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Linux/include/linux/irqflags.h

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  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 # 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 

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