linux-kernel - Re: [PATCH 0/4] add a helper function, is_buffer_dma

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Date:	Tue, 9 Sep 2008 18:27:05 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
CC:	mingo@...hat.com, linux-kernel@...r.kernel.org, tony.luck@...el.com
Subject: Re: [PATCH 0/4] add a helper function, is_buffer_dma_capable()

On Wed, Sep 10, 2008 at 01:06:45AM +0900, FUJITA Tomonori wrote:
> This patchset adds a trivial helper function, is_buffer_dma_capable()
> and cleans up some IOMMU implementations. This function is to to see
> if a memory region is DMA-capable or not with the arguments, the
> dma_mask (or coherent_dma_mask) of a device and the address and size
> of a memory region. It's useful for IOMMUs that don't do virtual
> mappings at all times.
> 
> The patch for swiotlb is a bug fix (the rest are just
> cleanups). Currently, swiotlb doesn't take account of the size of a
> memory region to see if if the memory region is DMA-capable.

Good idea. This patchset increases the readability of the software
dma-api implementations.

Acked-by: Joerg Roedel <joerg.roedel@....com>

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