[mirror_ubuntu-bionic-kernel.git] / drivers / s390 / crypto / zcrypt_queue.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *  zcrypt 2.1.0
 *
 *  Copyright IBM Corp. 2001, 2012
 *  Author(s): Robert Burroughs
 *	       Eric Rossman (edrossma@us.ibm.com)
 *	       Cornelia Huck <cornelia.huck@de.ibm.com>
 *
 *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
 *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
 *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
 *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/miscdevice.h>
#include <linux/fs.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/compat.h>
#include <linux/slab.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>
#include <linux/hw_random.h>
#include <linux/debugfs.h>
#include <asm/debug.h>

#include "zcrypt_debug.h"
#include "zcrypt_api.h"

#include "zcrypt_msgtype6.h"
#include "zcrypt_msgtype50.h"

/*
 * Device attributes common for all crypto queue devices.
 */

static ssize_t zcrypt_queue_online_show(struct device *dev,
					struct device_attribute *attr,
					char *buf)
{
	struct zcrypt_queue *zq = to_ap_queue(dev)->private;

	return snprintf(buf, PAGE_SIZE, "%d\n", zq->online);
}

static ssize_t zcrypt_queue_online_store(struct device *dev,
					 struct device_attribute *attr,
					 const char *buf, size_t count)
{
	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
	struct zcrypt_card *zc = zq->zcard;
	int online;

	if (sscanf(buf, "%d\n", &online) != 1 || online < 0 || online > 1)
		return -EINVAL;

	if (online && !zc->online)
		return -EINVAL;
	zq->online = online;

	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n",
		   AP_QID_CARD(zq->queue->qid),
		   AP_QID_QUEUE(zq->queue->qid),
		   online);

	if (!online)
		ap_flush_queue(zq->queue);
	return count;
}

static DEVICE_ATTR(online, 0644, zcrypt_queue_online_show,
		   zcrypt_queue_online_store);

static struct attribute *zcrypt_queue_attrs[] = {
	&dev_attr_online.attr,
	NULL,
};

static const struct attribute_group zcrypt_queue_attr_group = {
	.attrs = zcrypt_queue_attrs,
};

void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
{
	zq->online = online;
	if (!online)
		ap_flush_queue(zq->queue);
}

struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size)
{
	struct zcrypt_queue *zq;

	zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
	if (!zq)
		return NULL;
	zq->reply.message = kmalloc(max_response_size, GFP_KERNEL);
	if (!zq->reply.message)
		goto out_free;
	zq->reply.length = max_response_size;
	INIT_LIST_HEAD(&zq->list);
	kref_init(&zq->refcount);
	return zq;

out_free:
	kfree(zq);
	return NULL;
}
EXPORT_SYMBOL(zcrypt_queue_alloc);

void zcrypt_queue_free(struct zcrypt_queue *zq)
{
	kfree(zq->reply.message);
	kfree(zq);
}
EXPORT_SYMBOL(zcrypt_queue_free);

static void zcrypt_queue_release(struct kref *kref)
{
	struct zcrypt_queue *zq =
		container_of(kref, struct zcrypt_queue, refcount);
	zcrypt_queue_free(zq);
}

void zcrypt_queue_get(struct zcrypt_queue *zq)
{
	kref_get(&zq->refcount);
}
EXPORT_SYMBOL(zcrypt_queue_get);

int zcrypt_queue_put(struct zcrypt_queue *zq)
{
	return kref_put(&zq->refcount, zcrypt_queue_release);
}
EXPORT_SYMBOL(zcrypt_queue_put);

/**
 * zcrypt_queue_register() - Register a crypto queue device.
 * @zq: Pointer to a crypto queue device
 *
 * Register a crypto queue device. Returns 0 if successful.
 */
int zcrypt_queue_register(struct zcrypt_queue *zq)
{
	struct zcrypt_card *zc;
	int rc;

	spin_lock(&zcrypt_list_lock);
	zc = zq->queue->card->private;
	zcrypt_card_get(zc);
	zq->zcard = zc;
	zq->online = 1;	/* New devices are online by default. */

	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n",
		   AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));

	list_add_tail(&zq->list, &zc->zqueues);
	zcrypt_device_count++;
	spin_unlock(&zcrypt_list_lock);

	rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
				&zcrypt_queue_attr_group);
	if (rc)
		goto out;
	get_device(&zq->queue->ap_dev.device);

	if (zq->ops->rng) {
		rc = zcrypt_rng_device_add();
		if (rc)
			goto out_unregister;
	}
	return 0;

out_unregister:
	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
			   &zcrypt_queue_attr_group);
	put_device(&zq->queue->ap_dev.device);
out:
	spin_lock(&zcrypt_list_lock);
	list_del_init(&zq->list);
	spin_unlock(&zcrypt_list_lock);
	zcrypt_card_put(zc);
	return rc;
}
EXPORT_SYMBOL(zcrypt_queue_register);

/**
 * zcrypt_queue_unregister(): Unregister a crypto queue device.
 * @zq: Pointer to crypto queue device
 *
 * Unregister a crypto queue device.
 */
void zcrypt_queue_unregister(struct zcrypt_queue *zq)
{
	struct zcrypt_card *zc;

	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n",
		   AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));

	zc = zq->zcard;
	spin_lock(&zcrypt_list_lock);
	list_del_init(&zq->list);
	zcrypt_device_count--;
	spin_unlock(&zcrypt_list_lock);
	zcrypt_card_put(zc);
	if (zq->ops->rng)
		zcrypt_rng_device_remove();
	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
			   &zcrypt_queue_attr_group);
	put_device(&zq->queue->ap_dev.device);
	zcrypt_queue_put(zq);
}
EXPORT_SYMBOL(zcrypt_queue_unregister);
Commit	Line	Data
812141a9	1	// SPDX-License-Identifier: GPL-2.0+
e28d2af4 IT	2	/*
	3	* zcrypt 2.1.0
	4	*
	5	* Copyright IBM Corp. 2001, 2012
	6	* Author(s): Robert Burroughs
	7	* Eric Rossman (edrossma@us.ibm.com)
	8	* Cornelia Huck <cornelia.huck@de.ibm.com>
	9	*
	10	* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
	11	* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
	12	* Ralph Wuerthner <rwuerthn@de.ibm.com>
	13	* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
e28d2af4 IT	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/init.h>
	18	#include <linux/interrupt.h>
	19	#include <linux/miscdevice.h>
	20	#include <linux/fs.h>
	21	#include <linux/proc_fs.h>
	22	#include <linux/seq_file.h>
	23	#include <linux/compat.h>
	24	#include <linux/slab.h>
	25	#include <linux/atomic.h>
	26	#include <linux/uaccess.h>
	27	#include <linux/hw_random.h>
	28	#include <linux/debugfs.h>
	29	#include <asm/debug.h>
	30
	31	#include "zcrypt_debug.h"
	32	#include "zcrypt_api.h"
	33
	34	#include "zcrypt_msgtype6.h"
	35	#include "zcrypt_msgtype50.h"
	36
	37	/*
	38	* Device attributes common for all crypto queue devices.
	39	*/
	40
	41	static ssize_t zcrypt_queue_online_show(struct device *dev,
	42	struct device_attribute *attr,
	43	char *buf)
	44	{
	45	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
	46
	47	return snprintf(buf, PAGE_SIZE, "%d\n", zq->online);
	48	}
	49
	50	static ssize_t zcrypt_queue_online_store(struct device *dev,
	51	struct device_attribute *attr,
	52	const char *buf, size_t count)
	53	{
	54	struct zcrypt_queue *zq = to_ap_queue(dev)->private;
	55	struct zcrypt_card *zc = zq->zcard;
	56	int online;
	57
	58	if (sscanf(buf, "%d\n", &online) != 1 \|\| online < 0 \|\| online > 1)
	59	return -EINVAL;
	60
	61	if (online && !zc->online)
	62	return -EINVAL;
	63	zq->online = online;
cccd85bf HF	64
	65	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x online=%d\n",
	66	AP_QID_CARD(zq->queue->qid),
	67	AP_QID_QUEUE(zq->queue->qid),
	68	online);
	69
e28d2af4 IT	70	if (!online)
	71	ap_flush_queue(zq->queue);
	72	return count;
	73	}
	74
	75	static DEVICE_ATTR(online, 0644, zcrypt_queue_online_show,
	76	zcrypt_queue_online_store);
	77
	78	static struct attribute *zcrypt_queue_attrs[] = {
	79	&dev_attr_online.attr,
	80	NULL,
	81	};
	82
9920decd	83	static const struct attribute_group zcrypt_queue_attr_group = {
e28d2af4 IT	84	.attrs = zcrypt_queue_attrs,
	85	};
	86
	87	void zcrypt_queue_force_online(struct zcrypt_queue *zq, int online)
	88	{
	89	zq->online = online;
	90	if (!online)
	91	ap_flush_queue(zq->queue);
	92	}
	93
	94	struct zcrypt_queue *zcrypt_queue_alloc(size_t max_response_size)
	95	{
	96	struct zcrypt_queue *zq;
	97
	98	zq = kzalloc(sizeof(struct zcrypt_queue), GFP_KERNEL);
	99	if (!zq)
	100	return NULL;
	101	zq->reply.message = kmalloc(max_response_size, GFP_KERNEL);
	102	if (!zq->reply.message)
	103	goto out_free;
	104	zq->reply.length = max_response_size;
	105	INIT_LIST_HEAD(&zq->list);
e28d2af4 IT	106	kref_init(&zq->refcount);
	107	return zq;
	108
	109	out_free:
	110	kfree(zq);
	111	return NULL;
	112	}
	113	EXPORT_SYMBOL(zcrypt_queue_alloc);
	114
	115	void zcrypt_queue_free(struct zcrypt_queue *zq)
	116	{
	117	kfree(zq->reply.message);
	118	kfree(zq);
	119	}
	120	EXPORT_SYMBOL(zcrypt_queue_free);
	121
	122	static void zcrypt_queue_release(struct kref *kref)
	123	{
	124	struct zcrypt_queue *zq =
	125	container_of(kref, struct zcrypt_queue, refcount);
	126	zcrypt_queue_free(zq);
	127	}
	128
	129	void zcrypt_queue_get(struct zcrypt_queue *zq)
	130	{
	131	kref_get(&zq->refcount);
	132	}
	133	EXPORT_SYMBOL(zcrypt_queue_get);
	134
	135	int zcrypt_queue_put(struct zcrypt_queue *zq)
	136	{
	137	return kref_put(&zq->refcount, zcrypt_queue_release);
	138	}
	139	EXPORT_SYMBOL(zcrypt_queue_put);
	140
	141	/**
	142	* zcrypt_queue_register() - Register a crypto queue device.
	143	* @zq: Pointer to a crypto queue device
	144	*
	145	* Register a crypto queue device. Returns 0 if successful.
	146	*/
	147	int zcrypt_queue_register(struct zcrypt_queue *zq)
	148	{
	149	struct zcrypt_card *zc;
	150	int rc;
	151
	152	spin_lock(&zcrypt_list_lock);
	153	zc = zq->queue->card->private;
	154	zcrypt_card_get(zc);
	155	zq->zcard = zc;
	156	zq->online = 1; /* New devices are online by default. */
cccd85bf HF	157
	158	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x register online=1\n",
	159	AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
	160
e28d2af4 IT	161	list_add_tail(&zq->list, &zc->zqueues);
	162	zcrypt_device_count++;
	163	spin_unlock(&zcrypt_list_lock);
	164
	165	rc = sysfs_create_group(&zq->queue->ap_dev.device.kobj,
	166	&zcrypt_queue_attr_group);
	167	if (rc)
	168	goto out;
	169	get_device(&zq->queue->ap_dev.device);
	170
	171	if (zq->ops->rng) {
	172	rc = zcrypt_rng_device_add();
	173	if (rc)
	174	goto out_unregister;
	175	}
	176	return 0;
	177
	178	out_unregister:
	179	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
	180	&zcrypt_queue_attr_group);
	181	put_device(&zq->queue->ap_dev.device);
	182	out:
	183	spin_lock(&zcrypt_list_lock);
	184	list_del_init(&zq->list);
	185	spin_unlock(&zcrypt_list_lock);
	186	zcrypt_card_put(zc);
	187	return rc;
	188	}
	189	EXPORT_SYMBOL(zcrypt_queue_register);
	190
	191	/**
	192	* zcrypt_queue_unregister(): Unregister a crypto queue device.
	193	* @zq: Pointer to crypto queue device
	194	*
	195	* Unregister a crypto queue device.
	196	*/
	197	void zcrypt_queue_unregister(struct zcrypt_queue *zq)
	198	{
	199	struct zcrypt_card *zc;
	200
cccd85bf HF	201	ZCRYPT_DBF(DBF_INFO, "queue=%02x.%04x unregister\n",
	202	AP_QID_CARD(zq->queue->qid), AP_QID_QUEUE(zq->queue->qid));
	203
e28d2af4 IT	204	zc = zq->zcard;
	205	spin_lock(&zcrypt_list_lock);
	206	list_del_init(&zq->list);
	207	zcrypt_device_count--;
	208	spin_unlock(&zcrypt_list_lock);
	209	zcrypt_card_put(zc);
	210	if (zq->ops->rng)
	211	zcrypt_rng_device_remove();
	212	sysfs_remove_group(&zq->queue->ap_dev.device.kobj,
	213	&zcrypt_queue_attr_group);
	214	put_device(&zq->queue->ap_dev.device);
	215	zcrypt_queue_put(zq);
	216	}
	217	EXPORT_SYMBOL(zcrypt_queue_unregister);