linux-kernel - RE: [PATCH v8 07/10] iommu/vt-d: Allow qi_submit

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Message-ID: <BN9PR11MB5276429906ED56258BB433068C9EA@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Thu, 28 Dec 2023 06:17:19 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: "Liu, Yi L" <yi.l.liu@...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"
	<mjrosato@...ux.ibm.com>, "chao.p.peng@...ux.intel.com"
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	"suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
	"iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
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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 v8 07/10] iommu/vt-d: Allow qi_submit_sync() to return the
 QI faults

> From: Liu, Yi L <yi.l.liu@...el.com>
> Sent: Thursday, December 28, 2023 12:14 AM
> 
> @@ -1376,6 +1383,8 @@ int qi_submit_sync(struct intel_iommu *iommu,
> struct qi_desc *desc,
> 
>  restart:
>  	rc = 0;
> +	if (fault)
> +		*fault = 0;

move it to right before the loop of qi_check_fault()

> 
>  	raw_spin_lock_irqsave(&qi->q_lock, flags);
>  	/*
> @@ -1430,7 +1439,7 @@ int qi_submit_sync(struct intel_iommu *iommu,
> struct qi_desc *desc,
>  		 * a deadlock where the interrupt context can wait
> indefinitely
>  		 * for free slots in the queue.
>  		 */
> -		rc = qi_check_fault(iommu, index, wait_index);
> +		rc = qi_check_fault(iommu, index, wait_index, fault);
>  		if (rc)
>  			break;

and as replied in another thread let's change qi_check_fault to return
-ETIMEDOUT to break the restart loop when fault pointer is valid.