linux-kernel - Re: [PATCH v2 RFC 7/8] swiotlb-xen: support autotranslate guests

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Message-ID: <51FA5262.6090604@citrix.com>
Date:	Thu, 1 Aug 2013 13:19:46 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	<xen-devel@...ts.xensource.com>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <konrad.wilk@...cle.com>,
	<Ian.Campbell@...rix.com>
Subject: Re: [PATCH v2 RFC 7/8] swiotlb-xen: support autotranslate guests

On 31/07/13 20:54, Stefano Stabellini wrote:
> Support autotranslate guests in swiotlb-xen by keeping track of the
> phys-to-bus and bus-to-phys mappings of the swiotlb buffer
> (xen_io_tlb_start-xen_io_tlb_end).
> 
> Use a simple direct access on a pre-allocated array for phys-to-bus
> queries. Use a red-black tree for bus-to-phys queries.

It would be nice if the dma_map_page() etc. returned a unique handle in
addition to the dma_addr_t so the lookup on unmap could be cheaper, but
in the absence of this.

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

David
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