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 # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, 44 #else 45 # define trace_hardirqs_on() do { } while (0) 46 # define trace_hardirqs_off() do { } while (0) 47 # define trace_softirqs_on(ip) do { } while (0) 48 # define trace_softirqs_off(ip) do { } while (0) 49 # define trace_hardirq_context(p) 0 50 # define trace_softirq_context(p) 0 51 # define trace_hardirqs_enabled(p) 0 52 # define trace_softirqs_enabled(p) 0 53 # define trace_hardirq_enter() do { } while (0) 54 # define trace_hardirq_exit() do { } while (0) 55 # define lockdep_softirq_enter() do { } while (0) 56 # define lockdep_softirq_exit() do { } while (0) 57 # define INIT_TRACE_IRQFLAGS 58 #endif 59 60 #if defined(CONFIG_IRQSOFF_TRACER) || \ 61 defined(CONFIG_PREEMPT_TRACER) 62 extern void stop_critical_timings(void); 63 extern void start_critical_timings(void); 64 #else 65 # define stop_critical_timings() do { } while (0) 66 # define start_critical_timings() do { } while (0) 67 #endif 68 69 /* 70 * Wrap the arch provided IRQ routines to provide appropriate checks. 71 */ 72 #define raw_local_irq_disable() arch_local_irq_disable() 73 #define raw_local_irq_enable() arch_local_irq_enable() 74 #define raw_local_irq_save(flags) \ 75 do { \ 76 typecheck(unsigned long, flags); \ 77 flags = arch_local_irq_save(); \ 78 } while (0) 79 #define raw_local_irq_restore(flags) \ 80 do { \ 81 typecheck(unsigned long, flags); \ 82 arch_local_irq_restore(flags); \ 83 } while (0) 84 #define raw_local_save_flags(flags) \ 85 do { \ 86 typecheck(unsigned long, flags); \ 87 flags = arch_local_save_flags(); \ 88 } while (0) 89 #define raw_irqs_disabled_flags(flags) \ 90 ({ \ 91 typecheck(unsigned long, flags); \ 92 arch_irqs_disabled_flags(flags); \ 93 }) 94 #define raw_irqs_disabled() (arch_irqs_disabled()) 95 #define raw_safe_halt() arch_safe_halt() 96 97 /* 98 * The local_irq_*() APIs are equal to the raw_local_irq*() 99 * if !TRACE_IRQFLAGS. 100 */ 101 #ifdef CONFIG_TRACE_IRQFLAGS 102 #define local_irq_enable() \ 103 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 104 #define local_irq_disable() \ 105 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 106 #define local_irq_save(flags) \ 107 do { \ 108 raw_local_irq_save(flags); \ 109 trace_hardirqs_off(); \ 110 } while (0) 111 112 113 #define local_irq_restore(flags) \ 114 do { \ 115 if (raw_irqs_disabled_flags(flags)) { \ 116 raw_local_irq_restore(flags); \ 117 trace_hardirqs_off(); \ 118 } else { \ 119 trace_hardirqs_on(); \ 120 raw_local_irq_restore(flags); \ 121 } \ 122 } while (0) 123 124 #define safe_halt() \ 125 do { \ 126 trace_hardirqs_on(); \ 127 raw_safe_halt(); \ 128 } while (0) 129 130 131 #else /* !CONFIG_TRACE_IRQFLAGS */ 132 133 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 134 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 135 #define local_irq_save(flags) \ 136 do { \ 137 raw_local_irq_save(flags); \ 138 } while (0) 139 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 140 #define safe_halt() do { raw_safe_halt(); } while (0) 141 142 #endif /* CONFIG_TRACE_IRQFLAGS */ 143 144 #define local_save_flags(flags) raw_local_save_flags(flags) 145 146 /* 147 * Some architectures don't define arch_irqs_disabled(), so even if either 148 * definition would be fine we need to use different ones for the time being 149 * to avoid build issues. 150 */ 151 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 152 #define irqs_disabled() \ 153 ({ \ 154 unsigned long _flags; \ 155 raw_local_save_flags(_flags); \ 156 raw_irqs_disabled_flags(_flags); \ 157 }) 158 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 159 #define irqs_disabled() raw_irqs_disabled() 160 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 161 162 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 163 164 #endif 165