arch/mips/kernel/cacheinfo.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * MIPS cacheinfo support
   4  */
   5 #include <linux/cacheinfo.h>
   6
   7 /* Populates leaf and increments to next leaf */
   8 #define populate_cache(cache, leaf, c_level, c_type)            \
   9 do {                                                            \
  10         leaf->type = c_type;                                    \
  11         leaf->level = c_level;                                  \
  12         leaf->coherency_line_size = c->cache.linesz;            \
  13         leaf->number_of_sets = c->cache.sets;                   \
  14         leaf->ways_of_associativity = c->cache.ways;            \
  15         leaf->size = c->cache.linesz * c->cache.sets *          \
  16                 c->cache.ways;                                  \
  17         leaf++;                                                 \
  18 } while (0)
  19
  20 int init_cache_level(unsigned int cpu)
  21 {
  22         struct cpuinfo_mips *c = &current_cpu_data;
  23         struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
  24         int levels = 0, leaves = 0;
  25
  26         /*
  27          * If Dcache is not set, we assume the cache structures
  28          * are not properly initialized.
  29          */
  30         if (c->dcache.waysize)
  31                 levels += 1;
  32         else
  33                 return -ENOENT;
  34
  35
  36         leaves += (c->icache.waysize) ? 2 : 1;
  37
  38         if (c->vcache.waysize) {
  39                 levels++;
  40                 leaves++;
  41         }
  42
  43         if (c->scache.waysize) {
  44                 levels++;
  45                 leaves++;
  46         }
  47
  48         if (c->tcache.waysize) {
  49                 levels++;
  50                 leaves++;
  51         }
  52
  53         this_cpu_ci->num_levels = levels;
  54         this_cpu_ci->num_leaves = leaves;
  55         return 0;
  56 }
  57
  58 static void fill_cpumask_siblings(int cpu, cpumask_t *cpu_map)
  59 {
  60         int cpu1;
  61
  62         for_each_possible_cpu(cpu1)
  63                 if (cpus_are_siblings(cpu, cpu1))
  64                         cpumask_set_cpu(cpu1, cpu_map);
  65 }
  66
  67 static void fill_cpumask_cluster(int cpu, cpumask_t *cpu_map)
  68 {
  69         int cpu1;
  70         int cluster = cpu_cluster(&cpu_data[cpu]);
  71
  72         for_each_possible_cpu(cpu1)
  73                 if (cpu_cluster(&cpu_data[cpu1]) == cluster)
  74                         cpumask_set_cpu(cpu1, cpu_map);
  75 }
  76
  77 int populate_cache_leaves(unsigned int cpu)
  78 {
  79         struct cpuinfo_mips *c = &current_cpu_data;
  80         struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
  81         struct cacheinfo *this_leaf = this_cpu_ci->info_list;
  82         int level = 1;
  83
  84         if (c->icache.waysize) {
  85                 /* I/D caches are per core */
  86                 fill_cpumask_siblings(cpu, &this_leaf->shared_cpu_map);
  87                 populate_cache(dcache, this_leaf, level, CACHE_TYPE_DATA);
  88                 fill_cpumask_siblings(cpu, &this_leaf->shared_cpu_map);
  89                 populate_cache(icache, this_leaf, level, CACHE_TYPE_INST);
  90                 level++;
  91         } else {
  92                 populate_cache(dcache, this_leaf, level, CACHE_TYPE_UNIFIED);
  93                 level++;
  94         }
  95
  96         if (c->vcache.waysize) {
  97                 /* Vcache is per core as well */
  98                 fill_cpumask_siblings(cpu, &this_leaf->shared_cpu_map);
  99                 populate_cache(vcache, this_leaf, level, CACHE_TYPE_UNIFIED);
 100                 level++;
 101         }
 102
 103         if (c->scache.waysize) {
 104                 /* Scache is per cluster */
 105                 fill_cpumask_cluster(cpu, &this_leaf->shared_cpu_map);
 106                 populate_cache(scache, this_leaf, level, CACHE_TYPE_UNIFIED);
 107                 level++;
 108         }
 109
 110         if (c->tcache.waysize)
 111                 populate_cache(tcache, this_leaf, level, CACHE_TYPE_UNIFIED);
 112
 113         this_cpu_ci->cpu_map_populated = true;
 114
 115         return 0;
 116 }