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