linux-kernel - Re: [PATCH v2 10/19] iommufd/viommu: Add vdev

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Message-ID: <20241007153837.GT1365916@nvidia.com>
Date: Mon, 7 Oct 2024 12:38:37 -0300
From: Jason Gunthorpe <jgg@...dia.com>
To: Nicolin Chen <nicolinc@...dia.com>
Cc: kevin.tian@...el.com, will@...nel.org, joro@...tes.org,
	suravee.suthikulpanit@....com, robin.murphy@....com,
	dwmw2@...radead.org, baolu.lu@...ux.intel.com, shuah@...nel.org,
	linux-kernel@...r.kernel.org, iommu@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org,
	linux-kselftest@...r.kernel.org, eric.auger@...hat.com,
	jean-philippe@...aro.org, mdf@...nel.org, mshavit@...gle.com,
	shameerali.kolothum.thodi@...wei.com, smostafa@...gle.com,
	yi.l.liu@...el.com
Subject: Re: [PATCH v2 10/19] iommufd/viommu: Add vdev_id helpers for IOMMU
 drivers

On Fri, Oct 04, 2024 at 10:19:43PM -0700, Nicolin Chen wrote:
> I tried exposing the struct iommufd_viommu to drivers, and was
> able to drop a couple of helpers, except these two:
> 
> struct device *vdev_to_dev(struct iommufd_vdevice *vdev)
> {
> 	return vdev ? vdev->idev->dev : NULL;
> } // Without it, we need to expose struct iommufd_device.
> 
> struct iommu_domain *
> iommufd_viommu_to_parent_domain(struct iommufd_viommu *viommu)
> {
> 	if (!viommu || !viommu->hwpt)
> 		return NULL;
> 	return viommu->hwpt->common.domain;
> } // Without it, we need to expose struct iommufd_hwpt_page.

It seems OK, there isn't really locking entanglements or performance
path on this stuff?

Jason