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_llc_shared_map[]; 29 extern cpumask_t cpu_core_map[]; 30 extern cpumask_t cpu_foreign_map[]; 31 32 void loongson_smp_setup(void); 33 void loongson_prepare_cpus(unsigned int max_cpus); 34 void loongson_boot_secondary(int cpu, struct task_struct *idle); 35 void loongson_init_secondary(void); 36 void loongson_smp_finish(void); 37 #ifdef CONFIG_HOTPLUG_CPU 38 int loongson_cpu_disable(void); 39 void loongson_cpu_die(unsigned int cpu); 40 #endif 41 42 static inline void __init plat_smp_setup(void) 43 { 44 loongson_smp_setup(); 45 } 46 47 static inline int raw_smp_processor_id(void) 48 { 49 #if defined(__VDSO__) 50 extern int vdso_smp_processor_id(void) 51 __compiletime_error("VDSO should not call smp_processor_id()"); 52 return vdso_smp_processor_id(); 53 #else 54 return current_thread_info()->cpu; 55 #endif 56 } 57 #define raw_smp_processor_id raw_smp_processor_id 58 59 /* Map from cpu id to sequential logical cpu number. This will only 60 * not be idempotent when cpus failed to come on-line. */ 61 extern int __cpu_number_map[NR_CPUS]; 62 #define cpu_number_map(cpu) __cpu_number_map[cpu] 63 64 /* The reverse map from sequential logical cpu number to cpu id. */ 65 extern int __cpu_logical_map[NR_CPUS]; 66 #define cpu_logical_map(cpu) __cpu_logical_map[cpu] 67 68 #define cpu_physical_id(cpu) cpu_logical_map(cpu) 69 70 #define ACTION_BOOT_CPU 0 71 #define ACTION_RESCHEDULE 1 72 #define ACTION_CALL_FUNCTION 2 73 #define ACTION_IRQ_WORK 3 74 #define ACTION_CLEAR_VECTOR 4 75 #define SMP_BOOT_CPU BIT(ACTION_BOOT_CPU) 76 #define SMP_RESCHEDULE BIT(ACTION_RESCHEDULE) 77 #define SMP_CALL_FUNCTION BIT(ACTION_CALL_FUNCTION) 78 #define SMP_IRQ_WORK BIT(ACTION_IRQ_WORK) 79 #define SMP_CLEAR_VECTOR BIT(ACTION_CLEAR_VECTOR) 80 81 struct seq_file; 82 83 struct secondary_data { 84 unsigned long task; 85 unsigned long stack; 86 unsigned long offset; 87 }; 88 extern struct secondary_data cpuboot_data; 89 90 extern asmlinkage void smpboot_entry(void); 91 extern asmlinkage void start_secondary(void); 92 93 extern void calculate_cpu_foreign_map(void); 94 95 /* 96 * Generate IPI list text 97 */ 98 extern void show_ipi_list(struct seq_file *p, int prec); 99 100 static inline void arch_send_call_function_single_ipi(int cpu) 101 { 102 mp_ops.send_ipi_single(cpu, ACTION_CALL_FUNCTION); 103 } 104 105 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask) 106 { 107 mp_ops.send_ipi_mask(mask, ACTION_CALL_FUNCTION); 108 } 109 110 #ifdef CONFIG_HOTPLUG_CPU 111 static inline int __cpu_disable(void) 112 { 113 return loongson_cpu_disable(); 114 } 115 116 static inline void __cpu_die(unsigned int cpu) 117 { 118 loongson_cpu_die(cpu); 119 } 120 #endif 121 122 #else /* !CONFIG_SMP */ 123 #define cpu_logical_map(cpu) 0 124 #endif /* CONFIG_SMP */ 125 126 #endif /* __ASM_SMP_H */ 127