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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * arch/arm/include/asm/smp.h
4 *
5 * Copyright (C) 2004-2005 ARM Ltd.
6 */
7#ifndef __ASM_ARM_SMP_H
8#define __ASM_ARM_SMP_H
9
10#include <linux/threads.h>
11#include <linux/cpumask.h>
12#include <linux/thread_info.h>
13
14#ifndef CONFIG_SMP
15# error "<asm/smp.h> included in non-SMP build"
16#endif
17
18#define raw_smp_processor_id() (current_thread_info()->cpu)
19
20struct seq_file;
21
22/*
23 * generate IPI list text
24 */
25extern void show_ipi_list(struct seq_file *, int);
26
27/*
28 * Called from assembly code, this handles an IPI.
29 */
30asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
31
32/*
33 * Called from C code, this handles an IPI.
34 */
35void handle_IPI(int ipinr, struct pt_regs *regs);
36
37/*
38 * Setup the set of possible CPUs (via set_cpu_possible)
39 */
40extern void smp_init_cpus(void);
41
42
43/*
44 * Provide a function to raise an IPI cross call on CPUs in callmap.
45 */
46extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int));
47
48/*
49 * Called from platform specific assembly code, this is the
50 * secondary CPU entry point.
51 */
52asmlinkage void secondary_start_kernel(void);
53
54
55/*
56 * Initial data for bringing up a secondary CPU.
57 */
58struct secondary_data {
59 union {
60 struct mpu_rgn_info *mpu_rgn_info;
61 u64 pgdir;
62 };
63 unsigned long swapper_pg_dir;
64 void *stack;
65};
66extern struct secondary_data secondary_data;
67extern void secondary_startup(void);
68extern void secondary_startup_arm(void);
69
70extern int __cpu_disable(void);
71
72extern void __cpu_die(unsigned int cpu);
73
74extern void arch_send_call_function_single_ipi(int cpu);
75extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
76extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
77
78extern int register_ipi_completion(struct completion *completion, int cpu);
79
80struct smp_operations {
81#ifdef CONFIG_SMP
82 /*
83 * Setup the set of possible CPUs (via set_cpu_possible)
84 */
85 void (*smp_init_cpus)(void);
86 /*
87 * Initialize cpu_possible map, and enable coherency
88 */
89 void (*smp_prepare_cpus)(unsigned int max_cpus);
90
91 /*
92 * Perform platform specific initialisation of the specified CPU.
93 */
94 void (*smp_secondary_init)(unsigned int cpu);
95 /*
96 * Boot a secondary CPU, and assign it the specified idle task.
97 * This also gives us the initial stack to use for this CPU.
98 */
99 int (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
100#ifdef CONFIG_HOTPLUG_CPU
101 int (*cpu_kill)(unsigned int cpu);
102 void (*cpu_die)(unsigned int cpu);
103 bool (*cpu_can_disable)(unsigned int cpu);
104 int (*cpu_disable)(unsigned int cpu);
105#endif
106#endif
107};
108
109struct of_cpu_method {
110 const char *method;
111 const struct smp_operations *ops;
112};
113
114#define CPU_METHOD_OF_DECLARE(name, _method, _ops) \
115 static const struct of_cpu_method __cpu_method_of_table_##name \
116 __used __section(__cpu_method_of_table) \
117 = { .method = _method, .ops = _ops }
118/*
119 * set platform specific SMP operations
120 */
121extern void smp_set_ops(const struct smp_operations *);
122
123#endif /* ifndef __ASM_ARM_SMP_H */