linux-kernel - Re: [PATCH 2/5] iommu: Call helper function to get assigned pasid value

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Message-ID: <c0e94e88-94b8-69de-69c8-ed132ae28951@linux.intel.com>
Date:   Wed, 9 Aug 2023 18:58:15 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.com>,
        "Zhang, Tina" <tina.zhang@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Michael Shavit <mshavit@...gle.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>
Subject: Re: [PATCH 2/5] iommu: Call helper function to get assigned pasid
 value

On 2023/8/9 17:49, Tian, Kevin wrote:
>> From: Baolu Lu <baolu.lu@...ux.intel.com>
>> Sent: Wednesday, August 9, 2023 8:22 AM
>>
>> On 2023/8/8 15:49, Tina Zhang wrote:
>>> Use the helper function mm_get_pasid() to get the mm assigned pasid
>>> value.
>>
>> For internal iommu drivers, perhaps we should use another helper.
>> Something like sva_domain_get_pasid()?
>>
>> Suppose that the iommu drivers should have no idea about the "mm".
>>
> 
> Aren't all touched functions accept a struct mm_struct pointer?

In the end we should remove all mm reference in the individual drivers.
The drivers only need to know what they need to know. All mm-aware code
should eventually be moved to the core.

For now, at least we should avoid using mm in the set/remove_dev_pasid
code path. Later, once we complete consolidating mm notification in the
core, drivers will have no need to use "mm" anymore.

Best regards,
baolu