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vfs: fix bad hashing of dentries
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / char / tpm / tpm.c
CommitLineData
1da177e4
LT		 1/*
2 * Copyright (C) 2004 IBM Corporation
3 *
4 * Authors:
5 * Leendert van Doorn <leendert@watson.ibm.com>
6 * Dave Safford <safford@watson.ibm.com>
7 * Reiner Sailer <sailer@watson.ibm.com>
8 * Kylene Hall <kjhall@us.ibm.com>
9 *
8e81cc13 10 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
1da177e4
LT		 11 *
12 * Device driver for TCG/TCPA TPM (trusted platform module).
13 * Specifications at www.trustedcomputinggroup.org
14 *
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License as
17 * published by the Free Software Foundation, version 2 of the
18 * License.
19 *
20 * Note, the TPM chip is not interrupt driven (only polling)
21 * and can have very long timeouts (minutes!). Hence the unusual
700d8bdc 22 * calls to msleep.
1da177e4
LT		 23 *
24 */
25
1da177e4 26#include <linux/poll.h>
5a0e3ad6 27#include <linux/slab.h>
d081d470 28#include <linux/mutex.h>
1da177e4 29#include <linux/spinlock.h>
fd048866 30#include <linux/freezer.h>
d081d470 31
1da177e4 32#include "tpm.h"
e5dcd87f 33#include "tpm_eventlog.h"
1da177e4 34
9e18ee19
KJH		 35enum tpm_duration {
36 TPM_SHORT = 0,
37 TPM_MEDIUM = 1,
38 TPM_LONG = 2,
39 TPM_UNDEFINED,
40};
41
42#define TPM_MAX_ORDINAL 243
07b133e6
PH		 43#define TSC_MAX_ORDINAL 12
44#define TPM_PROTECTED_COMMAND 0x00
45#define TPM_CONNECTION_COMMAND 0x40
9e18ee19 46
9b3056cc
DT		 47/*
48 * Bug workaround - some TPM's don't flush the most
49 * recently changed pcr on suspend, so force the flush
50 * with an extend to the selected _unused_ non-volatile pcr.
51 */
52static int tpm_suspend_pcr;
53module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
54MODULE_PARM_DESC(suspend_pcr,
55 "PCR to use for dummy writes to faciltate flush on suspend.");
56
1da177e4
LT		 57static LIST_HEAD(tpm_chip_list);
58static DEFINE_SPINLOCK(driver_lock);
10685a95 59static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
1da177e4 60
9e18ee19
KJH		 61/*
62 * Array with one entry per ordinal defining the maximum amount
63 * of time the chip could take to return the result. The ordinal
64 * designation of short, medium or long is defined in a table in
65 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
66 * values of the SHORT, MEDIUM, and LONG durations are retrieved
67 * from the chip during initialization with a call to tpm_get_timeouts.
68 */
9e18ee19
KJH		 69static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
70 TPM_UNDEFINED, /* 0 */
71 TPM_UNDEFINED,
72 TPM_UNDEFINED,
73 TPM_UNDEFINED,
74 TPM_UNDEFINED,
75 TPM_UNDEFINED, /* 5 */
76 TPM_UNDEFINED,
77 TPM_UNDEFINED,
78 TPM_UNDEFINED,
79 TPM_UNDEFINED,
80 TPM_SHORT, /* 10 */
81 TPM_SHORT,
82 TPM_MEDIUM,
83 TPM_LONG,
84 TPM_LONG,
85 TPM_MEDIUM, /* 15 */
86 TPM_SHORT,
87 TPM_SHORT,
88 TPM_MEDIUM,
89 TPM_LONG,
90 TPM_SHORT, /* 20 */
91 TPM_SHORT,
92 TPM_MEDIUM,
93 TPM_MEDIUM,
94 TPM_MEDIUM,
95 TPM_SHORT, /* 25 */
96 TPM_SHORT,
97 TPM_MEDIUM,
98 TPM_SHORT,
99 TPM_SHORT,
100 TPM_MEDIUM, /* 30 */
101 TPM_LONG,
102 TPM_MEDIUM,
103 TPM_SHORT,
104 TPM_SHORT,
105 TPM_SHORT, /* 35 */
106 TPM_MEDIUM,
107 TPM_MEDIUM,
108 TPM_UNDEFINED,
109 TPM_UNDEFINED,
110 TPM_MEDIUM, /* 40 */
111 TPM_LONG,
112 TPM_MEDIUM,
113 TPM_SHORT,
114 TPM_SHORT,
115 TPM_SHORT, /* 45 */
116 TPM_SHORT,
117 TPM_SHORT,
118 TPM_SHORT,
119 TPM_LONG,
120 TPM_MEDIUM, /* 50 */
121 TPM_MEDIUM,
122 TPM_UNDEFINED,
123 TPM_UNDEFINED,
124 TPM_UNDEFINED,
125 TPM_UNDEFINED, /* 55 */
126 TPM_UNDEFINED,
127 TPM_UNDEFINED,
128 TPM_UNDEFINED,
129 TPM_UNDEFINED,
130 TPM_MEDIUM, /* 60 */
131 TPM_MEDIUM,
132 TPM_MEDIUM,
133 TPM_SHORT,
134 TPM_SHORT,
135 TPM_MEDIUM, /* 65 */
136 TPM_UNDEFINED,
137 TPM_UNDEFINED,
138 TPM_UNDEFINED,
139 TPM_UNDEFINED,
140 TPM_SHORT, /* 70 */
141 TPM_SHORT,
142 TPM_UNDEFINED,
143 TPM_UNDEFINED,
144 TPM_UNDEFINED,
145 TPM_UNDEFINED, /* 75 */
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_UNDEFINED,
149 TPM_UNDEFINED,
150 TPM_LONG, /* 80 */
151 TPM_UNDEFINED,
152 TPM_MEDIUM,
153 TPM_LONG,
154 TPM_SHORT,
155 TPM_UNDEFINED, /* 85 */
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_UNDEFINED,
159 TPM_UNDEFINED,
160 TPM_SHORT, /* 90 */
161 TPM_SHORT,
162 TPM_SHORT,
163 TPM_SHORT,
164 TPM_SHORT,
165 TPM_UNDEFINED, /* 95 */
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_UNDEFINED,
169 TPM_UNDEFINED,
170 TPM_MEDIUM, /* 100 */
171 TPM_SHORT,
172 TPM_SHORT,
173 TPM_UNDEFINED,
174 TPM_UNDEFINED,
175 TPM_UNDEFINED, /* 105 */
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_UNDEFINED,
179 TPM_UNDEFINED,
180 TPM_SHORT, /* 110 */
181 TPM_SHORT,
182 TPM_SHORT,
183 TPM_SHORT,
184 TPM_SHORT,
185 TPM_SHORT, /* 115 */
186 TPM_SHORT,
187 TPM_SHORT,
188 TPM_UNDEFINED,
189 TPM_UNDEFINED,
190 TPM_LONG, /* 120 */
191 TPM_LONG,
192 TPM_MEDIUM,
193 TPM_UNDEFINED,
194 TPM_SHORT,
195 TPM_SHORT, /* 125 */
196 TPM_SHORT,
197 TPM_LONG,
198 TPM_SHORT,
199 TPM_SHORT,
200 TPM_SHORT, /* 130 */
201 TPM_MEDIUM,
202 TPM_UNDEFINED,
203 TPM_SHORT,
204 TPM_MEDIUM,
205 TPM_UNDEFINED, /* 135 */
206 TPM_UNDEFINED,
207 TPM_UNDEFINED,
208 TPM_UNDEFINED,
209 TPM_UNDEFINED,
210 TPM_SHORT, /* 140 */
211 TPM_SHORT,
212 TPM_UNDEFINED,
213 TPM_UNDEFINED,
214 TPM_UNDEFINED,
215 TPM_UNDEFINED, /* 145 */
216 TPM_UNDEFINED,
217 TPM_UNDEFINED,
218 TPM_UNDEFINED,
219 TPM_UNDEFINED,
220 TPM_SHORT, /* 150 */
221 TPM_MEDIUM,
222 TPM_MEDIUM,
223 TPM_SHORT,
224 TPM_SHORT,
225 TPM_UNDEFINED, /* 155 */
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_UNDEFINED,
229 TPM_UNDEFINED,
230 TPM_SHORT, /* 160 */
231 TPM_SHORT,
232 TPM_SHORT,
233 TPM_SHORT,
234 TPM_UNDEFINED,
235 TPM_UNDEFINED, /* 165 */
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_UNDEFINED,
239 TPM_UNDEFINED,
240 TPM_LONG, /* 170 */
241 TPM_UNDEFINED,
242 TPM_UNDEFINED,
243 TPM_UNDEFINED,
244 TPM_UNDEFINED,
245 TPM_UNDEFINED, /* 175 */
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_UNDEFINED,
249 TPM_UNDEFINED,
250 TPM_MEDIUM, /* 180 */
251 TPM_SHORT,
252 TPM_MEDIUM,
253 TPM_MEDIUM,
254 TPM_MEDIUM,
255 TPM_MEDIUM, /* 185 */
256 TPM_SHORT,
257 TPM_UNDEFINED,
258 TPM_UNDEFINED,
259 TPM_UNDEFINED,
260 TPM_UNDEFINED, /* 190 */
261 TPM_UNDEFINED,
262 TPM_UNDEFINED,
263 TPM_UNDEFINED,
264 TPM_UNDEFINED,
265 TPM_UNDEFINED, /* 195 */
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_UNDEFINED,
269 TPM_UNDEFINED,
270 TPM_SHORT, /* 200 */
271 TPM_UNDEFINED,
272 TPM_UNDEFINED,
273 TPM_UNDEFINED,
274 TPM_SHORT,
275 TPM_SHORT, /* 205 */
276 TPM_SHORT,
277 TPM_SHORT,
278 TPM_SHORT,
279 TPM_SHORT,
280 TPM_MEDIUM, /* 210 */
281 TPM_UNDEFINED,
282 TPM_MEDIUM,
283 TPM_MEDIUM,
284 TPM_MEDIUM,
285 TPM_UNDEFINED, /* 215 */
286 TPM_MEDIUM,
287 TPM_UNDEFINED,
288 TPM_UNDEFINED,
289 TPM_SHORT,
290 TPM_SHORT, /* 220 */
291 TPM_SHORT,
292 TPM_SHORT,
293 TPM_SHORT,
294 TPM_SHORT,
295 TPM_UNDEFINED, /* 225 */
296 TPM_UNDEFINED,
297 TPM_UNDEFINED,
298 TPM_UNDEFINED,
299 TPM_UNDEFINED,
300 TPM_SHORT, /* 230 */
301 TPM_LONG,
302 TPM_MEDIUM,
303 TPM_UNDEFINED,
304 TPM_UNDEFINED,
305 TPM_UNDEFINED, /* 235 */
306 TPM_UNDEFINED,
307 TPM_UNDEFINED,
308 TPM_UNDEFINED,
309 TPM_UNDEFINED,
310 TPM_SHORT, /* 240 */
311 TPM_UNDEFINED,
312 TPM_MEDIUM,
313};
314
1da177e4
LT		 315static void user_reader_timeout(unsigned long ptr)
316{
317 struct tpm_chip *chip = (struct tpm_chip *) ptr;
318
09e12f9f
KJH		 319 schedule_work(&chip->work);
320}
321
c4028958 322static void timeout_work(struct work_struct *work)
09e12f9f 323{
c4028958 324 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
09e12f9f 325
d081d470 326 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 327 atomic_set(&chip->data_pending, 0);
328 memset(chip->data_buffer, 0, TPM_BUFSIZE);
d081d470 329 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 330}
331
9e18ee19
KJH		 332/*
333 * Returns max number of jiffies to wait
334 */
335unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
336 u32 ordinal)
337{
338 int duration_idx = TPM_UNDEFINED;
339 int duration = 0;
07b133e6 340 u8 category = (ordinal >> 24) & 0xFF;
9e18ee19 341
07b133e6
PH		 342 if ((category == TPM_PROTECTED_COMMAND && ordinal < TPM_MAX_ORDINAL) ||
343 (category == TPM_CONNECTION_COMMAND && ordinal < TSC_MAX_ORDINAL))
9e18ee19 344 duration_idx = tpm_ordinal_duration[ordinal];
9e18ee19 345
8d1dc20e 346 if (duration_idx != TPM_UNDEFINED)
36b20020 347 duration = chip->vendor.duration[duration_idx];
8d1dc20e 348 if (duration <= 0)
9e18ee19 349 return 2 * 60 * HZ;
8d1dc20e
LT		 350 else
351 return duration;
9e18ee19
KJH		 352}
353EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
354
1da177e4
LT		 355/*
356 * Internal kernel interface to transmit TPM commands
357 */
358static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
359 size_t bufsiz)
360{
d9e5b6bf 361 ssize_t rc;
9e18ee19 362 u32 count, ordinal;
700d8bdc 363 unsigned long stop;
1da177e4 364
6b07d30a
PH		 365 if (bufsiz > TPM_BUFSIZE)
366 bufsiz = TPM_BUFSIZE;
367
81179bb6 368 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 369 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 370 if (count == 0)
371 return -ENODATA;
372 if (count > bufsiz) {
e659a3fe 373 dev_err(chip->dev,
b76be681 374 "invalid count value %x %zx \n", count, bufsiz);
1da177e4
LT		 375 return -E2BIG;
376 }
377
d081d470 378 mutex_lock(&chip->tpm_mutex);
1da177e4 379
90dda520 380 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
e659a3fe 381 dev_err(chip->dev,
d9e5b6bf
KH		 382 "tpm_transmit: tpm_send: error %zd\n", rc);
383 goto out;
1da177e4
LT		 384 }
385
27084efe
LD		 386 if (chip->vendor.irq)
387 goto out_recv;
388
9e18ee19 389 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 390 do {
90dda520
KJH		 391 u8 status = chip->vendor.status(chip);
392 if ((status & chip->vendor.req_complete_mask) ==
393 chip->vendor.req_complete_val)
1da177e4 394 goto out_recv;
d9e5b6bf 395
1f866057 396 if (chip->vendor.req_canceled(chip, status)) {
e659a3fe 397 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 398 rc = -ECANCELED;
399 goto out;
400 }
401
402 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 403 rmb();
700d8bdc 404 } while (time_before(jiffies, stop));
1da177e4 405
90dda520 406 chip->vendor.cancel(chip);
e659a3fe 407 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 408 rc = -ETIME;
409 goto out;
1da177e4
LT		 410
411out_recv:
90dda520 412 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 413 if (rc < 0)
e659a3fe 414 dev_err(chip->dev,
d9e5b6bf
KH		 415 "tpm_transmit: tpm_recv: error %zd\n", rc);
416out:
d081d470 417 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 418 return rc;
1da177e4
LT		 419}
420
421#define TPM_DIGEST_SIZE 20
beed53a1 422#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 423
424enum tpm_capabilities {
08837438
RA		 425 TPM_CAP_FLAG = cpu_to_be32(4),
426 TPM_CAP_PROP = cpu_to_be32(5),
427 CAP_VERSION_1_1 = cpu_to_be32(0x06),
428 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 429};
430
431enum tpm_sub_capabilities {
08837438
RA		 432 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
433 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
434 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
435 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
436 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
437 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
438 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 439
1da177e4
LT		 440};
441
08837438
RA		 442static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
443 int len, const char *desc)
beed53a1
KJH		 444{
445 int err;
446
08837438 447 len = tpm_transmit(chip,(u8 *) cmd, len);
beed53a1
KJH		 448 if (len < 0)
449 return len;
b9e3238a
RA		 450 else if (len < TPM_HEADER_SIZE)
451 return -EFAULT;
452
453 err = be32_to_cpu(cmd->header.out.return_code);
c584af19 454 if (err != 0 && desc)
b9e3238a
RA		 455 dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
456
457 return err;
beed53a1
KJH		 458}
459
08837438
RA		 460#define TPM_INTERNAL_RESULT_SIZE 200
461#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
462#define TPM_ORD_GET_CAP cpu_to_be32(101)
41ab999c 463#define TPM_ORD_GET_RANDOM cpu_to_be32(70)
08837438
RA		 464
465static const struct tpm_input_header tpm_getcap_header = {
466 .tag = TPM_TAG_RQU_COMMAND,
467 .length = cpu_to_be32(22),
468 .ordinal = TPM_ORD_GET_CAP
469};
470
471ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
472 const char *desc)
473{
474 struct tpm_cmd_t tpm_cmd;
475 int rc;
476 struct tpm_chip *chip = dev_get_drvdata(dev);
477
478 tpm_cmd.header.in = tpm_getcap_header;
479 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
480 tpm_cmd.params.getcap_in.cap = subcap_id;
481 /*subcap field not necessary */
482 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
483 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
484 } else {
485 if (subcap_id == TPM_CAP_FLAG_PERM ||
486 subcap_id == TPM_CAP_FLAG_VOL)
487 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
488 else
489 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
490 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
491 tpm_cmd.params.getcap_in.subcap = subcap_id;
492 }
493 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
494 if (!rc)
495 *cap = tpm_cmd.params.getcap_out.cap;
496 return rc;
497}
498
08e96e48
KJH		 499void tpm_gen_interrupt(struct tpm_chip *chip)
500{
08837438 501 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 502 ssize_t rc;
503
08837438
RA		 504 tpm_cmd.header.in = tpm_getcap_header;
505 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
506 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
507 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 508
08837438 509 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 510 "attempting to determine the timeouts");
511}
512EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
513
c584af19
JG		 514#define TPM_ORD_STARTUP cpu_to_be32(153)
515#define TPM_ST_CLEAR cpu_to_be16(1)
516#define TPM_ST_STATE cpu_to_be16(2)
517#define TPM_ST_DEACTIVATED cpu_to_be16(3)
518static const struct tpm_input_header tpm_startup_header = {
519 .tag = TPM_TAG_RQU_COMMAND,
520 .length = cpu_to_be32(12),
521 .ordinal = TPM_ORD_STARTUP
522};
523
524static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
525{
526 struct tpm_cmd_t start_cmd;
527 start_cmd.header.in = tpm_startup_header;
528 start_cmd.params.startup_in.startup_type = startup_type;
529 return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
530 "attempting to start the TPM");
531}
532
2b30a90f 533int tpm_get_timeouts(struct tpm_chip *chip)
08e96e48 534{
08837438
RA		 535 struct tpm_cmd_t tpm_cmd;
536 struct timeout_t *timeout_cap;
537 struct duration_t *duration_cap;
08e96e48
KJH		 538 ssize_t rc;
539 u32 timeout;
e3e1a1e1 540 unsigned int scale = 1;
08e96e48 541
08837438
RA		 542 tpm_cmd.header.in = tpm_getcap_header;
543 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
544 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
545 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
c584af19 546 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
08e96e48 547
c584af19
JG		 548 if (rc == TPM_ERR_INVALID_POSTINIT) {
549 /* The TPM is not started, we are the first to talk to it.
550 Execute a startup command. */
551 dev_info(chip->dev, "Issuing TPM_STARTUP");
552 if (tpm_startup(chip, TPM_ST_CLEAR))
553 return rc;
554
555 tpm_cmd.header.in = tpm_getcap_header;
556 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
557 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
558 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
559 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
560 NULL);
561 }
562 if (rc) {
563 dev_err(chip->dev,
564 "A TPM error (%zd) occurred attempting to determine the timeouts\n",
565 rc);
08e96e48 566 goto duration;
c584af19 567 }
08e96e48 568
829bf067
SB		 569 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
570 be32_to_cpu(tpm_cmd.header.out.length)
571 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
2b30a90f 572 return -EINVAL;
08e96e48 573
08837438 574 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 575 /* Don't overwrite default if value is 0 */
08837438 576 timeout = be32_to_cpu(timeout_cap->a);
e3e1a1e1
SB		 577 if (timeout && timeout < 1000) {
578 /* timeouts in msec rather usec */
579 scale = 1000;
62592101 580 chip->vendor.timeout_adjusted = true;
e3e1a1e1 581 }
08e96e48 582 if (timeout)
e3e1a1e1 583 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
08837438 584 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 585 if (timeout)
e3e1a1e1 586 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
08837438 587 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 588 if (timeout)
e3e1a1e1 589 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
08837438 590 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 591 if (timeout)
e3e1a1e1 592 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
08e96e48
KJH		 593
594duration:
08837438
RA		 595 tpm_cmd.header.in = tpm_getcap_header;
596 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
597 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
598 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 599
08837438 600 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 601 "attempting to determine the durations");
602 if (rc)
2b30a90f 603 return rc;
08e96e48 604
979b1406
SB		 605 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
606 be32_to_cpu(tpm_cmd.header.out.length)
607 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
2b30a90f 608 return -EINVAL;
979b1406 609
08837438 610 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 611 chip->vendor.duration[TPM_SHORT] =
08837438 612 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 613 chip->vendor.duration[TPM_MEDIUM] =
614 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
615 chip->vendor.duration[TPM_LONG] =
616 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
617
292cf4a8
VK		 618 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
619 * value wrong and apparently reports msecs rather than usecs. So we
620 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 621 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 622 */
e934acca 623 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 624 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 625 chip->vendor.duration[TPM_MEDIUM] *= 1000;
626 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 627 chip->vendor.duration_adjusted = true;
e934acca
SB		 628 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
629 }
2b30a90f 630 return 0;
08e96e48
KJH		 631}
632EXPORT_SYMBOL_GPL(tpm_get_timeouts);
633
d97c6ade
SB		 634#define TPM_ORD_CONTINUE_SELFTEST 83
635#define CONTINUE_SELFTEST_RESULT_SIZE 10
636
637static struct tpm_input_header continue_selftest_header = {
638 .tag = TPM_TAG_RQU_COMMAND,
639 .length = cpu_to_be32(10),
640 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
641};
642
643/**
644 * tpm_continue_selftest -- run TPM's selftest
645 * @chip: TPM chip to use
646 *
647 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
648 * a TPM error code.
649 */
68d6e671 650static int tpm_continue_selftest(struct tpm_chip *chip)
08e96e48 651{
d97c6ade
SB		 652 int rc;
653 struct tpm_cmd_t cmd;
08e96e48 654
d97c6ade
SB		 655 cmd.header.in = continue_selftest_header;
656 rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
657 "continue selftest");
658 return rc;
08e96e48 659}
08e96e48
KJH		 660
661ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
662 char *buf)
663{
08837438 664 cap_t cap;
08e96e48
KJH		 665 ssize_t rc;
666
08837438
RA		 667 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
668 "attempting to determine the permanent enabled state");
669 if (rc)
08e96e48 670 return 0;
ec288bd3 671
08837438 672 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 673 return rc;
08e96e48
KJH		 674}
675EXPORT_SYMBOL_GPL(tpm_show_enabled);
676
677ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
678 char *buf)
679{
08837438 680 cap_t cap;
08e96e48
KJH		 681 ssize_t rc;
682
08837438
RA		 683 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
684 "attempting to determine the permanent active state");
685 if (rc)
08e96e48 686 return 0;
ec288bd3 687
08837438 688 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 689 return rc;
08e96e48
KJH		 690}
691EXPORT_SYMBOL_GPL(tpm_show_active);
692
693ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
694 char *buf)
695{
08837438 696 cap_t cap;
08e96e48
KJH		 697 ssize_t rc;
698
08837438
RA		 699 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
700 "attempting to determine the owner state");
701 if (rc)
08e96e48 702 return 0;
ec288bd3 703
08837438 704 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 705 return rc;
08e96e48
KJH		 706}
707EXPORT_SYMBOL_GPL(tpm_show_owned);
708
709ssize_t tpm_show_temp_deactivated(struct device * dev,
710 struct device_attribute * attr, char *buf)
711{
08837438 712 cap_t cap;
08e96e48
KJH		 713 ssize_t rc;
714
08837438
RA		 715 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
716 "attempting to determine the temporary state");
717 if (rc)
08e96e48 718 return 0;
ec288bd3 719
08837438 720 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 721 return rc;
08e96e48
KJH		 722}
723EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
724
659aaf2b
RA		 725/*
726 * tpm_chip_find_get - return tpm_chip for given chip number
727 */
728static struct tpm_chip *tpm_chip_find_get(int chip_num)
729{
8920d5ad 730 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 731
732 rcu_read_lock();
733 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
734 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
735 continue;
736
8920d5ad
RA		 737 if (try_module_get(pos->dev->driver->owner)) {
738 chip = pos;
659aaf2b 739 break;
8920d5ad 740 }
659aaf2b
RA		 741 }
742 rcu_read_unlock();
8920d5ad 743 return chip;
659aaf2b
RA		 744}
745
746#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
747#define READ_PCR_RESULT_SIZE 30
748static struct tpm_input_header pcrread_header = {
749 .tag = TPM_TAG_RQU_COMMAND,
750 .length = cpu_to_be32(14),
751 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 752};
753
68d6e671 754static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
659aaf2b
RA		 755{
756 int rc;
757 struct tpm_cmd_t cmd;
758
759 cmd.header.in = pcrread_header;
760 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 761 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 762 "attempting to read a pcr value");
763
764 if (rc == 0)
765 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
766 TPM_DIGEST_SIZE);
767 return rc;
768}
769
770/**
771 * tpm_pcr_read - read a pcr value
772 * @chip_num: tpm idx # or ANY
773 * @pcr_idx: pcr idx to retrieve
774 * @res_buf: TPM_PCR value
775 * size of res_buf is 20 bytes (or NULL if you don't care)
776 *
777 * The TPM driver should be built-in, but for whatever reason it
778 * isn't, protect against the chip disappearing, by incrementing
779 * the module usage count.
780 */
781int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
782{
783 struct tpm_chip *chip;
784 int rc;
785
786 chip = tpm_chip_find_get(chip_num);
787 if (chip == NULL)
788 return -ENODEV;
789 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 790 tpm_chip_put(chip);
659aaf2b
RA		 791 return rc;
792}
793EXPORT_SYMBOL_GPL(tpm_pcr_read);
794
795/**
796 * tpm_pcr_extend - extend pcr value with hash
797 * @chip_num: tpm idx # or AN&
798 * @pcr_idx: pcr idx to extend
799 * @hash: hash value used to extend pcr value
800 *
801 * The TPM driver should be built-in, but for whatever reason it
802 * isn't, protect against the chip disappearing, by incrementing
803 * the module usage count.
804 */
805#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 806#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 807static struct tpm_input_header pcrextend_header = {
808 .tag = TPM_TAG_RQU_COMMAND,
809 .length = cpu_to_be32(34),
810 .ordinal = TPM_ORD_PCR_EXTEND
811};
812
813int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
814{
815 struct tpm_cmd_t cmd;
816 int rc;
817 struct tpm_chip *chip;
818
819 chip = tpm_chip_find_get(chip_num);
820 if (chip == NULL)
821 return -ENODEV;
822
823 cmd.header.in = pcrextend_header;
659aaf2b
RA		 824 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
825 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 826 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 827 "attempting extend a PCR value");
828
a0e39349 829 tpm_chip_put(chip);
659aaf2b
RA		 830 return rc;
831}
832EXPORT_SYMBOL_GPL(tpm_pcr_extend);
833
68d6e671
SB		 834/**
835 * tpm_do_selftest - have the TPM continue its selftest and wait until it
836 * can receive further commands
837 * @chip: TPM chip to use
838 *
839 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
840 * a TPM error code.
841 */
842int tpm_do_selftest(struct tpm_chip *chip)
843{
844 int rc;
68d6e671 845 unsigned int loops;
4643826a 846 unsigned int delay_msec = 100;
68d6e671 847 unsigned long duration;
24ebe667 848 struct tpm_cmd_t cmd;
68d6e671
SB		 849
850 duration = tpm_calc_ordinal_duration(chip,
851 TPM_ORD_CONTINUE_SELFTEST);
852
853 loops = jiffies_to_msecs(duration) / delay_msec;
854
855 rc = tpm_continue_selftest(chip);
856 /* This may fail if there was no TPM driver during a suspend/resume
857 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
858 */
859 if (rc)
860 return rc;
861
862 do {
24ebe667
RA		 863 /* Attempt to read a PCR value */
864 cmd.header.in = pcrread_header;
865 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
866 rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
4643826a
JG		 867 /* Some buggy TPMs will not respond to tpm_tis_ready() for
868 * around 300ms while the self test is ongoing, keep trying
869 * until the self test duration expires. */
870 if (rc == -ETIME) {
871 dev_info(chip->dev, HW_ERR "TPM command timed out during continue self test");
872 msleep(delay_msec);
873 continue;
874 }
24ebe667
RA		 875
876 if (rc < TPM_HEADER_SIZE)
877 return -EFAULT;
878
879 rc = be32_to_cpu(cmd.header.out.return_code);
be405411
SB		 880 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
881 dev_info(chip->dev,
882 "TPM is disabled/deactivated (0x%X)\n", rc);
883 /* TPM is disabled and/or deactivated; driver can
884 * proceed and TPM does handle commands for
885 * suspend/resume correctly
886 */
887 return 0;
888 }
68d6e671
SB		 889 if (rc != TPM_WARN_DOING_SELFTEST)
890 return rc;
891 msleep(delay_msec);
892 } while (--loops > 0);
893
894 return rc;
895}
896EXPORT_SYMBOL_GPL(tpm_do_selftest);
897
c749ba91
MZ		 898int tpm_send(u32 chip_num, void *cmd, size_t buflen)
899{
900 struct tpm_chip *chip;
901 int rc;
902
903 chip = tpm_chip_find_get(chip_num);
904 if (chip == NULL)
905 return -ENODEV;
906
907 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
908
909 tpm_chip_put(chip);
910 return rc;
911}
912EXPORT_SYMBOL_GPL(tpm_send);
913
6659ca2a
KH		 914ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
915 char *buf)
1da177e4 916{
08837438 917 cap_t cap;
659aaf2b 918 u8 digest[TPM_DIGEST_SIZE];
beed53a1 919 ssize_t rc;
81179bb6 920 int i, j, num_pcrs;
1da177e4 921 char *str = buf;
e659a3fe 922 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 923
08837438 924 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 925 "attempting to determine the number of PCRS");
08837438 926 if (rc)
e234bc97 927 return 0;
1da177e4 928
08837438 929 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 930 for (i = 0; i < num_pcrs; i++) {
659aaf2b 931 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 932 if (rc)
08837438 933 break;
1da177e4
LT		 934 str += sprintf(str, "PCR-%02d: ", i);
935 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 936 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 937 str += sprintf(str, "\n");
938 }
939 return str - buf;
940}
6659ca2a 941EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 942
943#define READ_PUBEK_RESULT_SIZE 314
08837438 944#define TPM_ORD_READPUBEK cpu_to_be32(124)
81198078 945static struct tpm_input_header tpm_readpubek_header = {
08837438
RA		 946 .tag = TPM_TAG_RQU_COMMAND,
947 .length = cpu_to_be32(30),
948 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 949};
950
6659ca2a
KH		 951ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
952 char *buf)
1da177e4 953{
2df7111f 954 u8 *data;
08837438 955 struct tpm_cmd_t tpm_cmd;
beed53a1 956 ssize_t err;
81179bb6 957 int i, rc;
1da177e4
LT		 958 char *str = buf;
959
e659a3fe 960 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 961
08837438
RA		 962 tpm_cmd.header.in = tpm_readpubek_header;
963 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 964 "attempting to read the PUBEK");
965 if (err)
34d6e075 966 goto out;
1da177e4
LT		 967
968 /*
969 ignore header 10 bytes
970 algorithm 32 bits (1 == RSA )
971 encscheme 16 bits
972 sigscheme 16 bits
973 parameters (RSA 12->bytes: keybit, #primes, expbit)
974 keylenbytes 32 bits
975 256 byte modulus
976 ignore checksum 20 bytes
977 */
08837438 978 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 979 str +=
980 sprintf(str,
5a79444f
SB		 981 "Algorithm: %02X %02X %02X %02X\n"
982 "Encscheme: %02X %02X\n"
983 "Sigscheme: %02X %02X\n"
984 "Parameters: %02X %02X %02X %02X "
985 "%02X %02X %02X %02X "
986 "%02X %02X %02X %02X\n"
987 "Modulus length: %d\n"
988 "Modulus:\n",
989 data[0], data[1], data[2], data[3],
990 data[4], data[5],
991 data[6], data[7],
992 data[12], data[13], data[14], data[15],
993 data[16], data[17], data[18], data[19],
994 data[20], data[21], data[22], data[23],
995 be32_to_cpu(*((__be32 *) (data + 24))));
1da177e4
LT		 996
997 for (i = 0; i < 256; i++) {
5a79444f 998 str += sprintf(str, "%02X ", data[i + 28]);
1da177e4
LT		 999 if ((i + 1) % 16 == 0)
1000 str += sprintf(str, "\n");
1001 }
34d6e075 1002out:
beed53a1 1003 rc = str - buf;
2df7111f 1004 return rc;
1da177e4 1005}
6659ca2a 1006EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 1007
1da177e4 1008
6659ca2a
KH		 1009ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
1010 char *buf)
1da177e4 1011{
08837438 1012 cap_t cap;
beed53a1 1013 ssize_t rc;
1da177e4
LT		 1014 char *str = buf;
1015
08837438 1016 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 1017 "attempting to determine the manufacturer");
08837438 1018 if (rc)
beed53a1 1019 return 0;
1da177e4 1020 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 1021 be32_to_cpu(cap.manufacturer_id));
1da177e4 1022
08837438
RA		 1023 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
1024 "attempting to determine the 1.1 version");
beed53a1 1025 if (rc)
08837438 1026 return 0;
beed53a1
KJH		 1027 str += sprintf(str,
1028 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 1029 cap.tpm_version.Major, cap.tpm_version.Minor,
1030 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
1da177e4
LT		 1031 return str - buf;
1032}
6659ca2a
KH		 1033EXPORT_SYMBOL_GPL(tpm_show_caps);
1034
08e96e48
KJH		 1035ssize_t tpm_show_caps_1_2(struct device * dev,
1036 struct device_attribute * attr, char *buf)
1037{
08837438
RA		 1038 cap_t cap;
1039 ssize_t rc;
08e96e48
KJH		 1040 char *str = buf;
1041
08837438
RA		 1042 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
1043 "attempting to determine the manufacturer");
1044 if (rc)
08e96e48 1045 return 0;
08e96e48 1046 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438
RA		 1047 be32_to_cpu(cap.manufacturer_id));
1048 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
1049 "attempting to determine the 1.2 version");
1050 if (rc)
1051 return 0;
08e96e48
KJH		 1052 str += sprintf(str,
1053 "TCG version: %d.%d\nFirmware version: %d.%d\n",
08837438
RA		 1054 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
1055 cap.tpm_version_1_2.revMajor,
1056 cap.tpm_version_1_2.revMinor);
08e96e48
KJH		 1057 return str - buf;
1058}
1059EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
1060
04ab2293
SB		 1061ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
1062 char *buf)
1063{
1064 struct tpm_chip *chip = dev_get_drvdata(dev);
1065
403d1d03
SB		 1066 if (chip->vendor.duration[TPM_LONG] == 0)
1067 return 0;
1068
04ab2293
SB		 1069 return sprintf(buf, "%d %d %d [%s]\n",
1070 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
1071 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
1072 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
1073 chip->vendor.duration_adjusted
1074 ? "adjusted" : "original");
1075}
1076EXPORT_SYMBOL_GPL(tpm_show_durations);
1077
62592101
SB		 1078ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1079 char *buf)
1080{
1081 struct tpm_chip *chip = dev_get_drvdata(dev);
1082
1083 return sprintf(buf, "%d %d %d %d [%s]\n",
1084 jiffies_to_usecs(chip->vendor.timeout_a),
1085 jiffies_to_usecs(chip->vendor.timeout_b),
1086 jiffies_to_usecs(chip->vendor.timeout_c),
1087 jiffies_to_usecs(chip->vendor.timeout_d),
1088 chip->vendor.timeout_adjusted
1089 ? "adjusted" : "original");
1090}
1091EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1092
6659ca2a
KH		 1093ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1094 const char *buf, size_t count)
1095{
1096 struct tpm_chip *chip = dev_get_drvdata(dev);
1097 if (chip == NULL)
1098 return 0;
1099
90dda520 1100 chip->vendor.cancel(chip);
6659ca2a
KH		 1101 return count;
1102}
1103EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 1104
78f09cc2
SB		 1105static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask, bool check_cancel,
1106 bool *canceled)
1107{
1108 u8 status = chip->vendor.status(chip);
1109
1110 *canceled = false;
1111 if ((status & mask) == mask)
1112 return true;
1113 if (check_cancel && chip->vendor.req_canceled(chip, status)) {
1114 *canceled = true;
1115 return true;
1116 }
1117 return false;
1118}
1119
fd048866 1120int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
78f09cc2 1121 wait_queue_head_t *queue, bool check_cancel)
fd048866
RA		 1122{
1123 unsigned long stop;
1124 long rc;
1125 u8 status;
78f09cc2 1126 bool canceled = false;
fd048866
RA		 1127
1128 /* check current status */
1129 status = chip->vendor.status(chip);
1130 if ((status & mask) == mask)
1131 return 0;
1132
1133 stop = jiffies + timeout;
1134
1135 if (chip->vendor.irq) {
1136again:
1137 timeout = stop - jiffies;
1138 if ((long)timeout <= 0)
1139 return -ETIME;
1140 rc = wait_event_interruptible_timeout(*queue,
78f09cc2
SB		 1141 wait_for_tpm_stat_cond(chip, mask, check_cancel,
1142 &canceled),
1143 timeout);
1144 if (rc > 0) {
1145 if (canceled)
1146 return -ECANCELED;
fd048866 1147 return 0;
78f09cc2 1148 }
fd048866
RA		 1149 if (rc == -ERESTARTSYS && freezing(current)) {
1150 clear_thread_flag(TIF_SIGPENDING);
1151 goto again;
1152 }
1153 } else {
1154 do {
1155 msleep(TPM_TIMEOUT);
1156 status = chip->vendor.status(chip);
1157 if ((status & mask) == mask)
1158 return 0;
1159 } while (time_before(jiffies, stop));
1160 }
1161 return -ETIME;
1162}
1163EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
1da177e4
LT		 1164/*
1165 * Device file system interface to the TPM
f89c5edb
RA		 1166 *
1167 * It's assured that the chip will be opened just once,
1168 * by the check of is_open variable, which is protected
1169 * by driver_lock.
1da177e4
LT		 1170 */
1171int tpm_open(struct inode *inode, struct file *file)
1172{
f02a9364 1173 int minor = iminor(inode);
1da177e4
LT		 1174 struct tpm_chip *chip = NULL, *pos;
1175
f02a9364
RA		 1176 rcu_read_lock();
1177 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
90dda520 1178 if (pos->vendor.miscdev.minor == minor) {
1da177e4 1179 chip = pos;
f02a9364 1180 get_device(chip->dev);
1da177e4
LT		 1181 break;
1182 }
1183 }
f02a9364 1184 rcu_read_unlock();
1da177e4 1185
f02a9364
RA		 1186 if (!chip)
1187 return -ENODEV;
1da177e4 1188
dc36d32c 1189 if (test_and_set_bit(0, &chip->is_open)) {
b888c87b 1190 dev_dbg(chip->dev, "Another process owns this TPM\n");
f02a9364
RA		 1191 put_device(chip->dev);
1192 return -EBUSY;
1da177e4
LT		 1193 }
1194
1309d7af 1195 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
1da177e4 1196 if (chip->data_buffer == NULL) {
dc36d32c 1197 clear_bit(0, &chip->is_open);
e659a3fe 1198 put_device(chip->dev);
1da177e4
LT		 1199 return -ENOMEM;
1200 }
1201
1202 atomic_set(&chip->data_pending, 0);
1203
1204 file->private_data = chip;
1205 return 0;
1da177e4 1206}
1da177e4
LT		 1207EXPORT_SYMBOL_GPL(tpm_open);
1208
f02a9364
RA		 1209/*
1210 * Called on file close
1211 */
1da177e4
LT		 1212int tpm_release(struct inode *inode, struct file *file)
1213{
1214 struct tpm_chip *chip = file->private_data;
1da177e4 1215
4bdec11f 1216 del_singleshot_timer_sync(&chip->user_read_timer);
43829731 1217 flush_work(&chip->work);
5e976d55 1218 file->private_data = NULL;
1da177e4 1219 atomic_set(&chip->data_pending, 0);
dd7da132 1220 kzfree(chip->data_buffer);
dc36d32c 1221 clear_bit(0, &chip->is_open);
e659a3fe 1222 put_device(chip->dev);
1da177e4
LT		 1223 return 0;
1224}
1da177e4
LT		 1225EXPORT_SYMBOL_GPL(tpm_release);
1226
b888c87b 1227ssize_t tpm_write(struct file *file, const char __user *buf,
3c2f606a 1228 size_t size, loff_t *off)
1da177e4
LT		 1229{
1230 struct tpm_chip *chip = file->private_data;
abce9ac2
PH		 1231 size_t in_size = size;
1232 ssize_t out_size;
1da177e4
LT		 1233
1234 /* cannot perform a write until the read has cleared
abce9ac2
PH		 1235 either via tpm_read or a user_read_timer timeout.
1236 This also prevents splitted buffered writes from blocking here.
1237 */
1238 if (atomic_read(&chip->data_pending) != 0)
1239 return -EBUSY;
1da177e4
LT		 1240
1241 if (in_size > TPM_BUFSIZE)
abce9ac2
PH		 1242 return -E2BIG;
1243
1244 mutex_lock(&chip->buffer_mutex);
1da177e4
LT		 1245
1246 if (copy_from_user
1247 (chip->data_buffer, (void __user *) buf, in_size)) {
d081d470 1248 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1249 return -EFAULT;
1250 }
1251
1252 /* atomic tpm command send and result receive */
1253 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
abce9ac2
PH		 1254 if (out_size < 0) {
1255 mutex_unlock(&chip->buffer_mutex);
1256 return out_size;
1257 }
1da177e4
LT		 1258
1259 atomic_set(&chip->data_pending, out_size);
d081d470 1260 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1261
1262 /* Set a timeout by which the reader must come claim the result */
fe3fd483 1263 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1da177e4
LT		 1264
1265 return in_size;
1266}
1da177e4
LT		 1267EXPORT_SYMBOL_GPL(tpm_write);
1268
3c2f606a
KJH		 1269ssize_t tpm_read(struct file *file, char __user *buf,
1270 size_t size, loff_t *off)
1da177e4
LT		 1271{
1272 struct tpm_chip *chip = file->private_data;
01476001 1273 ssize_t ret_size;
3321c07a 1274 int rc;
1da177e4 1275
5b44bd58 1276 del_singleshot_timer_sync(&chip->user_read_timer);
43829731 1277 flush_work(&chip->work);
5b44bd58 1278 ret_size = atomic_read(&chip->data_pending);
5b44bd58 1279 if (ret_size > 0) { /* relay data */
3ab1aff8 1280 ssize_t orig_ret_size = ret_size;
5b44bd58
KH		 1281 if (size < ret_size)
1282 ret_size = size;
1da177e4 1283
d081d470 1284 mutex_lock(&chip->buffer_mutex);
3321c07a 1285 rc = copy_to_user(buf, chip->data_buffer, ret_size);
3ab1aff8 1286 memset(chip->data_buffer, 0, orig_ret_size);
3321c07a 1287 if (rc)
5b44bd58 1288 ret_size = -EFAULT;
3321c07a 1289
d081d470 1290 mutex_unlock(&chip->buffer_mutex);
1da177e4
LT		 1291 }
1292
dd7da132
KY		 1293 atomic_set(&chip->data_pending, 0);
1294
1da177e4
LT		 1295 return ret_size;
1296}
1da177e4
LT		 1297EXPORT_SYMBOL_GPL(tpm_read);
1298
e659a3fe 1299void tpm_remove_hardware(struct device *dev)
1da177e4 1300{
e659a3fe 1301 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1302
1303 if (chip == NULL) {
e659a3fe 1304 dev_err(dev, "No device data found\n");
1da177e4
LT		 1305 return;
1306 }
1307
1308 spin_lock(&driver_lock);
f02a9364 1309 list_del_rcu(&chip->list);
1da177e4 1310 spin_unlock(&driver_lock);
f02a9364 1311 synchronize_rcu();
1da177e4 1312
90dda520 1313 misc_deregister(&chip->vendor.miscdev);
90dda520 1314 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1631cfb7 1315 tpm_remove_ppi(&dev->kobj);
55a82ab3 1316 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1317
5bd91f18
RM		 1318 /* write it this way to be explicit (chip->dev == dev) */
1319 put_device(chip->dev);
1da177e4 1320}
e659a3fe 1321EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1322
225a9be2
RA		 1323#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1324#define SAVESTATE_RESULT_SIZE 10
1325
1326static struct tpm_input_header savestate_header = {
1327 .tag = TPM_TAG_RQU_COMMAND,
1328 .length = cpu_to_be32(10),
1329 .ordinal = TPM_ORD_SAVESTATE
1330};
1331
1da177e4
LT		 1332/*
1333 * We are about to suspend. Save the TPM state
1334 * so that it can be restored.
1335 */
035e2ce8 1336int tpm_pm_suspend(struct device *dev)
1da177e4 1337{
ce2c87d4 1338 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2 1339 struct tpm_cmd_t cmd;
32d33b29 1340 int rc, try;
225a9be2
RA		 1341
1342 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1343
1da177e4
LT		 1344 if (chip == NULL)
1345 return -ENODEV;
1346
225a9be2
RA		 1347 /* for buggy tpm, flush pcrs with extend to selected dummy */
1348 if (tpm_suspend_pcr) {
1349 cmd.header.in = pcrextend_header;
1350 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1351 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1352 TPM_DIGEST_SIZE);
1353 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1354 "extending dummy pcr before suspend");
1355 }
1356
1357 /* now do the actual savestate */
32d33b29
DL		 1358 for (try = 0; try < TPM_RETRY; try++) {
1359 cmd.header.in = savestate_header;
1360 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
1361
1362 /*
1363 * If the TPM indicates that it is too busy to respond to
1364 * this command then retry before giving up. It can take
1365 * several seconds for this TPM to be ready.
1366 *
1367 * This can happen if the TPM has already been sent the
1368 * SaveState command before the driver has loaded. TCG 1.2
1369 * specification states that any communication after SaveState
1370 * may cause the TPM to invalidate previously saved state.
1371 */
1372 if (rc != TPM_WARN_RETRY)
1373 break;
1374 msleep(TPM_TIMEOUT_RETRY);
1375 }
1376
1377 if (rc)
1378 dev_err(chip->dev,
1379 "Error (%d) sending savestate before suspend\n", rc);
1380 else if (try > 0)
1381 dev_warn(chip->dev, "TPM savestate took %dms\n",
1382 try * TPM_TIMEOUT_RETRY);
1383
225a9be2 1384 return rc;
1da177e4 1385}
1da177e4
LT		 1386EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1387
1388/*
1389 * Resume from a power safe. The BIOS already restored
1390 * the TPM state.
1391 */
ce2c87d4 1392int tpm_pm_resume(struct device *dev)
1da177e4 1393{
ce2c87d4 1394 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1395
1396 if (chip == NULL)
1397 return -ENODEV;
1398
1da177e4
LT		 1399 return 0;
1400}
1da177e4
LT		 1401EXPORT_SYMBOL_GPL(tpm_pm_resume);
1402
41ab999c
KY		 1403#define TPM_GETRANDOM_RESULT_SIZE 18
1404static struct tpm_input_header tpm_getrandom_header = {
1405 .tag = TPM_TAG_RQU_COMMAND,
1406 .length = cpu_to_be32(14),
1407 .ordinal = TPM_ORD_GET_RANDOM
1408};
1409
1410/**
1411 * tpm_get_random() - Get random bytes from the tpm's RNG
1412 * @chip_num: A specific chip number for the request or TPM_ANY_NUM
1413 * @out: destination buffer for the random bytes
1414 * @max: the max number of bytes to write to @out
1415 *
1416 * Returns < 0 on error and the number of bytes read on success
1417 */
1418int tpm_get_random(u32 chip_num, u8 *out, size_t max)
1419{
1420 struct tpm_chip *chip;
1421 struct tpm_cmd_t tpm_cmd;
1422 u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
1423 int err, total = 0, retries = 5;
1424 u8 *dest = out;
1425
d4281c33
JS		 1426 if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
1427 return -EINVAL;
1428
41ab999c
KY		 1429 chip = tpm_chip_find_get(chip_num);
1430 if (chip == NULL)
1431 return -ENODEV;
1432
41ab999c
KY		 1433 do {
1434 tpm_cmd.header.in = tpm_getrandom_header;
1435 tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
1436
1437 err = transmit_cmd(chip, &tpm_cmd,
1438 TPM_GETRANDOM_RESULT_SIZE + num_bytes,
1439 "attempting get random");
1440 if (err)
1441 break;
1442
1443 recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
1444 memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
1445
1446 dest += recd;
1447 total += recd;
1448 num_bytes -= recd;
1449 } while (retries-- && total < max);
1450
d4281c33 1451 tpm_chip_put(chip);
41ab999c
KY		 1452 return total ? total : -EIO;
1453}
1454EXPORT_SYMBOL_GPL(tpm_get_random);
1455
253115b7
RA		 1456/* In case vendor provided release function, call it too.*/
1457
1458void tpm_dev_vendor_release(struct tpm_chip *chip)
1459{
3072928f
AS		 1460 if (!chip)
1461 return;
1462
253115b7
RA		 1463 if (chip->vendor.release)
1464 chip->vendor.release(chip->dev);
1465
1466 clear_bit(chip->dev_num, dev_mask);
1467 kfree(chip->vendor.miscdev.name);
1468}
1469EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1470
1471
5bd91f18
RM		 1472/*
1473 * Once all references to platform device are down to 0,
1474 * release all allocated structures.
5bd91f18 1475 */
81198078 1476static void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1477{
1478 struct tpm_chip *chip = dev_get_drvdata(dev);
1479
3072928f
AS		 1480 if (!chip)
1481 return;
1482
253115b7 1483 tpm_dev_vendor_release(chip);
5bd91f18 1484
253115b7 1485 chip->release(dev);
5bd91f18
RM		 1486 kfree(chip);
1487}
253115b7 1488EXPORT_SYMBOL_GPL(tpm_dev_release);
5bd91f18 1489
1da177e4
LT		 1490/*
1491 * Called from tpm_<specific>.c probe function only for devices
1492 * the driver has determined it should claim. Prior to calling
1493 * this function the specific probe function has called pci_enable_device
1494 * upon errant exit from this function specific probe function should call
1495 * pci_disable_device
1496 */
f02a9364
RA		 1497struct tpm_chip *tpm_register_hardware(struct device *dev,
1498 const struct tpm_vendor_specific *entry)
1da177e4 1499{
6f9beccb
KJH		 1500#define DEVNAME_SIZE 7
1501
1502 char *devname;
1da177e4 1503 struct tpm_chip *chip;
1da177e4
LT		 1504
1505 /* Driver specific per-device data */
b888c87b 1506 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933
PW		 1507 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1508
dd78c943
AM		 1509 if (chip == NULL || devname == NULL)
1510 goto out_free;
1da177e4 1511
d081d470
MK		 1512 mutex_init(&chip->buffer_mutex);
1513 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1514 INIT_LIST_HEAD(&chip->list);
1515
c4028958 1516 INIT_WORK(&chip->work, timeout_work);
09e12f9f 1517
40565f19
JS		 1518 setup_timer(&chip->user_read_timer, user_reader_timeout,
1519 (unsigned long)chip);
fe3fd483 1520
90dda520 1521 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1522
10685a95 1523 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1524
10685a95 1525 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1526 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1527 goto out_free;
1da177e4 1528 } else if (chip->dev_num == 0)
90dda520 1529 chip->vendor.miscdev.minor = TPM_MINOR;
1da177e4 1530 else
90dda520 1531 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1da177e4 1532
10685a95
KJH		 1533 set_bit(chip->dev_num, dev_mask);
1534
6f9beccb 1535 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
90dda520 1536 chip->vendor.miscdev.name = devname;
1da177e4 1537
94fbcded 1538 chip->vendor.miscdev.parent = dev;
e659a3fe 1539 chip->dev = get_device(dev);
5bd91f18
RM		 1540 chip->release = dev->release;
1541 dev->release = tpm_dev_release;
1542 dev_set_drvdata(dev, chip);
1da177e4 1543
90dda520 1544 if (misc_register(&chip->vendor.miscdev)) {
e659a3fe 1545 dev_err(chip->dev,
1da177e4 1546 "unable to misc_register %s, minor %d\n",
90dda520
KJH		 1547 chip->vendor.miscdev.name,
1548 chip->vendor.miscdev.minor);
dad79cb8 1549 goto put_device;
1da177e4
LT		 1550 }
1551
f33d9bd5 1552 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
5d469ec0 1553 misc_deregister(&chip->vendor.miscdev);
dad79cb8 1554 goto put_device;
f33d9bd5 1555 }
1da177e4 1556
1631cfb7 1557 if (tpm_add_ppi(&dev->kobj)) {
f84fdff0
XZ		 1558 misc_deregister(&chip->vendor.miscdev);
1559 goto put_device;
1560 }
1561
55a82ab3
KJH		 1562 chip->bios_dir = tpm_bios_log_setup(devname);
1563
f02a9364
RA		 1564 /* Make chip available */
1565 spin_lock(&driver_lock);
1566 list_add_rcu(&chip->list, &tpm_chip_list);
1567 spin_unlock(&driver_lock);
1568
e0dd03ca 1569 return chip;
dd78c943 1570
dad79cb8
WG		 1571put_device:
1572 put_device(chip->dev);
dd78c943
AM		 1573out_free:
1574 kfree(chip);
1575 kfree(devname);
1576 return NULL;
1da177e4 1577}
1da177e4
LT		 1578EXPORT_SYMBOL_GPL(tpm_register_hardware);
1579
1da177e4
LT		 1580MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1581MODULE_DESCRIPTION("TPM Driver");
1582MODULE_VERSION("2.0");
1583MODULE_LICENSE("GPL");
kernel source for telekom puls (alcatel/mediatek)