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, bool use_for_rfence);
53
54/* Check if we can use IPIs for remote FENCEs */
55DECLARE_STATIC_KEY_FALSE(riscv_ipi_for_rfence);
56#define riscv_use_ipi_for_rfence() \
57	static_branch_unlikely(&riscv_ipi_for_rfence)
58
59/* Check other CPUs stop or not */
60bool smp_crash_stop_failed(void);
61
62/* Secondary hart entry */
63asmlinkage void smp_callin(void);
64
65/*
66 * Obtains the hart ID of the currently executing task.  This relies on
67 * THREAD_INFO_IN_TASK, but we define that unconditionally.
68 */
69#define raw_smp_processor_id() (current_thread_info()->cpu)
70
71#if defined CONFIG_HOTPLUG_CPU
72int __cpu_disable(void);
73static inline void __cpu_die(unsigned int cpu) { }
74#endif /* CONFIG_HOTPLUG_CPU */
75
76#else
77
78static inline void show_ipi_stats(struct seq_file *p, int prec)
79{
80}
81
82static inline int riscv_hartid_to_cpuid(unsigned long hartid)
83{
84	if (hartid == boot_cpu_hartid)
85		return 0;
86
87	return -1;
88}
89static inline unsigned long cpuid_to_hartid_map(int cpu)
90{
91	return boot_cpu_hartid;
92}
93
94static inline void riscv_ipi_enable(void)
95{
96}
97
98static inline void riscv_ipi_disable(void)
99{
100}
101
102static inline bool riscv_ipi_have_virq_range(void)
103{
104	return false;
105}
106
107static inline void riscv_ipi_set_virq_range(int virq, int nr,
108					    bool use_for_rfence)
109{
110}
111
112static inline bool riscv_use_ipi_for_rfence(void)
113{
114	return false;
115}
116
117#endif /* CONFIG_SMP */
118
119#if defined(CONFIG_HOTPLUG_CPU) && (CONFIG_SMP)
120bool cpu_has_hotplug(unsigned int cpu);
121#else
122static inline bool cpu_has_hotplug(unsigned int cpu)
123{
124	return false;
125}
126#endif
127
128#endif /* _ASM_RISCV_SMP_H */
129