redonkable/alistair23-linux
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riscv: Add support to determine no. of L2 cache way enabled

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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>
Reviewed-by: Anup Patel <anup@brainfault.org>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Yash Shah 2020-02-20 10:45:19 +05:30 committed by Palmer Dabbelt
parent 087958a176
commit 4a3a373312
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GPG key ID: 2E1319F35FBB1889
1 changed files with 38 additions and 0 deletions
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38
drivers/soc/sifive/sifive_l2_cache.c
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@ -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);
static int l2_largest_wayenabled(void)
{
return readl(l2_base + SIFIVE_L2_WAYENABLE) & 0xFF;
}
static ssize_t number_of_ways_enabled_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return sprintf(buf, "%u\n", 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