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 card devices.
37 */
38
39static ssize_t type_show(struct device *dev,
40			 struct device_attribute *attr, char *buf)
41{
42	struct zcrypt_card *zc = dev_get_drvdata(dev);
43
44	return sysfs_emit(buf, "%s\n", zc->type_string);
45}
46
47static DEVICE_ATTR_RO(type);
48
49static ssize_t online_show(struct device *dev,
50			   struct device_attribute *attr,
51			   char *buf)
52{
53	struct zcrypt_card *zc = dev_get_drvdata(dev);
54	struct ap_card *ac = to_ap_card(dev);
55	int online = ac->config && zc->online ? 1 : 0;
56
57	return sysfs_emit(buf, "%d\n", online);
58}
59
60static ssize_t online_store(struct device *dev,
61			    struct device_attribute *attr,
62			    const char *buf, size_t count)
63{
64	struct zcrypt_card *zc = dev_get_drvdata(dev);
65	struct ap_card *ac = to_ap_card(dev);
66	struct zcrypt_queue *zq;
67	int online, id, i = 0, maxzqs = 0;
68	struct zcrypt_queue **zq_uelist = NULL;
69
70	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
71		return -EINVAL;
72
73	if (online && !ac->config)
74		return -ENODEV;
75
76	zc->online = online;
77	id = zc->card->id;
78
79	ZCRYPT_DBF_INFO("%s card=%02x online=%d\n", __func__, id, online);
80
81	ap_send_online_uevent(&ac->ap_dev, online);
82
83	spin_lock(&zcrypt_list_lock);
84	/*
85	 * As we are in atomic context here, directly sending uevents
86	 * does not work. So collect the zqueues in a dynamic array
87	 * and process them after zcrypt_list_lock release. As we get/put
88	 * the zqueue objects, we make sure they exist after lock release.
89	 */
90	list_for_each_entry(zq, &zc->zqueues, list)
91		maxzqs++;
92	if (maxzqs > 0)
93		zq_uelist = kcalloc(maxzqs + 1, sizeof(*zq_uelist), GFP_ATOMIC);
94	list_for_each_entry(zq, &zc->zqueues, list)
95		if (zcrypt_queue_force_online(zq, online))
96			if (zq_uelist) {
97				zcrypt_queue_get(zq);
98				zq_uelist[i++] = zq;
99			}
100	spin_unlock(&zcrypt_list_lock);
101	if (zq_uelist) {
102		for (i = 0; zq_uelist[i]; i++) {
103			zq = zq_uelist[i];
104			ap_send_online_uevent(&zq->queue->ap_dev, online);
105			zcrypt_queue_put(zq);
106		}
107		kfree(zq_uelist);
108	}
109
110	return count;
111}
112
113static DEVICE_ATTR_RW(online);
114
115static ssize_t load_show(struct device *dev,
116			 struct device_attribute *attr,
117			 char *buf)
118{
119	struct zcrypt_card *zc = dev_get_drvdata(dev);
120
121	return sysfs_emit(buf, "%d\n", atomic_read(&zc->load));
122}
123
124static DEVICE_ATTR_RO(load);
125
126static struct attribute *zcrypt_card_attrs[] = {
127	&dev_attr_type.attr,
128	&dev_attr_online.attr,
129	&dev_attr_load.attr,
130	NULL,
131};
132
133static const struct attribute_group zcrypt_card_attr_group = {
134	.attrs = zcrypt_card_attrs,
135};
136
137struct zcrypt_card *zcrypt_card_alloc(void)
138{
139	struct zcrypt_card *zc;
140
141	zc = kzalloc(sizeof(*zc), GFP_KERNEL);
142	if (!zc)
143		return NULL;
144	INIT_LIST_HEAD(&zc->list);
145	INIT_LIST_HEAD(&zc->zqueues);
146	kref_init(&zc->refcount);
147	return zc;
148}
149EXPORT_SYMBOL(zcrypt_card_alloc);
150
151void zcrypt_card_free(struct zcrypt_card *zc)
152{
153	kfree(zc);
154}
155EXPORT_SYMBOL(zcrypt_card_free);
156
157static void zcrypt_card_release(struct kref *kref)
158{
159	struct zcrypt_card *zdev =
160		container_of(kref, struct zcrypt_card, refcount);
161	zcrypt_card_free(zdev);
162}
163
164void zcrypt_card_get(struct zcrypt_card *zc)
165{
166	kref_get(&zc->refcount);
167}
168EXPORT_SYMBOL(zcrypt_card_get);
169
170int zcrypt_card_put(struct zcrypt_card *zc)
171{
172	return kref_put(&zc->refcount, zcrypt_card_release);
173}
174EXPORT_SYMBOL(zcrypt_card_put);
175
176/**
177 * zcrypt_card_register() - Register a crypto card device.
178 * @zc: Pointer to a crypto card device
179 *
180 * Register a crypto card device. Returns 0 if successful.
181 */
182int zcrypt_card_register(struct zcrypt_card *zc)
183{
184	int rc;
185
186	spin_lock(&zcrypt_list_lock);
187	list_add_tail(&zc->list, &zcrypt_card_list);
188	spin_unlock(&zcrypt_list_lock);
189
190	zc->online = 1;
191
192	ZCRYPT_DBF_INFO("%s card=%02x register online=1\n",
193			__func__, zc->card->id);
194
195	rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
196				&zcrypt_card_attr_group);
197	if (rc) {
198		spin_lock(&zcrypt_list_lock);
199		list_del_init(&zc->list);
200		spin_unlock(&zcrypt_list_lock);
201	}
202
203	return rc;
204}
205EXPORT_SYMBOL(zcrypt_card_register);
206
207/**
208 * zcrypt_card_unregister(): Unregister a crypto card device.
209 * @zc: Pointer to crypto card device
210 *
211 * Unregister a crypto card device.
212 */
213void zcrypt_card_unregister(struct zcrypt_card *zc)
214{
215	ZCRYPT_DBF_INFO("%s card=%02x unregister\n",
216			__func__, zc->card->id);
217
218	spin_lock(&zcrypt_list_lock);
219	list_del_init(&zc->list);
220	spin_unlock(&zcrypt_list_lock);
221	sysfs_remove_group(&zc->card->ap_dev.device.kobj,
222			   &zcrypt_card_attr_group);
223	zcrypt_card_put(zc);
224}
225EXPORT_SYMBOL(zcrypt_card_unregister);
226