Merge drm/drm-next into drm-intel-next
[platform/kernel/linux-rpi.git] / include / linux / irqflags.h
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