linux-kernel - RE: [PATCH v3 04/15] iommu: Move bus setup to IOMMU device registration

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Date:   Thu, 7 Jul 2022 06:51:17 +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>,
        "gerald.schaefer@...ux.ibm.com" <gerald.schaefer@...ux.ibm.com>,
        "schnelle@...ux.ibm.com" <schnelle@...ux.ibm.com>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 04/15] iommu: Move bus setup to IOMMU device
 registration

> From: Robin Murphy <robin.murphy@....com>
> Sent: Wednesday, July 6, 2022 1:08 AM
> 
> @@ -202,12 +210,32 @@ int iommu_device_register(struct iommu_device
> *iommu,
>  	spin_lock(&iommu_device_lock);
>  	list_add_tail(&iommu->list, &iommu_device_list);
>  	spin_unlock(&iommu_device_lock);
> +
> +	for (int i = 0; i < ARRAY_SIZE(iommu_buses); i++) {
> +		struct bus_type *bus = iommu_buses[i];
> +		int err;
> +
> +		if (bus->iommu_ops && bus->iommu_ops != ops) {
> +			err = -EBUSY;
> +		} else {
> +			bus->iommu_ops = ops;
> +			err = bus_iommu_probe(bus);
> +		}
> +		if (err) {
> +			iommu_device_unregister(iommu);
> +			return err;
> +		}
> +	}
> +

Probably move above into a new function bus_iommu_probe_all():

	/* probe all buses for devices associated with this iommu */
	err = bus_iommu_probe_all();
	if (err) {
		iommu_device_unregister(iommu);
		return err;
	}

Just  my personal preference on leaving logic in iommu_device_register()
more relevant to the iommu instance itself.

Apart from that:

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