[PATCH v3 1/3] riscv: Set more data to cacheinfo

[Zong Li]

Set cacheinfo.{size,sets,line_size} for each cache node, then we can
get these information from userland through auxiliary vector.

Signed-off-by: Zong Li <zong...@sifive.com>
---
 arch/riscv/kernel/cacheinfo.c | 59 ++++++++++++++++++++++++++---------
 1 file changed, 44 insertions(+), 15 deletions(-)

diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c
index bd0f122965c3..8b85abfbd77a 100644
--- a/arch/riscv/kernel/cacheinfo.c
+++ b/arch/riscv/kernel/cacheinfo.c
@@ -25,12 +25,46 @@ cache_get_priv_group(struct cacheinfo *this_leaf)
        return NULL;
 }
 
-static void ci_leaf_init(struct cacheinfo *this_leaf,
-                        struct device_node *node,
-                        enum cache_type type, unsigned int level)
+static void ci_leaf_init(struct cacheinfo *this_leaf, enum cache_type type,
+                        unsigned int level, unsigned int size,
+                        unsigned int sets, unsigned int line_size)
 {
        this_leaf->level = level;
        this_leaf->type = type;
+       this_leaf->size = size;
+       this_leaf->number_of_sets = sets;
+       this_leaf->coherency_line_size = line_size;
+
+       /*
+        * If the cache is fully associative, there is no need to
+        * check the other properties.
+        */
+       if (!(sets == 1) && (sets > 0 && size > 0 && line_size > 0))
+               this_leaf->ways_of_associativity = (size / sets) / line_size;
+}
+
+static void fill_cacheinfo(struct cacheinfo **this_leaf,
+                          struct device_node *node, unsigned int level)
+{
+       unsigned int size, sets, line_size;
+
+       if (!of_property_read_u32(node, "cache-size", &size) &&
+           !of_property_read_u32(node, "cache-block-size", &line_size) &&
+           !of_property_read_u32(node, "cache-sets", &sets)) {
+               ci_leaf_init((*this_leaf)++, CACHE_TYPE_UNIFIED, level, size, 
sets, line_size);
+       }
+
+       if (!of_property_read_u32(node, "i-cache-size", &size) &&
+           !of_property_read_u32(node, "i-cache-sets", &sets) &&
+           !of_property_read_u32(node, "i-cache-block-size", &line_size)) {
+               ci_leaf_init((*this_leaf)++, CACHE_TYPE_INST, level, size, 
sets, line_size);
+       }
+
+       if (!of_property_read_u32(node, "d-cache-size", &size) &&
+           !of_property_read_u32(node, "d-cache-sets", &sets) &&
+           !of_property_read_u32(node, "d-cache-block-size", &line_size)) {
+               ci_leaf_init((*this_leaf)++, CACHE_TYPE_DATA, level, size, 
sets, line_size);
+       }
 }
 
 static int __init_cache_level(unsigned int cpu)
@@ -83,29 +117,24 @@ static int __populate_cache_leaves(unsigned int cpu)
        struct device_node *prev = NULL;
        int levels = 1, level = 1;
 
-       if (of_property_read_bool(np, "cache-size"))
-               ci_leaf_init(this_leaf++, np, CACHE_TYPE_UNIFIED, level);
-       if (of_property_read_bool(np, "i-cache-size"))
-               ci_leaf_init(this_leaf++, np, CACHE_TYPE_INST, level);
-       if (of_property_read_bool(np, "d-cache-size"))
-               ci_leaf_init(this_leaf++, np, CACHE_TYPE_DATA, level);
+       /* Level 1 caches in cpu node */
+       fill_cacheinfo(&this_leaf, np, level);
 
+       /* Next level caches in cache nodes */
        prev = np;
        while ((np = of_find_next_cache_node(np))) {
                of_node_put(prev);
                prev = np;
+
                if (!of_device_is_compatible(np, "cache"))
                        break;
                if (of_property_read_u32(np, "cache-level", &level))
                        break;
                if (level <= levels)
                        break;
-               if (of_property_read_bool(np, "cache-size"))
-                       ci_leaf_init(this_leaf++, np, CACHE_TYPE_UNIFIED, 
level);
-               if (of_property_read_bool(np, "i-cache-size"))
-                       ci_leaf_init(this_leaf++, np, CACHE_TYPE_INST, level);
-               if (of_property_read_bool(np, "d-cache-size"))
-                       ci_leaf_init(this_leaf++, np, CACHE_TYPE_DATA, level);
+
+               fill_cacheinfo(&this_leaf, np, level);
+
                levels = level;
        }
        of_node_put(np);
-- 
2.28.0