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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 | */ | |
31 | static 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 | ||
45 | static inline int cpu_nr_cores(void) | |
46 | { | |
47 | return NR_CPUS >> threads_shift; | |
48 | } | |
49 | ||
50 | static inline cpumask_t cpu_online_cores_map(void) | |
51 | { | |
52 | return cpu_thread_mask_to_cores(cpu_online_map); | |
53 | } | |
54 | ||
55 | static inline int cpu_thread_to_core(int cpu) | |
56 | { | |
57 | return cpu >> threads_shift; | |
58 | } | |
59 | ||
60 | static inline int cpu_thread_in_core(int cpu) | |
61 | { | |
62 | return cpu & (threads_per_core - 1); | |
63 | } | |
64 | ||
65 | static 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 |