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Message-ID: <2ef7c8f9-39cd-1c3c-6f96-9dd8cf5f851c@xilinx.com>
Date:   Wed, 9 Feb 2022 10:29:49 +0100
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Subject: Re: [PATCH v5 3/3] firmware: xilinx: Add sysfs support for feature
 config
Content-Language: en-US
To:     Ronak Jain <ronak.jain@xilinx.com>, <michal.simek@xilinx.com>,
        <linux-kernel@vger.kernel.org>
CC:     <gregkh@linuxfoundation.org>, <rajan.vaja@xilinx.com>,
        <corbet@lwn.net>, <linux-arm-kernel@lists.infradead.org>,
        <arnd@arndb.de>, <lakshmi.sai.krishna.potthuri@xilinx.com>
References: <20220209082709.32378-1-ronak.jain@xilinx.com>
 <20220209082709.32378-4-ronak.jain@xilinx.com>
From:   Michal Simek <michal.simek@xilinx.com>
In-Reply-To: <20220209082709.32378-4-ronak.jain@xilinx.com>
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On 2/9/22 09:27, Ronak Jain wrote:
> Add support for sysfs interface for runtime features configuration.
>   The user can configure the features at runtime. First, the user need
>   to select the config id of the supported features and then the user
>   can configure the parameters of the feature based on the config id.
> 
> Signed-off-by: Ronak Jain <ronak.jain@xilinx.com>
> ---
> Changes in v5:
> - None
> 
> Changes in v4:
> - Update commit message
> 
> Changes in v3:
> - Added zynqmp_devinfo structure to store device instances
> - Modified feature_conf_id from atomic variable to u32
> - Update commit message
> - Resolved merge conflicts
> 
> Changes in v2:
> - Update commit message
> ---
>   drivers/firmware/xilinx/zynqmp.c | 93 ++++++++++++++++++++++++++++++++
>   1 file changed, 93 insertions(+)
> 
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 0fa6cae4969d..7d8cb2ec6f8e 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -41,6 +41,16 @@ static DEFINE_HASHTABLE(pm_api_features_map, PM_API_FEATURE_CHECK_MAX_ORDER);
>   
>   static struct platform_device *em_dev;
>   
> +/**
> + * struct zynqmp_devinfo - Structure for Zynqmp device instance
> + * @dev:		Device Pointer
> + * @feature_conf_id:	Feature conf id
> + */
> +struct zynqmp_devinfo {
> +	struct device *dev;
> +	u32 feature_conf_id;
> +};
> +
>   /**
>    * struct pm_api_feature_data - PM API Feature data
>    * @pm_api_id:		PM API Id, used as key to index into hashmap
> @@ -1451,6 +1461,78 @@ static DEVICE_ATTR_RW(pggs1);
>   static DEVICE_ATTR_RW(pggs2);
>   static DEVICE_ATTR_RW(pggs3);
>   
> +static ssize_t feature_config_id_show(struct device *device,
> +				      struct device_attribute *attr,
> +				      char *buf)
> +{
> +	struct zynqmp_devinfo *devinfo = dev_get_drvdata(device);
> +
> +	return sysfs_emit(buf, "%d\n", devinfo->feature_conf_id);
> +}
> +
> +static ssize_t feature_config_id_store(struct device *device,
> +				       struct device_attribute *attr,
> +				       const char *buf, size_t count)
> +{
> +	u32 config_id;
> +	int ret;
> +	struct zynqmp_devinfo *devinfo = dev_get_drvdata(device);
> +
> +	if (!buf)
> +		return -EINVAL;
> +
> +	ret = kstrtou32(buf, 10, &config_id);
> +	if (ret)
> +		return ret;
> +
> +	devinfo->feature_conf_id = config_id;
> +
> +	return count;
> +}
> +
> +static DEVICE_ATTR_RW(feature_config_id);
> +
> +static ssize_t feature_config_value_show(struct device *device,
> +					 struct device_attribute *attr,
> +					 char *buf)
> +{
> +	int ret;
> +	u32 ret_payload[PAYLOAD_ARG_CNT];
> +	struct zynqmp_devinfo *devinfo = dev_get_drvdata(device);
> +
> +	ret = zynqmp_pm_get_feature_config(devinfo->feature_conf_id,
> +					   ret_payload);
> +	if (ret)
> +		return ret;
> +
> +	return sysfs_emit(buf, "%d\n", ret_payload[1]);
> +}
> +
> +static ssize_t feature_config_value_store(struct device *device,
> +					  struct device_attribute *attr,
> +					  const char *buf, size_t count)
> +{
> +	u32 value;
> +	int ret;
> +	struct zynqmp_devinfo *devinfo = dev_get_drvdata(device);
> +
> +	if (!buf)
> +		return -EINVAL;
> +
> +	ret = kstrtou32(buf, 10, &value);
> +	if (ret)
> +		return ret;
> +
> +	ret = zynqmp_pm_set_feature_config(devinfo->feature_conf_id,
> +					   value);
> +	if (ret)
> +		return ret;
> +
> +	return count;
> +}
> +
> +static DEVICE_ATTR_RW(feature_config_value);
> +
>   static struct attribute *zynqmp_firmware_attrs[] = {
>   	&dev_attr_ggs0.attr,
>   	&dev_attr_ggs1.attr,
> @@ -1462,6 +1544,8 @@ static struct attribute *zynqmp_firmware_attrs[] = {
>   	&dev_attr_pggs3.attr,
>   	&dev_attr_shutdown_scope.attr,
>   	&dev_attr_health_status.attr,
> +	&dev_attr_feature_config_id.attr,
> +	&dev_attr_feature_config_value.attr,
>   	NULL,
>   };
>   
> @@ -1471,6 +1555,7 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
>   	struct device_node *np;
> +	struct zynqmp_devinfo *devinfo;
>   	int ret;
>   
>   	np = of_find_compatible_node(NULL, NULL, "xlnx,zynqmp");
> @@ -1487,6 +1572,14 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
>   	if (ret)
>   		return ret;
>   
> +	devinfo = devm_kzalloc(dev, sizeof(*devinfo), GFP_KERNEL);
> +	if (!devinfo)
> +		return -ENOMEM;
> +
> +	devinfo->dev = dev;
> +
> +	platform_set_drvdata(pdev, devinfo);
> +
>   	/* Check PM API version number */
>   	ret = zynqmp_pm_get_api_version(&pm_api_version);
>   	if (ret)


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

Thanks,
Michal