[LTP] [PATCH] thermal: add new test group

Piotr Kubaj
2026-01-19T08:52:17Z

This is a new test for checking thermal interrupt events.

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 | 188 ++++++++++++++++++
5 files changed, 202 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..b85237f95
--- /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.sh
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..c9f283f6e
--- /dev/null
+++ b/testcases/kernel/thermal/thermal_interrupt_events.c
@@ -0,0 +1,188 @@
+// 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"
+#include <ctype.h>
+#include <pthread.h>
+#include <regex.h>
+#define PATH_LEN 69
+#define STRING_LEN 23
+
+static void *cpu_workload(void *arg)
+{
+ time_t start_time = time(NULL);
+
+ int num = 2;
+ while(difftime(time(NULL), start_time) < *(double*)arg)
+ {
+ 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 uint16_t 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(!!strcmp(token, "Thermal"))
+ {
+ 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];
+ const uint16_t nproc = sysconf(_SC_NPROCESSORS_ONLN);
+ uint64_t interrupt_init[nproc], interrupt_later[nproc];
+ tst_res(TDEBUG, "Number of logical cores: %d", nproc);
+ read_interrupts(interrupt_init, nproc);
+
+ DIR *dir;
+ dir = SAFE_OPENDIR("/sys/class/thermal/");
+ struct dirent *entry;
+ regex_t regex;
+ uint8_t tz_counter = 0;
+
+ if(regcomp(&regex, "thermal_zone", REG_EXTENDED) != 0) tst_res(TINFO | TTERRNO, "regcomp");
+
+ while((entry = readdir(dir)) != NULL)
+ {
+ if (regexec(&regex, entry->d_name, 0, NULL, 0) == 0) tz_counter++;
+ }
+ SAFE_CLOSEDIR(dir);
+ regfree(&regex);
+ 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(uint8_t i = 0; i < tz_counter; i++)
+ {
+ char path[PATH_LEN];
+ snprintf(path, PATH_LEN, "/sys/class/thermal/thermal_zone%d/type", i);
+ FILE *fp = SAFE_FOPEN(path, "r");
+ if(fgets(line, sizeof(line), fp) && 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;
+ }
+ SAFE_FCLOSE(fp);
+ }
+ if(!x86_pkg_temp_tz_found)
+ {
+ tst_res(TINFO, "No thermal zone uses x86_pkg_temp");
+ status = 0;
+ }
+
+ for(uint8_t i = 0; i < tz_counter; i++)
+ {
+ if(x86_pkg_temp_tz[i])
+ {
+ char path[PATH_LEN], temp_path[PATH_LEN], trip_path[PATH_LEN], temp_high[12], trip[12];
+ double run_time = 30;
+ uint8_t sleep_time = 10;
+ int temp;
+ snprintf(path, PATH_LEN, "/sys/class/thermal/thermal_zone%d/", i);
+ strcpy(temp_path, path);
+ strcat(temp_path, "temp");
+ tst_res(TDEBUG, "Testing %s", temp_path);
+ SAFE_FILE_SCANF(temp_path, "%d", &temp);
+ if(temp < 0)
+ {
+ tst_brk(TBROK, "Unexpected zone temperature value %d", temp);
+ status = 0;
+ }
+ tst_res(TDEBUG, "Current temperature for %s: %d", path, temp);
+
+ snprintf(temp_high, sizeof(temp_high), "%d", temp + 10);
+
+ strcpy(trip_path, path);
+ strcat(trip_path, "trip_point_1_temp");
+
+ tst_res(TDEBUG, "Setting new trip_point_1_temp value: %s", temp_high);
+ SAFE_FILE_SCANF(trip_path, "%s", trip);
+ SAFE_FILE_PRINTF(trip_path, temp_high);
+
+ while(sleep_time > 0)
+ {
+ tst_res(TDEBUG, "Running for %f seconds, then sleeping for %d seconds", run_time, sleep_time);
+ pthread_t threads[nproc];
+ for (uint16_t j = 0; j < nproc; j++) pthread_create(&threads[j], NULL, cpu_workload, &run_time);
+ for (uint16_t j = 0; j < nproc; j++) pthread_join(threads[j], NULL);
+
+ SAFE_FILE_SCANF(temp_path, "%d", &temp);
+ tst_res(TDEBUG, "Temperature for %s after a test: %d", path, temp);
+
+ if(temp > atol(temp_high)) break;
+ sleep(sleep_time--);
+ run_time -= 3;
+ }
+ if(temp <= atol(temp_high))
+ {
+ tst_res(TINFO, "Zone temperature is not rising as expected");
+ status = 0;
+ }
+
+ tst_res(TDEBUG, "Restoring original trip_point_1_temp value: %s", trip);
+ SAFE_FILE_PRINTF(trip_path, trip);
+ }
+ }
+ read_interrupts(interrupt_later, nproc);
+
+ for(uint16_t 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 = {
+ .min_runtime = 180,
+ .needs_root = true,
+ .supported_archs = (const char *const []) {
+ "x86",
+ "x86_64",
+ NULL
+ },
+ .test_all = run
+};
--
2.47.3

---------------------------------------------------------------------
Intel Technology Poland sp. z o.o.
ul. Slowackiego 173 | 80-298 Gdansk | Sad Rejonowy Gdansk Polnoc | VII Wydzial Gospodarczy Krajowego Rejestru Sadowego - KRS 101882 | NIP 957-07-52-316 | Kapital zakladowy 200.000 PLN.
Spolka oswiadcza, ze posiada status duzego przedsiebiorcy w rozumieniu ustawy z dnia 8 marca 2013 r. o przeciwdzialaniu nadmiernym opoznieniom w transakcjach handlowych.

Ta wiadomosc wraz z zalacznikami jest przeznaczona dla okreslonego adresata i moze zawierac informacje poufne. W razie przypadkowego otrzymania tej wiadomosci, prosimy o powiadomienie nadawcy oraz trwale jej usuniecie; jakiekolwiek przegladanie lub rozpowszechnianie jest zabronione.
This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). If you are not the intended recipient, please contact the sender and delete all copies; any review or distribution by others is strictly prohibited.