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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> |
6897fc22 | 15 | #include <linux/llist.h> |
1da177e4 | 16 | |
3a5f65df | 17 | typedef void (*smp_call_func_t)(void *info); |
966a9671 | 18 | struct __call_single_data { |
0ebeb79c | 19 | struct llist_node llist; |
3a5f65df | 20 | smp_call_func_t func; |
3d442233 | 21 | void *info; |
f4d03bd1 | 22 | unsigned int flags; |
3d442233 JA |
23 | }; |
24 | ||
966a9671 YH |
25 | /* Use __aligned() to avoid to use 2 cache lines for 1 csd */ |
26 | typedef struct __call_single_data call_single_data_t | |
27 | __aligned(sizeof(struct __call_single_data)); | |
28 | ||
e057d7ae MT |
29 | /* total number of cpus in this system (may exceed NR_CPUS) */ |
30 | extern unsigned int total_cpus; | |
31 | ||
3a5f65df DH |
32 | int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, |
33 | int wait); | |
53ce3d95 | 34 | |
bff2dc42 DD |
35 | /* |
36 | * Call a function on all processors | |
37 | */ | |
caa75932 | 38 | void on_each_cpu(smp_call_func_t func, void *info, int wait); |
bff2dc42 | 39 | |
fa688207 DD |
40 | /* |
41 | * Call a function on processors specified by mask, which might include | |
42 | * the local one. | |
43 | */ | |
44 | void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, | |
45 | void *info, bool wait); | |
46 | ||
47 | /* | |
48 | * Call a function on each processor for which the supplied function | |
49 | * cond_func returns a positive value. This may include the local | |
50 | * processor. | |
51 | */ | |
52 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), | |
53 | smp_call_func_t func, void *info, bool wait, | |
54 | gfp_t gfp_flags); | |
55 | ||
7d49b28a RR |
56 | void on_each_cpu_cond_mask(bool (*cond_func)(int cpu, void *info), |
57 | smp_call_func_t func, void *info, bool wait, | |
58 | gfp_t gfp_flags, const struct cpumask *mask); | |
59 | ||
966a9671 | 60 | int smp_call_function_single_async(int cpu, call_single_data_t *csd); |
7cf64f86 | 61 | |
1da177e4 LT |
62 | #ifdef CONFIG_SMP |
63 | ||
64 | #include <linux/preempt.h> | |
65 | #include <linux/kernel.h> | |
66 | #include <linux/compiler.h> | |
67 | #include <linux/thread_info.h> | |
68 | #include <asm/smp.h> | |
1da177e4 LT |
69 | |
70 | /* | |
71 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. | |
72 | * (defined in asm header): | |
d1dedb52 | 73 | */ |
1da177e4 LT |
74 | |
75 | /* | |
76 | * stops all CPUs but the current one: | |
77 | */ | |
78 | extern void smp_send_stop(void); | |
79 | ||
80 | /* | |
81 | * sends a 'reschedule' event to another CPU: | |
82 | */ | |
83 | extern void smp_send_reschedule(int cpu); | |
84 | ||
85 | ||
86 | /* | |
87 | * Prepare machine for booting other CPUs. | |
88 | */ | |
89 | extern void smp_prepare_cpus(unsigned int max_cpus); | |
90 | ||
91 | /* | |
92 | * Bring a CPU up | |
93 | */ | |
8239c25f | 94 | extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); |
1da177e4 LT |
95 | |
96 | /* | |
97 | * Final polishing of CPUs | |
98 | */ | |
99 | extern void smp_cpus_done(unsigned int max_cpus); | |
100 | ||
101 | /* | |
102 | * Call a function on all other processors | |
103 | */ | |
caa75932 | 104 | void smp_call_function(smp_call_func_t func, void *info, int wait); |
54b11e6d | 105 | void smp_call_function_many(const struct cpumask *mask, |
3a5f65df | 106 | smp_call_func_t func, void *info, bool wait); |
2d3854a3 | 107 | |
2ea6dec4 | 108 | int smp_call_function_any(const struct cpumask *mask, |
3a5f65df | 109 | smp_call_func_t func, void *info, int wait); |
2ea6dec4 | 110 | |
f37f435f | 111 | void kick_all_cpus_sync(void); |
c6f4459f | 112 | void wake_up_all_idle_cpus(void); |
f37f435f | 113 | |
3d442233 JA |
114 | /* |
115 | * Generic and arch helpers | |
116 | */ | |
d8ad7d11 | 117 | void __init call_function_init(void); |
3d442233 | 118 | void generic_smp_call_function_single_interrupt(void); |
9a46ad6d SL |
119 | #define generic_smp_call_function_interrupt \ |
120 | generic_smp_call_function_single_interrupt | |
a3bc0dbc | 121 | |
1da177e4 LT |
122 | /* |
123 | * Mark the boot cpu "online" so that it can call console drivers in | |
124 | * printk() and can access its per-cpu storage. | |
125 | */ | |
126 | void smp_prepare_boot_cpu(void); | |
127 | ||
ca74a6f8 | 128 | extern unsigned int setup_max_cpus; |
34db18a0 AW |
129 | extern void __init setup_nr_cpu_ids(void); |
130 | extern void __init smp_init(void); | |
ca74a6f8 | 131 | |
8ce371f9 PZ |
132 | extern int __boot_cpu_id; |
133 | ||
134 | static inline int get_boot_cpu_id(void) | |
135 | { | |
136 | return __boot_cpu_id; | |
137 | } | |
138 | ||
1da177e4 LT |
139 | #else /* !SMP */ |
140 | ||
d1dedb52 IM |
141 | static inline void smp_send_stop(void) { } |
142 | ||
1da177e4 LT |
143 | /* |
144 | * These macros fold the SMP functionality into a single CPU system | |
145 | */ | |
39c715b7 | 146 | #define raw_smp_processor_id() 0 |
caa75932 | 147 | static inline void up_smp_call_function(smp_call_func_t func, void *info) |
3c30b06d | 148 | { |
3c30b06d | 149 | } |
8691e5a8 | 150 | #define smp_call_function(func, info, wait) \ |
a5fbb6d1 | 151 | (up_smp_call_function(func, info)) |
3b8967d7 | 152 | |
79a88102 | 153 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c | 154 | #define smp_prepare_boot_cpu() do {} while (0) |
d2ff9118 RR |
155 | #define smp_call_function_many(mask, func, info, wait) \ |
156 | (up_smp_call_function(func, info)) | |
d8ad7d11 | 157 | static inline void call_function_init(void) { } |
2ea6dec4 RR |
158 | |
159 | static inline int | |
3a5f65df | 160 | smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, |
2ea6dec4 | 161 | void *info, int wait) |
3d442233 | 162 | { |
2ea6dec4 | 163 | return smp_call_function_single(0, func, info, wait); |
3d442233 | 164 | } |
2ea6dec4 | 165 | |
f37f435f | 166 | static inline void kick_all_cpus_sync(void) { } |
c6f4459f | 167 | static inline void wake_up_all_idle_cpus(void) { } |
f37f435f | 168 | |
30b8b006 TG |
169 | #ifdef CONFIG_UP_LATE_INIT |
170 | extern void __init up_late_init(void); | |
171 | static inline void smp_init(void) { up_late_init(); } | |
172 | #else | |
173 | static inline void smp_init(void) { } | |
174 | #endif | |
175 | ||
8ce371f9 PZ |
176 | static inline int get_boot_cpu_id(void) |
177 | { | |
178 | return 0; | |
179 | } | |
180 | ||
1da177e4 LT |
181 | #endif /* !SMP */ |
182 | ||
9ed7d75b PZ |
183 | /** |
184 | * raw_processor_id() - get the current (unstable) CPU id | |
185 | * | |
186 | * For then you know what you are doing and need an unstable | |
187 | * CPU id. | |
188 | */ | |
189 | ||
190 | /** | |
191 | * smp_processor_id() - get the current (stable) CPU id | |
192 | * | |
193 | * This is the normal accessor to the CPU id and should be used | |
194 | * whenever possible. | |
195 | * | |
196 | * The CPU id is stable when: | |
1da177e4 | 197 | * |
9ed7d75b PZ |
198 | * - IRQs are disabled; |
199 | * - preemption is disabled; | |
200 | * - the task is CPU affine. | |
1da177e4 | 201 | * |
9ed7d75b PZ |
202 | * When CONFIG_DEBUG_PREEMPT; we verify these assumption and WARN |
203 | * when smp_processor_id() is used when the CPU id is not stable. | |
1da177e4 | 204 | */ |
9ed7d75b PZ |
205 | |
206 | /* | |
207 | * Allow the architecture to differentiate between a stable and unstable read. | |
208 | * For example, x86 uses an IRQ-safe asm-volatile read for the unstable but a | |
209 | * regular asm read for the stable. | |
210 | */ | |
211 | #ifndef __smp_processor_id | |
212 | #define __smp_processor_id(x) raw_smp_processor_id(x) | |
213 | #endif | |
214 | ||
39c715b7 IM |
215 | #ifdef CONFIG_DEBUG_PREEMPT |
216 | extern unsigned int debug_smp_processor_id(void); | |
217 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 218 | #else |
9ed7d75b | 219 | # define smp_processor_id() __smp_processor_id() |
1da177e4 LT |
220 | #endif |
221 | ||
9ed7d75b | 222 | #define get_cpu() ({ preempt_disable(); __smp_processor_id(); }) |
1da177e4 | 223 | #define put_cpu() preempt_enable() |
1da177e4 | 224 | |
a146649b IM |
225 | /* |
226 | * Callback to arch code if there's nosmp or maxcpus=0 on the | |
227 | * boot command line: | |
228 | */ | |
229 | extern void arch_disable_smp_support(void); | |
230 | ||
fb37bb04 PG |
231 | extern void arch_enable_nonboot_cpus_begin(void); |
232 | extern void arch_enable_nonboot_cpus_end(void); | |
233 | ||
033ab7f8 AM |
234 | void smp_setup_processor_id(void); |
235 | ||
df8ce9d7 JG |
236 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, |
237 | bool phys); | |
238 | ||
31487f83 RW |
239 | /* SMP core functions */ |
240 | int smpcfd_prepare_cpu(unsigned int cpu); | |
241 | int smpcfd_dead_cpu(unsigned int cpu); | |
242 | int smpcfd_dying_cpu(unsigned int cpu); | |
243 | ||
1da177e4 | 244 | #endif /* __LINUX_SMP_H */ |