1 #ifndef _ASM_POWERPC_CPUTHREADS_H
2 #define _ASM_POWERPC_CPUTHREADS_H
3 
4 #ifndef __ASSEMBLY__
5 #include <linux/cpumask.h>
6 #include <asm/cpu_has_feature.h>
7 
8 /*
9  * Mapping of threads to cores
10  *
11  * Note: This implementation is limited to a power of 2 number of
12  * threads per core and the same number for each core in the system
13  * (though it would work if some processors had less threads as long
14  * as the CPU numbers are still allocated, just not brought online).
15  *
16  * However, the API allows for a different implementation in the future
17  * if needed, as long as you only use the functions and not the variables
18  * directly.
19  */
20 
21 #ifdef CONFIG_SMP
22 extern int threads_per_core;
23 extern int threads_per_subcore;
24 extern int threads_shift;
25 extern cpumask_t threads_core_mask;
26 #else
27 #define threads_per_core	1
28 #define threads_per_subcore	1
29 #define threads_shift		0
30 #define threads_core_mask	(*get_cpu_mask(0))
31 #endif
32 
33 /* cpu_thread_mask_to_cores - Return a cpumask of one per cores
34  *                            hit by the argument
35  *
36  * @threads:	a cpumask of online threads
37  *
38  * This function returns a cpumask which will have one online cpu's
39  * bit set for each core that has at least one thread set in the argument.
40  *
41  * This can typically be used for things like IPI for tlb invalidations
42  * since those need to be done only once per core/TLB
43  */
44 static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
45 {
46 	cpumask_t	tmp, res;
47 	int		i, cpu;
48 
49 	cpumask_clear(&res);
50 	for (i = 0; i < NR_CPUS; i += threads_per_core) {
51 		cpumask_shift_left(&tmp, &threads_core_mask, i);
52 		if (cpumask_intersects(threads, &tmp)) {
53 			cpu = cpumask_next_and(-1, &tmp, cpu_online_mask);
54 			if (cpu < nr_cpu_ids)
55 				cpumask_set_cpu(cpu, &res);
56 		}
57 	}
58 	return res;
59 }
60 
61 static inline int cpu_nr_cores(void)
62 {
63 	return nr_cpu_ids >> threads_shift;
64 }
65 
66 static inline cpumask_t cpu_online_cores_map(void)
67 {
68 	return cpu_thread_mask_to_cores(cpu_online_mask);
69 }
70 
71 #ifdef CONFIG_SMP
72 int cpu_core_index_of_thread(int cpu);
73 int cpu_first_thread_of_core(int core);
74 #else
75 static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
76 static inline int cpu_first_thread_of_core(int core) { return core; }
77 #endif
78 
79 static inline int cpu_thread_in_core(int cpu)
80 {
81 	return cpu & (threads_per_core - 1);
82 }
83 
84 static inline int cpu_thread_in_subcore(int cpu)
85 {
86 	return cpu & (threads_per_subcore - 1);
87 }
88 
89 static inline int cpu_first_thread_sibling(int cpu)
90 {
91 	return cpu & ~(threads_per_core - 1);
92 }
93 
94 static inline int cpu_last_thread_sibling(int cpu)
95 {
96 	return cpu | (threads_per_core - 1);
97 }
98 
99 static inline u32 get_tensr(void)
100 {
101 #ifdef	CONFIG_BOOKE
102 	if (cpu_has_feature(CPU_FTR_SMT))
103 		return mfspr(SPRN_TENSR);
104 #endif
105 	return 1;
106 }
107 
108 void book3e_start_thread(int thread, unsigned long addr);
109 void book3e_stop_thread(int thread);
110 
111 #endif /* __ASSEMBLY__ */
112 
113 #define INVALID_THREAD_HWID	0x0fff
114 
115 #endif /* _ASM_POWERPC_CPUTHREADS_H */
116 
117