1 /*
2  *  zcrypt 2.1.0
3  *
4  *  Copyright IBM Corp. 2001, 2012
5  *  Author(s): Robert Burroughs
6  *	       Eric Rossman (edrossma@us.ibm.com)
7  *	       Cornelia Huck <cornelia.huck@de.ibm.com>
8  *
9  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
10  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
11  *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
12  *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
13  *
14  * This program is free software; you can redistribute it and/or modify
15  * it under the terms of the GNU General Public License as published by
16  * the Free Software Foundation; either version 2, or (at your option)
17  * any later version.
18  *
19  * This program is distributed in the hope that it will be useful,
20  * but WITHOUT ANY WARRANTY; without even the implied warranty of
21  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22  * GNU General Public License for more details.
23  */
24 
25 #include <linux/module.h>
26 #include <linux/init.h>
27 #include <linux/interrupt.h>
28 #include <linux/miscdevice.h>
29 #include <linux/fs.h>
30 #include <linux/proc_fs.h>
31 #include <linux/seq_file.h>
32 #include <linux/compat.h>
33 #include <linux/slab.h>
34 #include <linux/atomic.h>
35 #include <linux/uaccess.h>
36 #include <linux/hw_random.h>
37 #include <linux/debugfs.h>
38 #include <asm/debug.h>
39 
40 #include "zcrypt_debug.h"
41 #include "zcrypt_api.h"
42 
43 #include "zcrypt_msgtype6.h"
44 #include "zcrypt_msgtype50.h"
45 
46 /*
47  * Device attributes common for all crypto queue devices.
48  */
49 
50 static ssize_t zcrypt_queue_online_show(struct device *dev,
51 					struct device_attribute *attr,
52 					char *buf)
53 {
54 	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
55 
56 	return snprintf(buf, PAGE_SIZE, "%d\n", zq->online);
57 }
58 
59 static ssize_t zcrypt_queue_online_store(struct device *dev,
60 					 struct device_attribute *attr,
61 					 const char *buf, size_t count)
62 {
63 	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
64 	struct zcrypt_card *zc = zq->zcard;
65 	int online;
66 
67 	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
68 		return -EINVAL;
69 
70 	if (online && !zc->online)
71 		return -EINVAL;
72 	zq->online = online;
73 
74 	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n",
75 		   AP_QID_CARD(zq->queue->qid),
76 		   AP_QID_QUEUE(zq->queue->qid),
77 		   online);
78 
79 	if (!online)
80 		ap_flush_queue(zq->queue);
81 	return count;
82 }
83 
84 static DEVICE_ATTR(online, 0644, zcrypt_queue_online_show,
85 		   zcrypt_queue_online_store);
86 
87 static struct attribute *zcrypt_queue_attrs[] = {
88 	&dev_attr_online.attr,
89 	NULL,
90 };
91 
92 static struct attribute_group zcrypt_queue_attr_group = {
93 	.attrs = zcrypt_queue_attrs,
94 };
95 
96 void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
97 {
98 	zq->online = online;
99 	if (!online)
100 		ap_flush_queue(zq->queue);
101 }
102 
103 struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size)
104 {
105 	struct zcrypt_queue *zq;
106 
107 	zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
108 	if (!zq)
109 		return NULL;
110 	zq->reply.message = kmalloc(max_response_size, GFP_KERNEL);
111 	if (!zq->reply.message)
112 		goto out_free;
113 	zq->reply.length = max_response_size;
114 	INIT_LIST_HEAD(&zq->list);
115 	kref_init(&zq->refcount);
116 	return zq;
117 
118 out_free:
119 	kfree(zq);
120 	return NULL;
121 }
122 EXPORT_SYMBOL(zcrypt_queue_alloc);
123 
124 void zcrypt_queue_free(struct zcrypt_queue *zq)
125 {
126 	kfree(zq->reply.message);
127 	kfree(zq);
128 }
129 EXPORT_SYMBOL(zcrypt_queue_free);
130 
131 static void zcrypt_queue_release(struct kref *kref)
132 {
133 	struct zcrypt_queue *zq =
134 		container_of(kref, struct zcrypt_queue, refcount);
135 	zcrypt_queue_free(zq);
136 }
137 
138 void zcrypt_queue_get(struct zcrypt_queue *zq)
139 {
140 	kref_get(&zq->refcount);
141 }
142 EXPORT_SYMBOL(zcrypt_queue_get);
143 
144 int zcrypt_queue_put(struct zcrypt_queue *zq)
145 {
146 	return kref_put(&zq->refcount, zcrypt_queue_release);
147 }
148 EXPORT_SYMBOL(zcrypt_queue_put);
149 
150 /**
151  * zcrypt_queue_register() - Register a crypto queue device.
152  * @zq: Pointer to a crypto queue device
153  *
154  * Register a crypto queue device. Returns 0 if successful.
155  */
156 int zcrypt_queue_register(struct zcrypt_queue *zq)
157 {
158 	struct zcrypt_card *zc;
159 	int rc;
160 
161 	spin_lock(&zcrypt_list_lock);
162 	zc = zq->queue->card->private;
163 	zcrypt_card_get(zc);
164 	zq->zcard = zc;
165 	zq->online = 1;	/* New devices are online by default. */
166 
167 	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n",
168 		   AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
169 
170 	list_add_tail(&zq->list, &zc->zqueues);
171 	zcrypt_device_count++;
172 	spin_unlock(&zcrypt_list_lock);
173 
174 	rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
175 				&zcrypt_queue_attr_group);
176 	if (rc)
177 		goto out;
178 	get_device(&zq->queue->ap_dev.device);
179 
180 	if (zq->ops->rng) {
181 		rc = zcrypt_rng_device_add();
182 		if (rc)
183 			goto out_unregister;
184 	}
185 	return 0;
186 
187 out_unregister:
188 	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
189 			   &zcrypt_queue_attr_group);
190 	put_device(&zq->queue->ap_dev.device);
191 out:
192 	spin_lock(&zcrypt_list_lock);
193 	list_del_init(&zq->list);
194 	spin_unlock(&zcrypt_list_lock);
195 	zcrypt_card_put(zc);
196 	return rc;
197 }
198 EXPORT_SYMBOL(zcrypt_queue_register);
199 
200 /**
201  * zcrypt_queue_unregister(): Unregister a crypto queue device.
202  * @zq: Pointer to crypto queue device
203  *
204  * Unregister a crypto queue device.
205  */
206 void zcrypt_queue_unregister(struct zcrypt_queue *zq)
207 {
208 	struct zcrypt_card *zc;
209 
210 	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n",
211 		   AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
212 
213 	zc = zq->zcard;
214 	spin_lock(&zcrypt_list_lock);
215 	list_del_init(&zq->list);
216 	zcrypt_device_count--;
217 	spin_unlock(&zcrypt_list_lock);
218 	zcrypt_card_put(zc);
219 	if (zq->ops->rng)
220 		zcrypt_rng_device_remove();
221 	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
222 			   &zcrypt_queue_attr_group);
223 	put_device(&zq->queue->ap_dev.device);
224 	zcrypt_queue_put(zq);
225 }
226 EXPORT_SYMBOL(zcrypt_queue_unregister);
227