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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __LINUX_SMP_H
2#define __LINUX_SMP_H
3
4/*
5 * Generic SMP support
6 * Alan Cox. <alan@redhat.com>
7 */
8
Heiko Carstens79974a0e2007-05-16 22:11:09 -07009#include <linux/errno.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010
11extern void cpu_idle(void);
12
13#ifdef CONFIG_SMP
14
15#include <linux/preempt.h>
16#include <linux/kernel.h>
17#include <linux/compiler.h>
18#include <linux/thread_info.h>
19#include <asm/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020
21/*
22 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
23 * (defined in asm header):
24 */
25
26/*
27 * stops all CPUs but the current one:
28 */
29extern void smp_send_stop(void);
30
31/*
32 * sends a 'reschedule' event to another CPU:
33 */
34extern void smp_send_reschedule(int cpu);
35
36
37/*
38 * Prepare machine for booting other CPUs.
39 */
40extern void smp_prepare_cpus(unsigned int max_cpus);
41
42/*
43 * Bring a CPU up
44 */
45extern int __cpu_up(unsigned int cpunum);
46
47/*
48 * Final polishing of CPUs
49 */
50extern void smp_cpus_done(unsigned int max_cpus);
51
52/*
53 * Call a function on all other processors
54 */
Andrew Morton78eef012006-03-22 00:08:16 -080055int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Andrew Mortona3bc0db2006-09-25 23:32:33 -070057int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
58 int retry, int wait);
59
Linus Torvalds1da177e2005-04-16 15:20:36 -070060/*
61 * Call a function on all processors
62 */
Andrew Morton78eef012006-03-22 00:08:16 -080063int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
66#define MSG_ALL 0x8001
67
68#define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
69#define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
70 * when rebooting
71 */
72#define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
73#define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
74
75/*
76 * Mark the boot cpu "online" so that it can call console drivers in
77 * printk() and can access its per-cpu storage.
78 */
79void smp_prepare_boot_cpu(void);
80
Andi Kleenca74a6f2008-01-30 13:33:17 +010081extern unsigned int setup_max_cpus;
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083#else /* !SMP */
84
85/*
86 * These macros fold the SMP functionality into a single CPU system
87 */
Ingo Molnar39c715b2005-06-21 17:14:34 -070088#define raw_smp_processor_id() 0
Ingo Molnara5fbb6d2007-11-09 22:39:38 +010089static inline int up_smp_call_function(void (*func)(void *), void *info)
Con Kolivas3c30b062006-03-26 01:37:19 -080090{
91 return 0;
92}
Ingo Molnara5fbb6d2007-11-09 22:39:38 +010093#define smp_call_function(func, info, retry, wait) \
94 (up_smp_call_function(func, info))
Andrew Morton78eef012006-03-22 00:08:16 -080095#define on_each_cpu(func,info,retry,wait) \
96 ({ \
97 local_irq_disable(); \
98 func(info); \
99 local_irq_enable(); \
100 0; \
101 })
Richard Henderson79a88102005-07-28 01:07:41 -0700102static inline void smp_send_reschedule(int cpu) { }
Linus Torvalds2ac66082005-07-28 10:34:47 -0700103#define num_booting_cpus() 1
104#define smp_prepare_boot_cpu() do {} while (0)
Al Viro8dfd5882007-07-17 22:29:46 +0100105#define smp_call_function_single(cpuid, func, info, retry, wait) \
106({ \
107 WARN_ON(cpuid != 0); \
108 local_irq_disable(); \
109 (func)(info); \
110 local_irq_enable(); \
111 0; \
112})
Ingo Molnara5fbb6d2007-11-09 22:39:38 +0100113#define smp_call_function_mask(mask, func, info, wait) \
114 (up_smp_call_function(func, info))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116#endif /* !SMP */
117
118/*
Ingo Molnar39c715b2005-06-21 17:14:34 -0700119 * smp_processor_id(): get the current CPU ID.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 *
Ingo Molnar39c715b2005-06-21 17:14:34 -0700121 * if DEBUG_PREEMPT is enabled the we check whether it is
122 * used in a preemption-safe way. (smp_processor_id() is safe
123 * if it's used in a preemption-off critical section, or in
124 * a thread that is bound to the current CPU.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 *
Ingo Molnar39c715b2005-06-21 17:14:34 -0700126 * NOTE: raw_smp_processor_id() is for internal use only
127 * (smp_processor_id() is the preferred variant), but in rare
128 * instances it might also be used to turn off false positives
129 * (i.e. smp_processor_id() use that the debugging code reports but
130 * which use for some reason is legal). Don't use this to hack around
131 * the warning message, as your code might not work under PREEMPT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700133#ifdef CONFIG_DEBUG_PREEMPT
134 extern unsigned int debug_smp_processor_id(void);
135# define smp_processor_id() debug_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136#else
Ingo Molnar39c715b2005-06-21 17:14:34 -0700137# define smp_processor_id() raw_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138#endif
139
140#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
141#define put_cpu() preempt_enable()
142#define put_cpu_no_resched() preempt_enable_no_resched()
143
Andrew Morton033ab7f2006-06-30 01:55:50 -0700144void smp_setup_processor_id(void);
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146#endif /* __LINUX_SMP_H */