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 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  * Register IPI interrupts with the arch SMP code
  44  */
  45 extern 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  */
  51 asmlinkage void secondary_start_kernel(void);
  52
  53
  54 /*
  55  * Initial data for bringing up a secondary CPU.
  56  */
  57 struct 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 };
  65 extern struct secondary_data secondary_data;
  66 extern void secondary_startup(void);
  67 extern void secondary_startup_arm(void);
  68
  69 extern int __cpu_disable(void);
  70
  71 extern void __cpu_die(unsigned int cpu);
  72
  73 extern void arch_send_call_function_single_ipi(int cpu);
  74 extern void arch_send_call_function_ipi_mask(const struct cpumask *mask);
  75 extern void arch_send_wakeup_ipi_mask(const struct cpumask *mask);
  76
  77 extern int register_ipi_completion(struct completion *completion, int cpu);
  78
  79 struct 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
 108 struct 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  */
 120 extern void smp_set_ops(const struct smp_operations *);
 121
 122 #endif /* ifndef __ASM_ARM_SMP_H */