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tpm: Pull everything related to /dev/tpmX into tpm-dev.c
[deliverable/linux.git] / drivers / char / tpm / tpm-interface.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).
0a418269 13 * Specifications at www.trustedcomputinggroup.org
1da177e4
LT		 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.
0a418269 19 *
1da177e4
LT		 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
9e18ee19
KJH		 315/*
316 * Returns max number of jiffies to wait
317 */
318unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
319 u32 ordinal)
320{
321 int duration_idx = TPM_UNDEFINED;
322 int duration = 0;
07b133e6 323 u8 category = (ordinal >> 24) & 0xFF;
9e18ee19 324
07b133e6
PH		 325 if ((category == TPM_PROTECTED_COMMAND && ordinal < TPM_MAX_ORDINAL) ||
326 (category == TPM_CONNECTION_COMMAND && ordinal < TSC_MAX_ORDINAL))
9e18ee19 327 duration_idx = tpm_ordinal_duration[ordinal];
9e18ee19 328
8d1dc20e 329 if (duration_idx != TPM_UNDEFINED)
36b20020 330 duration = chip->vendor.duration[duration_idx];
8d1dc20e 331 if (duration <= 0)
9e18ee19 332 return 2 * 60 * HZ;
8d1dc20e
LT		 333 else
334 return duration;
9e18ee19
KJH		 335}
336EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
337
1da177e4
LT		 338/*
339 * Internal kernel interface to transmit TPM commands
340 */
afdba32e
JG		 341ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
342 size_t bufsiz)
1da177e4 343{
d9e5b6bf 344 ssize_t rc;
9e18ee19 345 u32 count, ordinal;
700d8bdc 346 unsigned long stop;
1da177e4 347
6b07d30a
PH		 348 if (bufsiz > TPM_BUFSIZE)
349 bufsiz = TPM_BUFSIZE;
350
81179bb6 351 count = be32_to_cpu(*((__be32 *) (buf + 2)));
9e18ee19 352 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
1da177e4
LT		 353 if (count == 0)
354 return -ENODATA;
355 if (count > bufsiz) {
e659a3fe 356 dev_err(chip->dev,
0a418269 357 "invalid count value %x %zx\n", count, bufsiz);
1da177e4
LT		 358 return -E2BIG;
359 }
360
d081d470 361 mutex_lock(&chip->tpm_mutex);
1da177e4 362
0a418269
PH		 363 rc = chip->vendor.send(chip, (u8 *) buf, count);
364 if (rc < 0) {
e659a3fe 365 dev_err(chip->dev,
d9e5b6bf
KH		 366 "tpm_transmit: tpm_send: error %zd\n", rc);
367 goto out;
1da177e4
LT		 368 }
369
27084efe
LD		 370 if (chip->vendor.irq)
371 goto out_recv;
372
9e18ee19 373 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
1da177e4 374 do {
90dda520
KJH		 375 u8 status = chip->vendor.status(chip);
376 if ((status & chip->vendor.req_complete_mask) ==
377 chip->vendor.req_complete_val)
1da177e4 378 goto out_recv;
d9e5b6bf 379
1f866057 380 if (chip->vendor.req_canceled(chip, status)) {
e659a3fe 381 dev_err(chip->dev, "Operation Canceled\n");
d9e5b6bf
KH		 382 rc = -ECANCELED;
383 goto out;
384 }
385
386 msleep(TPM_TIMEOUT); /* CHECK */
1da177e4 387 rmb();
700d8bdc 388 } while (time_before(jiffies, stop));
1da177e4 389
90dda520 390 chip->vendor.cancel(chip);
e659a3fe 391 dev_err(chip->dev, "Operation Timed out\n");
d9e5b6bf
KH		 392 rc = -ETIME;
393 goto out;
1da177e4
LT		 394
395out_recv:
90dda520 396 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
d9e5b6bf 397 if (rc < 0)
e659a3fe 398 dev_err(chip->dev,
d9e5b6bf
KH		 399 "tpm_transmit: tpm_recv: error %zd\n", rc);
400out:
d081d470 401 mutex_unlock(&chip->tpm_mutex);
d9e5b6bf 402 return rc;
1da177e4
LT		 403}
404
405#define TPM_DIGEST_SIZE 20
beed53a1 406#define TPM_RET_CODE_IDX 6
beed53a1
KJH		 407
408enum tpm_capabilities {
08837438
RA		 409 TPM_CAP_FLAG = cpu_to_be32(4),
410 TPM_CAP_PROP = cpu_to_be32(5),
411 CAP_VERSION_1_1 = cpu_to_be32(0x06),
412 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
beed53a1
KJH		 413};
414
415enum tpm_sub_capabilities {
08837438
RA		 416 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
417 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
418 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
419 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
420 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
421 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
422 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
beed53a1 423
1da177e4
LT		 424};
425
08837438
RA		 426static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
427 int len, const char *desc)
beed53a1
KJH		 428{
429 int err;
430
0a418269 431 len = tpm_transmit(chip, (u8 *) cmd, len);
beed53a1
KJH		 432 if (len < 0)
433 return len;
b9e3238a
RA		 434 else if (len < TPM_HEADER_SIZE)
435 return -EFAULT;
436
437 err = be32_to_cpu(cmd->header.out.return_code);
c584af19 438 if (err != 0 && desc)
b9e3238a
RA		 439 dev_err(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
440
441 return err;
beed53a1
KJH		 442}
443
08837438
RA		 444#define TPM_INTERNAL_RESULT_SIZE 200
445#define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
446#define TPM_ORD_GET_CAP cpu_to_be32(101)
41ab999c 447#define TPM_ORD_GET_RANDOM cpu_to_be32(70)
08837438
RA		 448
449static const struct tpm_input_header tpm_getcap_header = {
450 .tag = TPM_TAG_RQU_COMMAND,
451 .length = cpu_to_be32(22),
452 .ordinal = TPM_ORD_GET_CAP
453};
454
455ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
456 const char *desc)
457{
458 struct tpm_cmd_t tpm_cmd;
459 int rc;
460 struct tpm_chip *chip = dev_get_drvdata(dev);
461
462 tpm_cmd.header.in = tpm_getcap_header;
463 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
464 tpm_cmd.params.getcap_in.cap = subcap_id;
465 /*subcap field not necessary */
466 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
467 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
468 } else {
469 if (subcap_id == TPM_CAP_FLAG_PERM ||
470 subcap_id == TPM_CAP_FLAG_VOL)
471 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
472 else
473 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
474 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
475 tpm_cmd.params.getcap_in.subcap = subcap_id;
476 }
477 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
478 if (!rc)
479 *cap = tpm_cmd.params.getcap_out.cap;
480 return rc;
481}
482
08e96e48
KJH		 483void tpm_gen_interrupt(struct tpm_chip *chip)
484{
08837438 485 struct tpm_cmd_t tpm_cmd;
08e96e48
KJH		 486 ssize_t rc;
487
08837438
RA		 488 tpm_cmd.header.in = tpm_getcap_header;
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 = TPM_CAP_PROP_TIS_TIMEOUT;
08e96e48 492
08837438 493 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 494 "attempting to determine the timeouts");
495}
496EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
497
c584af19
JG		 498#define TPM_ORD_STARTUP cpu_to_be32(153)
499#define TPM_ST_CLEAR cpu_to_be16(1)
500#define TPM_ST_STATE cpu_to_be16(2)
501#define TPM_ST_DEACTIVATED cpu_to_be16(3)
502static const struct tpm_input_header tpm_startup_header = {
503 .tag = TPM_TAG_RQU_COMMAND,
504 .length = cpu_to_be32(12),
505 .ordinal = TPM_ORD_STARTUP
506};
507
508static int tpm_startup(struct tpm_chip *chip, __be16 startup_type)
509{
510 struct tpm_cmd_t start_cmd;
511 start_cmd.header.in = tpm_startup_header;
512 start_cmd.params.startup_in.startup_type = startup_type;
513 return transmit_cmd(chip, &start_cmd, TPM_INTERNAL_RESULT_SIZE,
514 "attempting to start the TPM");
515}
516
2b30a90f 517int tpm_get_timeouts(struct tpm_chip *chip)
08e96e48 518{
08837438
RA		 519 struct tpm_cmd_t tpm_cmd;
520 struct timeout_t *timeout_cap;
521 struct duration_t *duration_cap;
08e96e48
KJH		 522 ssize_t rc;
523 u32 timeout;
e3e1a1e1 524 unsigned int scale = 1;
08e96e48 525
08837438
RA		 526 tpm_cmd.header.in = tpm_getcap_header;
527 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
528 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
529 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
c584af19 530 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, NULL);
08e96e48 531
c584af19
JG		 532 if (rc == TPM_ERR_INVALID_POSTINIT) {
533 /* The TPM is not started, we are the first to talk to it.
534 Execute a startup command. */
535 dev_info(chip->dev, "Issuing TPM_STARTUP");
536 if (tpm_startup(chip, TPM_ST_CLEAR))
537 return rc;
538
539 tpm_cmd.header.in = tpm_getcap_header;
540 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
541 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
542 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
543 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
544 NULL);
545 }
546 if (rc) {
547 dev_err(chip->dev,
548 "A TPM error (%zd) occurred attempting to determine the timeouts\n",
549 rc);
08e96e48 550 goto duration;
c584af19 551 }
08e96e48 552
829bf067
SB		 553 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
554 be32_to_cpu(tpm_cmd.header.out.length)
555 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32))
2b30a90f 556 return -EINVAL;
08e96e48 557
08837438 558 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
08e96e48 559 /* Don't overwrite default if value is 0 */
08837438 560 timeout = be32_to_cpu(timeout_cap->a);
e3e1a1e1
SB		 561 if (timeout && timeout < 1000) {
562 /* timeouts in msec rather usec */
563 scale = 1000;
62592101 564 chip->vendor.timeout_adjusted = true;
e3e1a1e1 565 }
08e96e48 566 if (timeout)
e3e1a1e1 567 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
08837438 568 timeout = be32_to_cpu(timeout_cap->b);
08e96e48 569 if (timeout)
e3e1a1e1 570 chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale);
08837438 571 timeout = be32_to_cpu(timeout_cap->c);
08e96e48 572 if (timeout)
e3e1a1e1 573 chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale);
08837438 574 timeout = be32_to_cpu(timeout_cap->d);
08e96e48 575 if (timeout)
e3e1a1e1 576 chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale);
08e96e48
KJH		 577
578duration:
08837438
RA		 579 tpm_cmd.header.in = tpm_getcap_header;
580 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
581 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
582 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
08e96e48 583
08837438 584 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
08e96e48
KJH		 585 "attempting to determine the durations");
586 if (rc)
2b30a90f 587 return rc;
08e96e48 588
979b1406
SB		 589 if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 ||
590 be32_to_cpu(tpm_cmd.header.out.length)
591 != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32))
2b30a90f 592 return -EINVAL;
979b1406 593
08837438 594 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
08e96e48 595 chip->vendor.duration[TPM_SHORT] =
08837438 596 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
e934acca
SB		 597 chip->vendor.duration[TPM_MEDIUM] =
598 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
599 chip->vendor.duration[TPM_LONG] =
600 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
601
292cf4a8
VK		 602 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
603 * value wrong and apparently reports msecs rather than usecs. So we
604 * fix up the resulting too-small TPM_SHORT value to make things work.
e934acca 605 * We also scale the TPM_MEDIUM and -_LONG values by 1000.
292cf4a8 606 */
e934acca 607 if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) {
292cf4a8 608 chip->vendor.duration[TPM_SHORT] = HZ;
e934acca
SB		 609 chip->vendor.duration[TPM_MEDIUM] *= 1000;
610 chip->vendor.duration[TPM_LONG] *= 1000;
04ab2293 611 chip->vendor.duration_adjusted = true;
e934acca
SB		 612 dev_info(chip->dev, "Adjusting TPM timeout parameters.");
613 }
2b30a90f 614 return 0;
08e96e48
KJH		 615}
616EXPORT_SYMBOL_GPL(tpm_get_timeouts);
617
d97c6ade
SB		 618#define TPM_ORD_CONTINUE_SELFTEST 83
619#define CONTINUE_SELFTEST_RESULT_SIZE 10
620
621static struct tpm_input_header continue_selftest_header = {
622 .tag = TPM_TAG_RQU_COMMAND,
623 .length = cpu_to_be32(10),
624 .ordinal = cpu_to_be32(TPM_ORD_CONTINUE_SELFTEST),
625};
626
627/**
628 * tpm_continue_selftest -- run TPM's selftest
629 * @chip: TPM chip to use
630 *
631 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
632 * a TPM error code.
633 */
68d6e671 634static int tpm_continue_selftest(struct tpm_chip *chip)
08e96e48 635{
d97c6ade
SB		 636 int rc;
637 struct tpm_cmd_t cmd;
08e96e48 638
d97c6ade
SB		 639 cmd.header.in = continue_selftest_header;
640 rc = transmit_cmd(chip, &cmd, CONTINUE_SELFTEST_RESULT_SIZE,
641 "continue selftest");
642 return rc;
08e96e48 643}
08e96e48 644
0a418269 645ssize_t tpm_show_enabled(struct device *dev, struct device_attribute *attr,
08e96e48
KJH		 646 char *buf)
647{
08837438 648 cap_t cap;
08e96e48
KJH		 649 ssize_t rc;
650
08837438
RA		 651 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
652 "attempting to determine the permanent enabled state");
653 if (rc)
08e96e48 654 return 0;
ec288bd3 655
08837438 656 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
ec288bd3 657 return rc;
08e96e48
KJH		 658}
659EXPORT_SYMBOL_GPL(tpm_show_enabled);
660
0a418269 661ssize_t tpm_show_active(struct device *dev, struct device_attribute *attr,
08e96e48
KJH		 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 active state");
669 if (rc)
08e96e48 670 return 0;
ec288bd3 671
08837438 672 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
ec288bd3 673 return rc;
08e96e48
KJH		 674}
675EXPORT_SYMBOL_GPL(tpm_show_active);
676
0a418269 677ssize_t tpm_show_owned(struct device *dev, struct device_attribute *attr,
08e96e48
KJH		 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_PROP_OWNER, &cap,
684 "attempting to determine the owner state");
685 if (rc)
08e96e48 686 return 0;
ec288bd3 687
08837438 688 rc = sprintf(buf, "%d\n", cap.owned);
ec288bd3 689 return rc;
08e96e48
KJH		 690}
691EXPORT_SYMBOL_GPL(tpm_show_owned);
692
0a418269
PH		 693ssize_t tpm_show_temp_deactivated(struct device *dev,
694 struct device_attribute *attr, char *buf)
08e96e48 695{
08837438 696 cap_t cap;
08e96e48
KJH		 697 ssize_t rc;
698
08837438
RA		 699 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
700 "attempting to determine the temporary state");
701 if (rc)
08e96e48 702 return 0;
ec288bd3 703
08837438 704 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
ec288bd3 705 return rc;
08e96e48
KJH		 706}
707EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
708
659aaf2b
RA		 709/*
710 * tpm_chip_find_get - return tpm_chip for given chip number
711 */
712static struct tpm_chip *tpm_chip_find_get(int chip_num)
713{
8920d5ad 714 struct tpm_chip *pos, *chip = NULL;
659aaf2b
RA		 715
716 rcu_read_lock();
717 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
718 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
719 continue;
720
8920d5ad
RA		 721 if (try_module_get(pos->dev->driver->owner)) {
722 chip = pos;
659aaf2b 723 break;
8920d5ad 724 }
659aaf2b
RA		 725 }
726 rcu_read_unlock();
8920d5ad 727 return chip;
659aaf2b
RA		 728}
729
730#define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
731#define READ_PCR_RESULT_SIZE 30
732static struct tpm_input_header pcrread_header = {
733 .tag = TPM_TAG_RQU_COMMAND,
734 .length = cpu_to_be32(14),
735 .ordinal = TPM_ORDINAL_PCRREAD
1da177e4
LT		 736};
737
68d6e671 738static int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
659aaf2b
RA		 739{
740 int rc;
741 struct tpm_cmd_t cmd;
742
743 cmd.header.in = pcrread_header;
744 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
23acb98d 745 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
659aaf2b
RA		 746 "attempting to read a pcr value");
747
748 if (rc == 0)
749 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
750 TPM_DIGEST_SIZE);
751 return rc;
752}
753
754/**
755 * tpm_pcr_read - read a pcr value
0a418269 756 * @chip_num: tpm idx # or ANY
659aaf2b 757 * @pcr_idx: pcr idx to retrieve
0a418269
PH		 758 * @res_buf: TPM_PCR value
759 * size of res_buf is 20 bytes (or NULL if you don't care)
659aaf2b
RA		 760 *
761 * The TPM driver should be built-in, but for whatever reason it
762 * isn't, protect against the chip disappearing, by incrementing
763 * the module usage count.
764 */
765int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
766{
767 struct tpm_chip *chip;
768 int rc;
769
770 chip = tpm_chip_find_get(chip_num);
771 if (chip == NULL)
772 return -ENODEV;
773 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
a0e39349 774 tpm_chip_put(chip);
659aaf2b
RA		 775 return rc;
776}
777EXPORT_SYMBOL_GPL(tpm_pcr_read);
778
779/**
780 * tpm_pcr_extend - extend pcr value with hash
0a418269 781 * @chip_num: tpm idx # or AN&
659aaf2b 782 * @pcr_idx: pcr idx to extend
0a418269 783 * @hash: hash value used to extend pcr value
659aaf2b
RA		 784 *
785 * The TPM driver should be built-in, but for whatever reason it
786 * isn't, protect against the chip disappearing, by incrementing
787 * the module usage count.
788 */
789#define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
0afd9056 790#define EXTEND_PCR_RESULT_SIZE 34
659aaf2b
RA		 791static struct tpm_input_header pcrextend_header = {
792 .tag = TPM_TAG_RQU_COMMAND,
793 .length = cpu_to_be32(34),
794 .ordinal = TPM_ORD_PCR_EXTEND
795};
796
797int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
798{
799 struct tpm_cmd_t cmd;
800 int rc;
801 struct tpm_chip *chip;
802
803 chip = tpm_chip_find_get(chip_num);
804 if (chip == NULL)
805 return -ENODEV;
806
807 cmd.header.in = pcrextend_header;
659aaf2b
RA		 808 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
809 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
0afd9056 810 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
659aaf2b
RA		 811 "attempting extend a PCR value");
812
a0e39349 813 tpm_chip_put(chip);
659aaf2b
RA		 814 return rc;
815}
816EXPORT_SYMBOL_GPL(tpm_pcr_extend);
817
68d6e671
SB		 818/**
819 * tpm_do_selftest - have the TPM continue its selftest and wait until it
820 * can receive further commands
821 * @chip: TPM chip to use
822 *
823 * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
824 * a TPM error code.
825 */
826int tpm_do_selftest(struct tpm_chip *chip)
827{
828 int rc;
68d6e671 829 unsigned int loops;
4643826a 830 unsigned int delay_msec = 100;
68d6e671 831 unsigned long duration;
24ebe667 832 struct tpm_cmd_t cmd;
68d6e671 833
0a418269 834 duration = tpm_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
68d6e671
SB		 835
836 loops = jiffies_to_msecs(duration) / delay_msec;
837
838 rc = tpm_continue_selftest(chip);
839 /* This may fail if there was no TPM driver during a suspend/resume
840 * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
841 */
842 if (rc)
843 return rc;
844
845 do {
24ebe667
RA		 846 /* Attempt to read a PCR value */
847 cmd.header.in = pcrread_header;
848 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(0);
849 rc = tpm_transmit(chip, (u8 *) &cmd, READ_PCR_RESULT_SIZE);
4643826a
JG		 850 /* Some buggy TPMs will not respond to tpm_tis_ready() for
851 * around 300ms while the self test is ongoing, keep trying
852 * until the self test duration expires. */
853 if (rc == -ETIME) {
854 dev_info(chip->dev, HW_ERR "TPM command timed out during continue self test");
855 msleep(delay_msec);
856 continue;
857 }
24ebe667
RA		 858
859 if (rc < TPM_HEADER_SIZE)
860 return -EFAULT;
861
862 rc = be32_to_cpu(cmd.header.out.return_code);
be405411
SB		 863 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
864 dev_info(chip->dev,
865 "TPM is disabled/deactivated (0x%X)\n", rc);
866 /* TPM is disabled and/or deactivated; driver can
867 * proceed and TPM does handle commands for
868 * suspend/resume correctly
869 */
870 return 0;
871 }
68d6e671
SB		 872 if (rc != TPM_WARN_DOING_SELFTEST)
873 return rc;
874 msleep(delay_msec);
875 } while (--loops > 0);
876
877 return rc;
878}
879EXPORT_SYMBOL_GPL(tpm_do_selftest);
880
c749ba91
MZ		 881int tpm_send(u32 chip_num, void *cmd, size_t buflen)
882{
883 struct tpm_chip *chip;
884 int rc;
885
886 chip = tpm_chip_find_get(chip_num);
887 if (chip == NULL)
888 return -ENODEV;
889
890 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
891
892 tpm_chip_put(chip);
893 return rc;
894}
895EXPORT_SYMBOL_GPL(tpm_send);
896
6659ca2a
KH		 897ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
898 char *buf)
1da177e4 899{
08837438 900 cap_t cap;
659aaf2b 901 u8 digest[TPM_DIGEST_SIZE];
beed53a1 902 ssize_t rc;
81179bb6 903 int i, j, num_pcrs;
1da177e4 904 char *str = buf;
e659a3fe 905 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 906
08837438 907 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
beed53a1 908 "attempting to determine the number of PCRS");
08837438 909 if (rc)
e234bc97 910 return 0;
1da177e4 911
08837438 912 num_pcrs = be32_to_cpu(cap.num_pcrs);
1da177e4 913 for (i = 0; i < num_pcrs; i++) {
659aaf2b 914 rc = __tpm_pcr_read(chip, i, digest);
beed53a1 915 if (rc)
08837438 916 break;
1da177e4
LT		 917 str += sprintf(str, "PCR-%02d: ", i);
918 for (j = 0; j < TPM_DIGEST_SIZE; j++)
659aaf2b 919 str += sprintf(str, "%02X ", digest[j]);
1da177e4
LT		 920 str += sprintf(str, "\n");
921 }
922 return str - buf;
923}
6659ca2a 924EXPORT_SYMBOL_GPL(tpm_show_pcrs);
1da177e4
LT		 925
926#define READ_PUBEK_RESULT_SIZE 314
08837438 927#define TPM_ORD_READPUBEK cpu_to_be32(124)
81198078 928static struct tpm_input_header tpm_readpubek_header = {
08837438
RA		 929 .tag = TPM_TAG_RQU_COMMAND,
930 .length = cpu_to_be32(30),
931 .ordinal = TPM_ORD_READPUBEK
1da177e4
LT		 932};
933
6659ca2a
KH		 934ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
935 char *buf)
1da177e4 936{
2df7111f 937 u8 *data;
08837438 938 struct tpm_cmd_t tpm_cmd;
beed53a1 939 ssize_t err;
81179bb6 940 int i, rc;
1da177e4
LT		 941 char *str = buf;
942
e659a3fe 943 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4 944
08837438
RA		 945 tpm_cmd.header.in = tpm_readpubek_header;
946 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
beed53a1
KJH		 947 "attempting to read the PUBEK");
948 if (err)
34d6e075 949 goto out;
1da177e4 950
0a418269 951 /*
1da177e4
LT		 952 ignore header 10 bytes
953 algorithm 32 bits (1 == RSA )
954 encscheme 16 bits
955 sigscheme 16 bits
0a418269 956 parameters (RSA 12->bytes: keybit, #primes, expbit)
1da177e4
LT		 957 keylenbytes 32 bits
958 256 byte modulus
959 ignore checksum 20 bytes
960 */
08837438 961 data = tpm_cmd.params.readpubek_out_buffer;
1da177e4
LT		 962 str +=
963 sprintf(str,
5a79444f
SB		 964 "Algorithm: %02X %02X %02X %02X\n"
965 "Encscheme: %02X %02X\n"
966 "Sigscheme: %02X %02X\n"
967 "Parameters: %02X %02X %02X %02X "
968 "%02X %02X %02X %02X "
969 "%02X %02X %02X %02X\n"
970 "Modulus length: %d\n"
971 "Modulus:\n",
972 data[0], data[1], data[2], data[3],
973 data[4], data[5],
974 data[6], data[7],
975 data[12], data[13], data[14], data[15],
976 data[16], data[17], data[18], data[19],
977 data[20], data[21], data[22], data[23],
978 be32_to_cpu(*((__be32 *) (data + 24))));
1da177e4
LT		 979
980 for (i = 0; i < 256; i++) {
5a79444f 981 str += sprintf(str, "%02X ", data[i + 28]);
1da177e4
LT		 982 if ((i + 1) % 16 == 0)
983 str += sprintf(str, "\n");
984 }
34d6e075 985out:
beed53a1 986 rc = str - buf;
2df7111f 987 return rc;
1da177e4 988}
6659ca2a 989EXPORT_SYMBOL_GPL(tpm_show_pubek);
1da177e4 990
1da177e4 991
6659ca2a
KH		 992ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
993 char *buf)
1da177e4 994{
08837438 995 cap_t cap;
beed53a1 996 ssize_t rc;
1da177e4
LT		 997 char *str = buf;
998
08837438 999 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
beed53a1 1000 "attempting to determine the manufacturer");
08837438 1001 if (rc)
beed53a1 1002 return 0;
1da177e4 1003 str += sprintf(str, "Manufacturer: 0x%x\n",
08837438 1004 be32_to_cpu(cap.manufacturer_id));
1da177e4 1005
e907481b 1006 /* Try to get a TPM version 1.2 TPM_CAP_VERSION_INFO */
08837438
RA		 1007 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
1008 "attempting to determine the 1.2 version");
e907481b
JG		 1009 if (!rc) {
1010 str += sprintf(str,
1011 "TCG version: %d.%d\nFirmware version: %d.%d\n",
1012 cap.tpm_version_1_2.Major,
1013 cap.tpm_version_1_2.Minor,
1014 cap.tpm_version_1_2.revMajor,
1015 cap.tpm_version_1_2.revMinor);
1016 } else {
1017 /* Otherwise just use TPM_STRUCT_VER */
1018 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
1019 "attempting to determine the 1.1 version");
1020 if (rc)
1021 return 0;
1022 str += sprintf(str,
1023 "TCG version: %d.%d\nFirmware version: %d.%d\n",
1024 cap.tpm_version.Major,
1025 cap.tpm_version.Minor,
1026 cap.tpm_version.revMajor,
1027 cap.tpm_version.revMinor);
1028 }
1029
08e96e48
KJH		 1030 return str - buf;
1031}
e907481b 1032EXPORT_SYMBOL_GPL(tpm_show_caps);
08e96e48 1033
04ab2293
SB		 1034ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
1035 char *buf)
1036{
1037 struct tpm_chip *chip = dev_get_drvdata(dev);
1038
403d1d03
SB		 1039 if (chip->vendor.duration[TPM_LONG] == 0)
1040 return 0;
1041
04ab2293
SB		 1042 return sprintf(buf, "%d %d %d [%s]\n",
1043 jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
1044 jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
1045 jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
1046 chip->vendor.duration_adjusted
1047 ? "adjusted" : "original");
1048}
1049EXPORT_SYMBOL_GPL(tpm_show_durations);
1050
62592101
SB		 1051ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
1052 char *buf)
1053{
1054 struct tpm_chip *chip = dev_get_drvdata(dev);
1055
1056 return sprintf(buf, "%d %d %d %d [%s]\n",
1057 jiffies_to_usecs(chip->vendor.timeout_a),
1058 jiffies_to_usecs(chip->vendor.timeout_b),
1059 jiffies_to_usecs(chip->vendor.timeout_c),
1060 jiffies_to_usecs(chip->vendor.timeout_d),
1061 chip->vendor.timeout_adjusted
1062 ? "adjusted" : "original");
1063}
1064EXPORT_SYMBOL_GPL(tpm_show_timeouts);
1065
6659ca2a
KH		 1066ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
1067 const char *buf, size_t count)
1068{
1069 struct tpm_chip *chip = dev_get_drvdata(dev);
1070 if (chip == NULL)
1071 return 0;
1072
90dda520 1073 chip->vendor.cancel(chip);
6659ca2a
KH		 1074 return count;
1075}
1076EXPORT_SYMBOL_GPL(tpm_store_cancel);
1da177e4 1077
0a418269
PH		 1078static bool wait_for_tpm_stat_cond(struct tpm_chip *chip, u8 mask,
1079 bool check_cancel, bool *canceled)
78f09cc2
SB		 1080{
1081 u8 status = chip->vendor.status(chip);
1082
1083 *canceled = false;
1084 if ((status & mask) == mask)
1085 return true;
1086 if (check_cancel && chip->vendor.req_canceled(chip, status)) {
1087 *canceled = true;
1088 return true;
1089 }
1090 return false;
1091}
1092
fd048866 1093int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
78f09cc2 1094 wait_queue_head_t *queue, bool check_cancel)
fd048866
RA		 1095{
1096 unsigned long stop;
1097 long rc;
1098 u8 status;
78f09cc2 1099 bool canceled = false;
fd048866
RA		 1100
1101 /* check current status */
1102 status = chip->vendor.status(chip);
1103 if ((status & mask) == mask)
1104 return 0;
1105
1106 stop = jiffies + timeout;
1107
1108 if (chip->vendor.irq) {
1109again:
1110 timeout = stop - jiffies;
1111 if ((long)timeout <= 0)
1112 return -ETIME;
1113 rc = wait_event_interruptible_timeout(*queue,
78f09cc2
SB		 1114 wait_for_tpm_stat_cond(chip, mask, check_cancel,
1115 &canceled),
1116 timeout);
1117 if (rc > 0) {
1118 if (canceled)
1119 return -ECANCELED;
fd048866 1120 return 0;
78f09cc2 1121 }
fd048866
RA		 1122 if (rc == -ERESTARTSYS && freezing(current)) {
1123 clear_thread_flag(TIF_SIGPENDING);
1124 goto again;
1125 }
1126 } else {
1127 do {
1128 msleep(TPM_TIMEOUT);
1129 status = chip->vendor.status(chip);
1130 if ((status & mask) == mask)
1131 return 0;
1132 } while (time_before(jiffies, stop));
1133 }
1134 return -ETIME;
1135}
1136EXPORT_SYMBOL_GPL(wait_for_tpm_stat);
1da177e4 1137
e659a3fe 1138void tpm_remove_hardware(struct device *dev)
1da177e4 1139{
e659a3fe 1140 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1141
1142 if (chip == NULL) {
e659a3fe 1143 dev_err(dev, "No device data found\n");
1da177e4
LT		 1144 return;
1145 }
1146
1147 spin_lock(&driver_lock);
f02a9364 1148 list_del_rcu(&chip->list);
1da177e4 1149 spin_unlock(&driver_lock);
f02a9364 1150 synchronize_rcu();
1da177e4 1151
afdba32e 1152 tpm_dev_del_device(chip);
90dda520 1153 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1631cfb7 1154 tpm_remove_ppi(&dev->kobj);
55a82ab3 1155 tpm_bios_log_teardown(chip->bios_dir);
1da177e4 1156
5bd91f18
RM		 1157 /* write it this way to be explicit (chip->dev == dev) */
1158 put_device(chip->dev);
1da177e4 1159}
e659a3fe 1160EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1da177e4 1161
225a9be2
RA		 1162#define TPM_ORD_SAVESTATE cpu_to_be32(152)
1163#define SAVESTATE_RESULT_SIZE 10
1164
1165static struct tpm_input_header savestate_header = {
1166 .tag = TPM_TAG_RQU_COMMAND,
1167 .length = cpu_to_be32(10),
1168 .ordinal = TPM_ORD_SAVESTATE
1169};
1170
1da177e4
LT		 1171/*
1172 * We are about to suspend. Save the TPM state
1173 * so that it can be restored.
1174 */
035e2ce8 1175int tpm_pm_suspend(struct device *dev)
1da177e4 1176{
ce2c87d4 1177 struct tpm_chip *chip = dev_get_drvdata(dev);
225a9be2 1178 struct tpm_cmd_t cmd;
32d33b29 1179 int rc, try;
225a9be2
RA		 1180
1181 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
2490c681 1182
1da177e4
LT		 1183 if (chip == NULL)
1184 return -ENODEV;
1185
225a9be2
RA		 1186 /* for buggy tpm, flush pcrs with extend to selected dummy */
1187 if (tpm_suspend_pcr) {
1188 cmd.header.in = pcrextend_header;
1189 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1190 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1191 TPM_DIGEST_SIZE);
1192 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1193 "extending dummy pcr before suspend");
1194 }
1195
1196 /* now do the actual savestate */
32d33b29
DL		 1197 for (try = 0; try < TPM_RETRY; try++) {
1198 cmd.header.in = savestate_header;
1199 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, NULL);
1200
1201 /*
1202 * If the TPM indicates that it is too busy to respond to
1203 * this command then retry before giving up. It can take
1204 * several seconds for this TPM to be ready.
1205 *
1206 * This can happen if the TPM has already been sent the
1207 * SaveState command before the driver has loaded. TCG 1.2
1208 * specification states that any communication after SaveState
1209 * may cause the TPM to invalidate previously saved state.
1210 */
1211 if (rc != TPM_WARN_RETRY)
1212 break;
1213 msleep(TPM_TIMEOUT_RETRY);
1214 }
1215
1216 if (rc)
1217 dev_err(chip->dev,
1218 "Error (%d) sending savestate before suspend\n", rc);
1219 else if (try > 0)
1220 dev_warn(chip->dev, "TPM savestate took %dms\n",
1221 try * TPM_TIMEOUT_RETRY);
1222
225a9be2 1223 return rc;
1da177e4 1224}
1da177e4
LT		 1225EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1226
1227/*
1228 * Resume from a power safe. The BIOS already restored
1229 * the TPM state.
1230 */
ce2c87d4 1231int tpm_pm_resume(struct device *dev)
1da177e4 1232{
ce2c87d4 1233 struct tpm_chip *chip = dev_get_drvdata(dev);
1da177e4
LT		 1234
1235 if (chip == NULL)
1236 return -ENODEV;
1237
1da177e4
LT		 1238 return 0;
1239}
1da177e4
LT		 1240EXPORT_SYMBOL_GPL(tpm_pm_resume);
1241
41ab999c
KY		 1242#define TPM_GETRANDOM_RESULT_SIZE 18
1243static struct tpm_input_header tpm_getrandom_header = {
1244 .tag = TPM_TAG_RQU_COMMAND,
1245 .length = cpu_to_be32(14),
1246 .ordinal = TPM_ORD_GET_RANDOM
1247};
1248
1249/**
1250 * tpm_get_random() - Get random bytes from the tpm's RNG
1251 * @chip_num: A specific chip number for the request or TPM_ANY_NUM
1252 * @out: destination buffer for the random bytes
1253 * @max: the max number of bytes to write to @out
1254 *
1255 * Returns < 0 on error and the number of bytes read on success
1256 */
1257int tpm_get_random(u32 chip_num, u8 *out, size_t max)
1258{
1259 struct tpm_chip *chip;
1260 struct tpm_cmd_t tpm_cmd;
1261 u32 recd, num_bytes = min_t(u32, max, TPM_MAX_RNG_DATA);
1262 int err, total = 0, retries = 5;
1263 u8 *dest = out;
1264
1265 chip = tpm_chip_find_get(chip_num);
1266 if (chip == NULL)
1267 return -ENODEV;
1268
1269 if (!out || !num_bytes || max > TPM_MAX_RNG_DATA)
1270 return -EINVAL;
1271
1272 do {
1273 tpm_cmd.header.in = tpm_getrandom_header;
1274 tpm_cmd.params.getrandom_in.num_bytes = cpu_to_be32(num_bytes);
1275
1276 err = transmit_cmd(chip, &tpm_cmd,
1277 TPM_GETRANDOM_RESULT_SIZE + num_bytes,
1278 "attempting get random");
1279 if (err)
1280 break;
1281
1282 recd = be32_to_cpu(tpm_cmd.params.getrandom_out.rng_data_len);
1283 memcpy(dest, tpm_cmd.params.getrandom_out.rng_data, recd);
1284
1285 dest += recd;
1286 total += recd;
1287 num_bytes -= recd;
1288 } while (retries-- && total < max);
1289
1290 return total ? total : -EIO;
1291}
1292EXPORT_SYMBOL_GPL(tpm_get_random);
1293
253115b7
RA		 1294/* In case vendor provided release function, call it too.*/
1295
1296void tpm_dev_vendor_release(struct tpm_chip *chip)
1297{
3072928f
AS		 1298 if (!chip)
1299 return;
1300
253115b7
RA		 1301 if (chip->vendor.release)
1302 chip->vendor.release(chip->dev);
1303
1304 clear_bit(chip->dev_num, dev_mask);
253115b7
RA		 1305}
1306EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1307
1308
5bd91f18
RM		 1309/*
1310 * Once all references to platform device are down to 0,
1311 * release all allocated structures.
5bd91f18 1312 */
afdba32e 1313static void tpm_dev_release(struct device *dev)
5bd91f18
RM		 1314{
1315 struct tpm_chip *chip = dev_get_drvdata(dev);
1316
3072928f
AS		 1317 if (!chip)
1318 return;
1319
253115b7 1320 tpm_dev_vendor_release(chip);
5bd91f18 1321
253115b7 1322 chip->release(dev);
5bd91f18
RM		 1323 kfree(chip);
1324}
1325
1da177e4 1326/*
0a418269 1327 * Called from tpm_<specific>.c probe function only for devices
1da177e4
LT		 1328 * the driver has determined it should claim. Prior to calling
1329 * this function the specific probe function has called pci_enable_device
1330 * upon errant exit from this function specific probe function should call
1331 * pci_disable_device
1332 */
f02a9364
RA		 1333struct tpm_chip *tpm_register_hardware(struct device *dev,
1334 const struct tpm_vendor_specific *entry)
1da177e4 1335{
1da177e4 1336 struct tpm_chip *chip;
1da177e4
LT		 1337
1338 /* Driver specific per-device data */
b888c87b 1339 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
8e39c933 1340
6aff1fdc
JG		 1341 if (chip == NULL)
1342 return NULL;
1da177e4 1343
d081d470 1344 mutex_init(&chip->tpm_mutex);
1da177e4
LT		 1345 INIT_LIST_HEAD(&chip->list);
1346
90dda520 1347 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1da177e4 1348
10685a95 1349 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1da177e4 1350
10685a95 1351 if (chip->dev_num >= TPM_NUM_DEVICES) {
b888c87b 1352 dev_err(dev, "No available tpm device numbers\n");
dd78c943 1353 goto out_free;
afdba32e 1354 }
1da177e4 1355
10685a95
KJH		 1356 set_bit(chip->dev_num, dev_mask);
1357
6aff1fdc
JG		 1358 scnprintf(chip->devname, sizeof(chip->devname), "%s%d", "tpm",
1359 chip->dev_num);
1da177e4 1360
e659a3fe 1361 chip->dev = get_device(dev);
5bd91f18
RM		 1362 chip->release = dev->release;
1363 dev->release = tpm_dev_release;
1364 dev_set_drvdata(dev, chip);
1da177e4 1365
afdba32e 1366 if (tpm_dev_add_device(chip))
dad79cb8 1367 goto put_device;
1da177e4 1368
afdba32e
JG		 1369 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group))
1370 goto del_misc;
1da177e4 1371
afdba32e
JG		 1372 if (tpm_add_ppi(&dev->kobj))
1373 goto del_misc;
f84fdff0 1374
6aff1fdc 1375 chip->bios_dir = tpm_bios_log_setup(chip->devname);
55a82ab3 1376
f02a9364
RA		 1377 /* Make chip available */
1378 spin_lock(&driver_lock);
1379 list_add_rcu(&chip->list, &tpm_chip_list);
1380 spin_unlock(&driver_lock);
1381
e0dd03ca 1382 return chip;
dd78c943 1383
afdba32e
JG		 1384del_misc:
1385 tpm_dev_del_device(chip);
dad79cb8
WG		 1386put_device:
1387 put_device(chip->dev);
dd78c943
AM		 1388out_free:
1389 kfree(chip);
dd78c943 1390 return NULL;
1da177e4 1391}
1da177e4
LT		 1392EXPORT_SYMBOL_GPL(tpm_register_hardware);
1393
1da177e4
LT		 1394MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1395MODULE_DESCRIPTION("TPM Driver");
1396MODULE_VERSION("2.0");
1397MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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