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Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_POWERPC_CPUTHREADS_H
3#define _ASM_POWERPC_CPUTHREADS_H
4
5#ifndef __ASSEMBLY__
6#include <linux/cpumask.h>
7#include <asm/cpu_has_feature.h>
8
9/*
10 * Mapping of threads to cores
11 *
12 * Note: This implementation is limited to a power of 2 number of
13 * threads per core and the same number for each core in the system
14 * (though it would work if some processors had less threads as long
15 * as the CPU numbers are still allocated, just not brought online).
16 *
17 * However, the API allows for a different implementation in the future
18 * if needed, as long as you only use the functions and not the variables
19 * directly.
20 */
21
22#ifdef CONFIG_SMP
23extern int threads_per_core;
24extern int threads_per_subcore;
25extern int threads_shift;
26extern cpumask_t threads_core_mask;
27#else
28#define threads_per_core 1
29#define threads_per_subcore 1
30#define threads_shift 0
31#define has_big_cores 0
32#define threads_core_mask (*get_cpu_mask(0))
33#endif
34
35/* cpu_thread_mask_to_cores - Return a cpumask of one per cores
36 * hit by the argument
37 *
38 * @threads: a cpumask of online threads
39 *
40 * This function returns a cpumask which will have one online cpu's
41 * bit set for each core that has at least one thread set in the argument.
42 *
43 * This can typically be used for things like IPI for tlb invalidations
44 * since those need to be done only once per core/TLB
45 */
46static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
47{
48 cpumask_t tmp, res;
49 int i, cpu;
50
51 cpumask_clear(&res);
52 for (i = 0; i < NR_CPUS; i += threads_per_core) {
53 cpumask_shift_left(&tmp, &threads_core_mask, i);
54 if (cpumask_intersects(threads, &tmp)) {
55 cpu = cpumask_next_and(-1, &tmp, cpu_online_mask);
56 if (cpu < nr_cpu_ids)
57 cpumask_set_cpu(cpu, &res);
58 }
59 }
60 return res;
61}
62
63static inline int cpu_nr_cores(void)
64{
65 return nr_cpu_ids >> threads_shift;
66}
67
68static inline cpumask_t cpu_online_cores_map(void)
69{
70 return cpu_thread_mask_to_cores(cpu_online_mask);
71}
72
73#ifdef CONFIG_SMP
74int cpu_core_index_of_thread(int cpu);
75int cpu_first_thread_of_core(int core);
76#else
77static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
78static inline int cpu_first_thread_of_core(int core) { return core; }
79#endif
80
81static inline int cpu_thread_in_core(int cpu)
82{
83 return cpu & (threads_per_core - 1);
84}
85
86static inline int cpu_thread_in_subcore(int cpu)
87{
88 return cpu & (threads_per_subcore - 1);
89}
90
91static inline int cpu_first_thread_sibling(int cpu)
92{
93 return cpu & ~(threads_per_core - 1);
94}
95
96static inline int cpu_last_thread_sibling(int cpu)
97{
98 return cpu | (threads_per_core - 1);
99}
100
101static inline u32 get_tensr(void)
102{
103#ifdef CONFIG_BOOKE
104 if (cpu_has_feature(CPU_FTR_SMT))
105 return mfspr(SPRN_TENSR);
106#endif
107 return 1;
108}
109
110void book3e_start_thread(int thread, unsigned long addr);
111void book3e_stop_thread(int thread);
112
113#endif /* __ASSEMBLY__ */
114
115#define INVALID_THREAD_HWID 0x0fff
116
117#endif /* _ASM_POWERPC_CPUTHREADS_H */
118