aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/s390/crypto/zcrypt_pcicc.c
blob: d6d59bf9ac3832eb6b3f8afb03c73d8e25ae7001 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
/*
 *  linux/drivers/s390/crypto/zcrypt_pcicc.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_pcicc.h"
#include "zcrypt_cca_key.h"

#define PCICC_MIN_MOD_SIZE	 64	/*  512 bits */
#define PCICC_MAX_MOD_SIZE_OLD	128	/* 1024 bits */
#define PCICC_MAX_MOD_SIZE	256	/* 2048 bits */

/**
 * PCICC cards need a speed rating of 0. This keeps them at the end of
 * the zcrypt device list (see zcrypt_api.c). PCICC cards are only
 * used if no other cards are present because they are slow and can only
 * cope with PKCS12 padded requests. The logic is queer. PKCS11 padded
 * requests are rejected. The modexpo function encrypts PKCS12 padded data
 * and decrypts any non-PKCS12 padded data (except PKCS11) in the assumption
 * that it's encrypted PKCS12 data. The modexpo_crt function always decrypts
 * the data in the assumption that its PKCS12 encrypted data.
 */
#define PCICC_SPEED_RATING	0

#define PCICC_MAX_MESSAGE_SIZE 0x710	/* max size type6 v1 crt message */
#define PCICC_MAX_RESPONSE_SIZE 0x710	/* max size type86 v1 reply	 */

#define PCICC_CLEANUP_TIME	(15*HZ)

static struct ap_device_id zcrypt_pcicc_ids[] = {
	{ AP_DEVICE(AP_DEVICE_TYPE_PCICC) },
	{ /* end of list */ },
};

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

static int zcrypt_pcicc_probe(struct ap_device *ap_dev);
static void zcrypt_pcicc_remove(struct ap_device *ap_dev);
static void zcrypt_pcicc_receive(struct ap_device *, struct ap_message *,
				 struct ap_message *);

static struct ap_driver zcrypt_pcicc_driver = {
	.probe = zcrypt_pcicc_probe,
	.remove = zcrypt_pcicc_remove,
	.receive = zcrypt_pcicc_receive,
	.ids = zcrypt_pcicc_ids,
	.request_timeout = PCICC_CLEANUP_TIME,
};

/**
 * The following is used to initialize the CPRB passed to the PCICC card
 * in a type6 message. The 3 fields that must be filled in at execution
 * time are  req_parml, rpl_parml and usage_domain. Note that all three
 * fields are *little*-endian. Actually, everything about this interface
 * is ascii/little-endian, since the device has 'Intel inside'.
 *
 * The CPRB is followed immediately by the parm block.
 * The parm block contains:
 * - function code ('PD' 0x5044 or 'PK' 0x504B)
 * - rule block (0x0A00 'PKCS-1.2' or 0x0A00 'ZERO-PAD')
 * - VUD block
 */
static struct CPRB static_cprb = {
	.cprb_len	= __constant_cpu_to_le16(0x0070),
	.cprb_ver_id	=  0x41,
	.func_id	= {0x54,0x32},
	.checkpoint_flag=  0x01,
	.svr_namel	= __constant_cpu_to_le16(0x0008),
	.svr_name	= {'I','C','S','F',' ',' ',' ',' '}
};

/**
 * Check the message for PKCS11 padding.
 */
static inline int is_PKCS11_padded(unsigned char *buffer, int length)
{
	int i;
	if ((buffer[0] != 0x00) || (buffer[1] != 0x01))
		return 0;
	for (i = 2; i < length; i++)
		if (buffer[i] != 0xFF)
			break;
	if (i < 10 || i == length)
		return 0;
	if (buffer[i] != 0x00)
		return 0;
	return 1;
}

/**
 * Check the message for PKCS12 padding.
 */
static inline int is_PKCS12_padded(unsigned char *buffer, int length)
{
	int i;
	if ((buffer[0] != 0x00) || (buffer[1] != 0x02))
		return 0;
	for (i = 2; i < length; i++)
		if (buffer[i] == 0x00)
			break;
	if ((i < 10) || (i == length))
		return 0;
	if (buffer[i] != 0x00)
		return 0;
	return 1;
}

/**
 * Convert a ICAMEX message to a type6 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_type6MEX_msg(struct zcrypt_device *zdev,
				      struct ap_message *ap_msg,
				      struct ica_rsa_modexpo *mex)
{
	static struct type6_hdr static_type6_hdr = {
		.type		=  0x06,
		.offset1	=  0x00000058,
		.agent_id	= {0x01,0x00,0x43,0x43,0x41,0x2D,0x41,0x50,
				   0x50,0x4C,0x20,0x20,0x20,0x01,0x01,0x01},
		.function_code	= {'P','K'},
	};
	static struct function_and_rules_block static_pke_function_and_rules ={
		.function_code	= {'P','K'},
		.ulen		= __constant_cpu_to_le16(10),
		.only_rule	= {'P','K','C','S','-','1','.','2'}
	};
	struct {
		struct type6_hdr hdr;
		struct CPRB cprb;
		struct function_and_rules_block fr;
		unsigned short length;
		char text[0];
	} __attribute__((packed)) *msg = ap_msg->message;
	int vud_len, pad_len, size;

	/* VUD.ciphertext */
	if (copy_from_user(msg->text, mex->inputdata, mex->inputdatalength))
		return -EFAULT;

	if (is_PKCS11_padded(msg->text, mex->inputdatalength))
		return -EINVAL;

	/* static message header and f&r */
	msg->hdr = static_type6_hdr;
	msg->fr = static_pke_function_and_rules;

	if (is_PKCS12_padded(msg->text, mex->inputdatalength)) {
		/* strip the padding and adjust the data length */
		pad_len = strnlen(msg->text + 2, mex->inputdatalength - 2) + 3;
		if (pad_len <= 9 || pad_len >= mex->inputdatalength)
			return -ENODEV;
		vud_len = mex->inputdatalength - pad_len;
		memmove(msg->text, msg->text + pad_len, vud_len);
		msg->length = cpu_to_le16(vud_len + 2);

		/* Set up key after the variable length text. */
		size = zcrypt_type6_mex_key_en(mex, msg->text + vud_len, 0);
		if (size < 0)
			return size;
		size += sizeof(*msg) + vud_len;	/* total size of msg */
	} else {
		vud_len = mex->inputdatalength;
		msg->length = cpu_to_le16(2 + vud_len);

		msg->hdr.function_code[1] = 'D';
		msg->fr.function_code[1] = 'D';

		/* Set up key after the variable length text. */
		size = zcrypt_type6_mex_key_de(mex, msg->text + vud_len, 0);
		if (size < 0)
			return size;
		size += sizeof(*msg) + vud_len;	/* total size of msg */
	}

	/* message header, cprb and f&r */
	msg->hdr.ToCardLen1 = (size - sizeof(msg->hdr) + 3) & -4;
	msg->hdr.FromCardLen1 = PCICC_MAX_RESPONSE_SIZE - sizeof(msg->hdr);

	msg->cprb = static_cprb;
	msg->cprb.usage_domain[0]= AP_QID_QUEUE(zdev->ap_dev->qid);
	msg->cprb.req_parml = cpu_to_le16(size - sizeof(msg->hdr) -
					   sizeof(msg->cprb));
	msg->cprb.rpl_parml = cpu_to_le16(msg->hdr.FromCardLen1);

	ap_msg->length = (size + 3) & -4;
	return 0;
}

/**
 * Convert a ICACRT message to a type6 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_type6CRT_msg(struct zcrypt_device *zdev,
				      struct ap_message *ap_msg,
				      struct ica_rsa_modexpo_crt *crt)
{
	static struct type6_hdr static_type6_hdr = {
		.type		=  0x06,
		.offset1	=  0x00000058,
		.agent_id	= {0x01,0x00,0x43,0x43,0x41,0x2D,0x41,0x50,
				   0x50,0x4C,0x20,0x20,0x20,0x01,0x01,0x01},
		.function_code	= {'P','D'},
	};
	static struct function_and_rules_block static_pkd_function_and_rules ={
		.function_code	= {'P','D'},
		.ulen		= __constant_cpu_to_le16(10),
		.only_rule	= {'P','K','C','S','-','1','.','2'}
	};
	struct {
		struct type6_hdr hdr;
		struct CPRB cprb;
		struct function_and_rules_block fr;
		unsigned short length;
		char text[0];
	} __attribute__((packed)) *msg = ap_msg->message;
	int size;

	/* VUD.ciphertext */
	msg->length = cpu_to_le16(2 + crt->inputdatalength);
	if (copy_from_user(msg->text, crt->inputdata, crt->inputdatalength))
		return -EFAULT;

	if (is_PKCS11_padded(msg->text, crt->inputdatalength))
		return -EINVAL;

	/* Set up key after the variable length text. */
	size = zcrypt_type6_crt_key(crt, msg->text + crt->inputdatalength, 0);
	if (size < 0)
		return size;
	size += sizeof(*msg) + crt->inputdatalength;	/* total size of msg */

	/* message header, cprb and f&r */
	msg->hdr = static_type6_hdr;
	msg->hdr.ToCardLen1 = (size -  sizeof(msg->hdr) + 3) & -4;
	msg->hdr.FromCardLen1 = PCICC_MAX_RESPONSE_SIZE - sizeof(msg->hdr);

	msg->cprb = static_cprb;
	msg->cprb.usage_domain[0] = AP_QID_QUEUE(zdev->ap_dev->qid);
	msg->cprb.req_parml = msg->cprb.rpl_parml =
		cpu_to_le16(size - sizeof(msg->hdr) - sizeof(msg->cprb));

	msg->fr = static_pkd_function_and_rules;

	ap_msg->length = (size + 3) & -4;
	return 0;
}

/**
 * Copy results from a type 86 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 -EINVAL, -EFAULT, -EAGAIN in case of an error.
 */
struct type86_reply {
	struct type86_hdr hdr;
	struct type86_fmt2_ext fmt2;
	struct CPRB cprb;
	unsigned char pad[4];	/* 4 byte function code/rules block ? */
	unsigned short length;
	char text[0];
} __attribute__((packed));

static int convert_type86(struct zcrypt_device *zdev,
			  struct ap_message *reply,
			  char __user *outputdata,
			  unsigned int outputdatalength)
{
	static unsigned char static_pad[] = {
		0x00,0x02,
		0x1B,0x7B,0x5D,0xB5,0x75,0x01,0x3D,0xFD,
		0x8D,0xD1,0xC7,0x03,0x2D,0x09,0x23,0x57,
		0x89,0x49,0xB9,0x3F,0xBB,0x99,0x41,0x5B,
		0x75,0x21,0x7B,0x9D,0x3B,0x6B,0x51,0x39,
		0xBB,0x0D,0x35,0xB9,0x89,0x0F,0x93,0xA5,
		0x0B,0x47,0xF1,0xD3,0xBB,0xCB,0xF1,0x9D,
		0x23,0x73,0x71,0xFF,0xF3,0xF5,0x45,0xFB,
		0x61,0x29,0x23,0xFD,0xF1,0x29,0x3F,0x7F,
		0x17,0xB7,0x1B,0xA9,0x19,0xBD,0x57,0xA9,
		0xD7,0x95,0xA3,0xCB,0xED,0x1D,0xDB,0x45,
		0x7D,0x11,0xD1,0x51,0x1B,0xED,0x71,0xE9,
		0xB1,0xD1,0xAB,0xAB,0x21,0x2B,0x1B,0x9F,
		0x3B,0x9F,0xF7,0xF7,0xBD,0x63,0xEB,0xAD,
		0xDF,0xB3,0x6F,0x5B,0xDB,0x8D,0xA9,0x5D,
		0xE3,0x7D,0x77,0x49,0x47,0xF5,0xA7,0xFD,
		0xAB,0x2F,0x27,0x35,0x77,0xD3,0x49,0xC9,
		0x09,0xEB,0xB1,0xF9,0xBF,0x4B,0xCB,0x2B,
		0xEB,0xEB,0x05,0xFF,0x7D,0xC7,0x91,0x8B,
		0x09,0x83,0xB9,0xB9,0x69,0x33,0x39,0x6B,
		0x79,0x75,0x19,0xBF,0xBB,0x07,0x1D,0xBD,
		0x29,0xBF,0x39,0x95,0x93,0x1D,0x35,0xC7,
		0xC9,0x4D,0xE5,0x97,0x0B,0x43,0x9B,0xF1,
		0x16,0x93,0x03,0x1F,0xA5,0xFB,0xDB,0xF3,
		0x27,0x4F,0x27,0x61,0x05,0x1F,0xB9,0x23,
		0x2F,0xC3,0x81,0xA9,0x23,0x71,0x55,0x55,
		0xEB,0xED,0x41,0xE5,0xF3,0x11,0xF1,0x43,
		0x69,0x03,0xBD,0x0B,0x37,0x0F,0x51,0x8F,
		0x0B,0xB5,0x89,0x5B,0x67,0xA9,0xD9,0x4F,
		0x01,0xF9,0x21,0x77,0x37,0x73,0x79,0xC5,
		0x7F,0x51,0xC1,0xCF,0x97,0xA1,0x75,0xAD,
		0x35,0x9D,0xD3,0xD3,0xA7,0x9D,0x5D,0x41,
		0x6F,0x65,0x1B,0xCF,0xA9,0x87,0x91,0x09
	};
	struct type86_reply *msg = reply->message;
	unsigned short service_rc, service_rs;
	unsigned int reply_len, pad_len;
	char *data;

	service_rc = le16_to_cpu(msg->cprb.ccp_rtcode);
	if (unlikely(service_rc != 0)) {
		service_rs = le16_to_cpu(msg->cprb.ccp_rscode);
		if (service_rc == 8 && service_rs == 66) {
			PDEBUG("Bad block format on PCICC\n");
			return -EINVAL;
		}
		if (service_rc == 8 && service_rs == 65) {
			PDEBUG("Probably an even modulus on PCICC\n");
			return -EINVAL;
		}
		if (service_rc == 8 && service_rs == 770) {
			PDEBUG("Invalid key length on PCICC\n");
			zdev->max_mod_size = PCICC_MAX_MOD_SIZE_OLD;
			return -EAGAIN;
		}
		if (service_rc == 8 && service_rs == 783) {
			PDEBUG("Extended bitlengths not enabled on PCICC\n");
			zdev->max_mod_size = PCICC_MAX_MOD_SIZE_OLD;
			return -EAGAIN;
		}
		PRINTK("Unknown service rc/rs (PCICC): %d/%d\n",
		       service_rc, service_rs);
		zdev->online = 0;
		return -EAGAIN;	/* repeat the request on a different device. */
	}
	data = msg->text;
	reply_len = le16_to_cpu(msg->length) - 2;
	if (reply_len > outputdatalength)
		return -EINVAL;
	/**
	 * For all encipher requests, the length of the ciphertext (reply_len)
	 * will always equal the modulus length. For MEX decipher requests
	 * the output needs to get padded. Minimum pad size is 10.
	 *
	 * Currently, the cases where padding will be added is for:
	 * - PCIXCC_MCL2 using a CRT form token (since PKD didn't support
	 *   ZERO-PAD and CRT is only supported for PKD requests)
	 * - PCICC, always
	 */
	pad_len = outputdatalength - reply_len;
	if (pad_len > 0) {
		if (pad_len < 10)
			return -EINVAL;
		/* 'restore' padding left in the PCICC/PCIXCC card. */
		if (copy_to_user(outputdata, static_pad, pad_len - 1))
			return -EFAULT;
		if (put_user(0, outputdata + pad_len - 1))
			return -EFAULT;
	}
	/* Copy the crypto response to user space. */
	if (copy_to_user(outputdata + pad_len, data, reply_len))
		return -EFAULT;
	return 0;
}

static int convert_response(struct zcrypt_device *zdev,
			    struct ap_message *reply,
			    char __user *outputdata,
			    unsigned int outputdatalength)
{
	struct type86_reply *msg = reply->message;

	/* Response type byte is the second byte in the response. */
	switch (msg->hdr.type) {
	case TYPE82_RSP_CODE:
	case TYPE88_RSP_CODE:
		return convert_error(zdev, reply);
	case TYPE86_RSP_CODE:
		if (msg->hdr.reply_code)
			return convert_error(zdev, reply);
		if (msg->cprb.cprb_ver_id == 0x01)
			return convert_type86(zdev, reply,
					      outputdata, outputdatalength);
		/* no break, incorrect cprb version is an unknown response */
	default: /* Unknown response type, this should NEVER EVER happen */
		PRINTK("Unrecognized Message Header: %08x%08x\n",
		       *(unsigned int *) reply->message,
		       *(unsigned int *) (reply->message+4));
		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_pcicc_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 type86_reply *t86r = 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 (t86r->hdr.type == TYPE86_RSP_CODE &&
		 t86r->cprb.cprb_ver_id == 0x01) {
		length = sizeof(struct type86_reply) + t86r->length - 2;
		length = min(PCICC_MAX_RESPONSE_SIZE, length);
		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 PCICC
 * device to handle a modexpo request.
 * @zdev: pointer to zcrypt_device structure that identifies the
 *	  PCICC device to the request distributor
 * @mex: pointer to the modexpo request buffer
 */
static long zcrypt_pcicc_modexpo(struct zcrypt_device *zdev,
				 struct ica_rsa_modexpo *mex)
{
	struct ap_message ap_msg;
	struct completion work;
	int rc;

	ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
	if (!ap_msg.message)
		return -ENOMEM;
	ap_msg.length = PAGE_SIZE;
	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg.private = &work;
	rc = ICAMEX_msg_to_type6MEX_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:
	free_page((unsigned long) ap_msg.message);
	return rc;
}

/**
 * The request distributor calls this function if it picked the PCICC
 * device to handle a modexpo_crt request.
 * @zdev: pointer to zcrypt_device structure that identifies the
 *	  PCICC device to the request distributor
 * @crt: pointer to the modexpoc_crt request buffer
 */
static long zcrypt_pcicc_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 = (void *) get_zeroed_page(GFP_KERNEL);
	if (!ap_msg.message)
		return -ENOMEM;
	ap_msg.length = PAGE_SIZE;
	ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
				atomic_inc_return(&zcrypt_step);
	ap_msg.private = &work;
	rc = ICACRT_msg_to_type6CRT_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:
	free_page((unsigned long) ap_msg.message);
	return rc;
}

/**
 * The crypto operations for a PCICC card.
 */
static struct zcrypt_ops zcrypt_pcicc_ops = {
	.rsa_modexpo = zcrypt_pcicc_modexpo,
	.rsa_modexpo_crt = zcrypt_pcicc_modexpo_crt,
};

/**
 * Probe function for PCICC 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_pcicc_probe(struct ap_device *ap_dev)
{
	struct zcrypt_device *zdev;
	int rc;

	zdev = zcrypt_device_alloc(PCICC_MAX_RESPONSE_SIZE);
	if (!zdev)
		return -ENOMEM;
	zdev->ap_dev = ap_dev;
	zdev->ops = &zcrypt_pcicc_ops;
	zdev->online = 1;
	zdev->user_space_type = ZCRYPT_PCICC;
	zdev->type_string = "PCICC";
	zdev->min_mod_size = PCICC_MIN_MOD_SIZE;
	zdev->max_mod_size = PCICC_MAX_MOD_SIZE;
	zdev->speed_rating = PCICC_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 PCICC driver information
 * if an AP device is removed.
 */
static void zcrypt_pcicc_remove(struct ap_device *ap_dev)
{
	struct zcrypt_device *zdev = ap_dev->private;

	zcrypt_device_unregister(zdev);
}

int __init zcrypt_pcicc_init(void)
{
	return ap_driver_register(&zcrypt_pcicc_driver, THIS_MODULE, "pcicc");
}

void zcrypt_pcicc_exit(void)
{
	ap_driver_unregister(&zcrypt_pcicc_driver);
}

#ifndef CONFIG_ZCRYPT_MONOLITHIC
module_init(zcrypt_pcicc_init);
module_exit(zcrypt_pcicc_exit);
#endif