linux-kernel - Re: [PATCH] dma-pool: Do not allocate pool memory from CMA

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Date:   Tue, 21 Jul 2020 13:37:11 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     Christoph Hellwig <hch@....de>,
        Amit Pundir <amit.pundir@...aro.org>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        David Rientjes <rientjes@...gle.com>,
        linux-rpi-kernel@...ts.infradead.org, jeremy.linton@....com,
        iommu@...ts.linux-foundation.org,
        lkml <linux-kernel@...r.kernel.org>,
        John Stultz <john.stultz@...aro.org>,
        Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH] dma-pool: Do not allocate pool memory from CMA

On Tue, 2020-07-21 at 13:28 +0200, Christoph Hellwig wrote:
> On Tue, Jul 21, 2020 at 01:15:23PM +0200, Nicolas Saenz Julienne
> wrote:
> > I'm at loss at what could be failing here. Your device should be
> > able
> > to address the whole 8GB memory space, which AFAIK is the max
> > available
> > on that smartphone family. But maybe the device-tree is lying, who
> > knows...
> 
> Maybe we should give your patch to allocate from CMA but check the
> address a try?  (just because we can..)

Yes, good idea!

Amir, could you also test this patch[1] (having reverted the one that
casues trouble) and report on whether it boots or not?

Regards,
Nicolas

[1] https://lore.kernel.org/linux-iomhttps://lore.kernel.org/linux-iom
mu/fe14037b02fd887a73cd91c115dccc4485f8446e.camel@...e.de/T/#t