hijack.sh: exit_handler: collect dmesg throughout the whole test

Start collecting dmesg logs in the beggining of the test and run
collection in the background.

Signed-off-by: Emilia Kurdybelska <emiliax.kurdybelska@intel.com>

Author: ekurdybx

case-lib/hijack.sh

@@ -12,6 +12,12 @@ function func_exit_handler()
 
     dlogi "Starting func_exit_handler($exit_status)"
 
+    if [[ -n "$DMESG_PID" ]]; then
+        kill "$DMESG_PID" 2>/dev/null
+        wait "$DMESG_PID" 2>/dev/null
+        unset KERNEL_CHECKPOINT
+    fi
+
     func_lib_check_and_disable_pipewire
 
     # call trace
@@ -134,32 +140,6 @@ function func_exit_handler()
         storage_checks || exit_status=1
     fi
 
-    local journalctl_logs="$LOG_ROOT/dmesg.txt"
-    if [[ "$KERNEL_CHECKPOINT" =~ ^[0-9]{10} ]]; then
-        # Do not collect the entire duration of the test but only the
-        # last iteration.
-        dlogi "Save kernel messages since ${KERNEL_CHECKPOINT} to ${journalctl_logs}"
-        journalctl_cmd --since=@"$KERNEL_CHECKPOINT" > "${journalctl_logs}"
-    elif [[ "$KERNEL_CHECKPOINT" == "disabled" ]]; then
-        dlogi "Save all kernel messages to ${journalctl_logs}"
-        journalctl_cmd > "${journalctl_logs}"
-    else
-       dloge 'Kernel check point "KERNEL_CHECKPOINT" is not properly set'
-       dloge "KERNEL_CHECKPOINT=$KERNEL_CHECKPOINT"
-       test "$exit_status" -ne 0 || exit_status=1
-    fi
-    if test -s "${journalctl_logs}"; then
-       wcLog=$(wc -l "${journalctl_logs}")
-       dlogi  "nlines=$wcLog"
-    else
-       dlogw "Empty ${journalctl_logs}"
-    fi
-    # Make sure the logs are written on disk just in case of DUT power reset.
-    sync
-
-    # After log collected, KERNEL_CHECKPOINT will not be used any more
-    unset KERNEL_CHECKPOINT
-
     # get ps command result as list
     local -a cmd_lst
     # $$ as current script pid

case-lib/lib.sh

@@ -97,7 +97,7 @@ start_test()
     }
 
     # func_exit_handler() is in hijack.sh
-    trap 'func_exit_handler $?' EXIT
+    trap 'func_exit_handler $?' EXIT SIGTERM
 
     if test -z "$MAX_WAIT_FW_LOADING"; then
         local _pltf; _pltf=$("$SCRIPT_HOME/tools/sof-dump-status.py" -p)
@@ -125,6 +125,7 @@ start_test()
             die "FW is not loaded for $MAX_WAIT_FW_LOADING"
         fi
     }
+    func_dmesg_collect
 
     export SOF_TEST_TOP_PID="$$"
     local prefix; prefix="ktime=$(ktime) sof-test PID=${SOF_TEST_TOP_PID}"
@@ -408,6 +409,24 @@ func_mtrace_collect()
     sudo bash -c "${mtraceCmd[*]} &" >& "$clogfile"
 }
 
+func_dmesg_collect() {
+    local journalctl_logs="$LOG_ROOT/dmesg.txt"
+
+    if [[ "$KERNEL_CHECKPOINT" =~ ^[0-9]{10} ]]; then
+        dlogi "Saving kernel messages since ${KERNEL_CHECKPOINT} to ${journalctl_logs}"
+        journalctl_cmd --since=@"$KERNEL_CHECKPOINT" -f >> "${journalctl_logs}" &
+    elif [[ "$KERNEL_CHECKPOINT" == "disabled" ]]; then
+        dlogi "Saving all kernel messages"
+        journalctl_cmd -f >> "${journalctl_logs}" &
+    else
+        dloge 'Kernel check point "KERNEL_CHECKPOINT" is not properly set'
+        dloge "KERNEL_CHECKPOINT=$KERNEL_CHECKPOINT"
+        test "$exit_status" -ne 0 || exit_status=1
+        return
+    fi
+    DMESG_PID=$!
+}
+
 func_lib_log_post_process()
 {
     # SyS-T log output a Zephyr feature, no need postprocess