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(void); 24 extern void lockdep_hardirqs_on(unsigned long ip); 25 extern void lockdep_hardirqs_off(unsigned long ip); 26 #else lockdep_softirqs_on(unsigned long ip)27 static inline void lockdep_softirqs_on(unsigned long ip) { } lockdep_softirqs_off(unsigned long ip)28 static inline void lockdep_softirqs_off(unsigned long ip) { } lockdep_hardirqs_on_prepare(void)29 static inline void lockdep_hardirqs_on_prepare(void) { } lockdep_hardirqs_on(unsigned long ip)30 static inline void lockdep_hardirqs_on(unsigned long ip) { } lockdep_hardirqs_off(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 # define lockdep_softirq_enter() \ 75 do { \ 76 current->softirq_context++; \ 77 } while (0) 78 # define lockdep_softirq_exit() \ 79 do { \ 80 current->softirq_context--; \ 81 } while (0) 82 83 # define lockdep_hrtimer_enter(__hrtimer) \ 84 ({ \ 85 bool __expires_hardirq = true; \ 86 \ 87 if (!__hrtimer->is_hard) { \ 88 current->irq_config = 1; \ 89 __expires_hardirq = false; \ 90 } \ 91 __expires_hardirq; \ 92 }) 93 94 # define lockdep_hrtimer_exit(__expires_hardirq) \ 95 do { \ 96 if (!__expires_hardirq) \ 97 current->irq_config = 0; \ 98 } while (0) 99 100 # define lockdep_posixtimer_enter() \ 101 do { \ 102 current->irq_config = 1; \ 103 } while (0) 104 105 # define lockdep_posixtimer_exit() \ 106 do { \ 107 current->irq_config = 0; \ 108 } while (0) 109 110 # define lockdep_irq_work_enter(_flags) \ 111 do { \ 112 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ 113 current->irq_config = 1; \ 114 } while (0) 115 # define lockdep_irq_work_exit(_flags) \ 116 do { \ 117 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ 118 current->irq_config = 0; \ 119 } while (0) 120 121 #else 122 # define trace_hardirqs_on_prepare() do { } while (0) 123 # define trace_hardirqs_off_finish() do { } while (0) 124 # define trace_hardirqs_on() do { } while (0) 125 # define trace_hardirqs_off() do { } while (0) 126 # define lockdep_hardirq_context() 0 127 # define lockdep_softirq_context(p) 0 128 # define lockdep_hardirqs_enabled() 0 129 # define lockdep_softirqs_enabled(p) 0 130 # define lockdep_hardirq_enter() do { } while (0) 131 # define lockdep_hardirq_threaded() do { } while (0) 132 # define lockdep_hardirq_exit() do { } while (0) 133 # define lockdep_softirq_enter() do { } while (0) 134 # define lockdep_softirq_exit() do { } while (0) 135 # define lockdep_hrtimer_enter(__hrtimer) false 136 # define lockdep_hrtimer_exit(__context) do { } while (0) 137 # define lockdep_posixtimer_enter() do { } while (0) 138 # define lockdep_posixtimer_exit() do { } while (0) 139 # define lockdep_irq_work_enter(__work) do { } while (0) 140 # define lockdep_irq_work_exit(__work) do { } while (0) 141 #endif 142 143 #if defined(CONFIG_IRQSOFF_TRACER) || \ 144 defined(CONFIG_PREEMPT_TRACER) 145 extern void stop_critical_timings(void); 146 extern void start_critical_timings(void); 147 #else 148 # define stop_critical_timings() do { } while (0) 149 # define start_critical_timings() do { } while (0) 150 #endif 151 152 #ifdef CONFIG_DEBUG_IRQFLAGS 153 extern void warn_bogus_irq_restore(void); 154 #define raw_check_bogus_irq_restore() \ 155 do { \ 156 if (unlikely(!arch_irqs_disabled())) \ 157 warn_bogus_irq_restore(); \ 158 } while (0) 159 #else 160 #define raw_check_bogus_irq_restore() do { } while (0) 161 #endif 162 163 /* 164 * Wrap the arch provided IRQ routines to provide appropriate checks. 165 */ 166 #define raw_local_irq_disable() arch_local_irq_disable() 167 #define raw_local_irq_enable() arch_local_irq_enable() 168 #define raw_local_irq_save(flags) \ 169 do { \ 170 typecheck(unsigned long, flags); \ 171 flags = arch_local_irq_save(); \ 172 } while (0) 173 #define raw_local_irq_restore(flags) \ 174 do { \ 175 typecheck(unsigned long, flags); \ 176 raw_check_bogus_irq_restore(); \ 177 arch_local_irq_restore(flags); \ 178 } while (0) 179 #define raw_local_save_flags(flags) \ 180 do { \ 181 typecheck(unsigned long, flags); \ 182 flags = arch_local_save_flags(); \ 183 } while (0) 184 #define raw_irqs_disabled_flags(flags) \ 185 ({ \ 186 typecheck(unsigned long, flags); \ 187 arch_irqs_disabled_flags(flags); \ 188 }) 189 #define raw_irqs_disabled() (arch_irqs_disabled()) 190 #define raw_safe_halt() arch_safe_halt() 191 192 /* 193 * The local_irq_*() APIs are equal to the raw_local_irq*() 194 * if !TRACE_IRQFLAGS. 195 */ 196 #ifdef CONFIG_TRACE_IRQFLAGS 197 198 #define local_irq_enable() \ 199 do { \ 200 trace_hardirqs_on(); \ 201 raw_local_irq_enable(); \ 202 } while (0) 203 204 #define local_irq_disable() \ 205 do { \ 206 bool was_disabled = raw_irqs_disabled();\ 207 raw_local_irq_disable(); \ 208 if (!was_disabled) \ 209 trace_hardirqs_off(); \ 210 } while (0) 211 212 #define local_irq_save(flags) \ 213 do { \ 214 raw_local_irq_save(flags); \ 215 if (!raw_irqs_disabled_flags(flags)) \ 216 trace_hardirqs_off(); \ 217 } while (0) 218 219 #define local_irq_restore(flags) \ 220 do { \ 221 if (!raw_irqs_disabled_flags(flags)) \ 222 trace_hardirqs_on(); \ 223 raw_local_irq_restore(flags); \ 224 } while (0) 225 226 #define safe_halt() \ 227 do { \ 228 trace_hardirqs_on(); \ 229 raw_safe_halt(); \ 230 } while (0) 231 232 233 #else /* !CONFIG_TRACE_IRQFLAGS */ 234 235 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 236 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 237 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) 238 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 239 #define safe_halt() do { raw_safe_halt(); } while (0) 240 241 #endif /* CONFIG_TRACE_IRQFLAGS */ 242 243 #define local_save_flags(flags) raw_local_save_flags(flags) 244 245 /* 246 * Some architectures don't define arch_irqs_disabled(), so even if either 247 * definition would be fine we need to use different ones for the time being 248 * to avoid build issues. 249 */ 250 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 251 #define irqs_disabled() \ 252 ({ \ 253 unsigned long _flags; \ 254 raw_local_save_flags(_flags); \ 255 raw_irqs_disabled_flags(_flags); \ 256 }) 257 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 258 #define irqs_disabled() raw_irqs_disabled() 259 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 260 261 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 262 263 #endif 264