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Message-ID: <777eb770-7db2-0cb8-876e-67d86abffa42@linux.intel.com>
Date: Tue, 29 Nov 2022 10:15:03 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: Jason Gunthorpe <jgg@...dia.com>
Cc: baolu.lu@...ux.intel.com, 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>,
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Hector Martin <marcan@...can.st>,
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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 11/28/22 10:11 PM, Jason Gunthorpe wrote:
> 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.
Done. Thank you!
Best regards,
baolu
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