linux-kernel - Re: [PATCH v5 01/14] iommu: Add dma ownership management interfaces

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Date:   Thu, 6 Jan 2022 11:47:50 +0800
From:   Lu Baolu <baolu.lu@...ux.intel.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Christoph Hellwig <hch@...radead.org>
Cc:     baolu.lu@...ux.intel.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Joerg Roedel <joro@...tes.org>,
        Alex Williamson <alex.williamson@...hat.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Ashok Raj <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Dan Williams <dan.j.williams@...el.com>, rafael@...nel.org,
        Diana Craciun <diana.craciun@....nxp.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Eric Auger <eric.auger@...hat.com>,
        Liu Yi L <yi.l.liu@...el.com>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Li Yang <leoyang.li@....com>,
        Dmitry Osipenko <digetx@...il.com>,
        iommu@...ts.linux-foundation.org, linux-pci@...r.kernel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 01/14] iommu: Add dma ownership management interfaces

On 1/5/22 12:41 AM, Bjorn Helgaas wrote:
>>> Devices under kernel drivers control must call iommu_device_use_dma_api()
>>> before driver probes. The driver binding process must be aborted if it
>>> returns failure.
> "Devices" don't call functions.  Drivers do, or in this case, it looks
> like the bus DMA code (platform, amba, fsl, pci, etc).
> 
> These functions are EXPORT_SYMBOL_GPL(), but it looks like all the
> callers are built-in, so maybe the export is unnecessary?

Yes. If all callers are built-in, we can remove this export.

> 
> You use "iommu"/"IOMMU" and "dma"/"DMA" interchangeably above.  Would
> be easier to read if you picked one.
> 

I should cleanup all these. I also realized that I forgot to
cleanup some typos you pointed out in v4:

https://lore.kernel.org/linux-iommu/20211229211626.GA1701512@bhelgaas/

Sorry about it. I will take care of all these in the next version.

Best regards,
baolu