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 * Mapping between linux logical cpu index and hartid. 21 */ 22 extern unsigned long __cpuid_to_hartid_map[NR_CPUS]; 23 #define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu] 24 25 /* print IPI stats */ 26 void show_ipi_stats(struct seq_file *p, int prec); 27 28 /* SMP initialization hook for setup_arch */ 29 void __init setup_smp(void); 30 31 /* Hook for the generic smp_call_function_many() routine. */ 32 void arch_send_call_function_ipi_mask(struct cpumask *mask); 33 34 /* Hook for the generic smp_call_function_single() routine. */ 35 void arch_send_call_function_single_ipi(int cpu); 36 37 int riscv_hartid_to_cpuid(int hartid); 38 void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out); 39 40 /* 41 * Obtains the hart ID of the currently executing task. This relies on 42 * THREAD_INFO_IN_TASK, but we define that unconditionally. 43 */ 44 #define raw_smp_processor_id() (current_thread_info()->cpu) 45 46 #if defined CONFIG_HOTPLUG_CPU 47 int __cpu_disable(void); 48 void __cpu_die(unsigned int cpu); 49 void cpu_stop(void); 50 #else 51 #endif /* CONFIG_HOTPLUG_CPU */ 52 53 #else 54 55 static inline void show_ipi_stats(struct seq_file *p, int prec) 56 { 57 } 58 59 static inline int riscv_hartid_to_cpuid(int hartid) 60 { 61 if (hartid == boot_cpu_hartid) 62 return 0; 63 64 return -1; 65 } 66 static inline unsigned long cpuid_to_hartid_map(int cpu) 67 { 68 return boot_cpu_hartid; 69 } 70 71 static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in, 72 struct cpumask *out) 73 { 74 cpumask_clear(out); 75 cpumask_set_cpu(boot_cpu_hartid, out); 76 } 77 78 #endif /* CONFIG_SMP */ 79 80 #if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP) 81 bool cpu_has_hotplug(unsigned int cpu); 82 #else 83 static inline bool cpu_has_hotplug(unsigned int cpu) 84 { 85 return false; 86 } 87 #endif 88 89 #endif /* _ASM_RISCV_SMP_H */ 90