xref: /linux/include/linux/cpu_smt.h (revision a1c613ae4c322ddd58d5a8539dbfba2a0380a8c0)
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
cpu_smt_disable(bool force)25 static inline void cpu_smt_disable(bool force) { }
cpu_smt_set_num_threads(unsigned int num_threads,unsigned int max_threads)26 static inline void cpu_smt_set_num_threads(unsigned int num_threads,
27 					   unsigned int max_threads) { }
cpu_smt_possible(void)28 static inline bool cpu_smt_possible(void) { return false; }
cpuhp_smt_enable(void)29 static inline int cpuhp_smt_enable(void) { return 0; }
cpuhp_smt_disable(enum cpuhp_smt_control ctrlval)30 static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; }
31 #endif
32 
33 #endif /* _LINUX_CPU_SMT_H_ */
34