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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>
Andrew Morton3b8967d2013-09-11 14:19:37 -070014#include <linux/irqflags.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 {
20 struct list_head list;
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
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 */
Thomas Gleixner8239c252012-04-20 13:05:42 +000064extern int __cpu_up(unsigned int cpunum, struct task_struct *tidle);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065
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
Thomas Gleixnerf37f4352012-05-07 17:59:48 +000084void kick_all_cpus_sync(void);
85
Jens Axboe3d442232008-06-26 11:21:34 +020086/*
87 * Generic and arch helpers
88 */
89#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
Takao Indohd8ad7d12011-03-29 12:35:04 -040090void __init call_function_init(void);
Jens Axboe3d442232008-06-26 11:21:34 +020091void generic_smp_call_function_single_interrupt(void);
Shaohua Li9a46ad62013-02-21 16:43:03 -080092#define generic_smp_call_function_interrupt \
93 generic_smp_call_function_single_interrupt
Takao Indohd8ad7d12011-03-29 12:35:04 -040094#else
95static inline void call_function_init(void) { }
Jens Axboe3d442232008-06-26 11:21:34 +020096#endif
Andrew Mortona3bc0db2006-09-25 23:32:33 -070097
Linus Torvalds1da177e2005-04-16 15:20:36 -070098/*
99 * Call a function on all processors
100 */
David Howells3a5f65d2010-10-27 17:28:36 +0100101int on_each_cpu(smp_call_func_t func, void *info, int wait);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103/*
Gilad Ben-Yossef3fc498f2012-03-28 14:42:43 -0700104 * Call a function on processors specified by mask, which might include
105 * the local one.
106 */
107void on_each_cpu_mask(const struct cpumask *mask, smp_call_func_t func,
108 void *info, bool wait);
109
110/*
Gilad Ben-Yossefb3a7e982012-03-28 14:42:43 -0700111 * Call a function on each processor for which the supplied function
112 * cond_func returns a positive value. This may include the local
113 * processor.
114 */
115void on_each_cpu_cond(bool (*cond_func)(int cpu, void *info),
116 smp_call_func_t func, void *info, bool wait,
117 gfp_t gfp_flags);
118
119/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 * Mark the boot cpu "online" so that it can call console drivers in
121 * printk() and can access its per-cpu storage.
122 */
123void smp_prepare_boot_cpu(void);
124
Andi Kleenca74a6f2008-01-30 13:33:17 +0100125extern unsigned int setup_max_cpus;
Amerigo Wang34db18a02011-03-22 16:34:06 -0700126extern void __init setup_nr_cpu_ids(void);
127extern void __init smp_init(void);
Andi Kleenca74a6f2008-01-30 13:33:17 +0100128
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129#else /* !SMP */
130
Ingo Molnard1dedb52009-03-13 11:14:06 +0100131static inline void smp_send_stop(void) { }
132
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133/*
134 * These macros fold the SMP functionality into a single CPU system
135 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700136#define raw_smp_processor_id() 0
David Howells3a5f65d2010-10-27 17:28:36 +0100137static inline int up_smp_call_function(smp_call_func_t func, void *info)
Con Kolivas3c30b062006-03-26 01:37:19 -0800138{
139 return 0;
140}
Jens Axboe8691e5a2008-06-06 11:18:06 +0200141#define smp_call_function(func, info, wait) \
Ingo Molnara5fbb6d2007-11-09 22:39:38 +0100142 (up_smp_call_function(func, info))
Andrew Morton3b8967d2013-09-11 14:19:37 -0700143
144static inline int on_each_cpu(smp_call_func_t func, void *info, int wait)
145{
146 unsigned long flags;
147
148 local_irq_save(flags);
149 func(info);
150 local_irq_restore(flags);
151 return 0;
152}
153
Gilad Ben-Yossef3fc498f2012-03-28 14:42:43 -0700154/*
155 * Note we still need to test the mask even for UP
156 * because we actually can get an empty mask from
157 * code that on SMP might call us without the local
158 * CPU in the mask.
159 */
160#define on_each_cpu_mask(mask, func, info, wait) \
161 do { \
162 if (cpumask_test_cpu(0, (mask))) { \
163 local_irq_disable(); \
164 (func)(info); \
165 local_irq_enable(); \
166 } \
167 } while (0)
Gilad Ben-Yossefb3a7e982012-03-28 14:42:43 -0700168/*
169 * Preemption is disabled here to make sure the cond_func is called under the
170 * same condtions in UP and SMP.
171 */
172#define on_each_cpu_cond(cond_func, func, info, wait, gfp_flags)\
173 do { \
174 void *__info = (info); \
175 preempt_disable(); \
176 if ((cond_func)(0, __info)) { \
177 local_irq_disable(); \
178 (func)(__info); \
179 local_irq_enable(); \
180 } \
181 preempt_enable(); \
182 } while (0)
Gilad Ben-Yossef3fc498f2012-03-28 14:42:43 -0700183
Richard Henderson79a88102005-07-28 01:07:41 -0700184static inline void smp_send_reschedule(int cpu) { }
Linus Torvalds2ac66082005-07-28 10:34:47 -0700185#define smp_prepare_boot_cpu() do {} while (0)
Rusty Russelld2ff9112008-12-15 19:04:35 +1030186#define smp_call_function_many(mask, func, info, wait) \
187 (up_smp_call_function(func, info))
Takao Indohd8ad7d12011-03-29 12:35:04 -0400188static inline void call_function_init(void) { }
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800189
190static inline int
David Howells3a5f65d2010-10-27 17:28:36 +0100191smp_call_function_any(const struct cpumask *mask, smp_call_func_t func,
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800192 void *info, int wait)
Jens Axboe3d442232008-06-26 11:21:34 +0200193{
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800194 return smp_call_function_single(0, func, info, wait);
Jens Axboe3d442232008-06-26 11:21:34 +0200195}
Rusty Russell2ea6dec2009-11-17 14:27:27 -0800196
Thomas Gleixnerf37f4352012-05-07 17:59:48 +0000197static inline void kick_all_cpus_sync(void) { }
198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199#endif /* !SMP */
200
201/*
Ingo Molnar39c715b2005-06-21 17:14:34 -0700202 * smp_processor_id(): get the current CPU ID.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 *
Rakib Mullickcfd8d6c2010-03-05 13:42:45 -0800204 * if DEBUG_PREEMPT is enabled then we check whether it is
Ingo Molnar39c715b2005-06-21 17:14:34 -0700205 * used in a preemption-safe way. (smp_processor_id() is safe
206 * if it's used in a preemption-off critical section, or in
207 * a thread that is bound to the current CPU.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 *
Ingo Molnar39c715b2005-06-21 17:14:34 -0700209 * NOTE: raw_smp_processor_id() is for internal use only
210 * (smp_processor_id() is the preferred variant), but in rare
211 * instances it might also be used to turn off false positives
212 * (i.e. smp_processor_id() use that the debugging code reports but
213 * which use for some reason is legal). Don't use this to hack around
214 * the warning message, as your code might not work under PREEMPT.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 */
Ingo Molnar39c715b2005-06-21 17:14:34 -0700216#ifdef CONFIG_DEBUG_PREEMPT
217 extern unsigned int debug_smp_processor_id(void);
218# define smp_processor_id() debug_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219#else
Ingo Molnar39c715b2005-06-21 17:14:34 -0700220# define smp_processor_id() raw_smp_processor_id()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221#endif
222
223#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
224#define put_cpu() preempt_enable()
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Ingo Molnara1466492009-01-31 14:09:06 +0100226/*
227 * Callback to arch code if there's nosmp or maxcpus=0 on the
228 * boot command line:
229 */
230extern void arch_disable_smp_support(void);
231
Andrew Morton033ab7f2006-06-30 01:55:50 -0700232void smp_setup_processor_id(void);
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234#endif /* __LINUX_SMP_H */