linux-kernel - Re: [PATCH 1/2] iommu: Add static iommu_ops->release

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Date: Wed, 28 Feb 2024 09:13:45 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: "Tian, Kevin" <kevin.tian@...el.com>, Joerg Roedel <joro@...tes.org>,
 Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
 Jason Gunthorpe <jgg@...pe.ca>, "Badger, Eric" <ebadger@...estorage.com>
Cc: baolu.lu@...ux.intel.com, "iommu@...ts.linux.dev"
 <iommu@...ts.linux.dev>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 Jason Gunthorpe <jgg@...dia.com>
Subject: Re: [PATCH 1/2] iommu: Add static iommu_ops->release_domain

On 2/27/24 3:32 PM, Tian, Kevin wrote:
>> From: Lu Baolu<baolu.lu@...ux.intel.com>
>> Sent: Friday, February 23, 2024 1:13 PM
>>
>>
>> +	/*
>> +	 * If the iommu driver provides release_domain then the core code
>> +	 * ensures that domain is attached prior to calling release_device.
>> +	 * Drivers can use this to enforce a translation on the idle iommu.
> 'enforce a translation' is confusing in the context of blocking/identity
> domain.

Blocking or identity domain is also kind of a translation from the
core's perspective. The core does not care what type of translation the
release_domain is; it just enforces this type of translation before
device release if the driver has specified one.

Best regards,
baolu