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(void); |
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(void) { } |
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 | |
75 | # define lockdep_hrtimer_enter(__hrtimer) \ |
76 | ({ \ |
77 | bool __expires_hardirq = true; \ |
78 | \ |
79 | if (!__hrtimer->is_hard) { \ |
80 | current->irq_config = 1; \ |
81 | __expires_hardirq = false; \ |
82 | } \ |
83 | __expires_hardirq; \ |
84 | }) |
85 | |
86 | # define lockdep_hrtimer_exit(__expires_hardirq) \ |
87 | do { \ |
88 | if (!__expires_hardirq) \ |
89 | current->irq_config = 0; \ |
90 | } while (0) |
91 | |
92 | # define lockdep_posixtimer_enter() \ |
93 | do { \ |
94 | current->irq_config = 1; \ |
95 | } while (0) |
96 | |
97 | # define lockdep_posixtimer_exit() \ |
98 | do { \ |
99 | current->irq_config = 0; \ |
100 | } while (0) |
101 | |
102 | # define lockdep_irq_work_enter(_flags) \ |
103 | do { \ |
104 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
105 | current->irq_config = 1; \ |
106 | } while (0) |
107 | # define lockdep_irq_work_exit(_flags) \ |
108 | do { \ |
109 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
110 | current->irq_config = 0; \ |
111 | } while (0) |
112 | |
113 | #else |
114 | # define trace_hardirqs_on_prepare() do { } while (0) |
115 | # define trace_hardirqs_off_finish() do { } while (0) |
116 | # define trace_hardirqs_on() do { } while (0) |
117 | # define trace_hardirqs_off() do { } while (0) |
118 | # define lockdep_hardirq_context() 0 |
119 | # define lockdep_softirq_context(p) 0 |
120 | # define lockdep_hardirqs_enabled() 0 |
121 | # define lockdep_softirqs_enabled(p) 0 |
122 | # define lockdep_hardirq_enter() do { } while (0) |
123 | # define lockdep_hardirq_threaded() do { } while (0) |
124 | # define lockdep_hardirq_exit() do { } while (0) |
125 | # define lockdep_softirq_enter() do { } while (0) |
126 | # define lockdep_softirq_exit() do { } while (0) |
127 | # define lockdep_hrtimer_enter(__hrtimer) false |
128 | # define lockdep_hrtimer_exit(__context) do { } while (0) |
129 | # define lockdep_posixtimer_enter() do { } while (0) |
130 | # define lockdep_posixtimer_exit() do { } while (0) |
131 | # define lockdep_irq_work_enter(__work) do { } while (0) |
132 | # define lockdep_irq_work_exit(__work) do { } while (0) |
133 | #endif |
134 | |
135 | #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT) |
136 | # define lockdep_softirq_enter() \ |
137 | do { \ |
138 | current->softirq_context++; \ |
139 | } while (0) |
140 | # define lockdep_softirq_exit() \ |
141 | do { \ |
142 | current->softirq_context--; \ |
143 | } while (0) |
144 | |
145 | #else |
146 | # define lockdep_softirq_enter() do { } while (0) |
147 | # define lockdep_softirq_exit() do { } while (0) |
148 | #endif |
149 | |
150 | #if defined(CONFIG_IRQSOFF_TRACER) || \ |
151 | defined(CONFIG_PREEMPT_TRACER) |
152 | extern void stop_critical_timings(void); |
153 | extern void start_critical_timings(void); |
154 | #else |
155 | # define stop_critical_timings() do { } while (0) |
156 | # define start_critical_timings() do { } while (0) |
157 | #endif |
158 | |
159 | #ifdef CONFIG_DEBUG_IRQFLAGS |
160 | extern void warn_bogus_irq_restore(void); |
161 | #define raw_check_bogus_irq_restore() \ |
162 | do { \ |
163 | if (unlikely(!arch_irqs_disabled())) \ |
164 | warn_bogus_irq_restore(); \ |
165 | } while (0) |
166 | #else |
167 | #define raw_check_bogus_irq_restore() do { } while (0) |
168 | #endif |
169 | |
170 | /* |
171 | * Wrap the arch provided IRQ routines to provide appropriate checks. |
172 | */ |
173 | #define raw_local_irq_disable() arch_local_irq_disable() |
174 | #define raw_local_irq_enable() arch_local_irq_enable() |
175 | #define raw_local_irq_save(flags) \ |
176 | do { \ |
177 | typecheck(unsigned long, flags); \ |
178 | flags = arch_local_irq_save(); \ |
179 | } while (0) |
180 | #define raw_local_irq_restore(flags) \ |
181 | do { \ |
182 | typecheck(unsigned long, flags); \ |
183 | raw_check_bogus_irq_restore(); \ |
184 | arch_local_irq_restore(flags); \ |
185 | } while (0) |
186 | #define raw_local_save_flags(flags) \ |
187 | do { \ |
188 | typecheck(unsigned long, flags); \ |
189 | flags = arch_local_save_flags(); \ |
190 | } while (0) |
191 | #define raw_irqs_disabled_flags(flags) \ |
192 | ({ \ |
193 | typecheck(unsigned long, flags); \ |
194 | arch_irqs_disabled_flags(flags); \ |
195 | }) |
196 | #define raw_irqs_disabled() (arch_irqs_disabled()) |
197 | #define raw_safe_halt() arch_safe_halt() |
198 | |
199 | /* |
200 | * The local_irq_*() APIs are equal to the raw_local_irq*() |
201 | * if !TRACE_IRQFLAGS. |
202 | */ |
203 | #ifdef CONFIG_TRACE_IRQFLAGS |
204 | |
205 | #define local_irq_enable() \ |
206 | do { \ |
207 | trace_hardirqs_on(); \ |
208 | raw_local_irq_enable(); \ |
209 | } while (0) |
210 | |
211 | #define local_irq_disable() \ |
212 | do { \ |
213 | bool was_disabled = raw_irqs_disabled();\ |
214 | raw_local_irq_disable(); \ |
215 | if (!was_disabled) \ |
216 | trace_hardirqs_off(); \ |
217 | } while (0) |
218 | |
219 | #define local_irq_save(flags) \ |
220 | do { \ |
221 | raw_local_irq_save(flags); \ |
222 | if (!raw_irqs_disabled_flags(flags)) \ |
223 | trace_hardirqs_off(); \ |
224 | } while (0) |
225 | |
226 | #define local_irq_restore(flags) \ |
227 | do { \ |
228 | if (!raw_irqs_disabled_flags(flags)) \ |
229 | trace_hardirqs_on(); \ |
230 | raw_local_irq_restore(flags); \ |
231 | } while (0) |
232 | |
233 | #define safe_halt() \ |
234 | do { \ |
235 | trace_hardirqs_on(); \ |
236 | raw_safe_halt(); \ |
237 | } while (0) |
238 | |
239 | |
240 | #else /* !CONFIG_TRACE_IRQFLAGS */ |
241 | |
242 | #define local_irq_enable() do { raw_local_irq_enable(); } while (0) |
243 | #define local_irq_disable() do { raw_local_irq_disable(); } while (0) |
244 | #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) |
245 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) |
246 | #define safe_halt() do { raw_safe_halt(); } while (0) |
247 | |
248 | #endif /* CONFIG_TRACE_IRQFLAGS */ |
249 | |
250 | #define local_save_flags(flags) raw_local_save_flags(flags) |
251 | |
252 | /* |
253 | * Some architectures don't define arch_irqs_disabled(), so even if either |
254 | * definition would be fine we need to use different ones for the time being |
255 | * to avoid build issues. |
256 | */ |
257 | #ifdef CONFIG_TRACE_IRQFLAGS_SUPPORT |
258 | #define irqs_disabled() \ |
259 | ({ \ |
260 | unsigned long _flags; \ |
261 | raw_local_save_flags(_flags); \ |
262 | raw_irqs_disabled_flags(_flags); \ |
263 | }) |
264 | #else /* !CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
265 | #define irqs_disabled() raw_irqs_disabled() |
266 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
267 | |
268 | #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) |
269 | |
270 | #endif |
271 | |