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143 lines
3.3 KiB
C
143 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Author: Huacai Chen <chenhuacai@loongson.cn>
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* Copyright (C) 2020 Loongson Technology Corporation Limited
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*/
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#ifndef __ASM_SMP_H
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#define __ASM_SMP_H
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#include <linux/atomic.h>
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#include <linux/bitops.h>
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#include <linux/linkage.h>
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#include <linux/smp.h>
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#include <linux/threads.h>
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#include <linux/cpumask.h>
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#ifdef CONFIG_SMP
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struct task_struct;
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struct plat_smp_ops {
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void (*send_ipi_single)(int cpu, unsigned int action);
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void (*send_ipi_mask)(const struct cpumask *mask, unsigned int action);
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void (*smp_setup)(void);
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void (*prepare_cpus)(unsigned int max_cpus);
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int (*boot_secondary)(int cpu, struct task_struct *idle);
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void (*init_secondary)(void);
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void (*smp_finish)(void);
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#ifdef CONFIG_HOTPLUG_CPU
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int (*cpu_disable)(void);
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void (*cpu_die)(unsigned int cpu);
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#endif
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};
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extern const struct plat_smp_ops *mp_ops;
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void register_smp_ops(const struct plat_smp_ops *ops);
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static inline void plat_smp_setup(void)
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{
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mp_ops->smp_setup();
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}
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static inline int raw_smp_processor_id(void)
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{
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#if defined(__VDSO__)
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extern int vdso_smp_processor_id(void)
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__compiletime_error("VDSO should not call smp_processor_id()");
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return vdso_smp_processor_id();
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#else
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return current_thread_info()->cpu;
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#endif
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}
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#define raw_smp_processor_id raw_smp_processor_id
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#else /* !CONFIG_SMP */
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struct plat_smp_ops;
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static inline void plat_smp_setup(void)
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{
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/* UP, nothing to do ... */
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}
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static inline void register_smp_ops(const struct plat_smp_ops *ops)
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{
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}
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#endif /* !CONFIG_SMP */
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extern int smp_num_siblings;
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extern int num_processors;
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extern int disabled_cpus;
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extern cpumask_t cpu_sibling_map[];
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extern cpumask_t cpu_core_map[];
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extern cpumask_t cpu_foreign_map[];
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/* Map from cpu id to sequential logical cpu number. This will only
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not be idempotent when cpus failed to come on-line. */
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extern int __cpu_number_map[NR_CPUS];
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#define cpu_number_map(cpu) __cpu_number_map[cpu]
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/* The reverse map from sequential logical cpu number to cpu id. */
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extern int __cpu_logical_map[NR_CPUS];
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#define cpu_logical_map(cpu) __cpu_logical_map[cpu]
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#define cpu_physical_id(cpu) cpu_logical_map(cpu)
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#define SMP_BOOT_CPU 0x1
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#define SMP_RESCHEDULE 0x2
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#define SMP_CALL_FUNCTION 0x4
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struct secondary_data {
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unsigned long stack;
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unsigned long thread_info;
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};
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extern struct secondary_data cpuboot_data;
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#ifdef CONFIG_SMP
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extern asmlinkage void smpboot_entry(void);
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extern void calculate_cpu_foreign_map(void);
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/*
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* Generate IPI list text
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*/
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extern void show_ipi_list(struct seq_file *p, int prec);
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/*
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* this function sends a 'reschedule' IPI to another CPU.
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* it goes straight through and wastes no time serializing
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* anything. Worst case is that we lose a reschedule ...
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*/
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static inline void smp_send_reschedule(int cpu)
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{
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mp_ops->send_ipi_single(cpu, SMP_RESCHEDULE);
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}
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#ifdef CONFIG_HOTPLUG_CPU
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static inline int __cpu_disable(void)
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{
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return mp_ops->cpu_disable();
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}
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static inline void __cpu_die(unsigned int cpu)
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{
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mp_ops->cpu_die(cpu);
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}
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extern void play_dead(void);
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#endif
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static inline void arch_send_call_function_single_ipi(int cpu)
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{
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mp_ops->send_ipi_single(cpu, SMP_CALL_FUNCTION);
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}
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static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
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{
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mp_ops->send_ipi_mask(mask, SMP_CALL_FUNCTION);
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}
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#endif
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#endif /* __ASM_SMP_H */
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