1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * include/linux/irqflags.h 4 * 5 * IRQ flags tracing: follow the state of the hardirq and softirq flags and 6 * provide callbacks for transitions between ON and OFF states. 7 * 8 * This file gets included from lowlevel asm headers too, to provide 9 * wrapped versions of the local_irq_*() APIs, based on the 10 * raw_local_irq_*() macros from the lowlevel headers. 11 */ 12 #ifndef _LINUX_TRACE_IRQFLAGS_H 13 #define _LINUX_TRACE_IRQFLAGS_H 14 15 #include <linux/typecheck.h> 16 #include <asm/irqflags.h> 17 18 /* Currently trace_softirqs_on/off is used only by lockdep */ 19 #ifdef CONFIG_PROVE_LOCKING 20 extern void trace_softirqs_on(unsigned long ip); 21 extern void trace_softirqs_off(unsigned long ip); 22 extern void lockdep_hardirqs_on(unsigned long ip); 23 extern void lockdep_hardirqs_off(unsigned long ip); 24 #else 25 static inline void trace_softirqs_on(unsigned long ip) { } 26 static inline void trace_softirqs_off(unsigned long ip) { } 27 static inline void lockdep_hardirqs_on(unsigned long ip) { } 28 static inline void lockdep_hardirqs_off(unsigned long ip) { } 29 #endif 30 31 #ifdef CONFIG_TRACE_IRQFLAGS 32 extern void trace_hardirqs_on(void); 33 extern void trace_hardirqs_off(void); 34 # define trace_hardirq_context(p) ((p)->hardirq_context) 35 # define trace_softirq_context(p) ((p)->softirq_context) 36 # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled) 37 # define trace_softirqs_enabled(p) ((p)->softirqs_enabled) 38 # define trace_hardirq_enter() \ 39 do { \ 40 current->hardirq_context++; \ 41 } while (0) 42 # define trace_hardirq_exit() \ 43 do { \ 44 current->hardirq_context--; \ 45 } while (0) 46 # define lockdep_softirq_enter() \ 47 do { \ 48 current->softirq_context++; \ 49 } while (0) 50 # define lockdep_softirq_exit() \ 51 do { \ 52 current->softirq_context--; \ 53 } while (0) 54 #else 55 # define trace_hardirqs_on() do { } while (0) 56 # define trace_hardirqs_off() do { } while (0) 57 # define trace_hardirq_context(p) 0 58 # define trace_softirq_context(p) 0 59 # define trace_hardirqs_enabled(p) 0 60 # define trace_softirqs_enabled(p) 0 61 # define trace_hardirq_enter() do { } while (0) 62 # define trace_hardirq_exit() do { } while (0) 63 # define lockdep_softirq_enter() do { } while (0) 64 # define lockdep_softirq_exit() do { } while (0) 65 #endif 66 67 #if defined(CONFIG_IRQSOFF_TRACER) || \ 68 defined(CONFIG_PREEMPT_TRACER) 69 extern void stop_critical_timings(void); 70 extern void start_critical_timings(void); 71 #else 72 # define stop_critical_timings() do { } while (0) 73 # define start_critical_timings() do { } while (0) 74 #endif 75 76 /* 77 * Wrap the arch provided IRQ routines to provide appropriate checks. 78 */ 79 #define raw_local_irq_disable() arch_local_irq_disable() 80 #define raw_local_irq_enable() arch_local_irq_enable() 81 #define raw_local_irq_save(flags) \ 82 do { \ 83 typecheck(unsigned long, flags); \ 84 flags = arch_local_irq_save(); \ 85 } while (0) 86 #define raw_local_irq_restore(flags) \ 87 do { \ 88 typecheck(unsigned long, flags); \ 89 arch_local_irq_restore(flags); \ 90 } while (0) 91 #define raw_local_save_flags(flags) \ 92 do { \ 93 typecheck(unsigned long, flags); \ 94 flags = arch_local_save_flags(); \ 95 } while (0) 96 #define raw_irqs_disabled_flags(flags) \ 97 ({ \ 98 typecheck(unsigned long, flags); \ 99 arch_irqs_disabled_flags(flags); \ 100 }) 101 #define raw_irqs_disabled() (arch_irqs_disabled()) 102 #define raw_safe_halt() arch_safe_halt() 103 104 /* 105 * The local_irq_*() APIs are equal to the raw_local_irq*() 106 * if !TRACE_IRQFLAGS. 107 */ 108 #ifdef CONFIG_TRACE_IRQFLAGS 109 #define local_irq_enable() \ 110 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 111 #define local_irq_disable() \ 112 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 113 #define local_irq_save(flags) \ 114 do { \ 115 raw_local_irq_save(flags); \ 116 trace_hardirqs_off(); \ 117 } while (0) 118 119 120 #define local_irq_restore(flags) \ 121 do { \ 122 if (raw_irqs_disabled_flags(flags)) { \ 123 raw_local_irq_restore(flags); \ 124 trace_hardirqs_off(); \ 125 } else { \ 126 trace_hardirqs_on(); \ 127 raw_local_irq_restore(flags); \ 128 } \ 129 } while (0) 130 131 #define safe_halt() \ 132 do { \ 133 trace_hardirqs_on(); \ 134 raw_safe_halt(); \ 135 } while (0) 136 137 138 #else /* !CONFIG_TRACE_IRQFLAGS */ 139 140 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 141 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 142 #define local_irq_save(flags) \ 143 do { \ 144 raw_local_irq_save(flags); \ 145 } while (0) 146 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 147 #define safe_halt() do { raw_safe_halt(); } while (0) 148 149 #endif /* CONFIG_TRACE_IRQFLAGS */ 150 151 #define local_save_flags(flags) raw_local_save_flags(flags) 152 153 /* 154 * Some architectures don't define arch_irqs_disabled(), so even if either 155 * definition would be fine we need to use different ones for the time being 156 * to avoid build issues. 157 */ 158 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 159 #define irqs_disabled() \ 160 ({ \ 161 unsigned long _flags; \ 162 raw_local_save_flags(_flags); \ 163 raw_irqs_disabled_flags(_flags); \ 164 }) 165 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 166 #define irqs_disabled() raw_irqs_disabled() 167 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 168 169 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 170 171 #endif 172