blob: 8cc38d3bab0c57a79f68fe53e4915f9393335cba [file] [log] [blame]
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>
David S. Miller54514a72008-09-23 22:15:57 -070010#include <linux/types.h>
Jens Axboe3d442232008-06-26 11:21:34 +020011#include <linux/list.h>
Jens Axboe3d442232008-06-26 11:21:34 +020012#include <linux/cpumask.h>
Heiko Carstens04948c72011-03-23 08:24:58 +010013#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
15extern void cpu_idle(void);
16
David Howells3a5f65d2010-10-27 17:28:36 +010017typedef void (*smp_call_func_t)(void *info);
Jens Axboe3d442232008-06-26 11:21:34 +020018struct call_single_data {
19 struct list_head list;
David Howells3a5f65d2010-10-27 17:28:36 +010020 smp_call_func_t func;
Jens Axboe3d442232008-06-26 11:21:34 +020021 void *info;
David S. Miller54514a72008-09-23 22:15:57 -070022 u16 flags;
23 u16 priv;
Jens Axboe3d442232008-06-26 11:21:34 +020024};
25
Mike Travise057d7a2008-12-15 20:26:48 -080026/* total number of cpus in this system (may exceed NR_CPUS) */
27extern unsigned int total_cpus;
28
David Howells3a5f65d2010-10-27 17:28:36 +010029int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
30 int wait);
Andrew Morton53ce3d92009-01-09 12:27:08 -080031
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#ifdef CONFIG_SMP
33
34#include <linux/preempt.h>
35#include <linux/kernel.h>
36#include <linux/compiler.h>
37#include <linux/thread_info.h>
38#include <asm/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40/*
41 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
42 * (defined in asm header):
Ingo Molnard1dedb52009-03-13 11:14:06 +010043 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070044
45/*
46 * stops all CPUs but the current one:
47 */
48extern void smp_send_stop(void);
49
50/*
51 * sends a 'reschedule' event to another CPU:
52 */
53extern void smp_send_reschedule(int cpu);
54
55
56/*
57 * Prepare machine for booting other CPUs.
58 */
59extern void smp_prepare_cpus(unsigned int max_cpus);
60
61/*
62 * Bring a CPU up
63 */
64extern int __cpu_up(unsigned int cpunum);
65
66/*
67 * Final polishing of CPUs
68 */
69extern void smp_cpus_done(unsigned int max_cpus);
70
71/*
72 * Call a function on all other processors
73 */
David Howells3a5f65d2010-10-27 17:28:36 +010074int smp_call_function(smp_call_func_t func, void *info, int wait);
Rusty Russell54b11e62008-12-30 09:05:16 +103075void smp_call_function_many(const struct cpumask *mask,
David Howells3a5f65d2010-10-27 17:28:36 +010076 smp_call_func_t func, void *info, bool wait);
Rusty Russell2d3854a2008-11-05 13:39:10 +110077
Peter Zijlstra6e275632009-02-25 13:59:48 +010078void __smp_call_function_single(int cpuid, struct call_single_data *data,
79 int wait);
Jens Axboe3d442232008-06-26 11:21:34 +020080
Rusty Russell2ea6dec2009-11-17 14:27:27 -080081int smp_call_function_any(const struct cpumask *mask,
David Howells3a5f65d2010-10-27 17:28:36 +010082 smp_call_func_t func, void *info, int wait);
Rusty Russell2ea6dec2009-11-17 14:27:27 -080083
Jens Axboe3d442232008-06-26 11:21:34 +020084/*
85 * Generic and arch helpers
86 */
87#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
Takao Indohd8ad7d12011-03-29 12:35:04 -040088void __init call_function_init(void);
Jens Axboe3d442232008-06-26 11:21:34 +020089void generic_smp_call_function_single_interrupt(void);
90void generic_smp_call_function_interrupt(void);
Jens Axboe3d442232008-06-26 11:21:34 +020091void ipi_call_lock(void);
92void ipi_call_unlock(void);
93void ipi_call_lock_irq(void);
94void ipi_call_unlock_irq(void);
Takao Indohd8ad7d12011-03-29 12:35:04 -040095#else
96static inline void call_function_init(void) { }
Jens Axboe3d442232008-06-26 11:21:34 +020097#endif
Andrew Mortona3bc0db2006-09-25 23:32:33 -070098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/*
100 * Call a function on all processors
101 */
David Howells3a5f65d2010-10-27 17:28:36 +0100102int on_each_cpu(smp_call_func_t func, void *info, int wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104/*
105 * Mark the boot cpu "online" so that it can call console drivers in
106 * printk() and can access its per-cpu storage.
107 */
108void smp_prepare_boot_cpu(void);
109
Andi Kleenca74a6f2008-01-30 13:33:17 +0100110extern unsigned int setup_max_cpus;
Amerigo Wang34db18a02011-03-22 16:34:06 -0700111extern void __init setup_nr_cpu_ids(void);
112extern void __init smp_init(void);
Andi Kleenca74a6f2008-01-30 13:33:17 +0100113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#else /* !SMP */
115
Ingo Molnard1dedb52009-03-13 11:14:06 +0100116static inline void smp_send_stop(void) { }
117
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118/*
119 * These macros fold the SMP functionality into a single CPU system
120 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700121#define raw_smp_processor_id() 0
David Howells3a5f65d2010-10-27 17:28:36 +0100122static inline int up_smp_call_function(smp_call_func_t func, void *info)
Con Kolivas3c30b062006-03-26 01:37:19 -0800123{
124 return 0;
125}
Jens Axboe8691e5a2008-06-06 11:18:06 +0200126#define smp_call_function(func, info, wait) \
Ingo Molnara5fbb6d2007-11-09 22:39:38 +0100127 (up_smp_call_function(func, info))
Jens Axboe15c8b6c2008-05-09 09:39:44 +0200128#define on_each_cpu(func,info,wait) \
Andrew Morton78eef012006-03-22 00:08:16 -0800129 ({ \
130 local_irq_disable(); \
131 func(info); \
132 local_irq_enable(); \
133 0; \
134 })
Richard Henderson79a88102005-07-28 01:07:41 -0700135static inline void smp_send_reschedule(int cpu) { }
Linus Torvalds2ac66082005-07-28 10:34:47 -0700136#define num_booting_cpus() 1
137#define smp_prepare_boot_cpu() do {} while (0)
Rusty Russelld2ff9112008-12-15 19:04:35 +1030138#define smp_call_function_many(mask, func, info, wait) \
139 (up_smp_call_function(func, info))
Takao Indohd8ad7d12011-03-29 12:35:04 -0400140static inline void call_function_init(void) { }
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800141
142static inline int
David Howells3a5f65d2010-10-27 17:28:36 +0100143smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800144 void *info, int wait)
Jens Axboe3d442232008-06-26 11:21:34 +0200145{
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800146 return smp_call_function_single(0, func, info, wait);
Jens Axboe3d442232008-06-26 11:21:34 +0200147}
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149#endif /* !SMP */
150
151/*
Ingo Molnar39c715b2005-06-21 17:14:34 -0700152 * smp_processor_id(): get the current CPU ID.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 *
Rakib Mullickcfd8d6c2010-03-05 13:42:45 -0800154 * if DEBUG_PREEMPT is enabled then we check whether it is
Ingo Molnar39c715b2005-06-21 17:14:34 -0700155 * used in a preemption-safe way. (smp_processor_id() is safe
156 * if it's used in a preemption-off critical section, or in
157 * a thread that is bound to the current CPU.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 *
Ingo Molnar39c715b2005-06-21 17:14:34 -0700159 * NOTE: raw_smp_processor_id() is for internal use only
160 * (smp_processor_id() is the preferred variant), but in rare
161 * instances it might also be used to turn off false positives
162 * (i.e. smp_processor_id() use that the debugging code reports but
163 * which use for some reason is legal). Don't use this to hack around
164 * the warning message, as your code might not work under PREEMPT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700166#ifdef CONFIG_DEBUG_PREEMPT
167 extern unsigned int debug_smp_processor_id(void);
168# define smp_processor_id() debug_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169#else
Ingo Molnar39c715b2005-06-21 17:14:34 -0700170# define smp_processor_id() raw_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171#endif
172
173#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
174#define put_cpu() preempt_enable()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175
Ingo Molnara1466492009-01-31 14:09:06 +0100176/*
177 * Callback to arch code if there's nosmp or maxcpus=0 on the
178 * boot command line:
179 */
180extern void arch_disable_smp_support(void);
181
Andrew Morton033ab7f2006-06-30 01:55:50 -0700182void smp_setup_processor_id(void);
183
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184#endif /* __LINUX_SMP_H */