1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_CPU_SMT_H_
3 #define _LINUX_CPU_SMT_H_
4
5 enum cpuhp_smt_control {
6 CPU_SMT_ENABLED,
7 CPU_SMT_DISABLED,
8 CPU_SMT_FORCE_DISABLED,
9 CPU_SMT_NOT_SUPPORTED,
10 CPU_SMT_NOT_IMPLEMENTED,
11 };
12
13 #if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT)
14 extern enum cpuhp_smt_control cpu_smt_control;
15 extern unsigned int cpu_smt_num_threads;
16 extern void cpu_smt_disable(bool force);
17 extern void cpu_smt_set_num_threads(unsigned int num_threads,
18 unsigned int max_threads);
19 extern bool cpu_smt_possible(void);
20 extern int cpuhp_smt_enable(void);
21 extern int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval);
22 #else
23 # define cpu_smt_control (CPU_SMT_NOT_IMPLEMENTED)
24 # define cpu_smt_num_threads 1
25 static inline void cpu_smt_disable(bool force) { }
26 static inline void cpu_smt_set_num_threads(unsigned int num_threads,
27 unsigned int max_threads) { }
28 static inline bool cpu_smt_possible(void) { return false; }
29 static inline int cpuhp_smt_enable(void) { return 0; }
30 static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; }
31 #endif
32
33 #endif /* _LINUX_CPU_SMT_H_ */
34
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