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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
David Howells3a5f65d2010-10-27 17:28:36 +010016typedef void (*smp_call_func_t)(void *info);
Jens Axboe3d442232008-06-26 11:21:34 +020017struct call_single_data {
Jan Kara0ebeb792014-02-24 16:39:56 +010018 struct llist_node llist;
David Howells3a5f65d2010-10-27 17:28:36 +010019 smp_call_func_t func;
Jens Axboe3d442232008-06-26 11:21:34 +020020 void *info;
David S. Miller54514a72008-09-23 22:15:57 -070021 u16 flags;
Jens Axboe3d442232008-06-26 11:21:34 +020022};
23
Mike Travise057d7a2008-12-15 20:26:48 -080024/* total number of cpus in this system (may exceed NR_CPUS) */
25extern unsigned int total_cpus;
26
David Howells3a5f65d2010-10-27 17:28:36 +010027int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
28 int wait);
Andrew Morton53ce3d92009-01-09 12:27:08 -080029
David Daneyfa688202013-09-11 14:23:24 -070030/*
David Daneybff2dc42013-09-11 14:23:26 -070031 * Call a function on all processors
32 */
33int on_each_cpu(smp_call_func_t func, void *info, int wait);
34
35/*
David Daneyfa688202013-09-11 14:23:24 -070036 * Call a function on processors specified by mask, which might include
37 * the local one.
38 */
39void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
40 void *info, bool wait);
41
42/*
43 * Call a function on each processor for which the supplied function
44 * cond_func returns a positive value. This may include the local
45 * processor.
46 */
47void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
48 smp_call_func_t func, void *info, bool wait,
49 gfp_t gfp_flags);
50
Frederic Weisbeckerc46fff22014-02-24 16:40:02 +010051int smp_call_function_single_async(int cpu, struct call_single_data *csd);
Andrew Morton7cf64f82013-11-14 14:32:09 -080052
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#ifdef CONFIG_SMP
54
55#include <linux/preempt.h>
56#include <linux/kernel.h>
57#include <linux/compiler.h>
58#include <linux/thread_info.h>
59#include <asm/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61/*
62 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
63 * (defined in asm header):
Ingo Molnard1dedb52009-03-13 11:14:06 +010064 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
66/*
67 * stops all CPUs but the current one:
68 */
69extern void smp_send_stop(void);
70
71/*
72 * sends a 'reschedule' event to another CPU:
73 */
74extern void smp_send_reschedule(int cpu);
75
76
77/*
78 * Prepare machine for booting other CPUs.
79 */
80extern void smp_prepare_cpus(unsigned int max_cpus);
81
82/*
83 * Bring a CPU up
84 */
Thomas Gleixner8239c252012-04-20 13:05:42 +000085extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
87/*
88 * Final polishing of CPUs
89 */
90extern void smp_cpus_done(unsigned int max_cpus);
91
92/*
93 * Call a function on all other processors
94 */
David Howells3a5f65d2010-10-27 17:28:36 +010095int smp_call_function(smp_call_func_t func, void *info, int wait);
Rusty Russell54b11e62008-12-30 09:05:16 +103096void smp_call_function_many(const struct cpumask *mask,
David Howells3a5f65d2010-10-27 17:28:36 +010097 smp_call_func_t func, void *info, bool wait);
Rusty Russell2d3854a2008-11-05 13:39:10 +110098
Rusty Russell2ea6dec2009-11-17 14:27:27 -080099int smp_call_function_any(const struct cpumask *mask,
David Howells3a5f65d2010-10-27 17:28:36 +0100100 smp_call_func_t func, void *info, int wait);
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800101
Thomas Gleixnerf37f4352012-05-07 17:59:48 +0000102void kick_all_cpus_sync(void);
103
Jens Axboe3d442232008-06-26 11:21:34 +0200104/*
105 * Generic and arch helpers
106 */
Takao Indohd8ad7d12011-03-29 12:35:04 -0400107void __init call_function_init(void);
Jens Axboe3d442232008-06-26 11:21:34 +0200108void generic_smp_call_function_single_interrupt(void);
Shaohua Li9a46ad62013-02-21 16:43:03 -0800109#define generic_smp_call_function_interrupt \
110 generic_smp_call_function_single_interrupt
Andrew Mortona3bc0db2006-09-25 23:32:33 -0700111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 * Mark the boot cpu "online" so that it can call console drivers in
114 * printk() and can access its per-cpu storage.
115 */
116void smp_prepare_boot_cpu(void);
117
Andi Kleenca74a6f2008-01-30 13:33:17 +0100118extern unsigned int setup_max_cpus;
Amerigo Wang34db18a02011-03-22 16:34:06 -0700119extern void __init setup_nr_cpu_ids(void);
120extern void __init smp_init(void);
Andi Kleenca74a6f2008-01-30 13:33:17 +0100121
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122#else /* !SMP */
123
Ingo Molnard1dedb52009-03-13 11:14:06 +0100124static inline void smp_send_stop(void) { }
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126/*
127 * These macros fold the SMP functionality into a single CPU system
128 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700129#define raw_smp_processor_id() 0
David Howells3a5f65d2010-10-27 17:28:36 +0100130static inline int up_smp_call_function(smp_call_func_t func, void *info)
Con Kolivas3c30b062006-03-26 01:37:19 -0800131{
132 return 0;
133}
Jens Axboe8691e5a2008-06-06 11:18:06 +0200134#define smp_call_function(func, info, wait) \
Ingo Molnara5fbb6d2007-11-09 22:39:38 +0100135 (up_smp_call_function(func, info))
Andrew Morton3b8967d2013-09-11 14:19:37 -0700136
Richard Henderson79a88102005-07-28 01:07:41 -0700137static inline void smp_send_reschedule(int cpu) { }
Linus Torvalds2ac66082005-07-28 10:34:47 -0700138#define smp_prepare_boot_cpu() do {} while (0)
Rusty Russelld2ff9112008-12-15 19:04:35 +1030139#define smp_call_function_many(mask, func, info, wait) \
140 (up_smp_call_function(func, info))
Takao Indohd8ad7d12011-03-29 12:35:04 -0400141static inline void call_function_init(void) { }
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800142
143static inline int
David Howells3a5f65d2010-10-27 17:28:36 +0100144smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800145 void *info, int wait)
Jens Axboe3d442232008-06-26 11:21:34 +0200146{
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800147 return smp_call_function_single(0, func, info, wait);
Jens Axboe3d442232008-06-26 11:21:34 +0200148}
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800149
Thomas Gleixnerf37f4352012-05-07 17:59:48 +0000150static inline void kick_all_cpus_sync(void) { }
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152#endif /* !SMP */
153
154/*
Ingo Molnar39c715b2005-06-21 17:14:34 -0700155 * smp_processor_id(): get the current CPU ID.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 *
Rakib Mullickcfd8d6c2010-03-05 13:42:45 -0800157 * if DEBUG_PREEMPT is enabled then we check whether it is
Ingo Molnar39c715b2005-06-21 17:14:34 -0700158 * used in a preemption-safe way. (smp_processor_id() is safe
159 * if it's used in a preemption-off critical section, or in
160 * a thread that is bound to the current CPU.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 *
Ingo Molnar39c715b2005-06-21 17:14:34 -0700162 * NOTE: raw_smp_processor_id() is for internal use only
163 * (smp_processor_id() is the preferred variant), but in rare
164 * instances it might also be used to turn off false positives
165 * (i.e. smp_processor_id() use that the debugging code reports but
166 * which use for some reason is legal). Don't use this to hack around
167 * the warning message, as your code might not work under PREEMPT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700169#ifdef CONFIG_DEBUG_PREEMPT
170 extern unsigned int debug_smp_processor_id(void);
171# define smp_processor_id() debug_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172#else
Ingo Molnar39c715b2005-06-21 17:14:34 -0700173# define smp_processor_id() raw_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174#endif
175
176#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
177#define put_cpu() preempt_enable()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178
Ingo Molnara1466492009-01-31 14:09:06 +0100179/*
180 * Callback to arch code if there's nosmp or maxcpus=0 on the
181 * boot command line:
182 */
183extern void arch_disable_smp_support(void);
184
Paul Gortmakerfb37bb02014-02-10 14:25:49 -0800185extern void arch_enable_nonboot_cpus_begin(void);
186extern void arch_enable_nonboot_cpus_end(void);
187
Andrew Morton033ab7f2006-06-30 01:55:50 -0700188void smp_setup_processor_id(void);
189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190#endif /* __LINUX_SMP_H */