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
  38 DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
  39 DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
  40
  41 /* Static state in head.S used to set up a CPU */
  42 extern struct {
  43         void *sp;
  44         unsigned short ss;
  45 } stack_start;
  46
  47 struct smp_ops {
  48         void (*smp_prepare_boot_cpu)(void);
  49         void (*smp_prepare_cpus)(unsigned max_cpus);
  50         int (*cpu_up)(unsigned cpu);
  51         void (*smp_cpus_done)(unsigned max_cpus);
  52
  53         void (*smp_send_stop)(void);
  54         void (*smp_send_reschedule)(int cpu);
  55
  56         void (*send_call_func_ipi)(cpumask_t mask);
  57         void (*send_call_func_single_ipi)(int cpu);
  58 };
  59
  60 /* Globals due to paravirt */
  61 extern void set_cpu_sibling_map(int cpu);
  62
  63 #ifdef CONFIG_SMP
  64 #ifndef CONFIG_PARAVIRT
  65 #define startup_ipi_hook(phys_apicid, start_eip, start_esp) do { } while (0)
  66 #endif
  67 extern struct smp_ops smp_ops;
  68
  69 static inline void smp_send_stop(void)
  70 {
  71         smp_ops.smp_send_stop();
  72 }
  73
  74 static inline void smp_prepare_boot_cpu(void)
  75 {
  76         smp_ops.smp_prepare_boot_cpu();
  77 }
  78
  79 static inline void smp_prepare_cpus(unsigned int max_cpus)
  80 {
  81         smp_ops.smp_prepare_cpus(max_cpus);
  82 }
  83
  84 static inline void smp_cpus_done(unsigned int max_cpus)
  85 {
  86         smp_ops.smp_cpus_done(max_cpus);
  87 }
  88
  89 static inline int __cpu_up(unsigned int cpu)
  90 {
  91         return smp_ops.cpu_up(cpu);
  92 }
  93
  94 static inline void smp_send_reschedule(int cpu)
  95 {
  96         smp_ops.smp_send_reschedule(cpu);
  97 }
  98
  99 static inline void arch_send_call_function_single_ipi(int cpu)
 100 {
 101         smp_ops.send_call_func_single_ipi(cpu);
 102 }
 103
 104 static inline void arch_send_call_function_ipi(cpumask_t mask)
 105 {
 106         smp_ops.send_call_func_ipi(mask);
 107 }
 108
 109 void native_smp_prepare_boot_cpu(void);
 110 void native_smp_prepare_cpus(unsigned int max_cpus);
 111 void native_smp_cpus_done(unsigned int max_cpus);
 112 int native_cpu_up(unsigned int cpunum);
 113 void native_send_call_func_ipi(cpumask_t mask);
 114 void native_send_call_func_single_ipi(int cpu);
 115
 116 extern int __cpu_disable(void);
 117 extern void __cpu_die(unsigned int cpu);
 118
 119 void smp_store_cpu_info(int id);
 120 #define cpu_physical_id(cpu)    per_cpu(x86_cpu_to_apicid, cpu)
 121
 122 /* We don't mark CPUs online until __cpu_up(), so we need another measure */
 123 static inline int num_booting_cpus(void)
 124 {
 125         return cpus_weight(cpu_callout_map);
 126 }
 127 #endif /* CONFIG_SMP */
 128
 129 #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_CPU)
 130 extern void prefill_possible_map(void);
 131 #else
 132 static inline void prefill_possible_map(void)
 133 {
 134 }
 135 #endif
 136
 137 extern unsigned disabled_cpus __cpuinitdata;
 138
 139 #ifdef CONFIG_X86_32_SMP
 140 /*
 141  * This function is needed by all SMP systems. It must _always_ be valid
 142  * from the initial startup. We map APIC_BASE very early in page_setup(),
 143  * so this is correct in the x86 case.
 144  */
 145 DECLARE_PER_CPU(int, cpu_number);
 146 #define raw_smp_processor_id() (x86_read_percpu(cpu_number))
 147 extern int safe_smp_processor_id(void);
 148
 149 #elif defined(CONFIG_X86_64_SMP)
 150 #define raw_smp_processor_id()  read_pda(cpunumber)
 151
 152 #define stack_smp_processor_id()                                        \
 153 ({                                                              \
 154         struct thread_info *ti;                                         \
 155         __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK));      \
 156         ti->cpu;                                                        \
 157 })
 158 #define safe_smp_processor_id()         smp_processor_id()
 159
 160 #else /* !CONFIG_X86_32_SMP && !CONFIG_X86_64_SMP */
 161 #define cpu_physical_id(cpu)            boot_cpu_physical_apicid
 162 #define safe_smp_processor_id()         0
 163 #define stack_smp_processor_id()        0
 164 #endif
 165
 166 #ifdef CONFIG_X86_LOCAL_APIC
 167
 168 static inline int logical_smp_processor_id(void)
 169 {
 170         /* we don't want to mark this access volatile - bad code generation */
 171         return GET_APIC_LOGICAL_ID(*(u32 *)(APIC_BASE + APIC_LDR));
 172 }
 173
 174 #ifndef CONFIG_X86_64
 175 static inline unsigned int read_apic_id(void)
 176 {
 177         return *(u32 *)(APIC_BASE + APIC_ID);
 178 }
 179 #else
 180 extern unsigned int read_apic_id(void);
 181 #endif
 182
 183
 184 # ifdef APIC_DEFINITION
 185 extern int hard_smp_processor_id(void);
 186 # else
 187 #  include <mach_apicdef.h>
 188 static inline int hard_smp_processor_id(void)
 189 {
 190         /* we don't want to mark this access volatile - bad code generation */
 191         return GET_APIC_ID(read_apic_id());
 192 }
 193 # endif /* APIC_DEFINITION */
 194
 195 #else /* CONFIG_X86_LOCAL_APIC */
 196
 197 # ifndef CONFIG_SMP
 198 #  define hard_smp_processor_id()       0
 199 # endif
 200
 201 #endif /* CONFIG_X86_LOCAL_APIC */
 202
 203 #ifdef CONFIG_HOTPLUG_CPU
 204 extern void cpu_uninit(void);
 205 #endif
 206
 207 #endif /* __ASSEMBLY__ */
 208 #endif