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1#ifndef __LINUX_SMP_H
2#define __LINUX_SMP_H
3
4/*
5 * Generic SMP support
6 * Alan Cox. <alan@redhat.com>
7 */
8
9#include <linux/errno.h>
10#include <linux/types.h>
11#include <linux/list.h>
12#include <linux/cpumask.h>
13
14extern void cpu_idle(void);
15
16struct call_single_data {
17 struct list_head list;
18 void (*func) (void *info);
19 void *info;
20 u16 flags;
21 u16 priv;
22};
23
24/* total number of cpus in this system (may exceed NR_CPUS) */
25extern unsigned int total_cpus;
26
27int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
28 int wait);
29
30#ifdef CONFIG_SMP
31
32#include <linux/preempt.h>
33#include <linux/kernel.h>
34#include <linux/compiler.h>
35#include <linux/thread_info.h>
36#include <asm/smp.h>
37
38/*
39 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
40 * (defined in asm header):
41 */
42
43/*
44 * stops all CPUs but the current one:
45 */
46extern void smp_send_stop(void);
47
48/*
49 * sends a 'reschedule' event to another CPU:
50 */
51extern void smp_send_reschedule(int cpu);
52
53
54/*
55 * Prepare machine for booting other CPUs.
56 */
57extern void smp_prepare_cpus(unsigned int max_cpus);
58
59/*
60 * Bring a CPU up
61 */
62extern int __cpu_up(unsigned int cpunum);
63
64/*
65 * Final polishing of CPUs
66 */
67extern void smp_cpus_done(unsigned int max_cpus);
68
69/*
70 * Call a function on all other processors
71 */
72int smp_call_function(void(*func)(void *info), void *info, int wait);
73void smp_call_function_many(const struct cpumask *mask,
74 void (*func)(void *info), void *info, bool wait);
75
76/* Deprecated: Use smp_call_function_many which takes a pointer to the mask. */
77static inline int
78smp_call_function_mask(cpumask_t mask, void(*func)(void *info), void *info,
79 int wait)
80{
81 smp_call_function_many(&mask, func, info, wait);
82 return 0;
83}
84
85void __smp_call_function_single(int cpuid, struct call_single_data *data,
86 int wait);
87
88/*
89 * Generic and arch helpers
90 */
91#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
92void generic_smp_call_function_single_interrupt(void);
93void generic_smp_call_function_interrupt(void);
94void ipi_call_lock(void);
95void ipi_call_unlock(void);
96void ipi_call_lock_irq(void);
97void ipi_call_unlock_irq(void);
98#endif
99
100/*
101 * Call a function on all processors
102 */
103int on_each_cpu(void (*func) (void *info), void *info, int wait);
104
105#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
106#define MSG_ALL 0x8001
107
108#define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
109#define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
110 * when rebooting
111 */
112#define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
113#define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
114
115/*
116 * Mark the boot cpu "online" so that it can call console drivers in
117 * printk() and can access its per-cpu storage.
118 */
119void smp_prepare_boot_cpu(void);
120
121extern unsigned int setup_max_cpus;
122
123#else /* !SMP */
124
125static inline void smp_send_stop(void) { }
126
127/*
128 * These macros fold the SMP functionality into a single CPU system
129 */
130#define raw_smp_processor_id() 0
131static inline int up_smp_call_function(void (*func)(void *), void *info)
132{
133 return 0;
134}
135#define smp_call_function(func, info, wait) \
136 (up_smp_call_function(func, info))
137#define on_each_cpu(func,info,wait) \
138 ({ \
139 local_irq_disable(); \
140 func(info); \
141 local_irq_enable(); \
142 0; \
143 })
144static inline void smp_send_reschedule(int cpu) { }
145#define num_booting_cpus() 1
146#define smp_prepare_boot_cpu() do {} while (0)
147#define smp_call_function_mask(mask, func, info, wait) \
148 (up_smp_call_function(func, info))
149#define smp_call_function_many(mask, func, info, wait) \
150 (up_smp_call_function(func, info))
151static inline void init_call_single_data(void)
152{
153}
154#endif /* !SMP */
155
156/*
157 * smp_processor_id(): get the current CPU ID.
158 *
159 * if DEBUG_PREEMPT is enabled the we check whether it is
160 * 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.)
163 *
164 * 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.
170 */
171#ifdef CONFIG_DEBUG_PREEMPT
172 extern unsigned int debug_smp_processor_id(void);
173# define smp_processor_id() debug_smp_processor_id()
174#else
175# define smp_processor_id() raw_smp_processor_id()
176#endif
177
178#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
179#define put_cpu() preempt_enable()
180#define put_cpu_no_resched() preempt_enable_no_resched()
181
182/*
183 * Callback to arch code if there's nosmp or maxcpus=0 on the
184 * boot command line:
185 */
186extern void arch_disable_smp_support(void);
187
188void smp_setup_processor_id(void);
189
190#endif /* __LINUX_SMP_H */