linux-kernel - Re: [PATCH] dma-direct: Export dma_direct_alloc() and dma_direct

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Date:   Tue, 5 Feb 2019 23:29:12 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] dma-direct: Export dma_direct_alloc() and
 dma_direct_free()

On Tue, Feb 05, 2019 at 07:02:18PM +0100, Christoph Hellwig wrote:
> On Tue, Feb 05, 2019 at 06:56:11PM +0100, Thierry Reding wrote:
> > Sure, here you go:
> > 
> > 	https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/gpu/host1x/cdma.c#n106
> 
> Yes, I think we I can come up with a nicer helper for that.

One thing I could also try is to remove direct IOMMU API usage at least
from the host1x driver. I think this might work nowadays.

For Tegra DRM we still need direct IOMMU API usage because we need to be
able to map into an IOMMU domain without knowing the struct device *
that we're mapping for (it could be needed by any of up to four display
controllers). For host1x we always only have one struct device *, so the
DMA mapping API should be good enough.

Thierry

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