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

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Message-ID: <528F71F8.4070902@zytor.com>
Date:	Fri, 22 Nov 2013 07:02:16 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Akinobu Mita <akinobu.mita@...il.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	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 11/22/2013 04:27 AM, Akinobu Mita wrote:
> 
> I'm currently working for integrating DMA CMA with intel-iommu which
> I can test.  Regardless of which dma ops is actually used, I would
> like to allocate large contiguous memory with dma_alloc_coherent()
> and tell the base address to the device.
> 
> We can use mem= or crashkernel= to reserve host memory, but it is
> complicated and unables to work with real IOMMU.
> 

If you have a real iotlb, why would you need contiguous memory?

	-hpa

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