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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 extern ssize_t cpu_show_mds(struct device *dev,
 61                             struct device_attribute *attr, char *buf);
 62 extern ssize_t cpu_show_tsx_async_abort(struct device *dev,
 63                                         struct device_attribute *attr,
 64                                         char *buf);
 65 extern ssize_t cpu_show_itlb_multihit(struct device *dev,
 66                                       struct device_attribute *attr, char *buf);
 67 extern ssize_t cpu_show_srbds(struct device *dev, struct device_attribute *attr, char *buf);
 68 
 69 extern __printf(4, 5)
 70 struct device *cpu_device_create(struct device *parent, void *drvdata,
 71                                  const struct attribute_group **groups,
 72                                  const char *fmt, ...);
 73 #ifdef CONFIG_HOTPLUG_CPU
 74 extern void unregister_cpu(struct cpu *cpu);
 75 extern ssize_t arch_cpu_probe(const char *, size_t);
 76 extern ssize_t arch_cpu_release(const char *, size_t);
 77 #endif
 78 
 79 /*
 80  * These states are not related to the core CPU hotplug mechanism. They are
 81  * used by various (sub)architectures to track internal state
 82  */
 83 #define CPU_ONLINE              0x0002 /* CPU is up */
 84 #define CPU_UP_PREPARE          0x0003 /* CPU coming up */
 85 #define CPU_DEAD                0x0007 /* CPU dead */
 86 #define CPU_DEAD_FROZEN         0x0008 /* CPU timed out on unplug */
 87 #define CPU_POST_DEAD           0x0009 /* CPU successfully unplugged */
 88 #define CPU_BROKEN              0x000B /* CPU did not die properly */
 89 
 90 #ifdef CONFIG_SMP
 91 extern bool cpuhp_tasks_frozen;
 92 int add_cpu(unsigned int cpu);
 93 int cpu_device_up(struct device *dev);
 94 void notify_cpu_starting(unsigned int cpu);
 95 extern void cpu_maps_update_begin(void);
 96 extern void cpu_maps_update_done(void);
 97 int bringup_hibernate_cpu(unsigned int sleep_cpu);
 98 void bringup_nonboot_cpus(unsigned int setup_max_cpus);
 99 
100 #else   /* CONFIG_SMP */
101 #define cpuhp_tasks_frozen      0
102 
103 static inline void cpu_maps_update_begin(void)
104 {
105 }
106 
107 static inline void cpu_maps_update_done(void)
108 {
109 }
110 
111 static inline int add_cpu(unsigned int cpu) { return 0;}
112 
113 #endif /* CONFIG_SMP */
114 extern struct bus_type cpu_subsys;
115 
116 extern int lockdep_is_cpus_held(void);
117 
118 #ifdef CONFIG_HOTPLUG_CPU
119 extern void cpus_write_lock(void);
120 extern void cpus_write_unlock(void);
121 extern void cpus_read_lock(void);
122 extern void cpus_read_unlock(void);
123 extern int  cpus_read_trylock(void);
124 extern void lockdep_assert_cpus_held(void);
125 extern void cpu_hotplug_disable(void);
126 extern void cpu_hotplug_enable(void);
127 void clear_tasks_mm_cpumask(int cpu);
128 int remove_cpu(unsigned int cpu);
129 int cpu_device_down(struct device *dev);
130 extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu);
131 
132 #else /* CONFIG_HOTPLUG_CPU */
133 
134 static inline void cpus_write_lock(void) { }
135 static inline void cpus_write_unlock(void) { }
136 static inline void cpus_read_lock(void) { }
137 static inline void cpus_read_unlock(void) { }
138 static inline int  cpus_read_trylock(void) { return true; }
139 static inline void lockdep_assert_cpus_held(void) { }
140 static inline void cpu_hotplug_disable(void) { }
141 static inline void cpu_hotplug_enable(void) { }
142 static inline int remove_cpu(unsigned int cpu) { return -EPERM; }
143 static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { }
144 #endif  /* !CONFIG_HOTPLUG_CPU */
145 
146 /* Wrappers which go away once all code is converted */
147 static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
148 static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
149 static inline void get_online_cpus(void) { cpus_read_lock(); }
150 static inline void put_online_cpus(void) { cpus_read_unlock(); }
151 
152 #ifdef CONFIG_PM_SLEEP_SMP
153 extern int freeze_secondary_cpus(int primary);
154 extern void thaw_secondary_cpus(void);
155 
156 static inline int suspend_disable_secondary_cpus(void)
157 {
158         int cpu = 0;
159 
160         if (IS_ENABLED(CONFIG_PM_SLEEP_SMP_NONZERO_CPU))
161                 cpu = -1;
162 
163         return freeze_secondary_cpus(cpu);
164 }
165 static inline void suspend_enable_secondary_cpus(void)
166 {
167         return thaw_secondary_cpus();
168 }
169 
170 #else /* !CONFIG_PM_SLEEP_SMP */
171 static inline void thaw_secondary_cpus(void) {}
172 static inline int suspend_disable_secondary_cpus(void) { return 0; }
173 static inline void suspend_enable_secondary_cpus(void) { }
174 #endif /* !CONFIG_PM_SLEEP_SMP */
175 
176 void cpu_startup_entry(enum cpuhp_state state);
177 
178 void cpu_idle_poll_ctrl(bool enable);
179 
180 /* Attach to any functions which should be considered cpuidle. */
181 #define __cpuidle       __section(".cpuidle.text")
182 
183 bool cpu_in_idle(unsigned long pc);
184 
185 void arch_cpu_idle(void);
186 void arch_cpu_idle_prepare(void);
187 void arch_cpu_idle_enter(void);
188 void arch_cpu_idle_exit(void);
189 void arch_cpu_idle_dead(void);
190 
191 int cpu_report_state(int cpu);
192 int cpu_check_up_prepare(int cpu);
193 void cpu_set_state_online(int cpu);
194 void play_idle_precise(u64 duration_ns, u64 latency_ns);
195 
196 static inline void play_idle(unsigned long duration_us)
197 {
198         play_idle_precise(duration_us * NSEC_PER_USEC, U64_MAX);
199 }
200 
201 #ifdef CONFIG_HOTPLUG_CPU
202 bool cpu_wait_death(unsigned int cpu, int seconds);
203 bool cpu_report_death(void);
204 void cpuhp_report_idle_dead(void);
205 #else
206 static inline void cpuhp_report_idle_dead(void) { }
207 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
208 
209 enum cpuhp_smt_control {
210         CPU_SMT_ENABLED,
211         CPU_SMT_DISABLED,
212         CPU_SMT_FORCE_DISABLED,
213         CPU_SMT_NOT_SUPPORTED,
214         CPU_SMT_NOT_IMPLEMENTED,
215 };
216 
217 #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT)
218 extern enum cpuhp_smt_control cpu_smt_control;
219 extern void cpu_smt_disable(bool force);
220 extern void cpu_smt_check_topology(void);
221 extern bool cpu_smt_possible(void);
222 extern int cpuhp_smt_enable(void);
223 extern int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval);
224 #else
225 # define cpu_smt_control                (CPU_SMT_NOT_IMPLEMENTED)
226 static inline void cpu_smt_disable(bool force) { }
227 static inline void cpu_smt_check_topology(void) { }
228 static inline bool cpu_smt_possible(void) { return false; }
229 static inline int cpuhp_smt_enable(void) { return 0; }
230 static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; }
231 #endif
232 
233 extern bool cpu_mitigations_off(void);
234 extern bool cpu_mitigations_auto_nosmt(void);
235 
236 #endif /* _LINUX_CPU_H_ */
237 

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