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. */ 37struct 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 49DECLARE_PER_CPU(int, hardirqs_enabled); 50DECLARE_PER_CPU(int, hardirq_context); 51 52extern void trace_hardirqs_on_prepare(void); 53extern void trace_hardirqs_off_finish(void); 54extern void trace_hardirqs_on(void); 55extern 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() \ 62do { \ 63 if (__this_cpu_inc_return(hardirq_context) == 1)\ 64 current->hardirq_threaded = 0; \ 65} while (0) 66# define lockdep_hardirq_threaded() \ 67do { \ 68 current->hardirq_threaded = 1; \ 69} while (0) 70# define lockdep_hardirq_exit() \ 71do { \ 72 __this_cpu_dec(hardirq_context); \ 73} while (0) 74# define lockdep_softirq_enter() \ 75do { \ 76 current->softirq_context++; \ 77} while (0) 78# define lockdep_softirq_exit() \ 79do { \ 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 153extern 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