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smp.h
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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 
36 /* cpus sharing the last level cache: */
37 DECLARE_PER_CPU_READ_MOSTLY(cpumask_var_t, cpu_llc_shared_map);
38 DECLARE_PER_CPU_READ_MOSTLY(u16, cpu_llc_id);
39 DECLARE_PER_CPU_READ_MOSTLY(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_READ_MOSTLY(u16, x86_cpu_to_apicid);
57 DECLARE_EARLY_PER_CPU_READ_MOSTLY(u16, x86_bios_cpu_apicid);
58 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
59 DECLARE_EARLY_PER_CPU_READ_MOSTLY(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 task_struct;
66 
67 struct smp_ops {
69  void (*smp_prepare_cpus)(unsigned max_cpus);
70  void (*smp_cpus_done)(unsigned max_cpus);
71 
74 
75  int (*cpu_up)(unsigned cpu, struct task_struct *tidle);
77  void (*cpu_die)(unsigned int cpu);
79 
80  void (*send_call_func_ipi)(const struct cpumask *mask);
82 };
83 
84 /* Globals due to paravirt */
85 extern void set_cpu_sibling_map(int cpu);
86 
87 #ifdef CONFIG_SMP
88 #ifndef CONFIG_PARAVIRT
89 #define startup_ipi_hook(phys_apicid, start_eip, start_esp) do { } while (0)
90 #endif
91 extern struct smp_ops smp_ops;
92 
93 static inline void smp_send_stop(void)
94 {
96 }
97 
98 static inline void stop_other_cpus(void)
99 {
101 }
102 
103 static inline void smp_prepare_boot_cpu(void)
104 {
106 }
107 
108 static inline void smp_prepare_cpus(unsigned int max_cpus)
109 {
110  smp_ops.smp_prepare_cpus(max_cpus);
111 }
112 
113 static inline void smp_cpus_done(unsigned int max_cpus)
114 {
115  smp_ops.smp_cpus_done(max_cpus);
116 }
117 
118 static inline int __cpu_up(unsigned int cpu, struct task_struct *tidle)
119 {
120  return smp_ops.cpu_up(cpu, tidle);
121 }
122 
123 static inline int __cpu_disable(void)
124 {
125  return smp_ops.cpu_disable();
126 }
127 
128 static inline void __cpu_die(unsigned int cpu)
129 {
130  smp_ops.cpu_die(cpu);
131 }
132 
133 static inline void play_dead(void)
134 {
135  smp_ops.play_dead();
136 }
137 
138 static inline void smp_send_reschedule(int cpu)
139 {
141 }
142 
143 static inline void arch_send_call_function_single_ipi(int cpu)
144 {
146 }
147 
148 static inline void arch_send_call_function_ipi_mask(const struct cpumask *mask)
149 {
151 }
152 
153 void cpu_disable_common(void);
154 void native_smp_prepare_boot_cpu(void);
155 void native_smp_prepare_cpus(unsigned int max_cpus);
156 void native_smp_cpus_done(unsigned int max_cpus);
157 int native_cpu_up(unsigned int cpunum, struct task_struct *tidle);
158 int native_cpu_disable(void);
159 void native_cpu_die(unsigned int cpu);
160 void native_play_dead(void);
161 void play_dead_common(void);
162 void wbinvd_on_cpu(int cpu);
163 int wbinvd_on_all_cpus(void);
164 
165 void native_send_call_func_ipi(const struct cpumask *mask);
167 void x86_idle_thread_init(unsigned int cpu, struct task_struct *idle);
168 
169 void smp_store_cpu_info(int id);
170 #define cpu_physical_id(cpu) per_cpu(x86_cpu_to_apicid, cpu)
171 
172 #else /* !CONFIG_SMP */
173 #define wbinvd_on_cpu(cpu) wbinvd()
174 static inline int wbinvd_on_all_cpus(void)
175 {
176  wbinvd();
177  return 0;
178 }
179 #endif /* CONFIG_SMP */
180 
181 extern unsigned disabled_cpus __cpuinitdata;
182 
183 #ifdef CONFIG_X86_32_SMP
184 /*
185  * This function is needed by all SMP systems. It must _always_ be valid
186  * from the initial startup. We map APIC_BASE very early in page_setup(),
187  * so this is correct in the x86 case.
188  */
189 #define raw_smp_processor_id() (this_cpu_read(cpu_number))
190 extern int safe_smp_processor_id(void);
191 
192 #elif defined(CONFIG_X86_64_SMP)
193 #define raw_smp_processor_id() (this_cpu_read(cpu_number))
194 
195 #define stack_smp_processor_id() \
196 ({ \
197  struct thread_info *ti; \
198  __asm__("andq %%rsp,%0; ":"=r" (ti) : "0" (CURRENT_MASK)); \
199  ti->cpu; \
200 })
201 #define safe_smp_processor_id() smp_processor_id()
202 
203 #endif
204 
205 #ifdef CONFIG_X86_LOCAL_APIC
206 
207 #ifndef CONFIG_X86_64
208 static inline int logical_smp_processor_id(void)
209 {
210  /* we don't want to mark this access volatile - bad code generation */
211  return GET_APIC_LOGICAL_ID(apic_read(APIC_LDR));
212 }
213 
214 #endif
215 
216 extern int hard_smp_processor_id(void);
217 
218 #else /* CONFIG_X86_LOCAL_APIC */
219 
220 # ifndef CONFIG_SMP
221 # define hard_smp_processor_id() 0
222 # endif
223 
224 #endif /* CONFIG_X86_LOCAL_APIC */
225 
226 #ifdef CONFIG_DEBUG_NMI_SELFTEST
227 extern void nmi_selftest(void);
228 #else
229 #define nmi_selftest() do { } while (0)
230 #endif
231 
232 #endif /* __ASSEMBLY__ */
233 #endif /* _ASM_X86_SMP_H */