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/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 only by lockdep */ |
22 | #ifdef CONFIG_PROVE_LOCKING |
23 | extern void lockdep_softirqs_on(unsigned long ip); |
24 | extern void lockdep_softirqs_off(unsigned long ip); |
25 | extern void lockdep_hardirqs_on_prepare(void); |
26 | extern void lockdep_hardirqs_on(unsigned long ip); |
27 | extern void lockdep_hardirqs_off(unsigned long ip); |
28 | #else |
29 | static inline void lockdep_softirqs_on(unsigned long ip) { } |
30 | static inline void lockdep_softirqs_off(unsigned long ip) { } |
31 | static inline void lockdep_hardirqs_on_prepare(void) { } |
32 | static inline void lockdep_hardirqs_on(unsigned long ip) { } |
33 | static inline void lockdep_hardirqs_off(unsigned long ip) { } |
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_cpu_read(hardirq_context)) |
47 | # define lockdep_softirq_context(p) ((p)->softirq_context) |
48 | # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) |
49 | # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) |
50 | # define lockdep_hardirq_enter() \ |
51 | do { \ |
52 | if (__this_cpu_inc_return(hardirq_context) == 1)\ |
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_hardirq) \ |
76 | do { \ |
77 | if (!__expires_hardirq) \ |
78 | current->irq_config = 0; \ |
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_HARD_IRQ)) \ |
94 | current->irq_config = 1; \ |
95 | } while (0) |
96 | # define lockdep_irq_work_exit(_flags) \ |
97 | do { \ |
98 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
99 | current->irq_config = 0; \ |
100 | } while (0) |
101 | |
102 | #else |
103 | # define trace_hardirqs_on_prepare() do { } while (0) |
104 | # define trace_hardirqs_off_finish() do { } while (0) |
105 | # define trace_hardirqs_on() do { } while (0) |
106 | # define trace_hardirqs_off() do { } while (0) |
107 | # define lockdep_hardirq_context() 0 |
108 | # define lockdep_softirq_context(p) 0 |
109 | # define lockdep_hardirqs_enabled() 0 |
110 | # define lockdep_softirqs_enabled(p) 0 |
111 | # define lockdep_hardirq_enter() do { } while (0) |
112 | # define lockdep_hardirq_threaded() do { } while (0) |
113 | # define lockdep_hardirq_exit() do { } while (0) |
114 | # define lockdep_softirq_enter() do { } while (0) |
115 | # define lockdep_softirq_exit() do { } while (0) |
116 | # define lockdep_hrtimer_enter(__hrtimer) false |
117 | # define lockdep_hrtimer_exit(__context) do { (void)(__context); } while (0) |
118 | # define lockdep_posixtimer_enter() do { } while (0) |
119 | # define lockdep_posixtimer_exit() do { } while (0) |
120 | # define lockdep_irq_work_enter(__work) do { } while (0) |
121 | # define lockdep_irq_work_exit(__work) do { } while (0) |
122 | #endif |
123 | |
124 | #if defined(CONFIG_TRACE_IRQFLAGS) && !defined(CONFIG_PREEMPT_RT) |
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() do { } while (0) |
136 | # define lockdep_softirq_exit() do { } while (0) |
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 (0) |
145 | # define start_critical_timings() do { } while (0) |
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_disabled())) \ |
153 | warn_bogus_irq_restore(); \ |
154 | } while (0) |
155 | #else |
156 | #define raw_check_bogus_irq_restore() do { } while (0) |
157 | #endif |
158 | |
159 | /* |
160 | * Wrap the arch provided IRQ routines to provide appropriate checks. |
161 | */ |
162 | #define raw_local_irq_disable() arch_local_irq_disable() |
163 | #define raw_local_irq_enable() arch_local_irq_enable() |
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_irqs_disabled()) |
186 | #define raw_safe_halt() arch_safe_halt() |
187 | |
188 | /* |
189 | * The local_irq_*() APIs are equal to the raw_local_irq*() |
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_disabled();\ |
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(flags)) \ |
212 | trace_hardirqs_off(); \ |
213 | } while (0) |
214 | |
215 | #define local_irq_restore(flags) \ |
216 | do { \ |
217 | if (!raw_irqs_disabled_flags(flags)) \ |
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_irq_enable(); } while (0) |
232 | #define local_irq_disable() do { raw_local_irq_disable(); } while (0) |
233 | #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) |
234 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) |
235 | #define safe_halt() do { raw_safe_halt(); } while (0) |
236 | |
237 | #endif /* CONFIG_TRACE_IRQFLAGS */ |
238 | |
239 | #define local_save_flags(flags) raw_local_save_flags(flags) |
240 | |
241 | /* |
242 | * Some architectures don't define arch_irqs_disabled(), so even if either |
243 | * definition would be fine we need to use different ones for the time being |
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_disabled_flags(flags) |
258 | |
259 | DEFINE_LOCK_GUARD_0(irq, local_irq_disable(), local_irq_enable()) |
260 | DEFINE_LOCK_GUARD_0(irqsave, |
261 | local_irq_save(_T->flags), |
262 | local_irq_restore(_T->flags), |
263 | unsigned long flags) |
264 | |
265 | #endif |
266 | |