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1da177e4
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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>
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14
15extern void cpu_idle(void);
16
3a5f65df 17typedef void (*smp_call_func_t)(void *info);
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18struct call_single_data {
19 struct list_head list;
3a5f65df 20 smp_call_func_t func;
3d442233 21 void *info;
54514a70 22 u16 flags;
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23};
24
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25/* total number of cpus in this system (may exceed NR_CPUS) */
26extern unsigned int total_cpus;
27
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28int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
29 int wait);
53ce3d95 30
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31/*
32 * Call a function on all processors
33 */
34int on_each_cpu(smp_call_func_t func, void *info, int wait);
35
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36/*
37 * Call a function on processors specified by mask, which might include
38 * the local one.
39 */
40void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
41 void *info, bool wait);
42
43/*
44 * Call a function on each processor for which the supplied function
45 * cond_func returns a positive value. This may include the local
46 * processor.
47 */
48void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
49 smp_call_func_t func, void *info, bool wait,
50 gfp_t gfp_flags);
51
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52#ifdef CONFIG_SMP
53
54#include <linux/preempt.h>
55#include <linux/kernel.h>
56#include <linux/compiler.h>
57#include <linux/thread_info.h>
58#include <asm/smp.h>
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59
60/*
61 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
62 * (defined in asm header):
d1dedb52 63 */
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64
65/*
66 * stops all CPUs but the current one:
67 */
68extern void smp_send_stop(void);
69
70/*
71 * sends a 'reschedule' event to another CPU:
72 */
73extern void smp_send_reschedule(int cpu);
74
75
76/*
77 * Prepare machine for booting other CPUs.
78 */
79extern void smp_prepare_cpus(unsigned int max_cpus);
80
81/*
82 * Bring a CPU up
83 */
8239c25f 84extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
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85
86/*
87 * Final polishing of CPUs
88 */
89extern void smp_cpus_done(unsigned int max_cpus);
90
91/*
92 * Call a function on all other processors
93 */
3a5f65df 94int smp_call_function(smp_call_func_t func, void *info, int wait);
54b11e6d 95void smp_call_function_many(const struct cpumask *mask,
3a5f65df 96 smp_call_func_t func, void *info, bool wait);
2d3854a3 97
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98void __smp_call_function_single(int cpuid, struct call_single_data *data,
99 int wait);
3d442233 100
2ea6dec4 101int smp_call_function_any(const struct cpumask *mask,
3a5f65df 102 smp_call_func_t func, void *info, int wait);
2ea6dec4 103
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104void kick_all_cpus_sync(void);
105
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106/*
107 * Generic and arch helpers
108 */
109#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
d8ad7d11 110void __init call_function_init(void);
3d442233 111void generic_smp_call_function_single_interrupt(void);
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112#define generic_smp_call_function_interrupt \
113 generic_smp_call_function_single_interrupt
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114#else
115static inline void call_function_init(void) { }
3d442233 116#endif
a3bc0dbc 117
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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 */
122void smp_prepare_boot_cpu(void);
123
ca74a6f8 124extern unsigned int setup_max_cpus;
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125extern void __init setup_nr_cpu_ids(void);
126extern void __init smp_init(void);
ca74a6f8 127
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128#else /* !SMP */
129
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130static inline void smp_send_stop(void) { }
131
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132/*
133 * These macros fold the SMP functionality into a single CPU system
134 */
39c715b7 135#define raw_smp_processor_id() 0
3a5f65df 136static inline int up_smp_call_function(smp_call_func_t func, void *info)
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CK
137{
138 return 0;
139}
8691e5a8 140#define smp_call_function(func, info, wait) \
a5fbb6d1 141 (up_smp_call_function(func, info))
3b8967d7 142
79a88102 143static inline void smp_send_reschedule(int cpu) { }
2ac6608c 144#define smp_prepare_boot_cpu() do {} while (0)
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145#define smp_call_function_many(mask, func, info, wait) \
146 (up_smp_call_function(func, info))
d8ad7d11 147static inline void call_function_init(void) { }
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148
149static inline int
3a5f65df 150smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
2ea6dec4 151 void *info, int wait)
3d442233 152{
2ea6dec4 153 return smp_call_function_single(0, func, info, wait);
3d442233 154}
2ea6dec4 155
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156static inline void kick_all_cpus_sync(void) { }
157
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158#endif /* !SMP */
159
160/*
39c715b7 161 * smp_processor_id(): get the current CPU ID.
1da177e4 162 *
cfd8d6c0 163 * if DEBUG_PREEMPT is enabled then we check whether it is
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164 * used in a preemption-safe way. (smp_processor_id() is safe
165 * if it's used in a preemption-off critical section, or in
166 * a thread that is bound to the current CPU.)
1da177e4 167 *
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168 * NOTE: raw_smp_processor_id() is for internal use only
169 * (smp_processor_id() is the preferred variant), but in rare
170 * instances it might also be used to turn off false positives
171 * (i.e. smp_processor_id() use that the debugging code reports but
172 * which use for some reason is legal). Don't use this to hack around
173 * the warning message, as your code might not work under PREEMPT.
1da177e4 174 */
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175#ifdef CONFIG_DEBUG_PREEMPT
176 extern unsigned int debug_smp_processor_id(void);
177# define smp_processor_id() debug_smp_processor_id()
1da177e4 178#else
39c715b7 179# define smp_processor_id() raw_smp_processor_id()
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180#endif
181
182#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
183#define put_cpu() preempt_enable()
1da177e4 184
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185/*
186 * Callback to arch code if there's nosmp or maxcpus=0 on the
187 * boot command line:
188 */
189extern void arch_disable_smp_support(void);
190
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191void smp_setup_processor_id(void);
192
1da177e4 193#endif /* __LINUX_SMP_H */