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 #include <asm/percpu.h> 18 19 /* Currently lockdep_softirqs_on/off is used only by lockdep */ 20 #ifdef CONFIG_PROVE_LOCKING 21 extern void lockdep_softirqs_on(unsigned long ip); 22 extern void lockdep_softirqs_off(unsigned long ip); 23 extern void lockdep_hardirqs_on_prepare(unsigned long ip); 24 extern void lockdep_hardirqs_on(unsigned long ip); 25 extern void lockdep_hardirqs_off(unsigned long ip); 26 #else 27 static inline void lockdep_softirqs_on(unsigned long ip) { } 28 static inline void lockdep_softirqs_off(unsigned long ip) { } 29 static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { } 30 static inline void lockdep_hardirqs_on(unsigned long ip) { } 31 static inline void lockdep_hardirqs_off(unsigned long ip) { } 32 #endif 33 34 #ifdef CONFIG_TRACE_IRQFLAGS 35 36 /* Per-task IRQ trace events information. */ 37 struct irqtrace_events { 38 unsigned int irq_events; 39 unsigned long hardirq_enable_ip; 40 unsigned long hardirq_disable_ip; 41 unsigned int hardirq_enable_event; 42 unsigned int hardirq_disable_event; 43 unsigned long softirq_disable_ip; 44 unsigned long softirq_enable_ip; 45 unsigned int softirq_disable_event; 46 unsigned int softirq_enable_event; 47 }; 48 49 DECLARE_PER_CPU(int, hardirqs_enabled); 50 DECLARE_PER_CPU(int, hardirq_context); 51 52 extern void trace_hardirqs_on_prepare(void); 53 extern void trace_hardirqs_off_finish(void); 54 extern void trace_hardirqs_on(void); 55 extern void trace_hardirqs_off(void); 56 # define lockdep_hardirq_context() (this_cpu_read(hardirq_context)) 57 # define lockdep_softirq_context(p) ((p)->softirq_context) 58 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) 59 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) 60 # define lockdep_hardirq_enter() \ 61 do { \ 62 if (this_cpu_inc_return(hardirq_context) == 1) \ 63 current->hardirq_threaded = 0; \ 64 } while (0) 65 # define lockdep_hardirq_threaded() \ 66 do { \ 67 current->hardirq_threaded = 1; \ 68 } while (0) 69 # define lockdep_hardirq_exit() \ 70 do { \ 71 this_cpu_dec(hardirq_context); \ 72 } while (0) 73 # define lockdep_softirq_enter() \ 74 do { \ 75 current->softirq_context++; \ 76 } while (0) 77 # define lockdep_softirq_exit() \ 78 do { \ 79 current->softirq_context--; \ 80 } while (0) 81 82 # define lockdep_hrtimer_enter(__hrtimer) \ 83 ({ \ 84 bool __expires_hardirq = true; \ 85 \ 86 if (!__hrtimer->is_hard) { \ 87 current->irq_config = 1; \ 88 __expires_hardirq = false; \ 89 } \ 90 __expires_hardirq; \ 91 }) 92 93 # define lockdep_hrtimer_exit(__expires_hardirq) \ 94 do { \ 95 if (!__expires_hardirq) \ 96 current->irq_config = 0; \ 97 } while (0) 98 99 # define lockdep_posixtimer_enter() \ 100 do { \ 101 current->irq_config = 1; \ 102 } while (0) 103 104 # define lockdep_posixtimer_exit() \ 105 do { \ 106 current->irq_config = 0; \ 107 } while (0) 108 109 # define lockdep_irq_work_enter(__work) \ 110 do { \ 111 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ 112 current->irq_config = 1; \ 113 } while (0) 114 # define lockdep_irq_work_exit(__work) \ 115 do { \ 116 if (!(atomic_read(&__work->flags) & IRQ_WORK_HARD_IRQ))\ 117 current->irq_config = 0; \ 118 } while (0) 119 120 #else 121 # define trace_hardirqs_on_prepare() do { } while (0) 122 # define trace_hardirqs_off_finish() do { } while (0) 123 # define trace_hardirqs_on() do { } while (0) 124 # define trace_hardirqs_off() do { } while (0) 125 # define lockdep_hardirq_context() 0 126 # define lockdep_softirq_context(p) 0 127 # define lockdep_hardirqs_enabled() 0 128 # define lockdep_softirqs_enabled(p) 0 129 # define lockdep_hardirq_enter() do { } while (0) 130 # define lockdep_hardirq_threaded() do { } while (0) 131 # define lockdep_hardirq_exit() do { } while (0) 132 # define lockdep_softirq_enter() do { } while (0) 133 # define lockdep_softirq_exit() do { } while (0) 134 # define lockdep_hrtimer_enter(__hrtimer) false 135 # define lockdep_hrtimer_exit(__context) do { } while (0) 136 # define lockdep_posixtimer_enter() do { } while (0) 137 # define lockdep_posixtimer_exit() do { } while (0) 138 # define lockdep_irq_work_enter(__work) do { } while (0) 139 # define lockdep_irq_work_exit(__work) do { } while (0) 140 #endif 141 142 #if defined(CONFIG_IRQSOFF_TRACER) || \ 143 defined(CONFIG_PREEMPT_TRACER) 144 extern void stop_critical_timings(void); 145 extern void start_critical_timings(void); 146 #else 147 # define stop_critical_timings() do { } while (0) 148 # define start_critical_timings() do { } while (0) 149 #endif 150 151 /* 152 * Wrap the arch provided IRQ routines to provide appropriate checks. 153 */ 154 #define raw_local_irq_disable() arch_local_irq_disable() 155 #define raw_local_irq_enable() arch_local_irq_enable() 156 #define raw_local_irq_save(flags) \ 157 do { \ 158 typecheck(unsigned long, flags); \ 159 flags = arch_local_irq_save(); \ 160 } while (0) 161 #define raw_local_irq_restore(flags) \ 162 do { \ 163 typecheck(unsigned long, flags); \ 164 arch_local_irq_restore(flags); \ 165 } while (0) 166 #define raw_local_save_flags(flags) \ 167 do { \ 168 typecheck(unsigned long, flags); \ 169 flags = arch_local_save_flags(); \ 170 } while (0) 171 #define raw_irqs_disabled_flags(flags) \ 172 ({ \ 173 typecheck(unsigned long, flags); \ 174 arch_irqs_disabled_flags(flags); \ 175 }) 176 #define raw_irqs_disabled() (arch_irqs_disabled()) 177 #define raw_safe_halt() arch_safe_halt() 178 179 /* 180 * The local_irq_*() APIs are equal to the raw_local_irq*() 181 * if !TRACE_IRQFLAGS. 182 */ 183 #ifdef CONFIG_TRACE_IRQFLAGS 184 #define local_irq_enable() \ 185 do { trace_hardirqs_on(); raw_local_irq_enable(); } while (0) 186 #define local_irq_disable() \ 187 do { raw_local_irq_disable(); trace_hardirqs_off(); } while (0) 188 #define local_irq_save(flags) \ 189 do { \ 190 raw_local_irq_save(flags); \ 191 trace_hardirqs_off(); \ 192 } while (0) 193 194 195 #define local_irq_restore(flags) \ 196 do { \ 197 if (raw_irqs_disabled_flags(flags)) { \ 198 raw_local_irq_restore(flags); \ 199 trace_hardirqs_off(); \ 200 } else { \ 201 trace_hardirqs_on(); \ 202 raw_local_irq_restore(flags); \ 203 } \ 204 } while (0) 205 206 #define safe_halt() \ 207 do { \ 208 trace_hardirqs_on(); \ 209 raw_safe_halt(); \ 210 } while (0) 211 212 213 #else /* !CONFIG_TRACE_IRQFLAGS */ 214 215 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 216 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 217 #define local_irq_save(flags) \ 218 do { \ 219 raw_local_irq_save(flags); \ 220 } while (0) 221 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 222 #define safe_halt() do { raw_safe_halt(); } while (0) 223 224 #endif /* CONFIG_TRACE_IRQFLAGS */ 225 226 #define local_save_flags(flags) raw_local_save_flags(flags) 227 228 /* 229 * Some architectures don't define arch_irqs_disabled(), so even if either 230 * definition would be fine we need to use different ones for the time being 231 * to avoid build issues. 232 */ 233 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 234 #define irqs_disabled() \ 235 ({ \ 236 unsigned long _flags; \ 237 raw_local_save_flags(_flags); \ 238 raw_irqs_disabled_flags(_flags); \ 239 }) 240 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 241 #define irqs_disabled() raw_irqs_disabled() 242 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 243 244 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 245 246 #endif 247