diff --git a/drivers/iommu/qcom-iommu-debug-user.c b/drivers/iommu/qcom-iommu-debug-user.c
index c991a2030f80..71993447d9f1 100644
--- a/drivers/iommu/qcom-iommu-debug-user.c
+++ b/drivers/iommu/qcom-iommu-debug-user.c
@@ -1203,6 +1203,22 @@ static int iommu_debug_functional_fast_dma_api_show(struct seq_file *s,
 						    void *ignored)
 {
 	int ret = 0;
+	struct iommu_debug_device *ddev = s->private;
+
+	if (!ddev->test_dev) {
+		pr_err("%s:Have you selected a uscase?\n", __func__);
+		return -EINVAL;
+	}
+
+	if (!ddev->fastmap_usecase) {
+		ps_printf(dev_name(ddev->test_dev), s,
+			"Not a fastmap usecase\n");
+		return 0;
+	} else if (!IS_ENABLED(CONFIG_IOMMU_IO_PGTABLE_FAST)) {
+		ps_printf(dev_name(ddev->test_dev), s,
+			"CONFIG_IOMMU_IO_PGTABLE_FAST not enabled\n");
+		return 0;
+	}
 
 	ret |= __apply_to_new_mapping(s, __functional_dma_api_alloc_test, NULL);
 	ret |= __apply_to_new_mapping(s, __functional_dma_api_basic_test, NULL);
diff --git a/drivers/iommu/qcom-iommu-debug.c b/drivers/iommu/qcom-iommu-debug.c
index feb51650662b..f30ef09aa390 100644
--- a/drivers/iommu/qcom-iommu-debug.c
+++ b/drivers/iommu/qcom-iommu-debug.c
@@ -133,6 +133,7 @@ iommu_debug_switch_usecase(struct iommu_debug_device *ddev, u32 usecase_nr)
 {
 	struct platform_device *test_pdev;
 	struct device_node *child;
+	const char *str;
 	int child_nr = 0;
 	int ret;
 
@@ -169,6 +170,10 @@ iommu_debug_switch_usecase(struct iommu_debug_device *ddev, u32 usecase_nr)
 		goto out;
 	}
 
+	if (of_property_read_string(child, "qcom,iommu-dma", &str))
+		str = "default";
+
+	ddev->fastmap_usecase = !strcmp(str, "fastmap");
 	ddev->usecase_nr = usecase_nr;
 	ddev->test_dev = &test_pdev->dev;
 	ddev->domain = iommu_get_domain_for_dev(ddev->test_dev);
diff --git a/drivers/iommu/qcom-iommu-debug.h b/drivers/iommu/qcom-iommu-debug.h
index 41e06082e01b..78f3106ea9eb 100644
--- a/drivers/iommu/qcom-iommu-debug.h
+++ b/drivers/iommu/qcom-iommu-debug.h
@@ -1,7 +1,7 @@
 /* SPDX-License-Identifier: GPL-2.0-only */
 /*
  * Copyright (c) 2015-2021, The Linux Foundation. All rights reserved.
- *
+ * Copyright (c) 2022, Qualcomm Innovation Center, Inc. All rights reserved.
  */
 
 #ifndef __DRIVERS_IOMMU_QCOM_IOMMU_DEBUG_H__
@@ -26,6 +26,7 @@ struct iommu_debug_device {
 	struct device *test_dev;
 	struct iommu_domain *domain;
 	u32 usecase_nr;
+	bool fastmap_usecase;
 	/* Protects test_dev */
 	struct mutex state_lock;
 	/* For waiting for child probe to complete */