lkml.org 
[lkml]   [2020]   [Aug]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 1/3] riscv: Set more data to cacheinfo
Date
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.li@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
\
 
 \ /
  Last update: 2020-08-28 09:10    [W:0.073 / U:6.648 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site