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
  21 extern int smp_num_siblings;
  22 extern unsigned int num_processors;
  23
  24 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);
  25 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
  26 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_die_map);
  27 /* cpus sharing the last level cache: */
  28 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
  29 DECLARE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id);
  30 DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
  31
  32 static inline struct cpumask *cpu_llc_shared_mask(int cpu)
  33 {
  34         return per_cpu(cpu_llc_shared_map, cpu);
  35 }
  36
  37 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid);
  38 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u32, x86_cpu_to_acpiid);
  39 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
  40 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  41 DECLARE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid);
  42 #endif
  43
  44 struct task_struct;
  45
  46 struct smp_ops {
  47         void (*smp_prepare_boot_cpu)(void);
  48         void (*smp_prepare_cpus)(unsigned max_cpus);
  49         void (*smp_cpus_done)(unsigned max_cpus);
  50
  51         void (*stop_other_cpus)(int wait);
  52         void (*crash_stop_other_cpus)(void);
  53         void (*smp_send_reschedule)(int cpu);
  54
  55         int (*cpu_up)(unsigned cpu, struct task_struct *tidle);
  56         int (*cpu_disable)(void);
  57         void (*cpu_die)(unsigned int cpu);
  58         void (*play_dead)(void);
  59
  60         void (*send_call_func_ipi)(const struct cpumask *mask);
  61         void (*send_call_func_single_ipi)(int cpu);
  62 };
  63
  64 /* Globals due to paravirt */
  65 extern void set_cpu_sibling_map(int cpu);
  66
  67 #ifdef CONFIG_SMP
  68 extern struct smp_ops smp_ops;
  69
  70 static inline void smp_send_stop(void)
  71 {
  72         smp_ops.stop_other_cpus(0);
  73 }
  74
  75 static inline void stop_other_cpus(void)
  76 {
  77         smp_ops.stop_other_cpus(1);
  78 }
  79
  80 static inline void smp_prepare_boot_cpu(void)
  81 {
  82         smp_ops.smp_prepare_boot_cpu();
  83 }
  84
  85 static inline void smp_prepare_cpus(unsigned int max_cpus)
  86 {
  87         smp_ops.smp_prepare_cpus(max_cpus);
  88 }
  89
  90 static inline void smp_cpus_done(unsigned int max_cpus)
  91 {
  92         smp_ops.smp_cpus_done(max_cpus);
  93 }
  94
  95 static inline int __cpu_up(unsigned int cpu, struct task_struct *tidle)
  96 {
  97         return smp_ops.cpu_up(cpu, tidle);
  98 }
  99
 100 static inline int __cpu_disable(void)
 101 {
 102         return smp_ops.cpu_disable();
 103 }
 104
 105 static inline void __cpu_die(unsigned int cpu)
 106 {
 107         smp_ops.cpu_die(cpu);
 108 }
 109
 110 static inline void play_dead(void)
 111 {
 112         smp_ops.play_dead();
 113 }
 114
 115 static inline void smp_send_reschedule(int cpu)
 116 {
 117         smp_ops.smp_send_reschedule(cpu);
 118 }
 119
 120 static inline void arch_send_call_function_single_ipi(int cpu)
 121 {
 122         smp_ops.send_call_func_single_ipi(cpu);
 123 }
 124
 125 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 126 {
 127         smp_ops.send_call_func_ipi(mask);
 128 }
 129
 130 void cpu_disable_common(void);
 131 void native_smp_prepare_boot_cpu(void);
 132 void native_smp_prepare_cpus(unsigned int max_cpus);
 133 void calculate_max_logical_packages(void);
 134 void native_smp_cpus_done(unsigned int max_cpus);
 135 int common_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 136 int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 137 int native_cpu_disable(void);
 138 int common_cpu_die(unsigned int cpu);
 139 void native_cpu_die(unsigned int cpu);
 140 void hlt_play_dead(void);
 141 void native_play_dead(void);
 142 void play_dead_common(void);
 143 void wbinvd_on_cpu(int cpu);
 144 int wbinvd_on_all_cpus(void);
 145
 146 void native_smp_send_reschedule(int cpu);
 147 void native_send_call_func_ipi(const struct cpumask *mask);
 148 void native_send_call_func_single_ipi(int cpu);
 149 void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
 150
 151 void smp_store_boot_cpu_info(void);
 152 void smp_store_cpu_info(int id);
 153
 154 asmlinkage __visible void smp_reboot_interrupt(void);
 155 __visible void smp_reschedule_interrupt(struct pt_regs *regs);
 156 __visible void smp_call_function_interrupt(struct pt_regs *regs);
 157 __visible void smp_call_function_single_interrupt(struct pt_regs *r);
 158
 159 #define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 160 #define cpu_acpi_id(cpu)        per_cpu(x86_cpu_to_acpiid, cpu)
 161
 162 /*
 163  * This function is needed by all SMP systems. It must _always_ be valid
 164  * from the initial startup. We map APIC_BASE very early in page_setup(),
 165  * so this is correct in the x86 case.
 166  */
 167 #define raw_smp_processor_id()  this_cpu_read(cpu_number)
 168 #define __smp_processor_id() __this_cpu_read(cpu_number)
 169
 170 #ifdef CONFIG_X86_32
 171 extern int safe_smp_processor_id(void);
 172 #else
 173 # define safe_smp_processor_id()        smp_processor_id()
 174 #endif
 175
 176 #else /* !CONFIG_SMP */
 177 #define wbinvd_on_cpu(cpu)     wbinvd()
 178 static inline int wbinvd_on_all_cpus(void)
 179 {
 180         wbinvd();
 181         return 0;
 182 }
 183 #endif /* CONFIG_SMP */
 184
 185 extern unsigned disabled_cpus;
 186
 187 #ifdef CONFIG_X86_LOCAL_APIC
 188 extern int hard_smp_processor_id(void);
 189
 190 #else /* CONFIG_X86_LOCAL_APIC */
 191 #define hard_smp_processor_id() 0
 192 #endif /* CONFIG_X86_LOCAL_APIC */
 193
 194 #ifdef CONFIG_DEBUG_NMI_SELFTEST
 195 extern void nmi_selftest(void);
 196 #else
 197 #define nmi_selftest() do { } while (0)
 198 #endif
 199
 200 #endif /* __ASSEMBLY__ */
 201 #endif /* _ASM_X86_SMP_H */