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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 Carstens79974a02007-05-16 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>
Christoph Hellwig6897fc22014-01-30 15:45:47 -080014#include <linux/llist.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16extern void cpu_idle(void);
17
David Howells3a5f65d2010-10-27 17:28:36 +010018typedef void (*smp_call_func_t)(void *info);
Jens Axboe3d442232008-06-26 11:21:34 +020019struct call_single_data {
Jan Kara0ebeb792014-02-24 16:39:56 +010020 struct llist_node llist;
David Howells3a5f65d2010-10-27 17:28:36 +010021 smp_call_func_t func;
Jens Axboe3d442232008-06-26 11:21:34 +020022 void *info;
David S. Miller54514a72008-09-23 22:15:57 -070023 u16 flags;
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
David Daneyfa688202013-09-11 14:23:24 -070032/*
David Daneybff2dc42013-09-11 14:23:26 -070033 * Call a function on all processors
34 */
35int on_each_cpu(smp_call_func_t func, void *info, int wait);
36
37/*
David Daneyfa688202013-09-11 14:23:24 -070038 * Call a function on processors specified by mask, which might include
39 * the local one.
40 */
41void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
42 void *info, bool wait);
43
44/*
45 * Call a function on each processor for which the supplied function
46 * cond_func returns a positive value. This may include the local
47 * processor.
48 */
49void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
50 smp_call_func_t func, void *info, bool wait,
51 gfp_t gfp_flags);
52
Frederic Weisbeckerc46fff22014-02-24 16:40:02 +010053int smp_call_function_single_async(int cpu, struct call_single_data *csd);
Andrew Morton7cf64f82013-11-14 14:32:09 -080054
Linus Torvalds1da177e2005-04-16 15:20:36 -070055#ifdef CONFIG_SMP
56
57#include <linux/preempt.h>
58#include <linux/kernel.h>
59#include <linux/compiler.h>
60#include <linux/thread_info.h>
61#include <asm/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
63/*
64 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
65 * (defined in asm header):
Ingo Molnard1dedb52009-03-13 11:14:06 +010066 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070067
68/*
69 * stops all CPUs but the current one:
70 */
71extern void smp_send_stop(void);
72
73/*
74 * sends a 'reschedule' event to another CPU:
75 */
76extern void smp_send_reschedule(int cpu);
77
78
79/*
80 * Prepare machine for booting other CPUs.
81 */
82extern void smp_prepare_cpus(unsigned int max_cpus);
83
84/*
85 * Bring a CPU up
86 */
Thomas Gleixner8239c252012-04-20 13:05:42 +000087extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
89/*
90 * Final polishing of CPUs
91 */
92extern void smp_cpus_done(unsigned int max_cpus);
93
94/*
95 * Call a function on all other processors
96 */
David Howells3a5f65d2010-10-27 17:28:36 +010097int smp_call_function(smp_call_func_t func, void *info, int wait);
Rusty Russell54b11e62008-12-30 09:05:16 +103098void smp_call_function_many(const struct cpumask *mask,
David Howells3a5f65d2010-10-27 17:28:36 +010099 smp_call_func_t func, void *info, bool wait);
Rusty Russell2d3854a2008-11-05 13:39:10 +1100100
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800101int smp_call_function_any(const struct cpumask *mask,
David Howells3a5f65d2010-10-27 17:28:36 +0100102 smp_call_func_t func, void *info, int wait);
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800103
Thomas Gleixnerf37f4352012-05-07 17:59:48 +0000104void kick_all_cpus_sync(void);
105
Jens Axboe3d442232008-06-26 11:21:34 +0200106/*
107 * Generic and arch helpers
108 */
Takao Indohd8ad7d12011-03-29 12:35:04 -0400109void __init call_function_init(void);
Jens Axboe3d442232008-06-26 11:21:34 +0200110void generic_smp_call_function_single_interrupt(void);
Shaohua Li9a46ad62013-02-21 16:43:03 -0800111#define generic_smp_call_function_interrupt \
112 generic_smp_call_function_single_interrupt
Andrew Mortona3bc0db2006-09-25 23:32:33 -0700113
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 * Mark the boot cpu "online" so that it can call console drivers in
116 * printk() and can access its per-cpu storage.
117 */
118void smp_prepare_boot_cpu(void);
119
Andi Kleenca74a6f2008-01-30 13:33:17 +0100120extern unsigned int setup_max_cpus;
Amerigo Wang34db18a02011-03-22 16:34:06 -0700121extern void __init setup_nr_cpu_ids(void);
122extern void __init smp_init(void);
Andi Kleenca74a6f2008-01-30 13:33:17 +0100123
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124#else /* !SMP */
125
Ingo Molnard1dedb52009-03-13 11:14:06 +0100126static inline void smp_send_stop(void) { }
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128/*
129 * These macros fold the SMP functionality into a single CPU system
130 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700131#define raw_smp_processor_id() 0
David Howells3a5f65d2010-10-27 17:28:36 +0100132static inline int up_smp_call_function(smp_call_func_t func, void *info)
Con Kolivas3c30b062006-03-26 01:37:19 -0800133{
134 return 0;
135}
Jens Axboe8691e5a2008-06-06 11:18:06 +0200136#define smp_call_function(func, info, wait) \
Ingo Molnara5fbb6d2007-11-09 22:39:38 +0100137 (up_smp_call_function(func, info))
Andrew Morton3b8967d2013-09-11 14:19:37 -0700138
Richard Henderson79a88102005-07-28 01:07:41 -0700139static inline void smp_send_reschedule(int cpu) { }
Linus Torvalds2ac66082005-07-28 10:34:47 -0700140#define smp_prepare_boot_cpu() do {} while (0)
Rusty Russelld2ff9112008-12-15 19:04:35 +1030141#define smp_call_function_many(mask, func, info, wait) \
142 (up_smp_call_function(func, info))
Takao Indohd8ad7d12011-03-29 12:35:04 -0400143static inline void call_function_init(void) { }
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800144
145static inline int
David Howells3a5f65d2010-10-27 17:28:36 +0100146smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800147 void *info, int wait)
Jens Axboe3d442232008-06-26 11:21:34 +0200148{
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800149 return smp_call_function_single(0, func, info, wait);
Jens Axboe3d442232008-06-26 11:21:34 +0200150}
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800151
Thomas Gleixnerf37f4352012-05-07 17:59:48 +0000152static inline void kick_all_cpus_sync(void) { }
153
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154#endif /* !SMP */
155
156/*
Ingo Molnar39c715b2005-06-21 17:14:34 -0700157 * smp_processor_id(): get the current CPU ID.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 *
Rakib Mullickcfd8d6c2010-03-05 13:42:45 -0800159 * if DEBUG_PREEMPT is enabled then we check whether it is
Ingo Molnar39c715b2005-06-21 17:14:34 -0700160 * 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.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 *
Ingo Molnar39c715b2005-06-21 17:14:34 -0700164 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700171#ifdef CONFIG_DEBUG_PREEMPT
172 extern unsigned int debug_smp_processor_id(void);
173# define smp_processor_id() debug_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174#else
Ingo Molnar39c715b2005-06-21 17:14:34 -0700175# define smp_processor_id() raw_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176#endif
177
178#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
179#define put_cpu() preempt_enable()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
Ingo Molnara1466492009-01-31 14:09:06 +0100181/*
182 * Callback to arch code if there's nosmp or maxcpus=0 on the
183 * boot command line:
184 */
185extern void arch_disable_smp_support(void);
186
Paul Gortmakerfb37bb02014-02-10 14:25:49 -0800187extern void arch_enable_nonboot_cpus_begin(void);
188extern void arch_enable_nonboot_cpus_end(void);
189
Andrew Morton033ab7f2006-06-30 01:55:50 -0700190void smp_setup_processor_id(void);
191
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192#endif /* __LINUX_SMP_H */