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, fmt: "%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 && !ac->chkstop && zc->online ? 1 : 0;
56
57 return sysfs_emit(buf, fmt: "%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 || ac->chkstop))
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(ap_dev: &ac->ap_dev, online);
82
83 spin_lock(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(n: maxzqs + 1, size: 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(lock: &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(ap_dev: &zq->queue->ap_dev, online);
105 zcrypt_queue_put(zq);
106 }
107 kfree(objp: 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, fmt: "%d\n", atomic_read(v: &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(size: sizeof(*zc), GFP_KERNEL);
142 if (!zc)
143 return NULL;
144 INIT_LIST_HEAD(list: &zc->list);
145 INIT_LIST_HEAD(list: &zc->zqueues);
146 kref_init(kref: &zc->refcount);
147 return zc;
148}
149EXPORT_SYMBOL(zcrypt_card_alloc);
150
151void zcrypt_card_free(struct zcrypt_card *zc)
152{
153 kfree(objp: 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(kref: &zc->refcount);
167}
168EXPORT_SYMBOL(zcrypt_card_get);
169
170int zcrypt_card_put(struct zcrypt_card *zc)
171{
172 return kref_put(kref: &zc->refcount, release: 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(lock: &zcrypt_list_lock);
187 list_add_tail(new: &zc->list, head: &zcrypt_card_list);
188 spin_unlock(lock: &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(kobj: &zc->card->ap_dev.device.kobj,
196 grp: &zcrypt_card_attr_group);
197 if (rc) {
198 spin_lock(lock: &zcrypt_list_lock);
199 list_del_init(entry: &zc->list);
200 spin_unlock(lock: &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(lock: &zcrypt_list_lock);
219 list_del_init(entry: &zc->list);
220 spin_unlock(lock: &zcrypt_list_lock);
221 sysfs_remove_group(kobj: &zc->card->ap_dev.device.kobj,
222 grp: &zcrypt_card_attr_group);
223 zcrypt_card_put(zc);
224}
225EXPORT_SYMBOL(zcrypt_card_unregister);
226

source code of linux/drivers/s390/crypto/zcrypt_card.c