Modified iommu testcase and readme

This test validates the IOMMU (Input-Output Memory Management Unit) support
by checking IOMMU configs and checks if the corresponding drivers are
loaded instead of just checking the dmesg logs.

Signed-off-by: Vamsee Narapareddi <[email protected]>

Author: vnarapar

Runner/suites/Kernel/FunctionalArea/baseport/iommu/README.md

@@ -0,0 +1,43 @@
+# IOMMU Validation Test
+
+This test validates the IOMMU (Input-Output Memory Management Unit) support and runtime status on Qualcomm platforms with Yocto builds.
+
+## Overview
+
+The test script performs these functional checks:
+
+1. **Kernel Configuration**:
+   - Validates presence of `CONFIG_IOMMU_SUPPORT` and `CONFIG_ARM_SMMU*` entries in `/proc/config.gz`.
+
+2. **Driver Loading**:
+   - Confirms SMMU/IOMMU-related drivers are loaded via `/proc/modules`.
+
+3. **Device Tree Nodes**:
+   - Verifies IOMMU/SMMU-related nodes in `/proc/device-tree`.
+
+4. **Runtime Verification**:
+   - Checks `dmesg` for any runtime IOMMU initialization or fault logs.
+
+## How to Run
+
+```sh
+source init_env
+cd suites/Kernel/FunctionalArea/IOMMU_Validation
+./run.sh
+```
+
+## Prerequisites
+
+- `dmesg`, `grep`, `zgrep`, `lsmod` must be available
+- Root access may be required for complete validation
+
+## Result Format
+
+Test result will be saved in `IOMMU.res` as:
+- `IOMMU PASS` – if all validations pass
+- `IOMMU FAIL` – if any check fails
+
+## License
+
+SPDX-License-Identifier: BSD-3-Clause-Clear  
+(C) Qualcomm Technologies, Inc. and/or its subsidiaries.

Runner/suites/Kernel/FunctionalArea/baseport/iommu/run.sh

@@ -39,15 +39,48 @@ log_info "----------------------------------------------------------------------
 log_info "-------------------Starting $TESTNAME Testcase----------------------------"
 log_info "=== Test Initialization ==="
 
-# Run the command and capture the output
-OUTPUT=$(dmesg | grep iommu)
+check_runtime_behavior() {
+    if dmesg | grep -i -q "msm_iommu.*enabled"; then
+        log_info "Runtime logs show Qualcomm MSM IOMMU is active"
+    elif dmesg | grep -i -q "iommu.*enabled"; then
+        log_info "Runtime logs show IOMMU is active"
+    else
+        log_fail "No runtime indication of IOMMU being active"
+        return 1
+    fi
+    return 0
+}
+
+pass=true
+
+CONFIGS="CONFIG_IOMMU_SUPPORT CONFIG_QCOM_IOMMU CONFIG_ARM_SMMU"
+check_kernel_config "$CONFIGS" || {
+    log_fail "Kernel config validation failed."
+    echo "$TESTNAME FAIL" > "$res_file"
+    exit 1
+}
+LOADED_MODULES="msm_iommu arm_smmu"
+check_driver_loaded "$LOADED_MODULES" || {
+    log_fail "Failed to load required driver modules"
+    echo "$TESTNAME FAIL" > "$res_file"
+    exit 1
+}
+
+DT_NODES="/proc/device-tree/soc@0/iommu@15000000 /proc/device-tree/soc/iommu@15000000"
+check_dt_nodes "$DT_NODES" || {
+    log_fail "Device tree validation failed."
+    echo "$TESTNAME FAIL" > "$res_file"
+    exit 1
+}
+
+check_runtime_behavior || pass=false
 
-# Check if the output is null
-if [ -z "$OUTPUT" ]; then
+if $pass; then
     log_pass "$TESTNAME : Test Passed"
     echo "$TESTNAME PASS" > "$res_file"
 else
     log_fail "$TESTNAME : Test Failed"
     echo "$TESTNAME FAIL" > "$res_file"
 fi
+
 log_info "-------------------Completed $TESTNAME Testcase----------------------------"