[LTP] thermal: add new test group

[Cyril Hrubis]

Hi!
I've been debugging the test random failures and it all boils down to
two things:

- the sysfs temperature values are in mC the increment we have is way
  too small

- we need to set the trigger value in the while(sleep_time > 0) loop
  otherwise we can end up running all the iterations with a value that
  is too high (if we enter the function when the CPU temperature was
  high)

The test runs reliably for me with -i 100 with these changes, I can push
the test with these changes added if you agree:

diff --git a/testcases/kernel/thermal/thermal_interrupt_events.c b/testcases/kernel/thermal/thermal_interrupt_events.c
index 42e1532f6..ed55632dc 100644
--- a/testcases/kernel/thermal/thermal_interrupt_events.c
+++ b/testcases/kernel/thermal/thermal_interrupt_events.c
@@ -20,10 +20,10 @@
 #include "tst_timer_test.h"

 #define        TEST_RUNTIME    ((RUNTIME + SLEEPTIME) * (SLEEPTIME / 2) + COOLDOWN)
-#define        RUNTIME         30
+#define        RUNTIME         10
 #define        SLEEPTIME       10
 #define        COOLDOWN        300
-#define        TEMP_INCREMENT  10
+#define        TEMP_INCREMENT  5000

 static bool *x86_pkg_temp_tz;
 static char temp_path[PATH_MAX], trip_path[PATH_MAX];
@@ -135,13 +135,8 @@ static void cpu_workload(double run_time)
        }
 }

-static void test_zone(int i)
+static void set_trippoint(void)
 {
-       int sleep_time = SLEEPTIME;
-       double run_time = RUNTIME;
-
-       snprintf(temp_path, PATH_MAX, "/sys/class/thermal/thermal_zone%d/temp", i);
-       tst_res(TINFO, "Testing %s", temp_path);
        SAFE_FILE_SCANF(temp_path, "%d", &temp);
        if (temp < 0)
                tst_brk(TBROK, "Unexpected zone temperature value %d", temp);
@@ -150,10 +145,21 @@ static void test_zone(int i)

        temp_high = temp + TEMP_INCREMENT;

-       snprintf(trip_path, PATH_MAX, "/sys/class/thermal/thermal_zone%d/trip_point_1_temp", i);
-
        tst_res(TDEBUG, "Setting new trip_point_1_temp value: %d", temp_high);
        SAFE_FILE_PRINTF(trip_path, "%d", temp_high);
+}
+
+static void test_zone(int i)
+{
+       int sleep_time = SLEEPTIME;
+       double run_time = RUNTIME;
+
+       snprintf(temp_path, PATH_MAX, "/sys/class/thermal/thermal_zone%d/temp", i);
+       snprintf(trip_path, PATH_MAX, "/sys/class/thermal/thermal_zone%d/trip_point_1_temp", i);
+
+       tst_res(TINFO, "Testing %s", temp_path);
+
+       set_trippoint();

        while (sleep_time > 0) {
                tst_res(TDEBUG, "Running for %f seconds, then sleeping for %d seconds", run_time, sleep_time);
@@ -173,7 +179,9 @@ static void test_zone(int i)
                if (temp > temp_high)
                        break;
                sleep(sleep_time--);
-               run_time -= 3;
+               run_time--;
+
+               set_trippoint();
        }
 }


-- 
Cyril Hrubis
chrubis@suse.cz