linux-kernel - RE: [PATCH 1/4] iommu/vt-d: Introduce dev_to

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Date:   Thu, 16 Nov 2023 03:19:13 +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:     "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/4] iommu/vt-d: Introduce dev_to_iommu()

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Thursday, November 16, 2023 9:51 AM
> 
> +static inline struct intel_iommu *dev_to_iommu(struct device *dev)
> +{
> +	/*
> +	 * Assume that valid per-device iommu structure must be installed
> +	 * if iommu_probe_device() has succeeded. This helper could only
> +	 * be used after device is probed.
> +	 */
> +	return ((struct device_domain_info *)dev_iommu_priv_get(dev))-
> >iommu;
> +}

Not sure whether this helper is useful. This is only used by 2 out of 5
post-probe users. Probably just open-coding in all 5 places is clearer.