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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 | ||
9983deb2 | 15 | #include <linux/irqflags_types.h> |
3f307891 | 16 | #include <linux/typecheck.h> |
54da6a09 | 17 | #include <linux/cleanup.h> |
df9ee292 | 18 | #include <asm/irqflags.h> |
a21ee605 | 19 | #include <asm/percpu.h> |
3f307891 | 20 | |
0d38453c | 21 | /* Currently lockdep_softirqs_on/off is used only by lockdep */ |
c3bc8fd6 | 22 | #ifdef CONFIG_PROVE_LOCKING |
0d38453c PZ |
23 | extern void lockdep_softirqs_on(unsigned long ip); |
24 | extern void lockdep_softirqs_off(unsigned long ip); | |
8b023acc | 25 | extern void lockdep_hardirqs_on_prepare(void); |
bff1b208 SRV |
26 | extern void lockdep_hardirqs_on(unsigned long ip); |
27 | extern void lockdep_hardirqs_off(unsigned long ip); | |
c3bc8fd6 | 28 | #else |
0d38453c PZ |
29 | static inline void lockdep_softirqs_on(unsigned long ip) { } |
30 | static inline void lockdep_softirqs_off(unsigned long ip) { } | |
8b023acc | 31 | static inline void lockdep_hardirqs_on_prepare(void) { } |
bff1b208 SRV |
32 | static inline void lockdep_hardirqs_on(unsigned long ip) { } |
33 | static inline void lockdep_hardirqs_off(unsigned long ip) { } | |
c3bc8fd6 JFG |
34 | #endif |
35 | ||
36 | #ifdef CONFIG_TRACE_IRQFLAGS | |
a21ee605 PZ |
37 | |
38 | DECLARE_PER_CPU(int, hardirqs_enabled); | |
39 | DECLARE_PER_CPU(int, hardirq_context); | |
40 | ||
00b0ed2d PZ |
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 | ||
fddf9055 | 46 | # define lockdep_hardirq_context() (raw_cpu_read(hardirq_context)) |
ef996916 | 47 | # define lockdep_softirq_context(p) ((p)->softirq_context) |
f9ad4a5f | 48 | # define lockdep_hardirqs_enabled() (this_cpu_read(hardirqs_enabled)) |
ef996916 | 49 | # define lockdep_softirqs_enabled(p) ((p)->softirqs_enabled) |
a21ee605 PZ |
50 | # define lockdep_hardirq_enter() \ |
51 | do { \ | |
fddf9055 | 52 | if (__this_cpu_inc_return(hardirq_context) == 1)\ |
a21ee605 | 53 | current->hardirq_threaded = 0; \ |
de8f5e4f | 54 | } while (0) |
d5f744f9 | 55 | # define lockdep_hardirq_threaded() \ |
de8f5e4f PZ |
56 | do { \ |
57 | current->hardirq_threaded = 1; \ | |
b09be676 | 58 | } while (0) |
2502ec37 | 59 | # define lockdep_hardirq_exit() \ |
b09be676 | 60 | do { \ |
fddf9055 | 61 | __this_cpu_dec(hardirq_context); \ |
b09be676 | 62 | } while (0) |
40db1739 SAS |
63 | |
64 | # define lockdep_hrtimer_enter(__hrtimer) \ | |
73d20564 SAS |
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 | }) | |
40db1739 | 74 | |
73d20564 SAS |
75 | # define lockdep_hrtimer_exit(__expires_hardirq) \ |
76 | do { \ | |
77 | if (!__expires_hardirq) \ | |
40db1739 | 78 | current->irq_config = 0; \ |
73d20564 | 79 | } while (0) |
40db1739 | 80 | |
d53f2b62 SAS |
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 | ||
2914b0ba | 91 | # define lockdep_irq_work_enter(_flags) \ |
49915ac3 | 92 | do { \ |
2914b0ba | 93 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
49915ac3 SAS |
94 | current->irq_config = 1; \ |
95 | } while (0) | |
2914b0ba | 96 | # define lockdep_irq_work_exit(_flags) \ |
49915ac3 | 97 | do { \ |
2914b0ba | 98 | if (!((_flags) & IRQ_WORK_HARD_IRQ)) \ |
49915ac3 SAS |
99 | current->irq_config = 0; \ |
100 | } while (0) | |
101 | ||
de30a2b3 | 102 | #else |
0995a5df | 103 | # define trace_hardirqs_on_prepare() do { } while (0) |
bf2b3008 | 104 | # define trace_hardirqs_off_finish() do { } while (0) |
00b0ed2d PZ |
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) | |
73d20564 | 116 | # define lockdep_hrtimer_enter(__hrtimer) false |
c1d11fc2 | 117 | # define lockdep_hrtimer_exit(__context) do { (void)(__context); } while (0) |
d53f2b62 SAS |
118 | # define lockdep_posixtimer_enter() do { } while (0) |
119 | # define lockdep_posixtimer_exit() do { } while (0) | |
49915ac3 SAS |
120 | # define lockdep_irq_work_enter(__work) do { } while (0) |
121 | # define lockdep_irq_work_exit(__work) do { } while (0) | |
de30a2b3 IM |
122 | #endif |
123 | ||
0c1d7a2c TG |
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 | ||
6cd8a4bb SR |
139 | #if defined(CONFIG_IRQSOFF_TRACER) || \ |
140 | defined(CONFIG_PREEMPT_TRACER) | |
81d68a96 SR |
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 | ||
997acaf6 MR |
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 | ||
df9ee292 DH |
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); \ | |
997acaf6 | 172 | raw_check_bogus_irq_restore(); \ |
df9ee292 DH |
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() | |
de30a2b3 | 187 | |
df9ee292 DH |
188 | /* |
189 | * The local_irq_*() APIs are equal to the raw_local_irq*() | |
190 | * if !TRACE_IRQFLAGS. | |
191 | */ | |
db2dcb4f | 192 | #ifdef CONFIG_TRACE_IRQFLAGS |
00b0ed2d PZ |
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 { \ | |
044d0d6d | 202 | bool was_disabled = raw_irqs_disabled();\ |
00b0ed2d | 203 | raw_local_irq_disable(); \ |
044d0d6d NP |
204 | if (!was_disabled) \ |
205 | trace_hardirqs_off(); \ | |
00b0ed2d PZ |
206 | } while (0) |
207 | ||
3f307891 SR |
208 | #define local_irq_save(flags) \ |
209 | do { \ | |
3f307891 | 210 | raw_local_irq_save(flags); \ |
044d0d6d NP |
211 | if (!raw_irqs_disabled_flags(flags)) \ |
212 | trace_hardirqs_off(); \ | |
3f307891 | 213 | } while (0) |
de30a2b3 | 214 | |
3f307891 SR |
215 | #define local_irq_restore(flags) \ |
216 | do { \ | |
044d0d6d | 217 | if (!raw_irqs_disabled_flags(flags)) \ |
3f307891 | 218 | trace_hardirqs_on(); \ |
044d0d6d | 219 | raw_local_irq_restore(flags); \ |
de30a2b3 | 220 | } while (0) |
df9ee292 DH |
221 | |
222 | #define safe_halt() \ | |
223 | do { \ | |
224 | trace_hardirqs_on(); \ | |
225 | raw_safe_halt(); \ | |
3f307891 | 226 | } while (0) |
de30a2b3 | 227 | |
de30a2b3 | 228 | |
db2dcb4f | 229 | #else /* !CONFIG_TRACE_IRQFLAGS */ |
df9ee292 DH |
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) | |
00b0ed2d | 233 | #define local_irq_save(flags) do { raw_local_irq_save(flags); } while (0) |
df9ee292 | 234 | #define local_irq_restore(flags) do { raw_local_irq_restore(flags); } while (0) |
df9ee292 DH |
235 | #define safe_halt() do { raw_safe_halt(); } while (0) |
236 | ||
db2dcb4f JB |
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() | |
40b1f4e5 | 255 | #endif /* CONFIG_TRACE_IRQFLAGS_SUPPORT */ |
de30a2b3 | 256 | |
db2dcb4f JB |
257 | #define irqs_disabled_flags(flags) raw_irqs_disabled_flags(flags) |
258 | ||
54da6a09 PZ |
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 | ||
de30a2b3 | 265 | #endif |