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/*
* Copyright (c) 2014-2018 Remy Noel.
* Copyright (c) 2014-2018 Richard Braun.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*
* This test checks the behavior of performance monitoring on a CPU.
* It creates a group with two events, cycle and instruction, and attaches
* that group to CPU1, where a thread is bound and runs a tight loop to
* make sure the target CPU is never idle. After some time, the measurement
* stops and values are reported.
*/
#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <kern/atomic.h>
#include <kern/clock.h>
#include <kern/cpumap.h>
#include <kern/error.h>
#include <kern/list.h>
#include <kern/log.h>
#include <kern/panic.h>
#include <kern/perfmon.h>
#include <kern/thread.h>
#include <machine/cpu.h>
#include <test/test.h>
#define TEST_WAIT_DELAY_MS 1000
/*
* Using another CPU than the BSP as the monitored CPU checks that PMUs are
* correctly initialized on APs.
*/
#define TEST_CONTROL_CPU 0
#define TEST_MONITORED_CPU (TEST_CONTROL_CPU + 1)
#define TEST_MIN_CPUS (TEST_MONITORED_CPU + 1)
#define TEST_EVENT_NAME_MAX_SIZE 32
struct test_event {
struct list node;
struct perfmon_event pm_event;
char name[TEST_EVENT_NAME_MAX_SIZE];
};
struct test_group {
struct list events;
};
static unsigned int test_run_stop;
static void
test_wait(void)
{
thread_delay(clock_ticks_from_ms(TEST_WAIT_DELAY_MS), false);
}
static void
test_event_init(struct test_event *event, unsigned int id, const char *name)
{
int error;
error = perfmon_event_init(&event->pm_event, id, PERFMON_EF_KERN);
error_check(error, "perfmon_event_init");
strlcpy(event->name, name, sizeof(event->name));
}
static void
test_event_report(struct test_event *event)
{
uint64_t count;
int error;
count = perfmon_event_read(&event->pm_event);
error = (count == 0) ? EINVAL : 0;
error_check(error, __func__);
log_info("test: %s: %llu", event->name, (unsigned long long)count);
}
static void
test_event_attach_cpu(struct test_event *event, unsigned int cpu)
{
int error;
error = perfmon_event_attach_cpu(&event->pm_event, cpu);
error_check(error, "perfmon_event_attach_cpu");
}
static void
test_event_detach(struct test_event *event)
{
int error;
error = perfmon_event_detach(&event->pm_event);
error_check(error, "perfmon_event_detach");
}
static void
test_group_init(struct test_group *group)
{
list_init(&group->events);
}
static void
test_group_add(struct test_group *group, struct test_event *event)
{
list_insert_tail(&group->events, &event->node);
}
static void
test_group_attach_cpu(struct test_group *group, unsigned int cpu)
{
struct test_event *event;
list_for_each_entry(&group->events, event, node) {
test_event_attach_cpu(event, cpu);
}
}
static void
test_group_detach(struct test_group *group)
{
struct test_event *event;
list_for_each_entry(&group->events, event, node) {
test_event_detach(event);
}
}
static void
test_group_report(struct test_group *group)
{
struct test_event *event;
list_for_each_entry(&group->events, event, node) {
test_event_report(event);
}
}
static void
test_run(void *arg)
{
unsigned int stop;
(void)arg;
do {
stop = atomic_load(&test_run_stop, ATOMIC_RELAXED);
} while (!stop);
}
static void
test_control(void *arg)
{
struct test_event cycle, instruction;
struct test_group group;
struct thread *thread;
thread = arg;
test_event_init(&cycle, PERFMON_EV_CYCLE, "cycle");
test_event_init(&instruction, PERFMON_EV_INSTRUCTION, "instruction");
test_group_init(&group);
test_group_add(&group, &cycle);
test_group_add(&group, &instruction);
test_group_attach_cpu(&group, TEST_MONITORED_CPU);
test_wait();
test_group_report(&group);
test_wait();
test_group_detach(&group);
test_group_report(&group);
atomic_store(&test_run_stop, 1, ATOMIC_RELAXED);
thread_join(thread);
log_info("test: done");
}
void
test_setup(void)
{
struct thread *thread;
struct thread_attr attr;
struct cpumap *cpumap;
int error;
if (cpu_count() < TEST_MIN_CPUS) {
panic("test: %u processors required", TEST_MIN_CPUS);
}
error = cpumap_create(&cpumap);
error_check(error, "cpumap_create");
thread_attr_init(&attr, THREAD_KERNEL_PREFIX "test_run");
cpumap_zero(cpumap);
cpumap_set(cpumap, TEST_MONITORED_CPU);
thread_attr_set_cpumap(&attr, cpumap);
error = thread_create(&thread, &attr, test_run, NULL);
error_check(error, "thread_create");
thread_attr_init(&attr, THREAD_KERNEL_PREFIX "test_control");
thread_attr_set_detached(&attr);
cpumap_zero(cpumap);
cpumap_set(cpumap, TEST_CONTROL_CPU);
thread_attr_set_cpumap(&attr, cpumap);
error = thread_create(NULL, &attr, test_control, thread);
error_check(error, "thread_create");
cpumap_destroy(cpumap);
}
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