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