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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
8 */
9
10#ifdef CONFIG_SMP
11extern int threads_per_core;
12extern int threads_shift;
13extern 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 */
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_right(tmp, threads_core_mask, i);
39 if (cpus_intersects(threads, tmp))
40 cpu_set(i, res);
41 }
42 return res;
43}
44
45static inline int cpu_nr_cores(void)
46{
47 return NR_CPUS >> threads_shift;
48}
49
50static inline cpumask_t cpu_online_cores_map(void)
51{
52 return cpu_thread_mask_to_cores(cpu_online_map);
53}
54
55static inline int cpu_thread_to_core(int cpu)
56{
57 return cpu >> threads_shift;
58}
59
60static inline int cpu_thread_in_core(int cpu)
61{
62 return cpu & (threads_per_core - 1);
63}
64
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