smp.h

  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
 15struct seq_file;
 16extern unsigned long boot_cpu_hartid;
 17
 18#ifdef CONFIG_SMP
 19
 20#include <linux/jump_label.h>
 21
 22/*
 23 * Mapping between linux logical cpu index and hartid.
 24 */
 25extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
 26#define cpuid_to_hartid_map(cpu)    __cpuid_to_hartid_map[cpu]
 27
 28/* print IPI stats */
 29void show_ipi_stats(struct seq_file *p, int prec);
 30
 31/* SMP initialization hook for setup_arch */
 32void __init setup_smp(void);
 33
 34/* Hook for the generic smp_call_function_many() routine. */
 35void arch_send_call_function_ipi_mask(struct cpumask *mask);
 36
 37/* Hook for the generic smp_call_function_single() routine. */
 38void arch_send_call_function_single_ipi(int cpu);
 39
 40int riscv_hartid_to_cpuid(unsigned long hartid);
 41
 42/* Enable IPI for CPU hotplug */
 43void riscv_ipi_enable(void);
 44
 45/* Disable IPI for CPU hotplug */
 46void riscv_ipi_disable(void);
 47
 48/* Check if IPI interrupt numbers are available */
 49bool riscv_ipi_have_virq_range(void);
 50
 51/* Set the IPI interrupt numbers for arch (called by irqchip drivers) */
 52void riscv_ipi_set_virq_range(int virq, int nr);
 53
 54/* Check other CPUs stop or not */
 55bool smp_crash_stop_failed(void);
 56
 57/* Secondary hart entry */
 58asmlinkage void smp_callin(void);
 59
 60/*
 61 * Obtains the hart ID of the currently executing task.  This relies on
 62 * THREAD_INFO_IN_TASK, but we define that unconditionally.
 63 */
 64#define raw_smp_processor_id() (current_thread_info()->cpu)
 65
 66#if defined CONFIG_HOTPLUG_CPU
 67int __cpu_disable(void);
 68static inline void __cpu_die(unsigned int cpu) { }
 69#endif /* CONFIG_HOTPLUG_CPU */
 70
 71#else
 72
 73static inline void show_ipi_stats(struct seq_file *p, int prec)
 74{
 75}
 76
 77static inline int riscv_hartid_to_cpuid(unsigned long hartid)
 78{
 79	if (hartid == boot_cpu_hartid)
 80		return 0;
 81
 82	return -1;
 83}
 84static inline unsigned long cpuid_to_hartid_map(int cpu)
 85{
 86	return boot_cpu_hartid;
 87}
 88
 89static inline void riscv_ipi_enable(void)
 90{
 91}
 92
 93static inline void riscv_ipi_disable(void)
 94{
 95}
 96
 97static inline bool riscv_ipi_have_virq_range(void)
 98{
 99	return false;
100}
101
102static inline void riscv_ipi_set_virq_range(int virq, int nr)
103{
104}
105
106#endif /* CONFIG_SMP */
107
108#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
109bool cpu_has_hotplug(unsigned int cpu);
110#else
111static inline bool cpu_has_hotplug(unsigned int cpu)
112{
113	return false;
114}
115#endif
116
117#endif /* _ASM_RISCV_SMP_H */