Date: Wed, 24 Oct 2007 15:24:34 +0200
From: Jens Axboe <jens.axboe@oracle.com>
To: FUJITA Tomonori <tomof@acm.org>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
       linux-scsi@vger.kernel.org, James.Bottomley@SteelEye.com,
       greg@kroah.com, jeff@garzik.org, muli@il.ibm.com, paulus@samba.org,
       tony.luck@intel.com, davem@davemloft.net, kyle@parisc-linux.org,
       aacraid@adaptec.com, fujita.tomonori@lab.ntt.co.jp
Subject: Re: [PATCH -mm 0/11] fix iommu sg merging problem
Message-ID: <20071024132434.GZ14671@kernel.dk>
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On Wed, Oct 24 2007, FUJITA Tomonori wrote:
> IOMMUs merges scatter/gather segments without considering a low level
> driver's restrictions. The problem is that IOMMUs can't access to the
> limitations because they are in request_queue.
> 
> This patchset introduces a new structure, device_dma_parameters,
> including dma information. A pointer to device_dma_parameters is added
> to struct device. The bus specific structures (like pci_dev) includes
> device_dma_parameters. Low level drivers can use dma_set_max_seg_size
> to tell IOMMUs about the restrictions.
> 
> We can move more dma stuff in struct device (like dma_mask) to struct
> device_dma_parameters later (needs some cleanups before that).
> 
> This includes patches for all the IOMMUs that could merge sg (x86_64,
> ppc, IA64, alpha, sparc64, and parisc) though only the ppc patch was
> tested. The patches for other IOMMUs are only compile tested.
> 
> Thanks to everyone for the comments on the previous submission
> to linux-scsi.
> 
> This is against 2.6.24-rc1. The same patchset is also available:

Looks good to me, I think we should get this included sooner rather than
later.

-- 
Jens Axboe

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