linux-kernel - Re: [PATCH] x86: enable DMA CMA with swiotlb

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Message-ID: <528D4A1A.2050100@zytor.com>
Date:	Wed, 20 Nov 2013 15:47:38 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Akinobu Mita <akinobu.mita@...il.com>,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
CC:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org
Subject: Re: [PATCH] x86: enable DMA CMA with swiotlb

On 11/19/2013 03:32 PM, Akinobu Mita wrote:
> The DMA Contiguous Memory Allocator support on x86 is disabled when
> swiotlb config option is enabled.  So DMA CMA is always disabled on
> x86_64 because swiotlb is always enabled.  This attempts to support
> for DMA CMA with enabling swiotlb config option.

What is the use case?

	-hpa


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