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