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 10 #ifdef CONFIG_SMP 11 extern int threads_per_core; 12 extern int threads_shift; 13 extern cpumask_t threads_core_mask; 14 #else 15 #define threads_per_core 1 16 #define threads_shift 0 17 #define threads_core_mask (CPU_MASK_CPU0) 18 #endif 19 20 /* cpu_thread_mask_to_cores - Return a cpumask of one per cores 21 * hit by the argument 22 * 23 * @threads: a cpumask of threads 24 * 25 * This function returns a cpumask which will have one "cpu" (or thread) 26 * bit set for each core that has at least one thread set in the argument. 27 * 28 * This can typically be used for things like IPI for tlb invalidations 29 * since those need to be done only once per core/TLB 30 */ cpu_thread_mask_to_cores(cpumask_t threads)31static inline cpumask_t cpu_thread_mask_to_cores(cpumask_t threads) 32 { 33 cpumask_t tmp, res; 34 int i; 35 36 res = CPU_MASK_NONE; 37 for (i = 0; i < NR_CPUS; i += threads_per_core) { 38 cpus_shift_left(tmp, threads_core_mask, i); 39 if (cpus_intersects(threads, tmp)) 40 cpu_set(i, res); 41 } 42 return res; 43 } 44 cpu_nr_cores(void)45static inline int cpu_nr_cores(void) 46 { 47 return NR_CPUS >> threads_shift; 48 } 49 cpu_online_cores_map(void)50static inline cpumask_t cpu_online_cores_map(void) 51 { 52 return cpu_thread_mask_to_cores(cpu_online_map); 53 } 54 cpu_thread_to_core(int cpu)55static inline int cpu_thread_to_core(int cpu) 56 { 57 return cpu >> threads_shift; 58 } 59 cpu_thread_in_core(int cpu)60static inline int cpu_thread_in_core(int cpu) 61 { 62 return cpu & (threads_per_core - 1); 63 } 64 cpu_first_thread_in_core(int cpu)65static inline int cpu_first_thread_in_core(int cpu) 66 { 67 return cpu & ~(threads_per_core - 1); 68 } 69 70 #endif /* _ASM_POWERPC_CPUTHREADS_H */ 71 72