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_prepare(unsigned long ip); 23 extern void lockdep_hardirqs_on(unsigned long ip); 24 extern void lockdep_hardirqs_off(unsigned long ip); 25 #else 26 static inline void lockdep_softirqs_on(unsigned long ip) { } 27 static inline void lockdep_softirqs_off(unsigned long ip) { } 28 static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { } 29 static inline void lockdep_hardirqs_on(unsigned long ip) { } 30 static inline void lockdep_hardirqs_off(unsigned long ip) { } 31 #endif 32 33 #ifdef CONFIG_TRACE_IRQFLAGS 34 extern void trace_hardirqs_on_prepare(void); 35 extern void trace_hardirqs_off_finish(void); 36 extern void trace_hardirqs_on(void); 37 extern void trace_hardirqs_off(void); 38 # define lockdep_hardirq_context(p) ((p)->hardirq_context) 39 # define lockdep_softirq_context(p) ((p)->softirq_context) 40 # define lockdep_hardirqs_enabled(p) ((p)->hardirqs_enabled) 41 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) 42 # define lockdep_hardirq_enter() \ 43 do { \ 44 if (!current->hardirq_context++) \ 45 current->hardirq_threaded = 0; \ 46 } while (0) 47 # define lockdep_hardirq_threaded() \ 48 do { \ 49 current->hardirq_threaded = 1; \ 50 } while (0) 51 # define lockdep_hardirq_exit() \ 52 do { \ 53 current->hardirq_context--; \ 54 } while (0) 55 # define lockdep_softirq_enter() \ 56 do { \ 57 current->softirq_context++; \ 58 } while (0) 59 # define lockdep_softirq_exit() \ 60 do { \ 61 current->softirq_context--; \ 62 } while (0) 63 64 # define lockdep_hrtimer_enter(__hrtimer) \ 65 ({ \ 66 bool __expires_hardirq = true; \ 67 \ 68 if (!__hrtimer->is_hard) { \ 69 current->irq_config = 1; \ 70 __expires_hardirq = false; \ 71 } \ 72 __expires_hardirq; \ 73 }) 74 75 # define lockdep_hrtimer_exit(__expires_hardirq) \ 76 do { \ 77 if (!__expires_hardirq) \ 78 current->irq_config = 0; \ 79 } while (0) 80 81 # define lockdep_posixtimer_enter() \ 82 do { \ 83 current->irq_config = 1; \ 84 } while (0) 85 86 # define lockdep_posixtimer_exit() \ 87 do { \ 88 current->irq_config = 0; \ 89 } while (0) 90 91 # define lockdep_irq_work_enter(__work) \ 92 do { \ 93 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ 94 current->irq_config = 1; \ 95 } while (0) 96 # define lockdep_irq_work_exit(__work) \ 97 do { \ 98 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ 99 current->irq_config = 0; \ 100 } while (0) 101 102 #else 103 # define trace_hardirqs_on_prepare() do { } while (0) 104 # define trace_hardirqs_off_finish() do { } while (0) 105 # define trace_hardirqs_on() do { } while (0) 106 # define trace_hardirqs_off() do { } while (0) 107 # define lockdep_hardirq_context(p) 0 108 # define lockdep_softirq_context(p) 0 109 # define lockdep_hardirqs_enabled(p) 0 110 # define lockdep_softirqs_enabled(p) 0 111 # define lockdep_hardirq_enter() do { } while (0) 112 # define lockdep_hardirq_threaded() do { } while (0) 113 # define lockdep_hardirq_exit() do { } while (0) 114 # define lockdep_softirq_enter() do { } while (0) 115 # define lockdep_softirq_exit() do { } while (0) 116 # define lockdep_hrtimer_enter(__hrtimer) false 117 # define lockdep_hrtimer_exit(__context) do { } while (0) 118 # define lockdep_posixtimer_enter() do { } while (0) 119 # define lockdep_posixtimer_exit() do { } while (0) 120 # define lockdep_irq_work_enter(__work) do { } while (0) 121 # define lockdep_irq_work_exit(__work) do { } while (0) 122 #endif 123 124 #if defined(CONFIG_IRQSOFF_TRACER) || \ 125 defined(CONFIG_PREEMPT_TRACER) 126 extern void stop_critical_timings(void); 127 extern void start_critical_timings(void); 128 #else 129 # define stop_critical_timings() do { } while (0) 130 # define start_critical_timings() do { } while (0) 131 #endif 132 133 /* 134 * Wrap the arch provided IRQ routines to provide appropriate checks. 135 */ 136 #define raw_local_irq_disable() arch_local_irq_disable() 137 #define raw_local_irq_enable() arch_local_irq_enable() 138 #define raw_local_irq_save(flags) \ 139 do { \ 140 typecheck(unsigned long, flags); \ 141 flags = arch_local_irq_save(); \ 142 } while (0) 143 #define raw_local_irq_restore(flags) \ 144 do { \ 145 typecheck(unsigned long, flags); \ 146 arch_local_irq_restore(flags); \ 147 } while (0) 148 #define raw_local_save_flags(flags) \ 149 do { \ 150 typecheck(unsigned long, flags); \ 151 flags = arch_local_save_flags(); \ 152 } while (0) 153 #define raw_irqs_disabled_flags(flags) \ 154 ({ \ 155 typecheck(unsigned long, flags); \ 156 arch_irqs_disabled_flags(flags); \ 157 }) 158 #define raw_irqs_disabled() (arch_irqs_disabled()) 159 #define raw_safe_halt() arch_safe_halt() 160 161 /* 162 * The local_irq_*() APIs are equal to the raw_local_irq*() 163 * if !TRACE_IRQFLAGS. 164 */ 165 #ifdef CONFIG_TRACE_IRQFLAGS 166 #define local_irq_enable() \ 167 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 168 #define local_irq_disable() \ 169 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 170 #define local_irq_save(flags) \ 171 do { \ 172 raw_local_irq_save(flags); \ 173 trace_hardirqs_off(); \ 174 } while (0) 175 176 177 #define local_irq_restore(flags) \ 178 do { \ 179 if (raw_irqs_disabled_flags(flags)) { \ 180 raw_local_irq_restore(flags); \ 181 trace_hardirqs_off(); \ 182 } else { \ 183 trace_hardirqs_on(); \ 184 raw_local_irq_restore(flags); \ 185 } \ 186 } while (0) 187 188 #define safe_halt() \ 189 do { \ 190 trace_hardirqs_on(); \ 191 raw_safe_halt(); \ 192 } while (0) 193 194 195 #else /* !CONFIG_TRACE_IRQFLAGS */ 196 197 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 198 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 199 #define local_irq_save(flags) \ 200 do { \ 201 raw_local_irq_save(flags); \ 202 } while (0) 203 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 204 #define safe_halt() do { raw_safe_halt(); } while (0) 205 206 #endif /* CONFIG_TRACE_IRQFLAGS */ 207 208 #define local_save_flags(flags) raw_local_save_flags(flags) 209 210 /* 211 * Some architectures don't define arch_irqs_disabled(), so even if either 212 * definition would be fine we need to use different ones for the time being 213 * to avoid build issues. 214 */ 215 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 216 #define irqs_disabled() \ 217 ({ \ 218 unsigned long _flags; \ 219 raw_local_save_flags(_flags); \ 220 raw_irqs_disabled_flags(_flags); \ 221 }) 222 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 223 #define irqs_disabled() raw_irqs_disabled() 224 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 225 226 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 227 228 #endif 229