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Date:   Wed, 13 Nov 2019 10:53:53 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Lu Baolu <baolu.lu@linux.intel.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        David Woodhouse <dwmw2@infradead.org>,
        Joerg Roedel <joro@8bytes.org>,
        Bjorn Helgaas <bhelgaas@google.com>, ashok.raj@intel.com,
        jacob.jun.pan@intel.com, alan.cox@intel.com, kevin.tian@intel.com,
        mika.westerberg@linux.intel.com, Ingo Molnar <mingo@redhat.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        pengfei.xu@intel.com,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Marek Szyprowski <m.szyprowski@samsung.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Boris Ostrovsky <boris.ostrovsky@oracle.com>,
        Juergen Gross <jgross@suse.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
        Jacob Pan <jacob.jun.pan@linux.intel.com>
Subject: Re: [PATCH v5 02/10] iommu/vt-d: Use per-device dma_ops
Message-ID: <20191113095353.GA5937@lst.de>
References: <20190725031717.32317-1-baolu.lu@linux.intel.com> <20190725031717.32317-3-baolu.lu@linux.intel.com> <20190725054413.GC24527@lst.de> <bc831f88-5b19-7531-00aa-a7577dd5c1ac@linux.intel.com> <20190725114348.GA30957@lst.de> <a098359a-0f89-6028-68df-9f83718df256@linux.intel.com> <20191112071640.GA3343@lst.de> <0885617e-8390-6d18-987f-40d49f9f563e@linux.intel.com> <20191113070312.GA2735@lst.de>
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On Wed, Nov 13, 2019 at 08:03:12AM +0100, Christoph Hellwig wrote:
> Indeed.  And one idea would be to lift the code in the powerpc
> dma_iommu_ops that check a flag and use the direct ops to the generic
> dma code and a flag in struct device.  We can then switch the intel
> iommu ops (and AMD Gart) over to it.

Let me know what you think of the branch below.  Only compile tested
and booted on qemu with an emulated intel iommu:

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