linux-kernel - RE: [PATCH v2 07/12] iommu/vt-d: Put iopf enablement in domain attach path

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Message-ID: <BN9PR11MB527621531383D5AA5824D3358CC32@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Tue, 25 Feb 2025 08:02:26 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>, "Will
 Deacon" <will@...nel.org>, Robin Murphy <robin.murphy@....com>, "Jason
 Gunthorpe" <jgg@...pe.ca>
CC: "Jiang, Dave" <dave.jiang@...el.com>, Vinod Koul <vkoul@...nel.org>,
	Fenghua Yu <fenghuay@...dia.com>, Zhangfei Gao <zhangfei.gao@...aro.org>,
	Zhou Wang <wangzhou1@...ilicon.com>, "iommu@...ts.linux.dev"
	<iommu@...ts.linux.dev>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 07/12] iommu/vt-d: Put iopf enablement in domain attach
 path

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Monday, February 24, 2025 1:16 PM
> 
> Update iopf enablement in the driver to use the new method, similar to
> the arm-smmu-v3 driver. Enable iopf support when any domain with an
> iopf_handler is attached, and disable it when the domain is removed.
> 
> Place all the logic for controlling the PRI and iopf queue in the domain
> set/remove/replace paths. Keep track of the number of domains set to the
> device and PASIDs that require iopf. When the first domain requiring iopf
> is attached, add the device to the iopf queue and enable PRI. When the
> last domain is removed, remove it from the iopf queue and disable PRI.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>