[LTP] [PATCH v18] thermal: add new test group

[Piotr Kubaj <piotr.kubaj@intel.com>]

Currently consists of only one test for the CPU package thermal sensor
interface for Intel platforms.
It 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.

Signed-off-by: Piotr Kubaj <piotr.kubaj@intel.com>
---
Fix compilation, needs_drivers was removed so switch to needs_kconfigs.
 runtest/thermal                               |   3 +
 testcases/kernel/Makefile                     |   1 +
 testcases/kernel/thermal/.gitignore           |   1 +
 testcases/kernel/thermal/Makefile             |   9 +
 .../kernel/thermal/thermal_interrupt_events.c | 242 ++++++++++++++++++
 5 files changed, 256 insertions(+)
 create mode 100644 runtest/thermal
 create mode 100644 testcases/kernel/thermal/.gitignore
 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/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/.gitignore b/testcases/kernel/thermal/.gitignore
new file mode 100644
index 000000000..1090bdad8
--- /dev/null
+++ b/testcases/kernel/thermal/.gitignore
@@ -0,0 +1 @@
+thermal_interrupt_events
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..1f24c3ae4
--- /dev/null
+++ b/testcases/kernel/thermal/thermal_interrupt_events.c
@@ -0,0 +1,242 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 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 <ctype.h>
+#include <inttypes.h>
+#include "tst_safe_stdio.h"
+#include "tst_test.h"
+#include "tst_timer_test.h"
+
+#define	TEST_RUNTIME	3
+#define	RUNTIME		30
+#define	SLEEP		10
+#define	TEMP_INCREMENT	10
+
+static bool x86_pkg_temp_tz_found, *x86_pkg_temp_tz;
+static char temp_path[PATH_MAX], trip_path[PATH_MAX];
+static int nproc, temp_high, temp, *trip_orig, tz_counter;
+static uint64_t *interrupt_init, *interrupt_later;
+
+static void read_interrupts(uint64_t *interrupts)
+{
+	bool interrupts_found = false;
+	char line[8192];
+
+	memset(interrupts, 0, nproc * sizeof(*interrupts));
+	FILE *fp = SAFE_FOPEN("/proc/interrupts", "r");
+
+	while (fgets(line, sizeof(line), fp)) {
+		if (!strstr(line, "Thermal event interrupts"))
+			continue;
+
+		interrupts_found = true;
+		char *ptr = strchr(line, ':');
+
+		for (int i = 0; i < nproc; i++) {
+			char *endptr;
+
+			while (*ptr && !isdigit(*ptr))
+				ptr++;
+
+			errno = 0;
+
+			interrupts[i] = strtoull(ptr, &endptr, 10);
+
+			if (ptr == endptr)
+				tst_brk(TBROK, "CPU %d: interrupt not found", i);
+
+			if (errno == ERANGE)
+				tst_brk(TBROK, "CPU %d: interrupt out of range", i);
+
+			ptr = endptr;
+			tst_res(TDEBUG, "interrupts[%d]: %" PRIu64, i, interrupts[i]);
+		}
+		break;
+	}
+	SAFE_FCLOSE(fp);
+	if (!interrupts_found)
+		tst_brk(TCONF, "No Thermal event interrupts line in /proc/interrupts");
+}
+
+static void setup(void)
+{
+	char line[8192];
+
+	nproc = tst_ncpus();
+	tst_set_runtime(nproc * TEST_RUNTIME);
+
+	tst_res(TDEBUG, "Number of logical cores: %d", nproc);
+	interrupt_init = SAFE_CALLOC(nproc, sizeof(uint64_t));
+	interrupt_later = SAFE_CALLOC(nproc, sizeof(uint64_t));
+
+	DIR *dir = SAFE_OPENDIR("/sys/class/thermal/");
+	struct dirent *entry;
+
+	while ((entry = SAFE_READDIR(dir))) {
+		if ((!strncmp(entry->d_name, "thermal_zone", sizeof("thermal_zone") - 1)))
+			tz_counter++;
+	}
+	SAFE_CLOSEDIR(dir);
+	tst_res(TDEBUG, "Found %d thermal zone(s)", tz_counter);
+
+	x86_pkg_temp_tz = SAFE_CALLOC(tz_counter, sizeof(bool));
+	trip_orig = SAFE_CALLOC(tz_counter, sizeof(int));
+
+	for (int i = 0; i < tz_counter; i++) {
+		char path[PATH_MAX];
+
+		snprintf(path, PATH_MAX, "/sys/class/thermal/thermal_zone%d/type", i);
+		tst_res(TDEBUG, "Checking whether %s is x86_pkg_temp", path);
+
+		SAFE_FILE_SCANF(path, "%8191s", line);
+		if (strstr(line, "x86_pkg_temp")) {
+			tst_res(TDEBUG, "Thermal zone %d uses x86_pkg_temp", i);
+			x86_pkg_temp_tz[i] = true;
+			x86_pkg_temp_tz_found = true;
+			snprintf(trip_path, PATH_MAX, "/sys/class/thermal/thermal_zone%d/trip_point_1_temp", i);
+			SAFE_ACCESS(trip_path, R_OK | W_OK);
+			SAFE_FILE_SCANF(trip_path, "%d", &trip_orig[i]);
+		}
+	}
+
+	if (!x86_pkg_temp_tz_found)
+		tst_brk(TCONF, "No thermal zone uses x86_pkg_temp");
+}
+
+static void cpu_workload(double run_time)
+{
+	tst_timer_start(CLOCK_MONOTONIC);
+	int num = 2;
+
+	while (!tst_timer_expired_ms(run_time * 1000)) {
+		for (int i = 2; i * i <= num; i++) {
+			if (num % i == 0)
+				break;
+		}
+		num++;
+		SAFE_FILE_SCANF(temp_path, "%d", &temp);
+
+		if (temp > temp_high)
+			break;
+	}
+}
+
+static void test_zone(int i)
+{
+	int sleep_time = SLEEP;
+	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);
+
+	tst_res(TDEBUG, "Current temperature for %s: %d", temp_path, temp);
+
+	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);
+
+	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);
+			}
+		}
+
+		tst_reap_children();
+
+		SAFE_FILE_SCANF(temp_path, "%d", &temp);
+		tst_res(TDEBUG, "Temperature for %s after a test: %d", temp_path, temp);
+
+		if (temp > temp_high)
+			break;
+		sleep(sleep_time--);
+		run_time -= 3;
+	}
+}
+
+static void cleanup(void)
+{
+	if (x86_pkg_temp_tz_found) {
+		for (int i = 0; i < tz_counter; i++) {
+			if (x86_pkg_temp_tz[i]) {
+				snprintf(trip_path, PATH_MAX, "/sys/class/thermal/thermal_zone%d/trip_point_1_temp", i);
+				SAFE_FILE_PRINTF(trip_path, "%d", trip_orig[i]);
+			}
+		}
+	}
+
+	free(x86_pkg_temp_tz);
+	free(interrupt_init);
+	free(interrupt_later);
+	free(trip_orig);
+}
+
+static void run(void)
+{
+	for (int i = 0; i < tz_counter; i++) {
+		if (x86_pkg_temp_tz[i]) {
+			read_interrupts(interrupt_init);
+			test_zone(i);
+			read_interrupts(interrupt_later);
+
+			bool interrupt_increased = false;
+			for (int j = 0; j < nproc; j++) {
+				if (interrupt_later[j] > interrupt_init[j]) {
+					interrupt_increased = true;
+					tst_res(TINFO, "CPU %d interrupt counter: %" PRIu64 " (previous: %" PRIu64 ")",
+						j, interrupt_later[j], interrupt_init[j]);
+				}
+			}
+
+			if (!interrupt_increased)
+				tst_res(TFAIL, "No thermal interrupt increase detected");
+			else if (temp <= temp_high)
+				tst_res(TFAIL, "Thermal interrupts increased but temperature did not rise as expected");
+			else
+				tst_res(TPASS, "x86 package thermal interrupt triggered");
+		}
+	}
+}
+
+static struct tst_test test = {
+	.cleanup = cleanup,
+	.forks_child = 1,
+	.needs_kconfigs = (const char *const []) {
+		"CONFIG_X86_PKG_TEMP_THERMAL",
+		NULL
+	},
+	.min_runtime = 5,
+	.needs_root = 1,
+	.setup = setup,
+	.supported_archs = (const char *const []) {
+		"x86",
+		"x86_64",
+		NULL
+	},
+	.tags = (const struct tst_tag[]) {
+		{"linux-git", "9635c586a559ba0e45b2bfbff79c937ddbaf1a62"},
+		{}
+	},
+	.test_all = run
+};
-- 
2.47.3

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