Re: [PATCH v2 4/6] fpga: dfl: add generic support for MSIX interrupts

[Andy Shevchenko]

On Fri, Sep 23, 2022 at 05:17:43AM -0700, matthew.gerlach@xxxxxxxxxxxxxxx wrote:
> From: Matthew Gerlach <matthew.gerlach@xxxxxxxxxxxxxxx>
> 
> Define and use a DFHv1 parameter to add generic support for MSIX
> interrupts for DFL devices.

...

> +	if (fid != FEATURE_ID_AFU && fid != PORT_FEATURE_ID_ERROR &&
> +	    fid != PORT_FEATURE_ID_UINT && fid != FME_FEATURE_ID_GLOBAL_ERR) {

> +

Unneeded blank line.

> +		v = FIELD_GET(DFH_VERSION, readq(base));
> +		switch (v) {

This v...

> +		case 0:
> +			break;
> +
> +		case 1:
> +			v =  readq(base + DFHv1_CSR_SIZE_GRP);

Extra space.

...and this v are semantically different. It's quite hard to deduce their
semantics.

> +			if (FIELD_GET(DFHv1_CSR_SIZE_GRP_HAS_PARAMS, v)) {
> +				off = dfl_find_param(base + DFHv1_PARAM_HDR, ofst,
> +						     DFHv1_PARAM_ID_MSIX);

I guess I have suggested to use temporary variable(s) here.

			void __iomem *dfhv1 = base + DFHv1...;
			void __iomem *nth;

> +				if (off >= 0) {

					nth = dfhv1 + off;

> +					ibase = readl(base + DFHv1_PARAM_HDR +
> +						      off + DFHv1_PARAM_MSIX_STARTV);
> +					inr = readl(base + DFHv1_PARAM_HDR +
> +						    off + DFHv1_PARAM_MSIX_NUMV);

					ibase = readl(nth + DFHv1_PARAM_MSIX_STARTV);
					inr = readl(nth + DFHv1_PARAM_MSIX_NUMV);

> +					dev_dbg(binfo->dev, "start %d num %d fid 0x%x\n",
> +						ibase, inr, fid);
> +				}
> +			}
> +			break;
> +
> +		default:
> +			dev_warn(binfo->dev, "unexpected DFH version %lld\n", v);
> +			break;
> +		}
> +	}

-- 
With Best Regards,
Andy Shevchenko