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 | |
39 | static 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 | |
47 | static DEVICE_ATTR_RO(type); |
48 | |
49 | static 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 | |
60 | static 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 | |
113 | static DEVICE_ATTR_RW(online); |
114 | |
115 | static 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 | |
124 | static DEVICE_ATTR_RO(load); |
125 | |
126 | static struct attribute *zcrypt_card_attrs[] = { |
127 | &dev_attr_type.attr, |
128 | &dev_attr_online.attr, |
129 | &dev_attr_load.attr, |
130 | NULL, |
131 | }; |
132 | |
133 | static const struct attribute_group zcrypt_card_attr_group = { |
134 | .attrs = zcrypt_card_attrs, |
135 | }; |
136 | |
137 | struct 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 | } |
149 | EXPORT_SYMBOL(zcrypt_card_alloc); |
150 | |
151 | void zcrypt_card_free(struct zcrypt_card *zc) |
152 | { |
153 | kfree(objp: zc); |
154 | } |
155 | EXPORT_SYMBOL(zcrypt_card_free); |
156 | |
157 | static 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 | |
164 | void zcrypt_card_get(struct zcrypt_card *zc) |
165 | { |
166 | kref_get(kref: &zc->refcount); |
167 | } |
168 | EXPORT_SYMBOL(zcrypt_card_get); |
169 | |
170 | int zcrypt_card_put(struct zcrypt_card *zc) |
171 | { |
172 | return kref_put(kref: &zc->refcount, release: zcrypt_card_release); |
173 | } |
174 | EXPORT_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 | */ |
182 | int 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 | } |
205 | EXPORT_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 | */ |
213 | void 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 | } |
225 | EXPORT_SYMBOL(zcrypt_card_unregister); |
226 | |