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 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) 110 111#define safe_halt() \ 112 do { \ 113 trace_hardirqs_on(); \ 114 raw_safe_halt(); \ 115 } while (0) 116 117 118#else /* !CONFIG_TRACE_IRQFLAGS */ 119 120#define local_irq_enable() do { raw_local_irq_enable(); } while (0) 121#define local_irq_disable() do { raw_local_irq_disable(); } while (0) 122#define local_irq_save(flags) \ 123 do { \ 124 raw_local_irq_save(flags); \ 125 } while (0) 126#define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 127#define safe_halt() do { raw_safe_halt(); } while (0) 128 129#endif /* CONFIG_TRACE_IRQFLAGS */ 130 131#define local_save_flags(flags) raw_local_save_flags(flags) 132 133/* 134 * Some architectures don't define arch_irqs_disabled(), so even if either 135 * definition would be fine we need to use different ones for the time being 136 * to avoid build issues. 137 */ 138#ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 139#define irqs_disabled() \ 140 ({ \ 141 unsigned long _flags; \ 142 raw_local_save_flags(_flags); \ 143 raw_irqs_disabled_flags(_flags); \ 144 }) 145#else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 146#define irqs_disabled() raw_irqs_disabled() 147#endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 148 149#define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 150 151#endif 152