1 /* SPDX-License-Identifier: GPL-2.0 */ 1
2 /*
3 * include/linux/irqflags.h
4 *
5 * IRQ flags tracing: follow the state of the
6 * provide callbacks for transitions between O
7 *
8 * This file gets included from lowlevel asm h
9 * wrapped versions of the local_irq_*() APIs,
10 * raw_local_irq_*() macros from the lowlevel
11 */
12 #ifndef _LINUX_TRACE_IRQFLAGS_H
13 #define _LINUX_TRACE_IRQFLAGS_H
14
15 #include <linux/irqflags_types.h>
16 #include <linux/typecheck.h>
17 #include <linux/cleanup.h>
18 #include <asm/irqflags.h>
19 #include <asm/percpu.h>
20
21 /* Currently lockdep_softirqs_on/off is used o
22 #ifdef CONFIG_PROVE_LOCKING
23 extern void lockdep_softirqs_on(unsigned lon
24 extern void lockdep_softirqs_off(unsigned lo
25 extern void lockdep_hardirqs_on_prepare(void
26 extern void lockdep_hardirqs_on(unsigned lon
27 extern void lockdep_hardirqs_off(unsigned lo
28 #else
29 static inline void lockdep_softirqs_on(unsig
30 static inline void lockdep_softirqs_off(unsi
31 static inline void lockdep_hardirqs_on_prepa
32 static inline void lockdep_hardirqs_on(unsig
33 static inline void lockdep_hardirqs_off(unsi
34 #endif
35
36 #ifdef CONFIG_TRACE_IRQFLAGS
37
38 DECLARE_PER_CPU(int, hardirqs_enabled);
39 DECLARE_PER_CPU(int, hardirq_context);
40
41 extern void trace_hardirqs_on_prepare(void);
42 extern void trace_hardirqs_off_finish(void);
43 extern void trace_hardirqs_on(void);
44 extern void trace_hardirqs_off(void);
45
46 # define lockdep_hardirq_context() (raw_c
47 # define lockdep_softirq_context(p) ((p)->
48 # define lockdep_hardirqs_enabled() (this_
49 # define lockdep_softirqs_enabled(p) ((p)->
50 # define lockdep_hardirq_enter()
51 do {
52 if (__this_cpu_inc_return(hardirq_cont
53 current->hardirq_threaded = 0;
54 } while (0)
55 # define lockdep_hardirq_threaded()
56 do {
57 current->hardirq_threaded = 1;
58 } while (0)
59 # define lockdep_hardirq_exit()
60 do {
61 __this_cpu_dec(hardirq_context);
62 } while (0)
63
64 # define lockdep_hrtimer_enter(__hrtimer)
65 ({
66 bool __expires_hardirq = true;
67
68 if (!__hrtimer->is_hard) {
69 current->irq_config = 1;
70 __expires_hardirq = false;
71 }
72 __expires_hardirq;
73 })
74
75 # define lockdep_hrtimer_exit(__expires_hardir
76 do {
77 if (!__expires_hardirq)
78 current->irq_config =
79 } while (0)
80
81 # define lockdep_posixtimer_enter()
82 do {
83 current->irq_config = 1;
84 } while (0)
85
86 # define lockdep_posixtimer_exit()
87 do {
88 current->irq_config = 0;
89 } while (0)
90
91 # define lockdep_irq_work_enter(_flags)
92 do {
93 if (!((_flags) & IRQ_WORK_HA
94 current->irq_config =
95 } while (0)
96 # define lockdep_irq_work_exit(_flags)
97 do {
98 if (!((_flags) & IRQ_WORK_HA
99 current->irq_config =
100 } while (0)
101
102 #else
103 # define trace_hardirqs_on_prepare()
104 # define trace_hardirqs_off_finish()
105 # define trace_hardirqs_on()
106 # define trace_hardirqs_off()
107 # define lockdep_hardirq_context()
108 # define lockdep_softirq_context(p)
109 # define lockdep_hardirqs_enabled()
110 # define lockdep_softirqs_enabled(p)
111 # define lockdep_hardirq_enter()
112 # define lockdep_hardirq_threaded()
113 # define lockdep_hardirq_exit()
114 # define lockdep_softirq_enter()
115 # define lockdep_softirq_exit()
116 # define lockdep_hrtimer_enter(__hrtimer)
117 # define lockdep_hrtimer_exit(__context)
118 # define lockdep_posixtimer_enter()
119 # define lockdep_posixtimer_exit()
120 # define lockdep_irq_work_enter(__work)
121 # define lockdep_irq_work_exit(__work)
122 #endif
123
124 #if defined(CONFIG_TRACE_IRQFLAGS) && !defined
125 # define lockdep_softirq_enter()
126 do {
127 current->softirq_context++;
128 } while (0)
129 # define lockdep_softirq_exit()
130 do {
131 current->softirq_context--;
132 } while (0)
133
134 #else
135 # define lockdep_softirq_enter()
136 # define lockdep_softirq_exit()
137 #endif
138
139 #if defined(CONFIG_IRQSOFF_TRACER) || \
140 defined(CONFIG_PREEMPT_TRACER)
141 extern void stop_critical_timings(void);
142 extern void start_critical_timings(void);
143 #else
144 # define stop_critical_timings() do { } while
145 # define start_critical_timings() do { } while
146 #endif
147
148 #ifdef CONFIG_DEBUG_IRQFLAGS
149 extern void warn_bogus_irq_restore(void);
150 #define raw_check_bogus_irq_restore()
151 do {
152 if (unlikely(!arch_irqs_disabl
153 warn_bogus_irq_restore
154 } while (0)
155 #else
156 #define raw_check_bogus_irq_restore() do { } w
157 #endif
158
159 /*
160 * Wrap the arch provided IRQ routines to prov
161 */
162 #define raw_local_irq_disable() arch_l
163 #define raw_local_irq_enable() arch_l
164 #define raw_local_irq_save(flags)
165 do {
166 typecheck(unsigned long, flags
167 flags = arch_local_irq_save();
168 } while (0)
169 #define raw_local_irq_restore(flags)
170 do {
171 typecheck(unsigned long, flags
172 raw_check_bogus_irq_restore();
173 arch_local_irq_restore(flags);
174 } while (0)
175 #define raw_local_save_flags(flags)
176 do {
177 typecheck(unsigned long, flags
178 flags = arch_local_save_flags(
179 } while (0)
180 #define raw_irqs_disabled_flags(flags)
181 ({
182 typecheck(unsigned long, flags
183 arch_irqs_disabled_flags(flags
184 })
185 #define raw_irqs_disabled() (arch_
186 #define raw_safe_halt() arch_s
187
188 /*
189 * The local_irq_*() APIs are equal to the raw
190 * if !TRACE_IRQFLAGS.
191 */
192 #ifdef CONFIG_TRACE_IRQFLAGS
193
194 #define local_irq_enable()
195 do {
196 trace_hardirqs_on();
197 raw_local_irq_enable();
198 } while (0)
199
200 #define local_irq_disable()
201 do {
202 bool was_disabled = raw_irqs_d
203 raw_local_irq_disable();
204 if (!was_disabled)
205 trace_hardirqs_off();
206 } while (0)
207
208 #define local_irq_save(flags)
209 do {
210 raw_local_irq_save(flags);
211 if (!raw_irqs_disabled_flags(f
212 trace_hardirqs_off();
213 } while (0)
214
215 #define local_irq_restore(flags)
216 do {
217 if (!raw_irqs_disabled_flags(f
218 trace_hardirqs_on();
219 raw_local_irq_restore(flags);
220 } while (0)
221
222 #define safe_halt()
223 do {
224 trace_hardirqs_on();
225 raw_safe_halt();
226 } while (0)
227
228
229 #else /* !CONFIG_TRACE_IRQFLAGS */
230
231 #define local_irq_enable() do { raw_local
232 #define local_irq_disable() do { raw_local
233 #define local_irq_save(flags) do { raw_local
234 #define local_irq_restore(flags) do { raw_loca
235 #define safe_halt() do { raw_safe_
236
237 #endif /* CONFIG_TRACE_IRQFLAGS */
238
239 #define local_save_flags(flags) raw_local_save
240
241 /*
242 * Some architectures don't define arch_irqs_d
243 * definition would be fine we need to use dif
244 * to avoid build issues.
245 */
246 #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT
247 #define irqs_disabled()
248 ({
249 unsigned long _flags;
250 raw_local_save_flags(_flags);
251 raw_irqs_disabled_flags(_flags
252 })
253 #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */
254 #define irqs_disabled() raw_irqs_disabled()
255 #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */
256
257 #define irqs_disabled_flags(flags) raw_irqs_di
258
259 DEFINE_LOCK_GUARD_0(irq, local_irq_disable(),
260 DEFINE_LOCK_GUARD_0(irqsave,
261 local_irq_save(_T->flags),
262 local_irq_restore(_T->flag
263 unsigned long flags)
264
265 #endif
266
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