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 ap_queue *aq = to_ap_queue(dev);
44 struct zcrypt_queue *zq = aq->private;
45 int online = aq->config && zq->online ? 1 : 0;
47 return scnprintf(buf, PAGE_SIZE, "%d\n", online);
50 static ssize_t online_store(struct device *dev,
51 struct device_attribute *attr,
52 const char *buf, size_t count)
54 struct ap_queue *aq = to_ap_queue(dev);
55 struct zcrypt_queue *zq = aq->private;
56 struct zcrypt_card *zc = zq->zcard;
59 if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
62 if (online && (!aq->config || !aq->card->config))
64 if (online && !zc->online)
68 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n",
69 AP_QID_CARD(zq->queue->qid),
70 AP_QID_QUEUE(zq->queue->qid),
73 ap_send_online_uevent(&aq->ap_dev, online);
76 ap_flush_queue(zq->queue);
80 static DEVICE_ATTR_RW(online);
82 static ssize_t load_show(struct device *dev,
83 struct device_attribute *attr,
86 struct zcrypt_queue *zq = to_ap_queue(dev)->private;
88 return scnprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load));
91 static DEVICE_ATTR_RO(load);
93 static struct attribute *zcrypt_queue_attrs[] = {
94 &dev_attr_online.attr,
99 static const struct attribute_group zcrypt_queue_attr_group = {
100 .attrs = zcrypt_queue_attrs,
103 bool zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
105 if (!!zq->online != !!online) {
108 ap_flush_queue(zq->queue);
114 struct zcrypt_queue *zcrypt_queue_alloc(size_t reply_buf_size)
116 struct zcrypt_queue *zq;
118 zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
121 zq->reply.msg = kmalloc(reply_buf_size, GFP_KERNEL);
124 zq->reply.bufsize = reply_buf_size;
125 INIT_LIST_HEAD(&zq->list);
126 kref_init(&zq->refcount);
133 EXPORT_SYMBOL(zcrypt_queue_alloc);
135 void zcrypt_queue_free(struct zcrypt_queue *zq)
137 kfree(zq->reply.msg);
140 EXPORT_SYMBOL(zcrypt_queue_free);
142 static void zcrypt_queue_release(struct kref *kref)
144 struct zcrypt_queue *zq =
145 container_of(kref, struct zcrypt_queue, refcount);
146 zcrypt_queue_free(zq);
149 void zcrypt_queue_get(struct zcrypt_queue *zq)
151 kref_get(&zq->refcount);
153 EXPORT_SYMBOL(zcrypt_queue_get);
155 int zcrypt_queue_put(struct zcrypt_queue *zq)
157 return kref_put(&zq->refcount, zcrypt_queue_release);
159 EXPORT_SYMBOL(zcrypt_queue_put);
162 * zcrypt_queue_register() - Register a crypto queue device.
163 * @zq: Pointer to a crypto queue device
165 * Register a crypto queue device. Returns 0 if successful.
167 int zcrypt_queue_register(struct zcrypt_queue *zq)
169 struct zcrypt_card *zc;
172 spin_lock(&zcrypt_list_lock);
173 zc = zq->queue->card->private;
176 zq->online = 1; /* New devices are online by default. */
178 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n",
179 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
181 list_add_tail(&zq->list, &zc->zqueues);
182 spin_unlock(&zcrypt_list_lock);
184 rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
185 &zcrypt_queue_attr_group);
190 rc = zcrypt_rng_device_add();
197 sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
198 &zcrypt_queue_attr_group);
200 spin_lock(&zcrypt_list_lock);
201 list_del_init(&zq->list);
202 spin_unlock(&zcrypt_list_lock);
206 EXPORT_SYMBOL(zcrypt_queue_register);
209 * zcrypt_queue_unregister(): Unregister a crypto queue device.
210 * @zq: Pointer to crypto queue device
212 * Unregister a crypto queue device.
214 void zcrypt_queue_unregister(struct zcrypt_queue *zq)
216 struct zcrypt_card *zc;
218 ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n",
219 AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
222 spin_lock(&zcrypt_list_lock);
223 list_del_init(&zq->list);
224 spin_unlock(&zcrypt_list_lock);
226 zcrypt_rng_device_remove();
227 sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
228 &zcrypt_queue_attr_group);
230 zcrypt_queue_put(zq);
232 EXPORT_SYMBOL(zcrypt_queue_unregister);