blob: 4c8ad592ae3351d96f7e225411d9f551657c5bc7 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
#ifndef _ASM_POWERPC_CPUTHREADS_H
#define _ASM_POWERPC_CPUTHREADS_H
#include <linux/cpumask.h>
/*
* Mapping of threads to cores
*
* Note: This implementation is limited to a power of 2 number of
* threads per core and the same number for each core in the system
* (though it would work if some processors had less threads as long
* as the CPU numbers are still allocated, just not brought online).
*
* However, the API allows for a different implementation in the future
* if needed, as long as you only use the functions and not the variables
* directly.
*/
#ifdef CONFIG_SMP
extern int threads_per_core;
extern int threads_per_subcore;
extern int threads_shift;
extern cpumask_t threads_core_mask;
#else
#define threads_per_core 1
#define threads_per_subcore 1
#define threads_shift 0
#define threads_core_mask (CPU_MASK_CPU0)
#endif
/* cpu_thread_mask_to_cores - Return a cpumask of one per cores
* hit by the argument
*
* @threads: a cpumask of threads
*
* This function returns a cpumask which will have one "cpu" (or thread)
* bit set for each core that has at least one thread set in the argument.
*
* This can typically be used for things like IPI for tlb invalidations
* since those need to be done only once per core/TLB
*/
static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
{
cpumask_t tmp, res;
int i;
cpumask_clear(&res);
for (i = 0; i < NR_CPUS; i += threads_per_core) {
cpumask_shift_left(&tmp, &threads_core_mask, i);
if (cpumask_intersects(threads, &tmp))
cpumask_set_cpu(i, &res);
}
return res;
}
static inline int cpu_nr_cores(void)
{
return nr_cpu_ids >> threads_shift;
}
static inline cpumask_t cpu_online_cores_map(void)
{
return cpu_thread_mask_to_cores(cpu_online_mask);
}
#ifdef CONFIG_SMP
int cpu_core_index_of_thread(int cpu);
int cpu_first_thread_of_core(int core);
#else
static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
static inline int cpu_first_thread_of_core(int core) { return core; }
#endif
static inline int cpu_thread_in_core(int cpu)
{
return cpu & (threads_per_core - 1);
}
static inline int cpu_thread_in_subcore(int cpu)
{
return cpu & (threads_per_subcore - 1);
}
static inline int cpu_first_thread_sibling(int cpu)
{
return cpu & ~(threads_per_core - 1);
}
static inline int cpu_last_thread_sibling(int cpu)
{
return cpu | (threads_per_core - 1);
}
#endif /* _ASM_POWERPC_CPUTHREADS_H */
|
