Re: [PATCH v9 07/10] iommu/vt-d: Allow qi_submit_sync() to return the QI faults

[Yi Liu <yi.l.liu@intel.com>]

On 2023/12/29 10:52, Tian, Kevin wrote:
>> From: Liu, Yi L <yi.l.liu@intel.com>
>> Sent: Thursday, December 28, 2023 11:06 PM
>>
>> From: Lu Baolu <baolu.lu@linux.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@intel.com>

sure.

-- 
Regards,
Yi Liu