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 |
28 | static inline void lockdep_softirqs_on(unsigned long ip) { } |
29 | static inline void lockdep_softirqs_off(unsigned long ip) { } |
30 | static inline void lockdep_hardirqs_on_prepare(void) { } |
31 | static inline void lockdep_hardirqs_on(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 { } 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 | |