1 #ifndef _ASM_POWERPC_CPUTHREADS_H
2 #define _ASM_POWERPC_CPUTHREADS_H
5 #include <linux/cpumask.h>
8 * Mapping of threads to cores
10 * Note: This implementation is limited to a power of 2 number of
11 * threads per core and the same number for each core in the system
12 * (though it would work if some processors had less threads as long
13 * as the CPU numbers are still allocated, just not brought online).
15 * However, the API allows for a different implementation in the future
16 * if needed, as long as you only use the functions and not the variables
21 extern int threads_per_core;
22 extern int threads_per_subcore;
23 extern int threads_shift;
24 extern cpumask_t threads_core_mask;
26 #define threads_per_core 1
27 #define threads_per_subcore 1
28 #define threads_shift 0
29 #define threads_core_mask (*get_cpu_mask(0))
32 /* cpu_thread_mask_to_cores - Return a cpumask of one per cores
35 * @threads: a cpumask of online threads
37 * This function returns a cpumask which will have one online cpu's
38 * bit set for each core that has at least one thread set in the argument.
40 * This can typically be used for things like IPI for tlb invalidations
41 * since those need to be done only once per core/TLB
43 static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
49 for (i = 0; i < NR_CPUS; i += threads_per_core) {
50 cpumask_shift_left(&tmp, &threads_core_mask, i);
51 if (cpumask_intersects(threads, &tmp)) {
52 cpu = cpumask_next_and(-1, &tmp, cpu_online_mask);
54 cpumask_set_cpu(cpu, &res);
60 static inline int cpu_nr_cores(void)
62 return nr_cpu_ids >> threads_shift;
65 static inline cpumask_t cpu_online_cores_map(void)
67 return cpu_thread_mask_to_cores(cpu_online_mask);
71 int cpu_core_index_of_thread(int cpu);
72 int cpu_first_thread_of_core(int core);
74 static inline int cpu_core_index_of_thread(int cpu) { return cpu; }
75 static inline int cpu_first_thread_of_core(int core) { return core; }
78 static inline int cpu_thread_in_core(int cpu)
80 return cpu & (threads_per_core - 1);
83 static inline int cpu_thread_in_subcore(int cpu)
85 return cpu & (threads_per_subcore - 1);
88 static inline int cpu_first_thread_sibling(int cpu)
90 return cpu & ~(threads_per_core - 1);
93 static inline int cpu_last_thread_sibling(int cpu)
95 return cpu | (threads_per_core - 1);
98 static inline u32 get_tensr(void)
101 if (cpu_has_feature(CPU_FTR_SMT))
102 return mfspr(SPRN_TENSR);
107 void book3e_start_thread(int thread, unsigned long addr);
108 void book3e_stop_thread(int thread);
110 #endif /* __ASSEMBLY__ */
112 #define INVALID_THREAD_HWID 0x0fff
114 #endif /* _ASM_POWERPC_CPUTHREADS_H */