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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> |
1da177e4 LT |
14 | |
15 | extern void cpu_idle(void); | |
16 | ||
3a5f65df | 17 | typedef void (*smp_call_func_t)(void *info); |
3d442233 JA |
18 | struct call_single_data { |
19 | struct list_head list; | |
3a5f65df | 20 | smp_call_func_t func; |
3d442233 | 21 | void *info; |
54514a70 DM |
22 | u16 flags; |
23 | u16 priv; | |
3d442233 JA |
24 | }; |
25 | ||
e057d7ae MT |
26 | /* total number of cpus in this system (may exceed NR_CPUS) */ |
27 | extern unsigned int total_cpus; | |
28 | ||
3a5f65df DH |
29 | int smp_call_function_single(int cpuid, smp_call_func_t func, void *info, |
30 | int wait); | |
53ce3d95 | 31 | |
1da177e4 LT |
32 | #ifdef CONFIG_SMP |
33 | ||
34 | #include <linux/preempt.h> | |
35 | #include <linux/kernel.h> | |
36 | #include <linux/compiler.h> | |
37 | #include <linux/thread_info.h> | |
38 | #include <asm/smp.h> | |
1da177e4 LT |
39 | |
40 | /* | |
41 | * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc. | |
42 | * (defined in asm header): | |
d1dedb52 | 43 | */ |
1da177e4 LT |
44 | |
45 | /* | |
46 | * stops all CPUs but the current one: | |
47 | */ | |
48 | extern void smp_send_stop(void); | |
49 | ||
50 | /* | |
51 | * sends a 'reschedule' event to another CPU: | |
52 | */ | |
53 | extern void smp_send_reschedule(int cpu); | |
54 | ||
55 | ||
56 | /* | |
57 | * Prepare machine for booting other CPUs. | |
58 | */ | |
59 | extern void smp_prepare_cpus(unsigned int max_cpus); | |
60 | ||
61 | /* | |
62 | * Bring a CPU up | |
63 | */ | |
8239c25f | 64 | extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle); |
1da177e4 LT |
65 | |
66 | /* | |
67 | * Final polishing of CPUs | |
68 | */ | |
69 | extern void smp_cpus_done(unsigned int max_cpus); | |
70 | ||
71 | /* | |
72 | * Call a function on all other processors | |
73 | */ | |
3a5f65df | 74 | int smp_call_function(smp_call_func_t func, void *info, int wait); |
54b11e6d | 75 | void smp_call_function_many(const struct cpumask *mask, |
3a5f65df | 76 | smp_call_func_t func, void *info, bool wait); |
2d3854a3 | 77 | |
6e275637 PZ |
78 | void __smp_call_function_single(int cpuid, struct call_single_data *data, |
79 | int wait); | |
3d442233 | 80 | |
2ea6dec4 | 81 | int smp_call_function_any(const struct cpumask *mask, |
3a5f65df | 82 | smp_call_func_t func, void *info, int wait); |
2ea6dec4 | 83 | |
f37f435f TG |
84 | void kick_all_cpus_sync(void); |
85 | ||
3d442233 JA |
86 | /* |
87 | * Generic and arch helpers | |
88 | */ | |
89 | #ifdef CONFIG_USE_GENERIC_SMP_HELPERS | |
d8ad7d11 | 90 | void __init call_function_init(void); |
3d442233 | 91 | void generic_smp_call_function_single_interrupt(void); |
9a46ad6d SL |
92 | #define generic_smp_call_function_interrupt \ |
93 | generic_smp_call_function_single_interrupt | |
d8ad7d11 TI |
94 | #else |
95 | static inline void call_function_init(void) { } | |
3d442233 | 96 | #endif |
a3bc0dbc | 97 | |
1da177e4 LT |
98 | /* |
99 | * Call a function on all processors | |
100 | */ | |
3a5f65df | 101 | int on_each_cpu(smp_call_func_t func, void *info, int wait); |
1da177e4 | 102 | |
3fc498f1 GBY |
103 | /* |
104 | * Call a function on processors specified by mask, which might include | |
105 | * the local one. | |
106 | */ | |
107 | void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func, | |
108 | void *info, bool wait); | |
109 | ||
b3a7e98e GBY |
110 | /* |
111 | * Call a function on each processor for which the supplied function | |
112 | * cond_func returns a positive value. This may include the local | |
113 | * processor. | |
114 | */ | |
115 | void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info), | |
116 | smp_call_func_t func, void *info, bool wait, | |
117 | gfp_t gfp_flags); | |
118 | ||
1da177e4 LT |
119 | /* |
120 | * Mark the boot cpu "online" so that it can call console drivers in | |
121 | * printk() and can access its per-cpu storage. | |
122 | */ | |
123 | void smp_prepare_boot_cpu(void); | |
124 | ||
ca74a6f8 | 125 | extern unsigned int setup_max_cpus; |
34db18a0 AW |
126 | extern void __init setup_nr_cpu_ids(void); |
127 | extern void __init smp_init(void); | |
ca74a6f8 | 128 | |
1da177e4 LT |
129 | #else /* !SMP */ |
130 | ||
d1dedb52 IM |
131 | static inline void smp_send_stop(void) { } |
132 | ||
1da177e4 LT |
133 | /* |
134 | * These macros fold the SMP functionality into a single CPU system | |
135 | */ | |
39c715b7 | 136 | #define raw_smp_processor_id() 0 |
3a5f65df | 137 | static inline int up_smp_call_function(smp_call_func_t func, void *info) |
3c30b06d CK |
138 | { |
139 | return 0; | |
140 | } | |
8691e5a8 | 141 | #define smp_call_function(func, info, wait) \ |
a5fbb6d1 | 142 | (up_smp_call_function(func, info)) |
15c8b6c1 | 143 | #define on_each_cpu(func,info,wait) \ |
78eef01b AM |
144 | ({ \ |
145 | local_irq_disable(); \ | |
146 | func(info); \ | |
147 | local_irq_enable(); \ | |
148 | 0; \ | |
149 | }) | |
3fc498f1 GBY |
150 | /* |
151 | * Note we still need to test the mask even for UP | |
152 | * because we actually can get an empty mask from | |
153 | * code that on SMP might call us without the local | |
154 | * CPU in the mask. | |
155 | */ | |
156 | #define on_each_cpu_mask(mask, func, info, wait) \ | |
157 | do { \ | |
158 | if (cpumask_test_cpu(0, (mask))) { \ | |
159 | local_irq_disable(); \ | |
160 | (func)(info); \ | |
161 | local_irq_enable(); \ | |
162 | } \ | |
163 | } while (0) | |
b3a7e98e GBY |
164 | /* |
165 | * Preemption is disabled here to make sure the cond_func is called under the | |
166 | * same condtions in UP and SMP. | |
167 | */ | |
168 | #define on_each_cpu_cond(cond_func, func, info, wait, gfp_flags)\ | |
169 | do { \ | |
170 | void *__info = (info); \ | |
171 | preempt_disable(); \ | |
172 | if ((cond_func)(0, __info)) { \ | |
173 | local_irq_disable(); \ | |
174 | (func)(__info); \ | |
175 | local_irq_enable(); \ | |
176 | } \ | |
177 | preempt_enable(); \ | |
178 | } while (0) | |
3fc498f1 | 179 | |
79a88102 | 180 | static inline void smp_send_reschedule(int cpu) { } |
2ac6608c | 181 | #define smp_prepare_boot_cpu() do {} while (0) |
d2ff9118 RR |
182 | #define smp_call_function_many(mask, func, info, wait) \ |
183 | (up_smp_call_function(func, info)) | |
d8ad7d11 | 184 | static inline void call_function_init(void) { } |
2ea6dec4 RR |
185 | |
186 | static inline int | |
3a5f65df | 187 | smp_call_function_any(const struct cpumask *mask, smp_call_func_t func, |
2ea6dec4 | 188 | void *info, int wait) |
3d442233 | 189 | { |
2ea6dec4 | 190 | return smp_call_function_single(0, func, info, wait); |
3d442233 | 191 | } |
2ea6dec4 | 192 | |
f37f435f TG |
193 | static inline void kick_all_cpus_sync(void) { } |
194 | ||
1da177e4 LT |
195 | #endif /* !SMP */ |
196 | ||
197 | /* | |
39c715b7 | 198 | * smp_processor_id(): get the current CPU ID. |
1da177e4 | 199 | * |
cfd8d6c0 | 200 | * if DEBUG_PREEMPT is enabled then we check whether it is |
39c715b7 IM |
201 | * used in a preemption-safe way. (smp_processor_id() is safe |
202 | * if it's used in a preemption-off critical section, or in | |
203 | * a thread that is bound to the current CPU.) | |
1da177e4 | 204 | * |
39c715b7 IM |
205 | * NOTE: raw_smp_processor_id() is for internal use only |
206 | * (smp_processor_id() is the preferred variant), but in rare | |
207 | * instances it might also be used to turn off false positives | |
208 | * (i.e. smp_processor_id() use that the debugging code reports but | |
209 | * which use for some reason is legal). Don't use this to hack around | |
210 | * the warning message, as your code might not work under PREEMPT. | |
1da177e4 | 211 | */ |
39c715b7 IM |
212 | #ifdef CONFIG_DEBUG_PREEMPT |
213 | extern unsigned int debug_smp_processor_id(void); | |
214 | # define smp_processor_id() debug_smp_processor_id() | |
1da177e4 | 215 | #else |
39c715b7 | 216 | # define smp_processor_id() raw_smp_processor_id() |
1da177e4 LT |
217 | #endif |
218 | ||
219 | #define get_cpu() ({ preempt_disable(); smp_processor_id(); }) | |
220 | #define put_cpu() preempt_enable() | |
1da177e4 | 221 | |
a146649b IM |
222 | /* |
223 | * Callback to arch code if there's nosmp or maxcpus=0 on the | |
224 | * boot command line: | |
225 | */ | |
226 | extern void arch_disable_smp_support(void); | |
227 | ||
033ab7f8 AM |
228 | void smp_setup_processor_id(void); |
229 | ||
1da177e4 | 230 | #endif /* __LINUX_SMP_H */ |