include/asm-x86/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/pda.h>
  19 #include <asm/thread_info.h>
  20
  21 extern cpumask_t cpu_callout_map;
  22 extern cpumask_t cpu_initialized;
  23 extern cpumask_t cpu_callin_map;
  24
  25 extern void (*mtrr_hook)(void);
  26 extern void zap_low_mappings(void);
  27
  28 extern int __cpuinit get_local_pda(int cpu);
  29
  30 extern int smp_num_siblings;
  31 extern unsigned int num_processors;
  32 extern cpumask_t cpu_initialized;
  33
  34 DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
  35 DECLARE_PER_CPU(cpumask_t, cpu_core_map);
  36 DECLARE_PER_CPU(u16, cpu_llc_id);
  37 #ifdef CONFIG_X86_32
  38 DECLARE_PER_CPU(int, cpu_number);
  39 #endif
  40
  41 DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
  42 DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
  43
  44 /* Static state in head.S used to set up a CPU */
  45 extern struct {
  46         void *sp;
  47         unsigned short ss;
  48 } stack_start;
  49
  50 struct smp_ops {
  51         void (*smp_prepare_boot_cpu)(void);
  52         void (*smp_prepare_cpus)(unsigned max_cpus);
  53         int (*cpu_up)(unsigned cpu);
  54         void (*smp_cpus_done)(unsigned max_cpus);
  55
  56         void (*smp_send_stop)(void);
  57         void (*smp_send_reschedule)(int cpu);
  58
  59         void (*send_call_func_ipi)(cpumask_t 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 #ifndef CONFIG_PARAVIRT
  68 #define startup_ipi_hook(phys_apicid, start_eip, start_esp) do { } while (0)
  69 #endif
  70 extern struct smp_ops smp_ops;
  71
  72 static inline void smp_send_stop(void)
  73 {
  74         smp_ops.smp_send_stop();
  75 }
  76
  77 static inline void smp_prepare_boot_cpu(void)
  78 {
  79         smp_ops.smp_prepare_boot_cpu();
  80 }
  81
  82 static inline void smp_prepare_cpus(unsigned int max_cpus)
  83 {
  84         smp_ops.smp_prepare_cpus(max_cpus);
  85 }
  86
  87 static inline void smp_cpus_done(unsigned int max_cpus)
  88 {
  89         smp_ops.smp_cpus_done(max_cpus);
  90 }
  91
  92 static inline int __cpu_up(unsigned int cpu)
  93 {
  94         return smp_ops.cpu_up(cpu);
  95 }
  96
  97 static inline void smp_send_reschedule(int cpu)
  98 {
  99         smp_ops.smp_send_reschedule(cpu);
 100 }
 101
 102 static inline void arch_send_call_function_single_ipi(int cpu)
 103 {
 104         smp_ops.send_call_func_single_ipi(cpu);
 105 }
 106
 107 static inline void arch_send_call_function_ipi(cpumask_t mask)
 108 {
 109         smp_ops.send_call_func_ipi(mask);
 110 }
 111
 112 void native_smp_prepare_boot_cpu(void);
 113 void native_smp_prepare_cpus(unsigned int max_cpus);
 114 void native_smp_cpus_done(unsigned int max_cpus);
 115 int native_cpu_up(unsigned int cpunum);
 116 void native_send_call_func_ipi(cpumask_t mask);
 117 void native_send_call_func_single_ipi(int cpu);
 118
 119 extern int __cpu_disable(void);
 120 extern void __cpu_die(unsigned int cpu);
 121
 122 void smp_store_cpu_info(int id);
 123 #define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 124
 125 /* We don't mark CPUs online until __cpu_up(), so we need another measure */
 126 static inline int num_booting_cpus(void)
 127 {
 128         return cpus_weight(cpu_callout_map);
 129 }
 130 #endif /* CONFIG_SMP */
 131
 132 #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_CPU)
 133 extern void prefill_possible_map(void);
 134 #else
 135 static inline void prefill_possible_map(void)
 136 {
 137 }
 138 #endif
 139
 140 extern unsigned disabled_cpus __cpuinitdata;
 141
 142 #ifdef CONFIG_X86_32_SMP
 143 /*
 144  * This function is needed by all SMP systems. It must _always_ be valid
 145  * from the initial startup. We map APIC_BASE very early in page_setup(),
 146  * so this is correct in the x86 case.
 147  */
 148 #define raw_smp_processor_id() (x86_read_percpu(cpu_number))
 149 extern int safe_smp_processor_id(void);
 150
 151 #elif defined(CONFIG_X86_64_SMP)
 152 #define raw_smp_processor_id()  read_pda(cpunumber)
 153
 154 #define stack_smp_processor_id()                                        \
 155 ({                                                              \
 156         struct thread_info *ti;                                         \
 157         __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));      \
 158         ti->cpu;                                                        \
 159 })
 160 #define safe_smp_processor_id()         smp_processor_id()
 161
 162 #else /* !CONFIG_X86_32_SMP && !CONFIG_X86_64_SMP */
 163 #define cpu_physical_id(cpu)            boot_cpu_physical_apicid
 164 #define safe_smp_processor_id()         0
 165 #define stack_smp_processor_id()        0
 166 #endif
 167
 168 #ifdef CONFIG_X86_LOCAL_APIC
 169
 170 static inline int logical_smp_processor_id(void)
 171 {
 172         /* we don't want to mark this access volatile - bad code generation */
 173         return GET_APIC_LOGICAL_ID(*(u32 *)(APIC_BASE + APIC_LDR));
 174 }
 175
 176 #ifndef CONFIG_X86_64
 177 static inline unsigned int read_apic_id(void)
 178 {
 179         return *(u32 *)(APIC_BASE + APIC_ID);
 180 }
 181 #else
 182 extern unsigned int read_apic_id(void);
 183 #endif
 184
 185
 186 # ifdef APIC_DEFINITION
 187 extern int hard_smp_processor_id(void);
 188 # else
 189 #  include <mach_apicdef.h>
 190 static inline int hard_smp_processor_id(void)
 191 {
 192         /* we don't want to mark this access volatile - bad code generation */
 193         return GET_APIC_ID(read_apic_id());
 194 }
 195 # endif /* APIC_DEFINITION */
 196
 197 #else /* CONFIG_X86_LOCAL_APIC */
 198
 199 # ifndef CONFIG_SMP
 200 #  define hard_smp_processor_id()       0
 201 # endif
 202
 203 #endif /* CONFIG_X86_LOCAL_APIC */
 204
 205 #ifdef CONFIG_HOTPLUG_CPU
 206 extern void cpu_uninit(void);
 207 #endif
 208
 209 #endif /* __ASSEMBLY__ */
 210 #endif /* ASM_X86__SMP_H */