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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 | |
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8 | * |
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. | |
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17 | */ |
18 | ||
19 | #ifdef CONFIG_SMP | |
20 | extern int threads_per_core; | |
21 | extern int threads_shift; | |
22 | extern 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 | */ | |
40 | static 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) { | |
6a2d322e | 47 | cpus_shift_left(tmp, threads_core_mask, i); |
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48 | if (cpus_intersects(threads, tmp)) |
49 | cpu_set(i, res); | |
50 | } | |
51 | return res; | |
52 | } | |
53 | ||
54 | static inline int cpu_nr_cores(void) | |
55 | { | |
56 | return NR_CPUS >> threads_shift; | |
57 | } | |
58 | ||
59 | static inline cpumask_t cpu_online_cores_map(void) | |
60 | { | |
61 | return cpu_thread_mask_to_cores(cpu_online_map); | |
62 | } | |
63 | ||
64 | static inline int cpu_thread_to_core(int cpu) | |
65 | { | |
66 | return cpu >> threads_shift; | |
67 | } | |
68 | ||
69 | static inline int cpu_thread_in_core(int cpu) | |
70 | { | |
71 | return cpu & (threads_per_core - 1); | |
72 | } | |
73 | ||
74 | static inline int cpu_first_thread_in_core(int cpu) | |
75 | { | |
76 | return cpu & ~(threads_per_core - 1); | |
77 | } | |
78 | ||
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79 | static inline int cpu_last_thread_in_core(int cpu) |
80 | { | |
81 | return cpu | (threads_per_core - 1); | |
82 | } | |
83 | ||
84 | ||
85 | ||
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86 | #endif /* _ASM_POWERPC_CPUTHREADS_H */ |
87 |