linux-kernel - Re: [PATCH v5 3/9] iommu: Add attachment handle to struct iopf

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Date: Sun, 19 May 2024 22:03:43 +0800
From: Baolu Lu <baolu.lu@...ux.intel.com>
To: "Tian, Kevin" <kevin.tian@...el.com>, Jason Gunthorpe <jgg@...pe.ca>,
 Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
 Robin Murphy <robin.murphy@....com>,
 Jean-Philippe Brucker <jean-philippe@...aro.org>,
 Nicolin Chen <nicolinc@...dia.com>, "Liu, Yi L" <yi.l.liu@...el.com>,
 Jacob Pan <jacob.jun.pan@...ux.intel.com>,
 Joel Granados <j.granados@...sung.com>
Cc: baolu.lu@...ux.intel.com, "iommu@...ts.linux.dev"
 <iommu@...ts.linux.dev>,
 "virtualization@...ts.linux-foundation.org"
 <virtualization@...ts.linux-foundation.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 3/9] iommu: Add attachment handle to struct iopf_group

On 2024/5/15 15:31, Tian, Kevin wrote:
>> From: Lu Baolu <baolu.lu@...ux.intel.com>
>> Sent: Tuesday, April 30, 2024 10:57 PM
>>
>> Previously, the domain that a page fault targets is stored in an
>> iopf_group, which represents a minimal set of page faults. With the
>> introduction of attachment handle, replace the domain with the handle
> 
> It's better to use 'attach handle' as the code does.

Done.

> 
>> +	handle = iommu_attach_handle_get(dev->iommu_group, pasid, 0);
>> +	if (IS_ERR(handle))
>> +		return PTR_ERR(handle);
>>
>> -	if (!domain || !domain->iopf_handler) {
>> -		dev_warn_ratelimited(dev,
>> -			"iopf (pasid %d) without domain attached or handler
>> installed\n",
>> -			 fault->prm.pasid);
>> +	group->attach_handle = handle;
>> +	group->domain = handle->domain;
> 
> this change also removes the warning message. Is it desired?

Not desired.

Perhaps we can add a message when the iopf handling is aborted.
Something like below:

err_abort:
+        dev_warn_ratelimited(dev, "iopf with pasid %d aborted\n",
+                             fault->prm.pasid);
         iopf_group_response(group, IOMMU_PAGE_RESP_FAILURE);

Though I am not sure which is better dev_warn() or dev_info().

Best regards,
baolu