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Date:   Fri, 29 Apr 2022 10:35:39 +0200
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Subject: Re: [PATCH 3/4] firmware: xilinx: always check API version for
 IOCTL/QUERY
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To:     Ronak Jain <ronak.jain@xilinx.com>, <michal.simek@xilinx.com>,
        <linux-kernel@vger.kernel.org>
CC:     <gregkh@linuxfoundation.org>, <corbet@lwn.net>,
        <linux-arm-kernel@lists.infradead.org>, <arnd@arndb.de>,
        <lakshmi.sai.krishna.potthuri@xilinx.com>, <radheys@xilinx.com>
References: <1649242526-17493-1-git-send-email-ronak.jain@xilinx.com>
 <1649242526-17493-4-git-send-email-ronak.jain@xilinx.com>
From:   Michal Simek <michal.simek@xilinx.com>
In-Reply-To: <1649242526-17493-4-git-send-email-ronak.jain@xilinx.com>
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On 4/6/22 12:55, Ronak Jain wrote:
> Currently, we are not checking feature check version for PM APIs as
> the support may or may not there in the firmware. To check the whether
> the feature check API is supported or not in the firmware, allow
> checking for its own version.
> 
> Signed-off-by: Ronak Jain <ronak.jain@xilinx.com>
> ---
>   drivers/firmware/xilinx/zynqmp.c | 39 ++++++++++++++++++++++++---------------
>   1 file changed, 24 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index d27a3b20227b..6ee94f31ac98 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -175,7 +175,7 @@ static noinline int do_fw_call_hvc(u64 arg0, u64 arg1, u64 arg2,
>   	return zynqmp_pm_ret_code((enum pm_ret_status)res.a0);
>   }
>   
> -static int do_feature_check_call(const u32 api_id, u32 *ret_payload)
> +static int __do_feature_check_call(const u32 api_id, u32 *ret_payload)
>   {
>   	int ret;
>   	u64 smc_arg[2];
> @@ -192,22 +192,12 @@ static int do_feature_check_call(const u32 api_id, u32 *ret_payload)
>   	return ret;
>   }
>   
> -/**
> - * zynqmp_pm_feature() - Check whether given feature is supported or not and
> - *			 store supported IOCTL/QUERY ID mask
> - * @api_id:		API ID to check
> - *
> - * Return: Returns status, either success or error+reason
> - */
> -int zynqmp_pm_feature(const u32 api_id)
> +static int do_feature_check_call(const u32 api_id)
>   {
>   	int ret;
>   	u32 ret_payload[PAYLOAD_ARG_CNT];
>   	struct pm_api_feature_data *feature_data;
>   
> -	if (!feature_check_enabled)
> -		return 0;
> -
>   	/* Check for existing entry in hash table for given api */
>   	hash_for_each_possible(pm_api_features_map, feature_data, hentry,
>   			       api_id) {
> @@ -221,7 +211,7 @@ int zynqmp_pm_feature(const u32 api_id)
>   		return -ENOMEM;
>   
>   	feature_data->pm_api_id = api_id;
> -	ret = do_feature_check_call(api_id, ret_payload);
> +	ret = __do_feature_check_call(api_id, ret_payload);
>   
>   	feature_data->feature_status = ret;
>   	hash_add(pm_api_features_map, &feature_data->hentry, api_id);
> @@ -238,6 +228,25 @@ int zynqmp_pm_feature(const u32 api_id)
>   EXPORT_SYMBOL_GPL(zynqmp_pm_feature);
>   
>   /**
> + * zynqmp_pm_feature() - Check whether given feature is supported or not and
> + *			 store supported IOCTL/QUERY ID mask
> + * @api_id:		API ID to check
> + *
> + * Return: Returns status, either success or error+reason
> + */
> +int zynqmp_pm_feature(const u32 api_id)
> +{
> +	int ret;
> +
> +	if (!feature_check_enabled)
> +		return 0;
> +
> +	ret = do_feature_check_call(api_id);
> +
> +	return ret;
> +}
> +
> +/**
>    * zynqmp_pm_is_function_supported() - Check whether given IOCTL/QUERY function
>    *				       is supported or not
>    * @api_id:		PM_IOCTL or PM_QUERY_DATA
> @@ -255,7 +264,7 @@ int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id)
>   		return -EINVAL;
>   
>   	/* Check feature check API version */
> -	ret = zynqmp_pm_feature(PM_FEATURE_CHECK);
> +	ret = do_feature_check_call(PM_FEATURE_CHECK);
>   	if (ret < 0)
>   		return ret;
>   
> @@ -265,7 +274,7 @@ int zynqmp_pm_is_function_supported(const u32 api_id, const u32 id)
>   		 * Call feature check for IOCTL/QUERY API to get IOCTL ID or
>   		 * QUERY ID feature status.
>   		 */
> -		ret = zynqmp_pm_feature(api_id);
> +		ret = do_feature_check_call(api_id);
>   		if (ret < 0)
>   			return ret;
>   


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

Thanks,
Michal