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iommu/vt-d: Add cache invalidation latency sampling 

Queued invalidation execution time is performance critical and needs
to be monitored. This adds code to sample the execution time of IOTLB/
devTLB/ICE cache invalidation.

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/20210610020115.1637656-16-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lu Baolu 2021-06-10 10:01:07 +08:00 committed by Joerg Roedel
parent 456bb0b97f
commit 74eb87a0f9
1 changed files with 31 additions and 0 deletions
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31
drivers/iommu/intel/dmar.c
View File

@ -34,6 +34,7 @@
#include <trace/events/intel_iommu.h>
#include "../irq_remapping.h"
#include "perf.h"
typedef int (*dmar_res_handler_t)(struct acpi_dmar_header *, void *);
struct dmar_res_callback {
@ -1342,15 +1343,33 @@ int qi_submit_sync(struct intel_iommu *iommu, struct qi_desc *desc,
unsigned int count, unsigned long options)
{
struct q_inval *qi = iommu->qi;
s64 devtlb_start_ktime = 0;
s64 iotlb_start_ktime = 0;
s64 iec_start_ktime = 0;
struct qi_desc wait_desc;
int wait_index, index;
unsigned long flags;
int offset, shift;
int rc, i;
u64 type;
if (!qi)
return 0;
type = desc->qw0 & GENMASK_ULL(3, 0);
if ((type == QI_IOTLB_TYPE || type == QI_EIOTLB_TYPE) &&
dmar_latency_enabled(iommu, DMAR_LATENCY_INV_IOTLB))
iotlb_start_ktime = ktime_to_ns(ktime_get());
if ((type == QI_DIOTLB_TYPE || type == QI_DEIOTLB_TYPE) &&
dmar_latency_enabled(iommu, DMAR_LATENCY_INV_DEVTLB))
devtlb_start_ktime = ktime_to_ns(ktime_get());
if (type == QI_IEC_TYPE &&
dmar_latency_enabled(iommu, DMAR_LATENCY_INV_IEC))
iec_start_ktime = ktime_to_ns(ktime_get());
restart:
rc = 0;
@ -1425,6 +1444,18 @@ restart:
if (rc == -EAGAIN)
goto restart;
if (iotlb_start_ktime)
dmar_latency_update(iommu, DMAR_LATENCY_INV_IOTLB,
ktime_to_ns(ktime_get()) - iotlb_start_ktime);
if (devtlb_start_ktime)
dmar_latency_update(iommu, DMAR_LATENCY_INV_DEVTLB,
ktime_to_ns(ktime_get()) - devtlb_start_ktime);
if (iec_start_ktime)
dmar_latency_update(iommu, DMAR_LATENCY_INV_IEC,
ktime_to_ns(ktime_get()) - iec_start_ktime);
return rc;
}