1 #ifndef _ASM_POWERPC_CPUTHREADS_H
2 #define _ASM_POWERPC_CPUTHREADS_H
4 #include <linux/cpumask.h>
7 * Mapping of threads to cores
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 online).
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
20 extern int threads_per_core;
21 extern int threads_per_subcore;
22 extern int threads_shift;
23 extern cpumask_t threads_core_mask;
25 #define threads_per_core 1
26 #define threads_per_subcore 1
27 #define threads_shift 0
28 #define threads_core_mask (*get_cpu_mask(0))
31 /* cpu_thread_mask_to_cores - Return a cpumask of one per cores
34 * @threads: a cpumask of threads
36 * This function returns a cpumask which will have one "cpu" (or thread)
37 * bit set for each core that has at least one thread set in the argument.
39 * This can typically be used for things like IPI for tlb invalidations
40 * since those need to be done only once per core/TLB
42 static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
48 for (i = 0; i < NR_CPUS; i += threads_per_core) {
49 cpumask_shift_left(&tmp, &threads_core_mask, i);
50 if (cpumask_intersects(threads, &tmp))
51 cpumask_set_cpu(i, &res);
56 static inline int cpu_nr_cores(void)
58 return nr_cpu_ids >> threads_shift;
61 static inline cpumask_t cpu_online_cores_map(void)
63 return cpu_thread_mask_to_cores(cpu_online_mask);
67 int cpu_core_index_of_thread(int cpu);
68 int cpu_first_thread_of_core(int core);
70 static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
71 static inline int cpu_first_thread_of_core(int core) { return core; }
74 static inline int cpu_thread_in_core(int cpu)
76 return cpu & (threads_per_core - 1);
79 static inline int cpu_thread_in_subcore(int cpu)
81 return cpu & (threads_per_subcore - 1);
84 static inline int cpu_first_thread_sibling(int cpu)
86 return cpu & ~(threads_per_core - 1);
89 static inline int cpu_last_thread_sibling(int cpu)
91 return cpu | (threads_per_core - 1);
96 #endif /* _ASM_POWERPC_CPUTHREADS_H */