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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
1/*
2 * This file is subject to the terms and conditions of the GNU General
3 * Public License. See the file "COPYING" in the main directory of this
4 * archive for more details.
5 *
6 * Copyright (C) 2000 - 2001 by Kanoj Sarcar (kanoj@sgi.com)
7 * Copyright (C) 2000 - 2001 by Silicon Graphics, Inc.
8 * Copyright (C) 2000, 2001, 2002 Ralf Baechle
9 * Copyright (C) 2000, 2001 Broadcom Corporation
10 */
11#ifndef __ASM_SMP_H
12#define __ASM_SMP_H
13
14#include <linux/bitops.h>
15#include <linux/linkage.h>
16#include <linux/smp.h>
17#include <linux/threads.h>
18#include <linux/cpumask.h>
19
20#include <linux/atomic.h>
21#include <asm/smp-ops.h>
22
23extern int smp_num_siblings;
24extern cpumask_t cpu_sibling_map[];
25extern cpumask_t cpu_core_map[];
26extern cpumask_t cpu_foreign_map[];
27
28static inline int raw_smp_processor_id(void)
29{
30#if defined(__VDSO__)
31 extern int vdso_smp_processor_id(void)
32 __compiletime_error("VDSO should not call smp_processor_id()");
33 return vdso_smp_processor_id();
34#else
35 return current_thread_info()->cpu;
36#endif
37}
38#define raw_smp_processor_id raw_smp_processor_id
39
40/* Map from cpu id to sequential logical cpu number. This will only
41 not be idempotent when cpus failed to come on-line. */
42extern int __cpu_number_map[CONFIG_MIPS_NR_CPU_NR_MAP];
43#define cpu_number_map(cpu) __cpu_number_map[cpu]
44
45/* The reverse map from sequential logical cpu number to cpu id. */
46extern int __cpu_logical_map[NR_CPUS];
47#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
48
49#define NO_PROC_ID (-1)
50
51#define SMP_RESCHEDULE_YOURSELF 0x1 /* XXX braindead */
52#define SMP_CALL_FUNCTION 0x2
53/* Octeon - Tell another core to flush its icache */
54#define SMP_ICACHE_FLUSH 0x4
55#define SMP_ASK_C0COUNT 0x8
56
57/* Mask of CPUs which are currently definitely operating coherently */
58extern cpumask_t cpu_coherent_mask;
59
60extern unsigned int smp_max_threads __initdata;
61
62extern asmlinkage void smp_bootstrap(void);
63
64extern void calculate_cpu_foreign_map(void);
65
66/*
67 * this function sends a 'reschedule' IPI to another CPU.
68 * it goes straight through and wastes no time serializing
69 * anything. Worst case is that we lose a reschedule ...
70 */
71static inline void arch_smp_send_reschedule(int cpu)
72{
73 extern const struct plat_smp_ops *mp_ops; /* private */
74
75 mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE_YOURSELF);
76}
77
78#ifdef CONFIG_HOTPLUG_CPU
79static inline int __cpu_disable(void)
80{
81 extern const struct plat_smp_ops *mp_ops; /* private */
82
83 return mp_ops->cpu_disable();
84}
85
86static inline void __cpu_die(unsigned int cpu)
87{
88 extern const struct plat_smp_ops *mp_ops; /* private */
89
90 mp_ops->cpu_die(cpu);
91}
92
93extern void __noreturn play_dead(void);
94#endif
95
96#ifdef CONFIG_KEXEC
97static inline void kexec_nonboot_cpu(void)
98{
99 extern const struct plat_smp_ops *mp_ops; /* private */
100
101 return mp_ops->kexec_nonboot_cpu();
102}
103
104static inline void *kexec_nonboot_cpu_func(void)
105{
106 extern const struct plat_smp_ops *mp_ops; /* private */
107
108 return mp_ops->kexec_nonboot_cpu;
109}
110#endif
111
112/*
113 * This function will set up the necessary IPIs for Linux to communicate
114 * with the CPUs in mask.
115 * Return 0 on success.
116 */
117int mips_smp_ipi_allocate(const struct cpumask *mask);
118
119/*
120 * This function will free up IPIs allocated with mips_smp_ipi_allocate to the
121 * CPUs in mask, which must be a subset of the IPIs that have been configured.
122 * Return 0 on success.
123 */
124int mips_smp_ipi_free(const struct cpumask *mask);
125
126static inline void arch_send_call_function_single_ipi(int cpu)
127{
128 extern const struct plat_smp_ops *mp_ops; /* private */
129
130 mp_ops->send_ipi_single(cpu, SMP_CALL_FUNCTION);
131}
132
133static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
134{
135 extern const struct plat_smp_ops *mp_ops; /* private */
136
137 mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
138}
139
140#endif /* __ASM_SMP_H */