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 #ifdef CONFIG_SMP
10
11 #include <linux/atomic.h>
12 #include <linux/bitops.h>
13 #include <linux/linkage.h>
14 #include <linux/threads.h>
15 #include <linux/cpumask.h>
16
17 struct smp_ops {
18 void (*init_ipi)(void);
19 void (*send_ipi_single)(int cpu, unsigned int action);
20 void (*send_ipi_mask)(const struct cpumask *mask, unsigned int action);
21 };
22 extern struct smp_ops mp_ops;
23
24 extern int smp_num_siblings;
25 extern int num_processors;
26 extern int disabled_cpus;
27 extern cpumask_t cpu_sibling_map[];
28 extern cpumask_t cpu_core_map[];
29 extern cpumask_t cpu_foreign_map[];
30
31 void loongson_smp_setup(void);
32 void loongson_prepare_cpus(unsigned int max_cpus);
33 void loongson_boot_secondary(int cpu, struct task_struct *idle);
34 void loongson_init_secondary(void);
35 void loongson_smp_finish(void);
36 #ifdef CONFIG_HOTPLUG_CPU
37 int loongson_cpu_disable(void);
38 void loongson_cpu_die(unsigned int cpu);
39 #endif
40
41 static inline void plat_smp_setup(void)
42 {
43 loongson_smp_setup();
44 }
45
46 static inline int raw_smp_processor_id(void)
47 {
48 #if defined(__VDSO__)
49 extern int vdso_smp_processor_id(void)
50 __compiletime_error("VDSO should not call smp_processor_id()");
51 return vdso_smp_processor_id();
52 #else
53 return current_thread_info()->cpu;
54 #endif
55 }
56 #define raw_smp_processor_id raw_smp_processor_id
57
58 /* Map from cpu id to sequential logical cpu number. This will only
59 * not be idempotent when cpus failed to come on-line. */
60 extern int __cpu_number_map[NR_CPUS];
61 #define cpu_number_map(cpu) __cpu_number_map[cpu]
62
63 /* The reverse map from sequential logical cpu number to cpu id. */
64 extern int __cpu_logical_map[NR_CPUS];
65 #define cpu_logical_map(cpu) __cpu_logical_map[cpu]
66
67 #define cpu_physical_id(cpu) cpu_logical_map(cpu)
68
69 #define ACTION_BOOT_CPU 0
70 #define ACTION_RESCHEDULE 1
71 #define ACTION_CALL_FUNCTION 2
72 #define ACTION_IRQ_WORK 3
73 #define SMP_BOOT_CPU BIT(ACTION_BOOT_CPU)
74 #define SMP_RESCHEDULE BIT(ACTION_RESCHEDULE)
75 #define SMP_CALL_FUNCTION BIT(ACTION_CALL_FUNCTION)
76 #define SMP_IRQ_WORK BIT(ACTION_IRQ_WORK)
77
78 struct secondary_data {
79 unsigned long stack;
80 unsigned long thread_info;
81 };
82 extern struct secondary_data cpuboot_data;
83
84 extern asmlinkage void smpboot_entry(void);
85 extern asmlinkage void start_secondary(void);
86
87 extern void calculate_cpu_foreign_map(void);
88
89 /*
90 * Generate IPI list text
91 */
92 extern void show_ipi_list(struct seq_file *p, int prec);
93
94 static inline void arch_send_call_function_single_ipi(int cpu)
95 {
96 mp_ops.send_ipi_single(cpu, ACTION_CALL_FUNCTION);
97 }
98
99 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
100 {
101 mp_ops.send_ipi_mask(mask, ACTION_CALL_FUNCTION);
102 }
103
104 #ifdef CONFIG_HOTPLUG_CPU
105 static inline int __cpu_disable(void)
106 {
107 return loongson_cpu_disable();
108 }
109
110 static inline void __cpu_die(unsigned int cpu)
111 {
112 loongson_cpu_die(cpu);
113 }
114 #endif
115
116 #else /* !CONFIG_SMP */
117 #define cpu_logical_map(cpu) 0
118 #endif /* CONFIG_SMP */
119
120 #endif /* __ASM_SMP_H */
121
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