[mirror_ubuntu-hirsute-kernel.git] / drivers / s390 / crypto / zcrypt_cex2a.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *  Copyright IBM Corp. 2001, 2012
 *  Author(s): Robert Burroughs
 *	       Eric Rossman (edrossma@us.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/slab.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/atomic.h>
#include <linux/uaccess.h>
#include <linux/mod_devicetable.h>

#include "ap_bus.h"
#include "zcrypt_api.h"
#include "zcrypt_error.h"
#include "zcrypt_cex2a.h"
#include "zcrypt_msgtype50.h"

#define CEX2A_MIN_MOD_SIZE	  1	/*    8 bits	*/
#define CEX2A_MAX_MOD_SIZE	256	/* 2048 bits	*/
#define CEX3A_MIN_MOD_SIZE	CEX2A_MIN_MOD_SIZE
#define CEX3A_MAX_MOD_SIZE	512	/* 4096 bits	*/

#define CEX2A_MAX_MESSAGE_SIZE	0x390	/* sizeof(struct type50_crb2_msg)    */
#define CEX2A_MAX_RESPONSE_SIZE 0x110	/* max outputdatalength + type80_hdr */

#define CEX3A_MAX_RESPONSE_SIZE	0x210	/* 512 bit modulus
					 * (max outputdatalength) +
					 * type80_hdr*/
#define CEX3A_MAX_MESSAGE_SIZE	sizeof(struct type50_crb3_msg)

#define CEX2A_CLEANUP_TIME	(15*HZ)
#define CEX3A_CLEANUP_TIME	CEX2A_CLEANUP_TIME

MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("CEX2A/CEX3A Cryptographic Coprocessor device driver, " \
		   "Copyright IBM Corp. 2001, 2018");
MODULE_LICENSE("GPL");

static struct ap_device_id zcrypt_cex2a_card_ids[] = {
	{ .dev_type = AP_DEVICE_TYPE_CEX2A,
	  .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
	{ .dev_type = AP_DEVICE_TYPE_CEX3A,
	  .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
	{ /* end of list */ },
};

MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_card_ids);

static struct ap_device_id zcrypt_cex2a_queue_ids[] = {
	{ .dev_type = AP_DEVICE_TYPE_CEX2A,
	  .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
	{ .dev_type = AP_DEVICE_TYPE_CEX3A,
	  .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
	{ /* end of list */ },
};

MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_queue_ids);

/**
 * Probe function for CEX2A card devices. It always accepts the AP device
 * since the bus_match already checked the card type.
 * @ap_dev: pointer to the AP device.
 */
static int zcrypt_cex2a_card_probe(struct ap_device *ap_dev)
{
	/*
	 * Normalized speed ratings per crypto adapter
	 * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
	 */
	static const int CEX2A_SPEED_IDX[] = {
		800, 1000, 2000,  900, 1200, 2400, 0, 0};
	static const int CEX3A_SPEED_IDX[] = {
		400,  500, 1000,  450,	550, 1200, 0, 0};

	struct ap_card *ac = to_ap_card(&ap_dev->device);
	struct zcrypt_card *zc;
	int rc = 0;

	zc = zcrypt_card_alloc();
	if (!zc)
		return -ENOMEM;
	zc->card = ac;
	ac->private = zc;

	if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A) {
		zc->min_mod_size = CEX2A_MIN_MOD_SIZE;
		zc->max_mod_size = CEX2A_MAX_MOD_SIZE;
		zc->speed_rating = CEX2A_SPEED_IDX;
		zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
		zc->type_string = "CEX2A";
		zc->user_space_type = ZCRYPT_CEX2A;
	} else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX3A) {
		zc->min_mod_size = CEX2A_MIN_MOD_SIZE;
		zc->max_mod_size = CEX2A_MAX_MOD_SIZE;
		zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
		if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) &&
		    ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) {
			zc->max_mod_size = CEX3A_MAX_MOD_SIZE;
			zc->max_exp_bit_length = CEX3A_MAX_MOD_SIZE;
		}
		zc->speed_rating = CEX3A_SPEED_IDX;
		zc->type_string = "CEX3A";
		zc->user_space_type = ZCRYPT_CEX3A;
	} else {
		zcrypt_card_free(zc);
		return -ENODEV;
	}
	zc->online = 1;

	rc = zcrypt_card_register(zc);
	if (rc) {
		ac->private = NULL;
		zcrypt_card_free(zc);
	}

	return rc;
}

/**
 * This is called to remove the CEX2A card driver information
 * if an AP card device is removed.
 */
static void zcrypt_cex2a_card_remove(struct ap_device *ap_dev)
{
	struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;

	if (zc)
		zcrypt_card_unregister(zc);
}

static struct ap_driver zcrypt_cex2a_card_driver = {
	.probe = zcrypt_cex2a_card_probe,
	.remove = zcrypt_cex2a_card_remove,
	.ids = zcrypt_cex2a_card_ids,
	.flags = AP_DRIVER_FLAG_DEFAULT,
};

/**
 * Probe function for CEX2A queue devices. It always accepts the AP device
 * since the bus_match already checked the queue type.
 * @ap_dev: pointer to the AP device.
 */
static int zcrypt_cex2a_queue_probe(struct ap_device *ap_dev)
{
	struct ap_queue *aq = to_ap_queue(&ap_dev->device);
	struct zcrypt_queue *zq = NULL;
	int rc;

	switch (ap_dev->device_type) {
	case AP_DEVICE_TYPE_CEX2A:
		zq = zcrypt_queue_alloc(CEX2A_MAX_RESPONSE_SIZE);
		if (!zq)
			return -ENOMEM;
		break;
	case AP_DEVICE_TYPE_CEX3A:
		zq = zcrypt_queue_alloc(CEX3A_MAX_RESPONSE_SIZE);
		if (!zq)
			return -ENOMEM;
		break;
	}
	if (!zq)
		return -ENODEV;
	zq->ops = zcrypt_msgtype(MSGTYPE50_NAME, MSGTYPE50_VARIANT_DEFAULT);
	zq->queue = aq;
	zq->online = 1;
	atomic_set(&zq->load, 0);
	ap_queue_init_state(aq);
	ap_queue_init_reply(aq, &zq->reply);
	aq->request_timeout = CEX2A_CLEANUP_TIME;
	aq->private = zq;
	rc = zcrypt_queue_register(zq);
	if (rc) {
		aq->private = NULL;
		zcrypt_queue_free(zq);
	}

	return rc;
}

/**
 * This is called to remove the CEX2A queue driver information
 * if an AP queue device is removed.
 */
static void zcrypt_cex2a_queue_remove(struct ap_device *ap_dev)
{
	struct ap_queue *aq = to_ap_queue(&ap_dev->device);
	struct zcrypt_queue *zq = aq->private;

	if (zq)
		zcrypt_queue_unregister(zq);
}

static struct ap_driver zcrypt_cex2a_queue_driver = {
	.probe = zcrypt_cex2a_queue_probe,
	.remove = zcrypt_cex2a_queue_remove,
	.ids = zcrypt_cex2a_queue_ids,
	.flags = AP_DRIVER_FLAG_DEFAULT,
};

int __init zcrypt_cex2a_init(void)
{
	int rc;

	rc = ap_driver_register(&zcrypt_cex2a_card_driver,
				THIS_MODULE, "cex2acard");
	if (rc)
		return rc;

	rc = ap_driver_register(&zcrypt_cex2a_queue_driver,
				THIS_MODULE, "cex2aqueue");
	if (rc)
		ap_driver_unregister(&zcrypt_cex2a_card_driver);

	return rc;
}

void __exit zcrypt_cex2a_exit(void)
{
	ap_driver_unregister(&zcrypt_cex2a_queue_driver);
	ap_driver_unregister(&zcrypt_cex2a_card_driver);
}

module_init(zcrypt_cex2a_init);
module_exit(zcrypt_cex2a_exit);
Commit	Line	Data
812141a9	1	// SPDX-License-Identifier: GPL-2.0+
963ed931	2	/*
5e55a488	3	* Copyright IBM Corp. 2001, 2012
963ed931 MS	4	* Author(s): Robert Burroughs
	5	* Eric Rossman (edrossma@us.ibm.com)
	6	*
	7	* Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
	8	* Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
	9	* Ralph Wuerthner <rwuerthn@de.ibm.com>
5e55a488	10	* MSGTYPE restruct: Holger Dengler <hd@linux.vnet.ibm.com>
963ed931 MS	11	*/
	12
	13	#include <linux/module.h>
5a0e3ad6	14	#include <linux/slab.h>
963ed931 MS	15	#include <linux/init.h>
963ed931 MS	16	#include <linux/err.h>
60063497	17	#include <linux/atomic.h>
7c0f6ba6	18	#include <linux/uaccess.h>
e28d2af4	19	#include <linux/mod_devicetable.h>
963ed931 MS	20
	21	#include "ap_bus.h"
	22	#include "zcrypt_api.h"
	23	#include "zcrypt_error.h"
	24	#include "zcrypt_cex2a.h"
5e55a488	25	#include "zcrypt_msgtype50.h"
963ed931 MS	26
	27	#define CEX2A_MIN_MOD_SIZE 1 /* 8 bits */
	28	#define CEX2A_MAX_MOD_SIZE 256 /* 2048 bits */
8e89b6be	29	#define CEX3A_MIN_MOD_SIZE CEX2A_MIN_MOD_SIZE
3e309a66	30	#define CEX3A_MAX_MOD_SIZE 512 /* 4096 bits */
963ed931	31
963ed931 MS	32	#define CEX2A_MAX_MESSAGE_SIZE 0x390 /* sizeof(struct type50_crb2_msg) */
	33	#define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */
	34
3e309a66 FB	35	#define CEX3A_MAX_RESPONSE_SIZE 0x210 /* 512 bit modulus
	36	* (max outputdatalength) +
	37	* type80_hdr*/
	38	#define CEX3A_MAX_MESSAGE_SIZE sizeof(struct type50_crb3_msg)
8e89b6be	39
963ed931	40	#define CEX2A_CLEANUP_TIME (15*HZ)
8e89b6be	41	#define CEX3A_CLEANUP_TIME CEX2A_CLEANUP_TIME
963ed931	42
963ed931	43	MODULE_AUTHOR("IBM Corporation");
ee410de8 HF	44	MODULE_DESCRIPTION("CEX2A/CEX3A Cryptographic Coprocessor device driver, " \
ee410de8 HF	45	"Copyright IBM Corp. 2001, 2018");
963ed931	46	MODULE_LICENSE("GPL");
963ed931	47
e28d2af4 IT	48	static struct ap_device_id zcrypt_cex2a_card_ids[] = {
	49	{ .dev_type = AP_DEVICE_TYPE_CEX2A,
	50	.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
	51	{ .dev_type = AP_DEVICE_TYPE_CEX3A,
	52	.match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
	53	{ /* end of list */ },
	54	};
	55
	56	MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_card_ids);
963ed931	57
e28d2af4 IT	58	static struct ap_device_id zcrypt_cex2a_queue_ids[] = {
	59	{ .dev_type = AP_DEVICE_TYPE_CEX2A,
	60	.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
	61	{ .dev_type = AP_DEVICE_TYPE_CEX3A,
	62	.match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
	63	{ /* end of list */ },
963ed931 MS	64	};
963ed931 MS	65
e28d2af4 IT	66	MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_queue_ids);
e28d2af4 IT	67
963ed931	68	/**
e28d2af4 IT	69	* Probe function for CEX2A card devices. It always accepts the AP device
e28d2af4 IT	70	* since the bus_match already checked the card type.
963ed931 MS	71	* @ap_dev: pointer to the AP device.
963ed931 MS	72	*/
e28d2af4	73	static int zcrypt_cex2a_card_probe(struct ap_device *ap_dev)
963ed931	74	{
e28d2af4 IT	75	/*
	76	* Normalized speed ratings per crypto adapter
	77	* MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
	78	*/
	79	static const int CEX2A_SPEED_IDX[] = {
	80	800, 1000, 2000, 900, 1200, 2400, 0, 0};
	81	static const int CEX3A_SPEED_IDX[] = {
	82	400, 500, 1000, 450, 550, 1200, 0, 0};
	83
	84	struct ap_card *ac = to_ap_card(&ap_dev->device);
	85	struct zcrypt_card *zc;
8e89b6be FB	86	int rc = 0;
8e89b6be FB	87
e28d2af4 IT	88	zc = zcrypt_card_alloc();
	89	if (!zc)
	90	return -ENOMEM;
	91	zc->card = ac;
	92	ac->private = zc;
	93
	94	if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX2A) {
	95	zc->min_mod_size = CEX2A_MIN_MOD_SIZE;
	96	zc->max_mod_size = CEX2A_MAX_MOD_SIZE;
91ffc519	97	zc->speed_rating = CEX2A_SPEED_IDX;
e28d2af4 IT	98	zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
	99	zc->type_string = "CEX2A";
	100	zc->user_space_type = ZCRYPT_CEX2A;
	101	} else if (ac->ap_dev.device_type == AP_DEVICE_TYPE_CEX3A) {
	102	zc->min_mod_size = CEX2A_MIN_MOD_SIZE;
	103	zc->max_mod_size = CEX2A_MAX_MOD_SIZE;
	104	zc->max_exp_bit_length = CEX2A_MAX_MOD_SIZE;
	105	if (ap_test_bit(&ac->functions, AP_FUNC_MEX4K) &&
	106	ap_test_bit(&ac->functions, AP_FUNC_CRT4K)) {
	107	zc->max_mod_size = CEX3A_MAX_MOD_SIZE;
	108	zc->max_exp_bit_length = CEX3A_MAX_MOD_SIZE;
	109	}
91ffc519	110	zc->speed_rating = CEX3A_SPEED_IDX;
e28d2af4 IT	111	zc->type_string = "CEX3A";
	112	zc->user_space_type = ZCRYPT_CEX3A;
	113	} else {
	114	zcrypt_card_free(zc);
	115	return -ENODEV;
	116	}
	117	zc->online = 1;
	118
	119	rc = zcrypt_card_register(zc);
	120	if (rc) {
	121	ac->private = NULL;
	122	zcrypt_card_free(zc);
	123	}
	124
	125	return rc;
	126	}
	127
	128	/**
	129	* This is called to remove the CEX2A card driver information
	130	* if an AP card device is removed.
	131	*/
	132	static void zcrypt_cex2a_card_remove(struct ap_device *ap_dev)
	133	{
	134	struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
	135
	136	if (zc)
	137	zcrypt_card_unregister(zc);
	138	}
	139
	140	static struct ap_driver zcrypt_cex2a_card_driver = {
	141	.probe = zcrypt_cex2a_card_probe,
	142	.remove = zcrypt_cex2a_card_remove,
	143	.ids = zcrypt_cex2a_card_ids,
7e0bdbe5	144	.flags = AP_DRIVER_FLAG_DEFAULT,
e28d2af4 IT	145	};
	146
	147	/**
	148	* Probe function for CEX2A queue devices. It always accepts the AP device
	149	* since the bus_match already checked the queue type.
	150	* @ap_dev: pointer to the AP device.
	151	*/
	152	static int zcrypt_cex2a_queue_probe(struct ap_device *ap_dev)
	153	{
	154	struct ap_queue *aq = to_ap_queue(&ap_dev->device);
	155	struct zcrypt_queue *zq = NULL;
	156	int rc;
	157
8e89b6be FB	158	switch (ap_dev->device_type) {
8e89b6be FB	159	case AP_DEVICE_TYPE_CEX2A:
e28d2af4 IT	160	zq = zcrypt_queue_alloc(CEX2A_MAX_RESPONSE_SIZE);
e28d2af4 IT	161	if (!zq)
8e89b6be	162	return -ENOMEM;
8e89b6be FB	163	break;
8e89b6be FB	164	case AP_DEVICE_TYPE_CEX3A:
e28d2af4 IT	165	zq = zcrypt_queue_alloc(CEX3A_MAX_RESPONSE_SIZE);
e28d2af4 IT	166	if (!zq)
8e89b6be	167	return -ENOMEM;
8e89b6be FB	168	break;
8e89b6be FB	169	}
e28d2af4	170	if (!zq)
5e55a488	171	return -ENODEV;
e28d2af4 IT	172	zq->ops = zcrypt_msgtype(MSGTYPE50_NAME, MSGTYPE50_VARIANT_DEFAULT);
	173	zq->queue = aq;
	174	zq->online = 1;
	175	atomic_set(&zq->load, 0);
0c874cd0	176	ap_queue_init_state(aq);
e28d2af4	177	ap_queue_init_reply(aq, &zq->reply);
dfdc6e73	178	aq->request_timeout = CEX2A_CLEANUP_TIME;
e28d2af4 IT	179	aq->private = zq;
e28d2af4 IT	180	rc = zcrypt_queue_register(zq);
8e89b6be	181	if (rc) {
e28d2af4 IT	182	aq->private = NULL;
e28d2af4 IT	183	zcrypt_queue_free(zq);
8e89b6be	184	}
e28d2af4	185
963ed931 MS	186	return rc;
	187	}
	188
	189	/**
e28d2af4 IT	190	* This is called to remove the CEX2A queue driver information
e28d2af4 IT	191	* if an AP queue device is removed.
963ed931	192	*/
e28d2af4	193	static void zcrypt_cex2a_queue_remove(struct ap_device *ap_dev)
963ed931	194	{
e28d2af4 IT	195	struct ap_queue *aq = to_ap_queue(&ap_dev->device);
e28d2af4 IT	196	struct zcrypt_queue *zq = aq->private;
963ed931	197
e28d2af4 IT	198	if (zq)
e28d2af4 IT	199	zcrypt_queue_unregister(zq);
963ed931 MS	200	}
963ed931 MS	201
e28d2af4 IT	202	static struct ap_driver zcrypt_cex2a_queue_driver = {
	203	.probe = zcrypt_cex2a_queue_probe,
	204	.remove = zcrypt_cex2a_queue_remove,
e28d2af4	205	.ids = zcrypt_cex2a_queue_ids,
7e0bdbe5	206	.flags = AP_DRIVER_FLAG_DEFAULT,
e28d2af4 IT	207	};
e28d2af4 IT	208
963ed931 MS	209	int __init zcrypt_cex2a_init(void)
963ed931 MS	210	{
e28d2af4 IT	211	int rc;
	212
	213	rc = ap_driver_register(&zcrypt_cex2a_card_driver,
	214	THIS_MODULE, "cex2acard");
	215	if (rc)
	216	return rc;
	217
	218	rc = ap_driver_register(&zcrypt_cex2a_queue_driver,
	219	THIS_MODULE, "cex2aqueue");
	220	if (rc)
	221	ap_driver_unregister(&zcrypt_cex2a_card_driver);
	222
	223	return rc;
963ed931 MS	224	}
	225
	226	void __exit zcrypt_cex2a_exit(void)
	227	{
e28d2af4 IT	228	ap_driver_unregister(&zcrypt_cex2a_queue_driver);
e28d2af4 IT	229	ap_driver_unregister(&zcrypt_cex2a_card_driver);
963ed931 MS	230	}
963ed931 MS	231
963ed931 MS	232	module_init(zcrypt_cex2a_init);
963ed931 MS	233	module_exit(zcrypt_cex2a_exit);