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 57 # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context)) 58 # define lockdep_softirq_context(p) ((p)->softirq_context) 59 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) 60 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) 61 # define lockdep_hardirq_enter() \ 62 do { \ 63 if (__this_cpu_inc_return(hardirq_context) == 1)\ 64 current->hardirq_threaded = 0; \ 65 } while (0) 66 # define lockdep_hardirq_threaded() \ 67 do { \ 68 current->hardirq_threaded = 1; \ 69 } while (0) 70 # define lockdep_hardirq_exit() \ 71 do { \ 72 __this_cpu_dec(hardirq_context); \ 73 } while (0) 74 75 # define lockdep_hrtimer_enter(__hrtimer) \ 76 ({ \ 77 bool __expires_hardirq = true; \ 78 \ 79 if (!__hrtimer->is_hard) { \ 80 current->irq_config = 1; \ 81 __expires_hardirq = false; \ 82 } \ 83 __expires_hardirq; \ 84 }) 85 86 # define lockdep_hrtimer_exit(__expires_hardirq) \ 87 do { \ 88 if (!__expires_hardirq) \ 89 current->irq_config = 0; \ 90 } while (0) 91 92 # define lockdep_posixtimer_enter() \ 93 do { \ 94 current->irq_config = 1; \ 95 } while (0) 96 97 # define lockdep_posixtimer_exit() \ 98 do { \ 99 current->irq_config = 0; \ 100 } while (0) 101 102 # define lockdep_irq_work_enter(_flags) \ 103 do { \ 104 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ 105 current->irq_config = 1; \ 106 } while (0) 107 # define lockdep_irq_work_exit(_flags) \ 108 do { \ 109 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ 110 current->irq_config = 0; \ 111 } while (0) 112 113 #else 114 # define trace_hardirqs_on_prepare() do { } while (0) 115 # define trace_hardirqs_off_finish() do { } while (0) 116 # define trace_hardirqs_on() do { } while (0) 117 # define trace_hardirqs_off() do { } while (0) 118 # define lockdep_hardirq_context() 0 119 # define lockdep_softirq_context(p) 0 120 # define lockdep_hardirqs_enabled() 0 121 # define lockdep_softirqs_enabled(p) 0 122 # define lockdep_hardirq_enter() do { } while (0) 123 # define lockdep_hardirq_threaded() do { } while (0) 124 # define lockdep_hardirq_exit() do { } while (0) 125 # define lockdep_softirq_enter() do { } while (0) 126 # define lockdep_softirq_exit() do { } while (0) 127 # define lockdep_hrtimer_enter(__hrtimer) false 128 # define lockdep_hrtimer_exit(__context) do { } while (0) 129 # define lockdep_posixtimer_enter() do { } while (0) 130 # define lockdep_posixtimer_exit() do { } while (0) 131 # define lockdep_irq_work_enter(__work) do { } while (0) 132 # define lockdep_irq_work_exit(__work) do { } while (0) 133 #endif 134 135 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT) 136 # define lockdep_softirq_enter() \ 137 do { \ 138 current->softirq_context++; \ 139 } while (0) 140 # define lockdep_softirq_exit() \ 141 do { \ 142 current->softirq_context--; \ 143 } while (0) 144 145 #else 146 # define lockdep_softirq_enter() do { } while (0) 147 # define lockdep_softirq_exit() do { } while (0) 148 #endif 149 150 #if defined(CONFIG_IRQSOFF_TRACER) || \ 151 defined(CONFIG_PREEMPT_TRACER) 152 extern void stop_critical_timings(void); 153 extern void start_critical_timings(void); 154 #else 155 # define stop_critical_timings() do { } while (0) 156 # define start_critical_timings() do { } while (0) 157 #endif 158 159 #ifdef CONFIG_DEBUG_IRQFLAGS 160 extern void warn_bogus_irq_restore(void); 161 #define raw_check_bogus_irq_restore() \ 162 do { \ 163 if (unlikely(!arch_irqs_disabled())) \ 164 warn_bogus_irq_restore(); \ 165 } while (0) 166 #else 167 #define raw_check_bogus_irq_restore() do { } while (0) 168 #endif 169 170 /* 171 * Wrap the arch provided IRQ routines to provide appropriate checks. 172 */ 173 #define raw_local_irq_disable() arch_local_irq_disable() 174 #define raw_local_irq_enable() arch_local_irq_enable() 175 #define raw_local_irq_save(flags) \ 176 do { \ 177 typecheck(unsigned long, flags); \ 178 flags = arch_local_irq_save(); \ 179 } while (0) 180 #define raw_local_irq_restore(flags) \ 181 do { \ 182 typecheck(unsigned long, flags); \ 183 raw_check_bogus_irq_restore(); \ 184 arch_local_irq_restore(flags); \ 185 } while (0) 186 #define raw_local_save_flags(flags) \ 187 do { \ 188 typecheck(unsigned long, flags); \ 189 flags = arch_local_save_flags(); \ 190 } while (0) 191 #define raw_irqs_disabled_flags(flags) \ 192 ({ \ 193 typecheck(unsigned long, flags); \ 194 arch_irqs_disabled_flags(flags); \ 195 }) 196 #define raw_irqs_disabled() (arch_irqs_disabled()) 197 #define raw_safe_halt() arch_safe_halt() 198 199 /* 200 * The local_irq_*() APIs are equal to the raw_local_irq*() 201 * if !TRACE_IRQFLAGS. 202 */ 203 #ifdef CONFIG_TRACE_IRQFLAGS 204 205 #define local_irq_enable() \ 206 do { \ 207 trace_hardirqs_on(); \ 208 raw_local_irq_enable(); \ 209 } while (0) 210 211 #define local_irq_disable() \ 212 do { \ 213 bool was_disabled = raw_irqs_disabled();\ 214 raw_local_irq_disable(); \ 215 if (!was_disabled) \ 216 trace_hardirqs_off(); \ 217 } while (0) 218 219 #define local_irq_save(flags) \ 220 do { \ 221 raw_local_irq_save(flags); \ 222 if (!raw_irqs_disabled_flags(flags)) \ 223 trace_hardirqs_off(); \ 224 } while (0) 225 226 #define local_irq_restore(flags) \ 227 do { \ 228 if (!raw_irqs_disabled_flags(flags)) \ 229 trace_hardirqs_on(); \ 230 raw_local_irq_restore(flags); \ 231 } while (0) 232 233 #define safe_halt() \ 234 do { \ 235 trace_hardirqs_on(); \ 236 raw_safe_halt(); \ 237 } while (0) 238 239 240 #else /* !CONFIG_TRACE_IRQFLAGS */ 241 242 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 243 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 244 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) 245 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 246 #define safe_halt() do { raw_safe_halt(); } while (0) 247 248 #endif /* CONFIG_TRACE_IRQFLAGS */ 249 250 #define local_save_flags(flags) raw_local_save_flags(flags) 251 252 /* 253 * Some architectures don't define arch_irqs_disabled(), so even if either 254 * definition would be fine we need to use different ones for the time being 255 * to avoid build issues. 256 */ 257 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 258 #define irqs_disabled() \ 259 ({ \ 260 unsigned long _flags; \ 261 raw_local_save_flags(_flags); \ 262 raw_irqs_disabled_flags(_flags); \ 263 }) 264 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 265 #define irqs_disabled() raw_irqs_disabled() 266 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 267 268 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 269 270 #endif 271