linux-kernel - Re: [PATCH 5/6] swiotlb: Make swiotlb bookkeeping functions visible in the header file.

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Date:	Sun, 9 May 2010 22:41:26 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	konrad.wilk@...cle.com
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, albert_herranz@...oo.es,
	linux@...elenboom.it, chrisw@...s-sol.org,
	Ian.Campbell@...citrix.com, jeremy@...p.org, dwmw2@...radead.org,
	alex.williamson@...com
Subject: Re: [PATCH 5/6] swiotlb: Make swiotlb bookkeeping functions
 visible in the header file.

On Wed,  7 Apr 2010 16:29:29 -0400
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:

> We put the init, free, and functions dealing with the operations on
> the SWIOTLB buffer at the top of the header. Also we export some of the
> variables that are used by the dma_ops functions.
> 
> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
>  include/linux/swiotlb.h |   33 +++++++++++++++++++++++++++++++++
>  lib/swiotlb.c           |   42 ++++++++++++++++++++----------------------
>  2 files changed, 53 insertions(+), 22 deletions(-)


> +extern void swiotlb_full(struct device *dev, size_t size,
> +			 enum dma_data_direction dir, int do_panic);
> +

Please don't. You create a new IOMMU implementation with the helper
function. We don't want another IOMMU implementation that has broken
'overflow buffer' concept.

swiotlb-xen should handle DMA mapping errors properly instead of
calling swiotlb_full().

btw, if you try to push xen swiotlb stuff to mainline, please don't
put xen swiotlb stuff to include/linux/swiotlb.h.
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