tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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 bool has_big_cores;
27extern cpumask_t threads_core_mask;
28#else
29#define threads_per_core 1
30#define threads_per_subcore 1
31#define threads_shift 0
32#define has_big_cores 0
33#define threads_core_mask (*get_cpu_mask(0))
34#endif
35
36/* cpu_thread_mask_to_cores - Return a cpumask of one per cores
37 * hit by the argument
38 *
39 * @threads: a cpumask of online threads
40 *
41 * This function returns a cpumask which will have one online cpu's
42 * bit set for each core that has at least one thread set in the argument.
43 *
44 * This can typically be used for things like IPI for tlb invalidations
45 * since those need to be done only once per core/TLB
46 */
47static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
48{
49 cpumask_t tmp, res;
50 int i, cpu;
51
52 cpumask_clear(&res);
53 for (i = 0; i < NR_CPUS; i += threads_per_core) {
54 cpumask_shift_left(&tmp, &threads_core_mask, i);
55 if (cpumask_intersects(threads, &tmp)) {
56 cpu = cpumask_next_and(-1, &tmp, cpu_online_mask);
57 if (cpu < nr_cpu_ids)
58 cpumask_set_cpu(cpu, &res);
59 }
60 }
61 return res;
62}
63
64static inline int cpu_nr_cores(void)
65{
66 return nr_cpu_ids >> threads_shift;
67}
68
69static inline cpumask_t cpu_online_cores_map(void)
70{
71 return cpu_thread_mask_to_cores(cpu_online_mask);
72}
73
74#ifdef CONFIG_SMP
75int cpu_core_index_of_thread(int cpu);
76int cpu_first_thread_of_core(int core);
77#else
78static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
79static inline int cpu_first_thread_of_core(int core) { return core; }
80#endif
81
82static inline int cpu_thread_in_core(int cpu)
83{
84 return cpu & (threads_per_core - 1);
85}
86
87static inline int cpu_thread_in_subcore(int cpu)
88{
89 return cpu & (threads_per_subcore - 1);
90}
91
92static inline int cpu_first_thread_sibling(int cpu)
93{
94 return cpu & ~(threads_per_core - 1);
95}
96
97static inline int cpu_last_thread_sibling(int cpu)
98{
99 return cpu | (threads_per_core - 1);
100}
101
102static inline u32 get_tensr(void)
103{
104#ifdef CONFIG_BOOKE
105 if (cpu_has_feature(CPU_FTR_SMT))
106 return mfspr(SPRN_TENSR);
107#endif
108 return 1;
109}
110
111void book3e_start_thread(int thread, unsigned long addr);
112void book3e_stop_thread(int thread);
113
114#endif /* __ASSEMBLY__ */
115
116#define INVALID_THREAD_HWID 0x0fff
117
118#endif /* _ASM_POWERPC_CPUTHREADS_H */
119