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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 | |
933b90a9 | 12 | * as the CPU numbers are still allocated, just not brought online). |
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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 | */ | |
104699c0 | 40 | static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads) |
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41 | { |
42 | cpumask_t tmp, res; | |
43 | int i; | |
44 | ||
104699c0 | 45 | cpumask_clear(&res); |
8d089085 | 46 | for (i = 0; i < NR_CPUS; i += threads_per_core) { |
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47 | cpumask_shift_left(&tmp, &threads_core_mask, i); |
48 | if (cpumask_intersects(threads, &tmp)) | |
49 | cpumask_set_cpu(i, &res); | |
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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 | { | |
104699c0 | 61 | return cpu_thread_mask_to_cores(cpu_online_mask); |
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62 | } |
63 | ||
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64 | #ifdef CONFIG_SMP |
65 | int cpu_core_index_of_thread(int cpu); | |
66 | int cpu_first_thread_of_core(int core); | |
67 | #else | |
68 | static inline int cpu_core_index_of_thread(int cpu) { return cpu; } | |
69 | static inline int cpu_first_thread_of_core(int core) { return core; } | |
70 | #endif | |
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71 | |
72 | static inline int cpu_thread_in_core(int cpu) | |
73 | { | |
74 | return cpu & (threads_per_core - 1); | |
75 | } | |
76 | ||
99d86705 | 77 | static inline int cpu_first_thread_sibling(int cpu) |
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78 | { |
79 | return cpu & ~(threads_per_core - 1); | |
80 | } | |
81 | ||
99d86705 | 82 | static inline int cpu_last_thread_sibling(int cpu) |
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83 | { |
84 | return cpu | (threads_per_core - 1); | |
85 | } | |
86 | ||
87 | ||
88 | ||
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89 | #endif /* _ASM_POWERPC_CPUTHREADS_H */ |
90 |