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Benjamin Herrenschmidt8d089082007-10-25 15:27:44 +10001#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
Benjamin Herrenschmidtfcce8102009-07-23 23:15:10 +00008 *
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.
Benjamin Herrenschmidt8d089082007-10-25 15:27:44 +100017 */
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) {
Benjamin Herrenschmidt6a2d3222008-02-22 14:26:43 +110047 cpus_shift_left(tmp, threads_core_mask, i);
Benjamin Herrenschmidt8d089082007-10-25 15:27:44 +100048 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
Benjamin Herrenschmidtfcce8102009-07-23 23:15:10 +000079static inline int cpu_last_thread_in_core(int cpu)
80{
81 return cpu | (threads_per_core - 1);
82}
83
84
85
Benjamin Herrenschmidt8d089082007-10-25 15:27:44 +100086#endif /* _ASM_POWERPC_CPUTHREADS_H */
87