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 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
50static 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
79static DEVICE_ATTR_RW(online);
80
81static 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
90static DEVICE_ATTR_RO(load);
91
92static struct attribute *zcrypt_queue_attrs[] = {
93	&dev_attr_online.attr,
94	&dev_attr_load.attr,
95	NULL,
96};
97
98static const struct attribute_group zcrypt_queue_attr_group = {
99	.attrs = zcrypt_queue_attrs,
100};
101
102bool 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
113struct 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
128out_free:
129	kfree(zq);
130	return NULL;
131}
132EXPORT_SYMBOL(zcrypt_queue_alloc);
133
134void zcrypt_queue_free(struct zcrypt_queue *zq)
135{
136	kfree(zq->reply.msg);
137	kfree(zq);
138}
139EXPORT_SYMBOL(zcrypt_queue_free);
140
141static 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
148void zcrypt_queue_get(struct zcrypt_queue *zq)
149{
150	kref_get(&zq->refcount);
151}
152EXPORT_SYMBOL(zcrypt_queue_get);
153
154int zcrypt_queue_put(struct zcrypt_queue *zq)
155{
156	return kref_put(&zq->refcount, zcrypt_queue_release);
157}
158EXPORT_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 */
166int 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
196out_unregister:
197	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
198			   &zcrypt_queue_attr_group);
199out:
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}
206EXPORT_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 */
214void 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}
233EXPORT_SYMBOL(zcrypt_queue_unregister);
234