riscv: Add support to determine no. of L2 cache way enabled
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>
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@ -9,6 +9,8 @@
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#include <linux/interrupt.h>
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#include <linux/of_irq.h>
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#include <linux/of_address.h>
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#include <linux/device.h>
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#include <asm/cacheinfo.h>
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#include <soc/sifive/sifive_l2_cache.h>
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#define SIFIVE_L2_DIRECCFIX_LOW 0x100
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@ -31,6 +33,7 @@
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static void __iomem *l2_base;
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static int g_irq[SIFIVE_L2_MAX_ECCINTR];
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static struct riscv_cacheinfo_ops l2_cache_ops;
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enum {
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DIR_CORR = 0,
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@ -107,6 +110,38 @@ int unregister_sifive_l2_error_notifier(struct notifier_block *nb)
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}
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EXPORT_SYMBOL_GPL(unregister_sifive_l2_error_notifier);
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static int l2_largest_wayenabled(void)
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{
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return readl(l2_base + SIFIVE_L2_WAYENABLE) & 0xFF;
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}
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static ssize_t number_of_ways_enabled_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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return sprintf(buf, "%u\n", l2_largest_wayenabled());
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}
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static DEVICE_ATTR_RO(number_of_ways_enabled);
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static struct attribute *priv_attrs[] = {
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&dev_attr_number_of_ways_enabled.attr,
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NULL,
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};
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static const struct attribute_group priv_attr_group = {
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.attrs = priv_attrs,
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};
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const struct attribute_group *l2_get_priv_group(struct cacheinfo *this_leaf)
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{
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/* We want to use private group for L2 cache only */
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if (this_leaf->level == 2)
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return &priv_attr_group;
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else
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return NULL;
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}
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static irqreturn_t l2_int_handler(int irq, void *device)
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{
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unsigned int add_h, add_l;
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@ -170,6 +205,9 @@ static int __init sifive_l2_init(void)
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l2_config_read();
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l2_cache_ops.get_priv_group = l2_get_priv_group;
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riscv_set_cacheinfo_ops(&l2_cache_ops);
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#ifdef CONFIG_DEBUG_FS
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setup_sifive_debug();
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#endif
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