[deliverable/linux.git] / drivers / s390 / crypto / zcrypt_cex2a.c

/*
 *  linux/drivers/s390/crypto/zcrypt_cex2a.c
 *
 *  zcrypt 2.1.0
 *
 *  Copyright (C)  2001, 2006 IBM Corporation
 *  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>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>

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

#define CEX2A_MIN_MOD_SIZE	  1	/*    8 bits	*/
#define CEX2A_MAX_MOD_SIZE	256	/* 2048 bits	*/

#define CEX2A_SPEED_RATING	970

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

#define CEX2A_CLEANUP_TIME	(15*HZ)

static struct ap_device_id zcrypt_cex2a_ids[] = {
	{ AP_DEVICE(AP_DEVICE_TYPE_CEX2A) },
	{ AP_DEVICE(AP_DEVICE_TYPE_CEX2A2) },
	{ /* end of list */ },
};

#ifndef CONFIG_ZCRYPT_MONOLITHIC
MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_ids);
MODULE_AUTHOR("IBM Corporation");
MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, "
		   "Copyright 2001, 2006 IBM Corporation");
MODULE_LICENSE("GPL");
#endif

static int zcrypt_cex2a_probe(struct ap_device *ap_dev);
static void zcrypt_cex2a_remove(struct ap_device *ap_dev);
static void zcrypt_cex2a_receive(struct ap_device *, struct ap_message *,
				 struct ap_message *);

static struct ap_driver zcrypt_cex2a_driver = {
	.probe = zcrypt_cex2a_probe,
	.remove = zcrypt_cex2a_remove,
	.receive = zcrypt_cex2a_receive,
	.ids = zcrypt_cex2a_ids,
	.request_timeout = CEX2A_CLEANUP_TIME,
};

/**
 * Convert a ICAMEX message to a type50 MEX message.
 *
 * @zdev: crypto device pointer
 * @zreq: crypto request pointer
 * @mex: pointer to user input data
 *
 * Returns 0 on success or -EFAULT.
 */
static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_device *zdev,
				       struct ap_message *ap_msg,
				       struct ica_rsa_modexpo *mex)
{
	unsigned char *mod, *exp, *inp;
	int mod_len;

	mod_len = mex->inputdatalength;

	if (mod_len <= 128) {
		struct type50_meb1_msg *meb1 = ap_msg->message;
		memset(meb1, 0, sizeof(*meb1));
		ap_msg->length = sizeof(*meb1);
		meb1->header.msg_type_code = TYPE50_TYPE_CODE;
		meb1->header.msg_len = sizeof(*meb1);
		meb1->keyblock_type = TYPE50_MEB1_FMT;
		mod = meb1->modulus + sizeof(meb1->modulus) - mod_len;
		exp = meb1->exponent + sizeof(meb1->exponent) - mod_len;
		inp = meb1->message + sizeof(meb1->message) - mod_len;
	} else {
		struct type50_meb2_msg *meb2 = ap_msg->message;
		memset(meb2, 0, sizeof(*meb2));
		ap_msg->length = sizeof(*meb2);
		meb2->header.msg_type_code = TYPE50_TYPE_CODE;
		meb2->header.msg_len = sizeof(*meb2);
		meb2->keyblock_type = TYPE50_MEB2_FMT;
		mod = meb2->modulus + sizeof(meb2->modulus) - mod_len;
		exp = meb2->exponent + sizeof(meb2->exponent) - mod_len;
		inp = meb2->message + sizeof(meb2->message) - mod_len;
	}

	if (copy_from_user(mod, mex->n_modulus, mod_len) ||
	    copy_from_user(exp, mex->b_key, mod_len) ||
	    copy_from_user(inp, mex->inputdata, mod_len))
		return -EFAULT;
	return 0;
}

/**
 * Convert a ICACRT message to a type50 CRT message.
 *
 * @zdev: crypto device pointer
 * @zreq: crypto request pointer
 * @crt: pointer to user input data
 *
 * Returns 0 on success or -EFAULT.
 */
static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_device *zdev,
				       struct ap_message *ap_msg,
				       struct ica_rsa_modexpo_crt *crt)
{
	int mod_len, short_len, long_len, long_offset;
	unsigned char *p, *q, *dp, *dq, *u, *inp;

	mod_len = crt->inputdatalength;
	short_len = mod_len / 2;
	long_len = mod_len / 2 + 8;

	/*
	 * CEX2A cannot handle p, dp, or U > 128 bytes.
	 * If we have one of these, we need to do extra checking.
	 */
	if (long_len > 128) {
		/*
		 * zcrypt_rsa_crt already checked for the leading
		 * zeroes of np_prime, bp_key and u_mult_inc.
		 */
		long_offset = long_len - 128;
		long_len = 128;
	} else
		long_offset = 0;

	/*
	 * Instead of doing extra work for p, dp, U > 64 bytes, we'll just use
	 * the larger message structure.
	 */
	if (long_len <= 64) {
		struct type50_crb1_msg *crb1 = ap_msg->message;
		memset(crb1, 0, sizeof(*crb1));
		ap_msg->length = sizeof(*crb1);
		crb1->header.msg_type_code = TYPE50_TYPE_CODE;
		crb1->header.msg_len = sizeof(*crb1);
		crb1->keyblock_type = TYPE50_CRB1_FMT;
		p = crb1->p + sizeof(crb1->p) - long_len;
		q = crb1->q + sizeof(crb1->q) - short_len;
		dp = crb1->dp + sizeof(crb1->dp) - long_len;
		dq = crb1->dq + sizeof(crb1->dq) - short_len;
		u = crb1->u + sizeof(crb1->u) - long_len;
		inp = crb1->message + sizeof(crb1->message) - mod_len;
	} else {
		struct type50_crb2_msg *crb2 = ap_msg->message;
		memset(crb2, 0, sizeof(*crb2));
		ap_msg->length = sizeof(*crb2);
		crb2->header.msg_type_code = TYPE50_TYPE_CODE;
		crb2->header.msg_len = sizeof(*crb2);
		crb2->keyblock_type = TYPE50_CRB2_FMT;
		p = crb2->p + sizeof(crb2->p) - long_len;
		q = crb2->q + sizeof(crb2->q) - short_len;
		dp = crb2->dp + sizeof(crb2->dp) - long_len;
		dq = crb2->dq + sizeof(crb2->dq) - short_len;
		u = crb2->u + sizeof(crb2->u) - long_len;
		inp = crb2->message + sizeof(crb2->message) - mod_len;
	}

	if (copy_from_user(p, crt->np_prime + long_offset, long_len) ||
	    copy_from_user(q, crt->nq_prime, short_len) ||
	    copy_from_user(dp, crt->bp_key + long_offset, long_len) ||
	    copy_from_user(dq, crt->bq_key, short_len) ||
	    copy_from_user(u, crt->u_mult_inv + long_offset, long_len) ||
	    copy_from_user(inp, crt->inputdata, mod_len))
		return -EFAULT;


	return 0;
}

/**
 * Copy results from a type 80 reply message back to user space.
 *
 * @zdev: crypto device pointer
 * @reply: reply AP message.
 * @data: pointer to user output data
 * @length: size of user output data
 *
 * Returns 0 on success or -EFAULT.
 */
static int convert_type80(struct zcrypt_device *zdev,
			  struct ap_message *reply,
			  char __user *outputdata,
			  unsigned int outputdatalength)
{
	struct type80_hdr *t80h = reply->message;
	unsigned char *data;

	if (t80h->len < sizeof(*t80h) + outputdatalength) {
		/* The result is too short, the CEX2A card may not do that.. */
		zdev->online = 0;
		return -EAGAIN;	/* repeat the request on a different device. */
	}
	BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE);
	data = reply->message + t80h->len - outputdatalength;
	if (copy_to_user(outputdata, data, outputdatalength))
		return -EFAULT;
	return 0;
}

static int convert_response(struct zcrypt_device *zdev,
			    struct ap_message *reply,
			    char __user *outputdata,
			    unsigned int outputdatalength)
{
	/* Response type byte is the second byte in the response. */
	switch (((unsigned char *) reply->message)[1]) {
	case TYPE82_RSP_CODE:
	case TYPE88_RSP_CODE:
		return convert_error(zdev, reply);
	case TYPE80_RSP_CODE:
		return convert_type80(zdev, reply,
				      outputdata, outputdatalength);
	default: /* Unknown response type, this should NEVER EVER happen */
		zdev->online = 0;
		return -EAGAIN;	/* repeat the request on a different device. */
	}
}

/**
 * This function is called from the AP bus code after a crypto request
 * "msg" has finished with the reply message "reply".
 * It is called from tasklet context.
 * @ap_dev: pointer to the AP device
 * @msg: pointer to the AP message
 * @reply: pointer to the AP reply message
 */
static void zcrypt_cex2a_receive(struct ap_device *ap_dev,
				 struct ap_message *msg,
				 struct ap_message *reply)
{
	static struct error_hdr error_reply = {
		.type = TYPE82_RSP_CODE,
		.reply_code = REP82_ERROR_MACHINE_FAILURE,
	};
	struct type80_hdr *t80h = reply->message;
	int length;

	/* Copy the reply message to the request message buffer. */
	if (IS_ERR(reply))
		memcpy(msg->message, &error_reply, sizeof(error_reply));
	else if (t80h->type == TYPE80_RSP_CODE) {
		length = min(CEX2A_MAX_RESPONSE_SIZE, (int) t80h->len);
		memcpy(msg->message, reply->message, length);
	} else
		memcpy(msg->message, reply->message, sizeof error_reply);
	complete((struct completion *) msg->private);
}

static atomic_t zcrypt_step = ATOMIC_INIT(0);

/**
 * The request distributor calls this function if it picked the CEX2A
 * device to handle a modexpo request.
 * @zdev: pointer to zcrypt_device structure that identifies the
 *	  CEX2A device to the request distributor
 * @mex: pointer to the modexpo request buffer
 */
static long zcrypt_cex2a_modexpo(struct zcrypt_device *zdev,
				 struct ica_rsa_modexpo *mex)
{
	struct ap_message ap_msg;
	struct completion work;
	int rc;

	ap_msg.message = kmalloc(CEX2A_MAX_MESSAGE_SIZE, GFP_KERNEL);
	if (!ap_msg.message)
		return -ENOMEM;
	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg.private = &work;
	rc = ICAMEX_msg_to_type50MEX_msg(zdev, &ap_msg, mex);
	if (rc)
		goto out_free;
	init_completion(&work);
	ap_queue_message(zdev->ap_dev, &ap_msg);
	rc = wait_for_completion_interruptible(&work);
	if (rc == 0)
		rc = convert_response(zdev, &ap_msg, mex->outputdata,
				      mex->outputdatalength);
	else
		/* Signal pending. */
		ap_cancel_message(zdev->ap_dev, &ap_msg);
out_free:
	kfree(ap_msg.message);
	return rc;
}

/**
 * The request distributor calls this function if it picked the CEX2A
 * device to handle a modexpo_crt request.
 * @zdev: pointer to zcrypt_device structure that identifies the
 *	  CEX2A device to the request distributor
 * @crt: pointer to the modexpoc_crt request buffer
 */
static long zcrypt_cex2a_modexpo_crt(struct zcrypt_device *zdev,
				     struct ica_rsa_modexpo_crt *crt)
{
	struct ap_message ap_msg;
	struct completion work;
	int rc;

	ap_msg.message = kmalloc(CEX2A_MAX_MESSAGE_SIZE, GFP_KERNEL);
	if (!ap_msg.message)
		return -ENOMEM;
	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg.private = &work;
	rc = ICACRT_msg_to_type50CRT_msg(zdev, &ap_msg, crt);
	if (rc)
		goto out_free;
	init_completion(&work);
	ap_queue_message(zdev->ap_dev, &ap_msg);
	rc = wait_for_completion_interruptible(&work);
	if (rc == 0)
		rc = convert_response(zdev, &ap_msg, crt->outputdata,
				      crt->outputdatalength);
	else
		/* Signal pending. */
		ap_cancel_message(zdev->ap_dev, &ap_msg);
out_free:
	kfree(ap_msg.message);
	return rc;
}

/**
 * The crypto operations for a CEX2A card.
 */
static struct zcrypt_ops zcrypt_cex2a_ops = {
	.rsa_modexpo = zcrypt_cex2a_modexpo,
	.rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt,
};

/**
 * Probe function for CEX2A cards. It always accepts the AP device
 * since the bus_match already checked the hardware type.
 * @ap_dev: pointer to the AP device.
 */
static int zcrypt_cex2a_probe(struct ap_device *ap_dev)
{
	struct zcrypt_device *zdev;
	int rc;

	zdev = zcrypt_device_alloc(CEX2A_MAX_RESPONSE_SIZE);
	if (!zdev)
		return -ENOMEM;
	zdev->ap_dev = ap_dev;
	zdev->ops = &zcrypt_cex2a_ops;
	zdev->online = 1;
	zdev->user_space_type = ZCRYPT_CEX2A;
	zdev->type_string = "CEX2A";
	zdev->min_mod_size = CEX2A_MIN_MOD_SIZE;
	zdev->max_mod_size = CEX2A_MAX_MOD_SIZE;
	zdev->short_crt = 1;
	zdev->speed_rating = CEX2A_SPEED_RATING;
	ap_dev->reply = &zdev->reply;
	ap_dev->private = zdev;
	rc = zcrypt_device_register(zdev);
	if (rc)
		goto out_free;
	return 0;

out_free:
	ap_dev->private = NULL;
	zcrypt_device_free(zdev);
	return rc;
}

/**
 * This is called to remove the extended CEX2A driver information
 * if an AP device is removed.
 */
static void zcrypt_cex2a_remove(struct ap_device *ap_dev)
{
	struct zcrypt_device *zdev = ap_dev->private;

	zcrypt_device_unregister(zdev);
}

int __init zcrypt_cex2a_init(void)
{
	return ap_driver_register(&zcrypt_cex2a_driver, THIS_MODULE, "cex2a");
}

void __exit zcrypt_cex2a_exit(void)
{
	ap_driver_unregister(&zcrypt_cex2a_driver);
}

#ifndef CONFIG_ZCRYPT_MONOLITHIC
module_init(zcrypt_cex2a_init);
module_exit(zcrypt_cex2a_exit);
#endif
Commit	Line	Data
963ed931 MS	1	/*
	2	* linux/drivers/s390/crypto/zcrypt_cex2a.c
	3	*
5432114b	4	* zcrypt 2.1.0
963ed931 MS	5	*
	6	* Copyright (C) 2001, 2006 IBM Corporation
	7	* Author(s): Robert Burroughs
	8	* Eric Rossman (edrossma@us.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	*
	14	* This program is free software; you can redistribute it and/or modify
	15	* it under the terms of the GNU General Public License as published by
	16	* the Free Software Foundation; either version 2, or (at your option)
	17	* any later version.
	18	*
	19	* This program is distributed in the hope that it will be useful,
	20	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	21	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	22	* GNU General Public License for more details.
	23	*
	24	* You should have received a copy of the GNU General Public License
	25	* along with this program; if not, write to the Free Software
	26	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	27	*/
	28
	29	#include <linux/module.h>
	30	#include <linux/init.h>
	31	#include <linux/err.h>
	32	#include <asm/atomic.h>
	33	#include <asm/uaccess.h>
	34
	35	#include "ap_bus.h"
	36	#include "zcrypt_api.h"
	37	#include "zcrypt_error.h"
	38	#include "zcrypt_cex2a.h"
	39
	40	#define CEX2A_MIN_MOD_SIZE 1 /* 8 bits */
	41	#define CEX2A_MAX_MOD_SIZE 256 /* 2048 bits */
	42
	43	#define CEX2A_SPEED_RATING 970
	44
	45	#define CEX2A_MAX_MESSAGE_SIZE 0x390 /* sizeof(struct type50_crb2_msg) */
	46	#define CEX2A_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */
	47
	48	#define CEX2A_CLEANUP_TIME (15*HZ)
	49
	50	static struct ap_device_id zcrypt_cex2a_ids[] = {
	51	{ AP_DEVICE(AP_DEVICE_TYPE_CEX2A) },
d8c33d32	52	{ AP_DEVICE(AP_DEVICE_TYPE_CEX2A2) },
963ed931 MS	53	{ /* end of list */ },
	54	};
	55
	56	#ifndef CONFIG_ZCRYPT_MONOLITHIC
	57	MODULE_DEVICE_TABLE(ap, zcrypt_cex2a_ids);
	58	MODULE_AUTHOR("IBM Corporation");
	59	MODULE_DESCRIPTION("CEX2A Cryptographic Coprocessor device driver, "
	60	"Copyright 2001, 2006 IBM Corporation");
	61	MODULE_LICENSE("GPL");
	62	#endif
	63
	64	static int zcrypt_cex2a_probe(struct ap_device *ap_dev);
	65	static void zcrypt_cex2a_remove(struct ap_device *ap_dev);
	66	static void zcrypt_cex2a_receive(struct ap_device , struct ap_message ,
	67	struct ap_message *);
	68
	69	static struct ap_driver zcrypt_cex2a_driver = {
	70	.probe = zcrypt_cex2a_probe,
	71	.remove = zcrypt_cex2a_remove,
	72	.receive = zcrypt_cex2a_receive,
	73	.ids = zcrypt_cex2a_ids,
af512ed0	74	.request_timeout = CEX2A_CLEANUP_TIME,
963ed931 MS	75	};
	76
	77	/**
	78	* Convert a ICAMEX message to a type50 MEX message.
	79	*
	80	* @zdev: crypto device pointer
	81	* @zreq: crypto request pointer
	82	* @mex: pointer to user input data
	83	*
	84	* Returns 0 on success or -EFAULT.
	85	*/
	86	static int ICAMEX_msg_to_type50MEX_msg(struct zcrypt_device *zdev,
	87	struct ap_message *ap_msg,
	88	struct ica_rsa_modexpo *mex)
	89	{
	90	unsigned char mod, exp, *inp;
	91	int mod_len;
	92
	93	mod_len = mex->inputdatalength;
	94
	95	if (mod_len <= 128) {
	96	struct type50_meb1_msg *meb1 = ap_msg->message;
	97	memset(meb1, 0, sizeof(*meb1));
	98	ap_msg->length = sizeof(*meb1);
	99	meb1->header.msg_type_code = TYPE50_TYPE_CODE;
	100	meb1->header.msg_len = sizeof(*meb1);
	101	meb1->keyblock_type = TYPE50_MEB1_FMT;
	102	mod = meb1->modulus + sizeof(meb1->modulus) - mod_len;
	103	exp = meb1->exponent + sizeof(meb1->exponent) - mod_len;
	104	inp = meb1->message + sizeof(meb1->message) - mod_len;
	105	} else {
	106	struct type50_meb2_msg *meb2 = ap_msg->message;
	107	memset(meb2, 0, sizeof(*meb2));
	108	ap_msg->length = sizeof(*meb2);
	109	meb2->header.msg_type_code = TYPE50_TYPE_CODE;
	110	meb2->header.msg_len = sizeof(*meb2);
	111	meb2->keyblock_type = TYPE50_MEB2_FMT;
	112	mod = meb2->modulus + sizeof(meb2->modulus) - mod_len;
	113	exp = meb2->exponent + sizeof(meb2->exponent) - mod_len;
	114	inp = meb2->message + sizeof(meb2->message) - mod_len;
	115	}
	116
	117	if (copy_from_user(mod, mex->n_modulus, mod_len) \|\|
	118	copy_from_user(exp, mex->b_key, mod_len) \|\|
	119	copy_from_user(inp, mex->inputdata, mod_len))
	120	return -EFAULT;
	121	return 0;
	122	}
	123
	124	/**
	125	* Convert a ICACRT message to a type50 CRT message.
	126	*
	127	* @zdev: crypto device pointer
	128	* @zreq: crypto request pointer
	129	* @crt: pointer to user input data
	130	*
	131	* Returns 0 on success or -EFAULT.
	132	*/
	133	static int ICACRT_msg_to_type50CRT_msg(struct zcrypt_device *zdev,
	134	struct ap_message *ap_msg,
	135	struct ica_rsa_modexpo_crt *crt)
	136	{
	137	int mod_len, short_len, long_len, long_offset;
	138	unsigned char p, q, dp, dq, u, inp;
139
140	mod_len = crt->inputdatalength;
141	short_len = mod_len / 2;
142	long_len = mod_len / 2 + 8;
143
144	/*
145	* CEX2A cannot handle p, dp, or U > 128 bytes.
146	* If we have one of these, we need to do extra checking.
147	*/
148	if (long_len > 128) {
149	/*
150	* zcrypt_rsa_crt already checked for the leading
151	* zeroes of np_prime, bp_key and u_mult_inc.
152	*/
153	long_offset = long_len - 128;
154	long_len = 128;
155	} else
156	long_offset = 0;
157
158	/*
159	* Instead of doing extra work for p, dp, U > 64 bytes, we'll just use
160	* the larger message structure.
161	*/
162	if (long_len <= 64) {
163	struct type50_crb1_msg *crb1 = ap_msg->message;
164	memset(crb1, 0, sizeof(*crb1));
165	ap_msg->length = sizeof(*crb1);
166	crb1->header.msg_type_code = TYPE50_TYPE_CODE;
167	crb1->header.msg_len = sizeof(*crb1);
168	crb1->keyblock_type = TYPE50_CRB1_FMT;
169	p = crb1->p + sizeof(crb1->p) - long_len;
170	q = crb1->q + sizeof(crb1->q) - short_len;
171	dp = crb1->dp + sizeof(crb1->dp) - long_len;
172	dq = crb1->dq + sizeof(crb1->dq) - short_len;
173	u = crb1->u + sizeof(crb1->u) - long_len;
174	inp = crb1->message + sizeof(crb1->message) - mod_len;
175	} else {
176	struct type50_crb2_msg *crb2 = ap_msg->message;
177	memset(crb2, 0, sizeof(*crb2));
178	ap_msg->length = sizeof(*crb2);
179	crb2->header.msg_type_code = TYPE50_TYPE_CODE;
180	crb2->header.msg_len = sizeof(*crb2);
181	crb2->keyblock_type = TYPE50_CRB2_FMT;
182	p = crb2->p + sizeof(crb2->p) - long_len;
183	q = crb2->q + sizeof(crb2->q) - short_len;
184	dp = crb2->dp + sizeof(crb2->dp) - long_len;
185	dq = crb2->dq + sizeof(crb2->dq) - short_len;
186	u = crb2->u + sizeof(crb2->u) - long_len;
187	inp = crb2->message + sizeof(crb2->message) - mod_len;
188	}
189
190	if (copy_from_user(p, crt->np_prime + long_offset, long_len) \|\|
191	copy_from_user(q, crt->nq_prime, short_len) \|\|
192	copy_from_user(dp, crt->bp_key + long_offset, long_len) \|\|
193	copy_from_user(dq, crt->bq_key, short_len) \|\|
194	copy_from_user(u, crt->u_mult_inv + long_offset, long_len) \|\|
195	copy_from_user(inp, crt->inputdata, mod_len))
196	return -EFAULT;
197
198
199	return 0;
200	}
201
202	/**
203	* Copy results from a type 80 reply message back to user space.
204	*
205	* @zdev: crypto device pointer
206	* @reply: reply AP message.
207	* @data: pointer to user output data
208	* @length: size of user output data
209	*
210	* Returns 0 on success or -EFAULT.
211	*/
212	static int convert_type80(struct zcrypt_device *zdev,
213	struct ap_message *reply,
214	char __user *outputdata,
215	unsigned int outputdatalength)
216	{
217	struct type80_hdr *t80h = reply->message;
218	unsigned char *data;
219
220	if (t80h->len < sizeof(*t80h) + outputdatalength) {
221	/* The result is too short, the CEX2A card may not do that.. */
222	zdev->online = 0;
223	return -EAGAIN; /* repeat the request on a different device. */
224	}
225	BUG_ON(t80h->len > CEX2A_MAX_RESPONSE_SIZE);
226	data = reply->message + t80h->len - outputdatalength;
227	if (copy_to_user(outputdata, data, outputdatalength))
228	return -EFAULT;
229	return 0;
230	}
231
232	static int convert_response(struct zcrypt_device *zdev,
233	struct ap_message *reply,
234	char __user *outputdata,
235	unsigned int outputdatalength)
236	{
237	/* Response type byte is the second byte in the response. */
238	switch (((unsigned char *) reply->message)[1]) {
239	case TYPE82_RSP_CODE:
240	case TYPE88_RSP_CODE:
241	return convert_error(zdev, reply);
242	case TYPE80_RSP_CODE:
243	return convert_type80(zdev, reply,
244	outputdata, outputdatalength);
245	default: /* Unknown response type, this should NEVER EVER happen */
963ed931 MS	246	zdev->online = 0;
	247	return -EAGAIN; /* repeat the request on a different device. */
	248	}
	249	}
	250
	251	/**
	252	* This function is called from the AP bus code after a crypto request
	253	* "msg" has finished with the reply message "reply".
	254	* It is called from tasklet context.
	255	* @ap_dev: pointer to the AP device
	256	* @msg: pointer to the AP message
	257	* @reply: pointer to the AP reply message
	258	*/
	259	static void zcrypt_cex2a_receive(struct ap_device *ap_dev,
	260	struct ap_message *msg,
	261	struct ap_message *reply)
	262	{
	263	static struct error_hdr error_reply = {
	264	.type = TYPE82_RSP_CODE,
	265	.reply_code = REP82_ERROR_MACHINE_FAILURE,
	266	};
	267	struct type80_hdr *t80h = reply->message;
	268	int length;
	269
	270	/* Copy the reply message to the request message buffer. */
	271	if (IS_ERR(reply))
	272	memcpy(msg->message, &error_reply, sizeof(error_reply));
	273	else if (t80h->type == TYPE80_RSP_CODE) {
	274	length = min(CEX2A_MAX_RESPONSE_SIZE, (int) t80h->len);
	275	memcpy(msg->message, reply->message, length);
	276	} else
	277	memcpy(msg->message, reply->message, sizeof error_reply);
	278	complete((struct completion *) msg->private);
	279	}
	280
	281	static atomic_t zcrypt_step = ATOMIC_INIT(0);
	282
	283	/**
	284	* The request distributor calls this function if it picked the CEX2A
	285	* device to handle a modexpo request.
	286	* @zdev: pointer to zcrypt_device structure that identifies the
	287	* CEX2A device to the request distributor
	288	* @mex: pointer to the modexpo request buffer
	289	*/
	290	static long zcrypt_cex2a_modexpo(struct zcrypt_device *zdev,
	291	struct ica_rsa_modexpo *mex)
	292	{
	293	struct ap_message ap_msg;
	294	struct completion work;
	295	int rc;
	296
5cbded58	297	ap_msg.message = kmalloc(CEX2A_MAX_MESSAGE_SIZE, GFP_KERNEL);
963ed931 MS	298	if (!ap_msg.message)
	299	return -ENOMEM;
	300	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
	301	atomic_inc_return(&zcrypt_step);
	302	ap_msg.private = &work;
	303	rc = ICAMEX_msg_to_type50MEX_msg(zdev, &ap_msg, mex);
	304	if (rc)
	305	goto out_free;
	306	init_completion(&work);
	307	ap_queue_message(zdev->ap_dev, &ap_msg);
af512ed0 RW	308	rc = wait_for_completion_interruptible(&work);
af512ed0 RW	309	if (rc == 0)
963ed931 MS	310	rc = convert_response(zdev, &ap_msg, mex->outputdata,
963ed931 MS	311	mex->outputdatalength);
af512ed0 RW	312	else
af512ed0 RW	313	/* Signal pending. */
963ed931	314	ap_cancel_message(zdev->ap_dev, &ap_msg);
963ed931 MS	315	out_free:
	316	kfree(ap_msg.message);
	317	return rc;
	318	}
	319
	320	/**
	321	* The request distributor calls this function if it picked the CEX2A
	322	* device to handle a modexpo_crt request.
	323	* @zdev: pointer to zcrypt_device structure that identifies the
	324	* CEX2A device to the request distributor
	325	* @crt: pointer to the modexpoc_crt request buffer
	326	*/
	327	static long zcrypt_cex2a_modexpo_crt(struct zcrypt_device *zdev,
	328	struct ica_rsa_modexpo_crt *crt)
	329	{
	330	struct ap_message ap_msg;
	331	struct completion work;
	332	int rc;
	333
5cbded58	334	ap_msg.message = kmalloc(CEX2A_MAX_MESSAGE_SIZE, GFP_KERNEL);
963ed931 MS	335	if (!ap_msg.message)
	336	return -ENOMEM;
	337	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
	338	atomic_inc_return(&zcrypt_step);
	339	ap_msg.private = &work;
	340	rc = ICACRT_msg_to_type50CRT_msg(zdev, &ap_msg, crt);
	341	if (rc)
	342	goto out_free;
	343	init_completion(&work);
	344	ap_queue_message(zdev->ap_dev, &ap_msg);
af512ed0 RW	345	rc = wait_for_completion_interruptible(&work);
af512ed0 RW	346	if (rc == 0)
963ed931 MS	347	rc = convert_response(zdev, &ap_msg, crt->outputdata,
963ed931 MS	348	crt->outputdatalength);
af512ed0 RW	349	else
af512ed0 RW	350	/* Signal pending. */
963ed931	351	ap_cancel_message(zdev->ap_dev, &ap_msg);
963ed931 MS	352	out_free:
	353	kfree(ap_msg.message);
	354	return rc;
	355	}
	356
	357	/**
	358	* The crypto operations for a CEX2A card.
	359	*/
	360	static struct zcrypt_ops zcrypt_cex2a_ops = {
	361	.rsa_modexpo = zcrypt_cex2a_modexpo,
	362	.rsa_modexpo_crt = zcrypt_cex2a_modexpo_crt,
	363	};
	364
	365	/**
	366	* Probe function for CEX2A cards. It always accepts the AP device
	367	* since the bus_match already checked the hardware type.
	368	* @ap_dev: pointer to the AP device.
	369	*/
	370	static int zcrypt_cex2a_probe(struct ap_device *ap_dev)
	371	{
	372	struct zcrypt_device *zdev;
	373	int rc;
	374
	375	zdev = zcrypt_device_alloc(CEX2A_MAX_RESPONSE_SIZE);
	376	if (!zdev)
	377	return -ENOMEM;
	378	zdev->ap_dev = ap_dev;
	379	zdev->ops = &zcrypt_cex2a_ops;
	380	zdev->online = 1;
	381	zdev->user_space_type = ZCRYPT_CEX2A;
	382	zdev->type_string = "CEX2A";
	383	zdev->min_mod_size = CEX2A_MIN_MOD_SIZE;
	384	zdev->max_mod_size = CEX2A_MAX_MOD_SIZE;
	385	zdev->short_crt = 1;
	386	zdev->speed_rating = CEX2A_SPEED_RATING;
	387	ap_dev->reply = &zdev->reply;
	388	ap_dev->private = zdev;
	389	rc = zcrypt_device_register(zdev);
	390	if (rc)
	391	goto out_free;
	392	return 0;
	393
	394	out_free:
	395	ap_dev->private = NULL;
	396	zcrypt_device_free(zdev);
	397	return rc;
	398	}
	399
	400	/**
	401	* This is called to remove the extended CEX2A driver information
	402	* if an AP device is removed.
	403	*/
	404	static void zcrypt_cex2a_remove(struct ap_device *ap_dev)
	405	{
	406	struct zcrypt_device *zdev = ap_dev->private;
	407
	408	zcrypt_device_unregister(zdev);
	409	}
	410
	411	int __init zcrypt_cex2a_init(void)
	412	{
	413	return ap_driver_register(&zcrypt_cex2a_driver, THIS_MODULE, "cex2a");
	414	}
	415
416	void __exit zcrypt_cex2a_exit(void)
417	{
418	ap_driver_unregister(&zcrypt_cex2a_driver);
419	}
420
421	#ifndef CONFIG_ZCRYPT_MONOLITHIC
422	module_init(zcrypt_cex2a_init);
423	module_exit(zcrypt_cex2a_exit);
424	#endif