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 /* Called from C code, this handles an IPI. */ 32 void handle_IPI(struct pt_regs *regs); 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(int hartid); 41 void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out); 42 43 /* Secondary hart entry */ 44 asmlinkage void smp_callin(void); 45 46 /* 47 * Obtains the hart ID of the currently executing task. This relies on 48 * THREAD_INFO_IN_TASK, but we define that unconditionally. 49 */ 50 #define raw_smp_processor_id() (current_thread_info()->cpu) 51 52 #if defined CONFIG_HOTPLUG_CPU 53 int __cpu_disable(void); 54 void __cpu_die(unsigned int cpu); 55 void cpu_stop(void); 56 #else 57 #endif /* CONFIG_HOTPLUG_CPU */ 58 59 #else 60 61 static inline void show_ipi_stats(struct seq_file *p, int prec) 62 { 63 } 64 65 static inline int riscv_hartid_to_cpuid(int hartid) 66 { 67 if (hartid == boot_cpu_hartid) 68 return 0; 69 70 return -1; 71 } 72 static inline unsigned long cpuid_to_hartid_map(int cpu) 73 { 74 return boot_cpu_hartid; 75 } 76 77 static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in, 78 struct cpumask *out) 79 { 80 cpumask_clear(out); 81 cpumask_set_cpu(boot_cpu_hartid, out); 82 } 83 84 #endif /* CONFIG_SMP */ 85 86 #if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP) 87 bool cpu_has_hotplug(unsigned int cpu); 88 #else 89 static inline bool cpu_has_hotplug(unsigned int cpu) 90 { 91 return false; 92 } 93 #endif 94 95 #endif /* _ASM_RISCV_SMP_H */ 96