1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *  zcrypt 2.1.0
4  *
5  *  Copyright IBM Corp. 2001, 2012
6  *  Author(s): Robert Burroughs
7  *	       Eric Rossman (edrossma@us.ibm.com)
8  *	       Cornelia Huck <cornelia.huck@de.ibm.com>
9  *
10  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
11  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
12  *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
13  *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
14  */
15 
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/interrupt.h>
19 #include <linux/miscdevice.h>
20 #include <linux/fs.h>
21 #include <linux/proc_fs.h>
22 #include <linux/seq_file.h>
23 #include <linux/compat.h>
24 #include <linux/slab.h>
25 #include <linux/atomic.h>
26 #include <linux/uaccess.h>
27 #include <linux/hw_random.h>
28 #include <linux/debugfs.h>
29 #include <asm/debug.h>
30 
31 #include "zcrypt_debug.h"
32 #include "zcrypt_api.h"
33 
34 #include "zcrypt_msgtype6.h"
35 #include "zcrypt_msgtype50.h"
36 
37 /*
38  * Device attributes common for all crypto card devices.
39  */
40 
41 static ssize_t zcrypt_card_type_show(struct device *dev,
42 				     struct device_attribute *attr, char *buf)
43 {
44 	struct zcrypt_card *zc = to_ap_card(dev)->private;
45 
46 	return snprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
47 }
48 
49 static DEVICE_ATTR(type, 0444, zcrypt_card_type_show, NULL);
50 
51 static ssize_t zcrypt_card_online_show(struct device *dev,
52 				       struct device_attribute *attr,
53 				       char *buf)
54 {
55 	struct zcrypt_card *zc = to_ap_card(dev)->private;
56 
57 	return snprintf(buf, PAGE_SIZE, "%d\n", zc->online);
58 }
59 
60 static ssize_t zcrypt_card_online_store(struct device *dev,
61 					struct device_attribute *attr,
62 					const char *buf, size_t count)
63 {
64 	struct zcrypt_card *zc = to_ap_card(dev)->private;
65 	struct zcrypt_queue *zq;
66 	int online, id;
67 
68 	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
69 		return -EINVAL;
70 
71 	zc->online = online;
72 	id = zc->card->id;
73 
74 	ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
75 
76 	spin_lock(&zcrypt_list_lock);
77 	list_for_each_entry(zq, &zc->zqueues, list)
78 		zcrypt_queue_force_online(zq, online);
79 	spin_unlock(&zcrypt_list_lock);
80 	return count;
81 }
82 
83 static DEVICE_ATTR(online, 0644, zcrypt_card_online_show,
84 		   zcrypt_card_online_store);
85 
86 static struct attribute *zcrypt_card_attrs[] = {
87 	&dev_attr_type.attr,
88 	&dev_attr_online.attr,
89 	NULL,
90 };
91 
92 static const struct attribute_group zcrypt_card_attr_group = {
93 	.attrs = zcrypt_card_attrs,
94 };
95 
96 struct zcrypt_card *zcrypt_card_alloc(void)
97 {
98 	struct zcrypt_card *zc;
99 
100 	zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
101 	if (!zc)
102 		return NULL;
103 	INIT_LIST_HEAD(&zc->list);
104 	INIT_LIST_HEAD(&zc->zqueues);
105 	kref_init(&zc->refcount);
106 	return zc;
107 }
108 EXPORT_SYMBOL(zcrypt_card_alloc);
109 
110 void zcrypt_card_free(struct zcrypt_card *zc)
111 {
112 	kfree(zc);
113 }
114 EXPORT_SYMBOL(zcrypt_card_free);
115 
116 static void zcrypt_card_release(struct kref *kref)
117 {
118 	struct zcrypt_card *zdev =
119 		container_of(kref, struct zcrypt_card, refcount);
120 	zcrypt_card_free(zdev);
121 }
122 
123 void zcrypt_card_get(struct zcrypt_card *zc)
124 {
125 	kref_get(&zc->refcount);
126 }
127 EXPORT_SYMBOL(zcrypt_card_get);
128 
129 int zcrypt_card_put(struct zcrypt_card *zc)
130 {
131 	return kref_put(&zc->refcount, zcrypt_card_release);
132 }
133 EXPORT_SYMBOL(zcrypt_card_put);
134 
135 /**
136  * zcrypt_card_register() - Register a crypto card device.
137  * @zc: Pointer to a crypto card device
138  *
139  * Register a crypto card device. Returns 0 if successful.
140  */
141 int zcrypt_card_register(struct zcrypt_card *zc)
142 {
143 	int rc;
144 
145 	rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
146 				&zcrypt_card_attr_group);
147 	if (rc)
148 		return rc;
149 
150 	spin_lock(&zcrypt_list_lock);
151 	list_add_tail(&zc->list, &zcrypt_card_list);
152 	spin_unlock(&zcrypt_list_lock);
153 
154 	zc->online = 1;
155 
156 	ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
157 
158 	return rc;
159 }
160 EXPORT_SYMBOL(zcrypt_card_register);
161 
162 /**
163  * zcrypt_card_unregister(): Unregister a crypto card device.
164  * @zc: Pointer to crypto card device
165  *
166  * Unregister a crypto card device.
167  */
168 void zcrypt_card_unregister(struct zcrypt_card *zc)
169 {
170 	ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
171 
172 	spin_lock(&zcrypt_list_lock);
173 	list_del_init(&zc->list);
174 	spin_unlock(&zcrypt_list_lock);
175 	sysfs_remove_group(&zc->card->ap_dev.device.kobj,
176 			   &zcrypt_card_attr_group);
177 }
178 EXPORT_SYMBOL(zcrypt_card_unregister);
179