Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2004 IBM Corporation | |
3 | * | |
4 | * Authors: | |
5 | * Leendert van Doorn <leendert@watson.ibm.com> | |
6 | * Dave Safford <safford@watson.ibm.com> | |
7 | * Reiner Sailer <sailer@watson.ibm.com> | |
8 | * Kylene Hall <kjhall@us.ibm.com> | |
9 | * | |
8e81cc13 | 10 | * Maintained by: <tpmdd-devel@lists.sourceforge.net> |
1da177e4 LT |
11 | * |
12 | * Device driver for TCG/TCPA TPM (trusted platform module). | |
13 | * Specifications at www.trustedcomputinggroup.org | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License as | |
17 | * published by the Free Software Foundation, version 2 of the | |
18 | * License. | |
19 | * | |
20 | * Note, the TPM chip is not interrupt driven (only polling) | |
21 | * and can have very long timeouts (minutes!). Hence the unusual | |
700d8bdc | 22 | * calls to msleep. |
1da177e4 LT |
23 | * |
24 | */ | |
25 | ||
1da177e4 | 26 | #include <linux/poll.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
d081d470 | 28 | #include <linux/mutex.h> |
1da177e4 | 29 | #include <linux/spinlock.h> |
d081d470 | 30 | |
1da177e4 LT |
31 | #include "tpm.h" |
32 | ||
3122a88a KH |
33 | enum tpm_const { |
34 | TPM_MINOR = 224, /* officially assigned */ | |
7f366784 | 35 | TPM_BUFSIZE = 4096, |
3122a88a | 36 | TPM_NUM_DEVICES = 256, |
3122a88a | 37 | }; |
1da177e4 | 38 | |
9e18ee19 KJH |
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 | ||
9b3056cc DT |
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 | ||
1da177e4 LT |
60 | static LIST_HEAD(tpm_chip_list); |
61 | static DEFINE_SPINLOCK(driver_lock); | |
10685a95 | 62 | static DECLARE_BITMAP(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 63 | |
9e18ee19 KJH |
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 | ||
1da177e4 LT |
333 | static void user_reader_timeout(unsigned long ptr) |
334 | { | |
335 | struct tpm_chip *chip = (struct tpm_chip *) ptr; | |
336 | ||
09e12f9f KJH |
337 | schedule_work(&chip->work); |
338 | } | |
339 | ||
c4028958 | 340 | static void timeout_work(struct work_struct *work) |
09e12f9f | 341 | { |
c4028958 | 342 | struct tpm_chip *chip = container_of(work, struct tpm_chip, work); |
09e12f9f | 343 | |
d081d470 | 344 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
345 | atomic_set(&chip->data_pending, 0); |
346 | memset(chip->data_buffer, 0, TPM_BUFSIZE); | |
d081d470 | 347 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
348 | } |
349 | ||
9e18ee19 KJH |
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 | ||
8d1dc20e | 367 | if (duration_idx != TPM_UNDEFINED) |
36b20020 | 368 | duration = chip->vendor.duration[duration_idx]; |
8d1dc20e | 369 | if (duration <= 0) |
9e18ee19 | 370 | return 2 * 60 * HZ; |
8d1dc20e LT |
371 | else |
372 | return duration; | |
9e18ee19 KJH |
373 | } |
374 | EXPORT_SYMBOL_GPL(tpm_calc_ordinal_duration); | |
375 | ||
1da177e4 LT |
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 | { | |
d9e5b6bf | 382 | ssize_t rc; |
9e18ee19 | 383 | u32 count, ordinal; |
700d8bdc | 384 | unsigned long stop; |
1da177e4 | 385 | |
81179bb6 | 386 | count = be32_to_cpu(*((__be32 *) (buf + 2))); |
9e18ee19 | 387 | ordinal = be32_to_cpu(*((__be32 *) (buf + 6))); |
1da177e4 LT |
388 | if (count == 0) |
389 | return -ENODATA; | |
390 | if (count > bufsiz) { | |
e659a3fe | 391 | dev_err(chip->dev, |
b76be681 | 392 | "invalid count value %x %zx \n", count, bufsiz); |
1da177e4 LT |
393 | return -E2BIG; |
394 | } | |
395 | ||
d081d470 | 396 | mutex_lock(&chip->tpm_mutex); |
1da177e4 | 397 | |
90dda520 | 398 | if ((rc = chip->vendor.send(chip, (u8 *) buf, count)) < 0) { |
e659a3fe | 399 | dev_err(chip->dev, |
d9e5b6bf KH |
400 | "tpm_transmit: tpm_send: error %zd\n", rc); |
401 | goto out; | |
1da177e4 LT |
402 | } |
403 | ||
27084efe LD |
404 | if (chip->vendor.irq) |
405 | goto out_recv; | |
406 | ||
9e18ee19 | 407 | stop = jiffies + tpm_calc_ordinal_duration(chip, ordinal); |
1da177e4 | 408 | do { |
90dda520 KJH |
409 | u8 status = chip->vendor.status(chip); |
410 | if ((status & chip->vendor.req_complete_mask) == | |
411 | chip->vendor.req_complete_val) | |
1da177e4 | 412 | goto out_recv; |
d9e5b6bf | 413 | |
90dda520 | 414 | if ((status == chip->vendor.req_canceled)) { |
e659a3fe | 415 | dev_err(chip->dev, "Operation Canceled\n"); |
d9e5b6bf KH |
416 | rc = -ECANCELED; |
417 | goto out; | |
418 | } | |
419 | ||
420 | msleep(TPM_TIMEOUT); /* CHECK */ | |
1da177e4 | 421 | rmb(); |
700d8bdc | 422 | } while (time_before(jiffies, stop)); |
1da177e4 | 423 | |
90dda520 | 424 | chip->vendor.cancel(chip); |
e659a3fe | 425 | dev_err(chip->dev, "Operation Timed out\n"); |
d9e5b6bf KH |
426 | rc = -ETIME; |
427 | goto out; | |
1da177e4 LT |
428 | |
429 | out_recv: | |
90dda520 | 430 | rc = chip->vendor.recv(chip, (u8 *) buf, bufsiz); |
d9e5b6bf | 431 | if (rc < 0) |
e659a3fe | 432 | dev_err(chip->dev, |
d9e5b6bf KH |
433 | "tpm_transmit: tpm_recv: error %zd\n", rc); |
434 | out: | |
d081d470 | 435 | mutex_unlock(&chip->tpm_mutex); |
d9e5b6bf | 436 | return rc; |
1da177e4 LT |
437 | } |
438 | ||
439 | #define TPM_DIGEST_SIZE 20 | |
beed53a1 KJH |
440 | #define TPM_ERROR_SIZE 10 |
441 | #define TPM_RET_CODE_IDX 6 | |
beed53a1 KJH |
442 | |
443 | enum tpm_capabilities { | |
08837438 RA |
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) | |
beed53a1 KJH |
448 | }; |
449 | ||
450 | enum tpm_sub_capabilities { | |
08837438 RA |
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), | |
beed53a1 | 458 | |
1da177e4 LT |
459 | }; |
460 | ||
08837438 RA |
461 | static ssize_t transmit_cmd(struct tpm_chip *chip, struct tpm_cmd_t *cmd, |
462 | int len, const char *desc) | |
beed53a1 KJH |
463 | { |
464 | int err; | |
465 | ||
08837438 | 466 | len = tpm_transmit(chip,(u8 *) cmd, len); |
beed53a1 KJH |
467 | if (len < 0) |
468 | return len; | |
469 | if (len == TPM_ERROR_SIZE) { | |
08837438 | 470 | err = be32_to_cpu(cmd->header.out.return_code); |
beed53a1 KJH |
471 | dev_dbg(chip->dev, "A TPM error (%d) occurred %s\n", err, desc); |
472 | return err; | |
473 | } | |
474 | return 0; | |
475 | } | |
476 | ||
08837438 RA |
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 | ||
08e96e48 KJH |
515 | void tpm_gen_interrupt(struct tpm_chip *chip) |
516 | { | |
08837438 | 517 | struct tpm_cmd_t tpm_cmd; |
08e96e48 KJH |
518 | ssize_t rc; |
519 | ||
08837438 RA |
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; | |
08e96e48 | 524 | |
08837438 | 525 | rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 KJH |
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 | { | |
08837438 RA |
532 | struct tpm_cmd_t tpm_cmd; |
533 | struct timeout_t *timeout_cap; | |
534 | struct duration_t *duration_cap; | |
08e96e48 KJH |
535 | ssize_t rc; |
536 | u32 timeout; | |
e3e1a1e1 | 537 | unsigned int scale = 1; |
08e96e48 | 538 | |
08837438 RA |
539 | tpm_cmd.header.in = tpm_getcap_header; |
540 | tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; | |
541 | tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); | |
542 | tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT; | |
08e96e48 | 543 | |
08837438 | 544 | rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 KJH |
545 | "attempting to determine the timeouts"); |
546 | if (rc) | |
547 | goto duration; | |
548 | ||
829bf067 SB |
549 | if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 || |
550 | be32_to_cpu(tpm_cmd.header.out.length) | |
551 | != sizeof(tpm_cmd.header.out) + sizeof(u32) + 4 * sizeof(u32)) | |
552 | return; | |
08e96e48 | 553 | |
08837438 | 554 | timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout; |
08e96e48 | 555 | /* Don't overwrite default if value is 0 */ |
08837438 | 556 | timeout = be32_to_cpu(timeout_cap->a); |
e3e1a1e1 SB |
557 | if (timeout && timeout < 1000) { |
558 | /* timeouts in msec rather usec */ | |
559 | scale = 1000; | |
62592101 | 560 | chip->vendor.timeout_adjusted = true; |
e3e1a1e1 | 561 | } |
08e96e48 | 562 | if (timeout) |
e3e1a1e1 | 563 | chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale); |
08837438 | 564 | timeout = be32_to_cpu(timeout_cap->b); |
08e96e48 | 565 | if (timeout) |
e3e1a1e1 | 566 | chip->vendor.timeout_b = usecs_to_jiffies(timeout * scale); |
08837438 | 567 | timeout = be32_to_cpu(timeout_cap->c); |
08e96e48 | 568 | if (timeout) |
e3e1a1e1 | 569 | chip->vendor.timeout_c = usecs_to_jiffies(timeout * scale); |
08837438 | 570 | timeout = be32_to_cpu(timeout_cap->d); |
08e96e48 | 571 | if (timeout) |
e3e1a1e1 | 572 | chip->vendor.timeout_d = usecs_to_jiffies(timeout * scale); |
08e96e48 KJH |
573 | |
574 | duration: | |
08837438 RA |
575 | tpm_cmd.header.in = tpm_getcap_header; |
576 | tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; | |
577 | tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); | |
578 | tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION; | |
08e96e48 | 579 | |
08837438 | 580 | rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 KJH |
581 | "attempting to determine the durations"); |
582 | if (rc) | |
583 | return; | |
584 | ||
979b1406 SB |
585 | if (be32_to_cpu(tpm_cmd.header.out.return_code) != 0 || |
586 | be32_to_cpu(tpm_cmd.header.out.length) | |
587 | != sizeof(tpm_cmd.header.out) + sizeof(u32) + 3 * sizeof(u32)) | |
08e96e48 | 588 | return; |
979b1406 | 589 | |
08837438 | 590 | duration_cap = &tpm_cmd.params.getcap_out.cap.duration; |
08e96e48 | 591 | chip->vendor.duration[TPM_SHORT] = |
08837438 | 592 | usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short)); |
e934acca SB |
593 | chip->vendor.duration[TPM_MEDIUM] = |
594 | usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium)); | |
595 | chip->vendor.duration[TPM_LONG] = | |
596 | usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long)); | |
597 | ||
292cf4a8 VK |
598 | /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above |
599 | * value wrong and apparently reports msecs rather than usecs. So we | |
600 | * fix up the resulting too-small TPM_SHORT value to make things work. | |
e934acca | 601 | * We also scale the TPM_MEDIUM and -_LONG values by 1000. |
292cf4a8 | 602 | */ |
e934acca | 603 | if (chip->vendor.duration[TPM_SHORT] < (HZ / 100)) { |
292cf4a8 | 604 | chip->vendor.duration[TPM_SHORT] = HZ; |
e934acca SB |
605 | chip->vendor.duration[TPM_MEDIUM] *= 1000; |
606 | chip->vendor.duration[TPM_LONG] *= 1000; | |
04ab2293 | 607 | chip->vendor.duration_adjusted = true; |
e934acca SB |
608 | dev_info(chip->dev, "Adjusting TPM timeout parameters."); |
609 | } | |
08e96e48 KJH |
610 | } |
611 | EXPORT_SYMBOL_GPL(tpm_get_timeouts); | |
612 | ||
613 | void tpm_continue_selftest(struct tpm_chip *chip) | |
614 | { | |
615 | u8 data[] = { | |
616 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
617 | 0, 0, 0, 10, /* length */ | |
c9206693 | 618 | 0, 0, 0, 83, /* TPM_ORD_ContinueSelfTest */ |
08e96e48 KJH |
619 | }; |
620 | ||
621 | tpm_transmit(chip, data, sizeof(data)); | |
622 | } | |
623 | EXPORT_SYMBOL_GPL(tpm_continue_selftest); | |
624 | ||
625 | ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, | |
626 | char *buf) | |
627 | { | |
08837438 | 628 | cap_t cap; |
08e96e48 KJH |
629 | ssize_t rc; |
630 | ||
08837438 RA |
631 | rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap, |
632 | "attempting to determine the permanent enabled state"); | |
633 | if (rc) | |
08e96e48 | 634 | return 0; |
ec288bd3 | 635 | |
08837438 | 636 | rc = sprintf(buf, "%d\n", !cap.perm_flags.disable); |
ec288bd3 | 637 | return rc; |
08e96e48 KJH |
638 | } |
639 | EXPORT_SYMBOL_GPL(tpm_show_enabled); | |
640 | ||
641 | ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr, | |
642 | char *buf) | |
643 | { | |
08837438 | 644 | cap_t cap; |
08e96e48 KJH |
645 | ssize_t rc; |
646 | ||
08837438 RA |
647 | rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap, |
648 | "attempting to determine the permanent active state"); | |
649 | if (rc) | |
08e96e48 | 650 | return 0; |
ec288bd3 | 651 | |
08837438 | 652 | rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated); |
ec288bd3 | 653 | return rc; |
08e96e48 KJH |
654 | } |
655 | EXPORT_SYMBOL_GPL(tpm_show_active); | |
656 | ||
657 | ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr, | |
658 | char *buf) | |
659 | { | |
08837438 | 660 | cap_t cap; |
08e96e48 KJH |
661 | ssize_t rc; |
662 | ||
08837438 RA |
663 | rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap, |
664 | "attempting to determine the owner state"); | |
665 | if (rc) | |
08e96e48 | 666 | return 0; |
ec288bd3 | 667 | |
08837438 | 668 | rc = sprintf(buf, "%d\n", cap.owned); |
ec288bd3 | 669 | return rc; |
08e96e48 KJH |
670 | } |
671 | EXPORT_SYMBOL_GPL(tpm_show_owned); | |
672 | ||
673 | ssize_t tpm_show_temp_deactivated(struct device * dev, | |
674 | struct device_attribute * attr, char *buf) | |
675 | { | |
08837438 | 676 | cap_t cap; |
08e96e48 KJH |
677 | ssize_t rc; |
678 | ||
08837438 RA |
679 | rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap, |
680 | "attempting to determine the temporary state"); | |
681 | if (rc) | |
08e96e48 | 682 | return 0; |
ec288bd3 | 683 | |
08837438 | 684 | rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated); |
ec288bd3 | 685 | return rc; |
08e96e48 KJH |
686 | } |
687 | EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated); | |
688 | ||
659aaf2b RA |
689 | /* |
690 | * tpm_chip_find_get - return tpm_chip for given chip number | |
691 | */ | |
692 | static struct tpm_chip *tpm_chip_find_get(int chip_num) | |
693 | { | |
8920d5ad | 694 | struct tpm_chip *pos, *chip = NULL; |
659aaf2b RA |
695 | |
696 | rcu_read_lock(); | |
697 | list_for_each_entry_rcu(pos, &tpm_chip_list, list) { | |
698 | if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num) | |
699 | continue; | |
700 | ||
8920d5ad RA |
701 | if (try_module_get(pos->dev->driver->owner)) { |
702 | chip = pos; | |
659aaf2b | 703 | break; |
8920d5ad | 704 | } |
659aaf2b RA |
705 | } |
706 | rcu_read_unlock(); | |
8920d5ad | 707 | return chip; |
659aaf2b RA |
708 | } |
709 | ||
710 | #define TPM_ORDINAL_PCRREAD cpu_to_be32(21) | |
711 | #define READ_PCR_RESULT_SIZE 30 | |
712 | static struct tpm_input_header pcrread_header = { | |
713 | .tag = TPM_TAG_RQU_COMMAND, | |
714 | .length = cpu_to_be32(14), | |
715 | .ordinal = TPM_ORDINAL_PCRREAD | |
1da177e4 LT |
716 | }; |
717 | ||
659aaf2b RA |
718 | int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) |
719 | { | |
720 | int rc; | |
721 | struct tpm_cmd_t cmd; | |
722 | ||
723 | cmd.header.in = pcrread_header; | |
724 | cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx); | |
23acb98d | 725 | rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE, |
659aaf2b RA |
726 | "attempting to read a pcr value"); |
727 | ||
728 | if (rc == 0) | |
729 | memcpy(res_buf, cmd.params.pcrread_out.pcr_result, | |
730 | TPM_DIGEST_SIZE); | |
731 | return rc; | |
732 | } | |
733 | ||
734 | /** | |
735 | * tpm_pcr_read - read a pcr value | |
736 | * @chip_num: tpm idx # or ANY | |
737 | * @pcr_idx: pcr idx to retrieve | |
738 | * @res_buf: TPM_PCR value | |
739 | * size of res_buf is 20 bytes (or NULL if you don't care) | |
740 | * | |
741 | * The TPM driver should be built-in, but for whatever reason it | |
742 | * isn't, protect against the chip disappearing, by incrementing | |
743 | * the module usage count. | |
744 | */ | |
745 | int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) | |
746 | { | |
747 | struct tpm_chip *chip; | |
748 | int rc; | |
749 | ||
750 | chip = tpm_chip_find_get(chip_num); | |
751 | if (chip == NULL) | |
752 | return -ENODEV; | |
753 | rc = __tpm_pcr_read(chip, pcr_idx, res_buf); | |
a0e39349 | 754 | tpm_chip_put(chip); |
659aaf2b RA |
755 | return rc; |
756 | } | |
757 | EXPORT_SYMBOL_GPL(tpm_pcr_read); | |
758 | ||
759 | /** | |
760 | * tpm_pcr_extend - extend pcr value with hash | |
761 | * @chip_num: tpm idx # or AN& | |
762 | * @pcr_idx: pcr idx to extend | |
763 | * @hash: hash value used to extend pcr value | |
764 | * | |
765 | * The TPM driver should be built-in, but for whatever reason it | |
766 | * isn't, protect against the chip disappearing, by incrementing | |
767 | * the module usage count. | |
768 | */ | |
769 | #define TPM_ORD_PCR_EXTEND cpu_to_be32(20) | |
0afd9056 | 770 | #define EXTEND_PCR_RESULT_SIZE 34 |
659aaf2b RA |
771 | static struct tpm_input_header pcrextend_header = { |
772 | .tag = TPM_TAG_RQU_COMMAND, | |
773 | .length = cpu_to_be32(34), | |
774 | .ordinal = TPM_ORD_PCR_EXTEND | |
775 | }; | |
776 | ||
777 | int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) | |
778 | { | |
779 | struct tpm_cmd_t cmd; | |
780 | int rc; | |
781 | struct tpm_chip *chip; | |
782 | ||
783 | chip = tpm_chip_find_get(chip_num); | |
784 | if (chip == NULL) | |
785 | return -ENODEV; | |
786 | ||
787 | cmd.header.in = pcrextend_header; | |
659aaf2b RA |
788 | cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx); |
789 | memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE); | |
0afd9056 | 790 | rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, |
659aaf2b RA |
791 | "attempting extend a PCR value"); |
792 | ||
a0e39349 | 793 | tpm_chip_put(chip); |
659aaf2b RA |
794 | return rc; |
795 | } | |
796 | EXPORT_SYMBOL_GPL(tpm_pcr_extend); | |
797 | ||
c749ba91 MZ |
798 | int tpm_send(u32 chip_num, void *cmd, size_t buflen) |
799 | { | |
800 | struct tpm_chip *chip; | |
801 | int rc; | |
802 | ||
803 | chip = tpm_chip_find_get(chip_num); | |
804 | if (chip == NULL) | |
805 | return -ENODEV; | |
806 | ||
807 | rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd"); | |
808 | ||
809 | tpm_chip_put(chip); | |
810 | return rc; | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(tpm_send); | |
813 | ||
6659ca2a KH |
814 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
815 | char *buf) | |
1da177e4 | 816 | { |
08837438 | 817 | cap_t cap; |
659aaf2b | 818 | u8 digest[TPM_DIGEST_SIZE]; |
beed53a1 | 819 | ssize_t rc; |
81179bb6 | 820 | int i, j, num_pcrs; |
1da177e4 | 821 | char *str = buf; |
e659a3fe | 822 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 | 823 | |
08837438 | 824 | rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap, |
beed53a1 | 825 | "attempting to determine the number of PCRS"); |
08837438 | 826 | if (rc) |
e234bc97 | 827 | return 0; |
1da177e4 | 828 | |
08837438 | 829 | num_pcrs = be32_to_cpu(cap.num_pcrs); |
1da177e4 | 830 | for (i = 0; i < num_pcrs; i++) { |
659aaf2b | 831 | rc = __tpm_pcr_read(chip, i, digest); |
beed53a1 | 832 | if (rc) |
08837438 | 833 | break; |
1da177e4 LT |
834 | str += sprintf(str, "PCR-%02d: ", i); |
835 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
659aaf2b | 836 | str += sprintf(str, "%02X ", digest[j]); |
1da177e4 LT |
837 | str += sprintf(str, "\n"); |
838 | } | |
839 | return str - buf; | |
840 | } | |
6659ca2a | 841 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
842 | |
843 | #define READ_PUBEK_RESULT_SIZE 314 | |
08837438 RA |
844 | #define TPM_ORD_READPUBEK cpu_to_be32(124) |
845 | struct tpm_input_header tpm_readpubek_header = { | |
846 | .tag = TPM_TAG_RQU_COMMAND, | |
847 | .length = cpu_to_be32(30), | |
848 | .ordinal = TPM_ORD_READPUBEK | |
1da177e4 LT |
849 | }; |
850 | ||
6659ca2a KH |
851 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
852 | char *buf) | |
1da177e4 | 853 | { |
2df7111f | 854 | u8 *data; |
08837438 | 855 | struct tpm_cmd_t tpm_cmd; |
beed53a1 | 856 | ssize_t err; |
81179bb6 | 857 | int i, rc; |
1da177e4 LT |
858 | char *str = buf; |
859 | ||
e659a3fe | 860 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 | 861 | |
08837438 RA |
862 | tpm_cmd.header.in = tpm_readpubek_header; |
863 | err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, | |
beed53a1 KJH |
864 | "attempting to read the PUBEK"); |
865 | if (err) | |
34d6e075 | 866 | goto out; |
1da177e4 LT |
867 | |
868 | /* | |
869 | ignore header 10 bytes | |
870 | algorithm 32 bits (1 == RSA ) | |
871 | encscheme 16 bits | |
872 | sigscheme 16 bits | |
873 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
874 | keylenbytes 32 bits | |
875 | 256 byte modulus | |
876 | ignore checksum 20 bytes | |
877 | */ | |
08837438 | 878 | data = tpm_cmd.params.readpubek_out_buffer; |
1da177e4 LT |
879 | str += |
880 | sprintf(str, | |
5a79444f SB |
881 | "Algorithm: %02X %02X %02X %02X\n" |
882 | "Encscheme: %02X %02X\n" | |
883 | "Sigscheme: %02X %02X\n" | |
884 | "Parameters: %02X %02X %02X %02X " | |
885 | "%02X %02X %02X %02X " | |
886 | "%02X %02X %02X %02X\n" | |
887 | "Modulus length: %d\n" | |
888 | "Modulus:\n", | |
889 | data[0], data[1], data[2], data[3], | |
890 | data[4], data[5], | |
891 | data[6], data[7], | |
892 | data[12], data[13], data[14], data[15], | |
893 | data[16], data[17], data[18], data[19], | |
894 | data[20], data[21], data[22], data[23], | |
895 | be32_to_cpu(*((__be32 *) (data + 24)))); | |
1da177e4 LT |
896 | |
897 | for (i = 0; i < 256; i++) { | |
5a79444f | 898 | str += sprintf(str, "%02X ", data[i + 28]); |
1da177e4 LT |
899 | if ((i + 1) % 16 == 0) |
900 | str += sprintf(str, "\n"); | |
901 | } | |
34d6e075 | 902 | out: |
beed53a1 | 903 | rc = str - buf; |
2df7111f | 904 | return rc; |
1da177e4 | 905 | } |
6659ca2a | 906 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 | 907 | |
1da177e4 | 908 | |
6659ca2a KH |
909 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
910 | char *buf) | |
1da177e4 | 911 | { |
08837438 | 912 | cap_t cap; |
beed53a1 | 913 | ssize_t rc; |
1da177e4 LT |
914 | char *str = buf; |
915 | ||
08837438 | 916 | rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap, |
beed53a1 | 917 | "attempting to determine the manufacturer"); |
08837438 | 918 | if (rc) |
beed53a1 | 919 | return 0; |
1da177e4 | 920 | str += sprintf(str, "Manufacturer: 0x%x\n", |
08837438 | 921 | be32_to_cpu(cap.manufacturer_id)); |
1da177e4 | 922 | |
08837438 RA |
923 | rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap, |
924 | "attempting to determine the 1.1 version"); | |
beed53a1 | 925 | if (rc) |
08837438 | 926 | return 0; |
beed53a1 KJH |
927 | str += sprintf(str, |
928 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
08837438 RA |
929 | cap.tpm_version.Major, cap.tpm_version.Minor, |
930 | cap.tpm_version.revMajor, cap.tpm_version.revMinor); | |
1da177e4 LT |
931 | return str - buf; |
932 | } | |
6659ca2a KH |
933 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
934 | ||
08e96e48 KJH |
935 | ssize_t tpm_show_caps_1_2(struct device * dev, |
936 | struct device_attribute * attr, char *buf) | |
937 | { | |
08837438 RA |
938 | cap_t cap; |
939 | ssize_t rc; | |
08e96e48 KJH |
940 | char *str = buf; |
941 | ||
08837438 RA |
942 | rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap, |
943 | "attempting to determine the manufacturer"); | |
944 | if (rc) | |
08e96e48 | 945 | return 0; |
08e96e48 | 946 | str += sprintf(str, "Manufacturer: 0x%x\n", |
08837438 RA |
947 | be32_to_cpu(cap.manufacturer_id)); |
948 | rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap, | |
949 | "attempting to determine the 1.2 version"); | |
950 | if (rc) | |
951 | return 0; | |
08e96e48 KJH |
952 | str += sprintf(str, |
953 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
08837438 RA |
954 | cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor, |
955 | cap.tpm_version_1_2.revMajor, | |
956 | cap.tpm_version_1_2.revMinor); | |
08e96e48 KJH |
957 | return str - buf; |
958 | } | |
959 | EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); | |
960 | ||
04ab2293 SB |
961 | ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr, |
962 | char *buf) | |
963 | { | |
964 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
965 | ||
966 | return sprintf(buf, "%d %d %d [%s]\n", | |
967 | jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]), | |
968 | jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]), | |
969 | jiffies_to_usecs(chip->vendor.duration[TPM_LONG]), | |
970 | chip->vendor.duration_adjusted | |
971 | ? "adjusted" : "original"); | |
972 | } | |
973 | EXPORT_SYMBOL_GPL(tpm_show_durations); | |
974 | ||
62592101 SB |
975 | ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr, |
976 | char *buf) | |
977 | { | |
978 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
979 | ||
980 | return sprintf(buf, "%d %d %d %d [%s]\n", | |
981 | jiffies_to_usecs(chip->vendor.timeout_a), | |
982 | jiffies_to_usecs(chip->vendor.timeout_b), | |
983 | jiffies_to_usecs(chip->vendor.timeout_c), | |
984 | jiffies_to_usecs(chip->vendor.timeout_d), | |
985 | chip->vendor.timeout_adjusted | |
986 | ? "adjusted" : "original"); | |
987 | } | |
988 | EXPORT_SYMBOL_GPL(tpm_show_timeouts); | |
989 | ||
6659ca2a KH |
990 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, |
991 | const char *buf, size_t count) | |
992 | { | |
993 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
994 | if (chip == NULL) | |
995 | return 0; | |
996 | ||
90dda520 | 997 | chip->vendor.cancel(chip); |
6659ca2a KH |
998 | return count; |
999 | } | |
1000 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 1001 | |
1da177e4 LT |
1002 | /* |
1003 | * Device file system interface to the TPM | |
f89c5edb RA |
1004 | * |
1005 | * It's assured that the chip will be opened just once, | |
1006 | * by the check of is_open variable, which is protected | |
1007 | * by driver_lock. | |
1da177e4 LT |
1008 | */ |
1009 | int tpm_open(struct inode *inode, struct file *file) | |
1010 | { | |
f02a9364 | 1011 | int minor = iminor(inode); |
1da177e4 LT |
1012 | struct tpm_chip *chip = NULL, *pos; |
1013 | ||
f02a9364 RA |
1014 | rcu_read_lock(); |
1015 | list_for_each_entry_rcu(pos, &tpm_chip_list, list) { | |
90dda520 | 1016 | if (pos->vendor.miscdev.minor == minor) { |
1da177e4 | 1017 | chip = pos; |
f02a9364 | 1018 | get_device(chip->dev); |
1da177e4 LT |
1019 | break; |
1020 | } | |
1021 | } | |
f02a9364 | 1022 | rcu_read_unlock(); |
1da177e4 | 1023 | |
f02a9364 RA |
1024 | if (!chip) |
1025 | return -ENODEV; | |
1da177e4 | 1026 | |
dc36d32c | 1027 | if (test_and_set_bit(0, &chip->is_open)) { |
b888c87b | 1028 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
f02a9364 RA |
1029 | put_device(chip->dev); |
1030 | return -EBUSY; | |
1da177e4 LT |
1031 | } |
1032 | ||
1309d7af | 1033 | chip->data_buffer = kzalloc(TPM_BUFSIZE, GFP_KERNEL); |
1da177e4 | 1034 | if (chip->data_buffer == NULL) { |
dc36d32c | 1035 | clear_bit(0, &chip->is_open); |
e659a3fe | 1036 | put_device(chip->dev); |
1da177e4 LT |
1037 | return -ENOMEM; |
1038 | } | |
1039 | ||
1040 | atomic_set(&chip->data_pending, 0); | |
1041 | ||
1042 | file->private_data = chip; | |
1043 | return 0; | |
1da177e4 | 1044 | } |
1da177e4 LT |
1045 | EXPORT_SYMBOL_GPL(tpm_open); |
1046 | ||
f02a9364 RA |
1047 | /* |
1048 | * Called on file close | |
1049 | */ | |
1da177e4 LT |
1050 | int tpm_release(struct inode *inode, struct file *file) |
1051 | { | |
1052 | struct tpm_chip *chip = file->private_data; | |
1da177e4 | 1053 | |
4bdec11f | 1054 | del_singleshot_timer_sync(&chip->user_read_timer); |
2e5c44c9 | 1055 | flush_work_sync(&chip->work); |
5e976d55 | 1056 | file->private_data = NULL; |
1da177e4 | 1057 | atomic_set(&chip->data_pending, 0); |
f02a9364 | 1058 | kfree(chip->data_buffer); |
dc36d32c | 1059 | clear_bit(0, &chip->is_open); |
e659a3fe | 1060 | put_device(chip->dev); |
1da177e4 LT |
1061 | return 0; |
1062 | } | |
1da177e4 LT |
1063 | EXPORT_SYMBOL_GPL(tpm_release); |
1064 | ||
b888c87b | 1065 | ssize_t tpm_write(struct file *file, const char __user *buf, |
3c2f606a | 1066 | size_t size, loff_t *off) |
1da177e4 LT |
1067 | { |
1068 | struct tpm_chip *chip = file->private_data; | |
01476001 | 1069 | size_t in_size = size, out_size; |
1da177e4 LT |
1070 | |
1071 | /* cannot perform a write until the read has cleared | |
1072 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
1073 | while (atomic_read(&chip->data_pending) != 0) |
1074 | msleep(TPM_TIMEOUT); | |
1da177e4 | 1075 | |
d081d470 | 1076 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
1077 | |
1078 | if (in_size > TPM_BUFSIZE) | |
1079 | in_size = TPM_BUFSIZE; | |
1080 | ||
1081 | if (copy_from_user | |
1082 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
d081d470 | 1083 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1084 | return -EFAULT; |
1085 | } | |
1086 | ||
1087 | /* atomic tpm command send and result receive */ | |
1088 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
1089 | ||
1090 | atomic_set(&chip->data_pending, out_size); | |
d081d470 | 1091 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1092 | |
1093 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 1094 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
1095 | |
1096 | return in_size; | |
1097 | } | |
1da177e4 LT |
1098 | EXPORT_SYMBOL_GPL(tpm_write); |
1099 | ||
3c2f606a KJH |
1100 | ssize_t tpm_read(struct file *file, char __user *buf, |
1101 | size_t size, loff_t *off) | |
1da177e4 LT |
1102 | { |
1103 | struct tpm_chip *chip = file->private_data; | |
01476001 | 1104 | ssize_t ret_size; |
1da177e4 | 1105 | |
5b44bd58 | 1106 | del_singleshot_timer_sync(&chip->user_read_timer); |
2e5c44c9 | 1107 | flush_work_sync(&chip->work); |
5b44bd58 KH |
1108 | ret_size = atomic_read(&chip->data_pending); |
1109 | atomic_set(&chip->data_pending, 0); | |
1110 | if (ret_size > 0) { /* relay data */ | |
1111 | if (size < ret_size) | |
1112 | ret_size = size; | |
1da177e4 | 1113 | |
d081d470 | 1114 | mutex_lock(&chip->buffer_mutex); |
f6a2382c | 1115 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 1116 | ret_size = -EFAULT; |
d081d470 | 1117 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | return ret_size; | |
1121 | } | |
1da177e4 LT |
1122 | EXPORT_SYMBOL_GPL(tpm_read); |
1123 | ||
e659a3fe | 1124 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 1125 | { |
e659a3fe | 1126 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1127 | |
1128 | if (chip == NULL) { | |
e659a3fe | 1129 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
1130 | return; |
1131 | } | |
1132 | ||
1133 | spin_lock(&driver_lock); | |
f02a9364 | 1134 | list_del_rcu(&chip->list); |
1da177e4 | 1135 | spin_unlock(&driver_lock); |
f02a9364 | 1136 | synchronize_rcu(); |
1da177e4 | 1137 | |
90dda520 | 1138 | misc_deregister(&chip->vendor.miscdev); |
90dda520 | 1139 | sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); |
55a82ab3 | 1140 | tpm_bios_log_teardown(chip->bios_dir); |
1da177e4 | 1141 | |
5bd91f18 RM |
1142 | /* write it this way to be explicit (chip->dev == dev) */ |
1143 | put_device(chip->dev); | |
1da177e4 | 1144 | } |
e659a3fe | 1145 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 | 1146 | |
225a9be2 RA |
1147 | #define TPM_ORD_SAVESTATE cpu_to_be32(152) |
1148 | #define SAVESTATE_RESULT_SIZE 10 | |
1149 | ||
1150 | static struct tpm_input_header savestate_header = { | |
1151 | .tag = TPM_TAG_RQU_COMMAND, | |
1152 | .length = cpu_to_be32(10), | |
1153 | .ordinal = TPM_ORD_SAVESTATE | |
1154 | }; | |
1155 | ||
1da177e4 LT |
1156 | /* |
1157 | * We are about to suspend. Save the TPM state | |
1158 | * so that it can be restored. | |
1159 | */ | |
ce2c87d4 | 1160 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 1161 | { |
ce2c87d4 | 1162 | struct tpm_chip *chip = dev_get_drvdata(dev); |
225a9be2 RA |
1163 | struct tpm_cmd_t cmd; |
1164 | int rc; | |
1165 | ||
1166 | u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 }; | |
2490c681 | 1167 | |
1da177e4 LT |
1168 | if (chip == NULL) |
1169 | return -ENODEV; | |
1170 | ||
225a9be2 RA |
1171 | /* for buggy tpm, flush pcrs with extend to selected dummy */ |
1172 | if (tpm_suspend_pcr) { | |
1173 | cmd.header.in = pcrextend_header; | |
1174 | cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr); | |
1175 | memcpy(cmd.params.pcrextend_in.hash, dummy_hash, | |
1176 | TPM_DIGEST_SIZE); | |
1177 | rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, | |
1178 | "extending dummy pcr before suspend"); | |
1179 | } | |
1180 | ||
1181 | /* now do the actual savestate */ | |
1182 | cmd.header.in = savestate_header; | |
1183 | rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, | |
1184 | "sending savestate before suspend"); | |
1185 | return rc; | |
1da177e4 | 1186 | } |
1da177e4 LT |
1187 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); |
1188 | ||
1189 | /* | |
1190 | * Resume from a power safe. The BIOS already restored | |
1191 | * the TPM state. | |
1192 | */ | |
ce2c87d4 | 1193 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 1194 | { |
ce2c87d4 | 1195 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1196 | |
1197 | if (chip == NULL) | |
1198 | return -ENODEV; | |
1199 | ||
1da177e4 LT |
1200 | return 0; |
1201 | } | |
1da177e4 LT |
1202 | EXPORT_SYMBOL_GPL(tpm_pm_resume); |
1203 | ||
253115b7 RA |
1204 | /* In case vendor provided release function, call it too.*/ |
1205 | ||
1206 | void tpm_dev_vendor_release(struct tpm_chip *chip) | |
1207 | { | |
1208 | if (chip->vendor.release) | |
1209 | chip->vendor.release(chip->dev); | |
1210 | ||
1211 | clear_bit(chip->dev_num, dev_mask); | |
1212 | kfree(chip->vendor.miscdev.name); | |
1213 | } | |
1214 | EXPORT_SYMBOL_GPL(tpm_dev_vendor_release); | |
1215 | ||
1216 | ||
5bd91f18 RM |
1217 | /* |
1218 | * Once all references to platform device are down to 0, | |
1219 | * release all allocated structures. | |
5bd91f18 | 1220 | */ |
cbb2ed4a | 1221 | void tpm_dev_release(struct device *dev) |
5bd91f18 RM |
1222 | { |
1223 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
1224 | ||
253115b7 | 1225 | tpm_dev_vendor_release(chip); |
5bd91f18 | 1226 | |
253115b7 | 1227 | chip->release(dev); |
5bd91f18 RM |
1228 | kfree(chip); |
1229 | } | |
253115b7 | 1230 | EXPORT_SYMBOL_GPL(tpm_dev_release); |
5bd91f18 | 1231 | |
1da177e4 LT |
1232 | /* |
1233 | * Called from tpm_<specific>.c probe function only for devices | |
1234 | * the driver has determined it should claim. Prior to calling | |
1235 | * this function the specific probe function has called pci_enable_device | |
1236 | * upon errant exit from this function specific probe function should call | |
1237 | * pci_disable_device | |
1238 | */ | |
f02a9364 RA |
1239 | struct tpm_chip *tpm_register_hardware(struct device *dev, |
1240 | const struct tpm_vendor_specific *entry) | |
1da177e4 | 1241 | { |
6f9beccb KJH |
1242 | #define DEVNAME_SIZE 7 |
1243 | ||
1244 | char *devname; | |
1da177e4 | 1245 | struct tpm_chip *chip; |
1da177e4 LT |
1246 | |
1247 | /* Driver specific per-device data */ | |
b888c87b | 1248 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
8e39c933 PW |
1249 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
1250 | ||
dd78c943 AM |
1251 | if (chip == NULL || devname == NULL) |
1252 | goto out_free; | |
1da177e4 | 1253 | |
d081d470 MK |
1254 | mutex_init(&chip->buffer_mutex); |
1255 | mutex_init(&chip->tpm_mutex); | |
1da177e4 LT |
1256 | INIT_LIST_HEAD(&chip->list); |
1257 | ||
c4028958 | 1258 | INIT_WORK(&chip->work, timeout_work); |
09e12f9f | 1259 | |
40565f19 JS |
1260 | setup_timer(&chip->user_read_timer, user_reader_timeout, |
1261 | (unsigned long)chip); | |
fe3fd483 | 1262 | |
90dda520 | 1263 | memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); |
1da177e4 | 1264 | |
10685a95 | 1265 | chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 1266 | |
10685a95 | 1267 | if (chip->dev_num >= TPM_NUM_DEVICES) { |
b888c87b | 1268 | dev_err(dev, "No available tpm device numbers\n"); |
dd78c943 | 1269 | goto out_free; |
1da177e4 | 1270 | } else if (chip->dev_num == 0) |
90dda520 | 1271 | chip->vendor.miscdev.minor = TPM_MINOR; |
1da177e4 | 1272 | else |
90dda520 | 1273 | chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; |
1da177e4 | 1274 | |
10685a95 KJH |
1275 | set_bit(chip->dev_num, dev_mask); |
1276 | ||
6f9beccb | 1277 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); |
90dda520 | 1278 | chip->vendor.miscdev.name = devname; |
1da177e4 | 1279 | |
94fbcded | 1280 | chip->vendor.miscdev.parent = dev; |
e659a3fe | 1281 | chip->dev = get_device(dev); |
5bd91f18 RM |
1282 | chip->release = dev->release; |
1283 | dev->release = tpm_dev_release; | |
1284 | dev_set_drvdata(dev, chip); | |
1da177e4 | 1285 | |
90dda520 | 1286 | if (misc_register(&chip->vendor.miscdev)) { |
e659a3fe | 1287 | dev_err(chip->dev, |
1da177e4 | 1288 | "unable to misc_register %s, minor %d\n", |
90dda520 KJH |
1289 | chip->vendor.miscdev.name, |
1290 | chip->vendor.miscdev.minor); | |
5bd91f18 | 1291 | put_device(chip->dev); |
e0dd03ca | 1292 | return NULL; |
1da177e4 LT |
1293 | } |
1294 | ||
f33d9bd5 | 1295 | if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { |
5d469ec0 | 1296 | misc_deregister(&chip->vendor.miscdev); |
5bd91f18 | 1297 | put_device(chip->dev); |
f02a9364 | 1298 | |
f33d9bd5 JG |
1299 | return NULL; |
1300 | } | |
1da177e4 | 1301 | |
55a82ab3 KJH |
1302 | chip->bios_dir = tpm_bios_log_setup(devname); |
1303 | ||
f02a9364 RA |
1304 | /* Make chip available */ |
1305 | spin_lock(&driver_lock); | |
1306 | list_add_rcu(&chip->list, &tpm_chip_list); | |
1307 | spin_unlock(&driver_lock); | |
1308 | ||
e0dd03ca | 1309 | return chip; |
dd78c943 AM |
1310 | |
1311 | out_free: | |
1312 | kfree(chip); | |
1313 | kfree(devname); | |
1314 | return NULL; | |
1da177e4 | 1315 | } |
1da177e4 LT |
1316 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
1317 | ||
1da177e4 LT |
1318 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
1319 | MODULE_DESCRIPTION("TPM Driver"); | |
1320 | MODULE_VERSION("2.0"); | |
1321 | MODULE_LICENSE("GPL"); |