linux-kernel - Re: [PATCH v2 RFC/RFT] dma-contiguous: Get normal pages for single-page allocations

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Message-ID: <20190322200925.GA22219@Asurada-Nvidia>
Date:   Fri, 22 Mar 2019 13:09:26 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Catalin Marinas <catalin.marinas@....com>
Cc:     hch@....de, robin.murphy@....com, vdumpa@...dia.com,
        will.deacon@....com, chris@...kel.net, jcmvbkbc@...il.com,
        joro@...tes.org, dwmw2@...radead.org, m.szyprowski@...sung.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-xtensa@...ux-xtensa.org, iommu@...ts.linux-foundation.org,
        jonathanh@...dia.com
Subject: Re: [PATCH v2 RFC/RFT] dma-contiguous: Get normal pages for
 single-page allocations

Hi Catalin,

On Fri, Mar 22, 2019 at 10:57:13AM +0000, Catalin Marinas wrote:
> > > Do you have any numbers to back this up? You don't seem to address
> > > dma_direct_alloc() either but, as I said above, it's not trivial since
> > > some platforms expect certain physical range for DMA allocations.
> > 
> > What's the dma_direct_alloc() here about? Mind elaborating?
> 
> I just did a grep for dma_alloc_from_contiguous() in the 5.1-rc1 kernel
> and came up with __dma_direct_alloc_pages(). Should your patch cover
> this as well?

I don't get the meaning of "cover this" here. What missing part
do you refer to?