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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
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 | |
1da177e4 | 10 | * |
611a75e1 | 11 | * CPUs are exported via sysfs in the devices/system/cpu |
1da177e4 | 12 | * directory. |
1da177e4 LT |
13 | */ |
14 | #ifndef _LINUX_CPU_H_ | |
15 | #define _LINUX_CPU_H_ | |
16 | ||
1da177e4 LT |
17 | #include <linux/node.h> |
18 | #include <linux/compiler.h> | |
19 | #include <linux/cpumask.h> | |
cff7d378 | 20 | #include <linux/cpuhotplug.h> |
1da177e4 | 21 | |
313162d0 | 22 | struct device; |
d1cb9d1a | 23 | struct device_node; |
3d52943b | 24 | struct attribute_group; |
313162d0 | 25 | |
1da177e4 LT |
26 | struct cpu { |
27 | int node_id; /* The node which contains the CPU */ | |
72486f1f | 28 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
8a25a2fd | 29 | struct device dev; |
1da177e4 LT |
30 | }; |
31 | ||
cff7d378 | 32 | extern void boot_cpu_init(void); |
d403c57a | 33 | extern void boot_cpu_hotplug_init(void); |
1777e463 IM |
34 | extern void cpu_init(void); |
35 | extern void trap_init(void); | |
cff7d378 | 36 | |
76b67ed9 | 37 | extern int register_cpu(struct cpu *cpu, int num); |
8a25a2fd | 38 | extern struct device *get_cpu_device(unsigned cpu); |
2987557f | 39 | extern bool cpu_is_hotpluggable(unsigned cpu); |
183912d3 | 40 | extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id); |
d1cb9d1a DM |
41 | extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun, |
42 | int cpu, unsigned int *thread); | |
0344c6c5 | 43 | |
8a25a2fd KS |
44 | extern int cpu_add_dev_attr(struct device_attribute *attr); |
45 | extern void cpu_remove_dev_attr(struct device_attribute *attr); | |
0344c6c5 | 46 | |
8a25a2fd KS |
47 | extern int cpu_add_dev_attr_group(struct attribute_group *attrs); |
48 | extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); | |
0344c6c5 | 49 | |
87590ce6 TG |
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); | |
d7de9182 KRW |
56 | extern ssize_t cpu_show_spec_store_bypass(struct device *dev, |
57 | struct device_attribute *attr, char *buf); | |
05516ad8 AK |
58 | extern ssize_t cpu_show_l1tf(struct device *dev, |
59 | struct device_attribute *attr, char *buf); | |
1122cc78 TG |
60 | extern ssize_t cpu_show_mds(struct device *dev, |
61 | struct device_attribute *attr, char *buf); | |
c46d17ac PG |
62 | extern ssize_t cpu_show_tsx_async_abort(struct device *dev, |
63 | struct device_attribute *attr, | |
64 | char *buf); | |
87590ce6 | 65 | |
8db14860 NI |
66 | extern __printf(4, 5) |
67 | struct device *cpu_device_create(struct device *parent, void *drvdata, | |
68 | const struct attribute_group **groups, | |
69 | const char *fmt, ...); | |
1da177e4 | 70 | #ifdef CONFIG_HOTPLUG_CPU |
76b67ed9 | 71 | extern void unregister_cpu(struct cpu *cpu); |
12633e80 NF |
72 | extern ssize_t arch_cpu_probe(const char *, size_t); |
73 | extern ssize_t arch_cpu_release(const char *, size_t); | |
1da177e4 | 74 | #endif |
1da177e4 | 75 | |
f4c09f87 TG |
76 | /* |
77 | * These states are not related to the core CPU hotplug mechanism. They are | |
78 | * used by various (sub)architectures to track internal state | |
80f1ff97 | 79 | */ |
f4c09f87 TG |
80 | #define CPU_ONLINE 0x0002 /* CPU is up */ |
81 | #define CPU_UP_PREPARE 0x0003 /* CPU coming up */ | |
82 | #define CPU_DEAD 0x0007 /* CPU dead */ | |
83 | #define CPU_DEAD_FROZEN 0x0008 /* CPU timed out on unplug */ | |
84 | #define CPU_POST_DEAD 0x0009 /* CPU successfully unplugged */ | |
85 | #define CPU_BROKEN 0x000B /* CPU did not die properly */ | |
80f1ff97 | 86 | |
1da177e4 | 87 | #ifdef CONFIG_SMP |
090e77c3 | 88 | extern bool cpuhp_tasks_frozen; |
1da177e4 | 89 | int cpu_up(unsigned int cpu); |
e545a614 | 90 | void notify_cpu_starting(unsigned int cpu); |
3da1c84c ON |
91 | extern void cpu_maps_update_begin(void); |
92 | extern void cpu_maps_update_done(void); | |
d0d23b54 | 93 | |
3da1c84c | 94 | #else /* CONFIG_SMP */ |
090e77c3 | 95 | #define cpuhp_tasks_frozen 0 |
1da177e4 | 96 | |
3da1c84c ON |
97 | static inline void cpu_maps_update_begin(void) |
98 | { | |
99 | } | |
100 | ||
101 | static inline void cpu_maps_update_done(void) | |
102 | { | |
103 | } | |
104 | ||
1da177e4 | 105 | #endif /* CONFIG_SMP */ |
8a25a2fd | 106 | extern struct bus_type cpu_subsys; |
1da177e4 LT |
107 | |
108 | #ifdef CONFIG_HOTPLUG_CPU | |
8f553c49 TG |
109 | extern void cpus_write_lock(void); |
110 | extern void cpus_write_unlock(void); | |
111 | extern void cpus_read_lock(void); | |
112 | extern void cpus_read_unlock(void); | |
fc8dffd3 | 113 | extern void lockdep_assert_cpus_held(void); |
16e53dbf SB |
114 | extern void cpu_hotplug_disable(void); |
115 | extern void cpu_hotplug_enable(void); | |
cb79295e | 116 | void clear_tasks_mm_cpumask(int cpu); |
1da177e4 | 117 | int cpu_down(unsigned int cpu); |
f7dff2b1 | 118 | |
8f553c49 TG |
119 | #else /* CONFIG_HOTPLUG_CPU */ |
120 | ||
121 | static inline void cpus_write_lock(void) { } | |
122 | static inline void cpus_write_unlock(void) { } | |
123 | static inline void cpus_read_lock(void) { } | |
124 | static inline void cpus_read_unlock(void) { } | |
ade3f680 | 125 | static inline void lockdep_assert_cpus_held(void) { } |
8f553c49 TG |
126 | static inline void cpu_hotplug_disable(void) { } |
127 | static inline void cpu_hotplug_enable(void) { } | |
128 | #endif /* !CONFIG_HOTPLUG_CPU */ | |
129 | ||
130 | /* Wrappers which go away once all code is converted */ | |
131 | static inline void cpu_hotplug_begin(void) { cpus_write_lock(); } | |
132 | static inline void cpu_hotplug_done(void) { cpus_write_unlock(); } | |
133 | static inline void get_online_cpus(void) { cpus_read_lock(); } | |
134 | static inline void put_online_cpus(void) { cpus_read_unlock(); } | |
1da177e4 | 135 | |
f3de4be9 | 136 | #ifdef CONFIG_PM_SLEEP_SMP |
d391e552 JM |
137 | extern int freeze_secondary_cpus(int primary); |
138 | static inline int disable_nonboot_cpus(void) | |
139 | { | |
140 | return freeze_secondary_cpus(0); | |
141 | } | |
e3920fb4 | 142 | extern void enable_nonboot_cpus(void); |
f3de4be9 | 143 | #else /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 RW |
144 | static inline int disable_nonboot_cpus(void) { return 0; } |
145 | static inline void enable_nonboot_cpus(void) {} | |
f3de4be9 | 146 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 | 147 | |
a1a04ec3 | 148 | void cpu_startup_entry(enum cpuhp_state state); |
a1a04ec3 | 149 | |
d1669912 TG |
150 | void cpu_idle_poll_ctrl(bool enable); |
151 | ||
6727ad9e CM |
152 | /* Attach to any functions which should be considered cpuidle. */ |
153 | #define __cpuidle __attribute__((__section__(".cpuidle.text"))) | |
154 | ||
155 | bool cpu_in_idle(unsigned long pc); | |
156 | ||
d1669912 TG |
157 | void arch_cpu_idle(void); |
158 | void arch_cpu_idle_prepare(void); | |
159 | void arch_cpu_idle_enter(void); | |
160 | void arch_cpu_idle_exit(void); | |
161 | void arch_cpu_idle_dead(void); | |
162 | ||
8038dad7 PM |
163 | int cpu_report_state(int cpu); |
164 | int cpu_check_up_prepare(int cpu); | |
165 | void cpu_set_state_online(int cpu); | |
c1de45ca PZ |
166 | void play_idle(unsigned long duration_ms); |
167 | ||
8038dad7 PM |
168 | #ifdef CONFIG_HOTPLUG_CPU |
169 | bool cpu_wait_death(unsigned int cpu, int seconds); | |
170 | bool cpu_report_death(void); | |
e69aab13 TG |
171 | void cpuhp_report_idle_dead(void); |
172 | #else | |
173 | static inline void cpuhp_report_idle_dead(void) { } | |
8038dad7 PM |
174 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
175 | ||
47b4c679 TG |
176 | enum cpuhp_smt_control { |
177 | CPU_SMT_ENABLED, | |
178 | CPU_SMT_DISABLED, | |
179 | CPU_SMT_FORCE_DISABLED, | |
180 | CPU_SMT_NOT_SUPPORTED, | |
181 | }; | |
182 | ||
183 | #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT) | |
184 | extern enum cpuhp_smt_control cpu_smt_control; | |
44219799 | 185 | extern void cpu_smt_disable(bool force); |
483ec3c6 | 186 | extern void cpu_smt_check_topology(void); |
3e14fdad JK |
187 | extern int cpuhp_smt_enable(void); |
188 | extern int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval); | |
47b4c679 TG |
189 | #else |
190 | # define cpu_smt_control (CPU_SMT_ENABLED) | |
44219799 | 191 | static inline void cpu_smt_disable(bool force) { } |
483ec3c6 | 192 | static inline void cpu_smt_check_topology(void) { } |
3e14fdad JK |
193 | static inline int cpuhp_smt_enable(void) { return 0; } |
194 | static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; } | |
47b4c679 TG |
195 | #endif |
196 | ||
658dad68 JP |
197 | /* |
198 | * These are used for a global "mitigations=" cmdline option for toggling | |
199 | * optional CPU mitigations. | |
200 | */ | |
201 | enum cpu_mitigations { | |
202 | CPU_MITIGATIONS_OFF, | |
203 | CPU_MITIGATIONS_AUTO, | |
204 | CPU_MITIGATIONS_AUTO_NOSMT, | |
205 | }; | |
206 | ||
207 | extern enum cpu_mitigations cpu_mitigations; | |
208 | ||
209 | /* mitigations=off */ | |
210 | static inline bool cpu_mitigations_off(void) | |
211 | { | |
212 | return cpu_mitigations == CPU_MITIGATIONS_OFF; | |
213 | } | |
214 | ||
215 | /* mitigations=auto,nosmt */ | |
216 | static inline bool cpu_mitigations_auto_nosmt(void) | |
217 | { | |
218 | return cpu_mitigations == CPU_MITIGATIONS_AUTO_NOSMT; | |
219 | } | |
220 | ||
1da177e4 | 221 | #endif /* _LINUX_CPU_H_ */ |