1 /* 2 * Copyright (C) 2012 Regents of the University of California 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation, version 2. 7 * 8 * This program is distributed in the hope that it will be useful, 9 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * GNU General Public License for more details. 12 */ 13 14 #ifndef _ASM_RISCV_SMP_H 15 #define _ASM_RISCV_SMP_H 16 17 #include <linux/cpumask.h> 18 #include <linux/irqreturn.h> 19 #include <linux/thread_info.h> 20 21 #define INVALID_HARTID ULONG_MAX 22 23 struct seq_file; 24 extern unsigned long boot_cpu_hartid; 25 26 #ifdef CONFIG_SMP 27 /* 28 * Mapping between linux logical cpu index and hartid. 29 */ 30 extern unsigned long __cpuid_to_hartid_map[NR_CPUS]; 31 #define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu] 32 33 /* print IPI stats */ 34 void show_ipi_stats(struct seq_file *p, int prec); 35 36 /* SMP initialization hook for setup_arch */ 37 void __init setup_smp(void); 38 39 /* Hook for the generic smp_call_function_many() routine. */ 40 void arch_send_call_function_ipi_mask(struct cpumask *mask); 41 42 /* Hook for the generic smp_call_function_single() routine. */ 43 void arch_send_call_function_single_ipi(int cpu); 44 45 int riscv_hartid_to_cpuid(int hartid); 46 void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out); 47 48 /* 49 * Obtains the hart ID of the currently executing task. This relies on 50 * THREAD_INFO_IN_TASK, but we define that unconditionally. 51 */ 52 #define raw_smp_processor_id() (current_thread_info()->cpu) 53 54 #else 55 56 static inline void show_ipi_stats(struct seq_file *p, int prec) 57 { 58 } 59 60 static inline int riscv_hartid_to_cpuid(int hartid) 61 { 62 if (hartid == boot_cpu_hartid) 63 return 0; 64 65 return -1; 66 } 67 static inline unsigned long cpuid_to_hartid_map(int cpu) 68 { 69 return boot_cpu_hartid; 70 } 71 72 static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in, 73 struct cpumask *out) 74 { 75 cpumask_set_cpu(cpuid_to_hartid_map(0), out); 76 } 77 78 #endif /* CONFIG_SMP */ 79 #endif /* _ASM_RISCV_SMP_H */ 80