From: David Daney <ddaney@caviumnetworks.com>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: loody <miloody@gmail.com>,
"Maciej W. Rozycki" <macro@linux-mips.org>,
Linux MIPS Mailing List <linux-mips@linux-mips.org>
Subject: Re: some question about wmb in mips
Date: Tue, 31 Aug 2010 08:59:43 -0700 [thread overview]
Message-ID: <4C7D26EF.3040509@caviumnetworks.com> (raw)
In-Reply-To: <20100831143304.GA16268@linux-mips.org>
On 08/31/2010 07:33 AM, Ralf Baechle wrote:
> On Mon, Aug 30, 2010 at 09:58:27PM +0800, loody wrote:
>
>> after reading the DMA api document and check the source code.
>> I found mips seems not implement "dma map ops", but x86 has implemented it.
>> What are they used for and why mips don't implement it?
>
> This is useful for multiple sets of methods on more complicated systems.
> Right now we just don't need that.
>
That said, I am preparing a set of patches that converts MIPS to use
struct dma_map_ops. They turn out to be useful in systems where PCI
devices need different treatment than on-chip devices, and when bounce
buffers are needed form some devices, but not others.
David Daney
next prev parent reply other threads:[~2010-08-31 15:59 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-27 16:16 some question about wmb in mips loody
2010-06-27 17:47 ` Maciej W. Rozycki
2010-06-27 20:52 ` Ralf Baechle
[not found] ` <AANLkTim53N4t7PXiRPNqtP0G9cEjMdQY77m73MVkApH5@mail.gmail.com>
2010-08-30 13:58 ` loody
2010-08-31 14:33 ` Ralf Baechle
2010-08-31 15:59 ` David Daney [this message]
2010-06-27 20:39 ` Ralf Baechle
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