[LTP] [PATCH v4] thermal: add new test group
Piotr Kubaj
piotr.kubaj@intel.com
Fri Jan 23 13:49:52 CET 2026
This is a new test for checking thermal interrupt events.
Corrects issues pointed out by Petr Vorel for v3.
Signed-off-by: Piotr Kubaj <piotr.kubaj@intel.com>
---
runtest/thermal | 3 +
scenario_groups/default | 1 +
testcases/kernel/Makefile | 1 +
testcases/kernel/thermal/Makefile | 9 +
.../kernel/thermal/thermal_interrupt_events.c | 204 ++++++++++++++++++
5 files changed, 218 insertions(+)
create mode 100644 runtest/thermal
create mode 100644 testcases/kernel/thermal/Makefile
create mode 100644 testcases/kernel/thermal/thermal_interrupt_events.c
diff --git a/runtest/thermal b/runtest/thermal
new file mode 100644
index 000000000..57e3d29f8
--- /dev/null
+++ b/runtest/thermal
@@ -0,0 +1,3 @@
+# Thermal driver API
+# https://docs.kernel.org/driver-api/thermal/
+thermal_interrupt_events thermal_interrupt_events
diff --git a/scenario_groups/default b/scenario_groups/default
index 0e76b2bee..ffdd7ff25 100644
--- a/scenario_groups/default
+++ b/scenario_groups/default
@@ -26,3 +26,4 @@ crypto
kernel_misc
uevent
watchqueue
+thermal
diff --git a/testcases/kernel/Makefile b/testcases/kernel/Makefile
index 98fd45a9d..ac816e4e8 100644
--- a/testcases/kernel/Makefile
+++ b/testcases/kernel/Makefile
@@ -36,6 +36,7 @@ SUBDIRS += connectors \
sched \
security \
sound \
+ thermal \
tracing \
uevents \
watchqueue \
diff --git a/testcases/kernel/thermal/Makefile b/testcases/kernel/thermal/Makefile
new file mode 100644
index 000000000..4657c3fb3
--- /dev/null
+++ b/testcases/kernel/thermal/Makefile
@@ -0,0 +1,9 @@
+# SPDX-License-Identifier: GPL-2.0-or-later
+# Copyright (c) 2025, Intel Corporation. All rights reserved.
+# Author:Piotr Kubaj <piotr.kubaj@intel.com>
+
+top_srcdir ?= ../../..
+
+include $(top_srcdir)/include/mk/testcases.mk
+
+include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/thermal/thermal_interrupt_events.c b/testcases/kernel/thermal/thermal_interrupt_events.c
new file mode 100644
index 000000000..010487c9c
--- /dev/null
+++ b/testcases/kernel/thermal/thermal_interrupt_events.c
@@ -0,0 +1,204 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+/*
+ * Copyright (C) 2025-2026 Intel - http://www.intel.com/
+ */
+
+/*\
+ * Tests the CPU package thermal sensor interface for Intel platforms.
+
+ * Works by checking the initial count of thermal interrupts. Then it
+ * decreases the threshold for sending a thermal interrupt to just above
+ * the current temperature and runs a workload on the CPU. Finally, it restores
+ * the original thermal threshold and checks whether the number of thermal
+ * interrupts increased.
+ */
+
+#include "tst_safe_stdio.h"
+#include "tst_test.h"
+#define PATH_LEN 69
+#define RUNTIME 30
+#define SLEEP 10
+#define STRING_LEN 23
+#define TEMP_INCREMENT 10
+
+static char trip_path[PATH_LEN];
+static int nproc, trip;
+
+static void setup(void)
+{
+ nproc = tst_ncpus();
+ tst_res(TDEBUG, "Number of logical cores: %d", nproc);
+}
+
+static void cleanup(void)
+{
+ tst_res(TDEBUG, "Restoring original trip_point_1_temp value: %d", trip);
+ SAFE_FILE_PRINTF(trip_path, "%d", trip);
+}
+
+static void *cpu_workload(double run_time)
+{
+ time_t start_time = time(NULL);
+ int num = 2;
+
+ while (difftime(time(NULL), start_time) < run_time) {
+ for (int i = 2; i * i <= num; i++) {
+ if (num % i == 0)
+ break;
+ }
+ num++;
+ }
+ return NULL;
+}
+
+static void read_interrupts(uint64_t *interrupt_array, const int nproc)
+{
+ bool interrupts_found = 0;
+ char line[8192];
+
+ memset(interrupt_array, 0, nproc * sizeof(*interrupt_array));
+ FILE *fp = SAFE_FOPEN("/proc/interrupts", "r");
+
+ while (fgets(line, sizeof(line), fp)) {
+ if (strstr(line, "Thermal event interrupts")) {
+ interrupts_found = 1;
+ char *token = strtok(line, " ");
+
+ token = strtok(NULL, " ");
+ int i = 0;
+
+ while (!!strncmp(token, "Thermal", 7)) {
+ interrupt_array[i++] = atoll(token);
+ token = strtok(NULL, " ");
+ tst_res(TDEBUG, "Current value of interrupt_array[%d]: %ld", i - 1, interrupt_array[i - 1]);
+ }
+ }
+ }
+ SAFE_FCLOSE(fp);
+ if (!interrupts_found)
+ tst_brk(TCONF, "No Thermal event interrupts line in /proc/interrupts");
+}
+
+static void run(void)
+{
+ bool status = 1;
+ char line[8192];
+ uint64_t interrupt_init[nproc], interrupt_later[nproc];
+
+ read_interrupts(interrupt_init, nproc);
+
+ DIR *dir = SAFE_OPENDIR("/sys/class/thermal/");
+ struct dirent *entry;
+ int tz_counter = 0;
+
+ while ((entry = SAFE_READDIR(dir))) {
+ if ((strncmp(entry->d_name, "thermal_zone", sizeof("thermal_zone"))) > 0)
+ tz_counter++;
+ }
+ SAFE_CLOSEDIR(dir);
+ tst_res(TDEBUG, "Found %d thermal zone(s)", tz_counter);
+
+ bool x86_pkg_temp_tz[tz_counter], x86_pkg_temp_tz_found = 0;
+
+ memset(x86_pkg_temp_tz, 0, sizeof(x86_pkg_temp_tz));
+
+ for (int i = 0; i < tz_counter; i++) {
+ char path[PATH_LEN];
+
+ snprintf(path, PATH_LEN, "/sys/class/thermal/thermal_zone%d/type", i);
+ tst_res(TDEBUG, "Checking whether %s is x86_pkg_temp", path);
+
+ SAFE_FILE_SCANF(path, "%s", line);
+ if (strstr(line, "x86_pkg_temp")) {
+ tst_res(TDEBUG, "Thermal zone %d uses x86_pkg_temp", i);
+ x86_pkg_temp_tz[i] = 1;
+ x86_pkg_temp_tz_found = 1;
+ }
+ }
+ if (!x86_pkg_temp_tz_found) {
+ tst_res(TINFO, "No thermal zone uses x86_pkg_temp");
+ status = 0;
+ }
+
+ for (int i = 0; i < tz_counter; i++) {
+ if (x86_pkg_temp_tz[i]) {
+ char path[PATH_LEN], temp_path[PATH_LEN];
+ int sleep_time = SLEEP, temp_high, temp;
+ double run_time = RUNTIME;
+
+ snprintf(path, PATH_LEN, "/sys/class/thermal/thermal_zone%d/", i);
+ strncpy(temp_path, path, PATH_LEN);
+ strncat(temp_path, "temp", 4);
+ tst_res(TINFO, "Testing %s", temp_path);
+ SAFE_FILE_SCANF(temp_path, "%d", &temp);
+ if (temp < 0) {
+ tst_brk(TINFO, "Unexpected zone temperature value %d", temp);
+ status = 0;
+ }
+ tst_res(TDEBUG, "Current temperature for %s: %d", path, temp);
+
+ temp_high = temp + TEMP_INCREMENT;
+
+ strncpy(trip_path, path, PATH_LEN);
+ strncat(trip_path, "trip_point_1_temp", 17);
+
+ tst_res(TDEBUG, "Setting new trip_point_1_temp value: %d", temp_high);
+ SAFE_FILE_SCANF(trip_path, "%d", &trip);
+ SAFE_FILE_PRINTF(trip_path, "%d", temp_high);
+
+ while (sleep_time > 0) {
+ tst_res(TDEBUG, "Running for %f seconds, then sleeping for %d seconds", run_time, sleep_time);
+
+ for (int j = 0; j < nproc; j++) {
+ if (!SAFE_FORK()) {
+ cpu_workload(run_time);
+ exit(0);
+ }
+ }
+
+ for (int j = 0; j < nproc; j++)
+ tst_reap_children();
+
+ SAFE_FILE_SCANF(temp_path, "%d", &temp);
+ tst_res(TDEBUG, "Temperature for %s after a test: %d", path, temp);
+
+ if (temp > temp_high)
+ break;
+ sleep(sleep_time--);
+ run_time -= 3;
+ }
+ if (temp <= temp_high) {
+ tst_res(TINFO, "Zone temperature is not rising as expected");
+ status = 0;
+ }
+ }
+ }
+ read_interrupts(interrupt_later, nproc);
+
+ for (int i = 0; i < nproc; i++) {
+ if (interrupt_later[i] < interrupt_init[i]) {
+ tst_res(TINFO, "For CPU %d interrupt counter is currently %ld, while it was %ld before the test", i, interrupt_later[i], interrupt_init[i]);
+ status = 0;
+ }
+ }
+
+ if (status)
+ tst_res(TPASS, "x86 package thermal interrupt triggered");
+ else
+ tst_res(TFAIL, "x86 package thermal interrupt did not trigger");
+}
+
+static struct tst_test test = {
+ .cleanup = cleanup,
+ .forks_child = 1,
+ .min_runtime = 180,
+ .needs_root = 1,
+ .setup = setup,
+ .supported_archs = (const char *const []) {
+ "x86",
+ "x86_64",
+ NULL
+ },
+ .test_all = run
+};
--
2.47.3
---------------------------------------------------------------------
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