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 lockdep_softirqs_on/off is used only by lockdep */ 19 #ifdef CONFIG_PROVE_LOCKING 20 extern void lockdep_softirqs_on(unsigned long ip); 21 extern void lockdep_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 lockdep_softirqs_on(unsigned long ip) { } 26 static inline void lockdep_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 lockdep_hardirq_context(p) ((p)->hardirq_context) 35 # define lockdep_softirq_context(p) ((p)->softirq_context) 36 # define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled) 37 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) 38 # define lockdep_hardirq_enter() \ 39 do { \ 40 if (!current->hardirq_context++) \ 41 current->hardirq_threaded = 0; \ 42 } while (0) 43 # define lockdep_hardirq_threaded() \ 44 do { \ 45 current->hardirq_threaded = 1; \ 46 } while (0) 47 # define lockdep_hardirq_exit() \ 48 do { \ 49 current->hardirq_context--; \ 50 } while (0) 51 # define lockdep_softirq_enter() \ 52 do { \ 53 current->softirq_context++; \ 54 } while (0) 55 # define lockdep_softirq_exit() \ 56 do { \ 57 current->softirq_context--; \ 58 } while (0) 59 60 # define lockdep_hrtimer_enter(__hrtimer) \ 61 do { \ 62 if (!__hrtimer->is_hard) \ 63 current->irq_config = 1; \ 64 } while (0) 65 66 # define lockdep_hrtimer_exit(__hrtimer) \ 67 do { \ 68 if (!__hrtimer->is_hard) \ 69 current->irq_config = 0; \ 70 } while (0) 71 72 # define lockdep_posixtimer_enter() \ 73 do { \ 74 current->irq_config = 1; \ 75 } while (0) 76 77 # define lockdep_posixtimer_exit() \ 78 do { \ 79 current->irq_config = 0; \ 80 } while (0) 81 82 # define lockdep_irq_work_enter(__work) \ 83 do { \ 84 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ 85 current->irq_config = 1; \ 86 } while (0) 87 # define lockdep_irq_work_exit(__work) \ 88 do { \ 89 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ 90 current->irq_config = 0; \ 91 } while (0) 92 93 #else 94 # define trace_hardirqs_on() do { } while (0) 95 # define trace_hardirqs_off() do { } while (0) 96 # define lockdep_hardirq_context(p) 0 97 # define lockdep_softirq_context(p) 0 98 # define lockdep_hardirqs_enabled(p) 0 99 # define lockdep_softirqs_enabled(p) 0 100 # define lockdep_hardirq_enter() do { } while (0) 101 # define lockdep_hardirq_threaded() do { } while (0) 102 # define lockdep_hardirq_exit() do { } while (0) 103 # define lockdep_softirq_enter() do { } while (0) 104 # define lockdep_softirq_exit() do { } while (0) 105 # define lockdep_hrtimer_enter(__hrtimer) do { } while (0) 106 # define lockdep_hrtimer_exit(__hrtimer) do { } while (0) 107 # define lockdep_posixtimer_enter() do { } while (0) 108 # define lockdep_posixtimer_exit() do { } while (0) 109 # define lockdep_irq_work_enter(__work) do { } while (0) 110 # define lockdep_irq_work_exit(__work) do { } while (0) 111 #endif 112 113 #if defined(CONFIG_IRQSOFF_TRACER) || \ 114 defined(CONFIG_PREEMPT_TRACER) 115 extern void stop_critical_timings(void); 116 extern void start_critical_timings(void); 117 #else 118 # define stop_critical_timings() do { } while (0) 119 # define start_critical_timings() do { } while (0) 120 #endif 121 122 /* 123 * Wrap the arch provided IRQ routines to provide appropriate checks. 124 */ 125 #define raw_local_irq_disable() arch_local_irq_disable() 126 #define raw_local_irq_enable() arch_local_irq_enable() 127 #define raw_local_irq_save(flags) \ 128 do { \ 129 typecheck(unsigned long, flags); \ 130 flags = arch_local_irq_save(); \ 131 } while (0) 132 #define raw_local_irq_restore(flags) \ 133 do { \ 134 typecheck(unsigned long, flags); \ 135 arch_local_irq_restore(flags); \ 136 } while (0) 137 #define raw_local_save_flags(flags) \ 138 do { \ 139 typecheck(unsigned long, flags); \ 140 flags = arch_local_save_flags(); \ 141 } while (0) 142 #define raw_irqs_disabled_flags(flags) \ 143 ({ \ 144 typecheck(unsigned long, flags); \ 145 arch_irqs_disabled_flags(flags); \ 146 }) 147 #define raw_irqs_disabled() (arch_irqs_disabled()) 148 #define raw_safe_halt() arch_safe_halt() 149 150 /* 151 * The local_irq_*() APIs are equal to the raw_local_irq*() 152 * if !TRACE_IRQFLAGS. 153 */ 154 #ifdef CONFIG_TRACE_IRQFLAGS 155 #define local_irq_enable() \ 156 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 157 #define local_irq_disable() \ 158 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 159 #define local_irq_save(flags) \ 160 do { \ 161 raw_local_irq_save(flags); \ 162 trace_hardirqs_off(); \ 163 } while (0) 164 165 166 #define local_irq_restore(flags) \ 167 do { \ 168 if (raw_irqs_disabled_flags(flags)) { \ 169 raw_local_irq_restore(flags); \ 170 trace_hardirqs_off(); \ 171 } else { \ 172 trace_hardirqs_on(); \ 173 raw_local_irq_restore(flags); \ 174 } \ 175 } while (0) 176 177 #define safe_halt() \ 178 do { \ 179 trace_hardirqs_on(); \ 180 raw_safe_halt(); \ 181 } while (0) 182 183 184 #else /* !CONFIG_TRACE_IRQFLAGS */ 185 186 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 187 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 188 #define local_irq_save(flags) \ 189 do { \ 190 raw_local_irq_save(flags); \ 191 } while (0) 192 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 193 #define safe_halt() do { raw_safe_halt(); } while (0) 194 195 #endif /* CONFIG_TRACE_IRQFLAGS */ 196 197 #define local_save_flags(flags) raw_local_save_flags(flags) 198 199 /* 200 * Some architectures don't define arch_irqs_disabled(), so even if either 201 * definition would be fine we need to use different ones for the time being 202 * to avoid build issues. 203 */ 204 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 205 #define irqs_disabled() \ 206 ({ \ 207 unsigned long _flags; \ 208 raw_local_save_flags(_flags); \ 209 raw_irqs_disabled_flags(_flags); \ 210 }) 211 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 212 #define irqs_disabled() raw_irqs_disabled() 213 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 214 215 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 216 217 #endif 218