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
15 struct seq_file;
16 extern 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 */
25 extern 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 */
29 void show_ipi_stats(struct seq_file *p, int prec);
30
31 /* SMP initialization hook for setup_arch */
32 void __init setup_smp(void);
33
34 /* Hook for the generic smp_call_function_many() routine. */
35 void arch_send_call_function_ipi_mask(struct cpumask *mask);
36
37 /* Hook for the generic smp_call_function_single() routine. */
38 void arch_send_call_function_single_ipi(int cpu);
39
40 int riscv_hartid_to_cpuid(unsigned long hartid);
41
42 /* Enable IPI for CPU hotplug */
43 void riscv_ipi_enable(void);
44
45 /* Disable IPI for CPU hotplug */
46 void riscv_ipi_disable(void);
47
48 /* Check if IPI interrupt numbers are available */
49 bool riscv_ipi_have_virq_range(void);
50
51 /* Set the IPI interrupt numbers for arch (called by irqchip drivers) */
52 void riscv_ipi_set_virq_range(int virq, int nr, bool use_for_rfence);
53
54 /* Check if we can use IPIs for remote FENCEs */
55 DECLARE_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 */
60 bool smp_crash_stop_failed(void);
61
62 /* Secondary hart entry */
63 asmlinkage 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
72 int __cpu_disable(void);
__cpu_die(unsigned int cpu)73 static inline void __cpu_die(unsigned int cpu) { }
74 #endif /* CONFIG_HOTPLUG_CPU */
75
76 #else
77
show_ipi_stats(struct seq_file * p,int prec)78 static inline void show_ipi_stats(struct seq_file *p, int prec)
79 {
80 }
81
riscv_hartid_to_cpuid(unsigned long hartid)82 static inline int riscv_hartid_to_cpuid(unsigned long hartid)
83 {
84 if (hartid == boot_cpu_hartid)
85 return 0;
86
87 return -1;
88 }
cpuid_to_hartid_map(int cpu)89 static inline unsigned long cpuid_to_hartid_map(int cpu)
90 {
91 return boot_cpu_hartid;
92 }
93
riscv_ipi_enable(void)94 static inline void riscv_ipi_enable(void)
95 {
96 }
97
riscv_ipi_disable(void)98 static inline void riscv_ipi_disable(void)
99 {
100 }
101
riscv_ipi_have_virq_range(void)102 static inline bool riscv_ipi_have_virq_range(void)
103 {
104 return false;
105 }
106
riscv_ipi_set_virq_range(int virq,int nr,bool use_for_rfence)107 static inline void riscv_ipi_set_virq_range(int virq, int nr,
108 bool use_for_rfence)
109 {
110 }
111
riscv_use_ipi_for_rfence(void)112 static 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)
120 bool cpu_has_hotplug(unsigned int cpu);
121 #else
cpu_has_hotplug(unsigned int cpu)122 static inline bool cpu_has_hotplug(unsigned int cpu)
123 {
124 return false;
125 }
126 #endif
127
128 #endif /* _ASM_RISCV_SMP_H */
129