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 15 struct seq_file; 16 extern 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 */ 25 extern 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 */ 29 void show_ipi_stats(struct seq_file *p, int prec); 30 31 /* SMP initialization hook for setup_arch */ 32 void __init setup_smp(void); 33 34 /* Hook for the generic smp_call_function_many() routine. */ 35 void arch_send_call_function_ipi_mask(struct cpumask *mask); 36 37 /* Hook for the generic smp_call_function_single() routine. */ 38 void arch_send_call_function_single_ipi(int cpu); 39 40 int riscv_hartid_to_cpuid(unsigned long hartid); 41 42 /* Enable IPI for CPU hotplug */ 43 void riscv_ipi_enable(void); 44 45 /* Disable IPI for CPU hotplug */ 46 void riscv_ipi_disable(void); 47 48 /* Check if IPI interrupt numbers are available */ 49 bool riscv_ipi_have_virq_range(void); 50 51 /* Set the IPI interrupt numbers for arch (called by irqchip drivers) */ 52 void riscv_ipi_set_virq_range(int virq, int nr, bool use_for_rfence); 53 54 /* Check if we can use IPIs for remote FENCEs */ 55 DECLARE_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 */ 60 bool smp_crash_stop_failed(void); 61 62 /* Secondary hart entry */ 63 asmlinkage 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 72 int __cpu_disable(void); 73 static inline void __cpu_die(unsigned int cpu) { } 74 #endif /* CONFIG_HOTPLUG_CPU */ 75 76 #else 77 78 static inline void show_ipi_stats(struct seq_file *p, int prec) 79 { 80 } 81 82 static inline int riscv_hartid_to_cpuid(unsigned long hartid) 83 { 84 if (hartid == boot_cpu_hartid) 85 return 0; 86 87 return -1; 88 } 89 static inline unsigned long cpuid_to_hartid_map(int cpu) 90 { 91 return boot_cpu_hartid; 92 } 93 94 static inline void riscv_ipi_enable(void) 95 { 96 } 97 98 static inline void riscv_ipi_disable(void) 99 { 100 } 101 102 static inline bool riscv_ipi_have_virq_range(void) 103 { 104 return false; 105 } 106 107 static inline void riscv_ipi_set_virq_range(int virq, int nr, 108 bool use_for_rfence) 109 { 110 } 111 112 static 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) 120 bool cpu_has_hotplug(unsigned int cpu); 121 #else 122 static inline bool cpu_has_hotplug(unsigned int cpu) 123 { 124 return false; 125 } 126 #endif 127 128 #endif /* _ASM_RISCV_SMP_H */ 129