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 <linux/cleanup.h> 17 #include <asm/irqflags.h> 18 #include <asm/percpu.h> 19 20 /* Currently lockdep_softirqs_on/off is used only by lockdep */ 21 #ifdef CONFIG_PROVE_LOCKING 22 extern void lockdep_softirqs_on(unsigned long ip); 23 extern void lockdep_softirqs_off(unsigned long ip); 24 extern void lockdep_hardirqs_on_prepare(void); 25 extern void lockdep_hardirqs_on(unsigned long ip); 26 extern void lockdep_hardirqs_off(unsigned long ip); 27 #else lockdep_softirqs_on(unsigned long ip)28 static inline void lockdep_softirqs_on(unsigned long ip) { } lockdep_softirqs_off(unsigned long ip)29 static inline void lockdep_softirqs_off(unsigned long ip) { } lockdep_hardirqs_on_prepare(void)30 static inline void lockdep_hardirqs_on_prepare(void) { } lockdep_hardirqs_on(unsigned long ip)31 static inline void lockdep_hardirqs_on(unsigned long ip) { } lockdep_hardirqs_off(unsigned long ip)32 static inline void lockdep_hardirqs_off(unsigned long ip) { } 33 #endif 34 35 #ifdef CONFIG_TRACE_IRQFLAGS 36 37 /* Per-task IRQ trace events information. */ 38 struct irqtrace_events { 39 unsigned int irq_events; 40 unsigned long hardirq_enable_ip; 41 unsigned long hardirq_disable_ip; 42 unsigned int hardirq_enable_event; 43 unsigned int hardirq_disable_event; 44 unsigned long softirq_disable_ip; 45 unsigned long softirq_enable_ip; 46 unsigned int softirq_disable_event; 47 unsigned int softirq_enable_event; 48 }; 49 50 DECLARE_PER_CPU(int, hardirqs_enabled); 51 DECLARE_PER_CPU(int, hardirq_context); 52 53 extern void trace_hardirqs_on_prepare(void); 54 extern void trace_hardirqs_off_finish(void); 55 extern void trace_hardirqs_on(void); 56 extern void trace_hardirqs_off(void); 57 58 # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context)) 59 # define lockdep_softirq_context(p) ((p)->softirq_context) 60 # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) 61 # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) 62 # define lockdep_hardirq_enter() \ 63 do { \ 64 if (__this_cpu_inc_return(hardirq_context) == 1)\ 65 current->hardirq_threaded = 0; \ 66 } while (0) 67 # define lockdep_hardirq_threaded() \ 68 do { \ 69 current->hardirq_threaded = 1; \ 70 } while (0) 71 # define lockdep_hardirq_exit() \ 72 do { \ 73 __this_cpu_dec(hardirq_context); \ 74 } while (0) 75 76 # define lockdep_hrtimer_enter(__hrtimer) \ 77 ({ \ 78 bool __expires_hardirq = true; \ 79 \ 80 if (!__hrtimer->is_hard) { \ 81 current->irq_config = 1; \ 82 __expires_hardirq = false; \ 83 } \ 84 __expires_hardirq; \ 85 }) 86 87 # define lockdep_hrtimer_exit(__expires_hardirq) \ 88 do { \ 89 if (!__expires_hardirq) \ 90 current->irq_config = 0; \ 91 } while (0) 92 93 # define lockdep_posixtimer_enter() \ 94 do { \ 95 current->irq_config = 1; \ 96 } while (0) 97 98 # define lockdep_posixtimer_exit() \ 99 do { \ 100 current->irq_config = 0; \ 101 } while (0) 102 103 # define lockdep_irq_work_enter(_flags) \ 104 do { \ 105 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ 106 current->irq_config = 1; \ 107 } while (0) 108 # define lockdep_irq_work_exit(_flags) \ 109 do { \ 110 if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ 111 current->irq_config = 0; \ 112 } while (0) 113 114 #else 115 # define trace_hardirqs_on_prepare() do { } while (0) 116 # define trace_hardirqs_off_finish() do { } while (0) 117 # define trace_hardirqs_on() do { } while (0) 118 # define trace_hardirqs_off() do { } while (0) 119 # define lockdep_hardirq_context() 0 120 # define lockdep_softirq_context(p) 0 121 # define lockdep_hardirqs_enabled() 0 122 # define lockdep_softirqs_enabled(p) 0 123 # define lockdep_hardirq_enter() do { } while (0) 124 # define lockdep_hardirq_threaded() do { } while (0) 125 # define lockdep_hardirq_exit() do { } while (0) 126 # define lockdep_softirq_enter() do { } while (0) 127 # define lockdep_softirq_exit() do { } while (0) 128 # define lockdep_hrtimer_enter(__hrtimer) false 129 # define lockdep_hrtimer_exit(__context) do { (void)(__context); } while (0) 130 # define lockdep_posixtimer_enter() do { } while (0) 131 # define lockdep_posixtimer_exit() do { } while (0) 132 # define lockdep_irq_work_enter(__work) do { } while (0) 133 # define lockdep_irq_work_exit(__work) do { } while (0) 134 #endif 135 136 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT) 137 # define lockdep_softirq_enter() \ 138 do { \ 139 current->softirq_context++; \ 140 } while (0) 141 # define lockdep_softirq_exit() \ 142 do { \ 143 current->softirq_context--; \ 144 } while (0) 145 146 #else 147 # define lockdep_softirq_enter() do { } while (0) 148 # define lockdep_softirq_exit() do { } while (0) 149 #endif 150 151 #if defined(CONFIG_IRQSOFF_TRACER) || \ 152 defined(CONFIG_PREEMPT_TRACER) 153 extern void stop_critical_timings(void); 154 extern void start_critical_timings(void); 155 #else 156 # define stop_critical_timings() do { } while (0) 157 # define start_critical_timings() do { } while (0) 158 #endif 159 160 #ifdef CONFIG_DEBUG_IRQFLAGS 161 extern void warn_bogus_irq_restore(void); 162 #define raw_check_bogus_irq_restore() \ 163 do { \ 164 if (unlikely(!arch_irqs_disabled())) \ 165 warn_bogus_irq_restore(); \ 166 } while (0) 167 #else 168 #define raw_check_bogus_irq_restore() do { } while (0) 169 #endif 170 171 /* 172 * Wrap the arch provided IRQ routines to provide appropriate checks. 173 */ 174 #define raw_local_irq_disable() arch_local_irq_disable() 175 #define raw_local_irq_enable() arch_local_irq_enable() 176 #define raw_local_irq_save(flags) \ 177 do { \ 178 typecheck(unsigned long, flags); \ 179 flags = arch_local_irq_save(); \ 180 } while (0) 181 #define raw_local_irq_restore(flags) \ 182 do { \ 183 typecheck(unsigned long, flags); \ 184 raw_check_bogus_irq_restore(); \ 185 arch_local_irq_restore(flags); \ 186 } while (0) 187 #define raw_local_save_flags(flags) \ 188 do { \ 189 typecheck(unsigned long, flags); \ 190 flags = arch_local_save_flags(); \ 191 } while (0) 192 #define raw_irqs_disabled_flags(flags) \ 193 ({ \ 194 typecheck(unsigned long, flags); \ 195 arch_irqs_disabled_flags(flags); \ 196 }) 197 #define raw_irqs_disabled() (arch_irqs_disabled()) 198 #define raw_safe_halt() arch_safe_halt() 199 200 /* 201 * The local_irq_*() APIs are equal to the raw_local_irq*() 202 * if !TRACE_IRQFLAGS. 203 */ 204 #ifdef CONFIG_TRACE_IRQFLAGS 205 206 #define local_irq_enable() \ 207 do { \ 208 trace_hardirqs_on(); \ 209 raw_local_irq_enable(); \ 210 } while (0) 211 212 #define local_irq_disable() \ 213 do { \ 214 bool was_disabled = raw_irqs_disabled();\ 215 raw_local_irq_disable(); \ 216 if (!was_disabled) \ 217 trace_hardirqs_off(); \ 218 } while (0) 219 220 #define local_irq_save(flags) \ 221 do { \ 222 raw_local_irq_save(flags); \ 223 if (!raw_irqs_disabled_flags(flags)) \ 224 trace_hardirqs_off(); \ 225 } while (0) 226 227 #define local_irq_restore(flags) \ 228 do { \ 229 if (!raw_irqs_disabled_flags(flags)) \ 230 trace_hardirqs_on(); \ 231 raw_local_irq_restore(flags); \ 232 } while (0) 233 234 #define safe_halt() \ 235 do { \ 236 trace_hardirqs_on(); \ 237 raw_safe_halt(); \ 238 } while (0) 239 240 241 #else /* !CONFIG_TRACE_IRQFLAGS */ 242 243 #define local_irq_enable() do { raw_local_irq_enable(); } while (0) 244 #define local_irq_disable() do { raw_local_irq_disable(); } while (0) 245 #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) 246 #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) 247 #define safe_halt() do { raw_safe_halt(); } while (0) 248 249 #endif /* CONFIG_TRACE_IRQFLAGS */ 250 251 #define local_save_flags(flags) raw_local_save_flags(flags) 252 253 /* 254 * Some architectures don't define arch_irqs_disabled(), so even if either 255 * definition would be fine we need to use different ones for the time being 256 * to avoid build issues. 257 */ 258 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT 259 #define irqs_disabled() \ 260 ({ \ 261 unsigned long _flags; \ 262 raw_local_save_flags(_flags); \ 263 raw_irqs_disabled_flags(_flags); \ 264 }) 265 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ 266 #define irqs_disabled() raw_irqs_disabled() 267 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ 268 269 #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) 270 271 DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), local_irq_enable()) 272 DEFINE_LOCK_GUARD_0(irqsave, 273 local_irq_save(_T->flags), 274 local_irq_restore(_T->flags), 275 unsigned long flags) 276 277 #endif 278