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1da177e4 LT |
1 | #ifndef __LINUX_SMP_H |
2 | #define __LINUX_SMP_H | |
3 | ||
4 | /* | |
5 | * Generic SMP support | |
6 | * Alan Cox. <alan@redhat.com> | |
7 | */ | |
8 | ||
79974a0e | 9 | #include <linux/errno.h> |
54514a70 | 10 | #include <linux/types.h> |
3d442233 | 11 | #include <linux/list.h> |
3d442233 | 12 | #include <linux/cpumask.h> |
04948c7f | 13 | #include <linux/init.h> |
6897fc22 | 14 | #include <linux/llist.h> |
1da177e4 | 15 | |
3a5f65df | 16 | typedef void (*smp_call_func_t)(void *info); |
966a9671 | 17 | struct __call_single_data { |
0ebeb79c | 18 | struct llist_node llist; |
3a5f65df | 19 | smp_call_func_t func; |
3d442233 | 20 | void *info; |
f4d03bd1 | 21 | unsigned int flags; |
3d442233 JA |
22 | }; |
23 | ||
966a9671 YH |
24 | /* Use __aligned() to avoid to use 2 cache lines for 1 csd */ |
25 | typedef struct __call_single_data call_single_data_t | |
26 | __aligned(sizeof(struct __call_single_data)); | |
27 | ||
e057d7ae MT |
28 | /* total number of cpus in this system (may exceed NR_CPUS) */ |
29 | extern unsigned int total_cpus; | |
30 | ||
3a5f65df DH |
31 | int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, |
32 | int wait); | |
53ce3d95 | 33 | |
bff2dc42 DD |
34 | /* |
35 | * Call a function on all processors | |
36 | */ | |
37 | int on_each_cpu(smp_call_func_t func, void *info, int wait); | |
38 | ||
fa688207 DD |
39 | /* |
40 | * Call a function on processors specified by mask, which might include | |
41 | * the local one. | |
42 | */ | |
43 | void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, | |
44 | void *info, bool wait); | |
45 | ||
46 | /* | |
47 | * Call a function on each processor for which the supplied function | |
48 | * cond_func returns a positive value. This may include the local | |
49 | * processor. | |
50 | */ | |
51 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), | |
52 | smp_call_func_t func, void *info, bool wait, | |
53 | gfp_t gfp_flags); | |
54 | ||
966a9671 | 55 | int smp_call_function_single_async(int cpu, call_single_data_t *csd); |
7cf64f86 | 56 | |
1da177e4 LT |
57 | #ifdef CONFIG_SMP |
58 | ||
59 | #include <linux/preempt.h> | |
60 | #include <linux/kernel.h> | |
61 | #include <linux/compiler.h> | |
62 | #include <linux/thread_info.h> | |
63 | #include <asm/smp.h> | |
1da177e4 LT |
64 | |
65 | /* | |
66 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. | |
67 | * (defined in asm header): | |
d1dedb52 | 68 | */ |
1da177e4 LT |
69 | |
70 | /* | |
71 | * stops all CPUs but the current one: | |
72 | */ | |
73 | extern void smp_send_stop(void); | |
74 | ||
75 | /* | |
76 | * sends a 'reschedule' event to another CPU: | |
77 | */ | |
78 | extern void smp_send_reschedule(int cpu); | |
79 | ||
80 | ||
81 | /* | |
82 | * Prepare machine for booting other CPUs. | |
83 | */ | |
84 | extern void smp_prepare_cpus(unsigned int max_cpus); | |
85 | ||
86 | /* | |
87 | * Bring a CPU up | |
88 | */ | |
8239c25f | 89 | extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); |
1da177e4 LT |
90 | |
91 | /* | |
92 | * Final polishing of CPUs | |
93 | */ | |
94 | extern void smp_cpus_done(unsigned int max_cpus); | |
95 | ||
96 | /* | |
97 | * Call a function on all other processors | |
98 | */ | |
3a5f65df | 99 | int smp_call_function(smp_call_func_t func, void *info, int wait); |
54b11e6d | 100 | void smp_call_function_many(const struct cpumask *mask, |
3a5f65df | 101 | smp_call_func_t func, void *info, bool wait); |
2d3854a3 | 102 | |
2ea6dec4 | 103 | int smp_call_function_any(const struct cpumask *mask, |
3a5f65df | 104 | smp_call_func_t func, void *info, int wait); |
2ea6dec4 | 105 | |
f37f435f | 106 | void kick_all_cpus_sync(void); |
c6f4459f | 107 | void wake_up_all_idle_cpus(void); |
f37f435f | 108 | |
3d442233 JA |
109 | /* |
110 | * Generic and arch helpers | |
111 | */ | |
d8ad7d11 | 112 | void __init call_function_init(void); |
3d442233 | 113 | void generic_smp_call_function_single_interrupt(void); |
9a46ad6d SL |
114 | #define generic_smp_call_function_interrupt \ |
115 | generic_smp_call_function_single_interrupt | |
a3bc0dbc | 116 | |
1da177e4 LT |
117 | /* |
118 | * Mark the boot cpu "online" so that it can call console drivers in | |
119 | * printk() and can access its per-cpu storage. | |
120 | */ | |
121 | void smp_prepare_boot_cpu(void); | |
122 | ||
ca74a6f8 | 123 | extern unsigned int setup_max_cpus; |
34db18a0 AW |
124 | extern void __init setup_nr_cpu_ids(void); |
125 | extern void __init smp_init(void); | |
ca74a6f8 | 126 | |
8ce371f9 PZ |
127 | extern int __boot_cpu_id; |
128 | ||
129 | static inline int get_boot_cpu_id(void) | |
130 | { | |
131 | return __boot_cpu_id; | |
132 | } | |
133 | ||
1da177e4 LT |
134 | #else /* !SMP */ |
135 | ||
d1dedb52 IM |
136 | static inline void smp_send_stop(void) { } |
137 | ||
1da177e4 LT |
138 | /* |
139 | * These macros fold the SMP functionality into a single CPU system | |
140 | */ | |
39c715b7 | 141 | #define raw_smp_processor_id() 0 |
3a5f65df | 142 | static inline int up_smp_call_function(smp_call_func_t func, void *info) |
3c30b06d CK |
143 | { |
144 | return 0; | |
145 | } | |
8691e5a8 | 146 | #define smp_call_function(func, info, wait) \ |
a5fbb6d1 | 147 | (up_smp_call_function(func, info)) |
3b8967d7 | 148 | |
79a88102 | 149 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c | 150 | #define smp_prepare_boot_cpu() do {} while (0) |
d2ff9118 RR |
151 | #define smp_call_function_many(mask, func, info, wait) \ |
152 | (up_smp_call_function(func, info)) | |
d8ad7d11 | 153 | static inline void call_function_init(void) { } |
2ea6dec4 RR |
154 | |
155 | static inline int | |
3a5f65df | 156 | smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, |
2ea6dec4 | 157 | void *info, int wait) |
3d442233 | 158 | { |
2ea6dec4 | 159 | return smp_call_function_single(0, func, info, wait); |
3d442233 | 160 | } |
2ea6dec4 | 161 | |
f37f435f | 162 | static inline void kick_all_cpus_sync(void) { } |
c6f4459f | 163 | static inline void wake_up_all_idle_cpus(void) { } |
f37f435f | 164 | |
30b8b006 TG |
165 | #ifdef CONFIG_UP_LATE_INIT |
166 | extern void __init up_late_init(void); | |
167 | static inline void smp_init(void) { up_late_init(); } | |
168 | #else | |
169 | static inline void smp_init(void) { } | |
170 | #endif | |
171 | ||
8ce371f9 PZ |
172 | static inline int get_boot_cpu_id(void) |
173 | { | |
174 | return 0; | |
175 | } | |
176 | ||
1da177e4 LT |
177 | #endif /* !SMP */ |
178 | ||
179 | /* | |
39c715b7 | 180 | * smp_processor_id(): get the current CPU ID. |
1da177e4 | 181 | * |
cfd8d6c0 | 182 | * if DEBUG_PREEMPT is enabled then we check whether it is |
39c715b7 IM |
183 | * used in a preemption-safe way. (smp_processor_id() is safe |
184 | * if it's used in a preemption-off critical section, or in | |
185 | * a thread that is bound to the current CPU.) | |
1da177e4 | 186 | * |
39c715b7 IM |
187 | * NOTE: raw_smp_processor_id() is for internal use only |
188 | * (smp_processor_id() is the preferred variant), but in rare | |
189 | * instances it might also be used to turn off false positives | |
190 | * (i.e. smp_processor_id() use that the debugging code reports but | |
191 | * which use for some reason is legal). Don't use this to hack around | |
192 | * the warning message, as your code might not work under PREEMPT. | |
1da177e4 | 193 | */ |
39c715b7 IM |
194 | #ifdef CONFIG_DEBUG_PREEMPT |
195 | extern unsigned int debug_smp_processor_id(void); | |
196 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 197 | #else |
39c715b7 | 198 | # define smp_processor_id() raw_smp_processor_id() |
1da177e4 LT |
199 | #endif |
200 | ||
201 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) | |
202 | #define put_cpu() preempt_enable() | |
1da177e4 | 203 | |
a146649b IM |
204 | /* |
205 | * Callback to arch code if there's nosmp or maxcpus=0 on the | |
206 | * boot command line: | |
207 | */ | |
208 | extern void arch_disable_smp_support(void); | |
209 | ||
fb37bb04 PG |
210 | extern void arch_enable_nonboot_cpus_begin(void); |
211 | extern void arch_enable_nonboot_cpus_end(void); | |
212 | ||
033ab7f8 AM |
213 | void smp_setup_processor_id(void); |
214 | ||
df8ce9d7 JG |
215 | int smp_call_on_cpu(unsigned int cpu, int (*func)(void *), void *par, |
216 | bool phys); | |
217 | ||
31487f83 RW |
218 | /* SMP core functions */ |
219 | int smpcfd_prepare_cpu(unsigned int cpu); | |
220 | int smpcfd_dead_cpu(unsigned int cpu); | |
221 | int smpcfd_dying_cpu(unsigned int cpu); | |
222 | ||
1da177e4 | 223 | #endif /* __LINUX_SMP_H */ |