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Linux kernel mirror (for testing)
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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 */