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Re: [Xen-devel] [LINUX] dma: Use swiotlb mask for coherent mappings too

from [Jan Beulich] [Permanent Link][Original]
To: "Keir Fraser" <keir@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [LINUX] dma: Use swiotlb mask for coherent mappings too
From: "Jan Beulich" <jbeulich@xxxxxxxxxx>
Date: Wed, 20 Dec 2006 12:38:00 +0000
Cc: Xen Development Mailing List <xen-devel@xxxxxxxxxxxxxxxxxxx>, Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>, Calvin Webster <cwebster@xxxxxxxxx>
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>>> Keir Fraser <keir@xxxxxxxxxxxxx> 20.12.06 12:55 >>>
>We could fall back to swiotlb_alloc/free_coherent?

Hmm, that would mean extra tracking, as dma_free_coherent must have a way
to tell whether to call xen_destroy_contiguous_region directly or invoke
swiotlb_free_coherent (and I wouldn't want to make io_tlb_{start,end} global).

Jan

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