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