linux-kernel - Re: [PATCH V4 3/4] firmware: xilinx: Add ZynqMP aes API for AES functionality

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Message-ID: <3357664b-d502-ca0c-c166-679001de5f39@seznam.cz>
Date:   Tue, 21 Jan 2020 10:15:50 +0100
From:   Michal Simek <monstr@...nam.cz>
To:     Kalyani Akula <kalyani.akula@...inx.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     git <git@...inx.com>, Harsh Jain <harshj@...inx.com>,
        Sarat Chand Savitala <saratcha@...inx.com>,
        Mohan <mohand@...inx.com>, Kalyani Akul <kalyania@...inx.com>
Subject: Re: [PATCH V4 3/4] firmware: xilinx: Add ZynqMP aes API for AES
 functionality

On 20. 11. 19 8:44, Kalyani Akula wrote:
> Add ZynqMP firmware AES API to perform encryption/decryption of given data.
> 
> Signed-off-by: Kalyani Akula <kalyani.akula@...inx.com>
> ---
>  drivers/firmware/xilinx/zynqmp.c     | 23 +++++++++++++++++++++++
>  include/linux/firmware/xlnx-zynqmp.h |  2 ++
>  2 files changed, 25 insertions(+)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index fd3d837..7ddf38e 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -664,6 +664,28 @@ static int zynqmp_pm_set_requirement(const u32 node, const u32 capabilities,
>  				   qos, ack, NULL);
>  }
>  
> +/**
> + * zynqmp_pm_aes - Access AES hardware to encrypt/decrypt the data using
> + * AES-GCM core.
> + * @address:	Address of the AesParams structure.
> + * @out:	Returned output value
> + *
> + * Return:	Returns status, either success or error code.
> + */
> +static int zynqmp_pm_aes_engine(const u64 address, u32 *out)
> +{
> +	u32 ret_payload[PAYLOAD_ARG_CNT];
> +	int ret;
> +
> +	if (!out)
> +		return -EINVAL;
> +
> +	ret = zynqmp_pm_invoke_fn(PM_SECURE_AES, upper_32_bits(address),
> +				  lower_32_bits(address),
> +				  0, 0, ret_payload);
> +	*out = ret_payload[1];

newline here please.

> +	return ret;
> +}


newline here please.

>  static const struct zynqmp_eemi_ops eemi_ops = {
>  	.get_api_version = zynqmp_pm_get_api_version,
>  	.get_chipid = zynqmp_pm_get_chipid,
> @@ -687,6 +709,7 @@ static int zynqmp_pm_set_requirement(const u32 node, const u32 capabilities,
>  	.set_requirement = zynqmp_pm_set_requirement,
>  	.fpga_load = zynqmp_pm_fpga_load,
>  	.fpga_get_status = zynqmp_pm_fpga_get_status,
> +	.aes = zynqmp_pm_aes_engine,
>  };
>  
>  /**
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index 778abbb..508edd7 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -77,6 +77,7 @@ enum pm_api_id {
>  	PM_CLOCK_GETRATE,
>  	PM_CLOCK_SETPARENT,
>  	PM_CLOCK_GETPARENT,
> +	PM_SECURE_AES = 47,
>  };
>  
>  /* PMU-FW return status codes */
> @@ -294,6 +295,7 @@ struct zynqmp_eemi_ops {
>  			       const u32 capabilities,
>  			       const u32 qos,
>  			       const enum zynqmp_pm_request_ack ack);
> +	int (*aes)(const u64 address, u32 *out);
>  };
>  
>  int zynqmp_pm_invoke_fn(u32 pm_api_id, u32 arg0, u32 arg1,
> 

Thanks,
Michal