linux-kernel - Re: [PATCH] PCI: mvebu: Use for_each_of_range() iterator for parsing "ranges"

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Message-ID: <20241115073104.gsgf3xfbv4gg67ut@thinkpad>
Date: Fri, 15 Nov 2024 13:01:04 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: "Rob Herring (Arm)" <robh@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	Pali Rohár <pali@...nel.org>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: mvebu: Use for_each_of_range() iterator for parsing
 "ranges"

On Thu, Nov 07, 2024 at 09:32:55AM -0600, Rob Herring (Arm) wrote:
> The mvebu "ranges" is a bit unusual with its own encoding of addresses,
> but it's still just normal "ranges" as far as parsing is concerned.
> Convert mvebu_get_tgt_attr() to use the for_each_of_range() iterator
> instead of open coding the parsing.
> 
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>

LGTM!

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Could someone please verify it on mvebu machine?

- Mani

> ---
> Compile tested only.
> ---
>  drivers/pci/controller/pci-mvebu.c | 26 +++++++++-----------------
>  1 file changed, 9 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
> index 29fe09c99e7d..d4e3f1e76f84 100644
> --- a/drivers/pci/controller/pci-mvebu.c
> +++ b/drivers/pci/controller/pci-mvebu.c
> @@ -1179,37 +1179,29 @@ static int mvebu_get_tgt_attr(struct device_node *np, int devfn,
>  			      unsigned int *tgt,
>  			      unsigned int *attr)
>  {
> -	const int na = 3, ns = 2;
> -	const __be32 *range;
> -	int rlen, nranges, rangesz, pna, i;
> +	struct of_range range;
> +	struct of_range_parser parser;
>  
>  	*tgt = -1;
>  	*attr = -1;
>  
> -	range = of_get_property(np, "ranges", &rlen);
> -	if (!range)
> +	if (of_pci_range_parser_init(&parser, np))
>  		return -EINVAL;
>  
> -	pna = of_n_addr_cells(np);
> -	rangesz = pna + na + ns;
> -	nranges = rlen / sizeof(__be32) / rangesz;
> -
> -	for (i = 0; i < nranges; i++, range += rangesz) {
> -		u32 flags = of_read_number(range, 1);
> -		u32 slot = of_read_number(range + 1, 1);
> -		u64 cpuaddr = of_read_number(range + na, pna);
> +	for_each_of_range(&parser, &range) {
>  		unsigned long rtype;
> +		u32 slot = upper_32_bits(range.bus_addr);
>  
> -		if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_IO)
> +		if (DT_FLAGS_TO_TYPE(range.flags) == DT_TYPE_IO)
>  			rtype = IORESOURCE_IO;
> -		else if (DT_FLAGS_TO_TYPE(flags) == DT_TYPE_MEM32)
> +		else if (DT_FLAGS_TO_TYPE(range.flags) == DT_TYPE_MEM32)
>  			rtype = IORESOURCE_MEM;
>  		else
>  			continue;
>  
>  		if (slot == PCI_SLOT(devfn) && type == rtype) {
> -			*tgt = DT_CPUADDR_TO_TARGET(cpuaddr);
> -			*attr = DT_CPUADDR_TO_ATTR(cpuaddr);
> +			*tgt = DT_CPUADDR_TO_TARGET(range.cpu_addr);
> +			*attr = DT_CPUADDR_TO_ATTR(range.cpu_addr);
>  			return 0;
>  		}
>  	}
> -- 
> 2.45.2
> 

-- 
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