linux-kernel - RE: [PATCH v4 04/16] iommu: Always register bus notifiers

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Message-ID: <BN9PR11MB527614514208CC25D5809FEA8C6D9@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Thu, 18 Aug 2022 07:34:38 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Robin Murphy <robin.murphy@....com>,
        "joro@...tes.org" <joro@...tes.org>
CC:     "will@...nel.org" <will@...nel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "baolu.lu@...ux.intel.com" <baolu.lu@...ux.intel.com>,
        "suravee.suthikulpanit@....com" <suravee.suthikulpanit@....com>,
        "vasant.hegde@....com" <vasant.hegde@....com>,
        "mjrosato@...ux.ibm.com" <mjrosato@...ux.ibm.com>,
        "schnelle@...ux.ibm.com" <schnelle@...ux.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v4 04/16] iommu: Always register bus notifiers

> From: Robin Murphy <robin.murphy@....com>
> Sent: Tuesday, August 16, 2022 12:20 AM
> 
> The number of bus types that the IOMMU subsystem deals with is small and
> manageable, so pull that list into core code as a first step towards
> cleaning up all the boilerplate bus-awareness from drivers. Calling
> iommu_probe_device() before bus->iommu_ops is set will simply return
> -ENODEV and not break the notifier call chain, so there should be no
> harm in proactively registering all our bus notifiers at init time.
> 
> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Tested-by: Matthew Rosato <mjrosato@...ux.ibm.com> # s390
> Tested-by: Niklas Schnelle <schnelle@...ux.ibm.com> # s390
> Signed-off-by: Robin Murphy <robin.murphy@....com>

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