[PATCH v5 23/23] iommu: use sva invalidate and device fault trace event

Jacob Pan
2018-05-11T20:54:15Z

For performance and debugging purposes, these trace events help
analyzing device faults and passdown invalidations 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: Jacob Pan <jacob.jun.pan@linux.intel.com>
---
drivers/iommu/iommu.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 1f2f49e..0108970 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1006,6 +1006,7 @@ int iommu_report_device_fault(struct device *dev, struct iommu_fault_event *evt)
mutex_unlock(&fparam->lock);
}
ret = fparam->handler(evt, fparam->data);
+ trace_dev_fault(dev, evt);
done_unlock:
mutex_unlock(&dev->iommu_param->lock);
return ret;
@@ -1574,6 +1575,7 @@ int iommu_sva_invalidate(struct iommu_domain *domain,
return -ENODEV;

ret = domain->ops->sva_invalidate(domain, dev, inv_info);
+ trace_sva_invalidate(dev, inv_info);

return ret;
}
@@ -1611,6 +1613,7 @@ int iommu_page_response(struct device *dev,
if (evt->pasid == msg->pasid &&
msg->page_req_group_id == evt->page_req_group_id) {
msg->private_data = evt->iommu_private;
+ trace_dev_page_response(dev, msg);
ret = domain->ops->page_response(dev, msg);
list_del(&evt->list);
kfree(evt);
--
2.7.4