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 #include <asm/cpufeature.h>
  20
  21 extern int smp_num_siblings;
  22 extern unsigned int num_processors;
  23
  24 static inline bool cpu_has_ht_siblings(void)
  25 {
  26         bool has_siblings = false;
  27 #ifdef CONFIG_SMP
  28         has_siblings = cpu_has_ht && smp_num_siblings > 1;
  29 #endif
  30         return has_siblings;
  31 }
  32
  33 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_sibling_map);
  34 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_core_map);
  35 /* cpus sharing the last level cache: */
  36 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
  37 DECLARE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id);
  38 DECLARE_PER_CPU_READ_MOSTLY(int, cpu_number);
  39
  40 static inline struct cpumask *cpu_sibling_mask(int cpu)
  41 {
  42         return per_cpu(cpu_sibling_map, cpu);
  43 }
  44
  45 static inline struct cpumask *cpu_core_mask(int cpu)
  46 {
  47         return per_cpu(cpu_core_map, cpu);
  48 }
  49
  50 static inline struct cpumask *cpu_llc_shared_mask(int cpu)
  51 {
  52         return per_cpu(cpu_llc_shared_map, cpu);
  53 }
  54
  55 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_cpu_to_apicid);
  56 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
  57 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
  58 DECLARE_EARLY_PER_CPU_READ_MOSTLY(int, x86_cpu_to_logical_apicid);
  59 #endif
  60
  61 /* Static state in head.S used to set up a CPU */
  62 extern unsigned long stack_start; /* Initial stack pointer address */
  63
  64 struct task_struct;
  65
  66 struct smp_ops {
  67         void (*smp_prepare_boot_cpu)(void);
  68         void (*smp_prepare_cpus)(unsigned max_cpus);
  69         void (*smp_cpus_done)(unsigned max_cpus);
  70
  71         void (*stop_other_cpus)(int wait);
  72         void (*smp_send_reschedule)(int cpu);
  73
  74         int (*cpu_up)(unsigned cpu, struct task_struct *tidle);
  75         int (*cpu_disable)(void);
  76         void (*cpu_die)(unsigned int cpu);
  77         void (*play_dead)(void);
  78
  79         void (*send_call_func_ipi)(const struct cpumask *mask);
  80         void (*send_call_func_single_ipi)(int cpu);
  81 };
  82
  83 /* Globals due to paravirt */
  84 extern void set_cpu_sibling_map(int cpu);
  85
  86 #ifdef CONFIG_SMP
  87 #ifndef CONFIG_PARAVIRT
  88 #define startup_ipi_hook(phys_apicid, start_eip, start_esp) do { } while (0)
  89 #endif
  90 extern struct smp_ops smp_ops;
  91
  92 static inline void smp_send_stop(void)
  93 {
  94         smp_ops.stop_other_cpus(0);
  95 }
  96
  97 static inline void stop_other_cpus(void)
  98 {
  99         smp_ops.stop_other_cpus(1);
 100 }
 101
 102 static inline void smp_prepare_boot_cpu(void)
 103 {
 104         smp_ops.smp_prepare_boot_cpu();
 105 }
 106
 107 static inline void smp_prepare_cpus(unsigned int max_cpus)
 108 {
 109         smp_ops.smp_prepare_cpus(max_cpus);
 110 }
 111
 112 static inline void smp_cpus_done(unsigned int max_cpus)
 113 {
 114         smp_ops.smp_cpus_done(max_cpus);
 115 }
 116
 117 static inline int __cpu_up(unsigned int cpu, struct task_struct *tidle)
 118 {
 119         return smp_ops.cpu_up(cpu, tidle);
 120 }
 121
 122 static inline int __cpu_disable(void)
 123 {
 124         return smp_ops.cpu_disable();
 125 }
 126
 127 static inline void __cpu_die(unsigned int cpu)
 128 {
 129         smp_ops.cpu_die(cpu);
 130 }
 131
 132 static inline void play_dead(void)
 133 {
 134         smp_ops.play_dead();
 135 }
 136
 137 static inline void smp_send_reschedule(int cpu)
 138 {
 139         smp_ops.smp_send_reschedule(cpu);
 140 }
 141
 142 static inline void arch_send_call_function_single_ipi(int cpu)
 143 {
 144         smp_ops.send_call_func_single_ipi(cpu);
 145 }
 146
 147 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
 148 {
 149         smp_ops.send_call_func_ipi(mask);
 150 }
 151
 152 void cpu_disable_common(void);
 153 void native_smp_prepare_boot_cpu(void);
 154 void native_smp_prepare_cpus(unsigned int max_cpus);
 155 void native_smp_cpus_done(unsigned int max_cpus);
 156 void common_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 157 int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
 158 int native_cpu_disable(void);
 159 int common_cpu_die(unsigned int cpu);
 160 void native_cpu_die(unsigned int cpu);
 161 void native_play_dead(void);
 162 void play_dead_common(void);
 163 void wbinvd_on_cpu(int cpu);
 164 int wbinvd_on_all_cpus(void);
 165
 166 void native_send_call_func_ipi(const struct cpumask *mask);
 167 void native_send_call_func_single_ipi(int cpu);
 168 void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
 169
 170 void smp_store_boot_cpu_info(void);
 171 void smp_store_cpu_info(int id);
 172 #define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 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;
 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() (this_cpu_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() (this_cpu_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 */