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 static inline 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
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