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