diff --git a/drivers/gpu/nvgpu/include/nvgpu/posix/io.h b/drivers/gpu/nvgpu/include/nvgpu/posix/io.h
index d23bee9b3..4e82dd985 100644
--- a/drivers/gpu/nvgpu/include/nvgpu/posix/io.h
+++ b/drivers/gpu/nvgpu/include/nvgpu/posix/io.h
@@ -123,4 +123,17 @@ void nvgpu_posix_io_record_access(struct gk20a *g,
 bool nvgpu_posix_io_check_sequence(struct gk20a *g,
 	struct nvgpu_reg_access *sequence, u32 size, bool strict);
 
+#ifdef NVGPU_UNITTEST_FAULT_INJECTION_ENABLEMENT
+/**
+ * @brief Get fault injection structure.
+ *
+ * @param void.
+ *
+ * Returns the reference to nvgpu_readl fault injection structure.
+ *
+ * @return Pointer to nvgpu_readl fault injection structure.
+ */
+struct nvgpu_posix_fault_inj *nvgpu_readl_get_fault_injection(void);
+#endif
+
 #endif
diff --git a/drivers/gpu/nvgpu/libnvgpu-drv_safe.export b/drivers/gpu/nvgpu/libnvgpu-drv_safe.export
index 8977e084d..b31d0104d 100644
--- a/drivers/gpu/nvgpu/libnvgpu-drv_safe.export
+++ b/drivers/gpu/nvgpu/libnvgpu-drv_safe.export
@@ -601,6 +601,7 @@ nvgpu_rbtree_search
 nvgpu_rbtree_unlink
 nvgpu_readl
 nvgpu_readl_impl
+nvgpu_readl_get_fault_injection
 nvgpu_request_firmware
 nvgpu_runlist_cleanup_sw
 nvgpu_runlist_construct_locked
diff --git a/drivers/gpu/nvgpu/os/posix/posix-io.c b/drivers/gpu/nvgpu/os/posix/posix-io.c
index 4c19e5d8c..9e16703ab 100644
--- a/drivers/gpu/nvgpu/os/posix/posix-io.c
+++ b/drivers/gpu/nvgpu/os/posix/posix-io.c
@@ -25,10 +25,21 @@
 #include <nvgpu/bug.h>
 
 #include <nvgpu/posix/io.h>
+#include <nvgpu/posix/posix-fault-injection.h>
 
 #include "os_posix.h"
 
 
+#ifdef NVGPU_UNITTEST_FAULT_INJECTION_ENABLEMENT
+struct nvgpu_posix_fault_inj *nvgpu_readl_get_fault_injection(void)
+{
+	struct nvgpu_posix_fault_inj_container *c =
+			nvgpu_posix_fault_injection_get_container();
+
+	return &c->nvgpu_readl_fi;
+}
+#endif
+
 /*
  * This function sets the IO callbacks to the passed set of callbacks. It
  * returns the value of the old IO callback struct pointer. This function
@@ -80,6 +91,13 @@ u32 nvgpu_readl(struct gk20a *g, u32 r)
 		.value = 0L
 	};
 
+#ifdef NVGPU_UNITTEST_FAULT_INJECTION_ENABLEMENT
+	if (nvgpu_posix_fault_injection_handle_call(
+			nvgpu_readl_get_fault_injection()) == true) {
+		return 0;
+	}
+#endif
+
 	if (callbacks == NULL || callbacks->readl == NULL) {
 		BUG();
 	}