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Merge remote-tracking branch 'cleancache/linux-next'
[linux-2.6/next.git] / drivers / char / tpm / tpm.c
blob7beb0e25f1e1e2ca192ae563eb43f6dc0147f8f8
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 *
10 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
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
22 * calls to msleep.
23 *
24 */
25
26 #include <linux/poll.h>
27 #include <linux/slab.h>
28 #include <linux/mutex.h>
29 #include <linux/spinlock.h>
30
31 #include "tpm.h"
32
33 enum tpm_const {
34 TPM_MINOR = 224, /* officially assigned */
35 TPM_BUFSIZE = 4096,
36 TPM_NUM_DEVICES = 256,
37 };
38
39 enum tpm_duration {
40 TPM_SHORT = 0,
41 TPM_MEDIUM = 1,
42 TPM_LONG = 2,
43 TPM_UNDEFINED,
44 };
45
46 #define TPM_MAX_ORDINAL 243
47 #define TPM_MAX_PROTECTED_ORDINAL 12
48 #define TPM_PROTECTED_ORDINAL_MASK 0xFF
49
50 /*
51 * Bug workaround - some TPM's don't flush the most
52 * recently changed pcr on suspend, so force the flush
53 * with an extend to the selected _unused_ non-volatile pcr.
54 */
55 static int tpm_suspend_pcr;
56 module_param_named(suspend_pcr, tpm_suspend_pcr, uint, 0644);
57 MODULE_PARM_DESC(suspend_pcr,
58 "PCR to use for dummy writes to faciltate flush on suspend.");
59
60 static LIST_HEAD(tpm_chip_list);
61 static DEFINE_SPINLOCK(driver_lock);
62 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
63
64 /*
65 * Array with one entry per ordinal defining the maximum amount
66 * of time the chip could take to return the result. The ordinal
67 * designation of short, medium or long is defined in a table in
68 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
69 * values of the SHORT, MEDIUM, and LONG durations are retrieved
70 * from the chip during initialization with a call to tpm_get_timeouts.
71 */
72 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
73 TPM_UNDEFINED, /* 0 */
74 TPM_UNDEFINED,
75 TPM_UNDEFINED,
76 TPM_UNDEFINED,
77 TPM_UNDEFINED,
78 TPM_UNDEFINED, /* 5 */
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED,
82 TPM_UNDEFINED,
83 TPM_SHORT, /* 10 */
84 TPM_SHORT,
85 };
86
87 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
88 TPM_UNDEFINED, /* 0 */
89 TPM_UNDEFINED,
90 TPM_UNDEFINED,
91 TPM_UNDEFINED,
92 TPM_UNDEFINED,
93 TPM_UNDEFINED, /* 5 */
94 TPM_UNDEFINED,
95 TPM_UNDEFINED,
96 TPM_UNDEFINED,
97 TPM_UNDEFINED,
98 TPM_SHORT, /* 10 */
99 TPM_SHORT,
100 TPM_MEDIUM,
101 TPM_LONG,
102 TPM_LONG,
103 TPM_MEDIUM, /* 15 */
104 TPM_SHORT,
105 TPM_SHORT,
106 TPM_MEDIUM,
107 TPM_LONG,
108 TPM_SHORT, /* 20 */
109 TPM_SHORT,
110 TPM_MEDIUM,
111 TPM_MEDIUM,
112 TPM_MEDIUM,
113 TPM_SHORT, /* 25 */
114 TPM_SHORT,
115 TPM_MEDIUM,
116 TPM_SHORT,
117 TPM_SHORT,
118 TPM_MEDIUM, /* 30 */
119 TPM_LONG,
120 TPM_MEDIUM,
121 TPM_SHORT,
122 TPM_SHORT,
123 TPM_SHORT, /* 35 */
124 TPM_MEDIUM,
125 TPM_MEDIUM,
126 TPM_UNDEFINED,
127 TPM_UNDEFINED,
128 TPM_MEDIUM, /* 40 */
129 TPM_LONG,
130 TPM_MEDIUM,
131 TPM_SHORT,
132 TPM_SHORT,
133 TPM_SHORT, /* 45 */
134 TPM_SHORT,
135 TPM_SHORT,
136 TPM_SHORT,
137 TPM_LONG,
138 TPM_MEDIUM, /* 50 */
139 TPM_MEDIUM,
140 TPM_UNDEFINED,
141 TPM_UNDEFINED,
142 TPM_UNDEFINED,
143 TPM_UNDEFINED, /* 55 */
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_MEDIUM, /* 60 */
149 TPM_MEDIUM,
150 TPM_MEDIUM,
151 TPM_SHORT,
152 TPM_SHORT,
153 TPM_MEDIUM, /* 65 */
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_SHORT, /* 70 */
159 TPM_SHORT,
160 TPM_UNDEFINED,
161 TPM_UNDEFINED,
162 TPM_UNDEFINED,
163 TPM_UNDEFINED, /* 75 */
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_LONG, /* 80 */
169 TPM_UNDEFINED,
170 TPM_MEDIUM,
171 TPM_LONG,
172 TPM_SHORT,
173 TPM_UNDEFINED, /* 85 */
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_SHORT, /* 90 */
179 TPM_SHORT,
180 TPM_SHORT,
181 TPM_SHORT,
182 TPM_SHORT,
183 TPM_UNDEFINED, /* 95 */
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_UNDEFINED,
187 TPM_UNDEFINED,
188 TPM_MEDIUM, /* 100 */
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_UNDEFINED,
192 TPM_UNDEFINED,
193 TPM_UNDEFINED, /* 105 */
194 TPM_UNDEFINED,
195 TPM_UNDEFINED,
196 TPM_UNDEFINED,
197 TPM_UNDEFINED,
198 TPM_SHORT, /* 110 */
199 TPM_SHORT,
200 TPM_SHORT,
201 TPM_SHORT,
202 TPM_SHORT,
203 TPM_SHORT, /* 115 */
204 TPM_SHORT,
205 TPM_SHORT,
206 TPM_UNDEFINED,
207 TPM_UNDEFINED,
208 TPM_LONG, /* 120 */
209 TPM_LONG,
210 TPM_MEDIUM,
211 TPM_UNDEFINED,
212 TPM_SHORT,
213 TPM_SHORT, /* 125 */
214 TPM_SHORT,
215 TPM_LONG,
216 TPM_SHORT,
217 TPM_SHORT,
218 TPM_SHORT, /* 130 */
219 TPM_MEDIUM,
220 TPM_UNDEFINED,
221 TPM_SHORT,
222 TPM_MEDIUM,
223 TPM_UNDEFINED, /* 135 */
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_SHORT, /* 140 */
229 TPM_SHORT,
230 TPM_UNDEFINED,
231 TPM_UNDEFINED,
232 TPM_UNDEFINED,
233 TPM_UNDEFINED, /* 145 */
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_SHORT, /* 150 */
239 TPM_MEDIUM,
240 TPM_MEDIUM,
241 TPM_SHORT,
242 TPM_SHORT,
243 TPM_UNDEFINED, /* 155 */
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_SHORT, /* 160 */
249 TPM_SHORT,
250 TPM_SHORT,
251 TPM_SHORT,
252 TPM_UNDEFINED,
253 TPM_UNDEFINED, /* 165 */
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_UNDEFINED,
258 TPM_LONG, /* 170 */
259 TPM_UNDEFINED,
260 TPM_UNDEFINED,
261 TPM_UNDEFINED,
262 TPM_UNDEFINED,
263 TPM_UNDEFINED, /* 175 */
264 TPM_UNDEFINED,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_MEDIUM, /* 180 */
269 TPM_SHORT,
270 TPM_MEDIUM,
271 TPM_MEDIUM,
272 TPM_MEDIUM,
273 TPM_MEDIUM, /* 185 */
274 TPM_SHORT,
275 TPM_UNDEFINED,
276 TPM_UNDEFINED,
277 TPM_UNDEFINED,
278 TPM_UNDEFINED, /* 190 */
279 TPM_UNDEFINED,
280 TPM_UNDEFINED,
281 TPM_UNDEFINED,
282 TPM_UNDEFINED,
283 TPM_UNDEFINED, /* 195 */
284 TPM_UNDEFINED,
285 TPM_UNDEFINED,
286 TPM_UNDEFINED,
287 TPM_UNDEFINED,
288 TPM_SHORT, /* 200 */
289 TPM_UNDEFINED,
290 TPM_UNDEFINED,
291 TPM_UNDEFINED,
292 TPM_SHORT,
293 TPM_SHORT, /* 205 */
294 TPM_SHORT,
295 TPM_SHORT,
296 TPM_SHORT,
297 TPM_SHORT,
298 TPM_MEDIUM, /* 210 */
299 TPM_UNDEFINED,
300 TPM_MEDIUM,
301 TPM_MEDIUM,
302 TPM_MEDIUM,
303 TPM_UNDEFINED, /* 215 */
304 TPM_MEDIUM,
305 TPM_UNDEFINED,
306 TPM_UNDEFINED,
307 TPM_SHORT,
308 TPM_SHORT, /* 220 */
309 TPM_SHORT,
310 TPM_SHORT,
311 TPM_SHORT,
312 TPM_SHORT,
313 TPM_UNDEFINED, /* 225 */
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_UNDEFINED,
317 TPM_UNDEFINED,
318 TPM_SHORT, /* 230 */
319 TPM_LONG,
320 TPM_MEDIUM,
321 TPM_UNDEFINED,
322 TPM_UNDEFINED,
323 TPM_UNDEFINED, /* 235 */
324 TPM_UNDEFINED,
325 TPM_UNDEFINED,
326 TPM_UNDEFINED,
327 TPM_UNDEFINED,
328 TPM_SHORT, /* 240 */
329 TPM_UNDEFINED,
330 TPM_MEDIUM,
331 };
332
333 static void user_reader_timeout(unsigned long ptr)
334 {
335 struct tpm_chip *chip = (struct tpm_chip *) ptr;
336
337 schedule_work(&chip->work);
338 }
339
340 static void timeout_work(struct work_struct *work)
341 {
342 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
343
344 mutex_lock(&chip->buffer_mutex);
345 atomic_set(&chip->data_pending, 0);
346 memset(chip->data_buffer, 0, TPM_BUFSIZE);
347 mutex_unlock(&chip->buffer_mutex);
348 }
349
350 /*
351 * Returns max number of jiffies to wait
352 */
353 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
354 u32 ordinal)
355 {
356 int duration_idx = TPM_UNDEFINED;
357 int duration = 0;
358
359 if (ordinal < TPM_MAX_ORDINAL)
360 duration_idx = tpm_ordinal_duration[ordinal];
361 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
362 TPM_MAX_PROTECTED_ORDINAL)
363 duration_idx =
364 tpm_protected_ordinal_duration[ordinal &
365 TPM_PROTECTED_ORDINAL_MASK];
366
367 if (duration_idx != TPM_UNDEFINED)
368 duration = chip->vendor.duration[duration_idx];
369 if (duration <= 0)
370 return 2 * 60 * HZ;
371 else
372 return duration;
373 }
374 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
375
376 /*
377 * Internal kernel interface to transmit TPM commands
378 */
379 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
380 size_t bufsiz)
381 {
382 ssize_t rc;
383 u32 count, ordinal;
384 unsigned long stop;
385
386 count = be32_to_cpu(*((__be32 *) (buf + 2)));
387 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
388 if (count == 0)
389 return -ENODATA;
390 if (count > bufsiz) {
391 dev_err(chip->dev,
392 "invalid count value %x %zx \n", count, bufsiz);
393 return -E2BIG;
394 }
395
396 mutex_lock(&chip->tpm_mutex);
397
398 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
399 dev_err(chip->dev,
400 "tpm_transmit: tpm_send: error %zd\n", rc);
401 goto out;
402 }
403
404 if (chip->vendor.irq)
405 goto out_recv;
406
407 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
408 do {
409 u8 status = chip->vendor.status(chip);
410 if ((status & chip->vendor.req_complete_mask) ==
411 chip->vendor.req_complete_val)
412 goto out_recv;
413
414 if ((status == chip->vendor.req_canceled)) {
415 dev_err(chip->dev, "Operation Canceled\n");
416 rc = -ECANCELED;
417 goto out;
418 }
419
420 msleep(TPM_TIMEOUT); /* CHECK */
421 rmb();
422 } while (time_before(jiffies, stop));
423
424 chip->vendor.cancel(chip);
425 dev_err(chip->dev, "Operation Timed out\n");
426 rc = -ETIME;
427 goto out;
428
429 out_recv:
430 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
431 if (rc < 0)
432 dev_err(chip->dev,
433 "tpm_transmit: tpm_recv: error %zd\n", rc);
434 out:
435 mutex_unlock(&chip->tpm_mutex);
436 return rc;
437 }
438
439 #define TPM_DIGEST_SIZE 20
440 #define TPM_ERROR_SIZE 10
441 #define TPM_RET_CODE_IDX 6
442
443 enum tpm_capabilities {
444 TPM_CAP_FLAG = cpu_to_be32(4),
445 TPM_CAP_PROP = cpu_to_be32(5),
446 CAP_VERSION_1_1 = cpu_to_be32(0x06),
447 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
448 };
449
450 enum tpm_sub_capabilities {
451 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
452 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
453 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
454 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
455 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
456 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
457 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
458
459 };
460
461 static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd,
462 int len, const char *desc)
463 {
464 int err;
465
466 len = tpm_transmit(chip,(u8 *) cmd, len);
467 if (len < 0)
468 return len;
469 if (len == TPM_ERROR_SIZE) {
470 err = be32_to_cpu(cmd->header.out.return_code);
471 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
472 return err;
473 }
474 return 0;
475 }
476
477 #define TPM_INTERNAL_RESULT_SIZE 200
478 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
479 #define TPM_ORD_GET_CAP cpu_to_be32(101)
480
481 static const struct tpm_input_header tpm_getcap_header = {
482 .tag = TPM_TAG_RQU_COMMAND,
483 .length = cpu_to_be32(22),
484 .ordinal = TPM_ORD_GET_CAP
485 };
486
487 ssize_t tpm_getcap(struct device *dev, __be32 subcap_id, cap_t *cap,
488 const char *desc)
489 {
490 struct tpm_cmd_t tpm_cmd;
491 int rc;
492 struct tpm_chip *chip = dev_get_drvdata(dev);
493
494 tpm_cmd.header.in = tpm_getcap_header;
495 if (subcap_id == CAP_VERSION_1_1 || subcap_id == CAP_VERSION_1_2) {
496 tpm_cmd.params.getcap_in.cap = subcap_id;
497 /*subcap field not necessary */
498 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(0);
499 tpm_cmd.header.in.length -= cpu_to_be32(sizeof(__be32));
500 } else {
501 if (subcap_id == TPM_CAP_FLAG_PERM ||
502 subcap_id == TPM_CAP_FLAG_VOL)
503 tpm_cmd.params.getcap_in.cap = TPM_CAP_FLAG;
504 else
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 = subcap_id;
508 }
509 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, desc);
510 if (!rc)
511 *cap = tpm_cmd.params.getcap_out.cap;
512 return rc;
513 }
514
515 void tpm_gen_interrupt(struct tpm_chip *chip)
516 {
517 struct tpm_cmd_t tpm_cmd;
518 ssize_t rc;
519
520 tpm_cmd.header.in = tpm_getcap_header;
521 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
522 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
523 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
524
525 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
526 "attempting to determine the timeouts");
527 }
528 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
529
530 void tpm_get_timeouts(struct tpm_chip *chip)
531 {
532 struct tpm_cmd_t tpm_cmd;
533 struct timeout_t *timeout_cap;
534 struct duration_t *duration_cap;
535 ssize_t rc;
536 u32 timeout;
537
538 tpm_cmd.header.in = tpm_getcap_header;
539 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
540 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
541 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT;
542
543 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
544 "attempting to determine the timeouts");
545 if (rc)
546 goto duration;
547
548 if (be32_to_cpu(tpm_cmd.header.out.length)
549 != 4 * sizeof(u32))
550 goto duration;
551
552 timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout;
553 /* Don't overwrite default if value is 0 */
554 timeout = be32_to_cpu(timeout_cap->a);
555 if (timeout)
556 chip->vendor.timeout_a = usecs_to_jiffies(timeout);
557 timeout = be32_to_cpu(timeout_cap->b);
558 if (timeout)
559 chip->vendor.timeout_b = usecs_to_jiffies(timeout);
560 timeout = be32_to_cpu(timeout_cap->c);
561 if (timeout)
562 chip->vendor.timeout_c = usecs_to_jiffies(timeout);
563 timeout = be32_to_cpu(timeout_cap->d);
564 if (timeout)
565 chip->vendor.timeout_d = usecs_to_jiffies(timeout);
566
567 duration:
568 tpm_cmd.header.in = tpm_getcap_header;
569 tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP;
570 tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4);
571 tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION;
572
573 rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE,
574 "attempting to determine the durations");
575 if (rc)
576 return;
577
578 if (be32_to_cpu(tpm_cmd.header.out.return_code)
579 != 3 * sizeof(u32))
580 return;
581 duration_cap = &tpm_cmd.params.getcap_out.cap.duration;
582 chip->vendor.duration[TPM_SHORT] =
583 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short));
584 /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
585 * value wrong and apparently reports msecs rather than usecs. So we
586 * fix up the resulting too-small TPM_SHORT value to make things work.
587 */
588 if (chip->vendor.duration[TPM_SHORT] < (HZ/100))
589 chip->vendor.duration[TPM_SHORT] = HZ;
590
591 chip->vendor.duration[TPM_MEDIUM] =
592 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium));
593 chip->vendor.duration[TPM_LONG] =
594 usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long));
595 }
596 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
597
598 void tpm_continue_selftest(struct tpm_chip *chip)
599 {
600 u8 data[] = {
601 0, 193, /* TPM_TAG_RQU_COMMAND */
602 0, 0, 0, 10, /* length */
603 0, 0, 0, 83, /* TPM_ORD_GetCapability */
604 };
605
606 tpm_transmit(chip, data, sizeof(data));
607 }
608 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
609
610 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
611 char *buf)
612 {
613 cap_t cap;
614 ssize_t rc;
615
616 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
617 "attempting to determine the permanent enabled state");
618 if (rc)
619 return 0;
620
621 rc = sprintf(buf, "%d\n", !cap.perm_flags.disable);
622 return rc;
623 }
624 EXPORT_SYMBOL_GPL(tpm_show_enabled);
625
626 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
627 char *buf)
628 {
629 cap_t cap;
630 ssize_t rc;
631
632 rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap,
633 "attempting to determine the permanent active state");
634 if (rc)
635 return 0;
636
637 rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated);
638 return rc;
639 }
640 EXPORT_SYMBOL_GPL(tpm_show_active);
641
642 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
643 char *buf)
644 {
645 cap_t cap;
646 ssize_t rc;
647
648 rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap,
649 "attempting to determine the owner state");
650 if (rc)
651 return 0;
652
653 rc = sprintf(buf, "%d\n", cap.owned);
654 return rc;
655 }
656 EXPORT_SYMBOL_GPL(tpm_show_owned);
657
658 ssize_t tpm_show_temp_deactivated(struct device * dev,
659 struct device_attribute * attr, char *buf)
660 {
661 cap_t cap;
662 ssize_t rc;
663
664 rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap,
665 "attempting to determine the temporary state");
666 if (rc)
667 return 0;
668
669 rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated);
670 return rc;
671 }
672 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
673
674 /*
675 * tpm_chip_find_get - return tpm_chip for given chip number
676 */
677 static struct tpm_chip *tpm_chip_find_get(int chip_num)
678 {
679 struct tpm_chip *pos, *chip = NULL;
680
681 rcu_read_lock();
682 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
683 if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num)
684 continue;
685
686 if (try_module_get(pos->dev->driver->owner)) {
687 chip = pos;
688 break;
689 }
690 }
691 rcu_read_unlock();
692 return chip;
693 }
694
695 #define TPM_ORDINAL_PCRREAD cpu_to_be32(21)
696 #define READ_PCR_RESULT_SIZE 30
697 static struct tpm_input_header pcrread_header = {
698 .tag = TPM_TAG_RQU_COMMAND,
699 .length = cpu_to_be32(14),
700 .ordinal = TPM_ORDINAL_PCRREAD
701 };
702
703 int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf)
704 {
705 int rc;
706 struct tpm_cmd_t cmd;
707
708 cmd.header.in = pcrread_header;
709 cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx);
710 rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE,
711 "attempting to read a pcr value");
712
713 if (rc == 0)
714 memcpy(res_buf, cmd.params.pcrread_out.pcr_result,
715 TPM_DIGEST_SIZE);
716 return rc;
717 }
718
719 /**
720 * tpm_pcr_read - read a pcr value
721 * @chip_num: tpm idx # or ANY
722 * @pcr_idx: pcr idx to retrieve
723 * @res_buf: TPM_PCR value
724 * size of res_buf is 20 bytes (or NULL if you don't care)
725 *
726 * The TPM driver should be built-in, but for whatever reason it
727 * isn't, protect against the chip disappearing, by incrementing
728 * the module usage count.
729 */
730 int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf)
731 {
732 struct tpm_chip *chip;
733 int rc;
734
735 chip = tpm_chip_find_get(chip_num);
736 if (chip == NULL)
737 return -ENODEV;
738 rc = __tpm_pcr_read(chip, pcr_idx, res_buf);
739 tpm_chip_put(chip);
740 return rc;
741 }
742 EXPORT_SYMBOL_GPL(tpm_pcr_read);
743
744 /**
745 * tpm_pcr_extend - extend pcr value with hash
746 * @chip_num: tpm idx # or AN&
747 * @pcr_idx: pcr idx to extend
748 * @hash: hash value used to extend pcr value
749 *
750 * The TPM driver should be built-in, but for whatever reason it
751 * isn't, protect against the chip disappearing, by incrementing
752 * the module usage count.
753 */
754 #define TPM_ORD_PCR_EXTEND cpu_to_be32(20)
755 #define EXTEND_PCR_RESULT_SIZE 34
756 static struct tpm_input_header pcrextend_header = {
757 .tag = TPM_TAG_RQU_COMMAND,
758 .length = cpu_to_be32(34),
759 .ordinal = TPM_ORD_PCR_EXTEND
760 };
761
762 int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash)
763 {
764 struct tpm_cmd_t cmd;
765 int rc;
766 struct tpm_chip *chip;
767
768 chip = tpm_chip_find_get(chip_num);
769 if (chip == NULL)
770 return -ENODEV;
771
772 cmd.header.in = pcrextend_header;
773 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx);
774 memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE);
775 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
776 "attempting extend a PCR value");
777
778 tpm_chip_put(chip);
779 return rc;
780 }
781 EXPORT_SYMBOL_GPL(tpm_pcr_extend);
782
783 int tpm_send(u32 chip_num, void *cmd, size_t buflen)
784 {
785 struct tpm_chip *chip;
786 int rc;
787
788 chip = tpm_chip_find_get(chip_num);
789 if (chip == NULL)
790 return -ENODEV;
791
792 rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd");
793
794 tpm_chip_put(chip);
795 return rc;
796 }
797 EXPORT_SYMBOL_GPL(tpm_send);
798
799 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
800 char *buf)
801 {
802 cap_t cap;
803 u8 digest[TPM_DIGEST_SIZE];
804 ssize_t rc;
805 int i, j, num_pcrs;
806 char *str = buf;
807 struct tpm_chip *chip = dev_get_drvdata(dev);
808
809 rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
810 "attempting to determine the number of PCRS");
811 if (rc)
812 return 0;
813
814 num_pcrs = be32_to_cpu(cap.num_pcrs);
815 for (i = 0; i < num_pcrs; i++) {
816 rc = __tpm_pcr_read(chip, i, digest);
817 if (rc)
818 break;
819 str += sprintf(str, "PCR-%02d: ", i);
820 for (j = 0; j < TPM_DIGEST_SIZE; j++)
821 str += sprintf(str, "%02X ", digest[j]);
822 str += sprintf(str, "\n");
823 }
824 return str - buf;
825 }
826 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
827
828 #define READ_PUBEK_RESULT_SIZE 314
829 #define TPM_ORD_READPUBEK cpu_to_be32(124)
830 struct tpm_input_header tpm_readpubek_header = {
831 .tag = TPM_TAG_RQU_COMMAND,
832 .length = cpu_to_be32(30),
833 .ordinal = TPM_ORD_READPUBEK
834 };
835
836 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
837 char *buf)
838 {
839 u8 *data;
840 struct tpm_cmd_t tpm_cmd;
841 ssize_t err;
842 int i, rc;
843 char *str = buf;
844
845 struct tpm_chip *chip = dev_get_drvdata(dev);
846
847 tpm_cmd.header.in = tpm_readpubek_header;
848 err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
849 "attempting to read the PUBEK");
850 if (err)
851 goto out;
852
853 /*
854 ignore header 10 bytes
855 algorithm 32 bits (1 == RSA )
856 encscheme 16 bits
857 sigscheme 16 bits
858 parameters (RSA 12->bytes: keybit, #primes, expbit)
859 keylenbytes 32 bits
860 256 byte modulus
861 ignore checksum 20 bytes
862 */
863 data = tpm_cmd.params.readpubek_out_buffer;
864 str +=
865 sprintf(str,
866 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
867 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
868 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
869 "Modulus length: %d\nModulus: \n",
870 data[10], data[11], data[12], data[13], data[14],
871 data[15], data[16], data[17], data[22], data[23],
872 data[24], data[25], data[26], data[27], data[28],
873 data[29], data[30], data[31], data[32], data[33],
874 be32_to_cpu(*((__be32 *) (data + 34))));
875
876 for (i = 0; i < 256; i++) {
877 str += sprintf(str, "%02X ", data[i + 38]);
878 if ((i + 1) % 16 == 0)
879 str += sprintf(str, "\n");
880 }
881 out:
882 rc = str - buf;
883 return rc;
884 }
885 EXPORT_SYMBOL_GPL(tpm_show_pubek);
886
887
888 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
889 char *buf)
890 {
891 cap_t cap;
892 ssize_t rc;
893 char *str = buf;
894
895 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
896 "attempting to determine the manufacturer");
897 if (rc)
898 return 0;
899 str += sprintf(str, "Manufacturer: 0x%x\n",
900 be32_to_cpu(cap.manufacturer_id));
901
902 rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap,
903 "attempting to determine the 1.1 version");
904 if (rc)
905 return 0;
906 str += sprintf(str,
907 "TCG version: %d.%d\nFirmware version: %d.%d\n",
908 cap.tpm_version.Major, cap.tpm_version.Minor,
909 cap.tpm_version.revMajor, cap.tpm_version.revMinor);
910 return str - buf;
911 }
912 EXPORT_SYMBOL_GPL(tpm_show_caps);
913
914 ssize_t tpm_show_caps_1_2(struct device * dev,
915 struct device_attribute * attr, char *buf)
916 {
917 cap_t cap;
918 ssize_t rc;
919 char *str = buf;
920
921 rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap,
922 "attempting to determine the manufacturer");
923 if (rc)
924 return 0;
925 str += sprintf(str, "Manufacturer: 0x%x\n",
926 be32_to_cpu(cap.manufacturer_id));
927 rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap,
928 "attempting to determine the 1.2 version");
929 if (rc)
930 return 0;
931 str += sprintf(str,
932 "TCG version: %d.%d\nFirmware version: %d.%d\n",
933 cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor,
934 cap.tpm_version_1_2.revMajor,
935 cap.tpm_version_1_2.revMinor);
936 return str - buf;
937 }
938 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
939
940 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
941 const char *buf, size_t count)
942 {
943 struct tpm_chip *chip = dev_get_drvdata(dev);
944 if (chip == NULL)
945 return 0;
946
947 chip->vendor.cancel(chip);
948 return count;
949 }
950 EXPORT_SYMBOL_GPL(tpm_store_cancel);
951
952 /*
953 * Device file system interface to the TPM
954 *
955 * It's assured that the chip will be opened just once,
956 * by the check of is_open variable, which is protected
957 * by driver_lock.
958 */
959 int tpm_open(struct inode *inode, struct file *file)
960 {
961 int minor = iminor(inode);
962 struct tpm_chip *chip = NULL, *pos;
963
964 rcu_read_lock();
965 list_for_each_entry_rcu(pos, &tpm_chip_list, list) {
966 if (pos->vendor.miscdev.minor == minor) {
967 chip = pos;
968 get_device(chip->dev);
969 break;
970 }
971 }
972 rcu_read_unlock();
973
974 if (!chip)
975 return -ENODEV;
976
977 if (test_and_set_bit(0, &chip->is_open)) {
978 dev_dbg(chip->dev, "Another process owns this TPM\n");
979 put_device(chip->dev);
980 return -EBUSY;
981 }
982
983 chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL);
984 if (chip->data_buffer == NULL) {
985 clear_bit(0, &chip->is_open);
986 put_device(chip->dev);
987 return -ENOMEM;
988 }
989
990 atomic_set(&chip->data_pending, 0);
991
992 file->private_data = chip;
993 return 0;
994 }
995 EXPORT_SYMBOL_GPL(tpm_open);
996
997 /*
998 * Called on file close
999 */
1000 int tpm_release(struct inode *inode, struct file *file)
1001 {
1002 struct tpm_chip *chip = file->private_data;
1003
1004 del_singleshot_timer_sync(&chip->user_read_timer);
1005 flush_work_sync(&chip->work);
1006 file->private_data = NULL;
1007 atomic_set(&chip->data_pending, 0);
1008 kfree(chip->data_buffer);
1009 clear_bit(0, &chip->is_open);
1010 put_device(chip->dev);
1011 return 0;
1012 }
1013 EXPORT_SYMBOL_GPL(tpm_release);
1014
1015 ssize_t tpm_write(struct file *file, const char __user *buf,
1016 size_t size, loff_t *off)
1017 {
1018 struct tpm_chip *chip = file->private_data;
1019 size_t in_size = size, out_size;
1020
1021 /* cannot perform a write until the read has cleared
1022 either via tpm_read or a user_read_timer timeout */
1023 while (atomic_read(&chip->data_pending) != 0)
1024 msleep(TPM_TIMEOUT);
1025
1026 mutex_lock(&chip->buffer_mutex);
1027
1028 if (in_size > TPM_BUFSIZE)
1029 in_size = TPM_BUFSIZE;
1030
1031 if (copy_from_user
1032 (chip->data_buffer, (void __user *) buf, in_size)) {
1033 mutex_unlock(&chip->buffer_mutex);
1034 return -EFAULT;
1035 }
1036
1037 /* atomic tpm command send and result receive */
1038 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1039
1040 atomic_set(&chip->data_pending, out_size);
1041 mutex_unlock(&chip->buffer_mutex);
1042
1043 /* Set a timeout by which the reader must come claim the result */
1044 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1045
1046 return in_size;
1047 }
1048 EXPORT_SYMBOL_GPL(tpm_write);
1049
1050 ssize_t tpm_read(struct file *file, char __user *buf,
1051 size_t size, loff_t *off)
1052 {
1053 struct tpm_chip *chip = file->private_data;
1054 ssize_t ret_size;
1055
1056 del_singleshot_timer_sync(&chip->user_read_timer);
1057 flush_work_sync(&chip->work);
1058 ret_size = atomic_read(&chip->data_pending);
1059 atomic_set(&chip->data_pending, 0);
1060 if (ret_size > 0) { /* relay data */
1061 if (size < ret_size)
1062 ret_size = size;
1063
1064 mutex_lock(&chip->buffer_mutex);
1065 if (copy_to_user(buf, chip->data_buffer, ret_size))
1066 ret_size = -EFAULT;
1067 mutex_unlock(&chip->buffer_mutex);
1068 }
1069
1070 return ret_size;
1071 }
1072 EXPORT_SYMBOL_GPL(tpm_read);
1073
1074 void tpm_remove_hardware(struct device *dev)
1075 {
1076 struct tpm_chip *chip = dev_get_drvdata(dev);
1077
1078 if (chip == NULL) {
1079 dev_err(dev, "No device data found\n");
1080 return;
1081 }
1082
1083 spin_lock(&driver_lock);
1084 list_del_rcu(&chip->list);
1085 spin_unlock(&driver_lock);
1086 synchronize_rcu();
1087
1088 misc_deregister(&chip->vendor.miscdev);
1089 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1090 tpm_bios_log_teardown(chip->bios_dir);
1091
1092 /* write it this way to be explicit (chip->dev == dev) */
1093 put_device(chip->dev);
1094 }
1095 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1096
1097 #define TPM_ORD_SAVESTATE cpu_to_be32(152)
1098 #define SAVESTATE_RESULT_SIZE 10
1099
1100 static struct tpm_input_header savestate_header = {
1101 .tag = TPM_TAG_RQU_COMMAND,
1102 .length = cpu_to_be32(10),
1103 .ordinal = TPM_ORD_SAVESTATE
1104 };
1105
1106 /*
1107 * We are about to suspend. Save the TPM state
1108 * so that it can be restored.
1109 */
1110 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1111 {
1112 struct tpm_chip *chip = dev_get_drvdata(dev);
1113 struct tpm_cmd_t cmd;
1114 int rc;
1115
1116 u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
1117
1118 if (chip == NULL)
1119 return -ENODEV;
1120
1121 /* for buggy tpm, flush pcrs with extend to selected dummy */
1122 if (tpm_suspend_pcr) {
1123 cmd.header.in = pcrextend_header;
1124 cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr);
1125 memcpy(cmd.params.pcrextend_in.hash, dummy_hash,
1126 TPM_DIGEST_SIZE);
1127 rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE,
1128 "extending dummy pcr before suspend");
1129 }
1130
1131 /* now do the actual savestate */
1132 cmd.header.in = savestate_header;
1133 rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE,
1134 "sending savestate before suspend");
1135 return rc;
1136 }
1137 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1138
1139 /*
1140 * Resume from a power safe. The BIOS already restored
1141 * the TPM state.
1142 */
1143 int tpm_pm_resume(struct device *dev)
1144 {
1145 struct tpm_chip *chip = dev_get_drvdata(dev);
1146
1147 if (chip == NULL)
1148 return -ENODEV;
1149
1150 return 0;
1151 }
1152 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1153
1154 /* In case vendor provided release function, call it too.*/
1155
1156 void tpm_dev_vendor_release(struct tpm_chip *chip)
1157 {
1158 if (chip->vendor.release)
1159 chip->vendor.release(chip->dev);
1160
1161 clear_bit(chip->dev_num, dev_mask);
1162 kfree(chip->vendor.miscdev.name);
1163 }
1164 EXPORT_SYMBOL_GPL(tpm_dev_vendor_release);
1165
1166
1167 /*
1168 * Once all references to platform device are down to 0,
1169 * release all allocated structures.
1170 */
1171 void tpm_dev_release(struct device *dev)
1172 {
1173 struct tpm_chip *chip = dev_get_drvdata(dev);
1174
1175 tpm_dev_vendor_release(chip);
1176
1177 chip->release(dev);
1178 kfree(chip);
1179 }
1180 EXPORT_SYMBOL_GPL(tpm_dev_release);
1181
1182 /*
1183 * Called from tpm_<specific>.c probe function only for devices
1184 * the driver has determined it should claim. Prior to calling
1185 * this function the specific probe function has called pci_enable_device
1186 * upon errant exit from this function specific probe function should call
1187 * pci_disable_device
1188 */
1189 struct tpm_chip *tpm_register_hardware(struct device *dev,
1190 const struct tpm_vendor_specific *entry)
1191 {
1192 #define DEVNAME_SIZE 7
1193
1194 char *devname;
1195 struct tpm_chip *chip;
1196
1197 /* Driver specific per-device data */
1198 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1199 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1200
1201 if (chip == NULL || devname == NULL)
1202 goto out_free;
1203
1204 mutex_init(&chip->buffer_mutex);
1205 mutex_init(&chip->tpm_mutex);
1206 INIT_LIST_HEAD(&chip->list);
1207
1208 INIT_WORK(&chip->work, timeout_work);
1209
1210 setup_timer(&chip->user_read_timer, user_reader_timeout,
1211 (unsigned long)chip);
1212
1213 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1214
1215 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1216
1217 if (chip->dev_num >= TPM_NUM_DEVICES) {
1218 dev_err(dev, "No available tpm device numbers\n");
1219 goto out_free;
1220 } else if (chip->dev_num == 0)
1221 chip->vendor.miscdev.minor = TPM_MINOR;
1222 else
1223 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1224
1225 set_bit(chip->dev_num, dev_mask);
1226
1227 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1228 chip->vendor.miscdev.name = devname;
1229
1230 chip->vendor.miscdev.parent = dev;
1231 chip->dev = get_device(dev);
1232 chip->release = dev->release;
1233 dev->release = tpm_dev_release;
1234 dev_set_drvdata(dev, chip);
1235
1236 if (misc_register(&chip->vendor.miscdev)) {
1237 dev_err(chip->dev,
1238 "unable to misc_register %s, minor %d\n",
1239 chip->vendor.miscdev.name,
1240 chip->vendor.miscdev.minor);
1241 put_device(chip->dev);
1242 return NULL;
1243 }
1244
1245 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1246 misc_deregister(&chip->vendor.miscdev);
1247 put_device(chip->dev);
1248
1249 return NULL;
1250 }
1251
1252 chip->bios_dir = tpm_bios_log_setup(devname);
1253
1254 /* Make chip available */
1255 spin_lock(&driver_lock);
1256 list_add_rcu(&chip->list, &tpm_chip_list);
1257 spin_unlock(&driver_lock);
1258
1259 return chip;
1260
1261 out_free:
1262 kfree(chip);
1263 kfree(devname);
1264 return NULL;
1265 }
1266 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1267
1268 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1269 MODULE_DESCRIPTION("TPM Driver");
1270 MODULE_VERSION("2.0");
1271 MODULE_LICENSE("GPL");
linux-next