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

[Om Prakash Singh <quic_omprsing@quicinc.com>]

On 1/28/2024 6:31 AM, Dmitry Baryshkov wrote:
> On Sun, 28 Jan 2024 at 01:28, Gaurav Kashyap <quic_gaurkash@quicinc.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@quicinc.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@1d84000 {
>>                  ice: crypto@1d88000 {
>>                          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.
When adding  qcom,ice-use-hwkm property, DT size needs to be updated.
Without any DT change, there will be know issue.

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