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 | #include <linux/cpu_smt.h> |
22 | |
23 | struct device; |
24 | struct device_node; |
25 | struct attribute_group; |
26 | |
27 | struct cpu { |
28 | int node_id; /* The node which contains the CPU */ |
29 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
30 | struct device dev; |
31 | }; |
32 | |
33 | extern void boot_cpu_init(void); |
34 | extern void boot_cpu_hotplug_init(void); |
35 | extern void cpu_init(void); |
36 | extern void trap_init(void); |
37 | |
38 | extern int register_cpu(struct cpu *cpu, int num); |
39 | extern struct device *get_cpu_device(unsigned cpu); |
40 | extern bool cpu_is_hotpluggable(unsigned cpu); |
41 | extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id); |
42 | extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun, |
43 | int cpu, unsigned int *thread); |
44 | |
45 | extern int cpu_add_dev_attr(struct device_attribute *attr); |
46 | extern void cpu_remove_dev_attr(struct device_attribute *attr); |
47 | |
48 | extern int cpu_add_dev_attr_group(struct attribute_group *attrs); |
49 | extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); |
50 | |
51 | extern ssize_t cpu_show_meltdown(struct device *dev, |
52 | struct device_attribute *attr, char *buf); |
53 | extern ssize_t cpu_show_spectre_v1(struct device *dev, |
54 | struct device_attribute *attr, char *buf); |
55 | extern ssize_t cpu_show_spectre_v2(struct device *dev, |
56 | struct device_attribute *attr, char *buf); |
57 | extern ssize_t cpu_show_spec_store_bypass(struct device *dev, |
58 | struct device_attribute *attr, char *buf); |
59 | extern ssize_t cpu_show_l1tf(struct device *dev, |
60 | struct device_attribute *attr, char *buf); |
61 | extern ssize_t cpu_show_mds(struct device *dev, |
62 | struct device_attribute *attr, char *buf); |
63 | extern ssize_t cpu_show_tsx_async_abort(struct device *dev, |
64 | struct device_attribute *attr, |
65 | char *buf); |
66 | extern ssize_t cpu_show_itlb_multihit(struct device *dev, |
67 | struct device_attribute *attr, char *buf); |
68 | extern ssize_t cpu_show_srbds(struct device *dev, struct device_attribute *attr, char *buf); |
69 | extern ssize_t cpu_show_mmio_stale_data(struct device *dev, |
70 | struct device_attribute *attr, |
71 | char *buf); |
72 | extern ssize_t cpu_show_retbleed(struct device *dev, |
73 | struct device_attribute *attr, char *buf); |
74 | extern ssize_t cpu_show_spec_rstack_overflow(struct device *dev, |
75 | struct device_attribute *attr, char *buf); |
76 | extern ssize_t cpu_show_gds(struct device *dev, |
77 | struct device_attribute *attr, char *buf); |
78 | |
79 | extern __printf(4, 5) |
80 | struct device *cpu_device_create(struct device *parent, void *drvdata, |
81 | const struct attribute_group **groups, |
82 | const char *fmt, ...); |
83 | extern int arch_register_cpu(int cpu); |
84 | extern void arch_unregister_cpu(int cpu); |
85 | #ifdef CONFIG_HOTPLUG_CPU |
86 | extern void unregister_cpu(struct cpu *cpu); |
87 | extern ssize_t arch_cpu_probe(const char *, size_t); |
88 | extern ssize_t arch_cpu_release(const char *, size_t); |
89 | #endif |
90 | |
91 | /* |
92 | * These states are not related to the core CPU hotplug mechanism. They are |
93 | * used by various (sub)architectures to track internal state |
94 | */ |
95 | #define CPU_ONLINE 0x0002 /* CPU is up */ |
96 | #define CPU_UP_PREPARE 0x0003 /* CPU coming up */ |
97 | #define CPU_DEAD 0x0007 /* CPU dead */ |
98 | #define CPU_DEAD_FROZEN 0x0008 /* CPU timed out on unplug */ |
99 | #define CPU_POST_DEAD 0x0009 /* CPU successfully unplugged */ |
100 | #define CPU_BROKEN 0x000B /* CPU did not die properly */ |
101 | |
102 | #ifdef CONFIG_SMP |
103 | extern bool cpuhp_tasks_frozen; |
104 | int add_cpu(unsigned int cpu); |
105 | int cpu_device_up(struct device *dev); |
106 | void notify_cpu_starting(unsigned int cpu); |
107 | extern void cpu_maps_update_begin(void); |
108 | extern void cpu_maps_update_done(void); |
109 | int bringup_hibernate_cpu(unsigned int sleep_cpu); |
110 | void bringup_nonboot_cpus(unsigned int setup_max_cpus); |
111 | |
112 | #else /* CONFIG_SMP */ |
113 | #define cpuhp_tasks_frozen 0 |
114 | |
115 | static inline void cpu_maps_update_begin(void) |
116 | { |
117 | } |
118 | |
119 | static inline void cpu_maps_update_done(void) |
120 | { |
121 | } |
122 | |
123 | static inline int add_cpu(unsigned int cpu) { return 0;} |
124 | |
125 | #endif /* CONFIG_SMP */ |
126 | extern struct bus_type cpu_subsys; |
127 | |
128 | extern int lockdep_is_cpus_held(void); |
129 | |
130 | #ifdef CONFIG_HOTPLUG_CPU |
131 | extern void cpus_write_lock(void); |
132 | extern void cpus_write_unlock(void); |
133 | extern void cpus_read_lock(void); |
134 | extern void cpus_read_unlock(void); |
135 | extern int cpus_read_trylock(void); |
136 | extern void lockdep_assert_cpus_held(void); |
137 | extern void cpu_hotplug_disable(void); |
138 | extern void cpu_hotplug_enable(void); |
139 | void clear_tasks_mm_cpumask(int cpu); |
140 | int remove_cpu(unsigned int cpu); |
141 | int cpu_device_down(struct device *dev); |
142 | extern void smp_shutdown_nonboot_cpus(unsigned int primary_cpu); |
143 | |
144 | #else /* CONFIG_HOTPLUG_CPU */ |
145 | |
146 | static inline void cpus_write_lock(void) { } |
147 | static inline void cpus_write_unlock(void) { } |
148 | static inline void cpus_read_lock(void) { } |
149 | static inline void cpus_read_unlock(void) { } |
150 | static inline int cpus_read_trylock(void) { return true; } |
151 | static inline void lockdep_assert_cpus_held(void) { } |
152 | static inline void cpu_hotplug_disable(void) { } |
153 | static inline void cpu_hotplug_enable(void) { } |
154 | static inline int remove_cpu(unsigned int cpu) { return -EPERM; } |
155 | static inline void smp_shutdown_nonboot_cpus(unsigned int primary_cpu) { } |
156 | #endif /* !CONFIG_HOTPLUG_CPU */ |
157 | |
158 | DEFINE_LOCK_GUARD_0(cpus_read_lock, cpus_read_lock(), cpus_read_unlock()) |
159 | |
160 | #ifdef CONFIG_PM_SLEEP_SMP |
161 | extern int freeze_secondary_cpus(int primary); |
162 | extern void thaw_secondary_cpus(void); |
163 | |
164 | static inline int suspend_disable_secondary_cpus(void) |
165 | { |
166 | int cpu = 0; |
167 | |
168 | if (IS_ENABLED(CONFIG_PM_SLEEP_SMP_NONZERO_CPU)) |
169 | cpu = -1; |
170 | |
171 | return freeze_secondary_cpus(primary: cpu); |
172 | } |
173 | static inline void suspend_enable_secondary_cpus(void) |
174 | { |
175 | return thaw_secondary_cpus(); |
176 | } |
177 | |
178 | #else /* !CONFIG_PM_SLEEP_SMP */ |
179 | static inline void thaw_secondary_cpus(void) {} |
180 | static inline int suspend_disable_secondary_cpus(void) { return 0; } |
181 | static inline void suspend_enable_secondary_cpus(void) { } |
182 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
183 | |
184 | void __noreturn cpu_startup_entry(enum cpuhp_state state); |
185 | |
186 | void cpu_idle_poll_ctrl(bool enable); |
187 | |
188 | bool cpu_in_idle(unsigned long pc); |
189 | |
190 | void arch_cpu_idle(void); |
191 | void arch_cpu_idle_prepare(void); |
192 | void arch_cpu_idle_enter(void); |
193 | void arch_cpu_idle_exit(void); |
194 | void __noreturn arch_cpu_idle_dead(void); |
195 | |
196 | #ifdef CONFIG_ARCH_HAS_CPU_FINALIZE_INIT |
197 | void arch_cpu_finalize_init(void); |
198 | #else |
199 | static inline void arch_cpu_finalize_init(void) { } |
200 | #endif |
201 | |
202 | void play_idle_precise(u64 duration_ns, u64 latency_ns); |
203 | |
204 | static inline void play_idle(unsigned long duration_us) |
205 | { |
206 | play_idle_precise(duration_ns: duration_us * NSEC_PER_USEC, U64_MAX); |
207 | } |
208 | |
209 | #ifdef CONFIG_HOTPLUG_CPU |
210 | void cpuhp_report_idle_dead(void); |
211 | #else |
212 | static inline void cpuhp_report_idle_dead(void) { } |
213 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
214 | |
215 | extern bool cpu_mitigations_off(void); |
216 | extern bool cpu_mitigations_auto_nosmt(void); |
217 | |
218 | #endif /* _LINUX_CPU_H_ */ |
219 | |