linux-kernel - Re: [PATCH v4 4/6] arm64/dma-mapping: Implement DMA_ATTR

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Date:	Wed, 27 Jul 2016 16:39:39 -0700
From:	Mitchel Humpherys <mitchelh@...eaurora.org>
To:	Robin Murphy <robin.murphy@....com>
Cc:	Joerg Roedel <joro@...tes.org>, iommu@...ts.linux-foundation.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Will Deacon <will.deacon@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Jordan Crouse <jcrouse@...eaurora.org>,
	Jeremy Gebben <jgebben@...eaurora.org>,
	Patrick Daly <pdaly@...eaurora.org>,
	Pratik Patel <pratikp@...eaurora.org>,
	Thomas Zeng <tzeng@...eaurora.org>
Subject: Re: [PATCH v4 4/6] arm64/dma-mapping: Implement DMA_ATTR_PRIVILEGED

On Tue, Jul 26 2016 at 04:05:17 PM, Robin Murphy <robin.murphy@....com> wrote:
> +	if (attrs & DMA_ATTR_PRIVILEGED)
> +		prot |= IOMMU_PRIV;
> +
>
> then drop the rest of the changes to the switch statement below. It's
> taken me an embarrassingly long time to work out why things were blowing
> up in __iommu_sync_single_for_device() all with a VA of phys_to_virt(0) ;)

Ah yes, that is much nicer!  Nice catch...

> With that change, for the whole series:
>
> Reviewed-by: Robin Murphy <robin.murphy@....com>
> Tested-by: Robin Murphy <robin.murphy@....com>
>
> I guess at this point it may be worth waiting to repost based on -rc1.
> Be sure to CC patch 5 to Vinod as the current dmaengine maintainer, as
> it's his ack we'll need on that.

Thanks for the review and test.  I'll go ahead and send a v5 series
since I'm actually leaving QuIC this Friday and so I won't be around to
send it next week...


-Mitch

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