linux-kernel - Re: Where do we stand with the Xen patches?

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Message-Id: <1242902913.22654.146.camel@zakaz.uk.xensource.com>
Date:	Thu, 21 May 2009 11:48:33 +0100
From:	Ian Campbell <ijc@...lion.org.uk>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	jeremy@...p.org, mingo@...e.hu, x86@...nel.org,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	gregkh@...e.de, okir@...e.de, beckyb@...nel.crashing.org
Subject: Re: Where do we stand with the Xen patches?

On Thu, 2009-05-21 at 17:54 +0900, FUJITA Tomonori wrote:
> @@ -819,8 +796,8 @@ swiotlb_map_sg_attrs(struct device *hwdev, struct scatterlist *sgl, int nelems,
>                 phys_addr_t paddr = sg_phys(sg);
>                 dma_addr_t dev_addr = swiotlb_phys_to_bus(hwdev, paddr);
>  
> -               if (range_needs_mapping(paddr, sg->length) ||
> -                   address_needs_mapping(hwdev, dev_addr, sg->length)) {
> +               if (!is_buffer_dma_capable(hwdev, dma_get_mask(hwdev), paddr, sg->length) ||
> +                   swiotlb_force) {
>                         void *map = map_single(hwdev, sg_phys(sg),
>                                                sg->length, dir);
>                         if (!map) {

BTW I think there was a typo here, dev_addr becomes paddr. I fixed that
in my updated version.

Ian.
-- 
Ian Campbell
Current Noise: Isis - In Fiction

Poorochrondria:
	Hypochrondria derived from not having medical insurance.
		-- Douglas Coupland, "Generation X: Tales for an Accelerated
		   Culture"

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