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 <asm/percpu.h>
   6
   7 /*
   8  * We need the APIC definitions automatically as part of 'smp.h'
   9  */
  10 #ifdef CONFIG_X86_LOCAL_APIC
  11 # include <asm/mpspec.h>
  12 # include <asm/apic.h>
  13 # ifdef CONFIG_X86_IO_APIC
  14 #  include <asm/io_apic.h>
  15 # endif
  16 #endif
  17 #include <asm/thread_info.h>
  18 #include <asm/cpumask.h>
  19
  20 extern int smp_num_siblings;
  21 extern unsigned int num_processors;
  22
  23 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);
  24 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
  25 /* cpus sharing the last level cache: */
  26 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
  27 DECLARE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id);
  28 DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
  29
  30 static inline struct cpumask *cpu_llc_shared_mask(int cpu)
  31 {
  32         return per_cpu(cpu_llc_shared_map, cpu);
  33 }
  34
  35 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid);
  36 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
  37 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  38 DECLARE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid);
  39 #endif
  40
  41 /* Static state in head.S used to set up a CPU */
  42 extern unsigned long stack_start; /* Initial stack pointer address */
  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 (*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 native_smp_cpus_done(unsigned int max_cpus);
 133 void common_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 134 int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 135 int native_cpu_disable(void);
 136 int common_cpu_die(unsigned int cpu);
 137 void native_cpu_die(unsigned int cpu);
 138 void native_play_dead(void);
 139 void play_dead_common(void);
 140 void wbinvd_on_cpu(int cpu);
 141 int wbinvd_on_all_cpus(void);
 142
 143 void native_send_call_func_ipi(const struct cpumask *mask);
 144 void native_send_call_func_single_ipi(int cpu);
 145 void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
 146
 147 void smp_store_boot_cpu_info(void);
 148 void smp_store_cpu_info(int id);
 149 #define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 150
 151 #else /* !CONFIG_SMP */
 152 #define wbinvd_on_cpu(cpu)     wbinvd()
 153 static inline int wbinvd_on_all_cpus(void)
 154 {
 155         wbinvd();
 156         return 0;
 157 }
 158 #define smp_num_siblings        1
 159 #endif /* CONFIG_SMP */
 160
 161 extern unsigned disabled_cpus;
 162
 163 #ifdef CONFIG_X86_32_SMP
 164 /*
 165  * This function is needed by all SMP systems. It must _always_ be valid
 166  * from the initial startup. We map APIC_BASE very early in page_setup(),
 167  * so this is correct in the x86 case.
 168  */
 169 #define raw_smp_processor_id() (this_cpu_read(cpu_number))
 170 extern int safe_smp_processor_id(void);
 171
 172 #elif defined(CONFIG_X86_64_SMP)
 173 #define raw_smp_processor_id() (this_cpu_read(cpu_number))
 174
 175 #define stack_smp_processor_id()                                        \
 176 ({                                                              \
 177         struct thread_info *ti;                                         \
 178         __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));      \
 179         ti->cpu;                                                        \
 180 })
 181 #define safe_smp_processor_id()         smp_processor_id()
 182
 183 #endif
 184
 185 #ifdef CONFIG_X86_LOCAL_APIC
 186
 187 #ifndef CONFIG_X86_64
 188 static inline int logical_smp_processor_id(void)
 189 {
 190         /* we don't want to mark this access volatile - bad code generation */
 191         return GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
 192 }
 193
 194 #endif
 195
 196 extern int hard_smp_processor_id(void);
 197
 198 #else /* CONFIG_X86_LOCAL_APIC */
 199
 200 # ifndef CONFIG_SMP
 201 #  define hard_smp_processor_id()       0
 202 # endif
 203
 204 #endif /* CONFIG_X86_LOCAL_APIC */
 205
 206 #ifdef CONFIG_DEBUG_NMI_SELFTEST
 207 extern void nmi_selftest(void);
 208 #else
 209 #define nmi_selftest() do { } while (0)
 210 #endif
 211
 212 #endif /* __ASSEMBLY__ */
 213 #endif /* _ASM_X86_SMP_H */