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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2014 Google, Inc.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/hrtimer.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/time.h>
#include <linux/numa.h>
#include <linux/nodemask.h>
#include <linux/topology.h>
#define TEST_PROBE_DELAY (5 * 1000) /* 5 sec */
#define TEST_PROBE_THRESHOLD (TEST_PROBE_DELAY / 2)
static atomic_t warnings, errors, timeout, async_completed;
static int test_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
/*
* Determine if we have hit the "timeout" limit for the test if we
* have then report it as an error, otherwise we wil sleep for the
* required amount of time and then report completion.
*/
if (atomic_read(&timeout)) {
dev_err(dev, "async probe took too long\n");
atomic_inc(&errors);
} else {
dev_dbg(&pdev->dev, "sleeping for %d msecs in probe\n",
TEST_PROBE_DELAY);
msleep(TEST_PROBE_DELAY);
dev_dbg(&pdev->dev, "done sleeping\n");
}
/*
* Report NUMA mismatch if device node is set and we are not
* performing an async init on that node.
*/
if (dev->driver->probe_type == PROBE_PREFER_ASYNCHRONOUS) {
if (dev_to_node(dev) != numa_node_id()) {
dev_warn(dev, "NUMA node mismatch %d != %d\n",
dev_to_node(dev), numa_node_id());
atomic_inc(&warnings);
}
atomic_inc(&async_completed);
}
return 0;
}
static struct platform_driver async_driver = {
.driver = {
.name = "test_async_driver",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
},
.probe = test_probe,
};
static struct platform_driver sync_driver = {
.driver = {
.name = "test_sync_driver",
.probe_type = PROBE_FORCE_SYNCHRONOUS,
},
.probe = test_probe,
};
static struct platform_device *async_dev[NR_CPUS * 2];
static struct platform_device *sync_dev[2];
static struct platform_device *
test_platform_device_register_node(char *name, int id, int nid)
{
struct platform_device *pdev;
int ret;
pdev = platform_device_alloc(name, id);
if (!pdev)
return NULL;
if (nid != NUMA_NO_NODE)
set_dev_node(&pdev->dev, nid);
ret = platform_device_add(pdev);
if (ret) {
platform_device_put(pdev);
return ERR_PTR(ret);
}
return pdev;
}
static int __init test_async_probe_init(void)
{
struct platform_device **pdev = NULL;
int async_id = 0, sync_id = 0;
unsigned long long duration;
ktime_t calltime, delta;
int err, nid, cpu;
pr_info("registering first set of asynchronous devices...\n");
for_each_online_cpu(cpu) {
nid = cpu_to_node(cpu);
pdev = &async_dev[async_id];
*pdev = test_platform_device_register_node("test_async_driver",
async_id,
nid);
if (IS_ERR(*pdev)) {
err = PTR_ERR(*pdev);
*pdev = NULL;
pr_err("failed to create async_dev: %d\n", err);
goto err_unregister_async_devs;
}
async_id++;
}
pr_info("registering asynchronous driver...\n");
calltime = ktime_get();
err = platform_driver_register(&async_driver);
if (err) {
pr_err("Failed to register async_driver: %d\n", err);
goto err_unregister_async_devs;
}
delta = ktime_sub(ktime_get(), calltime);
duration = (unsigned long long) ktime_to_ms(delta);
pr_info("registration took %lld msecs\n", duration);
if (duration > TEST_PROBE_THRESHOLD) {
pr_err("test failed: probe took too long\n");
err = -ETIMEDOUT;
goto err_unregister_async_driver;
}
pr_info("registering second set of asynchronous devices...\n");
calltime = ktime_get();
for_each_online_cpu(cpu) {
nid = cpu_to_node(cpu);
pdev = &sync_dev[sync_id];
*pdev = test_platform_device_register_node("test_async_driver",
async_id,
nid);
if (IS_ERR(*pdev)) {
err = PTR_ERR(*pdev);
*pdev = NULL;
pr_err("failed to create async_dev: %d\n", err);
goto err_unregister_async_driver;
}
async_id++;
}
delta = ktime_sub(ktime_get(), calltime);
duration = (unsigned long long) ktime_to_ms(delta);
dev_info(&(*pdev)->dev,
"registration took %lld msecs\n", duration);
if (duration > TEST_PROBE_THRESHOLD) {
dev_err(&(*pdev)->dev,
"test failed: probe took too long\n");
err = -ETIMEDOUT;
goto err_unregister_async_driver;
}
pr_info("registering first synchronous device...\n");
nid = cpu_to_node(cpu);
pdev = &sync_dev[sync_id];
*pdev = test_platform_device_register_node("test_sync_driver",
sync_id,
NUMA_NO_NODE);
if (IS_ERR(*pdev)) {
err = PTR_ERR(*pdev);
*pdev = NULL;
pr_err("failed to create sync_dev: %d\n", err);
goto err_unregister_async_driver;
}
sync_id++;
pr_info("registering synchronous driver...\n");
calltime = ktime_get();
err = platform_driver_register(&sync_driver);
if (err) {
pr_err("Failed to register async_driver: %d\n", err);
goto err_unregister_sync_devs;
}
delta = ktime_sub(ktime_get(), calltime);
duration = (unsigned long long) ktime_to_ms(delta);
pr_info("registration took %lld msecs\n", duration);
if (duration < TEST_PROBE_THRESHOLD) {
dev_err(&(*pdev)->dev,
"test failed: probe was too quick\n");
err = -ETIMEDOUT;
goto err_unregister_sync_driver;
}
pr_info("registering second synchronous device...\n");
pdev = &sync_dev[sync_id];
calltime = ktime_get();
*pdev = test_platform_device_register_node("test_sync_driver",
sync_id,
NUMA_NO_NODE);
if (IS_ERR(*pdev)) {
err = PTR_ERR(*pdev);
*pdev = NULL;
pr_err("failed to create sync_dev: %d\n", err);
goto err_unregister_sync_driver;
}
sync_id++;
delta = ktime_sub(ktime_get(), calltime);
duration = (unsigned long long) ktime_to_ms(delta);
dev_info(&(*pdev)->dev,
"registration took %lld msecs\n", duration);
if (duration < TEST_PROBE_THRESHOLD) {
dev_err(&(*pdev)->dev,
"test failed: probe was too quick\n");
err = -ETIMEDOUT;
goto err_unregister_sync_driver;
}
/*
* The async events should have completed while we were taking care
* of the synchronous events. We will now terminate any outstanding
* asynchronous probe calls remaining by forcing timeout and remove
* the driver before we return which should force the flush of the
* pending asynchronous probe calls.
*
* Otherwise if they completed without errors or warnings then
* report successful completion.
*/
if (atomic_read(&async_completed) != async_id) {
pr_err("async events still pending, forcing timeout\n");
atomic_inc(&timeout);
err = -ETIMEDOUT;
} else if (!atomic_read(&errors) && !atomic_read(&warnings)) {
pr_info("completed successfully\n");
return 0;
}
err_unregister_sync_driver:
platform_driver_unregister(&sync_driver);
err_unregister_sync_devs:
while (sync_id--)
platform_device_unregister(sync_dev[sync_id]);
err_unregister_async_driver:
platform_driver_unregister(&async_driver);
err_unregister_async_devs:
while (async_id--)
platform_device_unregister(async_dev[async_id]);
/*
* If err is already set then count that as an additional error for
* the test. Otherwise we will report an invalid argument error and
* not count that as we should have reached here as a result of
* errors or warnings being reported by the probe routine.
*/
if (err)
atomic_inc(&errors);
else
err = -EINVAL;
pr_err("Test failed with %d errors and %d warnings\n",
atomic_read(&errors), atomic_read(&warnings));
return err;
}
module_init(test_async_probe_init);
static void __exit test_async_probe_exit(void)
{
int id = 2;
platform_driver_unregister(&async_driver);
platform_driver_unregister(&sync_driver);
while (id--)
platform_device_unregister(sync_dev[id]);
id = NR_CPUS * 2;
while (id--)
platform_device_unregister(async_dev[id]);
}
module_exit(test_async_probe_exit);
MODULE_DESCRIPTION("Test module for asynchronous driver probing");
MODULE_AUTHOR("Dmitry Torokhov <dtor@chromium.org>");
MODULE_LICENSE("GPL");