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Remove the BKL calls from the TPM driver, which were added in the overall
[deliverable/linux.git] / drivers / char / tpm / tpm.c
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 #include <linux/smp_lock.h>
30
31 #include "tpm.h"
32
33 enum tpm_const {
34 TPM_MINOR = 224, /* officially assigned */
35 TPM_BUFSIZE = 2048,
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 static LIST_HEAD(tpm_chip_list);
51 static DEFINE_SPINLOCK(driver_lock);
52 static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES);
53
54 /*
55 * Array with one entry per ordinal defining the maximum amount
56 * of time the chip could take to return the result. The ordinal
57 * designation of short, medium or long is defined in a table in
58 * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
59 * values of the SHORT, MEDIUM, and LONG durations are retrieved
60 * from the chip during initialization with a call to tpm_get_timeouts.
61 */
62 static const u8 tpm_protected_ordinal_duration[TPM_MAX_PROTECTED_ORDINAL] = {
63 TPM_UNDEFINED, /* 0 */
64 TPM_UNDEFINED,
65 TPM_UNDEFINED,
66 TPM_UNDEFINED,
67 TPM_UNDEFINED,
68 TPM_UNDEFINED, /* 5 */
69 TPM_UNDEFINED,
70 TPM_UNDEFINED,
71 TPM_UNDEFINED,
72 TPM_UNDEFINED,
73 TPM_SHORT, /* 10 */
74 TPM_SHORT,
75 };
76
77 static const u8 tpm_ordinal_duration[TPM_MAX_ORDINAL] = {
78 TPM_UNDEFINED, /* 0 */
79 TPM_UNDEFINED,
80 TPM_UNDEFINED,
81 TPM_UNDEFINED,
82 TPM_UNDEFINED,
83 TPM_UNDEFINED, /* 5 */
84 TPM_UNDEFINED,
85 TPM_UNDEFINED,
86 TPM_UNDEFINED,
87 TPM_UNDEFINED,
88 TPM_SHORT, /* 10 */
89 TPM_SHORT,
90 TPM_MEDIUM,
91 TPM_LONG,
92 TPM_LONG,
93 TPM_MEDIUM, /* 15 */
94 TPM_SHORT,
95 TPM_SHORT,
96 TPM_MEDIUM,
97 TPM_LONG,
98 TPM_SHORT, /* 20 */
99 TPM_SHORT,
100 TPM_MEDIUM,
101 TPM_MEDIUM,
102 TPM_MEDIUM,
103 TPM_SHORT, /* 25 */
104 TPM_SHORT,
105 TPM_MEDIUM,
106 TPM_SHORT,
107 TPM_SHORT,
108 TPM_MEDIUM, /* 30 */
109 TPM_LONG,
110 TPM_MEDIUM,
111 TPM_SHORT,
112 TPM_SHORT,
113 TPM_SHORT, /* 35 */
114 TPM_MEDIUM,
115 TPM_MEDIUM,
116 TPM_UNDEFINED,
117 TPM_UNDEFINED,
118 TPM_MEDIUM, /* 40 */
119 TPM_LONG,
120 TPM_MEDIUM,
121 TPM_SHORT,
122 TPM_SHORT,
123 TPM_SHORT, /* 45 */
124 TPM_SHORT,
125 TPM_SHORT,
126 TPM_SHORT,
127 TPM_LONG,
128 TPM_MEDIUM, /* 50 */
129 TPM_MEDIUM,
130 TPM_UNDEFINED,
131 TPM_UNDEFINED,
132 TPM_UNDEFINED,
133 TPM_UNDEFINED, /* 55 */
134 TPM_UNDEFINED,
135 TPM_UNDEFINED,
136 TPM_UNDEFINED,
137 TPM_UNDEFINED,
138 TPM_MEDIUM, /* 60 */
139 TPM_MEDIUM,
140 TPM_MEDIUM,
141 TPM_SHORT,
142 TPM_SHORT,
143 TPM_MEDIUM, /* 65 */
144 TPM_UNDEFINED,
145 TPM_UNDEFINED,
146 TPM_UNDEFINED,
147 TPM_UNDEFINED,
148 TPM_SHORT, /* 70 */
149 TPM_SHORT,
150 TPM_UNDEFINED,
151 TPM_UNDEFINED,
152 TPM_UNDEFINED,
153 TPM_UNDEFINED, /* 75 */
154 TPM_UNDEFINED,
155 TPM_UNDEFINED,
156 TPM_UNDEFINED,
157 TPM_UNDEFINED,
158 TPM_LONG, /* 80 */
159 TPM_UNDEFINED,
160 TPM_MEDIUM,
161 TPM_LONG,
162 TPM_SHORT,
163 TPM_UNDEFINED, /* 85 */
164 TPM_UNDEFINED,
165 TPM_UNDEFINED,
166 TPM_UNDEFINED,
167 TPM_UNDEFINED,
168 TPM_SHORT, /* 90 */
169 TPM_SHORT,
170 TPM_SHORT,
171 TPM_SHORT,
172 TPM_SHORT,
173 TPM_UNDEFINED, /* 95 */
174 TPM_UNDEFINED,
175 TPM_UNDEFINED,
176 TPM_UNDEFINED,
177 TPM_UNDEFINED,
178 TPM_MEDIUM, /* 100 */
179 TPM_SHORT,
180 TPM_SHORT,
181 TPM_UNDEFINED,
182 TPM_UNDEFINED,
183 TPM_UNDEFINED, /* 105 */
184 TPM_UNDEFINED,
185 TPM_UNDEFINED,
186 TPM_UNDEFINED,
187 TPM_UNDEFINED,
188 TPM_SHORT, /* 110 */
189 TPM_SHORT,
190 TPM_SHORT,
191 TPM_SHORT,
192 TPM_SHORT,
193 TPM_SHORT, /* 115 */
194 TPM_SHORT,
195 TPM_SHORT,
196 TPM_UNDEFINED,
197 TPM_UNDEFINED,
198 TPM_LONG, /* 120 */
199 TPM_LONG,
200 TPM_MEDIUM,
201 TPM_UNDEFINED,
202 TPM_SHORT,
203 TPM_SHORT, /* 125 */
204 TPM_SHORT,
205 TPM_LONG,
206 TPM_SHORT,
207 TPM_SHORT,
208 TPM_SHORT, /* 130 */
209 TPM_MEDIUM,
210 TPM_UNDEFINED,
211 TPM_SHORT,
212 TPM_MEDIUM,
213 TPM_UNDEFINED, /* 135 */
214 TPM_UNDEFINED,
215 TPM_UNDEFINED,
216 TPM_UNDEFINED,
217 TPM_UNDEFINED,
218 TPM_SHORT, /* 140 */
219 TPM_SHORT,
220 TPM_UNDEFINED,
221 TPM_UNDEFINED,
222 TPM_UNDEFINED,
223 TPM_UNDEFINED, /* 145 */
224 TPM_UNDEFINED,
225 TPM_UNDEFINED,
226 TPM_UNDEFINED,
227 TPM_UNDEFINED,
228 TPM_SHORT, /* 150 */
229 TPM_MEDIUM,
230 TPM_MEDIUM,
231 TPM_SHORT,
232 TPM_SHORT,
233 TPM_UNDEFINED, /* 155 */
234 TPM_UNDEFINED,
235 TPM_UNDEFINED,
236 TPM_UNDEFINED,
237 TPM_UNDEFINED,
238 TPM_SHORT, /* 160 */
239 TPM_SHORT,
240 TPM_SHORT,
241 TPM_SHORT,
242 TPM_UNDEFINED,
243 TPM_UNDEFINED, /* 165 */
244 TPM_UNDEFINED,
245 TPM_UNDEFINED,
246 TPM_UNDEFINED,
247 TPM_UNDEFINED,
248 TPM_LONG, /* 170 */
249 TPM_UNDEFINED,
250 TPM_UNDEFINED,
251 TPM_UNDEFINED,
252 TPM_UNDEFINED,
253 TPM_UNDEFINED, /* 175 */
254 TPM_UNDEFINED,
255 TPM_UNDEFINED,
256 TPM_UNDEFINED,
257 TPM_UNDEFINED,
258 TPM_MEDIUM, /* 180 */
259 TPM_SHORT,
260 TPM_MEDIUM,
261 TPM_MEDIUM,
262 TPM_MEDIUM,
263 TPM_MEDIUM, /* 185 */
264 TPM_SHORT,
265 TPM_UNDEFINED,
266 TPM_UNDEFINED,
267 TPM_UNDEFINED,
268 TPM_UNDEFINED, /* 190 */
269 TPM_UNDEFINED,
270 TPM_UNDEFINED,
271 TPM_UNDEFINED,
272 TPM_UNDEFINED,
273 TPM_UNDEFINED, /* 195 */
274 TPM_UNDEFINED,
275 TPM_UNDEFINED,
276 TPM_UNDEFINED,
277 TPM_UNDEFINED,
278 TPM_SHORT, /* 200 */
279 TPM_UNDEFINED,
280 TPM_UNDEFINED,
281 TPM_UNDEFINED,
282 TPM_SHORT,
283 TPM_SHORT, /* 205 */
284 TPM_SHORT,
285 TPM_SHORT,
286 TPM_SHORT,
287 TPM_SHORT,
288 TPM_MEDIUM, /* 210 */
289 TPM_UNDEFINED,
290 TPM_MEDIUM,
291 TPM_MEDIUM,
292 TPM_MEDIUM,
293 TPM_UNDEFINED, /* 215 */
294 TPM_MEDIUM,
295 TPM_UNDEFINED,
296 TPM_UNDEFINED,
297 TPM_SHORT,
298 TPM_SHORT, /* 220 */
299 TPM_SHORT,
300 TPM_SHORT,
301 TPM_SHORT,
302 TPM_SHORT,
303 TPM_UNDEFINED, /* 225 */
304 TPM_UNDEFINED,
305 TPM_UNDEFINED,
306 TPM_UNDEFINED,
307 TPM_UNDEFINED,
308 TPM_SHORT, /* 230 */
309 TPM_LONG,
310 TPM_MEDIUM,
311 TPM_UNDEFINED,
312 TPM_UNDEFINED,
313 TPM_UNDEFINED, /* 235 */
314 TPM_UNDEFINED,
315 TPM_UNDEFINED,
316 TPM_UNDEFINED,
317 TPM_UNDEFINED,
318 TPM_SHORT, /* 240 */
319 TPM_UNDEFINED,
320 TPM_MEDIUM,
321 };
322
323 static void user_reader_timeout(unsigned long ptr)
324 {
325 struct tpm_chip *chip = (struct tpm_chip *) ptr;
326
327 schedule_work(&chip->work);
328 }
329
330 static void timeout_work(struct work_struct *work)
331 {
332 struct tpm_chip *chip = container_of(work, struct tpm_chip, work);
333
334 mutex_lock(&chip->buffer_mutex);
335 atomic_set(&chip->data_pending, 0);
336 memset(chip->data_buffer, 0, TPM_BUFSIZE);
337 mutex_unlock(&chip->buffer_mutex);
338 }
339
340 /*
341 * Returns max number of jiffies to wait
342 */
343 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip,
344 u32 ordinal)
345 {
346 int duration_idx = TPM_UNDEFINED;
347 int duration = 0;
348
349 if (ordinal < TPM_MAX_ORDINAL)
350 duration_idx = tpm_ordinal_duration[ordinal];
351 else if ((ordinal & TPM_PROTECTED_ORDINAL_MASK) <
352 TPM_MAX_PROTECTED_ORDINAL)
353 duration_idx =
354 tpm_protected_ordinal_duration[ordinal &
355 TPM_PROTECTED_ORDINAL_MASK];
356
357 if (duration_idx != TPM_UNDEFINED)
358 duration = chip->vendor.duration[duration_idx];
359 if (duration <= 0)
360 return 2 * 60 * HZ;
361 else
362 return duration;
363 }
364 EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration);
365
366 /*
367 * Internal kernel interface to transmit TPM commands
368 */
369 static ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
370 size_t bufsiz)
371 {
372 ssize_t rc;
373 u32 count, ordinal;
374 unsigned long stop;
375
376 count = be32_to_cpu(*((__be32 *) (buf + 2)));
377 ordinal = be32_to_cpu(*((__be32 *) (buf + 6)));
378 if (count == 0)
379 return -ENODATA;
380 if (count > bufsiz) {
381 dev_err(chip->dev,
382 "invalid count value %x %zx \n", count, bufsiz);
383 return -E2BIG;
384 }
385
386 mutex_lock(&chip->tpm_mutex);
387
388 if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) {
389 dev_err(chip->dev,
390 "tpm_transmit: tpm_send: error %zd\n", rc);
391 goto out;
392 }
393
394 if (chip->vendor.irq)
395 goto out_recv;
396
397 stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal);
398 do {
399 u8 status = chip->vendor.status(chip);
400 if ((status & chip->vendor.req_complete_mask) ==
401 chip->vendor.req_complete_val)
402 goto out_recv;
403
404 if ((status == chip->vendor.req_canceled)) {
405 dev_err(chip->dev, "Operation Canceled\n");
406 rc = -ECANCELED;
407 goto out;
408 }
409
410 msleep(TPM_TIMEOUT); /* CHECK */
411 rmb();
412 } while (time_before(jiffies, stop));
413
414 chip->vendor.cancel(chip);
415 dev_err(chip->dev, "Operation Timed out\n");
416 rc = -ETIME;
417 goto out;
418
419 out_recv:
420 rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz);
421 if (rc < 0)
422 dev_err(chip->dev,
423 "tpm_transmit: tpm_recv: error %zd\n", rc);
424 out:
425 mutex_unlock(&chip->tpm_mutex);
426 return rc;
427 }
428
429 #define TPM_DIGEST_SIZE 20
430 #define TPM_ERROR_SIZE 10
431 #define TPM_RET_CODE_IDX 6
432 #define TPM_GET_CAP_RET_SIZE_IDX 10
433 #define TPM_GET_CAP_RET_UINT32_1_IDX 14
434 #define TPM_GET_CAP_RET_UINT32_2_IDX 18
435 #define TPM_GET_CAP_RET_UINT32_3_IDX 22
436 #define TPM_GET_CAP_RET_UINT32_4_IDX 26
437 #define TPM_GET_CAP_PERM_DISABLE_IDX 16
438 #define TPM_GET_CAP_PERM_INACTIVE_IDX 18
439 #define TPM_GET_CAP_RET_BOOL_1_IDX 14
440 #define TPM_GET_CAP_TEMP_INACTIVE_IDX 16
441
442 #define TPM_CAP_IDX 13
443 #define TPM_CAP_SUBCAP_IDX 21
444
445 enum tpm_capabilities {
446 TPM_CAP_FLAG = 4,
447 TPM_CAP_PROP = 5,
448 };
449
450 enum tpm_sub_capabilities {
451 TPM_CAP_PROP_PCR = 0x1,
452 TPM_CAP_PROP_MANUFACTURER = 0x3,
453 TPM_CAP_FLAG_PERM = 0x8,
454 TPM_CAP_FLAG_VOL = 0x9,
455 TPM_CAP_PROP_OWNER = 0x11,
456 TPM_CAP_PROP_TIS_TIMEOUT = 0x15,
457 TPM_CAP_PROP_TIS_DURATION = 0x20,
458 };
459
460 /*
461 * This is a semi generic GetCapability command for use
462 * with the capability type TPM_CAP_PROP or TPM_CAP_FLAG
463 * and their associated sub_capabilities.
464 */
465
466 static const u8 tpm_cap[] = {
467 0, 193, /* TPM_TAG_RQU_COMMAND */
468 0, 0, 0, 22, /* length */
469 0, 0, 0, 101, /* TPM_ORD_GetCapability */
470 0, 0, 0, 0, /* TPM_CAP_<TYPE> */
471 0, 0, 0, 4, /* TPM_CAP_SUB_<TYPE> size */
472 0, 0, 1, 0 /* TPM_CAP_SUB_<TYPE> */
473 };
474
475 static ssize_t transmit_cmd(struct tpm_chip *chip, u8 *data, int len,
476 char *desc)
477 {
478 int err;
479
480 len = tpm_transmit(chip, data, len);
481 if (len < 0)
482 return len;
483 if (len == TPM_ERROR_SIZE) {
484 err = be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX)));
485 dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc);
486 return err;
487 }
488 return 0;
489 }
490
491 void tpm_gen_interrupt(struct tpm_chip *chip)
492 {
493 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
494 ssize_t rc;
495
496 memcpy(data, tpm_cap, sizeof(tpm_cap));
497 data[TPM_CAP_IDX] = TPM_CAP_PROP;
498 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
499
500 rc = transmit_cmd(chip, data, sizeof(data),
501 "attempting to determine the timeouts");
502 }
503 EXPORT_SYMBOL_GPL(tpm_gen_interrupt);
504
505 void tpm_get_timeouts(struct tpm_chip *chip)
506 {
507 u8 data[max_t(int, ARRAY_SIZE(tpm_cap), 30)];
508 ssize_t rc;
509 u32 timeout;
510
511 memcpy(data, tpm_cap, sizeof(tpm_cap));
512 data[TPM_CAP_IDX] = TPM_CAP_PROP;
513 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_TIMEOUT;
514
515 rc = transmit_cmd(chip, data, sizeof(data),
516 "attempting to determine the timeouts");
517 if (rc)
518 goto duration;
519
520 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
521 != 4 * sizeof(u32))
522 goto duration;
523
524 /* Don't overwrite default if value is 0 */
525 timeout =
526 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX)));
527 if (timeout)
528 chip->vendor.timeout_a = msecs_to_jiffies(timeout);
529 timeout =
530 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_2_IDX)));
531 if (timeout)
532 chip->vendor.timeout_b = msecs_to_jiffies(timeout);
533 timeout =
534 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_3_IDX)));
535 if (timeout)
536 chip->vendor.timeout_c = msecs_to_jiffies(timeout);
537 timeout =
538 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_4_IDX)));
539 if (timeout)
540 chip->vendor.timeout_d = msecs_to_jiffies(timeout);
541
542 duration:
543 memcpy(data, tpm_cap, sizeof(tpm_cap));
544 data[TPM_CAP_IDX] = TPM_CAP_PROP;
545 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_TIS_DURATION;
546
547 rc = transmit_cmd(chip, data, sizeof(data),
548 "attempting to determine the durations");
549 if (rc)
550 return;
551
552 if (be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_SIZE_IDX)))
553 != 3 * sizeof(u32))
554 return;
555
556 chip->vendor.duration[TPM_SHORT] =
557 msecs_to_jiffies(be32_to_cpu
558 (*((__be32 *) (data +
559 TPM_GET_CAP_RET_UINT32_1_IDX))));
560 chip->vendor.duration[TPM_MEDIUM] =
561 msecs_to_jiffies(be32_to_cpu
562 (*((__be32 *) (data +
563 TPM_GET_CAP_RET_UINT32_2_IDX))));
564 chip->vendor.duration[TPM_LONG] =
565 msecs_to_jiffies(be32_to_cpu
566 (*((__be32 *) (data +
567 TPM_GET_CAP_RET_UINT32_3_IDX))));
568 }
569 EXPORT_SYMBOL_GPL(tpm_get_timeouts);
570
571 void tpm_continue_selftest(struct tpm_chip *chip)
572 {
573 u8 data[] = {
574 0, 193, /* TPM_TAG_RQU_COMMAND */
575 0, 0, 0, 10, /* length */
576 0, 0, 0, 83, /* TPM_ORD_GetCapability */
577 };
578
579 tpm_transmit(chip, data, sizeof(data));
580 }
581 EXPORT_SYMBOL_GPL(tpm_continue_selftest);
582
583 #define TPM_INTERNAL_RESULT_SIZE 200
584
585 ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr,
586 char *buf)
587 {
588 u8 *data;
589 ssize_t rc;
590
591 struct tpm_chip *chip = dev_get_drvdata(dev);
592 if (chip == NULL)
593 return -ENODEV;
594
595 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
596 if (!data)
597 return -ENOMEM;
598
599 memcpy(data, tpm_cap, sizeof(tpm_cap));
600 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
601 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
602
603 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
604 "attemtping to determine the permanent enabled state");
605 if (rc) {
606 kfree(data);
607 return 0;
608 }
609
610 rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_DISABLE_IDX]);
611
612 kfree(data);
613 return rc;
614 }
615 EXPORT_SYMBOL_GPL(tpm_show_enabled);
616
617 ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr,
618 char *buf)
619 {
620 u8 *data;
621 ssize_t rc;
622
623 struct tpm_chip *chip = dev_get_drvdata(dev);
624 if (chip == NULL)
625 return -ENODEV;
626
627 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
628 if (!data)
629 return -ENOMEM;
630
631 memcpy(data, tpm_cap, sizeof(tpm_cap));
632 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
633 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_PERM;
634
635 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
636 "attemtping to determine the permanent active state");
637 if (rc) {
638 kfree(data);
639 return 0;
640 }
641
642 rc = sprintf(buf, "%d\n", !data[TPM_GET_CAP_PERM_INACTIVE_IDX]);
643
644 kfree(data);
645 return rc;
646 }
647 EXPORT_SYMBOL_GPL(tpm_show_active);
648
649 ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr,
650 char *buf)
651 {
652 u8 *data;
653 ssize_t rc;
654
655 struct tpm_chip *chip = dev_get_drvdata(dev);
656 if (chip == NULL)
657 return -ENODEV;
658
659 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
660 if (!data)
661 return -ENOMEM;
662
663 memcpy(data, tpm_cap, sizeof(tpm_cap));
664 data[TPM_CAP_IDX] = TPM_CAP_PROP;
665 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_OWNER;
666
667 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
668 "attempting to determine the owner state");
669 if (rc) {
670 kfree(data);
671 return 0;
672 }
673
674 rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_RET_BOOL_1_IDX]);
675
676 kfree(data);
677 return rc;
678 }
679 EXPORT_SYMBOL_GPL(tpm_show_owned);
680
681 ssize_t tpm_show_temp_deactivated(struct device * dev,
682 struct device_attribute * attr, char *buf)
683 {
684 u8 *data;
685 ssize_t rc;
686
687 struct tpm_chip *chip = dev_get_drvdata(dev);
688 if (chip == NULL)
689 return -ENODEV;
690
691 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
692 if (!data)
693 return -ENOMEM;
694
695 memcpy(data, tpm_cap, sizeof(tpm_cap));
696 data[TPM_CAP_IDX] = TPM_CAP_FLAG;
697 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_FLAG_VOL;
698
699 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
700 "attempting to determine the temporary state");
701 if (rc) {
702 kfree(data);
703 return 0;
704 }
705
706 rc = sprintf(buf, "%d\n", data[TPM_GET_CAP_TEMP_INACTIVE_IDX]);
707
708 kfree(data);
709 return rc;
710 }
711 EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated);
712
713 static const u8 pcrread[] = {
714 0, 193, /* TPM_TAG_RQU_COMMAND */
715 0, 0, 0, 14, /* length */
716 0, 0, 0, 21, /* TPM_ORD_PcrRead */
717 0, 0, 0, 0 /* PCR index */
718 };
719
720 ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr,
721 char *buf)
722 {
723 u8 *data;
724 ssize_t rc;
725 int i, j, num_pcrs;
726 __be32 index;
727 char *str = buf;
728
729 struct tpm_chip *chip = dev_get_drvdata(dev);
730 if (chip == NULL)
731 return -ENODEV;
732
733 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
734 if (!data)
735 return -ENOMEM;
736
737 memcpy(data, tpm_cap, sizeof(tpm_cap));
738 data[TPM_CAP_IDX] = TPM_CAP_PROP;
739 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_PCR;
740
741 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
742 "attempting to determine the number of PCRS");
743 if (rc) {
744 kfree(data);
745 return 0;
746 }
747
748 num_pcrs = be32_to_cpu(*((__be32 *) (data + 14)));
749 for (i = 0; i < num_pcrs; i++) {
750 memcpy(data, pcrread, sizeof(pcrread));
751 index = cpu_to_be32(i);
752 memcpy(data + 10, &index, 4);
753 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
754 "attempting to read a PCR");
755 if (rc)
756 goto out;
757 str += sprintf(str, "PCR-%02d: ", i);
758 for (j = 0; j < TPM_DIGEST_SIZE; j++)
759 str += sprintf(str, "%02X ", *(data + 10 + j));
760 str += sprintf(str, "\n");
761 }
762 out:
763 kfree(data);
764 return str - buf;
765 }
766 EXPORT_SYMBOL_GPL(tpm_show_pcrs);
767
768 #define READ_PUBEK_RESULT_SIZE 314
769 static const u8 readpubek[] = {
770 0, 193, /* TPM_TAG_RQU_COMMAND */
771 0, 0, 0, 30, /* length */
772 0, 0, 0, 124, /* TPM_ORD_ReadPubek */
773 };
774
775 ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr,
776 char *buf)
777 {
778 u8 *data;
779 ssize_t err;
780 int i, rc;
781 char *str = buf;
782
783 struct tpm_chip *chip = dev_get_drvdata(dev);
784 if (chip == NULL)
785 return -ENODEV;
786
787 data = kzalloc(READ_PUBEK_RESULT_SIZE, GFP_KERNEL);
788 if (!data)
789 return -ENOMEM;
790
791 memcpy(data, readpubek, sizeof(readpubek));
792
793 err = transmit_cmd(chip, data, READ_PUBEK_RESULT_SIZE,
794 "attempting to read the PUBEK");
795 if (err)
796 goto out;
797
798 /*
799 ignore header 10 bytes
800 algorithm 32 bits (1 == RSA )
801 encscheme 16 bits
802 sigscheme 16 bits
803 parameters (RSA 12->bytes: keybit, #primes, expbit)
804 keylenbytes 32 bits
805 256 byte modulus
806 ignore checksum 20 bytes
807 */
808
809 str +=
810 sprintf(str,
811 "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n"
812 "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X"
813 " %02X %02X %02X %02X %02X %02X %02X %02X\n"
814 "Modulus length: %d\nModulus: \n",
815 data[10], data[11], data[12], data[13], data[14],
816 data[15], data[16], data[17], data[22], data[23],
817 data[24], data[25], data[26], data[27], data[28],
818 data[29], data[30], data[31], data[32], data[33],
819 be32_to_cpu(*((__be32 *) (data + 34))));
820
821 for (i = 0; i < 256; i++) {
822 str += sprintf(str, "%02X ", data[i + 38]);
823 if ((i + 1) % 16 == 0)
824 str += sprintf(str, "\n");
825 }
826 out:
827 rc = str - buf;
828 kfree(data);
829 return rc;
830 }
831 EXPORT_SYMBOL_GPL(tpm_show_pubek);
832
833 #define CAP_VERSION_1_1 6
834 #define CAP_VERSION_1_2 0x1A
835 #define CAP_VERSION_IDX 13
836 static const u8 cap_version[] = {
837 0, 193, /* TPM_TAG_RQU_COMMAND */
838 0, 0, 0, 18, /* length */
839 0, 0, 0, 101, /* TPM_ORD_GetCapability */
840 0, 0, 0, 0,
841 0, 0, 0, 0
842 };
843
844 ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr,
845 char *buf)
846 {
847 u8 *data;
848 ssize_t rc;
849 char *str = buf;
850
851 struct tpm_chip *chip = dev_get_drvdata(dev);
852 if (chip == NULL)
853 return -ENODEV;
854
855 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
856 if (!data)
857 return -ENOMEM;
858
859 memcpy(data, tpm_cap, sizeof(tpm_cap));
860 data[TPM_CAP_IDX] = TPM_CAP_PROP;
861 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
862
863 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
864 "attempting to determine the manufacturer");
865 if (rc) {
866 kfree(data);
867 return 0;
868 }
869
870 str += sprintf(str, "Manufacturer: 0x%x\n",
871 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
872
873 memcpy(data, cap_version, sizeof(cap_version));
874 data[CAP_VERSION_IDX] = CAP_VERSION_1_1;
875 rc = transmit_cmd(chip, data, TPM_INTERNAL_RESULT_SIZE,
876 "attempting to determine the 1.1 version");
877 if (rc)
878 goto out;
879
880 str += sprintf(str,
881 "TCG version: %d.%d\nFirmware version: %d.%d\n",
882 (int) data[14], (int) data[15], (int) data[16],
883 (int) data[17]);
884
885 out:
886 kfree(data);
887 return str - buf;
888 }
889 EXPORT_SYMBOL_GPL(tpm_show_caps);
890
891 ssize_t tpm_show_caps_1_2(struct device * dev,
892 struct device_attribute * attr, char *buf)
893 {
894 u8 *data;
895 ssize_t len;
896 char *str = buf;
897
898 struct tpm_chip *chip = dev_get_drvdata(dev);
899 if (chip == NULL)
900 return -ENODEV;
901
902 data = kzalloc(TPM_INTERNAL_RESULT_SIZE, GFP_KERNEL);
903 if (!data)
904 return -ENOMEM;
905
906 memcpy(data, tpm_cap, sizeof(tpm_cap));
907 data[TPM_CAP_IDX] = TPM_CAP_PROP;
908 data[TPM_CAP_SUBCAP_IDX] = TPM_CAP_PROP_MANUFACTURER;
909
910 len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
911 if (len <= TPM_ERROR_SIZE) {
912 dev_dbg(chip->dev, "A TPM error (%d) occurred "
913 "attempting to determine the manufacturer\n",
914 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
915 kfree(data);
916 return 0;
917 }
918
919 str += sprintf(str, "Manufacturer: 0x%x\n",
920 be32_to_cpu(*((__be32 *) (data + TPM_GET_CAP_RET_UINT32_1_IDX))));
921
922 memcpy(data, cap_version, sizeof(cap_version));
923 data[CAP_VERSION_IDX] = CAP_VERSION_1_2;
924
925 len = tpm_transmit(chip, data, TPM_INTERNAL_RESULT_SIZE);
926 if (len <= TPM_ERROR_SIZE) {
927 dev_err(chip->dev, "A TPM error (%d) occurred "
928 "attempting to determine the 1.2 version\n",
929 be32_to_cpu(*((__be32 *) (data + TPM_RET_CODE_IDX))));
930 goto out;
931 }
932 str += sprintf(str,
933 "TCG version: %d.%d\nFirmware version: %d.%d\n",
934 (int) data[16], (int) data[17], (int) data[18],
935 (int) data[19]);
936
937 out:
938 kfree(data);
939 return str - buf;
940 }
941 EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
942
943 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
944 const char *buf, size_t count)
945 {
946 struct tpm_chip *chip = dev_get_drvdata(dev);
947 if (chip == NULL)
948 return 0;
949
950 chip->vendor.cancel(chip);
951 return count;
952 }
953 EXPORT_SYMBOL_GPL(tpm_store_cancel);
954
955 /*
956 * Device file system interface to the TPM
957 *
958 * It's assured that the chip will be opened just once,
959 * by the check of is_open variable, which is protected
960 * by driver_lock.
961 */
962 int tpm_open(struct inode *inode, struct file *file)
963 {
964 int rc = 0, minor = iminor(inode);
965 struct tpm_chip *chip = NULL, *pos;
966
967 spin_lock(&driver_lock);
968
969 list_for_each_entry(pos, &tpm_chip_list, list) {
970 if (pos->vendor.miscdev.minor == minor) {
971 chip = pos;
972 break;
973 }
974 }
975
976 if (chip == NULL) {
977 rc = -ENODEV;
978 goto err_out;
979 }
980
981 if (chip->num_opens) {
982 dev_dbg(chip->dev, "Another process owns this TPM\n");
983 rc = -EBUSY;
984 goto err_out;
985 }
986
987 chip->num_opens++;
988 get_device(chip->dev);
989
990 spin_unlock(&driver_lock);
991
992 chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL);
993 if (chip->data_buffer == NULL) {
994 chip->num_opens--;
995 put_device(chip->dev);
996 return -ENOMEM;
997 }
998
999 atomic_set(&chip->data_pending, 0);
1000
1001 file->private_data = chip;
1002 return 0;
1003
1004 err_out:
1005 spin_unlock(&driver_lock);
1006 return rc;
1007 }
1008 EXPORT_SYMBOL_GPL(tpm_open);
1009
1010 int tpm_release(struct inode *inode, struct file *file)
1011 {
1012 struct tpm_chip *chip = file->private_data;
1013
1014 flush_scheduled_work();
1015 spin_lock(&driver_lock);
1016 file->private_data = NULL;
1017 del_singleshot_timer_sync(&chip->user_read_timer);
1018 atomic_set(&chip->data_pending, 0);
1019 chip->num_opens--;
1020 put_device(chip->dev);
1021 kfree(chip->data_buffer);
1022 spin_unlock(&driver_lock);
1023 return 0;
1024 }
1025 EXPORT_SYMBOL_GPL(tpm_release);
1026
1027 ssize_t tpm_write(struct file *file, const char __user *buf,
1028 size_t size, loff_t *off)
1029 {
1030 struct tpm_chip *chip = file->private_data;
1031 size_t in_size = size, out_size;
1032
1033 /* cannot perform a write until the read has cleared
1034 either via tpm_read or a user_read_timer timeout */
1035 while (atomic_read(&chip->data_pending) != 0)
1036 msleep(TPM_TIMEOUT);
1037
1038 mutex_lock(&chip->buffer_mutex);
1039
1040 if (in_size > TPM_BUFSIZE)
1041 in_size = TPM_BUFSIZE;
1042
1043 if (copy_from_user
1044 (chip->data_buffer, (void __user *) buf, in_size)) {
1045 mutex_unlock(&chip->buffer_mutex);
1046 return -EFAULT;
1047 }
1048
1049 /* atomic tpm command send and result receive */
1050 out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE);
1051
1052 atomic_set(&chip->data_pending, out_size);
1053 mutex_unlock(&chip->buffer_mutex);
1054
1055 /* Set a timeout by which the reader must come claim the result */
1056 mod_timer(&chip->user_read_timer, jiffies + (60 * HZ));
1057
1058 return in_size;
1059 }
1060 EXPORT_SYMBOL_GPL(tpm_write);
1061
1062 ssize_t tpm_read(struct file *file, char __user *buf,
1063 size_t size, loff_t *off)
1064 {
1065 struct tpm_chip *chip = file->private_data;
1066 ssize_t ret_size;
1067
1068 del_singleshot_timer_sync(&chip->user_read_timer);
1069 flush_scheduled_work();
1070 ret_size = atomic_read(&chip->data_pending);
1071 atomic_set(&chip->data_pending, 0);
1072 if (ret_size > 0) { /* relay data */
1073 if (size < ret_size)
1074 ret_size = size;
1075
1076 mutex_lock(&chip->buffer_mutex);
1077 if (copy_to_user(buf, chip->data_buffer, ret_size))
1078 ret_size = -EFAULT;
1079 mutex_unlock(&chip->buffer_mutex);
1080 }
1081
1082 return ret_size;
1083 }
1084 EXPORT_SYMBOL_GPL(tpm_read);
1085
1086 void tpm_remove_hardware(struct device *dev)
1087 {
1088 struct tpm_chip *chip = dev_get_drvdata(dev);
1089
1090 if (chip == NULL) {
1091 dev_err(dev, "No device data found\n");
1092 return;
1093 }
1094
1095 spin_lock(&driver_lock);
1096
1097 list_del(&chip->list);
1098
1099 spin_unlock(&driver_lock);
1100
1101 misc_deregister(&chip->vendor.miscdev);
1102
1103 sysfs_remove_group(&dev->kobj, chip->vendor.attr_group);
1104 tpm_bios_log_teardown(chip->bios_dir);
1105
1106 /* write it this way to be explicit (chip->dev == dev) */
1107 put_device(chip->dev);
1108 }
1109 EXPORT_SYMBOL_GPL(tpm_remove_hardware);
1110
1111 /*
1112 * We are about to suspend. Save the TPM state
1113 * so that it can be restored.
1114 */
1115 int tpm_pm_suspend(struct device *dev, pm_message_t pm_state)
1116 {
1117 struct tpm_chip *chip = dev_get_drvdata(dev);
1118 u8 savestate[] = {
1119 0, 193, /* TPM_TAG_RQU_COMMAND */
1120 0, 0, 0, 10, /* blob length (in bytes) */
1121 0, 0, 0, 152 /* TPM_ORD_SaveState */
1122 };
1123
1124 if (chip == NULL)
1125 return -ENODEV;
1126
1127 tpm_transmit(chip, savestate, sizeof(savestate));
1128 return 0;
1129 }
1130 EXPORT_SYMBOL_GPL(tpm_pm_suspend);
1131
1132 /*
1133 * Resume from a power safe. The BIOS already restored
1134 * the TPM state.
1135 */
1136 int tpm_pm_resume(struct device *dev)
1137 {
1138 struct tpm_chip *chip = dev_get_drvdata(dev);
1139
1140 if (chip == NULL)
1141 return -ENODEV;
1142
1143 return 0;
1144 }
1145 EXPORT_SYMBOL_GPL(tpm_pm_resume);
1146
1147 /*
1148 * Once all references to platform device are down to 0,
1149 * release all allocated structures.
1150 * In case vendor provided release function,
1151 * call it too.
1152 */
1153 static void tpm_dev_release(struct device *dev)
1154 {
1155 struct tpm_chip *chip = dev_get_drvdata(dev);
1156
1157 if (chip->vendor.release)
1158 chip->vendor.release(dev);
1159
1160 chip->release(dev);
1161
1162 clear_bit(chip->dev_num, dev_mask);
1163 kfree(chip->vendor.miscdev.name);
1164 kfree(chip);
1165 }
1166
1167 /*
1168 * Called from tpm_<specific>.c probe function only for devices
1169 * the driver has determined it should claim. Prior to calling
1170 * this function the specific probe function has called pci_enable_device
1171 * upon errant exit from this function specific probe function should call
1172 * pci_disable_device
1173 */
1174 struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific
1175 *entry)
1176 {
1177 #define DEVNAME_SIZE 7
1178
1179 char *devname;
1180 struct tpm_chip *chip;
1181
1182 /* Driver specific per-device data */
1183 chip = kzalloc(sizeof(*chip), GFP_KERNEL);
1184 devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL);
1185
1186 if (chip == NULL || devname == NULL) {
1187 kfree(chip);
1188 kfree(devname);
1189 return NULL;
1190 }
1191
1192 mutex_init(&chip->buffer_mutex);
1193 mutex_init(&chip->tpm_mutex);
1194 INIT_LIST_HEAD(&chip->list);
1195
1196 INIT_WORK(&chip->work, timeout_work);
1197
1198 setup_timer(&chip->user_read_timer, user_reader_timeout,
1199 (unsigned long)chip);
1200
1201 memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific));
1202
1203 chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES);
1204
1205 if (chip->dev_num >= TPM_NUM_DEVICES) {
1206 dev_err(dev, "No available tpm device numbers\n");
1207 kfree(chip);
1208 return NULL;
1209 } else if (chip->dev_num == 0)
1210 chip->vendor.miscdev.minor = TPM_MINOR;
1211 else
1212 chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR;
1213
1214 set_bit(chip->dev_num, dev_mask);
1215
1216 scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num);
1217 chip->vendor.miscdev.name = devname;
1218
1219 chip->vendor.miscdev.parent = dev;
1220 chip->dev = get_device(dev);
1221 chip->release = dev->release;
1222 dev->release = tpm_dev_release;
1223 dev_set_drvdata(dev, chip);
1224
1225 if (misc_register(&chip->vendor.miscdev)) {
1226 dev_err(chip->dev,
1227 "unable to misc_register %s, minor %d\n",
1228 chip->vendor.miscdev.name,
1229 chip->vendor.miscdev.minor);
1230 put_device(chip->dev);
1231 return NULL;
1232 }
1233
1234 spin_lock(&driver_lock);
1235
1236 list_add(&chip->list, &tpm_chip_list);
1237
1238 spin_unlock(&driver_lock);
1239
1240 if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) {
1241 list_del(&chip->list);
1242 misc_deregister(&chip->vendor.miscdev);
1243 put_device(chip->dev);
1244 return NULL;
1245 }
1246
1247 chip->bios_dir = tpm_bios_log_setup(devname);
1248
1249 return chip;
1250 }
1251 EXPORT_SYMBOL_GPL(tpm_register_hardware);
1252
1253 MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)");
1254 MODULE_DESCRIPTION("TPM Driver");
1255 MODULE_VERSION("2.0");
1256 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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