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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2006-09-20 09:58:29 -0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2006-09-20 09:58:29 -0400
commit963ed931c3fd18082bfde0e8704a28955663abf4 (patch)
tree3d7fb72d8aca7b4020e8bfe0b055c71f3d7de5c7 /drivers/s390/crypto/zcrypt_pcica.c
parent2dbc2418bac32a18a372ae9aec386f0fe9174389 (diff)
[S390] zcrypt CEX2A, CEX2C, PCICA accelerator card ap bus drivers.
Signed-off-by: Ralph Wuerthner <rwuerthn@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/zcrypt_pcica.c')
-rw-r--r--drivers/s390/crypto/zcrypt_pcica.c418
1 files changed, 418 insertions, 0 deletions
diff --git a/drivers/s390/crypto/zcrypt_pcica.c b/drivers/s390/crypto/zcrypt_pcica.c
new file mode 100644
index 000000000000..0ff56e86caae
--- /dev/null
+++ b/drivers/s390/crypto/zcrypt_pcica.c
@@ -0,0 +1,418 @@
1/*
2 * linux/drivers/s390/crypto/zcrypt_pcica.c
3 *
4 * zcrypt 2.0.0
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_pcica.h"
39
40#define PCICA_MIN_MOD_SIZE 1 /* 8 bits */
41#define PCICA_MAX_MOD_SIZE 256 /* 2048 bits */
42
43#define PCICA_SPEED_RATING 2800
44
45#define PCICA_MAX_MESSAGE_SIZE 0x3a0 /* sizeof(struct type4_lcr) */
46#define PCICA_MAX_RESPONSE_SIZE 0x110 /* max outputdatalength + type80_hdr */
47
48#define PCICA_CLEANUP_TIME (15*HZ)
49
50static struct ap_device_id zcrypt_pcica_ids[] = {
51 { AP_DEVICE(AP_DEVICE_TYPE_PCICA) },
52 { /* end of list */ },
53};
54
55#ifndef CONFIG_ZCRYPT_MONOLITHIC
56MODULE_DEVICE_TABLE(ap, zcrypt_pcica_ids);
57MODULE_AUTHOR("IBM Corporation");
58MODULE_DESCRIPTION("PCICA Cryptographic Coprocessor device driver, "
59 "Copyright 2001, 2006 IBM Corporation");
60MODULE_LICENSE("GPL");
61#endif
62
63static int zcrypt_pcica_probe(struct ap_device *ap_dev);
64static void zcrypt_pcica_remove(struct ap_device *ap_dev);
65static void zcrypt_pcica_receive(struct ap_device *, struct ap_message *,
66 struct ap_message *);
67
68static struct ap_driver zcrypt_pcica_driver = {
69 .probe = zcrypt_pcica_probe,
70 .remove = zcrypt_pcica_remove,
71 .receive = zcrypt_pcica_receive,
72 .ids = zcrypt_pcica_ids,
73};
74
75/**
76 * Convert a ICAMEX message to a type4 MEX message.
77 *
78 * @zdev: crypto device pointer
79 * @zreq: crypto request pointer
80 * @mex: pointer to user input data
81 *
82 * Returns 0 on success or -EFAULT.
83 */
84static int ICAMEX_msg_to_type4MEX_msg(struct zcrypt_device *zdev,
85 struct ap_message *ap_msg,
86 struct ica_rsa_modexpo *mex)
87{
88 unsigned char *modulus, *exponent, *message;
89 int mod_len;
90
91 mod_len = mex->inputdatalength;
92
93 if (mod_len <= 128) {
94 struct type4_sme *sme = ap_msg->message;
95 memset(sme, 0, sizeof(*sme));
96 ap_msg->length = sizeof(*sme);
97 sme->header.msg_fmt = TYPE4_SME_FMT;
98 sme->header.msg_len = sizeof(*sme);
99 sme->header.msg_type_code = TYPE4_TYPE_CODE;
100 sme->header.request_code = TYPE4_REQU_CODE;
101 modulus = sme->modulus + sizeof(sme->modulus) - mod_len;
102 exponent = sme->exponent + sizeof(sme->exponent) - mod_len;
103 message = sme->message + sizeof(sme->message) - mod_len;
104 } else {
105 struct type4_lme *lme = ap_msg->message;
106 memset(lme, 0, sizeof(*lme));
107 ap_msg->length = sizeof(*lme);
108 lme->header.msg_fmt = TYPE4_LME_FMT;
109 lme->header.msg_len = sizeof(*lme);
110 lme->header.msg_type_code = TYPE4_TYPE_CODE;
111 lme->header.request_code = TYPE4_REQU_CODE;
112 modulus = lme->modulus + sizeof(lme->modulus) - mod_len;
113 exponent = lme->exponent + sizeof(lme->exponent) - mod_len;
114 message = lme->message + sizeof(lme->message) - mod_len;
115 }
116
117 if (copy_from_user(modulus, mex->n_modulus, mod_len) ||
118 copy_from_user(exponent, mex->b_key, mod_len) ||
119 copy_from_user(message, mex->inputdata, mod_len))
120 return -EFAULT;
121 return 0;
122}
123
124/**
125 * Convert a ICACRT message to a type4 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 */
133static int ICACRT_msg_to_type4CRT_msg(struct zcrypt_device *zdev,
134 struct ap_message *ap_msg,
135 struct ica_rsa_modexpo_crt *crt)
136{
137 unsigned char *p, *q, *dp, *dq, *u, *inp;
138 int mod_len, short_len, long_len;
139
140 mod_len = crt->inputdatalength;
141 short_len = mod_len / 2;
142 long_len = mod_len / 2 + 8;
143
144 if (mod_len <= 128) {
145 struct type4_scr *scr = ap_msg->message;
146 memset(scr, 0, sizeof(*scr));
147 ap_msg->length = sizeof(*scr);
148 scr->header.msg_type_code = TYPE4_TYPE_CODE;
149 scr->header.request_code = TYPE4_REQU_CODE;
150 scr->header.msg_fmt = TYPE4_SCR_FMT;
151 scr->header.msg_len = sizeof(*scr);
152 p = scr->p + sizeof(scr->p) - long_len;
153 q = scr->q + sizeof(scr->q) - short_len;
154 dp = scr->dp + sizeof(scr->dp) - long_len;
155 dq = scr->dq + sizeof(scr->dq) - short_len;
156 u = scr->u + sizeof(scr->u) - long_len;
157 inp = scr->message + sizeof(scr->message) - mod_len;
158 } else {
159 struct type4_lcr *lcr = ap_msg->message;
160 memset(lcr, 0, sizeof(*lcr));
161 ap_msg->length = sizeof(*lcr);
162 lcr->header.msg_type_code = TYPE4_TYPE_CODE;
163 lcr->header.request_code = TYPE4_REQU_CODE;
164 lcr->header.msg_fmt = TYPE4_LCR_FMT;
165 lcr->header.msg_len = sizeof(*lcr);
166 p = lcr->p + sizeof(lcr->p) - long_len;
167 q = lcr->q + sizeof(lcr->q) - short_len;
168 dp = lcr->dp + sizeof(lcr->dp) - long_len;
169 dq = lcr->dq + sizeof(lcr->dq) - short_len;
170 u = lcr->u + sizeof(lcr->u) - long_len;
171 inp = lcr->message + sizeof(lcr->message) - mod_len;
172 }
173
174 if (copy_from_user(p, crt->np_prime, long_len) ||
175 copy_from_user(q, crt->nq_prime, short_len) ||
176 copy_from_user(dp, crt->bp_key, long_len) ||
177 copy_from_user(dq, crt->bq_key, short_len) ||
178 copy_from_user(u, crt->u_mult_inv, long_len) ||
179 copy_from_user(inp, crt->inputdata, mod_len))
180 return -EFAULT;
181 return 0;
182}
183
184/**
185 * Copy results from a type 84 reply message back to user space.
186 *
187 * @zdev: crypto device pointer
188 * @reply: reply AP message.
189 * @data: pointer to user output data
190 * @length: size of user output data
191 *
192 * Returns 0 on success or -EFAULT.
193 */
194static inline int convert_type84(struct zcrypt_device *zdev,
195 struct ap_message *reply,
196 char __user *outputdata,
197 unsigned int outputdatalength)
198{
199 struct type84_hdr *t84h = reply->message;
200 char *data;
201
202 if (t84h->len < sizeof(*t84h) + outputdatalength) {
203 /* The result is too short, the PCICA card may not do that.. */
204 zdev->online = 0;
205 return -EAGAIN; /* repeat the request on a different device. */
206 }
207 BUG_ON(t84h->len > PCICA_MAX_RESPONSE_SIZE);
208 data = reply->message + t84h->len - outputdatalength;
209 if (copy_to_user(outputdata, data, outputdatalength))
210 return -EFAULT;
211 return 0;
212}
213
214static int convert_response(struct zcrypt_device *zdev,
215 struct ap_message *reply,
216 char __user *outputdata,
217 unsigned int outputdatalength)
218{
219 /* Response type byte is the second byte in the response. */
220 switch (((unsigned char *) reply->message)[1]) {
221 case TYPE82_RSP_CODE:
222 case TYPE88_RSP_CODE:
223 return convert_error(zdev, reply);
224 case TYPE84_RSP_CODE:
225 return convert_type84(zdev, reply,
226 outputdata, outputdatalength);
227 default: /* Unknown response type, this should NEVER EVER happen */
228 PRINTK("Unrecognized Message Header: %08x%08x\n",
229 *(unsigned int *) reply->message,
230 *(unsigned int *) (reply->message+4));
231 zdev->online = 0;
232 return -EAGAIN; /* repeat the request on a different device. */
233 }
234}
235
236/**
237 * This function is called from the AP bus code after a crypto request
238 * "msg" has finished with the reply message "reply".
239 * It is called from tasklet context.
240 * @ap_dev: pointer to the AP device
241 * @msg: pointer to the AP message
242 * @reply: pointer to the AP reply message
243 */
244static void zcrypt_pcica_receive(struct ap_device *ap_dev,
245 struct ap_message *msg,
246 struct ap_message *reply)
247{
248 static struct error_hdr error_reply = {
249 .type = TYPE82_RSP_CODE,
250 .reply_code = REP82_ERROR_MACHINE_FAILURE,
251 };
252 struct type84_hdr *t84h = reply->message;
253 int length;
254
255 /* Copy the reply message to the request message buffer. */
256 if (IS_ERR(reply))
257 memcpy(msg->message, &error_reply, sizeof(error_reply));
258 else if (t84h->code == TYPE84_RSP_CODE) {
259 length = min(PCICA_MAX_RESPONSE_SIZE, (int) t84h->len);
260 memcpy(msg->message, reply->message, length);
261 } else
262 memcpy(msg->message, reply->message, sizeof error_reply);
263 complete((struct completion *) msg->private);
264}
265
266static atomic_t zcrypt_step = ATOMIC_INIT(0);
267
268/**
269 * The request distributor calls this function if it picked the PCICA
270 * device to handle a modexpo request.
271 * @zdev: pointer to zcrypt_device structure that identifies the
272 * PCICA device to the request distributor
273 * @mex: pointer to the modexpo request buffer
274 */
275static long zcrypt_pcica_modexpo(struct zcrypt_device *zdev,
276 struct ica_rsa_modexpo *mex)
277{
278 struct ap_message ap_msg;
279 struct completion work;
280 int rc;
281
282 ap_msg.message = (void *) kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL);
283 if (!ap_msg.message)
284 return -ENOMEM;
285 ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
286 atomic_inc_return(&zcrypt_step);
287 ap_msg.private = &work;
288 rc = ICAMEX_msg_to_type4MEX_msg(zdev, &ap_msg, mex);
289 if (rc)
290 goto out_free;
291 init_completion(&work);
292 ap_queue_message(zdev->ap_dev, &ap_msg);
293 rc = wait_for_completion_interruptible_timeout(
294 &work, PCICA_CLEANUP_TIME);
295 if (rc > 0)
296 rc = convert_response(zdev, &ap_msg, mex->outputdata,
297 mex->outputdatalength);
298 else {
299 /* Signal pending or message timed out. */
300 ap_cancel_message(zdev->ap_dev, &ap_msg);
301 if (rc == 0)
302 /* Message timed out. */
303 rc = -ETIME;
304 }
305out_free:
306 kfree(ap_msg.message);
307 return rc;
308}
309
310/**
311 * The request distributor calls this function if it picked the PCICA
312 * device to handle a modexpo_crt request.
313 * @zdev: pointer to zcrypt_device structure that identifies the
314 * PCICA device to the request distributor
315 * @crt: pointer to the modexpoc_crt request buffer
316 */
317static long zcrypt_pcica_modexpo_crt(struct zcrypt_device *zdev,
318 struct ica_rsa_modexpo_crt *crt)
319{
320 struct ap_message ap_msg;
321 struct completion work;
322 int rc;
323
324 ap_msg.message = (void *) kmalloc(PCICA_MAX_MESSAGE_SIZE, GFP_KERNEL);
325 if (!ap_msg.message)
326 return -ENOMEM;
327 ap_msg.psmid = (((unsigned long long) current->pid) << 32) +
328 atomic_inc_return(&zcrypt_step);
329 ap_msg.private = &work;
330 rc = ICACRT_msg_to_type4CRT_msg(zdev, &ap_msg, crt);
331 if (rc)
332 goto out_free;
333 init_completion(&work);
334 ap_queue_message(zdev->ap_dev, &ap_msg);
335 rc = wait_for_completion_interruptible_timeout(
336 &work, PCICA_CLEANUP_TIME);
337 if (rc > 0)
338 rc = convert_response(zdev, &ap_msg, crt->outputdata,
339 crt->outputdatalength);
340 else {
341 /* Signal pending or message timed out. */
342 ap_cancel_message(zdev->ap_dev, &ap_msg);
343 if (rc == 0)
344 /* Message timed out. */
345 rc = -ETIME;
346 }
347out_free:
348 kfree(ap_msg.message);
349 return rc;
350}
351
352/**
353 * The crypto operations for a PCICA card.
354 */
355static struct zcrypt_ops zcrypt_pcica_ops = {
356 .rsa_modexpo = zcrypt_pcica_modexpo,
357 .rsa_modexpo_crt = zcrypt_pcica_modexpo_crt,
358};
359
360/**
361 * Probe function for PCICA cards. It always accepts the AP device
362 * since the bus_match already checked the hardware type.
363 * @ap_dev: pointer to the AP device.
364 */
365static int zcrypt_pcica_probe(struct ap_device *ap_dev)
366{
367 struct zcrypt_device *zdev;
368 int rc;
369
370 zdev = zcrypt_device_alloc(PCICA_MAX_RESPONSE_SIZE);
371 if (!zdev)
372 return -ENOMEM;
373 zdev->ap_dev = ap_dev;
374 zdev->ops = &zcrypt_pcica_ops;
375 zdev->online = 1;
376 zdev->user_space_type = ZCRYPT_PCICA;
377 zdev->type_string = "PCICA";
378 zdev->min_mod_size = PCICA_MIN_MOD_SIZE;
379 zdev->max_mod_size = PCICA_MAX_MOD_SIZE;
380 zdev->speed_rating = PCICA_SPEED_RATING;
381 ap_dev->reply = &zdev->reply;
382 ap_dev->private = zdev;
383 rc = zcrypt_device_register(zdev);
384 if (rc)
385 goto out_free;
386 return 0;
387
388out_free:
389 ap_dev->private = NULL;
390 zcrypt_device_free(zdev);
391 return rc;
392}
393
394/**
395 * This is called to remove the extended PCICA driver information
396 * if an AP device is removed.
397 */
398static void zcrypt_pcica_remove(struct ap_device *ap_dev)
399{
400 struct zcrypt_device *zdev = ap_dev->private;
401
402 zcrypt_device_unregister(zdev);
403}
404
405int __init zcrypt_pcica_init(void)
406{
407 return ap_driver_register(&zcrypt_pcica_driver, THIS_MODULE, "pcica");
408}
409
410void zcrypt_pcica_exit(void)
411{
412 ap_driver_unregister(&zcrypt_pcica_driver);
413}
414
415#ifndef CONFIG_ZCRYPT_MONOLITHIC
416module_init(zcrypt_pcica_init);
417module_exit(zcrypt_pcica_exit);
418#endif