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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Copyright (C) 2012 Regents of the University of California
*/
#ifndef _ASM_RISCV_SMP_H
#define _ASM_RISCV_SMP_H
#include <linux/cpumask.h>
#include <linux/irqreturn.h>
#include <linux/thread_info.h>
#define INVALID_HARTID ULONG_MAX
struct seq_file;
extern unsigned long boot_cpu_hartid;
struct riscv_ipi_ops {
void (*ipi_inject)(const struct cpumask *target);
void (*ipi_clear)(void);
};
#ifdef CONFIG_SMP
/*
* Mapping between linux logical cpu index and hartid.
*/
extern unsigned long __cpuid_to_hartid_map[NR_CPUS];
#define cpuid_to_hartid_map(cpu) __cpuid_to_hartid_map[cpu]
/* print IPI stats */
void show_ipi_stats(struct seq_file *p, int prec);
/* SMP initialization hook for setup_arch */
void __init setup_smp(void);
/* Called from C code, this handles an IPI. */
void handle_IPI(struct pt_regs *regs);
/* Hook for the generic smp_call_function_many() routine. */
void arch_send_call_function_ipi_mask(struct cpumask *mask);
/* Hook for the generic smp_call_function_single() routine. */
void arch_send_call_function_single_ipi(int cpu);
int riscv_hartid_to_cpuid(int hartid);
/* Set custom IPI operations */
void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops);
/* Clear IPI for current CPU */
void riscv_clear_ipi(void);
/* Secondary hart entry */
asmlinkage void smp_callin(void);
/*
* Obtains the hart ID of the currently executing task. This relies on
* THREAD_INFO_IN_TASK, but we define that unconditionally.
*/
#define raw_smp_processor_id() (current_thread_info()->cpu)
#if defined CONFIG_HOTPLUG_CPU
int __cpu_disable(void);
void __cpu_die(unsigned int cpu);
#endif /* CONFIG_HOTPLUG_CPU */
#else
static inline void show_ipi_stats(struct seq_file *p, int prec)
{
}
static inline int riscv_hartid_to_cpuid(int hartid)
{
if (hartid == boot_cpu_hartid)
return 0;
return -1;
}
static inline unsigned long cpuid_to_hartid_map(int cpu)
{
return boot_cpu_hartid;
}
static inline void riscv_set_ipi_ops(const struct riscv_ipi_ops *ops)
{
}
static inline void riscv_clear_ipi(void)
{
}
#endif /* CONFIG_SMP */
#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
bool cpu_has_hotplug(unsigned int cpu);
#else
static inline bool cpu_has_hotplug(unsigned int cpu)
{
return false;
}
#endif
#endif /* _ASM_RISCV_SMP_H */
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