LXR linux/arch/riscv/include/asm/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 * Mapping between linux logical cpu index and hartid.
  21 */
  22extern 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 */
  26void show_ipi_stats(struct seq_file *p, int prec);
  27
  28/* SMP initialization hook for setup_arch */
  29void __init setup_smp(void);
  30
  31/* Called from C code, this handles an IPI. */
  32void handle_IPI(struct pt_regs *regs);
  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(int hartid);
  41void 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
  50int __cpu_disable(void);
  51void __cpu_die(unsigned int cpu);
  52void cpu_stop(void);
  53#else
  54#endif /* CONFIG_HOTPLUG_CPU */
  55
  56#else
  57
  58static inline void show_ipi_stats(struct seq_file *p, int prec)
  59{
  60}
  61
  62static inline int riscv_hartid_to_cpuid(int hartid)
  63{
  64        if (hartid == boot_cpu_hartid)
  65                return 0;
  66
  67        return -1;
  68}
  69static inline unsigned long cpuid_to_hartid_map(int cpu)
  70{
  71        return boot_cpu_hartid;
  72}
  73
  74static 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)
  84bool cpu_has_hotplug(unsigned int cpu);
  85#else
  86static inline bool cpu_has_hotplug(unsigned int cpu)
  87{
  88        return false;
  89}
  90#endif
  91
  92#endif /* _ASM_RISCV_SMP_H */
  93