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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
de30a2b3 IM |
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 | ||
3f307891 | 15 | #include <linux/typecheck.h> |
df9ee292 | 16 | #include <asm/irqflags.h> |
a21ee605 | 17 | #include <asm/percpu.h> |
3f307891 | 18 | |
0d38453c | 19 | /* Currently lockdep_softirqs_on/off is used only by lockdep */ |
c3bc8fd6 | 20 | #ifdef CONFIG_PROVE_LOCKING |
0d38453c PZ |
21 | extern void lockdep_softirqs_on(unsigned long ip); |
22 | extern void lockdep_softirqs_off(unsigned long ip); | |
c86e9b98 | 23 | extern void lockdep_hardirqs_on_prepare(unsigned long ip); |
bff1b208 SRV |
24 | extern void lockdep_hardirqs_on(unsigned long ip); |
25 | extern void lockdep_hardirqs_off(unsigned long ip); | |
c3bc8fd6 | 26 | #else |
0d38453c PZ |
27 | static inline void lockdep_softirqs_on(unsigned long ip) { } |
28 | static inline void lockdep_softirqs_off(unsigned long ip) { } | |
c86e9b98 | 29 | static inline void lockdep_hardirqs_on_prepare(unsigned long ip) { } |
bff1b208 SRV |
30 | static inline void lockdep_hardirqs_on(unsigned long ip) { } |
31 | static inline void lockdep_hardirqs_off(unsigned long ip) { } | |
c3bc8fd6 JFG |
32 | #endif |
33 | ||
34 | #ifdef CONFIG_TRACE_IRQFLAGS | |
a21ee605 | 35 | |
0584df9c ME |
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 | ||
a21ee605 PZ |
49 | DECLARE_PER_CPU(int, hardirqs_enabled); |
50 | DECLARE_PER_CPU(int, hardirq_context); | |
51 | ||
00b0ed2d PZ |
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 | ||
fddf9055 | 57 | # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context)) |
ef996916 | 58 | # define lockdep_softirq_context(p) ((p)->softirq_context) |
f9ad4a5f | 59 | # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) |
ef996916 | 60 | # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) |
a21ee605 PZ |
61 | # define lockdep_hardirq_enter() \ |
62 | do { \ | |
fddf9055 | 63 | if (__this_cpu_inc_return(hardirq_context) == 1)\ |
a21ee605 | 64 | current->hardirq_threaded = 0; \ |
de8f5e4f | 65 | } while (0) |
d5f744f9 | 66 | # define lockdep_hardirq_threaded() \ |
de8f5e4f PZ |
67 | do { \ |
68 | current->hardirq_threaded = 1; \ | |
b09be676 | 69 | } while (0) |
2502ec37 | 70 | # define lockdep_hardirq_exit() \ |
b09be676 | 71 | do { \ |
fddf9055 | 72 | __this_cpu_dec(hardirq_context); \ |
b09be676 | 73 | } while (0) |
40db1739 SAS |
74 | |
75 | # define lockdep_hrtimer_enter(__hrtimer) \ | |
73d20564 SAS |
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 | }) | |
40db1739 | 85 | |
73d20564 SAS |
86 | # define lockdep_hrtimer_exit(__expires_hardirq) \ |
87 | do { \ | |
88 | if (!__expires_hardirq) \ | |
40db1739 | 89 | current->irq_config = 0; \ |
73d20564 | 90 | } while (0) |
40db1739 | 91 | |
d53f2b62 SAS |
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 | ||
2914b0ba | 102 | # define lockdep_irq_work_enter(_flags) \ |
49915ac3 | 103 | do { \ |
2914b0ba | 104 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
49915ac3 SAS |
105 | current->irq_config = 1; \ |
106 | } while (0) | |
2914b0ba | 107 | # define lockdep_irq_work_exit(_flags) \ |
49915ac3 | 108 | do { \ |
2914b0ba | 109 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
49915ac3 SAS |
110 | current->irq_config = 0; \ |
111 | } while (0) | |
112 | ||
de30a2b3 | 113 | #else |
0995a5df | 114 | # define trace_hardirqs_on_prepare() do { } while (0) |
bf2b3008 | 115 | # define trace_hardirqs_off_finish() do { } while (0) |
00b0ed2d PZ |
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) | |
73d20564 SAS |
127 | # define lockdep_hrtimer_enter(__hrtimer) false |
128 | # define lockdep_hrtimer_exit(__context) do { } while (0) | |
d53f2b62 SAS |
129 | # define lockdep_posixtimer_enter() do { } while (0) |
130 | # define lockdep_posixtimer_exit() do { } while (0) | |
49915ac3 SAS |
131 | # define lockdep_irq_work_enter(__work) do { } while (0) |
132 | # define lockdep_irq_work_exit(__work) do { } while (0) | |
de30a2b3 IM |
133 | #endif |
134 | ||
0c1d7a2c TG |
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 | ||
6cd8a4bb SR |
150 | #if defined(CONFIG_IRQSOFF_TRACER) || \ |
151 | defined(CONFIG_PREEMPT_TRACER) | |
81d68a96 SR |
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 | ||
997acaf6 MR |
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 | ||
df9ee292 DH |
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); \ | |
997acaf6 | 183 | raw_check_bogus_irq_restore(); \ |
df9ee292 DH |
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() | |
de30a2b3 | 198 | |
df9ee292 DH |
199 | /* |
200 | * The local_irq_*() APIs are equal to the raw_local_irq*() | |
201 | * if !TRACE_IRQFLAGS. | |
202 | */ | |
db2dcb4f | 203 | #ifdef CONFIG_TRACE_IRQFLAGS |
00b0ed2d PZ |
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 { \ | |
044d0d6d | 213 | bool was_disabled = raw_irqs_disabled();\ |
00b0ed2d | 214 | raw_local_irq_disable(); \ |
044d0d6d NP |
215 | if (!was_disabled) \ |
216 | trace_hardirqs_off(); \ | |
00b0ed2d PZ |
217 | } while (0) |
218 | ||
3f307891 SR |
219 | #define local_irq_save(flags) \ |
220 | do { \ | |
3f307891 | 221 | raw_local_irq_save(flags); \ |
044d0d6d NP |
222 | if (!raw_irqs_disabled_flags(flags)) \ |
223 | trace_hardirqs_off(); \ | |
3f307891 | 224 | } while (0) |
de30a2b3 | 225 | |
3f307891 SR |
226 | #define local_irq_restore(flags) \ |
227 | do { \ | |
044d0d6d | 228 | if (!raw_irqs_disabled_flags(flags)) \ |
3f307891 | 229 | trace_hardirqs_on(); \ |
044d0d6d | 230 | raw_local_irq_restore(flags); \ |
de30a2b3 | 231 | } while (0) |
df9ee292 DH |
232 | |
233 | #define safe_halt() \ | |
234 | do { \ | |
235 | trace_hardirqs_on(); \ | |
236 | raw_safe_halt(); \ | |
3f307891 | 237 | } while (0) |
de30a2b3 | 238 | |
de30a2b3 | 239 | |
db2dcb4f | 240 | #else /* !CONFIG_TRACE_IRQFLAGS */ |
df9ee292 DH |
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) | |
00b0ed2d | 244 | #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) |
df9ee292 | 245 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) |
df9ee292 DH |
246 | #define safe_halt() do { raw_safe_halt(); } while (0) |
247 | ||
db2dcb4f JB |
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() | |
40b1f4e5 | 266 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
de30a2b3 | 267 | |
db2dcb4f JB |
268 | #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) |
269 | ||
de30a2b3 | 270 | #endif |