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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 | */ | |
38 | int on_each_cpu(smp_call_func_t func, void *info, int wait); | |
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 | ||
966a9671 | 56 | int smp_call_function_single_async(int cpu, call_single_data_t *csd); |
7cf64f86 | 57 | |
1da177e4 LT |
58 | #ifdef CONFIG_SMP |
59 | ||
60 | #include <linux/preempt.h> | |
61 | #include <linux/kernel.h> | |
62 | #include <linux/compiler.h> | |
63 | #include <linux/thread_info.h> | |
64 | #include <asm/smp.h> | |
1da177e4 LT |
65 | |
66 | /* | |
67 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. | |
68 | * (defined in asm header): | |
d1dedb52 | 69 | */ |
1da177e4 LT |
70 | |
71 | /* | |
72 | * stops all CPUs but the current one: | |
73 | */ | |
74 | extern void smp_send_stop(void); | |
75 | ||
76 | /* | |
77 | * sends a 'reschedule' event to another CPU: | |
78 | */ | |
79 | extern void smp_send_reschedule(int cpu); | |
80 | ||
81 | ||
82 | /* | |
83 | * Prepare machine for booting other CPUs. | |
84 | */ | |
85 | extern void smp_prepare_cpus(unsigned int max_cpus); | |
86 | ||
87 | /* | |
88 | * Bring a CPU up | |
89 | */ | |
8239c25f | 90 | extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); |
1da177e4 LT |
91 | |
92 | /* | |
93 | * Final polishing of CPUs | |
94 | */ | |
95 | extern void smp_cpus_done(unsigned int max_cpus); | |
96 | ||
97 | /* | |
98 | * Call a function on all other processors | |
99 | */ | |
3a5f65df | 100 | int smp_call_function(smp_call_func_t func, void *info, int wait); |
54b11e6d | 101 | void smp_call_function_many(const struct cpumask *mask, |
3a5f65df | 102 | smp_call_func_t func, void *info, bool wait); |
2d3854a3 | 103 | |
2ea6dec4 | 104 | int smp_call_function_any(const struct cpumask *mask, |
3a5f65df | 105 | smp_call_func_t func, void *info, int wait); |
2ea6dec4 | 106 | |
f37f435f | 107 | void kick_all_cpus_sync(void); |
c6f4459f | 108 | void wake_up_all_idle_cpus(void); |
f37f435f | 109 | |
3d442233 JA |
110 | /* |
111 | * Generic and arch helpers | |
112 | */ | |
d8ad7d11 | 113 | void __init call_function_init(void); |
3d442233 | 114 | void generic_smp_call_function_single_interrupt(void); |
9a46ad6d SL |
115 | #define generic_smp_call_function_interrupt \ |
116 | generic_smp_call_function_single_interrupt | |
a3bc0dbc | 117 | |
1da177e4 LT |
118 | /* |
119 | * Mark the boot cpu "online" so that it can call console drivers in | |
120 | * printk() and can access its per-cpu storage. | |
121 | */ | |
122 | void smp_prepare_boot_cpu(void); | |
123 | ||
ca74a6f8 | 124 | extern unsigned int setup_max_cpus; |
34db18a0 AW |
125 | extern void __init setup_nr_cpu_ids(void); |
126 | extern void __init smp_init(void); | |
ca74a6f8 | 127 | |
8ce371f9 PZ |
128 | extern int __boot_cpu_id; |
129 | ||
130 | static inline int get_boot_cpu_id(void) | |
131 | { | |
132 | return __boot_cpu_id; | |
133 | } | |
134 | ||
1da177e4 LT |
135 | #else /* !SMP */ |
136 | ||
d1dedb52 IM |
137 | static inline void smp_send_stop(void) { } |
138 | ||
1da177e4 LT |
139 | /* |
140 | * These macros fold the SMP functionality into a single CPU system | |
141 | */ | |
39c715b7 | 142 | #define raw_smp_processor_id() 0 |
3a5f65df | 143 | static inline int up_smp_call_function(smp_call_func_t func, void *info) |
3c30b06d CK |
144 | { |
145 | return 0; | |
146 | } | |
8691e5a8 | 147 | #define smp_call_function(func, info, wait) \ |
a5fbb6d1 | 148 | (up_smp_call_function(func, info)) |
3b8967d7 | 149 | |
79a88102 | 150 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c | 151 | #define smp_prepare_boot_cpu() do {} while (0) |
d2ff9118 RR |
152 | #define smp_call_function_many(mask, func, info, wait) \ |
153 | (up_smp_call_function(func, info)) | |
d8ad7d11 | 154 | static inline void call_function_init(void) { } |
2ea6dec4 RR |
155 | |
156 | static inline int | |
3a5f65df | 157 | smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, |
2ea6dec4 | 158 | void *info, int wait) |
3d442233 | 159 | { |
2ea6dec4 | 160 | return smp_call_function_single(0, func, info, wait); |
3d442233 | 161 | } |
2ea6dec4 | 162 | |
f37f435f | 163 | static inline void kick_all_cpus_sync(void) { } |
c6f4459f | 164 | static inline void wake_up_all_idle_cpus(void) { } |
f37f435f | 165 | |
30b8b006 TG |
166 | #ifdef CONFIG_UP_LATE_INIT |
167 | extern void __init up_late_init(void); | |
168 | static inline void smp_init(void) { up_late_init(); } | |
169 | #else | |
170 | static inline void smp_init(void) { } | |
171 | #endif | |
172 | ||
8ce371f9 PZ |
173 | static inline int get_boot_cpu_id(void) |
174 | { | |
175 | return 0; | |
176 | } | |
177 | ||
1da177e4 LT |
178 | #endif /* !SMP */ |
179 | ||
180 | /* | |
39c715b7 | 181 | * smp_processor_id(): get the current CPU ID. |
1da177e4 | 182 | * |
cfd8d6c0 | 183 | * if DEBUG_PREEMPT is enabled then we check whether it is |
39c715b7 IM |
184 | * used in a preemption-safe way. (smp_processor_id() is safe |
185 | * if it's used in a preemption-off critical section, or in | |
186 | * a thread that is bound to the current CPU.) | |
1da177e4 | 187 | * |
39c715b7 IM |
188 | * NOTE: raw_smp_processor_id() is for internal use only |
189 | * (smp_processor_id() is the preferred variant), but in rare | |
190 | * instances it might also be used to turn off false positives | |
191 | * (i.e. smp_processor_id() use that the debugging code reports but | |
192 | * which use for some reason is legal). Don't use this to hack around | |
193 | * the warning message, as your code might not work under PREEMPT. | |
1da177e4 | 194 | */ |
39c715b7 IM |
195 | #ifdef CONFIG_DEBUG_PREEMPT |
196 | extern unsigned int debug_smp_processor_id(void); | |
197 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 198 | #else |
39c715b7 | 199 | # define smp_processor_id() raw_smp_processor_id() |
1da177e4 LT |
200 | #endif |
201 | ||
202 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) | |
203 | #define put_cpu() preempt_enable() | |
1da177e4 | 204 | |
a146649b IM |
205 | /* |
206 | * Callback to arch code if there's nosmp or maxcpus=0 on the | |
207 | * boot command line: | |
208 | */ | |
209 | extern void arch_disable_smp_support(void); | |
210 | ||
fb37bb04 PG |
211 | extern void arch_enable_nonboot_cpus_begin(void); |
212 | extern void arch_enable_nonboot_cpus_end(void); | |
213 | ||
033ab7f8 AM |
214 | void smp_setup_processor_id(void); |
215 | ||
df8ce9d7 JG |
216 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, |
217 | bool phys); | |
218 | ||
31487f83 RW |
219 | /* SMP core functions */ |
220 | int smpcfd_prepare_cpu(unsigned int cpu); | |
221 | int smpcfd_dead_cpu(unsigned int cpu); | |
222 | int smpcfd_dying_cpu(unsigned int cpu); | |
223 | ||
1da177e4 | 224 | #endif /* __LINUX_SMP_H */ |