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Linux/arch/mips/kernel/cacheinfo.c

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  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 static 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->scache.waysize) {
 39                 levels++;
 40                 leaves++;
 41         }
 42 
 43         if (c->tcache.waysize) {
 44                 levels++;
 45                 leaves++;
 46         }
 47 
 48         this_cpu_ci->num_levels = levels;
 49         this_cpu_ci->num_leaves = leaves;
 50         return 0;
 51 }
 52 
 53 static void fill_cpumask_siblings(int cpu, cpumask_t *cpu_map)
 54 {
 55         int cpu1;
 56 
 57         for_each_possible_cpu(cpu1)
 58                 if (cpus_are_siblings(cpu, cpu1))
 59                         cpumask_set_cpu(cpu1, cpu_map);
 60 }
 61 
 62 static void fill_cpumask_cluster(int cpu, cpumask_t *cpu_map)
 63 {
 64         int cpu1;
 65         int cluster = cpu_cluster(&cpu_data[cpu]);
 66 
 67         for_each_possible_cpu(cpu1)
 68                 if (cpu_cluster(&cpu_data[cpu1]) == cluster)
 69                         cpumask_set_cpu(cpu1, cpu_map);
 70 }
 71 
 72 static int __populate_cache_leaves(unsigned int cpu)
 73 {
 74         struct cpuinfo_mips *c = &current_cpu_data;
 75         struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
 76         struct cacheinfo *this_leaf = this_cpu_ci->info_list;
 77 
 78         if (c->icache.waysize) {
 79                 /* L1 caches are per core */
 80                 fill_cpumask_siblings(cpu, &this_leaf->shared_cpu_map);
 81                 populate_cache(dcache, this_leaf, 1, CACHE_TYPE_DATA);
 82                 fill_cpumask_siblings(cpu, &this_leaf->shared_cpu_map);
 83                 populate_cache(icache, this_leaf, 1, CACHE_TYPE_INST);
 84         } else {
 85                 populate_cache(dcache, this_leaf, 1, CACHE_TYPE_UNIFIED);
 86         }
 87 
 88         if (c->scache.waysize) {
 89                 /* L2 cache is per cluster */
 90                 fill_cpumask_cluster(cpu, &this_leaf->shared_cpu_map);
 91                 populate_cache(scache, this_leaf, 2, CACHE_TYPE_UNIFIED);
 92         }
 93 
 94         if (c->tcache.waysize)
 95                 populate_cache(tcache, this_leaf, 3, CACHE_TYPE_UNIFIED);
 96 
 97         this_cpu_ci->cpu_map_populated = true;
 98 
 99         return 0;
100 }
101 
102 DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level)
103 DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves)
104 

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