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 C code, this handles an IPI.
29 */
30void handle_IPI(int ipinr, struct pt_regs *regs);
31
32/*
33 * Setup the set of possible CPUs (via set_cpu_possible)
34 */
35extern void smp_init_cpus(void);
36
37/*
38 * Register IPI interrupts with the arch SMP code
39 */
40extern void set_smp_ipi_range(int ipi_base, int nr_ipi);
41
42/*
43 * Called from platform specific assembly code, this is the
44 * secondary CPU entry point.
45 */
46asmlinkage void secondary_start_kernel(struct task_struct *task);
47
48
49/*
50 * Initial data for bringing up a secondary CPU.
51 */
52struct secondary_data {
53	union {
54		struct mpu_rgn_info *mpu_rgn_info;
55		u64 pgdir;
56	};
57	unsigned long swapper_pg_dir;
58	void *stack;
59	struct task_struct *task;
60};
61extern struct secondary_data secondary_data;
62extern void secondary_startup(void);
63extern void secondary_startup_arm(void);
64
65extern int __cpu_disable(void);
66
67static inline void __cpu_die(unsigned int cpu) { }
68
69extern void arch_send_call_function_single_ipi(int cpu);
70extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
71extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
72
73extern int register_ipi_completion(struct completion *completion, int cpu);
74
75struct smp_operations {
76#ifdef CONFIG_SMP
77	/*
78	 * Setup the set of possible CPUs (via set_cpu_possible)
79	 */
80	void (*smp_init_cpus)(void);
81	/*
82	 * Initialize cpu_possible map, and enable coherency
83	 */
84	void (*smp_prepare_cpus)(unsigned int max_cpus);
85
86	/*
87	 * Perform platform specific initialisation of the specified CPU.
88	 */
89	void (*smp_secondary_init)(unsigned int cpu);
90	/*
91	 * Boot a secondary CPU, and assign it the specified idle task.
92	 * This also gives us the initial stack to use for this CPU.
93	 */
94	int  (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
95#ifdef CONFIG_HOTPLUG_CPU
96	int  (*cpu_kill)(unsigned int cpu);
97	void (*cpu_die)(unsigned int cpu);
98	bool  (*cpu_can_disable)(unsigned int cpu);
99	int  (*cpu_disable)(unsigned int cpu);
100#endif
101#endif
102};
103
104struct of_cpu_method {
105	const char *method;
106	const struct smp_operations *ops;
107};
108
109#define CPU_METHOD_OF_DECLARE(name, _method, _ops)			\
110	static const struct of_cpu_method __cpu_method_of_table_##name	\
111		__used __section("__cpu_method_of_table")		\
112		= { .method = _method, .ops = _ops }
113/*
114 * set platform specific SMP operations
115 */
116extern void smp_set_ops(const struct smp_operations *);
117
118#endif /* ifndef __ASM_ARM_SMP_H */
119