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 #ifdef CONFIG_TRACE_IRQFLAGS 19 extern void trace_softirqs_on(unsigned long ip); 20 extern void trace_softirqs_off(unsigned long ip); 21 extern void trace_hardirqs_on(void); 22 extern void trace_hardirqs_off(void); 23 # define trace_hardirq_context(p) ((p)->hardirq_context) 24 # define trace_softirq_context(p) ((p)->softirq_context) 25 # define trace_hardirqs_enabled(p) ((p)->hardirqs_enabled) 26 # define trace_softirqs_enabled(p) ((p)->softirqs_enabled) 27 # define trace_hardirq_enter() \ 28 do { \ 29 current->hardirq_context++; \ 30 } while (0) 31 # define trace_hardirq_exit() \ 32 do { \ 33 current->hardirq_context--; \ 34 } while (0) 35 # define lockdep_softirq_enter() \ 36 do { \ 37 current->softirq_context++; \ 38 } while (0) 39 # define lockdep_softirq_exit() \ 40 do { \ 41 current->softirq_context--; \ 42 } while (0) 43 #else 44 # define trace_hardirqs_on() do { } while (0) 45 # define trace_hardirqs_off() do { } while (0) 46 # define trace_softirqs_on(ip) do { } while (0) 47 # define trace_softirqs_off(ip) do { } while (0) 48 # define trace_hardirq_context(p) 0 49 # define trace_softirq_context(p) 0 50 # define trace_hardirqs_enabled(p) 0 51 # define trace_softirqs_enabled(p) 0 52 # define trace_hardirq_enter() do { } while (0) 53 # define trace_hardirq_exit() do { } while (0) 54 # define lockdep_softirq_enter() do { } while (0) 55 # define lockdep_softirq_exit() do { } while (0) 56 #endif 57 58 #if defined(CONFIG_IRQSOFF_TRACER) || \ 59 defined(CONFIG_PREEMPT_TRACER) 60 extern void stop_critical_timings(void); 61 extern void start_critical_timings(void); 62 #else 63 # define stop_critical_timings() do { } while (0) 64 # define start_critical_timings() do { } while (0) 65 #endif 66 67 /* 68 * Wrap the arch provided IRQ routines to provide appropriate checks. 69 */ 70 #define raw_local_irq_disable() arch_local_irq_disable() 71 #define raw_local_irq_enable() arch_local_irq_enable() 72 #define raw_local_irq_save(flags) \ 73 do { \ 74 typecheck(unsigned long, flags); \ 75 flags = arch_local_irq_save(); \ 76 } while (0) 77 #define raw_local_irq_restore(flags) \ 78 do { \ 79 typecheck(unsigned long, flags); \ 80 arch_local_irq_restore(flags); \ 81 } while (0) 82 #define raw_local_save_flags(flags) \ 83 do { \ 84 typecheck(unsigned long, flags); \ 85 flags = arch_local_save_flags(); \ 86 } while (0) 87 #define raw_irqs_disabled_flags(flags) \ 88 ({ \ 89 typecheck(unsigned long, flags); \ 90 arch_irqs_disabled_flags(flags); \ 91 }) 92 #define raw_irqs_disabled() (arch_irqs_disabled()) 93 #define raw_safe_halt() arch_safe_halt() 94 95 /* 96 * The local_irq_*() APIs are equal to the raw_local_irq*() 97 * if !TRACE_IRQFLAGS. 98 */ 99 #ifdef CONFIG_TRACE_IRQFLAGS 100 #define local_irq_enable() \ 101 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 102 #define local_irq_disable() \ 103 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 104 #define local_irq_save(flags) \ 105 do { \ 106 raw_local_irq_save(flags); \ 107 trace_hardirqs_off(); \ 108 } while (0) 109 110 111 #define local_irq_restore(flags) \ 112 do { \ 113 if (raw_irqs_disabled_flags(flags)) { \ 114 raw_local_irq_restore(flags); \ 115 trace_hardirqs_off(); \ 116 } else { \ 117 trace_hardirqs_on(); \ 118 raw_local_irq_restore(flags); \ 119 } \ 120 } while (0) 121 122 #define safe_halt() \ 123 do { \ 124 trace_hardirqs_on(); \ 125 raw_safe_halt(); \ 126 } while (0) 127 128 129 #else /* !CONFIG_TRACE_IRQFLAGS */ 130 131 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 132 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 133 #define local_irq_save(flags) \ 134 do { \ 135 raw_local_irq_save(flags); \ 136 } while (0) 137 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 138 #define safe_halt() do { raw_safe_halt(); } while (0) 139 140 #endif /* CONFIG_TRACE_IRQFLAGS */ 141 142 #define local_save_flags(flags) raw_local_save_flags(flags) 143 144 /* 145 * Some architectures don't define arch_irqs_disabled(), so even if either 146 * definition would be fine we need to use different ones for the time being 147 * to avoid build issues. 148 */ 149 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 150 #define irqs_disabled() \ 151 ({ \ 152 unsigned long _flags; \ 153 raw_local_save_flags(_flags); \ 154 raw_irqs_disabled_flags(_flags); \ 155 }) 156 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 157 #define irqs_disabled() raw_irqs_disabled() 158 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 159 160 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 161 162 #endif 163