Commit d4d27e5a authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Rafael J. Wysocki
Browse files

selftests/thermel/intel: Add test to read power floor status 



Some SoCs have firmware support to notify, if the system can't lower
power limit to a value requested from user space via RAPL constraints.

This test program waits for notification of power floor and prints. This
program can be used to test this feature and also allows other user space
programs to use as a reference.

Signed-off-by: default avatarSrinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 0e509253

tools/testing/selftests/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ TARGETS += syscall_user_dispatch 
TARGETS += sysctl

TARGETS += tc-testing

TARGETS += tdx

TARGETS += thermal/intel/power_floor

TARGETS += thermal/intel/workload_hint

TARGETS += timens

ifneq (1, $(quicktest))

tools/testing/selftests/thermal/intel/power_floor/Makefile

0 → 100644
+12 −0
Original line number Diff line number Diff line 
# SPDX-License-Identifier: GPL-2.0

ifndef CROSS_COMPILE

uname_M := $(shell uname -m 2>/dev/null || echo not)

ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)



ifeq ($(ARCH),x86)

TEST_GEN_PROGS := power_floor_test



include ../../../lib.mk



endif

endif

tools/testing/selftests/thermal/intel/power_floor/power_floor_test.c

0 → 100644
+108 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0



#define _GNU_SOURCE



#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include <fcntl.h>

#include <poll.h>

#include <signal.h>



#define POWER_FLOOR_ENABLE_ATTRIBUTE "/sys/bus/pci/devices/0000:00:04.0/power_limits/power_floor_enable"

#define POWER_FLOOR_STATUS_ATTRIBUTE  "/sys/bus/pci/devices/0000:00:04.0/power_limits/power_floor_status"



void power_floor_exit(int signum)

{

	int fd;



	/* Disable feature via sysfs knob */



	fd = open(POWER_FLOOR_ENABLE_ATTRIBUTE, O_RDWR);

	if (fd < 0) {

		perror("Unable to open power floor enable file\n");

		exit(1);

	}



	if (write(fd, "0\n", 2) < 0) {

		perror("Can' disable power floor notifications\n");

		exit(1);

	}



	printf("Disabled power floor notifications\n");



	close(fd);

}



int main(int argc, char **argv)

{

	struct pollfd ufd;

	char status_str[3];

	int fd, ret;



	if (signal(SIGINT, power_floor_exit) == SIG_IGN)

		signal(SIGINT, SIG_IGN);

	if (signal(SIGHUP, power_floor_exit) == SIG_IGN)

		signal(SIGHUP, SIG_IGN);

	if (signal(SIGTERM, power_floor_exit) == SIG_IGN)

		signal(SIGTERM, SIG_IGN);



	/* Enable feature via sysfs knob */

	fd = open(POWER_FLOOR_ENABLE_ATTRIBUTE, O_RDWR);

	if (fd < 0) {

		perror("Unable to open power floor enable file\n");

		exit(1);

	}



	if (write(fd, "1\n", 2) < 0) {

		perror("Can' enable power floor notifications\n");

		exit(1);

	}



	close(fd);



	printf("Enabled power floor notifications\n");



	while (1) {

		fd = open(POWER_FLOOR_STATUS_ATTRIBUTE, O_RDONLY);

		if (fd < 0) {

			perror("Unable to power floor status file\n");

			exit(1);

		}



		if ((lseek(fd, 0L, SEEK_SET)) < 0) {

			fprintf(stderr, "Failed to set pointer to beginning\n");

			exit(1);

		}



		if (read(fd, status_str, sizeof(status_str)) < 0) {

			fprintf(stderr, "Failed to read from:%s\n",

			POWER_FLOOR_STATUS_ATTRIBUTE);

			exit(1);

		}



		ufd.fd = fd;

		ufd.events = POLLPRI;



		ret = poll(&ufd, 1, -1);

		if (ret < 0) {

			perror("poll error");

			exit(1);

		} else if (ret == 0) {

			printf("Poll Timeout\n");

		} else {

			if ((lseek(fd, 0L, SEEK_SET)) < 0) {

				fprintf(stderr, "Failed to set pointer to beginning\n");

				exit(1);

			}



			if (read(fd, status_str, sizeof(status_str)) < 0)

				exit(0);



			printf("power floor status: %s\n", status_str);

		}



		close(fd);

	}

}