1 // SPDX-License-Identifier: GPL-2.0+
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>
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>
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/interrupt.h>
17 #include <linux/miscdevice.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>
29 #include "zcrypt_debug.h"
30 #include "zcrypt_api.h"
32 #include "zcrypt_msgtype6.h"
33 #include "zcrypt_msgtype50.h"
36 * Device attributes common for all crypto queue devices.
39 static ssize_t
online_show(struct device
*dev
,
40 struct device_attribute
*attr
,
43 struct zcrypt_queue
*zq
= to_ap_queue(dev
)->private;
45 return snprintf(buf
, PAGE_SIZE
, "%d\n", zq
->online
);
48 static ssize_t
online_store(struct device
*dev
,
49 struct device_attribute
*attr
,
50 const char *buf
, size_t count
)
52 struct zcrypt_queue
*zq
= to_ap_queue(dev
)->private;
53 struct zcrypt_card
*zc
= zq
->zcard
;
56 if (sscanf(buf
, "%d\n", &online
) != 1 || online
< 0 || online
> 1)
59 if (online
&& !zc
->online
)
63 ZCRYPT_DBF(DBF_INFO
, "queue=%02x.%04x online=%d\n",
64 AP_QID_CARD(zq
->queue
->qid
),
65 AP_QID_QUEUE(zq
->queue
->qid
),
69 ap_flush_queue(zq
->queue
);
73 static DEVICE_ATTR_RW(online
);
75 static ssize_t
load_show(struct device
*dev
,
76 struct device_attribute
*attr
,
79 struct zcrypt_queue
*zq
= to_ap_queue(dev
)->private;
81 return snprintf(buf
, PAGE_SIZE
, "%d\n", atomic_read(&zq
->load
));
84 static DEVICE_ATTR_RO(load
);
86 static struct attribute
*zcrypt_queue_attrs
[] = {
87 &dev_attr_online
.attr
,
92 static const struct attribute_group zcrypt_queue_attr_group
= {
93 .attrs
= zcrypt_queue_attrs
,
96 void zcrypt_queue_force_online(struct zcrypt_queue
*zq
, int online
)
100 ap_flush_queue(zq
->queue
);
103 struct zcrypt_queue
*zcrypt_queue_alloc(size_t max_response_size
)
105 struct zcrypt_queue
*zq
;
107 zq
= kzalloc(sizeof(struct zcrypt_queue
), GFP_KERNEL
);
110 zq
->reply
.message
= kmalloc(max_response_size
, GFP_KERNEL
);
111 if (!zq
->reply
.message
)
113 zq
->reply
.length
= max_response_size
;
114 INIT_LIST_HEAD(&zq
->list
);
115 kref_init(&zq
->refcount
);
122 EXPORT_SYMBOL(zcrypt_queue_alloc
);
124 void zcrypt_queue_free(struct zcrypt_queue
*zq
)
126 kfree(zq
->reply
.message
);
129 EXPORT_SYMBOL(zcrypt_queue_free
);
131 static void zcrypt_queue_release(struct kref
*kref
)
133 struct zcrypt_queue
*zq
=
134 container_of(kref
, struct zcrypt_queue
, refcount
);
135 zcrypt_queue_free(zq
);
138 void zcrypt_queue_get(struct zcrypt_queue
*zq
)
140 kref_get(&zq
->refcount
);
142 EXPORT_SYMBOL(zcrypt_queue_get
);
144 int zcrypt_queue_put(struct zcrypt_queue
*zq
)
146 return kref_put(&zq
->refcount
, zcrypt_queue_release
);
148 EXPORT_SYMBOL(zcrypt_queue_put
);
151 * zcrypt_queue_register() - Register a crypto queue device.
152 * @zq: Pointer to a crypto queue device
154 * Register a crypto queue device. Returns 0 if successful.
156 int zcrypt_queue_register(struct zcrypt_queue
*zq
)
158 struct zcrypt_card
*zc
;
161 spin_lock(&zcrypt_list_lock
);
162 zc
= zq
->queue
->card
->private;
165 zq
->online
= 1; /* New devices are online by default. */
167 ZCRYPT_DBF(DBF_INFO
, "queue=%02x.%04x register online=1\n",
168 AP_QID_CARD(zq
->queue
->qid
), AP_QID_QUEUE(zq
->queue
->qid
));
170 list_add_tail(&zq
->list
, &zc
->zqueues
);
171 zcrypt_device_count
++;
172 spin_unlock(&zcrypt_list_lock
);
174 rc
= sysfs_create_group(&zq
->queue
->ap_dev
.device
.kobj
,
175 &zcrypt_queue_attr_group
);
178 get_device(&zq
->queue
->ap_dev
.device
);
181 rc
= zcrypt_rng_device_add();
188 sysfs_remove_group(&zq
->queue
->ap_dev
.device
.kobj
,
189 &zcrypt_queue_attr_group
);
190 put_device(&zq
->queue
->ap_dev
.device
);
192 spin_lock(&zcrypt_list_lock
);
193 list_del_init(&zq
->list
);
194 spin_unlock(&zcrypt_list_lock
);
198 EXPORT_SYMBOL(zcrypt_queue_register
);
201 * zcrypt_queue_unregister(): Unregister a crypto queue device.
202 * @zq: Pointer to crypto queue device
204 * Unregister a crypto queue device.
206 void zcrypt_queue_unregister(struct zcrypt_queue
*zq
)
208 struct zcrypt_card
*zc
;
210 ZCRYPT_DBF(DBF_INFO
, "queue=%02x.%04x unregister\n",
211 AP_QID_CARD(zq
->queue
->qid
), AP_QID_QUEUE(zq
->queue
->qid
));
214 spin_lock(&zcrypt_list_lock
);
215 list_del_init(&zq
->list
);
216 zcrypt_device_count
--;
217 spin_unlock(&zcrypt_list_lock
);
220 zcrypt_rng_device_remove();
221 sysfs_remove_group(&zq
->queue
->ap_dev
.device
.kobj
,
222 &zcrypt_queue_attr_group
);
223 put_device(&zq
->queue
->ap_dev
.device
);
224 zcrypt_queue_put(zq
);
226 EXPORT_SYMBOL(zcrypt_queue_unregister
);