_irq*() |
86 | * if !TRACE_IRQFLAGS. |
87 | */ |
88 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
89 | #define local_irq_enable() \ |
90 | do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) |
91 | #define local_irq_disable() \ |
92 | do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) |
93 | #define local_irq_save(flags) \ |
94 | do { \ |
95 | raw_local_irq_save(flags); \ |
96 | trace_hardirqs_off(); \ |
97 | } while (0) |
98 | |
99 | |
100 | #define local_irq_restore(flags) \ |
101 | do { \ |
102 | if (raw_irqs_disabled_flags(flags)) { \ |
103 | raw_local_irq_restore(flags); \ |
104 | trace_hardirqs_off(); \ |
105 | } else { \ |
106 | trace_hardirqs_on(); \ |
107 | raw_local_irq_restore(flags); \ |
108 | } \ |
109 | } while (0) |
110 | #define local_save_flags(flags) \ |
111 | do { \ |
112 | raw_local_save_flags(flags); \ |
113 | } while (0) |
114 | |
115 | #define irqs_disabled_flags(flags) \ |
116 | ({ \ |
117 | raw_irqs_disabled_flags(flags); \ |
118 | }) |
119 | |
120 | #define irqs_disabled() \ |
121 | ({ \ |
122 | unsigned long _flags; \ |
123 | raw_local_save_flags(_flags); \ |
124 | raw_irqs_disabled_flags(_flags); \ |
125 | }) |
126 | |
127 | #define safe_halt() \ |
128 | do { \ |
129 | trace_hardirqs_on(); \ |
130 | raw_safe_halt(); \ |
131 | } while (0) |
132 | |
133 | |
134 | #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
135 | |
136 | #define local_irq_enable() do { raw_local_irq_enable(); } while (0) |
137 | #define local_irq_disable() do { raw_local_irq_disable(); } while (0) |
138 | #define local_irq_save(flags) \ |
139 | do { \ |
140 | raw_local_irq_save(flags); \ |
141 | } while (0) |
142 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) |
143 | #define local_save_flags(flags) do { raw_local_save_flags(flags); } while (0) |
144 | #define irqs_disabled() (raw_irqs_disabled()) |
145 | #define irqs_disabled_flags(flags) (raw_irqs_disabled_flags(flags)) |
146 | #define safe_halt() do { raw_safe_halt(); } while (0) |
147 | |
148 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
149 | |
150 | #endif |
151 |
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