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() \ 27 do { \ 28 current->hardirq_context++; \ 29 crossrelease_hist_start(XHLOCK_HARD); \ 30 } while (0) 31 # define trace_hardirq_exit() \ 32 do { \ 33 current->hardirq_context--; \ 34 crossrelease_hist_end(XHLOCK_HARD); \ 35 } while (0) 36 # define lockdep_softirq_enter() \ 37 do { \ 38 current->softirq_context++; \ 39 crossrelease_hist_start(XHLOCK_SOFT); \ 40 } while (0) 41 # define lockdep_softirq_exit() \ 42 do { \ 43 current->softirq_context--; \ 44 crossrelease_hist_end(XHLOCK_SOFT); \ 45 } while (0) 46 # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, 47 #else 48 # define trace_hardirqs_on() do { } while (0) 49 # define trace_hardirqs_off() do { } while (0) 50 # define trace_softirqs_on(ip) do { } while (0) 51 # define trace_softirqs_off(ip) do { } while (0) 52 # define trace_hardirq_context(p) 0 53 # define trace_softirq_context(p) 0 54 # define trace_hardirqs_enabled(p) 0 55 # define trace_softirqs_enabled(p) 0 56 # define trace_hardirq_enter() do { } while (0) 57 # define trace_hardirq_exit() do { } while (0) 58 # define lockdep_softirq_enter() do { } while (0) 59 # define lockdep_softirq_exit() do { } while (0) 60 # define INIT_TRACE_IRQFLAGS 61 #endif 62 63 #if defined(CONFIG_IRQSOFF_TRACER) || \ 64 defined(CONFIG_PREEMPT_TRACER) 65 extern void stop_critical_timings(void); 66 extern void start_critical_timings(void); 67 #else 68 # define stop_critical_timings() do { } while (0) 69 # define start_critical_timings() do { } while (0) 70 #endif 71 72 /* 73 * Wrap the arch provided IRQ routines to provide appropriate checks. 74 */ 75 #define raw_local_irq_disable() arch_local_irq_disable() 76 #define raw_local_irq_enable() arch_local_irq_enable() 77 #define raw_local_irq_save(flags) \ 78 do { \ 79 typecheck(unsigned long, flags); \ 80 flags = arch_local_irq_save(); \ 81 } while (0) 82 #define raw_local_irq_restore(flags) \ 83 do { \ 84 typecheck(unsigned long, flags); \ 85 arch_local_irq_restore(flags); \ 86 } while (0) 87 #define raw_local_save_flags(flags) \ 88 do { \ 89 typecheck(unsigned long, flags); \ 90 flags = arch_local_save_flags(); \ 91 } while (0) 92 #define raw_irqs_disabled_flags(flags) \ 93 ({ \ 94 typecheck(unsigned long, flags); \ 95 arch_irqs_disabled_flags(flags); \ 96 }) 97 #define raw_irqs_disabled() (arch_irqs_disabled()) 98 #define raw_safe_halt() arch_safe_halt() 99 100 /* 101 * The local_irq_*() APIs are equal to the raw_local_irq*() 102 * if !TRACE_IRQFLAGS. 103 */ 104 #ifdef CONFIG_TRACE_IRQFLAGS 105 #define local_irq_enable() \ 106 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 107 #define local_irq_disable() \ 108 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 109 #define local_irq_save(flags) \ 110 do { \ 111 raw_local_irq_save(flags); \ 112 trace_hardirqs_off(); \ 113 } while (0) 114 115 116 #define local_irq_restore(flags) \ 117 do { \ 118 if (raw_irqs_disabled_flags(flags)) { \ 119 raw_local_irq_restore(flags); \ 120 trace_hardirqs_off(); \ 121 } else { \ 122 trace_hardirqs_on(); \ 123 raw_local_irq_restore(flags); \ 124 } \ 125 } while (0) 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 */ 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 safe_halt() do { raw_safe_halt(); } while (0) 144 145 #endif /* CONFIG_TRACE_IRQFLAGS */ 146 147 #define local_save_flags(flags) raw_local_save_flags(flags) 148 149 /* 150 * Some architectures don't define arch_irqs_disabled(), so even if either 151 * definition would be fine we need to use different ones for the time being 152 * to avoid build issues. 153 */ 154 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 155 #define irqs_disabled() \ 156 ({ \ 157 unsigned long _flags; \ 158 raw_local_save_flags(_flags); \ 159 raw_irqs_disabled_flags(_flags); \ 160 }) 161 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 162 #define irqs_disabled() raw_irqs_disabled() 163 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 164 165 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 166 167 #endif 168