From: Trent Piepho <tpiepho@freescale.com>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev <linuxppc-dev@ozlabs.org>,
"maillist.kernel" <maillist.kernel@gmail.com>
Subject: Re: How to support 3GB pci address?
Date: Thu, 11 Dec 2008 20:07:06 -0800 (PST) [thread overview]
Message-ID: <Pine.LNX.4.64.0812111957470.28806@t2.domain.actdsltmp> (raw)
In-Reply-To: <41706FC0-B740-42C0-BA2B-B9E4B5839477@kernel.crashing.org>
On Thu, 11 Dec 2008, Kumar Gala wrote:
> On Dec 11, 2008, at 6:04 AM, maillist.kernel wrote:
>> In the system, the total PCI address needed is about 3GB, so I want to know
>> how to support it in linux. mpc8548 has 36-bit real address, and can
>> support 32GB PCIE address space, but in linux, there is only 1GB kernel
>> space, how to map the 3GB pci address to kernel? Is the 36-bit real
>> address only used to support large memory(>4GB) for muti-threads?
>
> The 36-bit support is current (in tree) in complete. Work is in progress to
> add swiotlb support to PPC which will generically enable what you want to
> accomplish.
Don't the ATMU windows in the pcie controller serve as a IOMMU, making swiotlb
unnecessary and wasteful?
next prev parent reply other threads:[~2008-12-12 4:07 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-11 12:04 How to support 3GB pci address? maillist.kernel
2008-12-11 16:13 ` Kumar Gala
2008-12-12 4:07 ` Trent Piepho [this message]
2008-12-12 5:08 ` Kumar Gala
2008-12-12 9:04 ` Trent Piepho
2008-12-12 14:17 ` Kumar Gala
2008-12-12 17:13 ` Scott Wood
2008-12-12 20:34 ` Trent Piepho
2008-12-13 4:56 ` maillist.kernel
2008-12-13 22:11 ` Trent Piepho
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