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

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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: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Srinivas Pandruvada 2023-10-09 12:05:38 -07:00 committed by Rafael J. Wysocki
parent 0e50925392
commit d4d27e5a1a
3 changed files with 121 additions and 0 deletions
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1
tools/testing/selftests/Makefile
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@ -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))

12
tools/testing/selftests/thermal/intel/power_floor/Makefile Normal file
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@ -0,0 +1,12 @@
# 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

108
tools/testing/selftests/thermal/intel/power_floor/power_floor_test.c Normal file
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@ -0,0 +1,108 @@
// 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);
}
}