linux-kernel - [PATCH] RISC-V: cacheinfo: add init_cache

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Message-Id: <20240122013510.55788-1-cuiyunhui@bytedance.com>
Date: Mon, 22 Jan 2024 09:35:10 +0800
From: Yunhui Cui <cuiyunhui@...edance.com>
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	aou@...s.berkeley.edu,
	cuiyunhui@...edance.com,
	conor.dooley@...rochip.com,
	robh@...nel.org,
	sudeep.holla@....com,
	pierre.gondois@....com,
	suagrfillet@...il.com,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] RISC-V: cacheinfo: add init_cache_level()

When cacheinfo_sysfs_init() is executed, the general weak function
init_cache_level() returns -ENOENT, causing failure to add the "cache"
node to /sys/devices/system/cpu/cpux/. Implement the init_cache_level()
function on RISC-V to fix it.

Signed-off-by: Yunhui Cui <cuiyunhui@...edance.com>
---
 arch/riscv/kernel/cacheinfo.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/riscv/kernel/cacheinfo.c b/arch/riscv/kernel/cacheinfo.c
index 09e9b88110d1..be9169a38bac 100644
--- a/arch/riscv/kernel/cacheinfo.c
+++ b/arch/riscv/kernel/cacheinfo.c
@@ -71,6 +71,12 @@ static void ci_leaf_init(struct cacheinfo *this_leaf,
 	this_leaf->type = type;
 }
 
+int init_cache_level(unsigned int cpu)
+{
+	/* The topology has been parsed by acpi or dt, return true. */
+	return 0;
+}
+
 int populate_cache_leaves(unsigned int cpu)
 {
 	struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
-- 
2.20.1