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

   1#ifndef _ASM_X86_SMP_H
   2#define _ASM_X86_SMP_H
   3#ifndef __ASSEMBLY__
   4#include <linux/cpumask.h>
   5#include <linux/init.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(cpumask_var_t, cpu_sibling_map);
  25DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
  26DECLARE_PER_CPU(u16, cpu_llc_id);
  27DECLARE_PER_CPU(int, cpu_number);
  28
  29static inline struct cpumask *cpu_sibling_mask(int cpu)
  30{
  31        return per_cpu(cpu_sibling_map, cpu);
  32}
  33
  34static inline struct cpumask *cpu_core_mask(int cpu)
  35{
  36        return per_cpu(cpu_core_map, cpu);
  37}
  38
  39DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
  40DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
  41
  42/* Static state in head.S used to set up a CPU */
  43extern struct {
  44        void *sp;
  45        unsigned short ss;
  46} stack_start;
  47
  48struct smp_ops {
  49        void (*smp_prepare_boot_cpu)(void);
  50        void (*smp_prepare_cpus)(unsigned max_cpus);
  51        void (*smp_cpus_done)(unsigned max_cpus);
  52
  53        void (*smp_send_stop)(void);
  54        void (*smp_send_reschedule)(int cpu);
  55
  56        int (*cpu_up)(unsigned cpu);
  57        int (*cpu_disable)(void);
  58        void (*cpu_die)(unsigned int cpu);
  59        void (*play_dead)(void);
  60
  61        void (*send_call_func_ipi)(const struct cpumask *mask);
  62        void (*send_call_func_single_ipi)(int cpu);
  63};
  64
  65/* Globals due to paravirt */
  66extern void set_cpu_sibling_map(int cpu);
  67
  68#ifdef CONFIG_SMP
  69#ifndef CONFIG_PARAVIRT
  70#define startup_ipi_hook(phys_apicid, start_eip, start_esp) do { } while (0)
  71#endif
  72extern struct smp_ops smp_ops;
  73
  74static inline void smp_send_stop(void)
  75{
  76        smp_ops.smp_send_stop();
  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)
  95{
  96        return smp_ops.cpu_up(cpu);
  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);
 133int native_cpu_up(unsigned int cpunum);
 134int native_cpu_disable(void);
 135void native_cpu_die(unsigned int cpu);
 136void native_play_dead(void);
 137void play_dead_common(void);
 138
 139void native_send_call_func_ipi(const struct cpumask *mask);
 140void native_send_call_func_single_ipi(int cpu);
 141
 142void smp_store_cpu_info(int id);
 143#define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 144
 145/* We don't mark CPUs online until __cpu_up(), so we need another measure */
 146static inline int num_booting_cpus(void)
 147{
 148        return cpumask_weight(cpu_callout_mask);
 149}
 150#endif /* CONFIG_SMP */
 151
 152extern unsigned disabled_cpus __cpuinitdata;
 153
 154#ifdef CONFIG_X86_32_SMP
 155/*
 156 * This function is needed by all SMP systems. It must _always_ be valid
 157 * from the initial startup. We map APIC_BASE very early in page_setup(),
 158 * so this is correct in the x86 case.
 159 */
 160#define raw_smp_processor_id() (percpu_read(cpu_number))
 161extern int safe_smp_processor_id(void);
 162
 163#elif defined(CONFIG_X86_64_SMP)
 164#define raw_smp_processor_id() (percpu_read(cpu_number))
 165
 166#define stack_smp_processor_id()                                        \
 167({                                                              \
 168        struct thread_info *ti;                                         \
 169        __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));      \
 170        ti->cpu;                                                        \
 171})
 172#define safe_smp_processor_id()         smp_processor_id()
 173
 174#endif
 175
 176#ifdef CONFIG_X86_LOCAL_APIC
 177
 178#ifndef CONFIG_X86_64
 179static inline int logical_smp_processor_id(void)
 180{
 181        /* we don't want to mark this access volatile - bad code generation */
 182        return GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
 183}
 184
 185#endif
 186
 187extern int hard_smp_processor_id(void);
 188
 189#else /* CONFIG_X86_LOCAL_APIC */
 190
 191# ifndef CONFIG_SMP
 192#  define hard_smp_processor_id()       0
 193# endif
 194
 195#endif /* CONFIG_X86_LOCAL_APIC */
 196
 197#endif /* __ASSEMBLY__ */
 198#endif /* _ASM_X86_SMP_H */
 199