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
23 extern int threads_per_core;
24 extern int threads_per_subcore;
25 extern int threads_shift;
26 extern 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 */
cpu_thread_mask_to_cores(const struct cpumask * threads)46 static 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
cpu_nr_cores(void)63 static inline int cpu_nr_cores(void)
64 {
65 return nr_cpu_ids >> threads_shift;
66 }
67
cpu_online_cores_map(void)68 static 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
74 int cpu_core_index_of_thread(int cpu);
75 int cpu_first_thread_of_core(int core);
76 #else
cpu_core_index_of_thread(int cpu)77 static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
cpu_first_thread_of_core(int core)78 static inline int cpu_first_thread_of_core(int core) { return core; }
79 #endif
80
cpu_thread_in_core(int cpu)81 static inline int cpu_thread_in_core(int cpu)
82 {
83 return cpu & (threads_per_core - 1);
84 }
85
cpu_thread_in_subcore(int cpu)86 static inline int cpu_thread_in_subcore(int cpu)
87 {
88 return cpu & (threads_per_subcore - 1);
89 }
90
cpu_first_thread_sibling(int cpu)91 static inline int cpu_first_thread_sibling(int cpu)
92 {
93 return cpu & ~(threads_per_core - 1);
94 }
95
cpu_last_thread_sibling(int cpu)96 static inline int cpu_last_thread_sibling(int cpu)
97 {
98 return cpu | (threads_per_core - 1);
99 }
100
get_tensr(void)101 static 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
110 void book3e_start_thread(int thread, unsigned long addr);
111 void book3e_stop_thread(int thread);
112
113 #endif /* __ASSEMBLY__ */
114
115 #define INVALID_THREAD_HWID 0x0fff
116
117 #endif /* _ASM_POWERPC_CPUTHREADS_H */
118
119
