linux-kernel - Re: CMA region absolutely for a particular device?

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Message-ID: <CAJBJ56LGyYyqfSFjXDHzO0M_ouFB35Mkj5N14V7J-gz--tSqmw@mail.gmail.com>
Date:	Wed, 8 Jun 2016 19:04:06 +0800
From:	Shawn Guo <shawnguo@...nel.org>
To:	Laura Abbott <labbott@...hat.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	inux-arm-kernel@...ts.infradead.org,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: CMA region absolutely for a particular device?

On Tue, Jun 7, 2016 at 11:55 PM, Laura Abbott <labbott@...hat.com> wrote:
> You could try backporting the ZONE_CMA patches
> http://article.gmane.org/gmane.linux.kernel.mm/152016 . The primary problem
> there was CMA utilization but there was some discussion about migration
> success as well http://article.gmane.org/gmane.linux.kernel/2228789

Thanks much for the pointers, Laura.

> If that doesn't work for you, I think the 'reusable' property can be dropped
> and it should just become a DMA coherent pool. I haven't tested this though.

I will see if I can test it out.

Shawn