arch/riscv/kernel/cacheinfo.c

   1 /*
   2  * Copyright (C) 2017 SiFive
   3  *
   4  *   This program is free software; you can redistribute it and/or
   5  *   modify it under the terms of the GNU General Public License
   6  *   as published by the Free Software Foundation, version 2.
   7  *
   8  *   This program is distributed in the hope that it will be useful,
   9  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  *   GNU General Public License for more details.
  12  */
  13
  14 #include <linux/cacheinfo.h>
  15 #include <linux/cpu.h>
  16 #include <linux/of.h>
  17 #include <linux/of_device.h>
  18
  19 static void ci_leaf_init(struct cacheinfo *this_leaf,
  20                          struct device_node *node,
  21                          enum cache_type type, unsigned int level)
  22 {
  23         this_leaf->level = level;
  24         this_leaf->type = type;
  25         /* not a sector cache */
  26         this_leaf->physical_line_partition = 1;
  27         /* TODO: Add to DTS */
  28         this_leaf->attributes =
  29                 CACHE_WRITE_BACK
  30                 | CACHE_READ_ALLOCATE
  31                 | CACHE_WRITE_ALLOCATE;
  32 }
  33
  34 static int __init_cache_level(unsigned int cpu)
  35 {
  36         struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
  37         struct device_node *np = of_cpu_device_node_get(cpu);
  38         int levels = 0, leaves = 0, level;
  39
  40         if (of_property_read_bool(np, "cache-size"))
  41                 ++leaves;
  42         if (of_property_read_bool(np, "i-cache-size"))
  43                 ++leaves;
  44         if (of_property_read_bool(np, "d-cache-size"))
  45                 ++leaves;
  46         if (leaves > 0)
  47                 levels = 1;
  48
  49         while ((np = of_find_next_cache_node(np))) {
  50                 if (!of_device_is_compatible(np, "cache"))
  51                         break;
  52                 if (of_property_read_u32(np, "cache-level", &level))
  53                         break;
  54                 if (level <= levels)
  55                         break;
  56                 if (of_property_read_bool(np, "cache-size"))
  57                         ++leaves;
  58                 if (of_property_read_bool(np, "i-cache-size"))
  59                         ++leaves;
  60                 if (of_property_read_bool(np, "d-cache-size"))
  61                         ++leaves;
  62                 levels = level;
  63         }
  64
  65         this_cpu_ci->num_levels = levels;
  66         this_cpu_ci->num_leaves = leaves;
  67         return 0;
  68 }
  69
  70 static int __populate_cache_leaves(unsigned int cpu)
  71 {
  72         struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
  73         struct cacheinfo *this_leaf = this_cpu_ci->info_list;
  74         struct device_node *np = of_cpu_device_node_get(cpu);
  75         int levels = 1, level = 1;
  76
  77         if (of_property_read_bool(np, "cache-size"))
  78                 ci_leaf_init(this_leaf++, np, CACHE_TYPE_UNIFIED, level);
  79         if (of_property_read_bool(np, "i-cache-size"))
  80                 ci_leaf_init(this_leaf++, np, CACHE_TYPE_INST, level);
  81         if (of_property_read_bool(np, "d-cache-size"))
  82                 ci_leaf_init(this_leaf++, np, CACHE_TYPE_DATA, level);
  83
  84         while ((np = of_find_next_cache_node(np))) {
  85                 if (!of_device_is_compatible(np, "cache"))
  86                         break;
  87                 if (of_property_read_u32(np, "cache-level", &level))
  88                         break;
  89                 if (level <= levels)
  90                         break;
  91                 if (of_property_read_bool(np, "cache-size"))
  92                         ci_leaf_init(this_leaf++, np, CACHE_TYPE_UNIFIED, level);
  93                 if (of_property_read_bool(np, "i-cache-size"))
  94                         ci_leaf_init(this_leaf++, np, CACHE_TYPE_INST, level);
  95                 if (of_property_read_bool(np, "d-cache-size"))
  96                         ci_leaf_init(this_leaf++, np, CACHE_TYPE_DATA, level);
  97                 levels = level;
  98         }
  99
 100         return 0;
 101 }
 102
 103 DEFINE_SMP_CALL_CACHE_FUNCTION(init_cache_level)
 104 DEFINE_SMP_CALL_CACHE_FUNCTION(populate_cache_leaves)