| 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 | |
| 16 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 17 | extern void trace_softirqs_on(unsigned long ip); |
| 18 | extern void trace_softirqs_off(unsigned long ip); |
| 19 | extern void trace_hardirqs_on(void); |
| 20 | extern void trace_hardirqs_off(void); |
| 21 | # define trace_hardirq_context(p) ((p)->hardirq_context) |
| 22 | # define trace_softirq_context(p) ((p)->softirq_context) |
| 23 | # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled) |
| 24 | # define trace_softirqs_enabled(p) ((p)->softirqs_enabled) |
| 25 | # define trace_hardirq_enter() do { current->hardirq_context++; } while (0) |
| 26 | # define trace_hardirq_exit() do { current->hardirq_context--; } while (0) |
| 27 | # define lockdep_softirq_enter() do { current->softirq_context++; } while (0) |
| 28 | # define lockdep_softirq_exit() do { current->softirq_context--; } while (0) |
| 29 | # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, |
| 30 | #else |
| 31 | # define trace_hardirqs_on() do { } while (0) |
| 32 | # define trace_hardirqs_off() do { } while (0) |
| 33 | # define trace_softirqs_on(ip) do { } while (0) |
| 34 | # define trace_softirqs_off(ip) do { } while (0) |
| 35 | # define trace_hardirq_context(p) 0 |
| 36 | # define trace_softirq_context(p) 0 |
| 37 | # define trace_hardirqs_enabled(p) 0 |
| 38 | # define trace_softirqs_enabled(p) 0 |
| 39 | # define trace_hardirq_enter() do { } while (0) |
| 40 | # define trace_hardirq_exit() do { } while (0) |
| 41 | # define lockdep_softirq_enter() do { } while (0) |
| 42 | # define lockdep_softirq_exit() do { } while (0) |
| 43 | # define INIT_TRACE_IRQFLAGS |
| 44 | #endif |
| 45 | |
| 46 | #if defined(CONFIG_IRQSOFF_TRACER) || \ |
| 47 | defined(CONFIG_PREEMPT_TRACER) |
| 48 | extern void stop_critical_timings(void); |
| 49 | extern void start_critical_timings(void); |
| 50 | #else |
| 51 | # define stop_critical_timings() do { } while (0) |
| 52 | # define start_critical_timings() do { } while (0) |
| 53 | #endif |
| 54 | |
| 55 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
| 56 | |
| 57 | #include <asm/irqflags.h> |
| 58 | |
| 59 | #define local_irq_enable() \ |
| 60 | do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) |
| 61 | #define local_irq_disable() \ |
| 62 | do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) |
| 63 | #define local_irq_save(flags) \ |
| 64 | do { \ |
| 65 | typecheck(unsigned long, flags); \ |
| 66 | raw_local_irq_save(flags); \ |
| 67 | trace_hardirqs_off(); \ |
| 68 | } while (0) |
| 69 | |
| 70 | |
| 71 | #define local_irq_restore(flags) \ |
| 72 | do { \ |
| 73 | typecheck(unsigned long, flags); \ |
| 74 | if (raw_irqs_disabled_flags(flags)) { \ |
| 75 | raw_local_irq_restore(flags); \ |
| 76 | trace_hardirqs_off(); \ |
| 77 | } else { \ |
| 78 | trace_hardirqs_on(); \ |
| 79 | raw_local_irq_restore(flags); \ |
| 80 | } \ |
| 81 | } while (0) |
| 82 | #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
| 83 | /* |
| 84 | * The local_irq_*() APIs are equal to the raw_local_irq*() |
| 85 | * if !TRACE_IRQFLAGS. |
| 86 | */ |
| 87 | # define raw_local_irq_disable() local_irq_disable() |
| 88 | # define raw_local_irq_enable() local_irq_enable() |
| 89 | # define raw_local_irq_save(flags) \ |
| 90 | do { \ |
| 91 | typecheck(unsigned long, flags); \ |
| 92 | local_irq_save(flags); \ |
| 93 | } while (0) |
| 94 | # define raw_local_irq_restore(flags) \ |
| 95 | do { \ |
| 96 | typecheck(unsigned long, flags); \ |
| 97 | local_irq_restore(flags); \ |
| 98 | } while (0) |
| 99 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
| 100 | |
| 101 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
| 102 | #define safe_halt() \ |
| 103 | do { \ |
| 104 | trace_hardirqs_on(); \ |
| 105 | raw_safe_halt(); \ |
| 106 | } while (0) |
| 107 | |
| 108 | #define local_save_flags(flags) \ |
| 109 | do { \ |
| 110 | typecheck(unsigned long, flags); \ |
| 111 | raw_local_save_flags(flags); \ |
| 112 | } while (0) |
| 113 | |
| 114 | #define irqs_disabled() \ |
| 115 | ({ \ |
| 116 | unsigned long _flags; \ |
| 117 | \ |
| 118 | raw_local_save_flags(_flags); \ |
| 119 | raw_irqs_disabled_flags(_flags); \ |
| 120 | }) |
| 121 | |
| 122 | #define irqs_disabled_flags(flags) \ |
| 123 | ({ \ |
| 124 | typecheck(unsigned long, flags); \ |
| 125 | raw_irqs_disabled_flags(flags); \ |
| 126 | }) |
| 127 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
| 128 | |
| 129 | #endif |