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TOMOYO Linux Cross Reference
Linux/include/linux/cpu.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 /*
  3  * include/linux/cpu.h - generic cpu definition
  4  *
  5  * This is mainly for topological representation. We define the 
  6  * basic 'struct cpu' here, which can be embedded in per-arch 
  7  * definitions of processors.
  8  *
  9  * Basic handling of the devices is done in drivers/base/cpu.c
 10  *
 11  * CPUs are exported via sysfs in the devices/system/cpu
 12  * directory. 
 13  */
 14 #ifndef _LINUX_CPU_H_
 15 #define _LINUX_CPU_H_
 16 
 17 #include <linux/node.h>
 18 #include <linux/compiler.h>
 19 #include <linux/cpumask.h>
 20 #include <linux/cpuhotplug.h>
 21 
 22 struct device;
 23 struct device_node;
 24 struct attribute_group;
 25 
 26 struct cpu {
 27         int node_id;            /* The node which contains the CPU */
 28         int hotpluggable;       /* creates sysfs control file if hotpluggable */
 29         struct device dev;
 30 };
 31 
 32 extern void boot_cpu_init(void);
 33 extern void boot_cpu_hotplug_init(void);
 34 extern void cpu_init(void);
 35 extern void trap_init(void);
 36 
 37 extern int register_cpu(struct cpu *cpu, int num);
 38 extern struct device *get_cpu_device(unsigned cpu);
 39 extern bool cpu_is_hotpluggable(unsigned cpu);
 40 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
 41 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
 42                                               int cpu, unsigned int *thread);
 43 
 44 extern int cpu_add_dev_attr(struct device_attribute *attr);
 45 extern void cpu_remove_dev_attr(struct device_attribute *attr);
 46 
 47 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
 48 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
 49 
 50 extern ssize_t cpu_show_meltdown(struct device *dev,
 51                                  struct device_attribute *attr, char *buf);
 52 extern ssize_t cpu_show_spectre_v1(struct device *dev,
 53                                    struct device_attribute *attr, char *buf);
 54 extern ssize_t cpu_show_spectre_v2(struct device *dev,
 55                                    struct device_attribute *attr, char *buf);
 56 extern ssize_t cpu_show_spec_store_bypass(struct device *dev,
 57                                           struct device_attribute *attr, char *buf);
 58 extern ssize_t cpu_show_l1tf(struct device *dev,
 59                              struct device_attribute *attr, char *buf);
 60 
 61 extern __printf(4, 5)
 62 struct device *cpu_device_create(struct device *parent, void *drvdata,
 63                                  const struct attribute_group **groups,
 64                                  const char *fmt, ...);
 65 #ifdef CONFIG_HOTPLUG_CPU
 66 extern void unregister_cpu(struct cpu *cpu);
 67 extern ssize_t arch_cpu_probe(const char *, size_t);
 68 extern ssize_t arch_cpu_release(const char *, size_t);
 69 #endif
 70 
 71 /*
 72  * These states are not related to the core CPU hotplug mechanism. They are
 73  * used by various (sub)architectures to track internal state
 74  */
 75 #define CPU_ONLINE              0x0002 /* CPU is up */
 76 #define CPU_UP_PREPARE          0x0003 /* CPU coming up */
 77 #define CPU_DEAD                0x0007 /* CPU dead */
 78 #define CPU_DEAD_FROZEN         0x0008 /* CPU timed out on unplug */
 79 #define CPU_POST_DEAD           0x0009 /* CPU successfully unplugged */
 80 #define CPU_BROKEN              0x000B /* CPU did not die properly */
 81 
 82 #ifdef CONFIG_SMP
 83 extern bool cpuhp_tasks_frozen;
 84 int cpu_up(unsigned int cpu);
 85 void notify_cpu_starting(unsigned int cpu);
 86 extern void cpu_maps_update_begin(void);
 87 extern void cpu_maps_update_done(void);
 88 
 89 #else   /* CONFIG_SMP */
 90 #define cpuhp_tasks_frozen      0
 91 
 92 static inline void cpu_maps_update_begin(void)
 93 {
 94 }
 95 
 96 static inline void cpu_maps_update_done(void)
 97 {
 98 }
 99 
100 #endif /* CONFIG_SMP */
101 extern struct bus_type cpu_subsys;
102 
103 #ifdef CONFIG_HOTPLUG_CPU
104 extern void cpus_write_lock(void);
105 extern void cpus_write_unlock(void);
106 extern void cpus_read_lock(void);
107 extern void cpus_read_unlock(void);
108 extern int  cpus_read_trylock(void);
109 extern void lockdep_assert_cpus_held(void);
110 extern void cpu_hotplug_disable(void);
111 extern void cpu_hotplug_enable(void);
112 void clear_tasks_mm_cpumask(int cpu);
113 int cpu_down(unsigned int cpu);
114 
115 #else /* CONFIG_HOTPLUG_CPU */
116 
117 static inline void cpus_write_lock(void) { }
118 static inline void cpus_write_unlock(void) { }
119 static inline void cpus_read_lock(void) { }
120 static inline void cpus_read_unlock(void) { }
121 static inline int  cpus_read_trylock(void) { return true; }
122 static inline void lockdep_assert_cpus_held(void) { }
123 static inline void cpu_hotplug_disable(void) { }
124 static inline void cpu_hotplug_enable(void) { }
125 #endif  /* !CONFIG_HOTPLUG_CPU */
126 
127 /* Wrappers which go away once all code is converted */
128 static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
129 static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
130 static inline void get_online_cpus(void) { cpus_read_lock(); }
131 static inline void put_online_cpus(void) { cpus_read_unlock(); }
132 
133 #ifdef CONFIG_PM_SLEEP_SMP
134 extern int freeze_secondary_cpus(int primary);
135 static inline int disable_nonboot_cpus(void)
136 {
137         return freeze_secondary_cpus(0);
138 }
139 extern void enable_nonboot_cpus(void);
140 #else /* !CONFIG_PM_SLEEP_SMP */
141 static inline int disable_nonboot_cpus(void) { return 0; }
142 static inline void enable_nonboot_cpus(void) {}
143 #endif /* !CONFIG_PM_SLEEP_SMP */
144 
145 void cpu_startup_entry(enum cpuhp_state state);
146 
147 void cpu_idle_poll_ctrl(bool enable);
148 
149 /* Attach to any functions which should be considered cpuidle. */
150 #define __cpuidle       __attribute__((__section__(".cpuidle.text")))
151 
152 bool cpu_in_idle(unsigned long pc);
153 
154 void arch_cpu_idle(void);
155 void arch_cpu_idle_prepare(void);
156 void arch_cpu_idle_enter(void);
157 void arch_cpu_idle_exit(void);
158 void arch_cpu_idle_dead(void);
159 
160 int cpu_report_state(int cpu);
161 int cpu_check_up_prepare(int cpu);
162 void cpu_set_state_online(int cpu);
163 void play_idle(unsigned long duration_ms);
164 
165 #ifdef CONFIG_HOTPLUG_CPU
166 bool cpu_wait_death(unsigned int cpu, int seconds);
167 bool cpu_report_death(void);
168 void cpuhp_report_idle_dead(void);
169 #else
170 static inline void cpuhp_report_idle_dead(void) { }
171 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
172 
173 enum cpuhp_smt_control {
174         CPU_SMT_ENABLED,
175         CPU_SMT_DISABLED,
176         CPU_SMT_FORCE_DISABLED,
177         CPU_SMT_NOT_SUPPORTED,
178 };
179 
180 #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT)
181 extern enum cpuhp_smt_control cpu_smt_control;
182 extern void cpu_smt_disable(bool force);
183 extern void cpu_smt_check_topology(void);
184 #else
185 # define cpu_smt_control                (CPU_SMT_ENABLED)
186 static inline void cpu_smt_disable(bool force) { }
187 static inline void cpu_smt_check_topology(void) { }
188 #endif
189 
190 #endif /* _LINUX_CPU_H_ */
191 

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