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