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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
9#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/list.h>
12#include <linux/cpumask.h>
13
14extern void cpu_idle(void);
15
16struct call_single_data {
17 struct list_head list;
18 void (*func) (void *info);
19 void *info;
20 u16 flags;
21 u16 priv;
22};
23
24#ifdef CONFIG_SMP
25
26#include <linux/preempt.h>
27#include <linux/kernel.h>
28#include <linux/compiler.h>
29#include <linux/thread_info.h>
30#include <asm/smp.h>
31
32/*
33 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
34 * (defined in asm header):
35 */
36
37/*
38 * stops all CPUs but the current one:
39 */
40extern void smp_send_stop(void);
41
42/*
43 * sends a 'reschedule' event to another CPU:
44 */
45extern void smp_send_reschedule(int cpu);
46
47
48/*
49 * Prepare machine for booting other CPUs.
50 */
51extern void smp_prepare_cpus(unsigned int max_cpus);
52
53/*
54 * Bring a CPU up
55 */
56extern int __cpu_up(unsigned int cpunum);
57
58/*
59 * Final polishing of CPUs
60 */
61extern void smp_cpus_done(unsigned int max_cpus);
62
63/*
64 * Call a function on all other processors
65 */
66int smp_call_function(void(*func)(void *info), void *info, int wait);
67/* Deprecated: use smp_call_function_many() which uses a cpumask ptr. */
68int smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
69 int wait);
70
71static inline void smp_call_function_many(const struct cpumask *mask,
72 void (*func)(void *info), void *info,
73 int wait)
74{
75 smp_call_function_mask(*mask, func, info, wait);
76}
77
78int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
79 int wait);
80void __smp_call_function_single(int cpuid, struct call_single_data *data);
81
82/*
83 * Generic and arch helpers
84 */
85#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
86void generic_smp_call_function_single_interrupt(void);
87void generic_smp_call_function_interrupt(void);
88void ipi_call_lock(void);
89void ipi_call_unlock(void);
90void ipi_call_lock_irq(void);
91void ipi_call_unlock_irq(void);
92#endif
93
94/*
95 * Call a function on all processors
96 */
97int on_each_cpu(void (*func) (void *info), void *info, int wait);
98
99#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
100#define MSG_ALL 0x8001
101
102#define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
103#define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
104 * when rebooting
105 */
106#define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
107#define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
108
109/*
110 * Mark the boot cpu "online" so that it can call console drivers in
111 * printk() and can access its per-cpu storage.
112 */
113void smp_prepare_boot_cpu(void);
114
115extern unsigned int setup_max_cpus;
116
117#else /* !SMP */
118
119/*
120 * These macros fold the SMP functionality into a single CPU system
121 */
122#define raw_smp_processor_id() 0
123static inline int up_smp_call_function(void (*func)(void *), void *info)
124{
125 return 0;
126}
127#define smp_call_function(func, info, wait) \
128 (up_smp_call_function(func, info))
129#define on_each_cpu(func,info,wait) \
130 ({ \
131 local_irq_disable(); \
132 func(info); \
133 local_irq_enable(); \
134 0; \
135 })
136static inline void smp_send_reschedule(int cpu) { }
137#define num_booting_cpus() 1
138#define smp_prepare_boot_cpu() do {} while (0)
139#define smp_call_function_single(cpuid, func, info, wait) \
140({ \
141 WARN_ON(cpuid != 0); \
142 local_irq_disable(); \
143 (func)(info); \
144 local_irq_enable(); \
145 0; \
146})
147#define smp_call_function_mask(mask, func, info, wait) \
148 (up_smp_call_function(func, info))
149#define smp_call_function_many(mask, func, info, wait) \
150 (up_smp_call_function(func, info))
151static inline void init_call_single_data(void)
152{
153}
154#endif /* !SMP */
155
156/*
157 * smp_processor_id(): get the current CPU ID.
158 *
159 * if DEBUG_PREEMPT is enabled the we check whether it is
160 * used in a preemption-safe way. (smp_processor_id() is safe
161 * if it's used in a preemption-off critical section, or in
162 * a thread that is bound to the current CPU.)
163 *
164 * NOTE: raw_smp_processor_id() is for internal use only
165 * (smp_processor_id() is the preferred variant), but in rare
166 * instances it might also be used to turn off false positives
167 * (i.e. smp_processor_id() use that the debugging code reports but
168 * which use for some reason is legal). Don't use this to hack around
169 * the warning message, as your code might not work under PREEMPT.
170 */
171#ifdef CONFIG_DEBUG_PREEMPT
172 extern unsigned int debug_smp_processor_id(void);
173# define smp_processor_id() debug_smp_processor_id()
174#else
175# define smp_processor_id() raw_smp_processor_id()
176#endif
177
178#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
179#define put_cpu() preempt_enable()
180#define put_cpu_no_resched() preempt_enable_no_resched()
181
182void smp_setup_processor_id(void);
183
184#endif /* __LINUX_SMP_H */