linux-kernel - RE: [PATCH 8/8] WIP: add a dma_alloc

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Message-ID: <74c9662fca5a4d5896220a64aa9ad3ec@AcuMS.aculab.com>
Date:   Wed, 14 Oct 2020 15:03:31 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Tomasz Figa' <tfiga@...omium.org>, Christoph Hellwig <hch@....de>
CC:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg 
        Roedel <joro@...tes.org>," <iommu@...ts.linux-foundation.org>,
        Robin Murphy <robin.murphy@....com>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        "ribalda@...omium.org" <ribalda@...omium.org>
Subject: RE: [PATCH 8/8] WIP: add a dma_alloc_contiguous API

> On Wed, Sep 30, 2020 at 6:09 PM Christoph Hellwig <hch@....de> wrote:
> >
> > Add a new API that returns a virtually non-contigous array of pages
> > and dma address.  This API is only implemented for dma-iommu and will
> > not be implemented for non-iommu DMA API instances that have to allocate
> > contiguous memory.  It is up to the caller to check if the API is
> > available.

Isn't there already a flag that is only implemented for ARM
systems with iommu that forces pages to actually be physically
contiguous?

So isn't this some kind of strange opposite?

	David

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