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 ({ \ 62 bool __expires_hardirq = true; \ 63 \ 64 if (!__hrtimer->is_hard) { \ 65 current->irq_config = 1; \ 66 __expires_hardirq = false; \ 67 } \ 68 __expires_hardirq; \ 69 }) 70 71 # define lockdep_hrtimer_exit(__expires_hardirq) \ 72 do { \ 73 if (!__expires_hardirq) \ 74 current->irq_config = 0; \ 75 } while (0) 76 77 # define lockdep_posixtimer_enter() \ 78 do { \ 79 current->irq_config = 1; \ 80 } while (0) 81 82 # define lockdep_posixtimer_exit() \ 83 do { \ 84 current->irq_config = 0; \ 85 } while (0) 86 87 # define lockdep_irq_work_enter(__work) \ 88 do { \ 89 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ 90 current->irq_config = 1; \ 91 } while (0) 92 # define lockdep_irq_work_exit(__work) \ 93 do { \ 94 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ 95 current->irq_config = 0; \ 96 } while (0) 97 98 #else 99 # define trace_hardirqs_on() do { } while (0) 100 # define trace_hardirqs_off() do { } while (0) 101 # define lockdep_hardirq_context(p) 0 102 # define lockdep_softirq_context(p) 0 103 # define lockdep_hardirqs_enabled(p) 0 104 # define lockdep_softirqs_enabled(p) 0 105 # define lockdep_hardirq_enter() do { } while (0) 106 # define lockdep_hardirq_threaded() do { } while (0) 107 # define lockdep_hardirq_exit() do { } while (0) 108 # define lockdep_softirq_enter() do { } while (0) 109 # define lockdep_softirq_exit() do { } while (0) 110 # define lockdep_hrtimer_enter(__hrtimer) false 111 # define lockdep_hrtimer_exit(__context) do { } while (0) 112 # define lockdep_posixtimer_enter() do { } while (0) 113 # define lockdep_posixtimer_exit() do { } while (0) 114 # define lockdep_irq_work_enter(__work) do { } while (0) 115 # define lockdep_irq_work_exit(__work) do { } while (0) 116 #endif 117 118 #if defined(CONFIG_IRQSOFF_TRACER) || \ 119 defined(CONFIG_PREEMPT_TRACER) 120 extern void stop_critical_timings(void); 121 extern void start_critical_timings(void); 122 #else 123 # define stop_critical_timings() do { } while (0) 124 # define start_critical_timings() do { } while (0) 125 #endif 126 127 /* 128 * Wrap the arch provided IRQ routines to provide appropriate checks. 129 */ 130 #define raw_local_irq_disable() arch_local_irq_disable() 131 #define raw_local_irq_enable() arch_local_irq_enable() 132 #define raw_local_irq_save(flags) \ 133 do { \ 134 typecheck(unsigned long, flags); \ 135 flags = arch_local_irq_save(); \ 136 } while (0) 137 #define raw_local_irq_restore(flags) \ 138 do { \ 139 typecheck(unsigned long, flags); \ 140 arch_local_irq_restore(flags); \ 141 } while (0) 142 #define raw_local_save_flags(flags) \ 143 do { \ 144 typecheck(unsigned long, flags); \ 145 flags = arch_local_save_flags(); \ 146 } while (0) 147 #define raw_irqs_disabled_flags(flags) \ 148 ({ \ 149 typecheck(unsigned long, flags); \ 150 arch_irqs_disabled_flags(flags); \ 151 }) 152 #define raw_irqs_disabled() (arch_irqs_disabled()) 153 #define raw_safe_halt() arch_safe_halt() 154 155 /* 156 * The local_irq_*() APIs are equal to the raw_local_irq*() 157 * if !TRACE_IRQFLAGS. 158 */ 159 #ifdef CONFIG_TRACE_IRQFLAGS 160 #define local_irq_enable() \ 161 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 162 #define local_irq_disable() \ 163 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 164 #define local_irq_save(flags) \ 165 do { \ 166 raw_local_irq_save(flags); \ 167 trace_hardirqs_off(); \ 168 } while (0) 169 170 171 #define local_irq_restore(flags) \ 172 do { \ 173 if (raw_irqs_disabled_flags(flags)) { \ 174 raw_local_irq_restore(flags); \ 175 trace_hardirqs_off(); \ 176 } else { \ 177 trace_hardirqs_on(); \ 178 raw_local_irq_restore(flags); \ 179 } \ 180 } while (0) 181 182 #define safe_halt() \ 183 do { \ 184 trace_hardirqs_on(); \ 185 raw_safe_halt(); \ 186 } while (0) 187 188 189 #else /* !CONFIG_TRACE_IRQFLAGS */ 190 191 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 192 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 193 #define local_irq_save(flags) \ 194 do { \ 195 raw_local_irq_save(flags); \ 196 } while (0) 197 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 198 #define safe_halt() do { raw_safe_halt(); } while (0) 199 200 #endif /* CONFIG_TRACE_IRQFLAGS */ 201 202 #define local_save_flags(flags) raw_local_save_flags(flags) 203 204 /* 205 * Some architectures don't define arch_irqs_disabled(), so even if either 206 * definition would be fine we need to use different ones for the time being 207 * to avoid build issues. 208 */ 209 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 210 #define irqs_disabled() \ 211 ({ \ 212 unsigned long _flags; \ 213 raw_local_save_flags(_flags); \ 214 raw_irqs_disabled_flags(_flags); \ 215 }) 216 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 217 #define irqs_disabled() raw_irqs_disabled() 218 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 219 220 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 221 222 #endif 223