linux-kernel - Re: generic DMA bypass flag

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Message-ID: <20191116062258.GA8913@lst.de>
Date:   Sat, 16 Nov 2019 07:22:58 +0100
From:   Christoph Hellwig <hch@....de>
To:     Robin Murphy <robin.murphy@....com>
Cc:     Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org,
        Alexey Kardashevskiy <aik@...abs.ru>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: generic DMA bypass flag

On Fri, Nov 15, 2019 at 06:12:48PM +0000, Robin Murphy wrote:
> And is that any different from where you would choose to "just" set a 
> generic bypass flag?

Same spots, as intel-iommu moves from the identify to a dma domain when
setting a 32-bit mask.  But that means once a 32-bit mask is set we can't
ever go back to the 64-bit one.  And we had a couple drivers playing
interesting games there.  FYI, this is the current intel-iommu
WIP conversion to the dma bypass flag:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/dma-bypass