From: Kumar Gala <galak@kernel.crashing.org>
To: Timur Tabi <timur.tabi@gmail.com>
Cc: dan.j.williams@intel.com, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] fsldma: add support to 36-bit physical address
Date: Mon, 15 Nov 2010 09:16:57 -0600 [thread overview]
Message-ID: <3B38AD35-39A2-4A54-8109-65D6DE436227@kernel.crashing.org> (raw)
In-Reply-To: <AANLkTi=1nutREorMFY2VJyUYQD0SHfiSeskw-u22P+R-@mail.gmail.com>
On Nov 13, 2010, at 4:43 PM, Timur Tabi wrote:
> On Thu, Nov 11, 2010 at 5:56 AM, Kumar Gala =
<galak@kernel.crashing.org> wrote:
>=20
>> Is there any reason we shouldn't set DMA_BIT_MASK(64) since the DMA =
block programming model allows the address to be 64-bits?
>=20
> Can you explain that? The DMA registers only have room for 36 bits
> for the physical address.
The programming model (if you look at the free-space in the registers =
and data structures) supports a 64-bit address. I'm trying to avoid =
changing the driver in the future if we have >36-bit. However this is =
such a minor worry that I'll stop and just ack the patch as is.
- k=
next prev parent reply other threads:[~2010-11-15 15:17 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-11 12:16 [PATCH v2] fsldma: add support to 36-bit physical address Li Yang
2010-11-11 11:56 ` Kumar Gala
2010-11-12 3:16 ` Li Yang-R58472
2010-11-13 22:43 ` Timur Tabi
2010-11-15 15:16 ` Kumar Gala [this message]
2010-11-15 16:13 ` Timur Tabi
2010-11-15 17:43 ` Kumar Gala
2010-11-15 17:53 ` Scott Wood
2010-11-15 15:17 ` Kumar Gala
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