linux-kernel - RE: [PATCH v2 06/12] iommu: Make dev->fault

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Message-ID: <BN9PR11MB5276BE0DB32E8E7ACD84828E8C08A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date:   Thu, 3 Aug 2023 08:08:30 +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>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>
CC:     "Liu, Yi L" <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v2 06/12] iommu: Make dev->fault_param static

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Thursday, July 27, 2023 1:49 PM
>
> @@ -4630,7 +4621,6 @@ static int intel_iommu_disable_iopf(struct device
> *dev)
>  	 * fault handler and removing device from iopf queue should never
>  	 * fail.
>  	 */
> -	WARN_ON(iommu_unregister_device_fault_handler(dev));
>  	WARN_ON(iopf_queue_remove_device(iommu->iopf_queue, dev));

the comment should be updated too.

> 
>  	mutex_init(&param->lock);
> +	param->fault_param = kzalloc(sizeof(*param->fault_param),
> GFP_KERNEL);
> +	if (!param->fault_param) {
> +		kfree(param);
> +		return -ENOMEM;
> +	}
> +	mutex_init(&param->fault_param->lock);
> +	INIT_LIST_HEAD(&param->fault_param->faults);

let's also move 'partial' from struct iopf_device_param into struct
iommu_fault_param. That logic is not specific to sva.

meanwhile probably iopf_device_param can be renamed to
iopf_sva_param since all the remaining fields are only used by
the sva handler.

current naming (iommu_fault_param vs. iopf_device_param) is a
bit confusing when reading related code.