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 static inline int cpu_nr_cores(void)
36 {
37 return nr_cpu_ids >> threads_shift;
38 }
39
40 #ifdef CONFIG_SMP
41 int cpu_core_index_of_thread(int cpu);
42 int cpu_first_thread_of_core(int core);
43 #else
44 static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
45 static inline int cpu_first_thread_of_core(int core) { return core; }
46 #endif
47
48 static inline int cpu_thread_in_core(int cpu)
49 {
50 return cpu & (threads_per_core - 1);
51 }
52
53 static inline int cpu_thread_in_subcore(int cpu)
54 {
55 return cpu & (threads_per_subcore - 1);
56 }
57
58 static inline int cpu_first_thread_sibling(int cpu)
59 {
60 return cpu & ~(threads_per_core - 1);
61 }
62
63 static inline int cpu_last_thread_sibling(int cpu)
64 {
65 return cpu | (threads_per_core - 1);
66 }
67
68 /*
69 * tlb_thread_siblings are siblings which share a TLB. This is not
70 * architected, is not something a hypervisor could emulate and a future
71 * CPU may change behaviour even in compat mode, so this should only be
72 * used on PowerNV, and only with care.
73 */
74 static inline int cpu_first_tlb_thread_sibling(int cpu)
75 {
76 if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
77 return cpu & ~0x6; /* Big Core */
78 else
79 return cpu_first_thread_sibling(cpu);
80 }
81
82 static inline int cpu_last_tlb_thread_sibling(int cpu)
83 {
84 if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
85 return cpu | 0x6; /* Big Core */
86 else
87 return cpu_last_thread_sibling(cpu);
88 }
89
90 static inline int cpu_tlb_thread_sibling_step(void)
91 {
92 if (cpu_has_feature(CPU_FTR_ARCH_300) && (threads_per_core == 8))
93 return 2; /* Big Core */
94 else
95 return 1;
96 }
97
98 static inline u32 get_tensr(void)
99 {
100 #ifdef CONFIG_BOOKE
101 if (cpu_has_feature(CPU_FTR_SMT))
102 return mfspr(SPRN_TENSR);
103 #endif
104 return 1;
105 }
106
107 void book3e_start_thread(int thread, unsigned long addr);
108 void book3e_stop_thread(int thread);
109
110 #endif /* __ASSEMBLY__ */
111
112 #define INVALID_THREAD_HWID 0x0fff
113
114 #endif /* _ASM_POWERPC_CPUTHREADS_H */
115
116
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