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iommu/vt-d: Add PRQ handling latency sampling

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The execution time for page fault request handling is performance critical
and needs to be monitored. This adds code to sample the execution time of
page fault request handling.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20210520031531.712333-1-baolu.lu@linux.intel.com
Link: https://lore.kernel.org/r/20210610020115.1637656-17-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2021-06-10 10:01:08 +08:00 committed by Joerg Roedel
parent 74eb87a0f9
commit 0f4834ab25
1 changed files with 13 additions and 3 deletions
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16
drivers/iommu/intel/svm.c
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@ -24,6 +24,7 @@
#include <trace/events/intel_iommu.h>
#include "pasid.h"
#include "perf.h"
#include "../iommu-sva-lib.h"
static irqreturn_t prq_event_thread(int irq, void *d);
@ -838,8 +839,8 @@ static int prq_to_iommu_prot(struct page_req_dsc *req)
return prot;
}
static int
intel_svm_prq_report(struct device *dev, struct page_req_dsc *desc)
static int intel_svm_prq_report(struct intel_iommu *iommu, struct device *dev,
struct page_req_dsc *desc)
{
struct iommu_fault_event event;
@ -871,6 +872,12 @@ intel_svm_prq_report(struct device *dev, struct page_req_dsc *desc)
event.fault.prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA;
memcpy(event.fault.prm.private_data, desc->priv_data,
sizeof(desc->priv_data));
} else if (dmar_latency_enabled(iommu, DMAR_LATENCY_PRQ)) {
/*
* If the private data fields are not used by hardware, use it
* to monitor the prq handle latency.
*/
event.fault.prm.private_data[0] = ktime_to_ns(ktime_get());
}
return iommu_report_device_fault(dev, &event);
@ -983,7 +990,7 @@ bad_req:
* If prq is to be handled outside iommu driver via receiver of
* the fault notifiers, we skip the page response here.
*/
if (intel_svm_prq_report(sdev->dev, req))
if (intel_svm_prq_report(iommu, sdev->dev, req))
handle_bad_prq_event(iommu, req, QI_RESP_INVALID);
trace_prq_report(iommu, sdev->dev, req->qw_0, req->qw_1,
@ -1172,6 +1179,9 @@ int intel_svm_page_response(struct device *dev,
if (private_present)
memcpy(&desc.qw2, prm->private_data,
sizeof(prm->private_data));
else if (prm->private_data[0])
dmar_latency_update(iommu, DMAR_LATENCY_PRQ,
ktime_to_ns(ktime_get()) - prm->private_data[0]);
qi_submit_sync(iommu, &desc, 1, 0);
}