1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Author: Huacai Chen <chenhuacai@loongson.cn>
4 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
5 */
6#ifndef __ASM_SMP_H
7#define __ASM_SMP_H
8
9#include <linux/atomic.h>
10#include <linux/bitops.h>
11#include <linux/linkage.h>
12#include <linux/threads.h>
13#include <linux/cpumask.h>
14
15extern int smp_num_siblings;
16extern int num_processors;
17extern int disabled_cpus;
18extern cpumask_t cpu_sibling_map[];
19extern cpumask_t cpu_core_map[];
20extern cpumask_t cpu_foreign_map[];
21
22void loongson_smp_setup(void);
23void loongson_prepare_cpus(unsigned int max_cpus);
24void loongson_boot_secondary(int cpu, struct task_struct *idle);
25void loongson_init_secondary(void);
26void loongson_smp_finish(void);
27void loongson_send_ipi_single(int cpu, unsigned int action);
28void loongson_send_ipi_mask(const struct cpumask *mask, unsigned int action);
29#ifdef CONFIG_HOTPLUG_CPU
30int loongson_cpu_disable(void);
31void loongson_cpu_die(unsigned int cpu);
32#endif
33
34static inline void plat_smp_setup(void)
35{
36	loongson_smp_setup();
37}
38
39static inline int raw_smp_processor_id(void)
40{
41#if defined(__VDSO__)
42	extern int vdso_smp_processor_id(void)
43		__compiletime_error("VDSO should not call smp_processor_id()");
44	return vdso_smp_processor_id();
45#else
46	return current_thread_info()->cpu;
47#endif
48}
49#define raw_smp_processor_id raw_smp_processor_id
50
51/* Map from cpu id to sequential logical cpu number.  This will only
52 * not be idempotent when cpus failed to come on-line.	*/
53extern int __cpu_number_map[NR_CPUS];
54#define cpu_number_map(cpu)  __cpu_number_map[cpu]
55
56/* The reverse map from sequential logical cpu number to cpu id.  */
57extern int __cpu_logical_map[NR_CPUS];
58#define cpu_logical_map(cpu)  __cpu_logical_map[cpu]
59
60#define cpu_physical_id(cpu)	cpu_logical_map(cpu)
61
62#define SMP_BOOT_CPU		0x1
63#define SMP_RESCHEDULE		0x2
64#define SMP_CALL_FUNCTION	0x4
65
66struct secondary_data {
67	unsigned long stack;
68	unsigned long thread_info;
69};
70extern struct secondary_data cpuboot_data;
71
72extern asmlinkage void smpboot_entry(void);
73extern asmlinkage void start_secondary(void);
74
75extern void calculate_cpu_foreign_map(void);
76
77/*
78 * Generate IPI list text
79 */
80extern void show_ipi_list(struct seq_file *p, int prec);
81
82static inline void arch_send_call_function_single_ipi(int cpu)
83{
84	loongson_send_ipi_single(cpu, SMP_CALL_FUNCTION);
85}
86
87static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
88{
89	loongson_send_ipi_mask(mask, SMP_CALL_FUNCTION);
90}
91
92#ifdef CONFIG_HOTPLUG_CPU
93static inline int __cpu_disable(void)
94{
95	return loongson_cpu_disable();
96}
97
98static inline void __cpu_die(unsigned int cpu)
99{
100	loongson_cpu_die(cpu);
101}
102#endif
103
104#endif /* __ASM_SMP_H */
105