LXR linux/arch/x86/include/asm/smp.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_SMP_H
   3#define _ASM_X86_SMP_H
   4#ifndef __ASSEMBLY__
   5#include <linux/cpumask.h>
   6#include <asm/percpu.h>
   7
   8/*
   9 * We need the APIC definitions automatically as part of 'smp.h'
  10 */
  11#ifdef CONFIG_X86_LOCAL_APIC
  12# include <asm/mpspec.h>
  13# include <asm/apic.h>
  14# ifdef CONFIG_X86_IO_APIC
  15#  include <asm/io_apic.h>
  16# endif
  17#endif
  18#include <asm/thread_info.h>
  19#include <asm/cpumask.h>
  20
  21extern int smp_num_siblings;
  22extern unsigned int num_processors;
  23
  24DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);
  25DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
  26/* cpus sharing the last level cache: */
  27DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
  28DECLARE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id);
  29DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
  30
  31static inline struct cpumask *cpu_llc_shared_mask(int cpu)
  32{
  33        return per_cpu(cpu_llc_shared_map, cpu);
  34}
  35
  36DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid);
  37DECLARE_EARLY_PER_CPU_READ_MOSTLY(u32, x86_cpu_to_acpiid);
  38DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
  39#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  40DECLARE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid);
  41#endif
  42
  43struct task_struct;
  44
  45struct smp_ops {
  46        void (*smp_prepare_boot_cpu)(void);
  47        void (*smp_prepare_cpus)(unsigned max_cpus);
  48        void (*smp_cpus_done)(unsigned max_cpus);
  49
  50        void (*stop_other_cpus)(int wait);
  51        void (*crash_stop_other_cpus)(void);
  52        void (*smp_send_reschedule)(int cpu);
  53
  54        int (*cpu_up)(unsigned cpu, struct task_struct *tidle);
  55        int (*cpu_disable)(void);
  56        void (*cpu_die)(unsigned int cpu);
  57        void (*play_dead)(void);
  58
  59        void (*send_call_func_ipi)(const struct cpumask *mask);
  60        void (*send_call_func_single_ipi)(int cpu);
  61};
  62
  63/* Globals due to paravirt */
  64extern void set_cpu_sibling_map(int cpu);
  65
  66#ifdef CONFIG_SMP
  67extern struct smp_ops smp_ops;
  68
  69static inline void smp_send_stop(void)
  70{
  71        smp_ops.stop_other_cpus(0);
  72}
  73
  74static inline void stop_other_cpus(void)
  75{
  76        smp_ops.stop_other_cpus(1);
  77}
  78
  79static inline void smp_prepare_boot_cpu(void)
  80{
  81        smp_ops.smp_prepare_boot_cpu();
  82}
  83
  84static inline void smp_prepare_cpus(unsigned int max_cpus)
  85{
  86        smp_ops.smp_prepare_cpus(max_cpus);
  87}
  88
  89static inline void smp_cpus_done(unsigned int max_cpus)
  90{
  91        smp_ops.smp_cpus_done(max_cpus);
  92}
  93
  94static inline int __cpu_up(unsigned int cpu, struct task_struct *tidle)
  95{
  96        return smp_ops.cpu_up(cpu, tidle);
  97}
  98
  99static inline int __cpu_disable(void)
 100{
 101        return smp_ops.cpu_disable();
 102}
 103
 104static inline void __cpu_die(unsigned int cpu)
 105{
 106        smp_ops.cpu_die(cpu);
 107}
 108
 109static inline void play_dead(void)
 110{
 111        smp_ops.play_dead();
 112}
 113
 114static inline void smp_send_reschedule(int cpu)
 115{
 116        smp_ops.smp_send_reschedule(cpu);
 117}
 118
 119static inline void arch_send_call_function_single_ipi(int cpu)
 120{
 121        smp_ops.send_call_func_single_ipi(cpu);
 122}
 123
 124static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 125{
 126        smp_ops.send_call_func_ipi(mask);
 127}
 128
 129void cpu_disable_common(void);
 130void native_smp_prepare_boot_cpu(void);
 131void native_smp_prepare_cpus(unsigned int max_cpus);
 132void native_smp_cpus_done(unsigned int max_cpus);
 133void common_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 134int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 135int native_cpu_disable(void);
 136int common_cpu_die(unsigned int cpu);
 137void native_cpu_die(unsigned int cpu);
 138void hlt_play_dead(void);
 139void native_play_dead(void);
 140void play_dead_common(void);
 141void wbinvd_on_cpu(int cpu);
 142int wbinvd_on_all_cpus(void);
 143
 144void native_send_call_func_ipi(const struct cpumask *mask);
 145void native_send_call_func_single_ipi(int cpu);
 146void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
 147
 148void smp_store_boot_cpu_info(void);
 149void smp_store_cpu_info(int id);
 150#define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 151#define cpu_acpi_id(cpu)        per_cpu(x86_cpu_to_acpiid, cpu)
 152
 153/*
 154 * This function is needed by all SMP systems. It must _always_ be valid
 155 * from the initial startup. We map APIC_BASE very early in page_setup(),
 156 * so this is correct in the x86 case.
 157 */
 158#define raw_smp_processor_id() (this_cpu_read(cpu_number))
 159
 160#ifdef CONFIG_X86_32
 161extern int safe_smp_processor_id(void);
 162#else
 163# define safe_smp_processor_id()        smp_processor_id()
 164#endif
 165
 166#else /* !CONFIG_SMP */
 167#define wbinvd_on_cpu(cpu)     wbinvd()
 168static inline int wbinvd_on_all_cpus(void)
 169{
 170        wbinvd();
 171        return 0;
 172}
 173#define smp_num_siblings        1
 174#endif /* CONFIG_SMP */
 175
 176extern unsigned disabled_cpus;
 177
 178#ifdef CONFIG_X86_LOCAL_APIC
 179
 180#ifndef CONFIG_X86_64
 181static inline int logical_smp_processor_id(void)
 182{
 183        /* we don't want to mark this access volatile - bad code generation */
 184        return GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
 185}
 186
 187#endif
 188
 189extern int hard_smp_processor_id(void);
 190
 191#else /* CONFIG_X86_LOCAL_APIC */
 192#define hard_smp_processor_id() 0
 193#endif /* CONFIG_X86_LOCAL_APIC */
 194
 195#ifdef CONFIG_DEBUG_NMI_SELFTEST
 196extern void nmi_selftest(void);
 197#else
 198#define nmi_selftest() do { } while (0)
 199#endif
 200
 201#endif /* __ASSEMBLY__ */
 202#endif /* _ASM_X86_SMP_H */
 203