linux-kernel - Re: [PATCH v9 07/10] iommu/vt-d: Allow qi_submit

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Date: Fri, 29 Dec 2023 14:37:15 +0800
From: Yi Liu <yi.l.liu@...el.com>
To: "Tian, Kevin" <kevin.tian@...el.com>, "joro@...tes.org" <joro@...tes.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>, "jgg@...dia.com"
	<jgg@...dia.com>, "robin.murphy@....com" <robin.murphy@....com>,
	"baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>
CC: "cohuck@...hat.com" <cohuck@...hat.com>, "eric.auger@...hat.com"
	<eric.auger@...hat.com>, "nicolinc@...dia.com" <nicolinc@...dia.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "mjrosato@...ux.ibm.com"
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 Zhenzhong" <zhenzhong.duan@...el.com>, "joao.m.martins@...cle.com"
	<joao.m.martins@...cle.com>, "Zeng, Xin" <xin.zeng@...el.com>, "Zhao, Yan Y"
	<yan.y.zhao@...el.com>, "j.granados@...sung.com" <j.granados@...sung.com>
Subject: Re: [PATCH v9 07/10] iommu/vt-d: Allow qi_submit_sync() to return the
 QI faults

On 2023/12/29 10:52, Tian, Kevin wrote:
>> From: Liu, Yi L <yi.l.liu@...el.com>
>> Sent: Thursday, December 28, 2023 11:06 PM
>>
>> From: Lu Baolu <baolu.lu@...ux.intel.com>
>>
>> This allows qi_submit_sync() to return back faults to callers.
> 
> this might be useful to add a note that the retry logic itself is being discussed
> in a separate thread [1]. Here we keep it intact and just make sure no retry for
> the newly added user domain cache invalidation.
> 
> [1] https://lore.kernel.org/all/20231228001646.587653-6-haifeng.zhao@linux.intel.com/
> 
>>
>> -		if (qi->desc_status[wait_index] == QI_ABORT)
>> +		if (qi->desc_status[wait_index] == QI_ABORT) {
>> +			/*
>> +			 * If the caller is interested in the error, no need
>> +			 * to retry, just return the time out error to the
>> +			 * caller.
>> +			 */
>> +			if (fsts)
>> +				return -ETIMEDOUT;
>> +		}
>>   			return -EAGAIN;
> 
> indent should be adjusted and it changes the original logic which returns
> -EAGAIN only if QI_ABORT is set for the wait_index.

oops. this is a mistake. :) '}' should be after 'return -EAGAIN'

> the simpler form is:
> 
> 		/* No need to retry if the caller is interested in the timeout error */
> 		if (qi->desc_status[wait_index] == QI_ABORT)
> 			return fsts ? -ETIMEDOUT : -EAGAIN;
> 
> otherwise,
> 
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>

sure.

-- 
Regards,
Yi Liu