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/export.h>
15 #include <linux/module.h>
16 #include <linux/init.h>
17 #include <linux/interrupt.h>
18 #include <linux/miscdevice.h>
19 #include <linux/fs.h>
20 #include <linux/proc_fs.h>
21 #include <linux/seq_file.h>
22 #include <linux/compat.h>
23 #include <linux/slab.h>
24 #include <linux/atomic.h>
25 #include <linux/uaccess.h>
26 #include <linux/hw_random.h>
27 #include <linux/debugfs.h>
28 #include <asm/debug.h>
29
30 #include "zcrypt_debug.h"
31 #include "zcrypt_api.h"
32
33 #include "zcrypt_msgtype6.h"
34 #include "zcrypt_msgtype50.h"
35
36 /*
37 * Device attributes common for all crypto card devices.
38 */
39
type_show(struct device * dev,struct device_attribute * attr,char * buf)40 static ssize_t type_show(struct device *dev,
41 struct device_attribute *attr, char *buf)
42 {
43 struct zcrypt_card *zc = dev_get_drvdata(dev);
44
45 return sysfs_emit(buf, "%s\n", zc->type_string);
46 }
47
48 static DEVICE_ATTR_RO(type);
49
online_show(struct device * dev,struct device_attribute * attr,char * buf)50 static ssize_t online_show(struct device *dev,
51 struct device_attribute *attr,
52 char *buf)
53 {
54 struct zcrypt_card *zc = dev_get_drvdata(dev);
55 struct ap_card *ac = to_ap_card(dev);
56 int online = ac->config && !ac->chkstop && zc->online ? 1 : 0;
57
58 return sysfs_emit(buf, "%d\n", online);
59 }
60
online_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)61 static ssize_t online_store(struct device *dev,
62 struct device_attribute *attr,
63 const char *buf, size_t count)
64 {
65 struct zcrypt_card *zc = dev_get_drvdata(dev);
66 struct ap_card *ac = to_ap_card(dev);
67 struct zcrypt_queue *zq;
68 int online, id, i = 0, maxzqs = 0;
69 struct zcrypt_queue **zq_uelist = NULL;
70
71 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
72 return -EINVAL;
73
74 if (online && (!ac->config || ac->chkstop))
75 return -ENODEV;
76
77 zc->online = online;
78 id = zc->card->id;
79
80 ZCRYPT_DBF_INFO("%s card=%02x online=%d\n", __func__, id, online);
81
82 ap_send_online_uevent(&ac->ap_dev, online);
83
84 spin_lock(&zcrypt_list_lock);
85 /*
86 * As we are in atomic context here, directly sending uevents
87 * does not work. So collect the zqueues in a dynamic array
88 * and process them after zcrypt_list_lock release. As we get/put
89 * the zqueue objects, we make sure they exist after lock release.
90 */
91 list_for_each_entry(zq, &zc->zqueues, list)
92 maxzqs++;
93 if (maxzqs > 0)
94 zq_uelist = kcalloc(maxzqs + 1, sizeof(*zq_uelist), GFP_ATOMIC);
95 list_for_each_entry(zq, &zc->zqueues, list)
96 if (zcrypt_queue_force_online(zq, online))
97 if (zq_uelist) {
98 zcrypt_queue_get(zq);
99 zq_uelist[i++] = zq;
100 }
101 spin_unlock(&zcrypt_list_lock);
102 if (zq_uelist) {
103 for (i = 0; zq_uelist[i]; i++) {
104 zq = zq_uelist[i];
105 ap_send_online_uevent(&zq->queue->ap_dev, online);
106 zcrypt_queue_put(zq);
107 }
108 kfree(zq_uelist);
109 }
110
111 return count;
112 }
113
114 static DEVICE_ATTR_RW(online);
115
load_show(struct device * dev,struct device_attribute * attr,char * buf)116 static ssize_t load_show(struct device *dev,
117 struct device_attribute *attr,
118 char *buf)
119 {
120 struct zcrypt_card *zc = dev_get_drvdata(dev);
121
122 return sysfs_emit(buf, "%d\n", atomic_read(&zc->load));
123 }
124
125 static DEVICE_ATTR_RO(load);
126
127 static struct attribute *zcrypt_card_attrs[] = {
128 &dev_attr_type.attr,
129 &dev_attr_online.attr,
130 &dev_attr_load.attr,
131 NULL,
132 };
133
134 static const struct attribute_group zcrypt_card_attr_group = {
135 .attrs = zcrypt_card_attrs,
136 };
137
zcrypt_card_alloc(void)138 struct zcrypt_card *zcrypt_card_alloc(void)
139 {
140 struct zcrypt_card *zc;
141
142 zc = kzalloc(sizeof(*zc), GFP_KERNEL);
143 if (!zc)
144 return NULL;
145 INIT_LIST_HEAD(&zc->list);
146 INIT_LIST_HEAD(&zc->zqueues);
147 kref_init(&zc->refcount);
148 return zc;
149 }
150 EXPORT_SYMBOL(zcrypt_card_alloc);
151
zcrypt_card_free(struct zcrypt_card * zc)152 void zcrypt_card_free(struct zcrypt_card *zc)
153 {
154 kfree(zc);
155 }
156 EXPORT_SYMBOL(zcrypt_card_free);
157
zcrypt_card_release(struct kref * kref)158 static void zcrypt_card_release(struct kref *kref)
159 {
160 struct zcrypt_card *zdev =
161 container_of(kref, struct zcrypt_card, refcount);
162 zcrypt_card_free(zdev);
163 }
164
zcrypt_card_get(struct zcrypt_card * zc)165 void zcrypt_card_get(struct zcrypt_card *zc)
166 {
167 kref_get(&zc->refcount);
168 }
169 EXPORT_SYMBOL(zcrypt_card_get);
170
zcrypt_card_put(struct zcrypt_card * zc)171 int zcrypt_card_put(struct zcrypt_card *zc)
172 {
173 return kref_put(&zc->refcount, zcrypt_card_release);
174 }
175 EXPORT_SYMBOL(zcrypt_card_put);
176
177 /**
178 * zcrypt_card_register() - Register a crypto card device.
179 * @zc: Pointer to a crypto card device
180 *
181 * Register a crypto card device. Returns 0 if successful.
182 */
zcrypt_card_register(struct zcrypt_card * zc)183 int zcrypt_card_register(struct zcrypt_card *zc)
184 {
185 int rc;
186
187 spin_lock(&zcrypt_list_lock);
188 list_add_tail(&zc->list, &zcrypt_card_list);
189 spin_unlock(&zcrypt_list_lock);
190
191 zc->online = 1;
192
193 ZCRYPT_DBF_INFO("%s card=%02x register online=1\n",
194 __func__, zc->card->id);
195
196 rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
197 &zcrypt_card_attr_group);
198 if (rc) {
199 spin_lock(&zcrypt_list_lock);
200 list_del_init(&zc->list);
201 spin_unlock(&zcrypt_list_lock);
202 }
203
204 return rc;
205 }
206 EXPORT_SYMBOL(zcrypt_card_register);
207
208 /**
209 * zcrypt_card_unregister(): Unregister a crypto card device.
210 * @zc: Pointer to crypto card device
211 *
212 * Unregister a crypto card device.
213 */
zcrypt_card_unregister(struct zcrypt_card * zc)214 void zcrypt_card_unregister(struct zcrypt_card *zc)
215 {
216 ZCRYPT_DBF_INFO("%s card=%02x unregister\n",
217 __func__, zc->card->id);
218
219 spin_lock(&zcrypt_list_lock);
220 list_del_init(&zc->list);
221 spin_unlock(&zcrypt_list_lock);
222 sysfs_remove_group(&zc->card->ap_dev.device.kobj,
223 &zcrypt_card_attr_group);
224 zcrypt_card_put(zc);
225 }
226 EXPORT_SYMBOL(zcrypt_card_unregister);
227