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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright(c) 2022 Intel Corporation. */
#include <linux/cpu.h>
#include <linux/delay.h>
#include <linux/fs.h>
#include <linux/semaphore.h>
#include <linux/slab.h>
#include "ifs.h"
/*
* Protects against simultaneous tests on multiple cores, or
* reloading can file while a test is in progress
*/
static DEFINE_SEMAPHORE(ifs_sem);
/*
* The sysfs interface to check additional details of last test
* cat /sys/devices/system/platform/ifs/details
*/
static ssize_t details_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ifs_data *ifsd = ifs_get_data(dev);
return sysfs_emit(buf, "%#llx\n", ifsd->scan_details);
}
static DEVICE_ATTR_RO(details);
static const char * const status_msg[] = {
[SCAN_NOT_TESTED] = "untested",
[SCAN_TEST_PASS] = "pass",
[SCAN_TEST_FAIL] = "fail"
};
/*
* The sysfs interface to check the test status:
* To check the status of last test
* cat /sys/devices/platform/ifs/status
*/
static ssize_t status_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct ifs_data *ifsd = ifs_get_data(dev);
return sysfs_emit(buf, "%s\n", status_msg[ifsd->status]);
}
static DEVICE_ATTR_RO(status);
/*
* The sysfs interface for single core testing
* To start test, for example, cpu5
* echo 5 > /sys/devices/platform/ifs/run_test
* To check the result:
* cat /sys/devices/platform/ifs/result
* The sibling core gets tested at the same time.
*/
static ssize_t run_test_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct ifs_data *ifsd = ifs_get_data(dev);
unsigned int cpu;
int rc;
rc = kstrtouint(buf, 0, &cpu);
if (rc < 0 || cpu >= nr_cpu_ids)
return -EINVAL;
if (down_interruptible(&ifs_sem))
return -EINTR;
if (!ifsd->loaded)
rc = -EPERM;
else
rc = do_core_test(cpu, dev);
up(&ifs_sem);
return rc ? rc : count;
}
static DEVICE_ATTR_WO(run_test);
/*
* Display currently loaded IFS image version.
*/
static ssize_t image_version_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ifs_data *ifsd = ifs_get_data(dev);
if (!ifsd->loaded)
return sysfs_emit(buf, "%s\n", "none");
else
return sysfs_emit(buf, "%#x\n", ifsd->loaded_version);
}
static DEVICE_ATTR_RO(image_version);
/* global scan sysfs attributes */
static struct attribute *plat_ifs_attrs[] = {
&dev_attr_details.attr,
&dev_attr_status.attr,
&dev_attr_run_test.attr,
&dev_attr_image_version.attr,
NULL
};
ATTRIBUTE_GROUPS(plat_ifs);
const struct attribute_group **ifs_get_groups(void)
{
return plat_ifs_groups;
}
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