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 #include <asm/cpufeature.h>
  21
  22 extern int smp_num_siblings;
  23 extern unsigned int num_processors;
  24
  25 static inline bool cpu_has_ht_siblings(void)
  26 {
  27         bool has_siblings = false;
  28 #ifdef CONFIG_SMP
  29         has_siblings = cpu_has_ht && smp_num_siblings > 1;
  30 #endif
  31         return has_siblings;
  32 }
  33
  34 DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map);
  35 DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
  36 /* cpus sharing the last level cache: */
  37 DECLARE_PER_CPU(cpumask_var_t, cpu_llc_shared_map);
  38 DECLARE_PER_CPU(u16, cpu_llc_id);
  39 DECLARE_PER_CPU(int, cpu_number);
  40
  41 static inline struct cpumask *cpu_sibling_mask(int cpu)
  42 {
  43         return per_cpu(cpu_sibling_map, cpu);
  44 }
  45
  46 static inline struct cpumask *cpu_core_mask(int cpu)
  47 {
  48         return per_cpu(cpu_core_map, cpu);
  49 }
  50
  51 static inline struct cpumask *cpu_llc_shared_mask(int cpu)
  52 {
  53         return per_cpu(cpu_llc_shared_map, cpu);
  54 }
  55
  56 DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
  57 DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
  58 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  59 DECLARE_EARLY_PER_CPU(int, x86_cpu_to_logical_apicid);
  60 #endif
  61
  62 /* Static state in head.S used to set up a CPU */
  63 extern unsigned long stack_start; /* Initial stack pointer address */
  64
  65 struct smp_ops {
  66         void (*smp_prepare_boot_cpu)(void);
  67         void (*smp_prepare_cpus)(unsigned max_cpus);
  68         void (*smp_cpus_done)(unsigned max_cpus);
  69
  70         void (*stop_other_cpus)(int wait);
  71         void (*smp_send_reschedule)(int cpu);
  72
  73         int (*cpu_up)(unsigned cpu);
  74         int (*cpu_disable)(void);
  75         void (*cpu_die)(unsigned int cpu);
  76         void (*play_dead)(void);
  77
  78         void (*send_call_func_ipi)(const struct cpumask *mask);
  79         void (*send_call_func_single_ipi)(int cpu);
  80 };
  81
  82 /* Globals due to paravirt */
  83 extern void set_cpu_sibling_map(int cpu);
  84
  85 #ifdef CONFIG_SMP
  86 #ifndef CONFIG_PARAVIRT
  87 #define startup_ipi_hook(phys_apicid, start_eip, start_esp) do { } while (0)
  88 #endif
  89 extern struct smp_ops smp_ops;
  90
  91 static inline void smp_send_stop(void)
  92 {
  93         smp_ops.stop_other_cpus(0);
  94 }
  95
  96 static inline void stop_other_cpus(void)
  97 {
  98         smp_ops.stop_other_cpus(1);
  99 }
 100
 101 static inline void smp_prepare_boot_cpu(void)
 102 {
 103         smp_ops.smp_prepare_boot_cpu();
 104 }
 105
 106 static inline void smp_prepare_cpus(unsigned int max_cpus)
 107 {
 108         smp_ops.smp_prepare_cpus(max_cpus);
 109 }
 110
 111 static inline void smp_cpus_done(unsigned int max_cpus)
 112 {
 113         smp_ops.smp_cpus_done(max_cpus);
 114 }
 115
 116 static inline int __cpu_up(unsigned int cpu)
 117 {
 118         return smp_ops.cpu_up(cpu);
 119 }
 120
 121 static inline int __cpu_disable(void)
 122 {
 123         return smp_ops.cpu_disable();
 124 }
 125
 126 static inline void __cpu_die(unsigned int cpu)
 127 {
 128         smp_ops.cpu_die(cpu);
 129 }
 130
 131 static inline void play_dead(void)
 132 {
 133         smp_ops.play_dead();
 134 }
 135
 136 static inline void smp_send_reschedule(int cpu)
 137 {
 138         smp_ops.smp_send_reschedule(cpu);
 139 }
 140
 141 static inline void arch_send_call_function_single_ipi(int cpu)
 142 {
 143         smp_ops.send_call_func_single_ipi(cpu);
 144 }
 145
 146 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 147 {
 148         smp_ops.send_call_func_ipi(mask);
 149 }
 150
 151 void cpu_disable_common(void);
 152 void native_smp_prepare_boot_cpu(void);
 153 void native_smp_prepare_cpus(unsigned int max_cpus);
 154 void native_smp_cpus_done(unsigned int max_cpus);
 155 int native_cpu_up(unsigned int cpunum);
 156 int native_cpu_disable(void);
 157 void native_cpu_die(unsigned int cpu);
 158 void native_play_dead(void);
 159 void play_dead_common(void);
 160 void wbinvd_on_cpu(int cpu);
 161 int wbinvd_on_all_cpus(void);
 162
 163 void native_send_call_func_ipi(const struct cpumask *mask);
 164 void native_send_call_func_single_ipi(int cpu);
 165
 166 void smp_store_cpu_info(int id);
 167 #define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 168
 169 /* We don't mark CPUs online until __cpu_up(), so we need another measure */
 170 static inline int num_booting_cpus(void)
 171 {
 172         return cpumask_weight(cpu_callout_mask);
 173 }
 174 #else /* !CONFIG_SMP */
 175 #define wbinvd_on_cpu(cpu)     wbinvd()
 176 static inline int wbinvd_on_all_cpus(void)
 177 {
 178         wbinvd();
 179         return 0;
 180 }
 181 #endif /* CONFIG_SMP */
 182
 183 extern unsigned disabled_cpus __cpuinitdata;
 184
 185 #ifdef CONFIG_X86_32_SMP
 186 /*
 187  * This function is needed by all SMP systems. It must _always_ be valid
 188  * from the initial startup. We map APIC_BASE very early in page_setup(),
 189  * so this is correct in the x86 case.
 190  */
 191 #define raw_smp_processor_id() (percpu_read(cpu_number))
 192 extern int safe_smp_processor_id(void);
 193
 194 #elif defined(CONFIG_X86_64_SMP)
 195 #define raw_smp_processor_id() (percpu_read(cpu_number))
 196
 197 #define stack_smp_processor_id()                                        \
 198 ({                                                              \
 199         struct thread_info *ti;                                         \
 200         __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));      \
 201         ti->cpu;                                                        \
 202 })
 203 #define safe_smp_processor_id()         smp_processor_id()
 204
 205 #endif
 206
 207 #ifdef CONFIG_X86_LOCAL_APIC
 208
 209 #ifndef CONFIG_X86_64
 210 static inline int logical_smp_processor_id(void)
 211 {
 212         /* we don't want to mark this access volatile - bad code generation */
 213         return GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
 214 }
 215
 216 #endif
 217
 218 extern int hard_smp_processor_id(void);
 219
 220 #else /* CONFIG_X86_LOCAL_APIC */
 221
 222 # ifndef CONFIG_SMP
 223 #  define hard_smp_processor_id()       0
 224 # endif
 225
 226 #endif /* CONFIG_X86_LOCAL_APIC */
 227
 228 #ifdef CONFIG_DEBUG_NMI_SELFTEST
 229 extern void nmi_selftest(void);
 230 #else
 231 #define nmi_selftest() do { } while (0)
 232 #endif
 233
 234 #endif /* __ASSEMBLY__ */
 235 #endif /* _ASM_X86_SMP_H */