[mirror_ubuntu-focal-kernel.git] / drivers / s390 / crypto / zcrypt_card.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 card devices.
 */

static ssize_t zcrypt_card_type_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct zcrypt_card *zc = to_ap_card(dev)->private;

	return snprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
}

static DEVICE_ATTR(type, 0444, zcrypt_card_type_show, NULL);

static ssize_t zcrypt_card_online_show(struct device *dev,
				       struct device_attribute *attr,
				       char *buf)
{
	struct zcrypt_card *zc = to_ap_card(dev)->private;

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

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

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

	zc->online = online;
	id = zc->card->id;

	ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);

	spin_lock(&zcrypt_list_lock);
	list_for_each_entry(zq, &zc->zqueues, list)
		zcrypt_queue_force_online(zq, online);
	spin_unlock(&zcrypt_list_lock);
	return count;
}

static DEVICE_ATTR(online, 0644, zcrypt_card_online_show,
		   zcrypt_card_online_store);

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

static const struct attribute_group zcrypt_card_attr_group = {
	.attrs = zcrypt_card_attrs,
};

struct zcrypt_card *zcrypt_card_alloc(void)
{
	struct zcrypt_card *zc;

	zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
	if (!zc)
		return NULL;
	INIT_LIST_HEAD(&zc->list);
	INIT_LIST_HEAD(&zc->zqueues);
	kref_init(&zc->refcount);
	return zc;
}
EXPORT_SYMBOL(zcrypt_card_alloc);

void zcrypt_card_free(struct zcrypt_card *zc)
{
	kfree(zc);
}
EXPORT_SYMBOL(zcrypt_card_free);

static void zcrypt_card_release(struct kref *kref)
{
	struct zcrypt_card *zdev =
		container_of(kref, struct zcrypt_card, refcount);
	zcrypt_card_free(zdev);
}

void zcrypt_card_get(struct zcrypt_card *zc)
{
	kref_get(&zc->refcount);
}
EXPORT_SYMBOL(zcrypt_card_get);

int zcrypt_card_put(struct zcrypt_card *zc)
{
	return kref_put(&zc->refcount, zcrypt_card_release);
}
EXPORT_SYMBOL(zcrypt_card_put);

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

	rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
				&zcrypt_card_attr_group);
	if (rc)
		return rc;

	spin_lock(&zcrypt_list_lock);
	list_add_tail(&zc->list, &zcrypt_card_list);
	spin_unlock(&zcrypt_list_lock);

	zc->online = 1;

	ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);

	return rc;
}
EXPORT_SYMBOL(zcrypt_card_register);

/**
 * zcrypt_card_unregister(): Unregister a crypto card device.
 * @zc: Pointer to crypto card device
 *
 * Unregister a crypto card device.
 */
void zcrypt_card_unregister(struct zcrypt_card *zc)
{
	ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);

	spin_lock(&zcrypt_list_lock);
	list_del_init(&zc->list);
	spin_unlock(&zcrypt_list_lock);
	sysfs_remove_group(&zc->card->ap_dev.device.kobj,
			   &zcrypt_card_attr_group);
}
EXPORT_SYMBOL(zcrypt_card_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 card devices.
	39	*/
	40
	41	static ssize_t zcrypt_card_type_show(struct device *dev,
	42	struct device_attribute attr, char buf)
	43	{
	44	struct zcrypt_card *zc = to_ap_card(dev)->private;
	45
	46	return snprintf(buf, PAGE_SIZE, "%s\n", zc->type_string);
	47	}
	48
	49	static DEVICE_ATTR(type, 0444, zcrypt_card_type_show, NULL);
	50
	51	static ssize_t zcrypt_card_online_show(struct device *dev,
	52	struct device_attribute *attr,
	53	char *buf)
	54	{
	55	struct zcrypt_card *zc = to_ap_card(dev)->private;
	56
	57	return snprintf(buf, PAGE_SIZE, "%d\n", zc->online);
	58	}
	59
	60	static ssize_t zcrypt_card_online_store(struct device *dev,
	61	struct device_attribute *attr,
	62	const char *buf, size_t count)
	63	{
	64	struct zcrypt_card *zc = to_ap_card(dev)->private;
	65	struct zcrypt_queue *zq;
	66	int online, id;
	67
	68	if (sscanf(buf, "%d\n", &online) != 1 \|\| online < 0 \|\| online > 1)
	69	return -EINVAL;
	70
	71	zc->online = online;
	72	id = zc->card->id;
cccd85bf HF	73
	74	ZCRYPT_DBF(DBF_INFO, "card=%02x online=%d\n", id, online);
	75
e28d2af4 IT	76	spin_lock(&zcrypt_list_lock);
	77	list_for_each_entry(zq, &zc->zqueues, list)
	78	zcrypt_queue_force_online(zq, online);
	79	spin_unlock(&zcrypt_list_lock);
	80	return count;
	81	}
	82
	83	static DEVICE_ATTR(online, 0644, zcrypt_card_online_show,
	84	zcrypt_card_online_store);
	85
	86	static struct attribute *zcrypt_card_attrs[] = {
	87	&dev_attr_type.attr,
	88	&dev_attr_online.attr,
	89	NULL,
	90	};
	91
9731c0a9	92	static const struct attribute_group zcrypt_card_attr_group = {
e28d2af4 IT	93	.attrs = zcrypt_card_attrs,
	94	};
	95
	96	struct zcrypt_card *zcrypt_card_alloc(void)
	97	{
	98	struct zcrypt_card *zc;
	99
	100	zc = kzalloc(sizeof(struct zcrypt_card), GFP_KERNEL);
	101	if (!zc)
	102	return NULL;
	103	INIT_LIST_HEAD(&zc->list);
	104	INIT_LIST_HEAD(&zc->zqueues);
e28d2af4 IT	105	kref_init(&zc->refcount);
	106	return zc;
	107	}
	108	EXPORT_SYMBOL(zcrypt_card_alloc);
	109
	110	void zcrypt_card_free(struct zcrypt_card *zc)
	111	{
	112	kfree(zc);
	113	}
	114	EXPORT_SYMBOL(zcrypt_card_free);
	115
	116	static void zcrypt_card_release(struct kref *kref)
	117	{
	118	struct zcrypt_card *zdev =
	119	container_of(kref, struct zcrypt_card, refcount);
	120	zcrypt_card_free(zdev);
	121	}
	122
	123	void zcrypt_card_get(struct zcrypt_card *zc)
	124	{
	125	kref_get(&zc->refcount);
	126	}
	127	EXPORT_SYMBOL(zcrypt_card_get);
	128
	129	int zcrypt_card_put(struct zcrypt_card *zc)
	130	{
	131	return kref_put(&zc->refcount, zcrypt_card_release);
	132	}
	133	EXPORT_SYMBOL(zcrypt_card_put);
	134
	135	/**
	136	* zcrypt_card_register() - Register a crypto card device.
	137	* @zc: Pointer to a crypto card device
	138	*
	139	* Register a crypto card device. Returns 0 if successful.
	140	*/
	141	int zcrypt_card_register(struct zcrypt_card *zc)
	142	{
	143	int rc;
	144
	145	rc = sysfs_create_group(&zc->card->ap_dev.device.kobj,
	146	&zcrypt_card_attr_group);
	147	if (rc)
	148	return rc;
	149
	150	spin_lock(&zcrypt_list_lock);
	151	list_add_tail(&zc->list, &zcrypt_card_list);
	152	spin_unlock(&zcrypt_list_lock);
	153
	154	zc->online = 1;
cccd85bf HF	155
	156	ZCRYPT_DBF(DBF_INFO, "card=%02x register online=1\n", zc->card->id);
	157
e28d2af4 IT	158	return rc;
	159	}
	160	EXPORT_SYMBOL(zcrypt_card_register);
	161
	162	/**
	163	* zcrypt_card_unregister(): Unregister a crypto card device.
	164	* @zc: Pointer to crypto card device
	165	*
	166	* Unregister a crypto card device.
	167	*/
	168	void zcrypt_card_unregister(struct zcrypt_card *zc)
	169	{
cccd85bf HF	170	ZCRYPT_DBF(DBF_INFO, "card=%02x unregister\n", zc->card->id);
cccd85bf HF	171
e28d2af4 IT	172	spin_lock(&zcrypt_list_lock);
	173	list_del_init(&zc->list);
	174	spin_unlock(&zcrypt_list_lock);
	175	sysfs_remove_group(&zc->card->ap_dev.device.kobj,
	176	&zcrypt_card_attr_group);
	177	}
	178	EXPORT_SYMBOL(zcrypt_card_unregister);