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