linux-kernel - Re: [PATCH -mm 0/11] fix iommu sg merging problem

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Date:	Wed, 24 Oct 2007 15:24:34 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	FUJITA Tomonori <tomof@....org>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, James.Bottomley@...elEye.com,
	greg@...ah.com, jeff@...zik.org, muli@...ibm.com, paulus@...ba.org,
	tony.luck@...el.com, davem@...emloft.net, kyle@...isc-linux.org,
	aacraid@...ptec.com, fujita.tomonori@....ntt.co.jp
Subject: Re: [PATCH -mm 0/11] fix iommu sg merging problem

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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