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path: root/drivers/iommu/amd_iommu_v2.c
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Diffstat (limited to 'drivers/iommu/amd_iommu_v2.c')
-rw-r--r--drivers/iommu/amd_iommu_v2.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/iommu/amd_iommu_v2.c b/drivers/iommu/amd_iommu_v2.c
index 8add9f125d3e..036fe9bf157e 100644
--- a/drivers/iommu/amd_iommu_v2.c
+++ b/drivers/iommu/amd_iommu_v2.c
@@ -921,7 +921,16 @@ static int __init amd_iommu_v2_init(void)
size_t state_table_size;
int ret;
- pr_info("AMD IOMMUv2 driver by Joerg Roedel <joerg.roedel@amd.com>");
+ pr_info("AMD IOMMUv2 driver by Joerg Roedel <joerg.roedel@amd.com>\n");
+
+ if (!amd_iommu_v2_supported()) {
+ pr_info("AMD IOMMUv2 functionality not available on this sytem\n");
+ /*
+ * Load anyway to provide the symbols to other modules
+ * which may use AMD IOMMUv2 optionally.
+ */
+ return 0;
+ }
spin_lock_init(&state_lock);
@@ -961,6 +970,9 @@ static void __exit amd_iommu_v2_exit(void)
size_t state_table_size;
int i;
+ if (!amd_iommu_v2_supported())
+ return;
+
profile_event_unregister(PROFILE_TASK_EXIT, &profile_nb);
amd_iommu_unregister_ppr_notifier(&ppr_nb);