Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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
11extern void cpu_idle(void);
12
13#ifdef CONFIG_SMP
14
15#include <linux/preempt.h>
16#include <linux/kernel.h>
17#include <linux/compiler.h>
18#include <linux/thread_info.h>
19#include <asm/smp.h>
20
21/*
22 * main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
23 * (defined in asm header):
24 */
25
26/*
27 * stops all CPUs but the current one:
28 */
29extern void smp_send_stop(void);
30
31/*
32 * sends a 'reschedule' event to another CPU:
33 */
34extern void smp_send_reschedule(int cpu);
35
36
37/*
38 * Prepare machine for booting other CPUs.
39 */
40extern void smp_prepare_cpus(unsigned int max_cpus);
41
42/*
43 * Bring a CPU up
44 */
45extern int __cpu_up(unsigned int cpunum);
46
47/*
48 * Final polishing of CPUs
49 */
50extern void smp_cpus_done(unsigned int max_cpus);
51
52/*
53 * Call a function on all other processors
54 */
55int smp_call_function(void(*func)(void *info), void *info, int retry, int wait);
56
57int smp_call_function_single(int cpuid, void (*func) (void *info), void *info,
58 int retry, int wait);
59
60/*
61 * Call a function on all processors
62 */
63int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait);
64
65#define MSG_ALL_BUT_SELF 0x8000 /* Assume <32768 CPU's */
66#define MSG_ALL 0x8001
67
68#define MSG_INVALIDATE_TLB 0x0001 /* Remote processor TLB invalidate */
69#define MSG_STOP_CPU 0x0002 /* Sent to shut down slave CPU's
70 * when rebooting
71 */
72#define MSG_RESCHEDULE 0x0003 /* Reschedule request from master CPU*/
73#define MSG_CALL_FUNCTION 0x0004 /* Call function on all other CPUs */
74
75/*
76 * Mark the boot cpu "online" so that it can call console drivers in
77 * printk() and can access its per-cpu storage.
78 */
79void smp_prepare_boot_cpu(void);
80
81#else /* !SMP */
82
83/*
84 * These macros fold the SMP functionality into a single CPU system
85 */
86#define raw_smp_processor_id() 0
87static inline int up_smp_call_function(void (*func)(void *), void *info)
88{
89 return 0;
90}
91#define smp_call_function(func, info, retry, wait) \
92 (up_smp_call_function(func, info))
93#define on_each_cpu(func,info,retry,wait) \
94 ({ \
95 local_irq_disable(); \
96 func(info); \
97 local_irq_enable(); \
98 0; \
99 })
100static inline void smp_send_reschedule(int cpu) { }
101#define num_booting_cpus() 1
102#define smp_prepare_boot_cpu() do {} while (0)
103#define smp_call_function_single(cpuid, func, info, retry, wait) \
104({ \
105 WARN_ON(cpuid != 0); \
106 local_irq_disable(); \
107 (func)(info); \
108 local_irq_enable(); \
109 0; \
110})
111#define smp_call_function_mask(mask, func, info, wait) \
112 (up_smp_call_function(func, info))
113
114#endif /* !SMP */
115
116/*
117 * smp_processor_id(): get the current CPU ID.
118 *
119 * if DEBUG_PREEMPT is enabled the we check whether it is
120 * used in a preemption-safe way. (smp_processor_id() is safe
121 * if it's used in a preemption-off critical section, or in
122 * a thread that is bound to the current CPU.)
123 *
124 * NOTE: raw_smp_processor_id() is for internal use only
125 * (smp_processor_id() is the preferred variant), but in rare
126 * instances it might also be used to turn off false positives
127 * (i.e. smp_processor_id() use that the debugging code reports but
128 * which use for some reason is legal). Don't use this to hack around
129 * the warning message, as your code might not work under PREEMPT.
130 */
131#ifdef CONFIG_DEBUG_PREEMPT
132 extern unsigned int debug_smp_processor_id(void);
133# define smp_processor_id() debug_smp_processor_id()
134#else
135# define smp_processor_id() raw_smp_processor_id()
136#endif
137
138#define get_cpu() ({ preempt_disable(); smp_processor_id(); })
139#define put_cpu() preempt_enable()
140#define put_cpu_no_resched() preempt_enable_no_resched()
141
142void smp_setup_processor_id(void);
143
144#endif /* __LINUX_SMP_H */