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 
20 struct seq_file;
21 
22 /*
23  * generate IPI list text
24  */
25 extern void show_ipi_list(struct seq_file *, int);
26 
27 /*
28  * Called from C code, this handles an IPI.
29  */
30 void handle_IPI(int ipinr, struct pt_regs *regs);
31 
32 /*
33  * Setup the set of possible CPUs (via set_cpu_possible)
34  */
35 extern void smp_init_cpus(void);
36 
37 /*
38  * Register IPI interrupts with the arch SMP code
39  */
40 extern 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  */
46 asmlinkage void secondary_start_kernel(struct task_struct *task);
47 
48 
49 /*
50  * Initial data for bringing up a secondary CPU.
51  */
52 struct 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 };
61 extern struct secondary_data secondary_data;
62 extern void secondary_startup(void);
63 extern void secondary_startup_arm(void);
64 
65 extern int __cpu_disable(void);
66 
67 extern void __cpu_die(unsigned int cpu);
68 
69 extern void arch_send_call_function_single_ipi(int cpu);
70 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
71 extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
72 
73 extern int register_ipi_completion(struct completion *completion, int cpu);
74 
75 struct 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 
104 struct 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  */
116 extern void smp_set_ops(const struct smp_operations *);
117 
118 #endif /* ifndef __ASM_ARM_SMP_H */
119