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); 53 54 /* Check other CPUs stop or not */ 55 bool smp_crash_stop_failed(void); 56 57 /* Secondary hart entry */ 58 asmlinkage void smp_callin(void); 59 60 /* 61 * Obtains the hart ID of the currently executing task. This relies on 62 * THREAD_INFO_IN_TASK, but we define that unconditionally. 63 */ 64 #define raw_smp_processor_id() (current_thread_info()->cpu) 65 66 #if defined CONFIG_HOTPLUG_CPU 67 int __cpu_disable(void); 68 static inline void __cpu_die(unsigned int cpu) { } 69 #endif /* CONFIG_HOTPLUG_CPU */ 70 71 #else 72 73 static inline void show_ipi_stats(struct seq_file *p, int prec) 74 { 75 } 76 77 static inline int riscv_hartid_to_cpuid(unsigned long hartid) 78 { 79 if (hartid == boot_cpu_hartid) 80 return 0; 81 82 return -1; 83 } 84 static inline unsigned long cpuid_to_hartid_map(int cpu) 85 { 86 return boot_cpu_hartid; 87 } 88 89 static inline void riscv_ipi_enable(void) 90 { 91 } 92 93 static inline void riscv_ipi_disable(void) 94 { 95 } 96 97 static inline bool riscv_ipi_have_virq_range(void) 98 { 99 return false; 100 } 101 102 static inline void riscv_ipi_set_virq_range(int virq, int nr) 103 { 104 } 105 106 #endif /* CONFIG_SMP */ 107 108 #if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP) 109 bool cpu_has_hotplug(unsigned int cpu); 110 #else 111 static inline bool cpu_has_hotplug(unsigned int cpu) 112 { 113 return false; 114 } 115 #endif 116 117 #endif /* _ASM_RISCV_SMP_H */ 118