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 trace_softirq_enter() do { current->softirq_context++; } while (0) 28 # define trace_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 trace_softirq_enter() do { } while (0) 42 # define trace_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_X86 */ 128 129 #endif 130