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