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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / char / tpm / tpm.c
bloba5d8bcb40000df912d43cb9ad4a8cc9c7453642c
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/mutex.h>
28 #include <linux/spinlock.h>
29
30 #include "tpm.h"
31
32 enum tpm_const {
33 TPM_MINOR = 224, /* officially assigned */
34 TPM_BUFSIZE = 2048,
35 TPM_NUM_DEVICES = 256,
36 };
37
38 enum tpm_duration {
39 TPM_SHORT = 0,
40 TPM_MEDIUM = 1,
41 TPM_LONG = 2,
42 TPM_UNDEFINED,
43 };
44
45 #define TPM_MAX_ORDINAL 243
46 #define TPM_MAX_PROTECTED_ORDINAL 12
47 #define TPM_PROTECTED_ORDINAL_MASK 0xFF
48
49 static LIST_HEAD(tpm_chip_list);
50 static DEFINE_SPINLOCK(driver_lock);
51 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
52
53 /*
54 * Array with one entry per ordinal defining the maximum amount
55 * of time the chip could take to return the result. The ordinal
56 * designation of short, medium or long is defined in a table in
57 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
58 * values of the SHORT, MEDIUM, and LONG durations are retrieved
59 * from the chip during initialization with a call to tpm_get_timeouts.
60 */
61 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
62 TPM_UNDEFINED, /* 0 */
63 TPM_UNDEFINED,
64 TPM_UNDEFINED,
65 TPM_UNDEFINED,
66 TPM_UNDEFINED,
67 TPM_UNDEFINED, /* 5 */
68 TPM_UNDEFINED,
69 TPM_UNDEFINED,
70 TPM_UNDEFINED,
71 TPM_UNDEFINED,
72 TPM_SHORT, /* 10 */
73 TPM_SHORT,
74 };
75
76 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
77 TPM_UNDEFINED, /* 0 */
78 TPM_UNDEFINED,
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED,
82 TPM_UNDEFINED, /* 5 */
83 TPM_UNDEFINED,
84 TPM_UNDEFINED,
85 TPM_UNDEFINED,
86 TPM_UNDEFINED,
87 TPM_SHORT, /* 10 */
88 TPM_SHORT,
89 TPM_MEDIUM,
90 TPM_LONG,
91 TPM_LONG,
92 TPM_MEDIUM, /* 15 */
93 TPM_SHORT,
94 TPM_SHORT,
95 TPM_MEDIUM,
96 TPM_LONG,
97 TPM_SHORT, /* 20 */
98 TPM_SHORT,
99 TPM_MEDIUM,
100 TPM_MEDIUM,
101 TPM_MEDIUM,
102 TPM_SHORT, /* 25 */
103 TPM_SHORT,
104 TPM_MEDIUM,
105 TPM_SHORT,
106 TPM_SHORT,
107 TPM_MEDIUM, /* 30 */
108 TPM_LONG,
109 TPM_MEDIUM,
110 TPM_SHORT,
111 TPM_SHORT,
112 TPM_SHORT, /* 35 */
113 TPM_MEDIUM,
114 TPM_MEDIUM,
115 TPM_UNDEFINED,
116 TPM_UNDEFINED,
117 TPM_MEDIUM, /* 40 */
118 TPM_LONG,
119 TPM_MEDIUM,
120 TPM_SHORT,
121 TPM_SHORT,
122 TPM_SHORT, /* 45 */
123 TPM_SHORT,
124 TPM_SHORT,
125 TPM_SHORT,
126 TPM_LONG,
127 TPM_MEDIUM, /* 50 */
128 TPM_MEDIUM,
129 TPM_UNDEFINED,
130 TPM_UNDEFINED,
131 TPM_UNDEFINED,
132 TPM_UNDEFINED, /* 55 */
133 TPM_UNDEFINED,
134 TPM_UNDEFINED,
135 TPM_UNDEFINED,
136 TPM_UNDEFINED,
137 TPM_MEDIUM, /* 60 */
138 TPM_MEDIUM,
139 TPM_MEDIUM,
140 TPM_SHORT,
141 TPM_SHORT,
142 TPM_MEDIUM, /* 65 */
143 TPM_UNDEFINED,
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_UNDEFINED,
147 TPM_SHORT, /* 70 */
148 TPM_SHORT,
149 TPM_UNDEFINED,
150 TPM_UNDEFINED,
151 TPM_UNDEFINED,
152 TPM_UNDEFINED, /* 75 */
153 TPM_UNDEFINED,
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_UNDEFINED,
157 TPM_LONG, /* 80 */
158 TPM_UNDEFINED,
159 TPM_MEDIUM,
160 TPM_LONG,
161 TPM_SHORT,
162 TPM_UNDEFINED, /* 85 */
163 TPM_UNDEFINED,
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_UNDEFINED,
167 TPM_SHORT, /* 90 */
168 TPM_SHORT,
169 TPM_SHORT,
170 TPM_SHORT,
171 TPM_SHORT,
172 TPM_UNDEFINED, /* 95 */
173 TPM_UNDEFINED,
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_UNDEFINED,
177 TPM_MEDIUM, /* 100 */
178 TPM_SHORT,
179 TPM_SHORT,
180 TPM_UNDEFINED,
181 TPM_UNDEFINED,
182 TPM_UNDEFINED, /* 105 */
183 TPM_UNDEFINED,
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_UNDEFINED,
187 TPM_SHORT, /* 110 */
188 TPM_SHORT,
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_SHORT,
192 TPM_SHORT, /* 115 */
193 TPM_SHORT,
194 TPM_SHORT,
195 TPM_UNDEFINED,
196 TPM_UNDEFINED,
197 TPM_LONG, /* 120 */
198 TPM_LONG,
199 TPM_MEDIUM,
200 TPM_UNDEFINED,
201 TPM_SHORT,
202 TPM_SHORT, /* 125 */
203 TPM_SHORT,
204 TPM_LONG,
205 TPM_SHORT,
206 TPM_SHORT,
207 TPM_SHORT, /* 130 */
208 TPM_MEDIUM,
209 TPM_UNDEFINED,
210 TPM_SHORT,
211 TPM_MEDIUM,
212 TPM_UNDEFINED, /* 135 */
213 TPM_UNDEFINED,
214 TPM_UNDEFINED,
215 TPM_UNDEFINED,
216 TPM_UNDEFINED,
217 TPM_SHORT, /* 140 */
218 TPM_SHORT,
219 TPM_UNDEFINED,
220 TPM_UNDEFINED,
221 TPM_UNDEFINED,
222 TPM_UNDEFINED, /* 145 */
223 TPM_UNDEFINED,
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_UNDEFINED,
227 TPM_SHORT, /* 150 */
228 TPM_MEDIUM,
229 TPM_MEDIUM,
230 TPM_SHORT,
231 TPM_SHORT,
232 TPM_UNDEFINED, /* 155 */
233 TPM_UNDEFINED,
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_UNDEFINED,
237 TPM_SHORT, /* 160 */
238 TPM_SHORT,
239 TPM_SHORT,
240 TPM_SHORT,
241 TPM_UNDEFINED,
242 TPM_UNDEFINED, /* 165 */
243 TPM_UNDEFINED,
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_UNDEFINED,
247 TPM_LONG, /* 170 */
248 TPM_UNDEFINED,
249 TPM_UNDEFINED,
250 TPM_UNDEFINED,
251 TPM_UNDEFINED,
252 TPM_UNDEFINED, /* 175 */
253 TPM_UNDEFINED,
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_MEDIUM, /* 180 */
258 TPM_SHORT,
259 TPM_MEDIUM,
260 TPM_MEDIUM,
261 TPM_MEDIUM,
262 TPM_MEDIUM, /* 185 */
263 TPM_SHORT,
264 TPM_UNDEFINED,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED,
267 TPM_UNDEFINED, /* 190 */
268 TPM_UNDEFINED,
269 TPM_UNDEFINED,
270 TPM_UNDEFINED,
271 TPM_UNDEFINED,
272 TPM_UNDEFINED, /* 195 */
273 TPM_UNDEFINED,
274 TPM_UNDEFINED,
275 TPM_UNDEFINED,
276 TPM_UNDEFINED,
277 TPM_SHORT, /* 200 */
278 TPM_UNDEFINED,
279 TPM_UNDEFINED,
280 TPM_UNDEFINED,
281 TPM_SHORT,
282 TPM_SHORT, /* 205 */
283 TPM_SHORT,
284 TPM_SHORT,
285 TPM_SHORT,
286 TPM_SHORT,
287 TPM_MEDIUM, /* 210 */
288 TPM_UNDEFINED,
289 TPM_MEDIUM,
290 TPM_MEDIUM,
291 TPM_MEDIUM,
292 TPM_UNDEFINED, /* 215 */
293 TPM_MEDIUM,
294 TPM_UNDEFINED,
295 TPM_UNDEFINED,
296 TPM_SHORT,
297 TPM_SHORT, /* 220 */
298 TPM_SHORT,
299 TPM_SHORT,
300 TPM_SHORT,
301 TPM_SHORT,
302 TPM_UNDEFINED, /* 225 */
303 TPM_UNDEFINED,
304 TPM_UNDEFINED,
305 TPM_UNDEFINED,
306 TPM_UNDEFINED,
307 TPM_SHORT, /* 230 */
308 TPM_LONG,
309 TPM_MEDIUM,
310 TPM_UNDEFINED,
311 TPM_UNDEFINED,
312 TPM_UNDEFINED, /* 235 */
313 TPM_UNDEFINED,
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_UNDEFINED,
317 TPM_SHORT, /* 240 */
318 TPM_UNDEFINED,
319 TPM_MEDIUM,
320 };
321
322 static void user_reader_timeout(unsigned long ptr)
323 {
324 struct tpm_chip *chip = (struct tpm_chip *) ptr;
325
326 schedule_work(&chip->work);
327 }
328
329 static void timeout_work(struct work_struct *work)
330 {
331 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
332
333 mutex_lock(&chip->buffer_mutex);
334 atomic_set(&chip->data_pending, 0);
335 memset(chip->data_buffer, 0, TPM_BUFSIZE);
336 mutex_unlock(&chip->buffer_mutex);
337 }
338
339 /*
340 * Returns max number of jiffies to wait
341 */
342 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
343 u32 ordinal)
344 {
345 int duration_idx = TPM_UNDEFINED;
346 int duration = 0;
347
348 if (ordinal < TPM_MAX_ORDINAL)
349 duration_idx = tpm_ordinal_duration[ordinal];
350 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
351 TPM_MAX_PROTECTED_ORDINAL)
352 duration_idx =
353 tpm_protected_ordinal_duration[ordinal &
354 TPM_PROTECTED_ORDINAL_MASK];
355
356 if (duration_idx != TPM_UNDEFINED)
357 duration = chip->vendor.duration[duration_idx];
358 if (duration <= 0)
359 return 2 * 60 * HZ;
360 else
361 return duration;
362 }
363 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
364
365 /*
366 * Internal kernel interface to transmit TPM commands
367 */
368 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
369 size_t bufsiz)
370 {
371 ssize_t rc;
372 u32 count, ordinal;
373 unsigned long stop;
374
375 count = be32_to_cpu(*((__be32 *) (buf + 2)));
376 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
377 if (count == 0)
378 return -ENODATA;
379 if (count > bufsiz) {
380 dev_err(chip->dev,
381 "invalid count value %x %zx \n", count, bufsiz);
382 return -E2BIG;
383 }
384
385 mutex_lock(&chip->tpm_mutex);
386
387 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
388 dev_err(chip->dev,
389 "tpm_transmit: tpm_send: error %zd\n", rc);
390 goto out;
391 }
392
393 if (chip->vendor.irq)
394 goto out_recv;
395
396 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
397 do {
398 u8 status = chip->vendor.status(chip);
399 if ((status & chip->vendor.req_complete_mask) ==
400 chip->vendor.req_complete_val)
401 goto out_recv;
402
403 if ((status == chip->vendor.req_canceled)) {
404 dev_err(chip->dev, "Operation Canceled\n");
405 rc = -ECANCELED;
406 goto out;
407 }
408
409 msleep(TPM_TIMEOUT); /* CHECK */
410 rmb();
411 } while (time_before(jiffies, stop));
412
413 chip->vendor.cancel(chip);
414 dev_err(chip->dev, "Operation Timed out\n");
415 rc = -ETIME;
416 goto out;
417
418 out_recv:
419 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
420 if (rc < 0)
421 dev_err(chip->dev,
422 "tpm_transmit: tpm_recv: error %zd\n", rc);
423 out:
424 mutex_unlock(&chip->tpm_mutex);
425 return rc;
426 }
427
428 #define TPM_DIGEST_SIZE 20
429 #define TPM_ERROR_SIZE 10
430 #define TPM_RET_CODE_IDX 6
431 #define TPM_GET_CAP_RET_SIZE_IDX 10
432 #define TPM_GET_CAP_RET_UINT32_1_IDX 14
433 #define TPM_GET_CAP_RET_UINT32_2_IDX 18
434 #define TPM_GET_CAP_RET_UINT32_3_IDX 22
435 #define TPM_GET_CAP_RET_UINT32_4_IDX 26
436 #define TPM_GET_CAP_PERM_DISABLE_IDX 16
437 #define TPM_GET_CAP_PERM_INACTIVE_IDX 18
438 #define TPM_GET_CAP_RET_BOOL_1_IDX 14
439 #define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
440
441 #define TPM_CAP_IDX 13
442 #define TPM_CAP_SUBCAP_IDX 21
443
444 enum tpm_capabilities {
445 TPM_CAP_FLAG = 4,
446 TPM_CAP_PROP = 5,
447 };
448
449 enum tpm_sub_capabilities {
450 TPM_CAP_PROP_PCR = 0x1,
451 TPM_CAP_PROP_MANUFACTURER = 0x3,
452 TPM_CAP_FLAG_PERM = 0x8,
453 TPM_CAP_FLAG_VOL = 0x9,
454 TPM_CAP_PROP_OWNER = 0x11,
455 TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
456 TPM_CAP_PROP_TIS_DURATION = 0x20,
457 };
458
459 /*
460 * This is a semi generic GetCapability command for use
461 * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
462 * and their associated sub_capabilities.
463 */
464
465 static const u8 tpm_cap[] = {
466 0, 193, /* TPM_TAG_RQU_COMMAND */
467 0, 0, 0, 22, /* length */
468 0, 0, 0, 101, /* TPM_ORD_GetCapability */
469 0, 0, 0, 0, /* TPM_CAP_<TYPE> */
470 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
471 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
472 };
473
474 static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
475 char *desc)
476 {
477 int err;
478
479 len = tpm_transmit(chip, data, len);
480 if (len < 0)
481 return len;
482 if (len == TPM_ERROR_SIZE) {
483 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
484 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
485 return err;
486 }
487 return 0;
488 }
489
490 void tpm_gen_interrupt(struct tpm_chip *chip)
491 {
492 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
493 ssize_t rc;
494
495 memcpy(data, tpm_cap, sizeof(tpm_cap));
496 data[TPM_CAP_IDX] = TPM_CAP_PROP;
497 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
498
499 rc = transmit_cmd(chip, data, sizeof(data),
500 "attempting to determine the timeouts");
501 }
502 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
503
504 void tpm_get_timeouts(struct tpm_chip *chip)
505 {
506 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
507 ssize_t rc;
508 u32 timeout;
509
510 memcpy(data, tpm_cap, sizeof(tpm_cap));
511 data[TPM_CAP_IDX] = TPM_CAP_PROP;
512 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
513
514 rc = transmit_cmd(chip, data, sizeof(data),
515 "attempting to determine the timeouts");
516 if (rc)
517 goto duration;
518
519 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
520 != 4 * sizeof(u32))
521 goto duration;
522
523 /* Don't overwrite default if value is 0 */
524 timeout =
525 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
526 if (timeout)
527 chip->vendor.timeout_a = msecs_to_jiffies(timeout);
528 timeout =
529 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
530 if (timeout)
531 chip->vendor.timeout_b = msecs_to_jiffies(timeout);
532 timeout =
533 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
534 if (timeout)
535 chip->vendor.timeout_c = msecs_to_jiffies(timeout);
536 timeout =
537 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
538 if (timeout)
539 chip->vendor.timeout_d = msecs_to_jiffies(timeout);
540
541 duration:
542 memcpy(data, tpm_cap, sizeof(tpm_cap));
543 data[TPM_CAP_IDX] = TPM_CAP_PROP;
544 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
545
546 rc = transmit_cmd(chip, data, sizeof(data),
547 "attempting to determine the durations");
548 if (rc)
549 return;
550
551 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
552 != 3 * sizeof(u32))
553 return;
554
555 chip->vendor.duration[TPM_SHORT] =
556 msecs_to_jiffies(be32_to_cpu
557 (*((__be32 *) (data +
558 TPM_GET_CAP_RET_UINT32_1_IDX))));
559 chip->vendor.duration[TPM_MEDIUM] =
560 msecs_to_jiffies(be32_to_cpu
561 (*((__be32 *) (data +
562 TPM_GET_CAP_RET_UINT32_2_IDX))));
563 chip->vendor.duration[TPM_LONG] =
564 msecs_to_jiffies(be32_to_cpu
565 (*((__be32 *) (data +
566 TPM_GET_CAP_RET_UINT32_3_IDX))));
567 }
568 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
569
570 void tpm_continue_selftest(struct tpm_chip *chip)
571 {
572 u8 data[] = {
573 0, 193, /* TPM_TAG_RQU_COMMAND */
574 0, 0, 0, 10, /* length */
575 0, 0, 0, 83, /* TPM_ORD_GetCapability */
576 };
577
578 tpm_transmit(chip, data, sizeof(data));
579 }
580 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
581
582 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
583 char *buf)
584 {
585 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
586 ssize_t rc;
587
588 struct tpm_chip *chip = dev_get_drvdata(dev);
589 if (chip == NULL)
590 return -ENODEV;
591
592 memcpy(data, tpm_cap, sizeof(tpm_cap));
593 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
594 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
595
596 rc = transmit_cmd(chip, data, sizeof(data),
597 "attemtping to determine the permanent state");
598 if (rc)
599 return 0;
600 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
601 }
602 EXPORT_SYMBOL_GPL(tpm_show_enabled);
603
604 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
605 char *buf)
606 {
607 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 35)];
608 ssize_t rc;
609
610 struct tpm_chip *chip = dev_get_drvdata(dev);
611 if (chip == NULL)
612 return -ENODEV;
613
614 memcpy(data, tpm_cap, sizeof(tpm_cap));
615 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
616 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
617
618 rc = transmit_cmd(chip, data, sizeof(data),
619 "attemtping to determine the permanent state");
620 if (rc)
621 return 0;
622 return sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
623 }
624 EXPORT_SYMBOL_GPL(tpm_show_active);
625
626 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
627 char *buf)
628 {
629 u8 data[sizeof(tpm_cap)];
630 ssize_t rc;
631
632 struct tpm_chip *chip = dev_get_drvdata(dev);
633 if (chip == NULL)
634 return -ENODEV;
635
636 memcpy(data, tpm_cap, sizeof(tpm_cap));
637 data[TPM_CAP_IDX] = TPM_CAP_PROP;
638 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
639
640 rc = transmit_cmd(chip, data, sizeof(data),
641 "attempting to determine the owner state");
642 if (rc)
643 return 0;
644 return sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
645 }
646 EXPORT_SYMBOL_GPL(tpm_show_owned);
647
648 ssize_t tpm_show_temp_deactivated(struct device * dev,
649 struct device_attribute * attr, char *buf)
650 {
651 u8 data[sizeof(tpm_cap)];
652 ssize_t rc;
653
654 struct tpm_chip *chip = dev_get_drvdata(dev);
655 if (chip == NULL)
656 return -ENODEV;
657
658 memcpy(data, tpm_cap, sizeof(tpm_cap));
659 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
660 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
661
662 rc = transmit_cmd(chip, data, sizeof(data),
663 "attempting to determine the temporary state");
664 if (rc)
665 return 0;
666 return sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
667 }
668 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
669
670 static const u8 pcrread[] = {
671 0, 193, /* TPM_TAG_RQU_COMMAND */
672 0, 0, 0, 14, /* length */
673 0, 0, 0, 21, /* TPM_ORD_PcrRead */
674 0, 0, 0, 0 /* PCR index */
675 };
676
677 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
678 char *buf)
679 {
680 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(pcrread)), 30)];
681 ssize_t rc;
682 int i, j, num_pcrs;
683 __be32 index;
684 char *str = buf;
685
686 struct tpm_chip *chip = dev_get_drvdata(dev);
687 if (chip == NULL)
688 return -ENODEV;
689
690 memcpy(data, tpm_cap, sizeof(tpm_cap));
691 data[TPM_CAP_IDX] = TPM_CAP_PROP;
692 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
693
694 rc = transmit_cmd(chip, data, sizeof(data),
695 "attempting to determine the number of PCRS");
696 if (rc)
697 return 0;
698
699 num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
700 for (i = 0; i < num_pcrs; i++) {
701 memcpy(data, pcrread, sizeof(pcrread));
702 index = cpu_to_be32(i);
703 memcpy(data + 10, &index, 4);
704 rc = transmit_cmd(chip, data, sizeof(data),
705 "attempting to read a PCR");
706 if (rc)
707 goto out;
708 str += sprintf(str, "PCR-%02d: ", i);
709 for (j = 0; j < TPM_DIGEST_SIZE; j++)
710 str += sprintf(str, "%02X ", *(data + 10 + j));
711 str += sprintf(str, "\n");
712 }
713 out:
714 return str - buf;
715 }
716 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
717
718 #define READ_PUBEK_RESULT_SIZE 314
719 static const u8 readpubek[] = {
720 0, 193, /* TPM_TAG_RQU_COMMAND */
721 0, 0, 0, 30, /* length */
722 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
723 };
724
725 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
726 char *buf)
727 {
728 u8 *data;
729 ssize_t err;
730 int i, rc;
731 char *str = buf;
732
733 struct tpm_chip *chip = dev_get_drvdata(dev);
734 if (chip == NULL)
735 return -ENODEV;
736
737 data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
738 if (!data)
739 return -ENOMEM;
740
741 memcpy(data, readpubek, sizeof(readpubek));
742
743 err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
744 "attempting to read the PUBEK");
745 if (err)
746 goto out;
747
748 /*
749 ignore header 10 bytes
750 algorithm 32 bits (1 == RSA )
751 encscheme 16 bits
752 sigscheme 16 bits
753 parameters (RSA 12->bytes: keybit, #primes, expbit)
754 keylenbytes 32 bits
755 256 byte modulus
756 ignore checksum 20 bytes
757 */
758
759 str +=
760 sprintf(str,
761 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
762 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
763 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
764 "Modulus length: %d\nModulus: \n",
765 data[10], data[11], data[12], data[13], data[14],
766 data[15], data[16], data[17], data[22], data[23],
767 data[24], data[25], data[26], data[27], data[28],
768 data[29], data[30], data[31], data[32], data[33],
769 be32_to_cpu(*((__be32 *) (data + 34))));
770
771 for (i = 0; i < 256; i++) {
772 str += sprintf(str, "%02X ", data[i + 38]);
773 if ((i + 1) % 16 == 0)
774 str += sprintf(str, "\n");
775 }
776 out:
777 rc = str - buf;
778 kfree(data);
779 return rc;
780 }
781 EXPORT_SYMBOL_GPL(tpm_show_pubek);
782
783 #define CAP_VERSION_1_1 6
784 #define CAP_VERSION_1_2 0x1A
785 #define CAP_VERSION_IDX 13
786 static const u8 cap_version[] = {
787 0, 193, /* TPM_TAG_RQU_COMMAND */
788 0, 0, 0, 18, /* length */
789 0, 0, 0, 101, /* TPM_ORD_GetCapability */
790 0, 0, 0, 0,
791 0, 0, 0, 0
792 };
793
794 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
795 char *buf)
796 {
797 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
798 ssize_t rc;
799 char *str = buf;
800
801 struct tpm_chip *chip = dev_get_drvdata(dev);
802 if (chip == NULL)
803 return -ENODEV;
804
805 memcpy(data, tpm_cap, sizeof(tpm_cap));
806 data[TPM_CAP_IDX] = TPM_CAP_PROP;
807 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
808
809 rc = transmit_cmd(chip, data, sizeof(data),
810 "attempting to determine the manufacturer");
811 if (rc)
812 return 0;
813
814 str += sprintf(str, "Manufacturer: 0x%x\n",
815 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
816
817 memcpy(data, cap_version, sizeof(cap_version));
818 data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
819 rc = transmit_cmd(chip, data, sizeof(data),
820 "attempting to determine the 1.1 version");
821 if (rc)
822 goto out;
823
824 str += sprintf(str,
825 "TCG version: %d.%d\nFirmware version: %d.%d\n",
826 (int) data[14], (int) data[15], (int) data[16],
827 (int) data[17]);
828
829 out:
830 return str - buf;
831 }
832 EXPORT_SYMBOL_GPL(tpm_show_caps);
833
834 ssize_t tpm_show_caps_1_2(struct device * dev,
835 struct device_attribute * attr, char *buf)
836 {
837 u8 data[max_t(int, max(ARRAY_SIZE(tpm_cap), ARRAY_SIZE(cap_version)), 30)];
838 ssize_t len;
839 char *str = buf;
840
841 struct tpm_chip *chip = dev_get_drvdata(dev);
842 if (chip == NULL)
843 return -ENODEV;
844
845 memcpy(data, tpm_cap, sizeof(tpm_cap));
846 data[TPM_CAP_IDX] = TPM_CAP_PROP;
847 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
848
849 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
850 TPM_ERROR_SIZE) {
851 dev_dbg(chip->dev, "A TPM error (%d) occurred "
852 "attempting to determine the manufacturer\n",
853 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
854 return 0;
855 }
856
857 str += sprintf(str, "Manufacturer: 0x%x\n",
858 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
859
860 memcpy(data, cap_version, sizeof(cap_version));
861 data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
862
863 if ((len = tpm_transmit(chip, data, sizeof(data))) <=
864 TPM_ERROR_SIZE) {
865 dev_err(chip->dev, "A TPM error (%d) occurred "
866 "attempting to determine the 1.2 version\n",
867 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
868 goto out;
869 }
870 str += sprintf(str,
871 "TCG version: %d.%d\nFirmware version: %d.%d\n",
872 (int) data[16], (int) data[17], (int) data[18],
873 (int) data[19]);
874
875 out:
876 return str - buf;
877 }
878 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
879
880 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
881 const char *buf, size_t count)
882 {
883 struct tpm_chip *chip = dev_get_drvdata(dev);
884 if (chip == NULL)
885 return 0;
886
887 chip->vendor.cancel(chip);
888 return count;
889 }
890 EXPORT_SYMBOL_GPL(tpm_store_cancel);
891
892 /*
893 * Device file system interface to the TPM
894 */
895 int tpm_open(struct inode *inode, struct file *file)
896 {
897 int rc = 0, minor = iminor(inode);
898 struct tpm_chip *chip = NULL, *pos;
899
900 spin_lock(&driver_lock);
901
902 list_for_each_entry(pos, &tpm_chip_list, list) {
903 if (pos->vendor.miscdev.minor == minor) {
904 chip = pos;
905 break;
906 }
907 }
908
909 if (chip == NULL) {
910 rc = -ENODEV;
911 goto err_out;
912 }
913
914 if (chip->num_opens) {
915 dev_dbg(chip->dev, "Another process owns this TPM\n");
916 rc = -EBUSY;
917 goto err_out;
918 }
919
920 chip->num_opens++;
921 get_device(chip->dev);
922
923 spin_unlock(&driver_lock);
924
925 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
926 if (chip->data_buffer == NULL) {
927 chip->num_opens--;
928 put_device(chip->dev);
929 return -ENOMEM;
930 }
931
932 atomic_set(&chip->data_pending, 0);
933
934 file->private_data = chip;
935 return 0;
936
937 err_out:
938 spin_unlock(&driver_lock);
939 return rc;
940 }
941 EXPORT_SYMBOL_GPL(tpm_open);
942
943 int tpm_release(struct inode *inode, struct file *file)
944 {
945 struct tpm_chip *chip = file->private_data;
946
947 flush_scheduled_work();
948 spin_lock(&driver_lock);
949 file->private_data = NULL;
950 del_singleshot_timer_sync(&chip->user_read_timer);
951 atomic_set(&chip->data_pending, 0);
952 chip->num_opens--;
953 put_device(chip->dev);
954 kfree(chip->data_buffer);
955 spin_unlock(&driver_lock);
956 return 0;
957 }
958 EXPORT_SYMBOL_GPL(tpm_release);
959
960 ssize_t tpm_write(struct file *file, const char __user *buf,
961 size_t size, loff_t *off)
962 {
963 struct tpm_chip *chip = file->private_data;
964 int in_size = size, out_size;
965
966 /* cannot perform a write until the read has cleared
967 either via tpm_read or a user_read_timer timeout */
968 while (atomic_read(&chip->data_pending) != 0)
969 msleep(TPM_TIMEOUT);
970
971 mutex_lock(&chip->buffer_mutex);
972
973 if (in_size > TPM_BUFSIZE)
974 in_size = TPM_BUFSIZE;
975
976 if (copy_from_user
977 (chip->data_buffer, (void __user *) buf, in_size)) {
978 mutex_unlock(&chip->buffer_mutex);
979 return -EFAULT;
980 }
981
982 /* atomic tpm command send and result receive */
983 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
984
985 atomic_set(&chip->data_pending, out_size);
986 mutex_unlock(&chip->buffer_mutex);
987
988 /* Set a timeout by which the reader must come claim the result */
989 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
990
991 return in_size;
992 }
993 EXPORT_SYMBOL_GPL(tpm_write);
994
995 ssize_t tpm_read(struct file *file, char __user *buf,
996 size_t size, loff_t *off)
997 {
998 struct tpm_chip *chip = file->private_data;
999 int ret_size;
1000
1001 del_singleshot_timer_sync(&chip->user_read_timer);
1002 flush_scheduled_work();
1003 ret_size = atomic_read(&chip->data_pending);
1004 atomic_set(&chip->data_pending, 0);
1005 if (ret_size > 0) { /* relay data */
1006 if (size < ret_size)
1007 ret_size = size;
1008
1009 mutex_lock(&chip->buffer_mutex);
1010 if (copy_to_user(buf, chip->data_buffer, ret_size))
1011 ret_size = -EFAULT;
1012 mutex_unlock(&chip->buffer_mutex);
1013 }
1014
1015 return ret_size;
1016 }
1017 EXPORT_SYMBOL_GPL(tpm_read);
1018
1019 void tpm_remove_hardware(struct device *dev)
1020 {
1021 struct tpm_chip *chip = dev_get_drvdata(dev);
1022
1023 if (chip == NULL) {
1024 dev_err(dev, "No device data found\n");
1025 return;
1026 }
1027
1028 spin_lock(&driver_lock);
1029
1030 list_del(&chip->list);
1031
1032 spin_unlock(&driver_lock);
1033
1034 misc_deregister(&chip->vendor.miscdev);
1035
1036 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1037 tpm_bios_log_teardown(chip->bios_dir);
1038
1039 /* write it this way to be explicit (chip->dev == dev) */
1040 put_device(chip->dev);
1041 }
1042 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1043
1044 /*
1045 * We are about to suspend. Save the TPM state
1046 * so that it can be restored.
1047 */
1048 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1049 {
1050 struct tpm_chip *chip = dev_get_drvdata(dev);
1051 u8 savestate[] = {
1052 0, 193, /* TPM_TAG_RQU_COMMAND */
1053 0, 0, 0, 10, /* blob length (in bytes) */
1054 0, 0, 0, 152 /* TPM_ORD_SaveState */
1055 };
1056
1057 if (chip == NULL)
1058 return -ENODEV;
1059
1060 tpm_transmit(chip, savestate, sizeof(savestate));
1061 return 0;
1062 }
1063 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1064
1065 /*
1066 * Resume from a power safe. The BIOS already restored
1067 * the TPM state.
1068 */
1069 int tpm_pm_resume(struct device *dev)
1070 {
1071 struct tpm_chip *chip = dev_get_drvdata(dev);
1072
1073 if (chip == NULL)
1074 return -ENODEV;
1075
1076 return 0;
1077 }
1078 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1079
1080 /*
1081 * Once all references to platform device are down to 0,
1082 * release all allocated structures.
1083 * In case vendor provided release function,
1084 * call it too.
1085 */
1086 static void tpm_dev_release(struct device *dev)
1087 {
1088 struct tpm_chip *chip = dev_get_drvdata(dev);
1089
1090 if (chip->vendor.release)
1091 chip->vendor.release(dev);
1092
1093 chip->release(dev);
1094
1095 clear_bit(chip->dev_num, dev_mask);
1096 kfree(chip->vendor.miscdev.name);
1097 kfree(chip);
1098 }
1099
1100 /*
1101 * Called from tpm_<specific>.c probe function only for devices
1102 * the driver has determined it should claim. Prior to calling
1103 * this function the specific probe function has called pci_enable_device
1104 * upon errant exit from this function specific probe function should call
1105 * pci_disable_device
1106 */
1107 struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1108 *entry)
1109 {
1110 #define DEVNAME_SIZE 7
1111
1112 char *devname;
1113 struct tpm_chip *chip;
1114
1115 /* Driver specific per-device data */
1116 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1117 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1118
1119 if (chip == NULL || devname == NULL) {
1120 kfree(chip);
1121 kfree(devname);
1122 return NULL;
1123 }
1124
1125 mutex_init(&chip->buffer_mutex);
1126 mutex_init(&chip->tpm_mutex);
1127 INIT_LIST_HEAD(&chip->list);
1128
1129 INIT_WORK(&chip->work, timeout_work);
1130
1131 setup_timer(&chip->user_read_timer, user_reader_timeout,
1132 (unsigned long)chip);
1133
1134 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1135
1136 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1137
1138 if (chip->dev_num >= TPM_NUM_DEVICES) {
1139 dev_err(dev, "No available tpm device numbers\n");
1140 kfree(chip);
1141 return NULL;
1142 } else if (chip->dev_num == 0)
1143 chip->vendor.miscdev.minor = TPM_MINOR;
1144 else
1145 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1146
1147 set_bit(chip->dev_num, dev_mask);
1148
1149 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1150 chip->vendor.miscdev.name = devname;
1151
1152 chip->vendor.miscdev.parent = dev;
1153 chip->dev = get_device(dev);
1154 chip->release = dev->release;
1155 dev->release = tpm_dev_release;
1156 dev_set_drvdata(dev, chip);
1157
1158 if (misc_register(&chip->vendor.miscdev)) {
1159 dev_err(chip->dev,
1160 "unable to misc_register %s, minor %d\n",
1161 chip->vendor.miscdev.name,
1162 chip->vendor.miscdev.minor);
1163 put_device(chip->dev);
1164 return NULL;
1165 }
1166
1167 spin_lock(&driver_lock);
1168
1169 list_add(&chip->list, &tpm_chip_list);
1170
1171 spin_unlock(&driver_lock);
1172
1173 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1174 list_del(&chip->list);
1175 misc_deregister(&chip->vendor.miscdev);
1176 put_device(chip->dev);
1177 return NULL;
1178 }
1179
1180 chip->bios_dir = tpm_bios_log_setup(devname);
1181
1182 return chip;
1183 }
1184 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1185
1186 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1187 MODULE_DESCRIPTION("TPM Driver");
1188 MODULE_VERSION("2.0");
1189 MODULE_LICENSE("GPL");
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