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 queue devices.
 37 */
 38
 39static ssize_t online_show(struct device *dev,
 40			   struct device_attribute *attr,
 41			   char *buf)
 42{
 43	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
 44
 45	return snprintf(buf, PAGE_SIZE, "%d\n", zq->online);
 46}
 47
 48static ssize_t online_store(struct device *dev,
 49			    struct device_attribute *attr,
 50			    const char *buf, size_t count)
 51{
 52	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
 53	struct zcrypt_card *zc = zq->zcard;
 54	int online;
 55
 56	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
 57		return -EINVAL;
 58
 59	if (online && !zc->online)
 60		return -EINVAL;
 61	zq->online = online;
 62
 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),
 66		   online);
 67
 68	if (!online)
 69		ap_flush_queue(zq->queue);
 70	return count;
 71}
 72
 73static DEVICE_ATTR_RW(online);
 74
 75static ssize_t load_show(struct device *dev,
 76			 struct device_attribute *attr,
 77			 char *buf)
 78{
 79	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
 80
 81	return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&zq->load));
 82}
 83
 84static DEVICE_ATTR_RO(load);
 85
 86static struct attribute *zcrypt_queue_attrs[] = {
 87	&dev_attr_online.attr,
 88	&dev_attr_load.attr,
 89	NULL,
 90};
 91
 92static const struct attribute_group zcrypt_queue_attr_group = {
 93	.attrs = zcrypt_queue_attrs,
 94};
 95
 96void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
 97{
 98	zq->online = online;
 99	if (!online)
100		ap_flush_queue(zq->queue);
101}
102
103struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size)
104{
105	struct zcrypt_queue *zq;
106
107	zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
108	if (!zq)
109		return NULL;
110	zq->reply.message = kmalloc(max_response_size, GFP_KERNEL);
111	if (!zq->reply.message)
112		goto out_free;
113	zq->reply.length = max_response_size;
114	INIT_LIST_HEAD(&zq->list);
115	kref_init(&zq->refcount);
116	return zq;
117
118out_free:
119	kfree(zq);
120	return NULL;
121}
122EXPORT_SYMBOL(zcrypt_queue_alloc);
123
124void zcrypt_queue_free(struct zcrypt_queue *zq)
125{
126	kfree(zq->reply.message);
127	kfree(zq);
128}
129EXPORT_SYMBOL(zcrypt_queue_free);
130
131static void zcrypt_queue_release(struct kref *kref)
132{
133	struct zcrypt_queue *zq =
134		container_of(kref, struct zcrypt_queue, refcount);
135	zcrypt_queue_free(zq);
136}
137
138void zcrypt_queue_get(struct zcrypt_queue *zq)
139{
140	kref_get(&zq->refcount);
141}
142EXPORT_SYMBOL(zcrypt_queue_get);
143
144int zcrypt_queue_put(struct zcrypt_queue *zq)
145{
146	return kref_put(&zq->refcount, zcrypt_queue_release);
147}
148EXPORT_SYMBOL(zcrypt_queue_put);
149
150/**
151 * zcrypt_queue_register() - Register a crypto queue device.
152 * @zq: Pointer to a crypto queue device
153 *
154 * Register a crypto queue device. Returns 0 if successful.
155 */
156int zcrypt_queue_register(struct zcrypt_queue *zq)
157{
158	struct zcrypt_card *zc;
159	int rc;
160
161	spin_lock(&zcrypt_list_lock);
162	zc = zq->queue->card->private;
163	zcrypt_card_get(zc);
164	zq->zcard = zc;
165	zq->online = 1;	/* New devices are online by default. */
166
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));
169
170	list_add_tail(&zq->list, &zc->zqueues);
171	zcrypt_device_count++;
172	spin_unlock(&zcrypt_list_lock);
173
174	rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
175				&zcrypt_queue_attr_group);
176	if (rc)
177		goto out;
178	get_device(&zq->queue->ap_dev.device);
179
180	if (zq->ops->rng) {
181		rc = zcrypt_rng_device_add();
182		if (rc)
183			goto out_unregister;
184	}
185	return 0;
186
187out_unregister:
188	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
189			   &zcrypt_queue_attr_group);
190	put_device(&zq->queue->ap_dev.device);
191out:
192	spin_lock(&zcrypt_list_lock);
193	list_del_init(&zq->list);
194	spin_unlock(&zcrypt_list_lock);
195	zcrypt_card_put(zc);
196	return rc;
197}
198EXPORT_SYMBOL(zcrypt_queue_register);
199
200/**
201 * zcrypt_queue_unregister(): Unregister a crypto queue device.
202 * @zq: Pointer to crypto queue device
203 *
204 * Unregister a crypto queue device.
205 */
206void zcrypt_queue_unregister(struct zcrypt_queue *zq)
207{
208	struct zcrypt_card *zc;
209
210	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n",
211		   AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
212
213	zc = zq->zcard;
214	spin_lock(&zcrypt_list_lock);
215	list_del_init(&zq->list);
216	zcrypt_device_count--;
217	spin_unlock(&zcrypt_list_lock);
218	zcrypt_card_put(zc);
219	if (zq->ops->rng)
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);
225}
226EXPORT_SYMBOL(zcrypt_queue_unregister);