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Linux/arch/arm/include/asm/smp.h

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  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 

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