1// SPDX-License-Identifier: GPL-2.0-only
  2/* Copyright(c) 2022 Intel Corporation. */
  3
  4#include <linux/cpu.h>
  5#include <linux/delay.h>
  6#include <linux/fs.h>
  7#include <linux/semaphore.h>
  8#include <linux/slab.h>
  9
 10#include "ifs.h"
 11
 12/*
 13 * Protects against simultaneous tests on multiple cores, or
 14 * reloading can file while a test is in progress
 15 */
 16static DEFINE_SEMAPHORE(ifs_sem, 1);
 17
 18/*
 19 * The sysfs interface to check additional details of last test
 20 * cat /sys/devices/system/platform/ifs/details
 21 */
 22static ssize_t details_show(struct device *dev,
 23			    struct device_attribute *attr,
 24			    char *buf)
 25{
 26	struct ifs_data *ifsd = ifs_get_data(dev);
 27
 28	return sysfs_emit(buf, "%#llx\n", ifsd->scan_details);
 29}
 30
 31static DEVICE_ATTR_RO(details);
 32
 33static const char * const status_msg[] = {
 34	[SCAN_NOT_TESTED] = "untested",
 35	[SCAN_TEST_PASS] = "pass",
 36	[SCAN_TEST_FAIL] = "fail"
 37};
 38
 39/*
 40 * The sysfs interface to check the test status:
 41 * To check the status of last test
 42 * cat /sys/devices/platform/ifs/status
 43 */
 44static ssize_t status_show(struct device *dev,
 45			   struct device_attribute *attr,
 46			   char *buf)
 47{
 48	struct ifs_data *ifsd = ifs_get_data(dev);
 49
 50	return sysfs_emit(buf, "%s\n", status_msg[ifsd->status]);
 51}
 52
 53static DEVICE_ATTR_RO(status);
 54
 55/*
 56 * The sysfs interface for single core testing
 57 * To start test, for example, cpu5
 58 * echo 5 > /sys/devices/platform/ifs/run_test
 59 * To check the result:
 60 * cat /sys/devices/platform/ifs/result
 61 * The sibling core gets tested at the same time.
 62 */
 63static ssize_t run_test_store(struct device *dev,
 64			      struct device_attribute *attr,
 65			      const char *buf, size_t count)
 66{
 67	unsigned int cpu;
 68	int rc;
 69
 70	rc = kstrtouint(buf, 0, &cpu);
 71	if (rc < 0 || cpu >= nr_cpu_ids)
 72		return -EINVAL;
 73
 74	if (down_interruptible(&ifs_sem))
 75		return -EINTR;
 76
 77	rc = do_core_test(cpu, dev);
 78
 79	up(&ifs_sem);
 80
 81	return rc ? rc : count;
 82}
 83
 84static DEVICE_ATTR_WO(run_test);
 85
 86static ssize_t current_batch_store(struct device *dev,
 87				   struct device_attribute *attr,
 88				   const char *buf, size_t count)
 89{
 90	struct ifs_data *ifsd = ifs_get_data(dev);
 91	unsigned int cur_batch;
 92	int rc;
 93
 94	rc = kstrtouint(buf, 0, &cur_batch);
 95	if (rc < 0 || cur_batch > 0xff)
 96		return -EINVAL;
 97
 98	if (down_interruptible(&ifs_sem))
 99		return -EINTR;
100
101	ifsd->cur_batch = cur_batch;
102
103	rc = ifs_load_firmware(dev);
104
105	up(&ifs_sem);
106
107	return (rc == 0) ? count : rc;
108}
109
110static ssize_t current_batch_show(struct device *dev,
111				  struct device_attribute *attr, char *buf)
112{
113	struct ifs_data *ifsd = ifs_get_data(dev);
114
115	if (!ifsd->loaded)
116		return sysfs_emit(buf, "none\n");
117	else
118		return sysfs_emit(buf, "0x%02x\n", ifsd->cur_batch);
119}
120
121static DEVICE_ATTR_RW(current_batch);
122
123/*
124 * Display currently loaded IFS image version.
125 */
126static ssize_t image_version_show(struct device *dev,
127				  struct device_attribute *attr, char *buf)
128{
129	struct ifs_data *ifsd = ifs_get_data(dev);
130
131	if (!ifsd->loaded)
132		return sysfs_emit(buf, "%s\n", "none");
133	else
134		return sysfs_emit(buf, "%#x\n", ifsd->loaded_version);
135}
136
137static DEVICE_ATTR_RO(image_version);
138
139/* global scan sysfs attributes */
140struct attribute *plat_ifs_attrs[] = {
141	&dev_attr_details.attr,
142	&dev_attr_status.attr,
143	&dev_attr_run_test.attr,
144	&dev_attr_current_batch.attr,
145	&dev_attr_image_version.attr,
146	NULL
147};
148
149/* global array sysfs attributes */
150struct attribute *plat_ifs_array_attrs[] = {
151	&dev_attr_details.attr,
152	&dev_attr_status.attr,
153	&dev_attr_run_test.attr,
154	NULL
155};