linux-kernel - [PATCH 0/2] dma,x86,xen: fix dma_get_required

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Date:	Mon, 12 May 2014 11:15:40 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	<linux-kernel@...r.kernel.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, <x86@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	<xen-devel@...ts.xenproject.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	David Vrabel <david.vrabel@...rix.com>
Subject: [PATCH 0/2] dma,x86,xen: fix dma_get_required_mask() when dma != phys address

x86 uses the generic dma_get_required_mask() which assumes that DMA
address == physical address.  For Xen PV guests this is not the case
and certain drivers will cause excessive use of the SWIOTLB.

Patch #1 is a straight forward refactoring of a common function.

Patch #2 addes the required arch-specific implementation of
dma_get_required_mask() to x86.

David

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