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 void riscv_cpuid_to_hartid_mask(const struct cpumask *in, struct cpumask *out); 47 48 /* Set custom IPI operations */ 49 void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops); 50 51 /* Clear IPI for current CPU */ 52 void riscv_clear_ipi(void); 53 54 /* Secondary hart entry */ 55 asmlinkage void smp_callin(void); 56 57 /* 58 * Obtains the hart ID of the currently executing task. This relies on 59 * THREAD_INFO_IN_TASK, but we define that unconditionally. 60 */ 61 #define raw_smp_processor_id() (current_thread_info()->cpu) 62 63 #if defined CONFIG_HOTPLUG_CPU 64 int __cpu_disable(void); 65 void __cpu_die(unsigned int cpu); 66 void cpu_stop(void); 67 #else 68 #endif /* CONFIG_HOTPLUG_CPU */ 69 70 #else 71 72 static inline void show_ipi_stats(struct seq_file *p, int prec) 73 { 74 } 75 76 static inline int riscv_hartid_to_cpuid(int hartid) 77 { 78 if (hartid == boot_cpu_hartid) 79 return 0; 80 81 return -1; 82 } 83 static inline unsigned long cpuid_to_hartid_map(int cpu) 84 { 85 return boot_cpu_hartid; 86 } 87 88 static inline void riscv_cpuid_to_hartid_mask(const struct cpumask *in, 89 struct cpumask *out) 90 { 91 cpumask_clear(out); 92 cpumask_set_cpu(boot_cpu_hartid, out); 93 } 94 95 static inline void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops) 96 { 97 } 98 99 static inline void riscv_clear_ipi(void) 100 { 101 } 102 103 #endif /* CONFIG_SMP */ 104 105 #if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP) 106 bool cpu_has_hotplug(unsigned int cpu); 107 #else 108 static inline bool cpu_has_hotplug(unsigned int cpu) 109 { 110 return false; 111 } 112 #endif 113 114 #endif /* _ASM_RISCV_SMP_H */ 115