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 queue devices.
38 */
39
online_show(struct device * dev,struct device_attribute * attr,char * buf)40 static ssize_t online_show(struct device *dev,
41 struct device_attribute *attr,
42 char *buf)
43 {
44 struct zcrypt_queue *zq = dev_get_drvdata(dev);
45 struct ap_queue *aq = to_ap_queue(dev);
46 int online = aq->config && !aq->chkstop && zq->online ? 1 : 0;
47
48 return sysfs_emit(buf, "%d\n", online);
49 }
50
online_store(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)51 static ssize_t online_store(struct device *dev,
52 struct device_attribute *attr,
53 const char *buf, size_t count)
54 {
55 struct zcrypt_queue *zq = dev_get_drvdata(dev);
56 struct ap_queue *aq = to_ap_queue(dev);
57 struct zcrypt_card *zc = zq->zcard;
58 int online;
59
60 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
61 return -EINVAL;
62
63 if (online && (!aq->config || !aq->card->config ||
64 aq->chkstop || aq->card->chkstop))
65 return -ENODEV;
66 if (online && !zc->online)
67 return -EINVAL;
68 zq->online = online;
69
70 ZCRYPT_DBF_INFO("%s queue=%02x.%04x online=%d\n",
71 __func__, AP_QID_CARD(zq->queue->qid),
72 AP_QID_QUEUE(zq->queue->qid), online);
73
74 ap_send_online_uevent(&aq->ap_dev, online);
75
76 if (!online)
77 ap_flush_queue(zq->queue);
78 return count;
79 }
80
81 static DEVICE_ATTR_RW(online);
82
load_show(struct device * dev,struct device_attribute * attr,char * buf)83 static ssize_t load_show(struct device *dev,
84 struct device_attribute *attr,
85 char *buf)
86 {
87 struct zcrypt_queue *zq = dev_get_drvdata(dev);
88
89 return sysfs_emit(buf, "%d\n", atomic_read(&zq->load));
90 }
91
92 static DEVICE_ATTR_RO(load);
93
94 static struct attribute *zcrypt_queue_attrs[] = {
95 &dev_attr_online.attr,
96 &dev_attr_load.attr,
97 NULL,
98 };
99
100 static const struct attribute_group zcrypt_queue_attr_group = {
101 .attrs = zcrypt_queue_attrs,
102 };
103
zcrypt_queue_force_online(struct zcrypt_queue * zq,int online)104 bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
105 {
106 if (!!zq->online != !!online) {
107 zq->online = online;
108 if (!online)
109 ap_flush_queue(zq->queue);
110 return true;
111 }
112 return false;
113 }
114
zcrypt_queue_alloc(size_t reply_buf_size)115 struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size)
116 {
117 struct zcrypt_queue *zq;
118
119 zq = kzalloc(sizeof(*zq), GFP_KERNEL);
120 if (!zq)
121 return NULL;
122 zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL);
123 if (!zq->reply.msg)
124 goto out_free;
125 zq->reply.bufsize = reply_buf_size;
126 INIT_LIST_HEAD(&zq->list);
127 kref_init(&zq->refcount);
128 return zq;
129
130 out_free:
131 kfree(zq);
132 return NULL;
133 }
134 EXPORT_SYMBOL(zcrypt_queue_alloc);
135
zcrypt_queue_free(struct zcrypt_queue * zq)136 void zcrypt_queue_free(struct zcrypt_queue *zq)
137 {
138 kfree(zq->reply.msg);
139 kfree(zq);
140 }
141 EXPORT_SYMBOL(zcrypt_queue_free);
142
zcrypt_queue_release(struct kref * kref)143 static void zcrypt_queue_release(struct kref *kref)
144 {
145 struct zcrypt_queue *zq =
146 container_of(kref, struct zcrypt_queue, refcount);
147 zcrypt_queue_free(zq);
148 }
149
zcrypt_queue_get(struct zcrypt_queue * zq)150 void zcrypt_queue_get(struct zcrypt_queue *zq)
151 {
152 kref_get(&zq->refcount);
153 }
154 EXPORT_SYMBOL(zcrypt_queue_get);
155
zcrypt_queue_put(struct zcrypt_queue * zq)156 int zcrypt_queue_put(struct zcrypt_queue *zq)
157 {
158 return kref_put(&zq->refcount, zcrypt_queue_release);
159 }
160 EXPORT_SYMBOL(zcrypt_queue_put);
161
162 /**
163 * zcrypt_queue_register() - Register a crypto queue device.
164 * @zq: Pointer to a crypto queue device
165 *
166 * Register a crypto queue device. Returns 0 if successful.
167 */
zcrypt_queue_register(struct zcrypt_queue * zq)168 int zcrypt_queue_register(struct zcrypt_queue *zq)
169 {
170 struct zcrypt_card *zc;
171 int rc;
172
173 spin_lock(&zcrypt_list_lock);
174 zc = dev_get_drvdata(&zq->queue->card->ap_dev.device);
175 zcrypt_card_get(zc);
176 zq->zcard = zc;
177 zq->online = 1; /* New devices are online by default. */
178
179 ZCRYPT_DBF_INFO("%s queue=%02x.%04x register online=1\n",
180 __func__, AP_QID_CARD(zq->queue->qid),
181 AP_QID_QUEUE(zq->queue->qid));
182
183 list_add_tail(&zq->list, &zc->zqueues);
184 spin_unlock(&zcrypt_list_lock);
185
186 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
187 &zcrypt_queue_attr_group);
188 if (rc)
189 goto out;
190
191 if (zq->ops->rng) {
192 rc = zcrypt_rng_device_add();
193 if (rc)
194 goto out_unregister;
195 }
196 return 0;
197
198 out_unregister:
199 sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
200 &zcrypt_queue_attr_group);
201 out:
202 spin_lock(&zcrypt_list_lock);
203 list_del_init(&zq->list);
204 spin_unlock(&zcrypt_list_lock);
205 zcrypt_card_put(zc);
206 return rc;
207 }
208 EXPORT_SYMBOL(zcrypt_queue_register);
209
210 /**
211 * zcrypt_queue_unregister(): Unregister a crypto queue device.
212 * @zq: Pointer to crypto queue device
213 *
214 * Unregister a crypto queue device.
215 */
zcrypt_queue_unregister(struct zcrypt_queue * zq)216 void zcrypt_queue_unregister(struct zcrypt_queue *zq)
217 {
218 struct zcrypt_card *zc;
219
220 ZCRYPT_DBF_INFO("%s queue=%02x.%04x unregister\n",
221 __func__, AP_QID_CARD(zq->queue->qid),
222 AP_QID_QUEUE(zq->queue->qid));
223
224 zc = zq->zcard;
225 spin_lock(&zcrypt_list_lock);
226 list_del_init(&zq->list);
227 spin_unlock(&zcrypt_list_lock);
228 if (zq->ops->rng)
229 zcrypt_rng_device_remove();
230 sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
231 &zcrypt_queue_attr_group);
232 zcrypt_card_put(zc);
233 zcrypt_queue_put(zq);
234 }
235 EXPORT_SYMBOL(zcrypt_queue_unregister);
236