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 enum ipi_message_type { 19 IPI_RESCHEDULE, 20 IPI_CALL_FUNC, 21 IPI_CPU_STOP, 22 IPI_CPU_CRASH_STOP, 23 IPI_IRQ_WORK, 24 IPI_TIMER, 25 IPI_CPU_BACKTRACE, 26 IPI_KGDB_ROUNDUP, 27 IPI_MAX 28 }; 29 30 #ifdef CONFIG_SMP 31 32 #include <linux/jump_label.h> 33 34 /* 35 * Mapping between linux logical cpu index and hartid. 36 */ 37 extern unsigned long __cpuid_to_hartid_map[NR_CPUS]; 38 #define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu] 39 40 /* print IPI stats */ 41 void show_ipi_stats(struct seq_file *p, int prec); 42 43 /* SMP initialization hook for setup_arch */ 44 void __init setup_smp(void); 45 46 /* Hook for the generic smp_call_function_many() routine. */ 47 void arch_send_call_function_ipi_mask(struct cpumask *mask); 48 49 /* Hook for the generic smp_call_function_single() routine. */ 50 void arch_send_call_function_single_ipi(int cpu); 51 52 int riscv_hartid_to_cpuid(unsigned long hartid); 53 54 /* Enable IPI for CPU hotplug */ 55 void riscv_ipi_enable(void); 56 57 /* Disable IPI for CPU hotplug */ 58 void riscv_ipi_disable(void); 59 60 /* Check if IPI interrupt numbers are available */ 61 bool riscv_ipi_have_virq_range(void); 62 63 /* Set the IPI interrupt numbers for arch (called by irqchip drivers) */ 64 void riscv_ipi_set_virq_range(int virq, int nr); 65 66 /* Check other CPUs stop or not */ 67 bool smp_crash_stop_failed(void); 68 69 /* Secondary hart entry */ 70 asmlinkage void smp_callin(void); 71 72 /* 73 * Obtains the hart ID of the currently executing task. This relies on 74 * THREAD_INFO_IN_TASK, but we define that unconditionally. 75 */ 76 #define raw_smp_processor_id() (current_thread_info()->cpu) 77 78 #if defined CONFIG_HOTPLUG_CPU 79 int __cpu_disable(void); 80 static inline void __cpu_die(unsigned int cpu) { } 81 #endif /* CONFIG_HOTPLUG_CPU */ 82 83 #else 84 85 static inline void show_ipi_stats(struct seq_file *p, int prec) 86 { 87 } 88 89 static inline int riscv_hartid_to_cpuid(unsigned long hartid) 90 { 91 if (hartid == boot_cpu_hartid) 92 return 0; 93 94 return -1; 95 } 96 static inline unsigned long cpuid_to_hartid_map(int cpu) 97 { 98 return boot_cpu_hartid; 99 } 100 101 static inline void riscv_ipi_enable(void) 102 { 103 } 104 105 static inline void riscv_ipi_disable(void) 106 { 107 } 108 109 static inline bool riscv_ipi_have_virq_range(void) 110 { 111 return false; 112 } 113 114 static inline void riscv_ipi_set_virq_range(int virq, int nr) 115 { 116 } 117 118 #endif /* CONFIG_SMP */ 119 120 #if defined(CONFIG_HOTPLUG_CPU) 121 bool cpu_has_hotplug(unsigned int cpu); 122 #else 123 static inline bool cpu_has_hotplug(unsigned int cpu) 124 { 125 return false; 126 } 127 #endif 128 129 #endif /* _ASM_RISCV_SMP_H */ 130