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