linux-kernel - Re: [PATCH v4 09/10] iommu: Make iommu_queue

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Message-ID: <cfd9e0b8-167e-a79b-9ef1-b3bfa38c9199@linux.intel.com>
Date:   Sat, 26 Aug 2023 16:04:12 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     "Tian, Kevin" <kevin.tian@...el.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:     baolu.lu@...ux.intel.com, "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 v4 09/10] iommu: Make iommu_queue_iopf() more generic

On 8/25/23 4:17 PM, Tian, Kevin wrote:
>> +static void assert_no_pending_iopf(struct device *dev, ioasid_t pasid)
>> +{
>> +	struct iommu_fault_param *iopf_param = dev->iommu-
>>> fault_param;
>> +	struct iopf_fault *iopf;
>> +
>> +	if (!iopf_param)
>> +		return;
>> +
>> +	mutex_lock(&iopf_param->lock);
>> +	list_for_each_entry(iopf, &iopf_param->partial, list) {
>> +		if (WARN_ON(iopf->fault.prm.pasid == pasid))
>> +			break;
>> +	}
> partial list is protected by dev_iommu lock.
> 

Ah, do you mind elaborating a bit more? In my mind, partial list is
protected by dev_iommu->fault_param->lock.

Best regards,
baolu