LXR linux/arch/arm/include/asm/smp.h

   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
  20struct seq_file;
  21
  22/*
  23 * generate IPI list text
  24 */
  25extern void show_ipi_list(struct seq_file *, int);
  26
  27/*
  28 * Called from assembly code, this handles an IPI.
  29 */
  30asmlinkage void do_IPI(int ipinr, struct pt_regs *regs);
  31
  32/*
  33 * Called from C code, this handles an IPI.
  34 */
  35void handle_IPI(int ipinr, struct pt_regs *regs);
  36
  37/*
  38 * Setup the set of possible CPUs (via set_cpu_possible)
  39 */
  40extern void smp_init_cpus(void);
  41
  42/*
  43 * Register IPI interrupts with the arch SMP code
  44 */
  45extern void set_smp_ipi_range(int ipi_base, int nr_ipi);
  46
  47/*
  48 * Called from platform specific assembly code, this is the
  49 * secondary CPU entry point.
  50 */
  51asmlinkage void secondary_start_kernel(void);
  52
  53
  54/*
  55 * Initial data for bringing up a secondary CPU.
  56 */
  57struct secondary_data {
  58        union {
  59                struct mpu_rgn_info *mpu_rgn_info;
  60                u64 pgdir;
  61        };
  62        unsigned long swapper_pg_dir;
  63        void *stack;
  64};
  65extern struct secondary_data secondary_data;
  66extern void secondary_startup(void);
  67extern void secondary_startup_arm(void);
  68
  69extern int __cpu_disable(void);
  70
  71extern void __cpu_die(unsigned int cpu);
  72
  73extern void arch_send_call_function_single_ipi(int cpu);
  74extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  75extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
  76
  77extern int register_ipi_completion(struct completion *completion, int cpu);
  78
  79struct smp_operations {
  80#ifdef CONFIG_SMP
  81        /*
  82         * Setup the set of possible CPUs (via set_cpu_possible)
  83         */
  84        void (*smp_init_cpus)(void);
  85        /*
  86         * Initialize cpu_possible map, and enable coherency
  87         */
  88        void (*smp_prepare_cpus)(unsigned int max_cpus);
  89
  90        /*
  91         * Perform platform specific initialisation of the specified CPU.
  92         */
  93        void (*smp_secondary_init)(unsigned int cpu);
  94        /*
  95         * Boot a secondary CPU, and assign it the specified idle task.
  96         * This also gives us the initial stack to use for this CPU.
  97         */
  98        int  (*smp_boot_secondary)(unsigned int cpu, struct task_struct *idle);
  99#ifdef CONFIG_HOTPLUG_CPU
 100        int  (*cpu_kill)(unsigned int cpu);
 101        void (*cpu_die)(unsigned int cpu);
 102        bool  (*cpu_can_disable)(unsigned int cpu);
 103        int  (*cpu_disable)(unsigned int cpu);
 104#endif
 105#endif
 106};
 107
 108struct of_cpu_method {
 109        const char *method;
 110        const struct smp_operations *ops;
 111};
 112
 113#define CPU_METHOD_OF_DECLARE(name, _method, _ops)                      \
 114        static const struct of_cpu_method __cpu_method_of_table_##name  \
 115                __used __section("__cpu_method_of_table")               \
 116                = { .method = _method, .ops = _ops }
 117/*
 118 * set platform specific SMP operations
 119 */
 120extern void smp_set_ops(const struct smp_operations *);
 121
 122#endif /* ifndef __ASM_ARM_SMP_H */
 123