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selftests/thermel/intel: Add test to read workload hint 

Some SoCs have in built firmware support to classify current running
workload and pass to OS for making power management decisions.

This test program waits for notification of workload type change
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 2023-08-28 17:23:46 -07:00 committed by Rafael J. Wysocki
parent e682b86211
commit 27801542b2
3 changed files with 170 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/workload_hint
TARGETS += timens
ifneq (1, $(quicktest))
TARGETS += timers

12
tools/testing/selftests/thermal/intel/workload_hint/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 := workload_hint_test
include ../../../lib.mk
endif
endif

157
tools/testing/selftests/thermal/intel/workload_hint/workload_hint_test.c Normal file
View File

@ -0,0 +1,157 @@
// 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 WORKLOAD_NOTIFICATION_DELAY_ATTRIBUTE "/sys/bus/pci/devices/0000:00:04.0/workload_hint/notification_delay_ms"
#define WORKLOAD_ENABLE_ATTRIBUTE "/sys/bus/pci/devices/0000:00:04.0/workload_hint/workload_hint_enable"
#define WORKLOAD_TYPE_INDEX_ATTRIBUTE "/sys/bus/pci/devices/0000:00:04.0/workload_hint/workload_type_index"
static const char * const workload_types[] = {
"idle",
"battery_life",
"sustained",
"bursty",
NULL
};
#define WORKLOAD_TYPE_MAX_INDEX 3
void workload_hint_exit(int signum)
{
int fd;
/* Disable feature via sysfs knob */
fd = open(WORKLOAD_ENABLE_ATTRIBUTE, O_RDWR);
if (fd < 0) {
perror("Unable to open workload type feature enable file\n");
exit(1);
}
if (write(fd, "0\n", 2) < 0) {
perror("Can' disable workload hints\n");
exit(1);
}
printf("Disabled workload type prediction\n");
close(fd);
}
int main(int argc, char **argv)
{
struct pollfd ufd;
char index_str[4];
int fd, ret, index;
char delay_str[64];
int delay = 0;
printf("Usage: workload_hint_test [notification delay in milli seconds]\n");
if (argc > 1) {
ret = sscanf(argv[1], "%d", &delay);
if (ret < 0) {
printf("Invalid delay\n");
exit(1);
}
printf("Setting notification delay to %d ms\n", delay);
if (delay < 0)
exit(1);
sprintf(delay_str, "%s\n", argv[1]);
sprintf(delay_str, "%s\n", argv[1]);
fd = open(WORKLOAD_NOTIFICATION_DELAY_ATTRIBUTE, O_RDWR);
if (fd < 0) {
perror("Unable to open workload notification delay\n");
exit(1);
}
if (write(fd, delay_str, strlen(delay_str)) < 0) {
perror("Can't set delay\n");
exit(1);
}
close(fd);
}
if (signal(SIGINT, workload_hint_exit) == SIG_IGN)
signal(SIGINT, SIG_IGN);
if (signal(SIGHUP, workload_hint_exit) == SIG_IGN)
signal(SIGHUP, SIG_IGN);
if (signal(SIGTERM, workload_hint_exit) == SIG_IGN)
signal(SIGTERM, SIG_IGN);
/* Enable feature via sysfs knob */
fd = open(WORKLOAD_ENABLE_ATTRIBUTE, O_RDWR);
if (fd < 0) {
perror("Unable to open workload type feature enable file\n");
exit(1);
}
if (write(fd, "1\n", 2) < 0) {
perror("Can' enable workload hints\n");
exit(1);
}
close(fd);
printf("Enabled workload type prediction\n");
while (1) {
fd = open(WORKLOAD_TYPE_INDEX_ATTRIBUTE, O_RDONLY);
if (fd < 0) {
perror("Unable to open workload type 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, index_str, sizeof(index_str)) < 0) {
fprintf(stderr, "Failed to read from:%s\n",
WORKLOAD_TYPE_INDEX_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, index_str, sizeof(index_str)) < 0)
exit(0);
ret = sscanf(index_str, "%d", &index);
if (ret < 0)
break;
if (index > WORKLOAD_TYPE_MAX_INDEX)
printf("Invalid workload type index\n");
else
printf("workload type:%s\n", workload_types[index]);
}
close(fd);
}
}