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 bool has_big_cores;
27 extern 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 */
cpu_thread_mask_to_cores(const struct cpumask * threads)47 static 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
cpu_nr_cores(void)64 static inline int cpu_nr_cores(void)
65 {
66 return nr_cpu_ids >> threads_shift;
67 }
68
cpu_online_cores_map(void)69 static 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
75 int cpu_core_index_of_thread(int cpu);
76 int cpu_first_thread_of_core(int core);
77 #else
cpu_core_index_of_thread(int cpu)78 static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
cpu_first_thread_of_core(int core)79 static inline int cpu_first_thread_of_core(int core) { return core; }
80 #endif
81
cpu_thread_in_core(int cpu)82 static inline int cpu_thread_in_core(int cpu)
83 {
84 return cpu & (threads_per_core - 1);
85 }
86
cpu_thread_in_subcore(int cpu)87 static inline int cpu_thread_in_subcore(int cpu)
88 {
89 return cpu & (threads_per_subcore - 1);
90 }
91
cpu_first_thread_sibling(int cpu)92 static inline int cpu_first_thread_sibling(int cpu)
93 {
94 return cpu & ~(threads_per_core - 1);
95 }
96
cpu_last_thread_sibling(int cpu)97 static inline int cpu_last_thread_sibling(int cpu)
98 {
99 return cpu | (threads_per_core - 1);
100 }
101
get_tensr(void)102 static 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
111 void book3e_start_thread(int thread, unsigned long addr);
112 void book3e_stop_thread(int thread);
113
114 #endif /* __ASSEMBLY__ */
115
116 #define INVALID_THREAD_HWID 0x0fff
117
118 #endif /* _ASM_POWERPC_CPUTHREADS_H */
119
120
