Re: [PATCH] arm64: dts: rockchip: rk3576: add cache hierarchy information to CPU nodes

From: Sebastian Reichel

Date: Tue Aug 11 2026 - 06:44:44 EST

Hi,

On Tue, Jul 28, 2026 at 05:46:14PM +0000, Cole Munz wrote:
> The RK3576 CPU nodes carry no cache properties, so cache_setup_of_node()
> fails with -ENOENT on the first CPU. That error propagates out of
> cache_shared_cpu_map_setup(), which discards the topology arm64 had
> already derived from CLIDR, and the boot log gets
>
> cacheinfo: Unable to detect cache hierarchy for CPU 0
>
> Add L1 i/d cache size, line-size and sets to all eight CPU nodes, plus
> per-cluster unified L2 nodes wired up through next-level-cache. Sizes
> come from the RK3576 datasheet: the Cortex-A72 cluster has 48KB L1 I and
> 32KB L1 D per core with 1MB of L2, the Cortex-A53 cluster has 32KB L1 I
> and 32KB L1 D per core with 512KB of L2. Line size and associativity are
> architecturally fixed per the Cortex-A53 and Cortex-A72 TRMs, so the
> *-sets values follow as size / (line-size * ways).
>
> With this applied, lscpu reports the full hierarchy instead of only the
> level, type and shared_cpu_list:
>
> NAME ONE-SIZE ALL-SIZE WAYS TYPE LEVEL SETS PHY-LINE COHERENCY-SIZE
> L1d 32K 256K 4 Data 1 128 64
> L1i 32K 320K 2 Instruction 1 256 64
> L2 512K 1.5M 16 Unified 2 512 64
>
> Tested-by: Alexey Charkov <alchark@xxxxxxxxxxx>
> Signed-off-by: Cole Munz <Munzzyy1@xxxxxxxxx>
> ---

I've checked the numbers against RK3576 TRM and ARM information.
Looks all good to me:

Reviewed-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>

Greetings,

-- Sebastian

> arch/arm64/boot/dts/rockchip/rk3576.dtsi | 74 ++++++++++++++++++++++++
> 1 file changed, 74 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3576.dtsi b/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> index e12a2a0cfb89..656513aa999f 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3576.dtsi
> @@ -117,6 +117,13 @@ cpu_l0: cpu@0 {
> dynamic-power-coefficient = <120>;
> cpu-idle-states = <&CPU_SLEEP>;
> #cooling-cells = <2>;
> + i-cache-size = <0x8000>;
> + i-cache-line-size = <64>;
> + i-cache-sets = <256>;
> + d-cache-size = <0x8000>;
> + d-cache-line-size = <64>;
> + d-cache-sets = <128>;
> + next-level-cache = <&l2_cache_l>;
> };
>
> cpu_l1: cpu@1 {
> @@ -129,6 +136,13 @@ cpu_l1: cpu@1 {
> operating-points-v2 = <&cluster0_opp_table>;
> cpu-idle-states = <&CPU_SLEEP>;
> #cooling-cells = <2>;
> + i-cache-size = <0x8000>;
> + i-cache-line-size = <64>;
> + i-cache-sets = <256>;
> + d-cache-size = <0x8000>;
> + d-cache-line-size = <64>;
> + d-cache-sets = <128>;
> + next-level-cache = <&l2_cache_l>;
> };
>
> cpu_l2: cpu@2 {
> @@ -141,6 +155,13 @@ cpu_l2: cpu@2 {
> operating-points-v2 = <&cluster0_opp_table>;
> cpu-idle-states = <&CPU_SLEEP>;
> #cooling-cells = <2>;
> + i-cache-size = <0x8000>;
> + i-cache-line-size = <64>;
> + i-cache-sets = <256>;
> + d-cache-size = <0x8000>;
> + d-cache-line-size = <64>;
> + d-cache-sets = <128>;
> + next-level-cache = <&l2_cache_l>;
> };
>
> cpu_l3: cpu@3 {
> @@ -153,6 +174,13 @@ cpu_l3: cpu@3 {
> operating-points-v2 = <&cluster0_opp_table>;
> cpu-idle-states = <&CPU_SLEEP>;
> #cooling-cells = <2>;
> + i-cache-size = <0x8000>;
> + i-cache-line-size = <64>;
> + i-cache-sets = <256>;
> + d-cache-size = <0x8000>;
> + d-cache-line-size = <64>;
> + d-cache-sets = <128>;
> + next-level-cache = <&l2_cache_l>;
> };
>
> cpu_b0: cpu@100 {
> @@ -166,6 +194,13 @@ cpu_b0: cpu@100 {
> dynamic-power-coefficient = <320>;
> cpu-idle-states = <&CPU_SLEEP>;
> #cooling-cells = <2>;
> + i-cache-size = <0xc000>;
> + i-cache-line-size = <64>;
> + i-cache-sets = <256>;
> + d-cache-size = <0x8000>;
> + d-cache-line-size = <64>;
> + d-cache-sets = <256>;
> + next-level-cache = <&l2_cache_b>;
> };
>
> cpu_b1: cpu@101 {
> @@ -178,6 +213,13 @@ cpu_b1: cpu@101 {
> operating-points-v2 = <&cluster1_opp_table>;
> cpu-idle-states = <&CPU_SLEEP>;
> #cooling-cells = <2>;
> + i-cache-size = <0xc000>;
> + i-cache-line-size = <64>;
> + i-cache-sets = <256>;
> + d-cache-size = <0x8000>;
> + d-cache-line-size = <64>;
> + d-cache-sets = <256>;
> + next-level-cache = <&l2_cache_b>;
> };
>
> cpu_b2: cpu@102 {
> @@ -190,6 +232,13 @@ cpu_b2: cpu@102 {
> operating-points-v2 = <&cluster1_opp_table>;
> cpu-idle-states = <&CPU_SLEEP>;
> #cooling-cells = <2>;
> + i-cache-size = <0xc000>;
> + i-cache-line-size = <64>;
> + i-cache-sets = <256>;
> + d-cache-size = <0x8000>;
> + d-cache-line-size = <64>;
> + d-cache-sets = <256>;
> + next-level-cache = <&l2_cache_b>;
> };
>
> cpu_b3: cpu@103 {
> @@ -202,6 +251,31 @@ cpu_b3: cpu@103 {
> operating-points-v2 = <&cluster1_opp_table>;
> cpu-idle-states = <&CPU_SLEEP>;
> #cooling-cells = <2>;
> + i-cache-size = <0xc000>;
> + i-cache-line-size = <64>;
> + i-cache-sets = <256>;
> + d-cache-size = <0x8000>;
> + d-cache-line-size = <64>;
> + d-cache-sets = <256>;
> + next-level-cache = <&l2_cache_b>;
> + };
> +
> + l2_cache_l: l2-cache-cluster0 {
> + compatible = "cache";
> + cache-level = <2>;
> + cache-unified;
> + cache-size = <0x80000>;
> + cache-line-size = <64>;
> + cache-sets = <512>;
> + };
> +
> + l2_cache_b: l2-cache-cluster1 {
> + compatible = "cache";
> + cache-level = <2>;
> + cache-unified;
> + cache-size = <0x100000>;
> + cache-line-size = <64>;
> + cache-sets = <1024>;
> };
>
> idle-states {
> --
> 2.55.0
>
>

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