1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Copyright (C) 2012 Regents of the University of California 4 */ 5 6#ifndef _ASM_RISCV_SMP_H 7#define _ASM_RISCV_SMP_H 8 9#include <linux/cpumask.h> 10#include <linux/irqreturn.h> 11#include <linux/thread_info.h> 12 13#define INVALID_HARTID ULONG_MAX 14 15struct seq_file; 16extern unsigned long boot_cpu_hartid; 17 18#ifdef CONFIG_SMP 19 20#include <linux/jump_label.h> 21 22/* 23 * Mapping between linux logical cpu index and hartid. 24 */ 25extern unsigned long __cpuid_to_hartid_map[NR_CPUS]; 26#define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu] 27 28/* print IPI stats */ 29void show_ipi_stats(struct seq_file *p, int prec); 30 31/* SMP initialization hook for setup_arch */ 32void __init setup_smp(void); 33 34/* Hook for the generic smp_call_function_many() routine. */ 35void arch_send_call_function_ipi_mask(struct cpumask *mask); 36 37/* Hook for the generic smp_call_function_single() routine. */ 38void arch_send_call_function_single_ipi(int cpu); 39 40int riscv_hartid_to_cpuid(unsigned long hartid); 41 42/* Enable IPI for CPU hotplug */ 43void riscv_ipi_enable(void); 44 45/* Disable IPI for CPU hotplug */ 46void riscv_ipi_disable(void); 47 48/* Check if IPI interrupt numbers are available */ 49bool riscv_ipi_have_virq_range(void); 50 51/* Set the IPI interrupt numbers for arch (called by irqchip drivers) */ 52void riscv_ipi_set_virq_range(int virq, int nr, bool use_for_rfence); 53 54/* Check if we can use IPIs for remote FENCEs */ 55DECLARE_STATIC_KEY_FALSE(riscv_ipi_for_rfence); 56#define riscv_use_ipi_for_rfence() \ 57 static_branch_unlikely(&riscv_ipi_for_rfence) 58 59/* Check other CPUs stop or not */ 60bool smp_crash_stop_failed(void); 61 62/* Secondary hart entry */ 63asmlinkage void smp_callin(void); 64 65/* 66 * Obtains the hart ID of the currently executing task. This relies on 67 * THREAD_INFO_IN_TASK, but we define that unconditionally. 68 */ 69#define raw_smp_processor_id() (current_thread_info()->cpu) 70 71#if defined CONFIG_HOTPLUG_CPU 72int __cpu_disable(void); 73static inline void __cpu_die(unsigned int cpu) { } 74#endif /* CONFIG_HOTPLUG_CPU */ 75 76#else 77 78static inline void show_ipi_stats(struct seq_file *p, int prec) 79{ 80} 81 82static inline int riscv_hartid_to_cpuid(unsigned long hartid) 83{ 84 if (hartid == boot_cpu_hartid) 85 return 0; 86 87 return -1; 88} 89static inline unsigned long cpuid_to_hartid_map(int cpu) 90{ 91 return boot_cpu_hartid; 92} 93 94static inline void riscv_ipi_enable(void) 95{ 96} 97 98static inline void riscv_ipi_disable(void) 99{ 100} 101 102static inline bool riscv_ipi_have_virq_range(void) 103{ 104 return false; 105} 106 107static inline void riscv_ipi_set_virq_range(int virq, int nr, 108 bool use_for_rfence) 109{ 110} 111 112static inline bool riscv_use_ipi_for_rfence(void) 113{ 114 return false; 115} 116 117#endif /* CONFIG_SMP */ 118 119#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP) 120bool cpu_has_hotplug(unsigned int cpu); 121#else 122static inline bool cpu_has_hotplug(unsigned int cpu) 123{ 124 return false; 125} 126#endif 127 128#endif /* _ASM_RISCV_SMP_H */ 129