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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;
Linus Torvaldsf4d03bd2015-04-20 09:08:49 -070021 unsigned int 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);
Chuansheng Liuc6f44592014-09-04 15:17:54 +0800103void wake_up_all_idle_cpus(void);
Thomas Gleixnerf37f4352012-05-07 17:59:48 +0000104
Jens Axboe3d442232008-06-26 11:21:34 +0200105/*
106 * Generic and arch helpers
107 */
Takao Indohd8ad7d12011-03-29 12:35:04 -0400108void __init call_function_init(void);
Jens Axboe3d442232008-06-26 11:21:34 +0200109void generic_smp_call_function_single_interrupt(void);
Shaohua Li9a46ad62013-02-21 16:43:03 -0800110#define generic_smp_call_function_interrupt \
111 generic_smp_call_function_single_interrupt
Andrew Mortona3bc0db2006-09-25 23:32:33 -0700112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 * Mark the boot cpu "online" so that it can call console drivers in
115 * printk() and can access its per-cpu storage.
116 */
117void smp_prepare_boot_cpu(void);
118
Andi Kleenca74a6f2008-01-30 13:33:17 +0100119extern unsigned int setup_max_cpus;
Amerigo Wang34db18a02011-03-22 16:34:06 -0700120extern void __init setup_nr_cpu_ids(void);
121extern void __init smp_init(void);
Andi Kleenca74a6f2008-01-30 13:33:17 +0100122
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123#else /* !SMP */
124
Ingo Molnard1dedb52009-03-13 11:14:06 +0100125static inline void smp_send_stop(void) { }
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127/*
128 * These macros fold the SMP functionality into a single CPU system
129 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700130#define raw_smp_processor_id() 0
David Howells3a5f65d2010-10-27 17:28:36 +0100131static inline int up_smp_call_function(smp_call_func_t func, void *info)
Con Kolivas3c30b062006-03-26 01:37:19 -0800132{
133 return 0;
134}
Jens Axboe8691e5a2008-06-06 11:18:06 +0200135#define smp_call_function(func, info, wait) \
Ingo Molnara5fbb6d2007-11-09 22:39:38 +0100136 (up_smp_call_function(func, info))
Andrew Morton3b8967d2013-09-11 14:19:37 -0700137
Richard Henderson79a88102005-07-28 01:07:41 -0700138static inline void smp_send_reschedule(int cpu) { }
Linus Torvalds2ac66082005-07-28 10:34:47 -0700139#define smp_prepare_boot_cpu() do {} while (0)
Rusty Russelld2ff9112008-12-15 19:04:35 +1030140#define smp_call_function_many(mask, func, info, wait) \
141 (up_smp_call_function(func, info))
Takao Indohd8ad7d12011-03-29 12:35:04 -0400142static inline void call_function_init(void) { }
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800143
144static inline int
David Howells3a5f65d2010-10-27 17:28:36 +0100145smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800146 void *info, int wait)
Jens Axboe3d442232008-06-26 11:21:34 +0200147{
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800148 return smp_call_function_single(0, func, info, wait);
Jens Axboe3d442232008-06-26 11:21:34 +0200149}
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800150
Thomas Gleixnerf37f4352012-05-07 17:59:48 +0000151static inline void kick_all_cpus_sync(void) { }
Chuansheng Liuc6f44592014-09-04 15:17:54 +0800152static inline void wake_up_all_idle_cpus(void) { }
Thomas Gleixnerf37f4352012-05-07 17:59:48 +0000153
Thomas Gleixner30b8b002015-01-15 21:22:39 +0000154#ifdef CONFIG_UP_LATE_INIT
155extern void __init up_late_init(void);
156static inline void smp_init(void) { up_late_init(); }
157#else
158static inline void smp_init(void) { }
159#endif
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161#endif /* !SMP */
162
163/*
Ingo Molnar39c715b2005-06-21 17:14:34 -0700164 * smp_processor_id(): get the current CPU ID.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 *
Rakib Mullickcfd8d6c2010-03-05 13:42:45 -0800166 * if DEBUG_PREEMPT is enabled then we check whether it is
Ingo Molnar39c715b2005-06-21 17:14:34 -0700167 * used in a preemption-safe way. (smp_processor_id() is safe
168 * if it's used in a preemption-off critical section, or in
169 * a thread that is bound to the current CPU.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 *
Ingo Molnar39c715b2005-06-21 17:14:34 -0700171 * NOTE: raw_smp_processor_id() is for internal use only
172 * (smp_processor_id() is the preferred variant), but in rare
173 * instances it might also be used to turn off false positives
174 * (i.e. smp_processor_id() use that the debugging code reports but
175 * which use for some reason is legal). Don't use this to hack around
176 * the warning message, as your code might not work under PREEMPT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700178#ifdef CONFIG_DEBUG_PREEMPT
179 extern unsigned int debug_smp_processor_id(void);
180# define smp_processor_id() debug_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181#else
Ingo Molnar39c715b2005-06-21 17:14:34 -0700182# define smp_processor_id() raw_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183#endif
184
185#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
186#define put_cpu() preempt_enable()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187
Ingo Molnara1466492009-01-31 14:09:06 +0100188/*
189 * Callback to arch code if there's nosmp or maxcpus=0 on the
190 * boot command line:
191 */
192extern void arch_disable_smp_support(void);
193
Paul Gortmakerfb37bb02014-02-10 14:25:49 -0800194extern void arch_enable_nonboot_cpus_begin(void);
195extern void arch_enable_nonboot_cpus_end(void);
196
Andrew Morton033ab7f2006-06-30 01:55:50 -0700197void smp_setup_processor_id(void);
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199#endif /* __LINUX_SMP_H */