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 crossrelease_hist_start(XHLOCK_HARD); \ 31 } while (0) 32 # define trace_hardirq_exit() \ 33 do { \ 34 current->hardirq_context--; \ 35 crossrelease_hist_end(XHLOCK_HARD); \ 36 } while (0) 37 # define lockdep_softirq_enter() \ 38 do { \ 39 current->softirq_context++; \ 40 crossrelease_hist_start(XHLOCK_SOFT); \ 41 } while (0) 42 # define lockdep_softirq_exit() \ 43 do { \ 44 current->softirq_context--; \ 45 crossrelease_hist_end(XHLOCK_SOFT); \ 46 } while (0) 47 # define INIT_TRACE_IRQFLAGS .softirqs_enabled = 1, 48 #else 49 # define trace_hardirqs_on() do { } while (0) 50 # define trace_hardirqs_off() do { } while (0) 51 # define trace_softirqs_on(ip) do { } while (0) 52 # define trace_softirqs_off(ip) do { } while (0) 53 # define trace_hardirq_context(p) 0 54 # define trace_softirq_context(p) 0 55 # define trace_hardirqs_enabled(p) 0 56 # define trace_softirqs_enabled(p) 0 57 # define trace_hardirq_enter() do { } while (0) 58 # define trace_hardirq_exit() do { } while (0) 59 # define lockdep_softirq_enter() do { } while (0) 60 # define lockdep_softirq_exit() do { } while (0) 61 # define INIT_TRACE_IRQFLAGS 62 #endif 63 64 #if defined(CONFIG_IRQSOFF_TRACER) || \ 65 defined(CONFIG_PREEMPT_TRACER) 66 extern void stop_critical_timings(void); 67 extern void start_critical_timings(void); 68 #else 69 # define stop_critical_timings() do { } while (0) 70 # define start_critical_timings() do { } while (0) 71 #endif 72 73 /* 74 * Wrap the arch provided IRQ routines to provide appropriate checks. 75 */ 76 #define raw_local_irq_disable() arch_local_irq_disable() 77 #define raw_local_irq_enable() arch_local_irq_enable() 78 #define raw_local_irq_save(flags) \ 79 do { \ 80 typecheck(unsigned long, flags); \ 81 flags = arch_local_irq_save(); \ 82 } while (0) 83 #define raw_local_irq_restore(flags) \ 84 do { \ 85 typecheck(unsigned long, flags); \ 86 arch_local_irq_restore(flags); \ 87 } while (0) 88 #define raw_local_save_flags(flags) \ 89 do { \ 90 typecheck(unsigned long, flags); \ 91 flags = arch_local_save_flags(); \ 92 } while (0) 93 #define raw_irqs_disabled_flags(flags) \ 94 ({ \ 95 typecheck(unsigned long, flags); \ 96 arch_irqs_disabled_flags(flags); \ 97 }) 98 #define raw_irqs_disabled() (arch_irqs_disabled()) 99 #define raw_safe_halt() arch_safe_halt() 100 101 /* 102 * The local_irq_*() APIs are equal to the raw_local_irq*() 103 * if !TRACE_IRQFLAGS. 104 */ 105 #ifdef CONFIG_TRACE_IRQFLAGS 106 #define local_irq_enable() \ 107 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 108 #define local_irq_disable() \ 109 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 110 #define local_irq_save(flags) \ 111 do { \ 112 raw_local_irq_save(flags); \ 113 trace_hardirqs_off(); \ 114 } while (0) 115 116 117 #define local_irq_restore(flags) \ 118 do { \ 119 if (raw_irqs_disabled_flags(flags)) { \ 120 raw_local_irq_restore(flags); \ 121 trace_hardirqs_off(); \ 122 } else { \ 123 trace_hardirqs_on(); \ 124 raw_local_irq_restore(flags); \ 125 } \ 126 } while (0) 127 128 #define safe_halt() \ 129 do { \ 130 trace_hardirqs_on(); \ 131 raw_safe_halt(); \ 132 } while (0) 133 134 135 #else /* !CONFIG_TRACE_IRQFLAGS */ 136 137 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 138 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 139 #define local_irq_save(flags) \ 140 do { \ 141 raw_local_irq_save(flags); \ 142 } while (0) 143 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 144 #define safe_halt() do { raw_safe_halt(); } while (0) 145 146 #endif /* CONFIG_TRACE_IRQFLAGS */ 147 148 #define local_save_flags(flags) raw_local_save_flags(flags) 149 150 /* 151 * Some architectures don't define arch_irqs_disabled(), so even if either 152 * definition would be fine we need to use different ones for the time being 153 * to avoid build issues. 154 */ 155 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 156 #define irqs_disabled() \ 157 ({ \ 158 unsigned long _flags; \ 159 raw_local_save_flags(_flags); \ 160 raw_irqs_disabled_flags(_flags); \ 161 }) 162 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 163 #define irqs_disabled() raw_irqs_disabled() 164 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 165 166 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 167 168 #endif 169