linux-kernel - Re: [PATCH v4 15/15] arm64: dts: qcom: sm8550: add hwkm support to ufs ice

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Date: Sun, 28 Jan 2024 03:01:18 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Gaurav Kashyap <quic_gaurkash@...cinc.com>
Cc: linux-arm-msm@...r.kernel.org, linux-scsi@...r.kernel.org, 
	andersson@...nel.org, ebiggers@...gle.com, neil.armstrong@...aro.org, 
	srinivas.kandagatla@...aro.org, krzysztof.kozlowski+dt@...aro.org, 
	conor+dt@...nel.org, robh+dt@...nel.org, linux-kernel@...r.kernel.org, 
	linux-mmc@...r.kernel.org, kernel@...cinc.com, linux-crypto@...r.kernel.org, 
	devicetree@...r.kernel.org, quic_omprsing@...cinc.com, 
	quic_nguyenb@...cinc.com, bartosz.golaszewski@...aro.org, 
	konrad.dybcio@...aro.org, ulf.hansson@...aro.org, jejb@...ux.ibm.com, 
	martin.petersen@...cle.com, mani@...nel.org, davem@...emloft.net, 
	herbert@...dor.apana.org.au
Subject: Re: [PATCH v4 15/15] arm64: dts: qcom: sm8550: add hwkm support to
 ufs ice

On Sun, 28 Jan 2024 at 01:28, Gaurav Kashyap <quic_gaurkash@...cinc.com> wrote:
>
> The Inline Crypto Engine (ICE) for UFS/EMMC supports the
> Hardware Key Manager (HWKM) to securely manage storage
> keys. Enable using this hardware on sm8550.
>
> This requires two changes:
> 1. Register size increase: HWKM is an additional piece of hardware
>    sitting alongside ICE, and extends the old ICE's register space.
> 2. Explicitly tell the ICE driver to use HWKM with ICE so that
>    wrapped keys are used in sm8550.
>
> NOTE: Although wrapped keys cannot be independently generated and
> tested on this platform using generate, prepare and import key calls,
> there are non-kernel paths to create wrapped keys, and still use the
> kernel to program them into ICE. Hence, enabling wrapped key support
> on sm8550 too.
>
> Signed-off-by: Gaurav Kashyap <quic_gaurkash@...cinc.com>
> ---
>  arch/arm64/boot/dts/qcom/sm8550.dtsi | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm64/boot/dts/qcom/sm8550.dtsi b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> index ee1ba5a8c8fc..b5b41d0a544c 100644
> --- a/arch/arm64/boot/dts/qcom/sm8550.dtsi
> +++ b/arch/arm64/boot/dts/qcom/sm8550.dtsi
> @@ -1977,7 +1977,8 @@ ufs_mem_hc: ufs@...4000 {
>                 ice: crypto@...8000 {
>                         compatible = "qcom,sm8550-inline-crypto-engine",
>                                      "qcom,inline-crypto-engine";
> -                       reg = <0 0x01d88000 0 0x8000>;
> +                       reg = <0 0x01d88000 0 0x10000>;

Does the driver fail gracefully with the old DT size? At least it
should not crash.

> +                       qcom,ice-use-hwkm;
>                         clocks = <&gcc GCC_UFS_PHY_ICE_CORE_CLK>;

-- 
With best wishes
Dmitry