1// SPDX-License-Identifier: GPL-2.0+
2/*
3 *  Copyright IBM Corp. 2001, 2012
4 *  Author(s): Robert Burroughs
5 *	       Eric Rossman (edrossma@us.ibm.com)
6 *	       Cornelia Huck <cornelia.huck@de.ibm.com>
7 *
8 *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
9 *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
11 *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
12 */
13
14#include <linux/module.h>
15#include <linux/init.h>
16#include <linux/interrupt.h>
17#include <linux/miscdevice.h>
18#include <linux/fs.h>
19#include <linux/proc_fs.h>
20#include <linux/seq_file.h>
21#include <linux/compat.h>
22#include <linux/slab.h>
23#include <linux/atomic.h>
24#include <linux/uaccess.h>
25#include <linux/hw_random.h>
26#include <linux/debugfs.h>
27#include <asm/debug.h>
28
29#include "zcrypt_debug.h"
30#include "zcrypt_api.h"
31
32#include "zcrypt_msgtype6.h"
33#include "zcrypt_msgtype50.h"
34
35/*
36 * Device attributes common for all crypto card devices.
37 */
38
39static ssize_t type_show(struct device *dev,
40			 struct device_attribute *attr, char *buf)
41{
42	struct zcrypt_card *zc = to_ap_card(dev)->private;
43
44	return scnprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
45}
46
47static DEVICE_ATTR_RO(type);
48
49static ssize_t online_show(struct device *dev,
50			   struct device_attribute *attr,
51			   char *buf)
52{
53	struct ap_card *ac = to_ap_card(dev);
54	struct zcrypt_card *zc = ac->private;
55	int online = ac->config && zc->online ? 1 : 0;
56
57	return scnprintf(buf, PAGE_SIZE, "%d\n", online);
58}
59
60static ssize_t online_store(struct device *dev,
61			    struct device_attribute *attr,
62			    const char *buf, size_t count)
63{
64	struct ap_card *ac = to_ap_card(dev);
65	struct zcrypt_card *zc = ac->private;
66	struct zcrypt_queue *zq;
67	int online, id;
68
69	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
70		return -EINVAL;
71
72	if (online && !ac->config)
73		return -ENODEV;
74
75	zc->online = online;
76	id = zc->card->id;
77
78	ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
79
80	spin_lock(&zcrypt_list_lock);
81	list_for_each_entry(zq, &zc->zqueues, list)
82		zcrypt_queue_force_online(zq, online);
83	spin_unlock(&zcrypt_list_lock);
84	return count;
85}
86
87static DEVICE_ATTR_RW(online);
88
89static ssize_t load_show(struct device *dev,
90			 struct device_attribute *attr,
91			 char *buf)
92{
93	struct zcrypt_card *zc = to_ap_card(dev)->private;
94
95	return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zc->load));
96}
97
98static DEVICE_ATTR_RO(load);
99
100static struct attribute *zcrypt_card_attrs[] = {
101	&dev_attr_type.attr,
102	&dev_attr_online.attr,
103	&dev_attr_load.attr,
104	NULL,
105};
106
107static const struct attribute_group zcrypt_card_attr_group = {
108	.attrs = zcrypt_card_attrs,
109};
110
111struct zcrypt_card *zcrypt_card_alloc(void)
112{
113	struct zcrypt_card *zc;
114
115	zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
116	if (!zc)
117		return NULL;
118	INIT_LIST_HEAD(&zc->list);
119	INIT_LIST_HEAD(&zc->zqueues);
120	kref_init(&zc->refcount);
121	return zc;
122}
123EXPORT_SYMBOL(zcrypt_card_alloc);
124
125void zcrypt_card_free(struct zcrypt_card *zc)
126{
127	kfree(zc);
128}
129EXPORT_SYMBOL(zcrypt_card_free);
130
131static void zcrypt_card_release(struct kref *kref)
132{
133	struct zcrypt_card *zdev =
134		container_of(kref, struct zcrypt_card, refcount);
135	zcrypt_card_free(zdev);
136}
137
138void zcrypt_card_get(struct zcrypt_card *zc)
139{
140	kref_get(&zc->refcount);
141}
142EXPORT_SYMBOL(zcrypt_card_get);
143
144int zcrypt_card_put(struct zcrypt_card *zc)
145{
146	return kref_put(&zc->refcount, zcrypt_card_release);
147}
148EXPORT_SYMBOL(zcrypt_card_put);
149
150/**
151 * zcrypt_card_register() - Register a crypto card device.
152 * @zc: Pointer to a crypto card device
153 *
154 * Register a crypto card device. Returns 0 if successful.
155 */
156int zcrypt_card_register(struct zcrypt_card *zc)
157{
158	int rc;
159
160	spin_lock(&zcrypt_list_lock);
161	list_add_tail(&zc->list, &zcrypt_card_list);
162	spin_unlock(&zcrypt_list_lock);
163
164	zc->online = 1;
165
166	ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
167
168	rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
169				&zcrypt_card_attr_group);
170	if (rc) {
171		spin_lock(&zcrypt_list_lock);
172		list_del_init(&zc->list);
173		spin_unlock(&zcrypt_list_lock);
174	}
175
176	return rc;
177}
178EXPORT_SYMBOL(zcrypt_card_register);
179
180/**
181 * zcrypt_card_unregister(): Unregister a crypto card device.
182 * @zc: Pointer to crypto card device
183 *
184 * Unregister a crypto card device.
185 */
186void zcrypt_card_unregister(struct zcrypt_card *zc)
187{
188	ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
189
190	spin_lock(&zcrypt_list_lock);
191	list_del_init(&zc->list);
192	spin_unlock(&zcrypt_list_lock);
193	sysfs_remove_group(&zc->card->ap_dev.device.kobj,
194			   &zcrypt_card_attr_group);
195	zcrypt_card_put(zc);
196}
197EXPORT_SYMBOL(zcrypt_card_unregister);
198