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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_SMP_H |
3 | #define __LINUX_SMP_H | |
4 | ||
5 | /* | |
6 | * Generic SMP support | |
7 | * Alan Cox. <alan@redhat.com> | |
8 | */ | |
9 | ||
79974a0e | 10 | #include <linux/errno.h> |
54514a70 | 11 | #include <linux/types.h> |
3d442233 | 12 | #include <linux/list.h> |
3d442233 | 13 | #include <linux/cpumask.h> |
04948c7f | 14 | #include <linux/init.h> |
8c4890d1 | 15 | #include <linux/smp_types.h> |
1da177e4 | 16 | |
3a5f65df | 17 | typedef void (*smp_call_func_t)(void *info); |
5671d814 | 18 | typedef bool (*smp_cond_func_t)(int cpu, void *info); |
4b44a21d | 19 | |
4b44a21d PZ |
20 | /* |
21 | * structure shares (partial) layout with struct irq_work | |
22 | */ | |
966a9671 | 23 | struct __call_single_data { |
545b8c8d | 24 | struct __call_single_node node; |
3a5f65df | 25 | smp_call_func_t func; |
3d442233 | 26 | void *info; |
3d442233 JA |
27 | }; |
28 | ||
545b8c8d PZ |
29 | #define CSD_INIT(_func, _info) \ |
30 | (struct __call_single_data){ .func = (_func), .info = (_info), } | |
31 | ||
966a9671 YH |
32 | /* Use __aligned() to avoid to use 2 cache lines for 1 csd */ |
33 | typedef struct __call_single_data call_single_data_t | |
34 | __aligned(sizeof(struct __call_single_data)); | |
35 | ||
545b8c8d PZ |
36 | #define INIT_CSD(_csd, _func, _info) \ |
37 | do { \ | |
38 | *(_csd) = CSD_INIT((_func), (_info)); \ | |
39 | } while (0) | |
40 | ||
4b44a21d PZ |
41 | /* |
42 | * Enqueue a llist_node on the call_single_queue; be very careful, read | |
43 | * flush_smp_call_function_queue() in detail. | |
44 | */ | |
45 | extern void __smp_call_single_queue(int cpu, struct llist_node *node); | |
46 | ||
e057d7ae MT |
47 | /* total number of cpus in this system (may exceed NR_CPUS) */ |
48 | extern unsigned int total_cpus; | |
49 | ||
3a5f65df DH |
50 | int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, |
51 | int wait); | |
53ce3d95 | 52 | |
a5aa5ce3 NA |
53 | void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func, |
54 | void *info, bool wait, const struct cpumask *mask); | |
55 | ||
1139aeb1 | 56 | int smp_call_function_single_async(int cpu, struct __call_single_data *csd); |
a5aa5ce3 | 57 | |
6f1f942c HY |
58 | /* |
59 | * Cpus stopping functions in panic. All have default weak definitions. | |
60 | * Architecture-dependent code may override them. | |
61 | */ | |
62 | void panic_smp_self_stop(void); | |
63 | void nmi_panic_self_stop(struct pt_regs *regs); | |
64 | void crash_smp_send_stop(void); | |
65 | ||
bff2dc42 DD |
66 | /* |
67 | * Call a function on all processors | |
68 | */ | |
a5aa5ce3 NA |
69 | static inline void on_each_cpu(smp_call_func_t func, void *info, int wait) |
70 | { | |
71 | on_each_cpu_cond_mask(NULL, func, info, wait, cpu_online_mask); | |
72 | } | |
73 | ||
74 | /** | |
75 | * on_each_cpu_mask(): Run a function on processors specified by | |
76 | * cpumask, which may include the local processor. | |
77 | * @mask: The set of cpus to run on (only runs on online subset). | |
78 | * @func: The function to run. This must be fast and non-blocking. | |
79 | * @info: An arbitrary pointer to pass to the function. | |
80 | * @wait: If true, wait (atomically) until function has completed | |
81 | * on other CPUs. | |
82 | * | |
83 | * If @wait is true, then returns once @func has returned. | |
84 | * | |
85 | * You must not call this function with disabled interrupts or from a | |
86 | * hardware interrupt handler or from a bottom half handler. The | |
87 | * exception is that it may be used during early boot while | |
88 | * early_boot_irqs_disabled is set. | |
fa688207 | 89 | */ |
a5aa5ce3 NA |
90 | static inline void on_each_cpu_mask(const struct cpumask *mask, |
91 | smp_call_func_t func, void *info, bool wait) | |
92 | { | |
93 | on_each_cpu_cond_mask(NULL, func, info, wait, mask); | |
94 | } | |
fa688207 DD |
95 | |
96 | /* | |
97 | * Call a function on each processor for which the supplied function | |
98 | * cond_func returns a positive value. This may include the local | |
a5aa5ce3 NA |
99 | * processor. May be used during early boot while early_boot_irqs_disabled is |
100 | * set. Use local_irq_save/restore() instead of local_irq_disable/enable(). | |
fa688207 | 101 | */ |
a5aa5ce3 NA |
102 | static inline void on_each_cpu_cond(smp_cond_func_t cond_func, |
103 | smp_call_func_t func, void *info, bool wait) | |
104 | { | |
105 | on_each_cpu_cond_mask(cond_func, func, info, wait, cpu_online_mask); | |
106 | } | |
7cf64f86 | 107 | |
1da177e4 LT |
108 | #ifdef CONFIG_SMP |
109 | ||
110 | #include <linux/preempt.h> | |
1da177e4 LT |
111 | #include <linux/compiler.h> |
112 | #include <linux/thread_info.h> | |
113 | #include <asm/smp.h> | |
1da177e4 LT |
114 | |
115 | /* | |
116 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. | |
117 | * (defined in asm header): | |
d1dedb52 | 118 | */ |
1da177e4 LT |
119 | |
120 | /* | |
121 | * stops all CPUs but the current one: | |
122 | */ | |
123 | extern void smp_send_stop(void); | |
124 | ||
125 | /* | |
126 | * sends a 'reschedule' event to another CPU: | |
127 | */ | |
128 | extern void smp_send_reschedule(int cpu); | |
129 | ||
130 | ||
131 | /* | |
132 | * Prepare machine for booting other CPUs. | |
133 | */ | |
134 | extern void smp_prepare_cpus(unsigned int max_cpus); | |
135 | ||
136 | /* | |
137 | * Bring a CPU up | |
138 | */ | |
8239c25f | 139 | extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); |
1da177e4 LT |
140 | |
141 | /* | |
142 | * Final polishing of CPUs | |
143 | */ | |
144 | extern void smp_cpus_done(unsigned int max_cpus); | |
145 | ||
146 | /* | |
147 | * Call a function on all other processors | |
148 | */ | |
caa75932 | 149 | void smp_call_function(smp_call_func_t func, void *info, int wait); |
54b11e6d | 150 | void smp_call_function_many(const struct cpumask *mask, |
3a5f65df | 151 | smp_call_func_t func, void *info, bool wait); |
2d3854a3 | 152 | |
2ea6dec4 | 153 | int smp_call_function_any(const struct cpumask *mask, |
3a5f65df | 154 | smp_call_func_t func, void *info, int wait); |
2ea6dec4 | 155 | |
f37f435f | 156 | void kick_all_cpus_sync(void); |
c6f4459f | 157 | void wake_up_all_idle_cpus(void); |
f37f435f | 158 | |
3d442233 JA |
159 | /* |
160 | * Generic and arch helpers | |
161 | */ | |
d8ad7d11 | 162 | void __init call_function_init(void); |
3d442233 | 163 | void generic_smp_call_function_single_interrupt(void); |
9a46ad6d SL |
164 | #define generic_smp_call_function_interrupt \ |
165 | generic_smp_call_function_single_interrupt | |
a3bc0dbc | 166 | |
1da177e4 LT |
167 | /* |
168 | * Mark the boot cpu "online" so that it can call console drivers in | |
169 | * printk() and can access its per-cpu storage. | |
170 | */ | |
171 | void smp_prepare_boot_cpu(void); | |
172 | ||
ca74a6f8 | 173 | extern unsigned int setup_max_cpus; |
34db18a0 AW |
174 | extern void __init setup_nr_cpu_ids(void); |
175 | extern void __init smp_init(void); | |
ca74a6f8 | 176 | |
8ce371f9 PZ |
177 | extern int __boot_cpu_id; |
178 | ||
179 | static inline int get_boot_cpu_id(void) | |
180 | { | |
181 | return __boot_cpu_id; | |
182 | } | |
183 | ||
1da177e4 LT |
184 | #else /* !SMP */ |
185 | ||
d1dedb52 IM |
186 | static inline void smp_send_stop(void) { } |
187 | ||
1da177e4 LT |
188 | /* |
189 | * These macros fold the SMP functionality into a single CPU system | |
190 | */ | |
39c715b7 | 191 | #define raw_smp_processor_id() 0 |
caa75932 | 192 | static inline void up_smp_call_function(smp_call_func_t func, void *info) |
3c30b06d | 193 | { |
3c30b06d | 194 | } |
8691e5a8 | 195 | #define smp_call_function(func, info, wait) \ |
a5fbb6d1 | 196 | (up_smp_call_function(func, info)) |
3b8967d7 | 197 | |
79a88102 | 198 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c | 199 | #define smp_prepare_boot_cpu() do {} while (0) |
d2ff9118 RR |
200 | #define smp_call_function_many(mask, func, info, wait) \ |
201 | (up_smp_call_function(func, info)) | |
d8ad7d11 | 202 | static inline void call_function_init(void) { } |
2ea6dec4 RR |
203 | |
204 | static inline int | |
3a5f65df | 205 | smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, |
2ea6dec4 | 206 | void *info, int wait) |
3d442233 | 207 | { |
2ea6dec4 | 208 | return smp_call_function_single(0, func, info, wait); |
3d442233 | 209 | } |
2ea6dec4 | 210 | |
f37f435f | 211 | static inline void kick_all_cpus_sync(void) { } |
c6f4459f | 212 | static inline void wake_up_all_idle_cpus(void) { } |
f37f435f | 213 | |
30b8b006 TG |
214 | #ifdef CONFIG_UP_LATE_INIT |
215 | extern void __init up_late_init(void); | |
216 | static inline void smp_init(void) { up_late_init(); } | |
217 | #else | |
218 | static inline void smp_init(void) { } | |
219 | #endif | |
220 | ||
8ce371f9 PZ |
221 | static inline int get_boot_cpu_id(void) |
222 | { | |
223 | return 0; | |
224 | } | |
225 | ||
1da177e4 LT |
226 | #endif /* !SMP */ |
227 | ||
9ed7d75b PZ |
228 | /** |
229 | * raw_processor_id() - get the current (unstable) CPU id | |
230 | * | |
231 | * For then you know what you are doing and need an unstable | |
232 | * CPU id. | |
233 | */ | |
234 | ||
235 | /** | |
236 | * smp_processor_id() - get the current (stable) CPU id | |
237 | * | |
238 | * This is the normal accessor to the CPU id and should be used | |
239 | * whenever possible. | |
240 | * | |
241 | * The CPU id is stable when: | |
1da177e4 | 242 | * |
9ed7d75b PZ |
243 | * - IRQs are disabled; |
244 | * - preemption is disabled; | |
245 | * - the task is CPU affine. | |
1da177e4 | 246 | * |
9ed7d75b PZ |
247 | * When CONFIG_DEBUG_PREEMPT; we verify these assumption and WARN |
248 | * when smp_processor_id() is used when the CPU id is not stable. | |
1da177e4 | 249 | */ |
9ed7d75b PZ |
250 | |
251 | /* | |
252 | * Allow the architecture to differentiate between a stable and unstable read. | |
253 | * For example, x86 uses an IRQ-safe asm-volatile read for the unstable but a | |
254 | * regular asm read for the stable. | |
255 | */ | |
256 | #ifndef __smp_processor_id | |
257 | #define __smp_processor_id(x) raw_smp_processor_id(x) | |
258 | #endif | |
259 | ||
39c715b7 IM |
260 | #ifdef CONFIG_DEBUG_PREEMPT |
261 | extern unsigned int debug_smp_processor_id(void); | |
262 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 263 | #else |
9ed7d75b | 264 | # define smp_processor_id() __smp_processor_id() |
1da177e4 LT |
265 | #endif |
266 | ||
9ed7d75b | 267 | #define get_cpu() ({ preempt_disable(); __smp_processor_id(); }) |
1da177e4 | 268 | #define put_cpu() preempt_enable() |
1da177e4 | 269 | |
a146649b IM |
270 | /* |
271 | * Callback to arch code if there's nosmp or maxcpus=0 on the | |
272 | * boot command line: | |
273 | */ | |
274 | extern void arch_disable_smp_support(void); | |
275 | ||
56555855 QY |
276 | extern void arch_thaw_secondary_cpus_begin(void); |
277 | extern void arch_thaw_secondary_cpus_end(void); | |
fb37bb04 | 278 | |
033ab7f8 AM |
279 | void smp_setup_processor_id(void); |
280 | ||
df8ce9d7 JG |
281 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, |
282 | bool phys); | |
283 | ||
31487f83 RW |
284 | /* SMP core functions */ |
285 | int smpcfd_prepare_cpu(unsigned int cpu); | |
286 | int smpcfd_dead_cpu(unsigned int cpu); | |
287 | int smpcfd_dying_cpu(unsigned int cpu); | |
288 | ||
1da177e4 | 289 | #endif /* __LINUX_SMP_H */ |