[PATCH V3 7/7] iommu/vt-d: Enable IOMMU perfmon support

[kan . liang]

From: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>

Register and enable an IOMMU perfmon for each active IOMMU device.

The failure of IOMMU perfmon registration doesn't impact other
functionalities of an IOMMU device.

Signed-off-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
---
 drivers/iommu/intel/dmar.c  | 3 +++
 drivers/iommu/intel/iommu.c | 3 +++
 2 files changed, 6 insertions(+)

diff --git a/drivers/iommu/intel/dmar.c b/drivers/iommu/intel/dmar.c
index 43db6ebe8b57..6acfe879589c 100644
--- a/drivers/iommu/intel/dmar.c
+++ b/drivers/iommu/intel/dmar.c
@@ -1144,6 +1144,8 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd)
 		err = iommu_device_register(&iommu->iommu, &intel_iommu_ops, NULL);
 		if (err)
 			goto err_sysfs;
+
+		iommu_pmu_register(iommu);
 	}
 
 	drhd->iommu = iommu;
@@ -1166,6 +1168,7 @@ static int alloc_iommu(struct dmar_drhd_unit *drhd)
 static void free_iommu(struct intel_iommu *iommu)
 {
 	if (intel_iommu_enabled && !iommu->drhd->ignored) {
+		iommu_pmu_unregister(iommu);
 		iommu_device_unregister(&iommu->iommu);
 		iommu_device_sysfs_remove(&iommu->iommu);
 	}
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 560a54c3cbda..d39787944cc7 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -30,6 +30,7 @@
 #include "../iommu-sva.h"
 #include "pasid.h"
 #include "cap_audit.h"
+#include "perfmon.h"
 
 #define ROOT_SIZE		VTD_PAGE_SIZE
 #define CONTEXT_SIZE		VTD_PAGE_SIZE
@@ -4013,6 +4014,8 @@ int __init intel_iommu_init(void)
 				       intel_iommu_groups,
 				       "%s", iommu->name);
 		iommu_device_register(&iommu->iommu, &intel_iommu_ops, NULL);
+
+		iommu_pmu_register(iommu);
 	}
 	up_read(&dmar_global_lock);
 
-- 
2.35.1