Re: [PATCH v2 3/6] soc: sifive: ccache: determine the cache level from dts

[off-list ref] 於 2022年9月6日 週二 凌晨2:56寫道：

On 05/09/2022 09:31, Zong Li wrote:

quoted

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Composable cache could be L2 or L3 cache, use 'cache-level' property of
device node to determine the level.

Signed-off-by: Zong Li <redacted>
Signed-off-by: Greentime Hu <greentime.hu@sifive.com>
---
 drivers/soc/sifive/sifive_ccache.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/sifive/sifive_ccache.c b/drivers/soc/sifive/sifive_ccache.c
index 1b16a196547f..0e0eb85c94d8 100644
--- a/drivers/soc/sifive/sifive_ccache.c
+++ b/drivers/soc/sifive/sifive_ccache.c

@@ -38,6 +38,7 @@
 static void __iomem *ccache_base;
 static int g_irq[SIFIVE_CCACHE_MAX_ECCINTR];
 static struct riscv_cacheinfo_ops ccache_cache_ops;
+static int level;

Can you have a system with a composable l2 & l3 cache?

We don't have a system with composable L2 and L3 cache at same time.
But as I mentioned in the thread of second patch, we use another cache
as L2 when the composable cache used for L3.

quoted

 enum {
        DIR_CORR = 0,

@@ -143,7 +144,7 @@ static const struct attribute_group priv_attr_group = {
 static const struct attribute_group *ccache_get_priv_group(struct cacheinfo *this_leaf)
 {
        /* We want to use private group for composable cache only */
-       if (this_leaf->level == 2)
+       if (this_leaf->level == level)
                return &priv_attr_group;
        else
                return NULL;

@@ -210,6 +211,9 @@ static int __init sifive_ccache_init(void)
        if (!ccache_base)
                return -ENOMEM;

+       if (of_property_read_u32(np, "cache-level", &level))
+               return -ENODEV;
+
        intr_num = of_property_count_u32_elems(np, "interrupts");
        if (!intr_num) {
                pr_err("CCACHE: no interrupts property\n");
--

2.17.1