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 struct riscv_ipi_ops { 19 void (*ipi_inject)(const struct cpumask *target); 20 void (*ipi_clear)(void); 21 }; 22 23 #ifdef CONFIG_SMP 24 /* 25 * Mapping between linux logical cpu index and hartid. 26 */ 27 extern unsigned long __cpuid_to_hartid_map[NR_CPUS]; 28 #define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu] 29 30 /* print IPI stats */ 31 void show_ipi_stats(struct seq_file *p, int prec); 32 33 /* SMP initialization hook for setup_arch */ 34 void __init setup_smp(void); 35 36 /* Called from C code, this handles an IPI. */ 37 void handle_IPI(struct pt_regs *regs); 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 47 /* Set custom IPI operations */ 48 void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops); 49 50 /* Clear IPI for current CPU */ 51 void riscv_clear_ipi(void); 52 53 /* Secondary hart entry */ 54 asmlinkage void smp_callin(void); 55 56 /* 57 * Obtains the hart ID of the currently executing task. This relies on 58 * THREAD_INFO_IN_TASK, but we define that unconditionally. 59 */ 60 #define raw_smp_processor_id() (current_thread_info()->cpu) 61 62 #if defined CONFIG_HOTPLUG_CPU 63 int __cpu_disable(void); 64 void __cpu_die(unsigned int cpu); 65 void cpu_stop(void); 66 #else 67 #endif /* CONFIG_HOTPLUG_CPU */ 68 69 #else 70 show_ipi_stats(struct seq_file * p,int prec)71static inline void show_ipi_stats(struct seq_file *p, int prec) 72 { 73 } 74 riscv_hartid_to_cpuid(int hartid)75static inline int riscv_hartid_to_cpuid(int hartid) 76 { 77 if (hartid == boot_cpu_hartid) 78 return 0; 79 80 return -1; 81 } cpuid_to_hartid_map(int cpu)82static inline unsigned long cpuid_to_hartid_map(int cpu) 83 { 84 return boot_cpu_hartid; 85 } 86 riscv_set_ipi_ops(const struct riscv_ipi_ops * ops)87static inline void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops) 88 { 89 } 90 riscv_clear_ipi(void)91static inline void riscv_clear_ipi(void) 92 { 93 } 94 95 #endif /* CONFIG_SMP */ 96 97 void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out); 98 99 #if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP) 100 bool cpu_has_hotplug(unsigned int cpu); 101 #else cpu_has_hotplug(unsigned int cpu)102static inline bool cpu_has_hotplug(unsigned int cpu) 103 { 104 return false; 105 } 106 #endif 107 108 #endif /* _ASM_RISCV_SMP_H */ 109