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

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Date: Wed, 28 Feb 2024 11:30:02 +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 2/28/24 11:08 AM, Tian, Kevin wrote:
>> From: Baolu Lu <baolu.lu@...ux.intel.com>
>> Sent: Wednesday, February 28, 2024 9:14 AM
>>
>> 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.
>>
> 
> OK.
> 
> btw you may also want to update the following comment together:
> 
> 	/*
> 	 * release_device() must stop using any attached domain on the device.
> 	 * If there are still other devices in the group they are not effected
> 	 * by this callback.
> 	 *
> 	 * The IOMMU driver must set the device to either an identity or
> 	 * blocking translation and stop using any domain pointer, as it is
> 	 * going to be freed.
> 	 */
> 
> all the purpose is to set the device to identity or blocking, either via attaching
> to an explicit release_domain or implicitly by release_device().

Done.

Best regards,
baolu