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