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