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 assembly code, this handles an IPI. 29 */ 30 asmlinkage void do_IPI(int ipinr, struct pt_regs *regs); 31 32 /* 33 * Called from C code, this handles an IPI. 34 */ 35 void handle_IPI(int ipinr, struct pt_regs *regs); 36 37 /* 38 * Setup the set of possible CPUs (via set_cpu_possible) 39 */ 40 extern void smp_init_cpus(void); 41 42 43 /* 44 * Provide a function to raise an IPI cross call on CPUs in callmap. 45 */ 46 extern void set_smp_cross_call(void (*)(const struct cpumask *, unsigned int)); 47 48 /* 49 * Called from platform specific assembly code, this is the 50 * secondary CPU entry point. 51 */ 52 asmlinkage void secondary_start_kernel(void); 53 54 55 /* 56 * Initial data for bringing up a secondary CPU. 57 */ 58 struct secondary_data { 59 union { 60 struct mpu_rgn_info *mpu_rgn_info; 61 u64 pgdir; 62 }; 63 unsigned long swapper_pg_dir; 64 void *stack; 65 }; 66 extern struct secondary_data secondary_data; 67 extern void secondary_startup(void); 68 extern void secondary_startup_arm(void); 69 70 extern int __cpu_disable(void); 71 72 extern void __cpu_die(unsigned int cpu); 73 74 extern void arch_send_call_function_single_ipi(int cpu); 75 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask); 76 extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask); 77 78 extern int register_ipi_completion(struct completion *completion, int cpu); 79 80 struct smp_operations { 81 #ifdef CONFIG_SMP 82 /* 83 * Setup the set of possible CPUs (via set_cpu_possible) 84 */ 85 void (*smp_init_cpus)(void); 86 /* 87 * Initialize cpu_possible map, and enable coherency 88 */ 89 void (*smp_prepare_cpus)(unsigned int max_cpus); 90 91 /* 92 * Perform platform specific initialisation of the specified CPU. 93 */ 94 void (*smp_secondary_init)(unsigned int cpu); 95 /* 96 * Boot a secondary CPU, and assign it the specified idle task. 97 * This also gives us the initial stack to use for this CPU. 98 */ 99 int (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle); 100 #ifdef CONFIG_HOTPLUG_CPU 101 int (*cpu_kill)(unsigned int cpu); 102 void (*cpu_die)(unsigned int cpu); 103 bool (*cpu_can_disable)(unsigned int cpu); 104 int (*cpu_disable)(unsigned int cpu); 105 #endif 106 #endif 107 }; 108 109 struct of_cpu_method { 110 const char *method; 111 const struct smp_operations *ops; 112 }; 113 114 #define CPU_METHOD_OF_DECLARE(name, _method, _ops) \ 115 static const struct of_cpu_method __cpu_method_of_table_##name \ 116 __used __section(__cpu_method_of_table) \ 117 = { .method = _method, .ops = _ops } 118 /* 119 * set platform specific SMP operations 120 */ 121 extern void smp_set_ops(const struct smp_operations *); 122 123 #endif /* ifndef __ASM_ARM_SMP_H */ 124