linux-kernel - Re: [PATCH v2 04/12] iommu: Replace device fault handler with iommu_queue

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Date:   Fri, 11 Aug 2023 09:23:55 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     baolu.lu@...ux.intel.com, Joerg Roedel <joro@...tes.org>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>,
        Yi Liu <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/12] iommu: Replace device fault handler with
 iommu_queue_iopf()

On 2023/8/11 2:22, Jason Gunthorpe wrote:
> On Thu, Jul 27, 2023 at 01:48:29PM +0800, Lu Baolu wrote:
>> The individual iommu drivers report iommu faults by calling
>> iommu_report_device_fault(), where a pre-registered device fault handler
>> is called to route the fault to another fault handler installed on the
>> corresponding iommu domain.
>>
>> The pre-registered device fault handler is static and won't be dynamic
>> as the fault handler is eventually per iommu domain. Replace calling
>> device fault handler with iommu_queue_iopf().
>>
>> Signed-off-by: Lu Baolu<baolu.lu@...ux.intel.com>
>> ---
>>   drivers/iommu/iommu.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
>> index 4352a149a935..00309f66153b 100644
>> --- a/drivers/iommu/iommu.c
>> +++ b/drivers/iommu/iommu.c
>> @@ -1381,7 +1381,7 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
>>   		mutex_unlock(&fparam->lock);
>>   	}
>>   
>> -	ret = fparam->handler(&evt->fault, fparam->data);
>> +	ret = iommu_queue_iopf(&evt->fault, dev);
>>   	if (ret && evt_pending) {
>>   		mutex_lock(&fparam->lock);
>>   		list_del(&evt_pending->list);
> I don't get it, why not remove fparam->handler/data entirely in this
> patch? There is no user once you do this change?

It needs some cleanups elsewhere, so I put it in a separate patch.

Best regards,
baolu