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Date: Mon, 28 Nov 2022 10:11:42 -0400 From: Jason Gunthorpe <jgg@...dia.com> To: Lu Baolu <baolu.lu@...ux.intel.com> Cc: Joerg Roedel <joro@...tes.org>, Christoph Hellwig <hch@...radead.org>, Kevin Tian <kevin.tian@...el.com>, Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>, Jean-Philippe Brucker <jean-philippe@...aro.org>, Suravee Suthikulpanit <suravee.suthikulpanit@....com>, Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>, Rob Clark <robdclark@...il.com>, Marek Szyprowski <m.szyprowski@...sung.com>, Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>, Andy Gross <agross@...nel.org>, Bjorn Andersson <andersson@...nel.org>, Yong Wu <yong.wu@...iatek.com>, Matthias Brugger <matthias.bgg@...il.com>, Heiko Stuebner <heiko@...ech.de>, Matthew Rosato <mjrosato@...ux.ibm.com>, Orson Zhai <orsonzhai@...il.com>, Baolin Wang <baolin.wang@...ux.alibaba.com>, Chunyan Zhang <zhang.lyra@...il.com>, Chen-Yu Tsai <wens@...e.org>, Thierry Reding <thierry.reding@...il.com>, iommu@...ts.linux.dev, linux-kernel@...r.kernel.org Subject: Re: [PATCH v3 10/20] iommu: Add set_platform_dma iommu ops On Mon, Nov 28, 2022 at 02:46:38PM +0800, Lu Baolu wrote: > When VFIO finishes assigning a device to user space and calls > iommu_group_release_dma_owner() to return the device to kernel, the IOMMU > core will attach the default domain to the device. Unfortunately, some > IOMMU drivers don't support default domain, hence in the end, the core > calls .detach_dev instead. > > This adds set_platform_dma iommu ops to make it clear that what it does > is returning control back to the platform DMA ops. > > Suggested-by: Jason Gunthorpe <jgg@...dia.com> > Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com> > --- > include/linux/iommu.h | 4 ++++ > 1 file changed, 4 insertions(+) Reviewed-by: Jason Gunthorpe <jgg@...dia.com> > + * @set_platform_dma: Returning control back to the platform DMA ops. Only > + * valid for IOMMU drivers which don't support default > + * domain. I would add: This op is to support old IOMMU drivers, new drivers should use default domains, and the common IOMMU DMA ops. Jason
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