arch/powerpc/include/asm/cputhreads.h

   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