1#ifndef _ASM_POWERPC_CPUTHREADS_H 2#define _ASM_POWERPC_CPUTHREADS_H 3 4#include <linux/cpumask.h> 5 6/* 7 * Mapping of threads to cores 8 * 9 * Note: This implementation is limited to a power of 2 number of 10 * threads per core and the same number for each core in the system 11 * (though it would work if some processors had less threads as long 12 * as the CPU numbers are still allocated, just not brought offline). 13 * 14 * However, the API allows for a different implementation in the future 15 * if needed, as long as you only use the functions and not the variables 16 * directly. 17 */ 18 19#ifdef CONFIG_SMP 20extern int threads_per_core; 21extern int threads_shift; 22extern cpumask_t threads_core_mask; 23#else 24#define threads_per_core 1 25#define threads_shift 0 26#define threads_core_mask (CPU_MASK_CPU0) 27#endif 28 29/* cpu_thread_mask_to_cores - Return a cpumask of one per cores 30 * hit by the argument 31 * 32 * @threads: a cpumask of threads 33 * 34 * This function returns a cpumask which will have one "cpu" (or thread) 35 * bit set for each core that has at least one thread set in the argument. 36 * 37 * This can typically be used for things like IPI for tlb invalidations 38 * since those need to be done only once per core/TLB 39 */ 40static inline cpumask_t cpu_thread_mask_to_cores(cpumask_t threads) 41{ 42 cpumask_t tmp, res; 43 int i; 44 45 res = CPU_MASK_NONE; 46 for (i = 0; i < NR_CPUS; i += threads_per_core) { 47 cpus_shift_left(tmp, threads_core_mask, i); 48 if (cpus_intersects(threads, tmp)) 49 cpu_set(i, res); 50 } 51 return res; 52} 53 54static inline int cpu_nr_cores(void) 55{ 56 return NR_CPUS >> threads_shift; 57} 58 59static inline cpumask_t cpu_online_cores_map(void) 60{ 61 return cpu_thread_mask_to_cores(cpu_online_map); 62} 63 64static inline int cpu_thread_to_core(int cpu) 65{ 66 return cpu >> threads_shift; 67} 68 69static inline int cpu_thread_in_core(int cpu) 70{ 71 return cpu & (threads_per_core - 1); 72} 73 74static inline int cpu_first_thread_in_core(int cpu) 75{ 76 return cpu & ~(threads_per_core - 1); 77} 78 79static inline int cpu_last_thread_in_core(int cpu) 80{ 81 return cpu | (threads_per_core - 1); 82} 83 84 85 86#endif /* _ASM_POWERPC_CPUTHREADS_H */ 87