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 queue devices.
37  */
38 
39 static ssize_t online_show(struct device *dev,
40 			   struct device_attribute *attr,
41 			   char *buf)
42 {
43 	struct zcrypt_queue *zq = dev_get_drvdata(dev);
44 	struct ap_queue *aq = to_ap_queue(dev);
45 	int online = aq->config && zq->online ? 1 : 0;
46 
47 	return sysfs_emit(buf, "%d\n", online);
48 }
49 
50 static ssize_t online_store(struct device *dev,
51 			    struct device_attribute *attr,
52 			    const char *buf, size_t count)
53 {
54 	struct zcrypt_queue *zq = dev_get_drvdata(dev);
55 	struct ap_queue *aq = to_ap_queue(dev);
56 	struct zcrypt_card *zc = zq->zcard;
57 	int online;
58 
59 	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
60 		return -EINVAL;
61 
62 	if (online && (!aq->config || !aq->card->config))
63 		return -ENODEV;
64 	if (online && !zc->online)
65 		return -EINVAL;
66 	zq->online = online;
67 
68 	ZCRYPT_DBF_INFO("%s queue=%02x.%04x online=%d\n",
69 			__func__, AP_QID_CARD(zq->queue->qid),
70 			AP_QID_QUEUE(zq->queue->qid), online);
71 
72 	ap_send_online_uevent(&aq->ap_dev, online);
73 
74 	if (!online)
75 		ap_flush_queue(zq->queue);
76 	return count;
77 }
78 
79 static DEVICE_ATTR_RW(online);
80 
81 static ssize_t load_show(struct device *dev,
82 			 struct device_attribute *attr,
83 			 char *buf)
84 {
85 	struct zcrypt_queue *zq = dev_get_drvdata(dev);
86 
87 	return sysfs_emit(buf, "%d\n", atomic_read(&zq->load));
88 }
89 
90 static DEVICE_ATTR_RO(load);
91 
92 static struct attribute *zcrypt_queue_attrs[] = {
93 	&dev_attr_online.attr,
94 	&dev_attr_load.attr,
95 	NULL,
96 };
97 
98 static const struct attribute_group zcrypt_queue_attr_group = {
99 	.attrs = zcrypt_queue_attrs,
100 };
101 
102 bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
103 {
104 	if (!!zq->online != !!online) {
105 		zq->online = online;
106 		if (!online)
107 			ap_flush_queue(zq->queue);
108 		return true;
109 	}
110 	return false;
111 }
112 
113 struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size)
114 {
115 	struct zcrypt_queue *zq;
116 
117 	zq = kzalloc(sizeof(*zq), GFP_KERNEL);
118 	if (!zq)
119 		return NULL;
120 	zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL);
121 	if (!zq->reply.msg)
122 		goto out_free;
123 	zq->reply.bufsize = reply_buf_size;
124 	INIT_LIST_HEAD(&zq->list);
125 	kref_init(&zq->refcount);
126 	return zq;
127 
128 out_free:
129 	kfree(zq);
130 	return NULL;
131 }
132 EXPORT_SYMBOL(zcrypt_queue_alloc);
133 
134 void zcrypt_queue_free(struct zcrypt_queue *zq)
135 {
136 	kfree(zq->reply.msg);
137 	kfree(zq);
138 }
139 EXPORT_SYMBOL(zcrypt_queue_free);
140 
141 static void zcrypt_queue_release(struct kref *kref)
142 {
143 	struct zcrypt_queue *zq =
144 		container_of(kref, struct zcrypt_queue, refcount);
145 	zcrypt_queue_free(zq);
146 }
147 
148 void zcrypt_queue_get(struct zcrypt_queue *zq)
149 {
150 	kref_get(&zq->refcount);
151 }
152 EXPORT_SYMBOL(zcrypt_queue_get);
153 
154 int zcrypt_queue_put(struct zcrypt_queue *zq)
155 {
156 	return kref_put(&zq->refcount, zcrypt_queue_release);
157 }
158 EXPORT_SYMBOL(zcrypt_queue_put);
159 
160 /**
161  * zcrypt_queue_register() - Register a crypto queue device.
162  * @zq: Pointer to a crypto queue device
163  *
164  * Register a crypto queue device. Returns 0 if successful.
165  */
166 int zcrypt_queue_register(struct zcrypt_queue *zq)
167 {
168 	struct zcrypt_card *zc;
169 	int rc;
170 
171 	spin_lock(&zcrypt_list_lock);
172 	zc = dev_get_drvdata(&zq->queue->card->ap_dev.device);
173 	zcrypt_card_get(zc);
174 	zq->zcard = zc;
175 	zq->online = 1;	/* New devices are online by default. */
176 
177 	ZCRYPT_DBF_INFO("%s queue=%02x.%04x register online=1\n",
178 			__func__, AP_QID_CARD(zq->queue->qid),
179 			AP_QID_QUEUE(zq->queue->qid));
180 
181 	list_add_tail(&zq->list, &zc->zqueues);
182 	spin_unlock(&zcrypt_list_lock);
183 
184 	rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
185 				&zcrypt_queue_attr_group);
186 	if (rc)
187 		goto out;
188 
189 	if (zq->ops->rng) {
190 		rc = zcrypt_rng_device_add();
191 		if (rc)
192 			goto out_unregister;
193 	}
194 	return 0;
195 
196 out_unregister:
197 	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
198 			   &zcrypt_queue_attr_group);
199 out:
200 	spin_lock(&zcrypt_list_lock);
201 	list_del_init(&zq->list);
202 	spin_unlock(&zcrypt_list_lock);
203 	zcrypt_card_put(zc);
204 	return rc;
205 }
206 EXPORT_SYMBOL(zcrypt_queue_register);
207 
208 /**
209  * zcrypt_queue_unregister(): Unregister a crypto queue device.
210  * @zq: Pointer to crypto queue device
211  *
212  * Unregister a crypto queue device.
213  */
214 void zcrypt_queue_unregister(struct zcrypt_queue *zq)
215 {
216 	struct zcrypt_card *zc;
217 
218 	ZCRYPT_DBF_INFO("%s queue=%02x.%04x unregister\n",
219 			__func__, AP_QID_CARD(zq->queue->qid),
220 			AP_QID_QUEUE(zq->queue->qid));
221 
222 	zc = zq->zcard;
223 	spin_lock(&zcrypt_list_lock);
224 	list_del_init(&zq->list);
225 	spin_unlock(&zcrypt_list_lock);
226 	if (zq->ops->rng)
227 		zcrypt_rng_device_remove();
228 	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
229 			   &zcrypt_queue_attr_group);
230 	zcrypt_card_put(zc);
231 	zcrypt_queue_put(zq);
232 }
233 EXPORT_SYMBOL(zcrypt_queue_unregister);
234