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