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
  21 extern int smp_num_siblings;
  22 extern unsigned int num_processors;
  23
  24 DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map);
  25 DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
  26 DECLARE_PER_CPU(u16, cpu_llc_id);
  27 DECLARE_PER_CPU(int, cpu_number);
  28
  29 static inline struct cpumask *cpu_sibling_mask(int cpu)
  30 {
  31         return per_cpu(cpu_sibling_map, cpu);
  32 }
  33
  34 static inline struct cpumask *cpu_core_mask(int cpu)
  35 {
  36         return per_cpu(cpu_core_map, cpu);
  37 }
  38
  39 DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
  40 DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
  41
  42 /* Static state in head.S used to set up a CPU */
  43 extern struct {
  44         void *sp;
  45         unsigned short ss;
  46 } stack_start;
  47
  48 struct 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 */
  66 extern 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
  72 extern struct smp_ops smp_ops;
  73
  74 static inline void smp_send_stop(void)
  75 {
  76         smp_ops.smp_send_stop();
  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)
  95 {
  96         return smp_ops.cpu_up(cpu);
  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 native_smp_cpus_done(unsigned int max_cpus);
 133 int native_cpu_up(unsigned int cpunum);
 134 int native_cpu_disable(void);
 135 void native_cpu_die(unsigned int cpu);
 136 void native_play_dead(void);
 137 void play_dead_common(void);
 138
 139 void native_send_call_func_ipi(const struct cpumask *mask);
 140 void native_send_call_func_single_ipi(int cpu);
 141
 142 void 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 */
 146 static inline int num_booting_cpus(void)
 147 {
 148         return cpumask_weight(cpu_callout_mask);
 149 }
 150 #endif /* CONFIG_SMP */
 151
 152 extern 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))
 161 extern 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
 179 static 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
 187 extern 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 */