Re: [RFC PATCH 2/6] firmware: xilinx: Add ZynqMP SHA API for SHA3 functionality

[Michal Simek <michal.simek@xilinx.com>]

On 11/29/21 20:20, Harsha wrote:
> This patch adds zynqmp_pm_sha_hash API in the ZynqMP firmware to compute
> SHA3 hash of given data.
> 
> Signed-off-by: Harsha <harsha.harsha@xilinx.com>
> ---
>   drivers/firmware/xilinx/zynqmp.c     | 26 ++++++++++++++++++++++++++
>   include/linux/firmware/xlnx-zynqmp.h |  8 ++++++++
>   2 files changed, 34 insertions(+)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 3dd45a7..a84c5ea 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -1117,6 +1117,32 @@ int zynqmp_pm_aes_engine(const u64 address, u32 *out)
>   EXPORT_SYMBOL_GPL(zynqmp_pm_aes_engine);
>   
>   /**
> + * zynqmp_pm_sha_hash - Access the SHA engine to calculate the hash
> + * @address:	Address of the data/ Address of output buffer where
> + *		hash should be stored.
> + * @size:	Size of the data.
> + * @flags:
> + *	BIT(0) - for initializing csudma driver and SHA3(Here address
> + *		 and size inputs can be NULL).
> + *	BIT(1) - to call Sha3_Update API which can be called multiple
> + *		 times when data is not contiguous.
> + *	BIT(2) - to get final hash of the whole updated data.
> + *		 Hash will be overwritten at provided address with
> + *		 48 bytes.
> + *
> + * Return:	Returns status, either success or error code.
> + */
> +int zynqmp_pm_sha_hash(const u64 address, const u32 size, const u32 flags)
> +{
> +	u32 lower_addr = lower_32_bits(address);
> +	u32 upper_addr = upper_32_bits(address);
> +
> +	return zynqmp_pm_invoke_fn(PM_SECURE_SHA, upper_addr, lower_addr,
> +				   size, flags, NULL);
> +}
> +EXPORT_SYMBOL_GPL(zynqmp_pm_sha_hash);
> +
> +/**
>    * zynqmp_pm_system_shutdown - PM call to request a system shutdown or restart
>    * @type:	Shutdown or restart? 0 for shutdown, 1 for restart
>    * @subtype:	Specifies which system should be restarted or shut down
> diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
> index 47fd4e5..38ef708 100644
> --- a/include/linux/firmware/xlnx-zynqmp.h
> +++ b/include/linux/firmware/xlnx-zynqmp.h
> @@ -78,6 +78,7 @@ enum pm_api_id {
>   	PM_FPGA_LOAD = 22,
>   	PM_FPGA_GET_STATUS = 23,
>   	PM_GET_CHIPID = 24,
> +	PM_SECURE_SHA = 26,
>   	PM_PINCTRL_REQUEST = 28,
>   	PM_PINCTRL_RELEASE = 29,
>   	PM_PINCTRL_GET_FUNCTION = 30,
> @@ -410,6 +411,7 @@ int zynqmp_pm_set_requirement(const u32 node, const u32 capabilities,
>   			      const u32 qos,
>   			      const enum zynqmp_pm_request_ack ack);
>   int zynqmp_pm_aes_engine(const u64 address, u32 *out);
> +int zynqmp_pm_sha_hash(const u64 address, const u32 size, const u32 flags);
>   int zynqmp_pm_fpga_load(const u64 address, const u32 size, const u32 flags);
>   int zynqmp_pm_fpga_get_status(u32 *value);
>   int zynqmp_pm_write_ggs(u32 index, u32 value);
> @@ -581,6 +583,12 @@ static inline int zynqmp_pm_aes_engine(const u64 address, u32 *out)
>   	return -ENODEV;
>   }
>   
> +static inline int zynqmp_pm_sha_hash(const u64 address, const u32 size,
> +				     const u32 flags)
> +{
> +	return -ENODEV;
> +}
> +
>   static inline int zynqmp_pm_fpga_load(const u64 address, const u32 size,
>   				      const u32 flags)
>   {
> 

Acked-by: Michal Simek <michal.simek@xilinx.com>

Thanks,
Michal