From: Thomas Bogendoerfer <tbogendoerfer@suse.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
James Hogan <jhogan@kernel.org>,
linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org,
linux-pci@vger.kernel.org,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Paul Burton <paul.burton@mips.com>,
Ralf Baechle <ralf@linux-mips.org>
Subject: Re: [PATCH 2/7] MIPS: SGI-IP27: clean up bridge access and header files
Date: Mon, 28 Jan 2019 14:24:40 +0100 [thread overview]
Message-ID: <20190128142440.591d2115ac7844863713aa77@suse.de> (raw)
In-Reply-To: <20190128132003.GA744@infradead.org>
On Mon, 28 Jan 2019 05:20:03 -0800
Christoph Hellwig <hch@infradead.org> wrote:
> 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.
I totally agreed. I only moved the original defintion around while cleaning
up the header file. Right now there is no code using it. Should I remove it
and access macros as soon there is a need for it ?
Thomas.
--
SUSE Linux GmbH
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
next prev parent reply other threads:[~2019-01-28 13:24 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-24 17:47 [PATCH 0/7] MIPS: SGI-IP27 rework Thomas Bogendoerfer
2019-01-24 17:47 ` [PATCH 1/7] MIPS: SGI-IP27: get rid of volatile and hubreg_t Thomas Bogendoerfer
2019-01-24 17:47 ` [PATCH 2/7] MIPS: SGI-IP27: clean up bridge access and header files Thomas Bogendoerfer
2019-01-28 13:20 ` Christoph Hellwig
2019-01-28 13:24 ` Thomas Bogendoerfer [this message]
2019-01-28 13:33 ` Christoph Hellwig
2019-01-24 17:47 ` [PATCH 3/7] MIPS: SGI-IP27: use pr_info/pr_emerg and pr_cont to fix output Thomas Bogendoerfer
2019-01-24 17:47 ` [PATCH 4/7] MIPS: SGI-IP27: do xtalk scanning later Thomas Bogendoerfer
2019-01-24 17:47 ` [PATCH 5/7] MIPS: SGI-IP27: rework HUB interrupts Thomas Bogendoerfer
2019-01-28 13:26 ` Christoph Hellwig
2019-01-24 17:47 ` [PATCH 6/7] MIPS: SGI-IP27: use generic PCI driver Thomas Bogendoerfer
2019-01-28 13:32 ` Christoph Hellwig
2019-01-29 15:24 ` Thomas Bogendoerfer
2019-01-30 9:17 ` Christoph Hellwig
2019-01-30 17:25 ` Thomas Bogendoerfer
2019-01-30 17:28 ` Christoph Hellwig
2019-02-18 10:58 ` Thomas Bogendoerfer
2019-02-20 15:10 ` Christoph Hellwig
2019-02-20 15:20 ` Thomas Bogendoerfer
2019-01-24 17:47 ` [PATCH 7/7] MIPS: SGI-IP27: abstract chipset irq from bridge Thomas Bogendoerfer
2019-01-28 13:33 ` Christoph Hellwig
2019-01-28 14:01 ` Thomas Bogendoerfer
2019-01-28 16:27 ` Christoph Hellwig
2019-02-01 14:37 ` Thomas Bogendoerfer
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