linux-kernel - Re: [PATCH v6 3/4] fpga: dfl: add basic support for DFHv1

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Date:   Tue, 13 Dec 2022 13:26:20 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     matthew.gerlach@...ux.intel.com
Cc:     hao.wu@...el.com, russell.h.weight@...el.com,
        basheer.ahmed.muddebihal@...el.com, trix@...hat.com,
        mdf@...nel.org, linux-fpga@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        tianfei.zhang@...el.com, corbet@....net,
        gregkh@...uxfoundation.org, linux-serial@...r.kernel.org,
        jirislaby@...nel.org, geert+renesas@...der.be,
        andriy.shevchenko@...ux.intel.com,
        niklas.soderlund+renesas@...natech.se, macro@...am.me.uk,
        johan@...nel.org, lukas@...ner.de, ilpo.jarvinen@...ux.intel.com,
        marpagan@...hat.com
Subject: Re: [PATCH v6 3/4] fpga: dfl: add basic support for DFHv1

On 2022-12-09 at 13:45:22 -0800, matthew.gerlach@...ux.intel.com wrote:
> From: Matthew Gerlach <matthew.gerlach@...ux.intel.com>

[...]
 
>  /*
>   * when create sub feature instances, for private features, it doesn't need
>   * to provide resource size and feature id as they could be read from DFH
> @@ -1023,39 +1125,69 @@ static int
>  create_feature_instance(struct build_feature_devs_info *binfo,
>  			resource_size_t ofst, resource_size_t size, u16 fid)
>  {
> -	unsigned int irq_base, nr_irqs;
>  	struct dfl_feature_info *finfo;
> +	resource_size_t start, end;
> +	int dfh_psize = 0;
>  	u8 revision = 0;
> +	u64 v, addr_off;
> +	u8 dfh_ver = 0;
>  	int ret;
> -	u64 v;
>  
>  	if (fid != FEATURE_ID_AFU) {
>  		v = readq(binfo->ioaddr + ofst);
>  		revision = FIELD_GET(DFH_REVISION, v);
> -
> +		dfh_ver = FIELD_GET(DFH_VERSION, v);
>  		/* read feature size and id if inputs are invalid */
>  		size = size ? size : feature_size(v);
>  		fid = fid ? fid : feature_id(v);
> +		if (dfh_ver == 1) {
> +			dfh_psize = dfh_get_psize(binfo->ioaddr + ofst, size);
> +			if (dfh_psize < 0) {
> +				dev_err(binfo->dev,
> +					"failed to read size of DFHv1 parameters %d\n",
> +					dfh_psize);
> +				return dfh_psize;
> +			}
> +			dev_dbg(binfo->dev, "dfhv1_psize %d\n", dfh_psize);
> +		}
>  	}
>  
>  	if (binfo->len - ofst < size)
>  		return -EINVAL;
>  
> -	ret = parse_feature_irqs(binfo, ofst, fid, &irq_base, &nr_irqs);
> -	if (ret)
> -		return ret;
> -
> -	finfo = kzalloc(sizeof(*finfo), GFP_KERNEL);
> +	finfo = kzalloc(sizeof(*finfo) + dfh_psize, GFP_KERNEL);

Please use size_add(). See Documentation/process/deprecated.rst for
details.

Others look good to me.

Yilun