AMD IOMMU: enable event logging

The code to log IOMMU events is in place now. So enable event logging
with this patch.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 8 insertions, 0 deletions

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index eed488892c01..1974b73fece6 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -253,6 +253,13 @@ void __init iommu_enable(struct amd_iommu *iommu)
         iommu_feature_enable(iommu, CONTROL_IOMMU_EN);
 }
 
+/* Function to enable IOMMU event logging and event interrupts */
+void __init iommu_enable_event_logging(struct amd_iommu *iommu)
+{
+        iommu_feature_enable(iommu, CONTROL_EVT_LOG_EN);
+        iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
+}
+
 /*
  * mapping and unmapping functions for the IOMMU MMIO space. Each AMD IOMMU in
  * the system has one.
@@ -958,6 +965,7 @@ static void __init enable_iommus(void)
         list_for_each_entry(iommu, &amd_iommu_list, list) {
                 iommu_set_exclusion_range(iommu);
                 iommu_init_msi(iommu);
+                iommu_enable_event_logging(iommu);
                 iommu_enable(iommu);
         }
 }