linux-kernel - Re: [PATCH 2/7] MIPS: SGI-IP27: clean up bridge access and header files

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Message-ID: <20190128132003.GA744@infradead.org>
Date:   Mon, 28 Jan 2019 05:20:03 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Thomas Bogendoerfer <tbogendoerfer@...e.de>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        James Hogan <jhogan@...nel.org>, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-pci@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Paul Burton <paul.burton@...s.com>,
        Ralf Baechle <ralf@...ux-mips.org>
Subject: Re: [PATCH 2/7] MIPS: SGI-IP27: clean up bridge access and header
 files

On Thu, Jan 24, 2019 at 06:47:23PM +0100, Thomas Bogendoerfer wrote:
>  #ifndef __ASSEMBLY__
> +/* Address translation entry for mapped pci32 accesses */
> +union bridge_ate {
> +	u64	ent;
> +	struct ate_s {
> +		u64	rmf:16;
> +		u64	addr:36;
> +		u64	targ:4;
> +		u64	reserved:3;
> +		u64	barrier:1;
> +		u64	prefetch:1;
> +		u64	precise:1;
> +		u64	coherent:1;
> +		u64	valid:1;
> +	} field;

Note that we generally try to avoid using bitfields for hardware
descriptions and instead use masking/shifting, possibly hidden in
macros.  The portability argument for that doesn't really apply
here as the code is obviously MIPS/big endian specific, but I think
it generally is a good example and more readable as well.