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Subject[PATCH v3 2/2] riscv: Add support to determine no. of L2 cache way enabled
Date
In order to determine the number of L2 cache ways enabled at runtime,
implement a private attribute ("number_of_ways_enabled"). Reading this
attribute returns the number of enabled L2 cache ways at runtime.

Using riscv_set_cacheinfo_ops() hook a custom function, that returns
this private attribute, to the generic ops structure which is used by
cache_get_priv_group() in cacheinfo framework.

Signed-off-by: Yash Shah <yash.shah@sifive.com>
---
drivers/soc/sifive/sifive_l2_cache.c | 38 ++++++++++++++++++++++++++++++++++++
include/soc/sifive/sifive_l2_cache.h | 2 ++
2 files changed, 40 insertions(+)

diff --git a/drivers/soc/sifive/sifive_l2_cache.c b/drivers/soc/sifive/sifive_l2_cache.c
index a506939..8741885 100644
--- a/drivers/soc/sifive/sifive_l2_cache.c
+++ b/drivers/soc/sifive/sifive_l2_cache.c
@@ -9,6 +9,8 @@
#include <linux/interrupt.h>
#include <linux/of_irq.h>
#include <linux/of_address.h>
+#include <linux/device.h>
+#include <asm/cacheinfo.h>
#include <soc/sifive/sifive_l2_cache.h>

#define SIFIVE_L2_DIRECCFIX_LOW 0x100
@@ -31,6 +33,7 @@

static void __iomem *l2_base;
static int g_irq[SIFIVE_L2_MAX_ECCINTR];
+static struct riscv_cacheinfo_ops l2_cache_ops;

enum {
DIR_CORR = 0,
@@ -107,6 +110,38 @@ int unregister_sifive_l2_error_notifier(struct notifier_block *nb)
}
EXPORT_SYMBOL_GPL(unregister_sifive_l2_error_notifier);

+int sifive_l2_largest_wayenabled(void)
+{
+ return readl(l2_base + SIFIVE_L2_WAYENABLE);
+}
+
+static ssize_t number_of_ways_enabled_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ return sprintf(buf, "%u\n", sifive_l2_largest_wayenabled());
+}
+
+static DEVICE_ATTR_RO(number_of_ways_enabled);
+
+static struct attribute *priv_attrs[] = {
+ &dev_attr_number_of_ways_enabled.attr,
+ NULL,
+};
+
+static const struct attribute_group priv_attr_group = {
+ .attrs = priv_attrs,
+};
+
+const struct attribute_group *l2_get_priv_group(struct cacheinfo *this_leaf)
+{
+ /* We want to use private group for L2 cache only */
+ if (this_leaf->level == 2)
+ return &priv_attr_group;
+ else
+ return NULL;
+}
+
static irqreturn_t l2_int_handler(int irq, void *device)
{
unsigned int add_h, add_l;
@@ -170,6 +205,9 @@ static int __init sifive_l2_init(void)

l2_config_read();

+ l2_cache_ops.get_priv_group = l2_get_priv_group;
+ riscv_set_cacheinfo_ops(&l2_cache_ops);
+
#ifdef CONFIG_DEBUG_FS
setup_sifive_debug();
#endif
diff --git a/include/soc/sifive/sifive_l2_cache.h b/include/soc/sifive/sifive_l2_cache.h
index 92ade10..55feff5 100644
--- a/include/soc/sifive/sifive_l2_cache.h
+++ b/include/soc/sifive/sifive_l2_cache.h
@@ -10,6 +10,8 @@
extern int register_sifive_l2_error_notifier(struct notifier_block *nb);
extern int unregister_sifive_l2_error_notifier(struct notifier_block *nb);

+int sifive_l2_largest_wayenabled(void);
+
#define SIFIVE_L2_ERR_TYPE_CE 0
#define SIFIVE_L2_ERR_TYPE_UE 1

--
2.7.4
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