Commit 5d84ca80 authored by Jacob Pan's avatar Jacob Pan Committed by Zheng Zengkai
Browse files

iommu: Use device fault trace event 

maillist inclusion
category: feature
bugzilla: 51855
CVE: NA

Reference: https://jpbrucker.net/git/linux/commit/?h=sva/2021-03-01&id=f6cfa2e3655787bc3f90c50aff7cc75d0746bdf3



---------------------------------------------

For performance and debugging purposes, these trace events help
analyzing device faults that interact with IOMMU subsystem.
E.g.
IOMMU:0000:00:0a.0 type=2 reason=0 addr=0x00000000007ff000 pasid=1
group=1 last=0 prot=1

Signed-off-by: default avatarJacob Pan <jacob.jun.pan@linux.intel.com>
[JPB: removed invalidate event, that will be added later]
Signed-off-by: default avatarJean-Philippe Brucker <jean-philippe@linaro.org>

Signed-off-by: default avatarLijun Fang <fanglijun3@huawei.com>
Reviewed-by: default avatarWeilong Chen <chenweilong@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent 083ae66e

drivers/iommu/iommu.c

+2 −0
Original line number Diff line number Diff line
@@ -1259,6 +1259,7 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt) 
		mutex_unlock(&fparam->lock);

		kfree(evt_pending);

	}

	trace_dev_fault(dev, &evt->fault);

done_unlock:

	mutex_unlock(&param->lock);

	return ret;
@@ -1318,6 +1319,7 @@ int iommu_page_response(struct device *dev, 
		}



		ret = domain->ops->page_response(dev, evt, msg);

		trace_dev_page_response(dev, msg);

		list_del(&evt->list);

		kfree(evt);

		break;