ktest: Add MAX_MONITOR_WAIT option

If the console is constantly outputting content, this can cause ktest
to get stuck waiting on the monitor to settle down.

The option MAX_MONITOR_WAIT is the maximum time (in seconds) for ktest
to wait for the console to flush.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 15 insertions, 1 deletions

diff --git a/tools/testing/ktest/ktest.pl b/tools/testing/ktest/ktest.pl
index 5ad891a08113..d10fff12bc24 100755
--- a/tools/testing/ktest/ktest.pl
+++ b/tools/testing/ktest/ktest.pl
@@ -52,6 +52,7 @@ my %default = (
     "STOP_AFTER_SUCCESS"        => 10,
     "STOP_AFTER_FAILURE"        => 60,
     "STOP_TEST_AFTER"           => 600,
+    "MAX_MONITOR_WAIT"          => 1800,
 
 # required, and we will ask users if they don't have them but we keep the default
 # value something that is common.
@@ -98,6 +99,7 @@ my $reboot_on_success;
 my $die_on_failure;
 my $powercycle_after_reboot;
 my $poweroff_after_halt;
+my $max_monitor_wait;
 my $ssh_exec;
 my $scp_to_target;
 my $scp_to_target_install;
@@ -243,6 +245,7 @@ my %option_map = (
     "POWER_OFF"                 => \$power_off,
     "POWERCYCLE_AFTER_REBOOT"   => \$powercycle_after_reboot,
     "POWEROFF_AFTER_HALT"       => \$poweroff_after_halt,
+    "MAX_MONITOR_WAIT"          => \$max_monitor_wait,
     "SLEEP_TIME"                => \$sleep_time,
     "BISECT_SLEEP_TIME"         => \$bisect_sleep_time,
     "PATCHCHECK_SLEEP_TIME"     => \$patchcheck_sleep_time,
@@ -1133,7 +1136,10 @@ sub reboot {
     }
 
     if (defined($time)) {
-        wait_for_monitor($time, $reboot_success_line);
+        if (wait_for_monitor($time, $reboot_success_line)) {
+            # reboot got stuck?
+            run_command "$power_cycle";
+        }
         end_monitor;
     }
 }
@@ -1228,6 +1234,8 @@ sub wait_for_monitor {
     my $full_line = "";
     my $line;
     my $booted = 0;
+    my $start_time = time;
+    my $now;
 
     doprint "** Wait for monitor to settle down **\n";
 
@@ -1246,8 +1254,14 @@ sub wait_for_monitor {
         if ($line =~ /\n/) {
             $full_line = "";
         }
+        $now = time;
+        if ($now - $start_time >= $max_monitor_wait) {
+            doprint "Exiting monitor flush due to hitting MAX_MONITOR_WAIT\n";
+            return 1;
+        }
     }
     print "** Monitor flushed **\n";
+    return 0;
 }
 
 sub save_logs {