include/linux/cpu_smt.h

   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_ */