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; | |
537 | ||
08837438 RA |
538 | tpm_cmd.header.in = tpm_getcap_header; |
539 | tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; | |
540 | tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); | |
541 | tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_TIMEOUT; | |
08e96e48 | 542 | |
08837438 | 543 | rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 KJH |
544 | "attempting to determine the timeouts"); |
545 | if (rc) | |
546 | goto duration; | |
547 | ||
08837438 | 548 | if (be32_to_cpu(tpm_cmd.header.out.length) |
08e96e48 KJH |
549 | != 4 * sizeof(u32)) |
550 | goto duration; | |
551 | ||
08837438 | 552 | timeout_cap = &tpm_cmd.params.getcap_out.cap.timeout; |
08e96e48 | 553 | /* Don't overwrite default if value is 0 */ |
08837438 | 554 | timeout = be32_to_cpu(timeout_cap->a); |
08e96e48 | 555 | if (timeout) |
9e5b1b12 | 556 | chip->vendor.timeout_a = usecs_to_jiffies(timeout); |
08837438 | 557 | timeout = be32_to_cpu(timeout_cap->b); |
08e96e48 | 558 | if (timeout) |
9e5b1b12 | 559 | chip->vendor.timeout_b = usecs_to_jiffies(timeout); |
08837438 | 560 | timeout = be32_to_cpu(timeout_cap->c); |
08e96e48 | 561 | if (timeout) |
9e5b1b12 | 562 | chip->vendor.timeout_c = usecs_to_jiffies(timeout); |
08837438 | 563 | timeout = be32_to_cpu(timeout_cap->d); |
08e96e48 | 564 | if (timeout) |
9e5b1b12 | 565 | chip->vendor.timeout_d = usecs_to_jiffies(timeout); |
08e96e48 KJH |
566 | |
567 | duration: | |
08837438 RA |
568 | tpm_cmd.header.in = tpm_getcap_header; |
569 | tpm_cmd.params.getcap_in.cap = TPM_CAP_PROP; | |
570 | tpm_cmd.params.getcap_in.subcap_size = cpu_to_be32(4); | |
571 | tpm_cmd.params.getcap_in.subcap = TPM_CAP_PROP_TIS_DURATION; | |
08e96e48 | 572 | |
08837438 | 573 | rc = transmit_cmd(chip, &tpm_cmd, TPM_INTERNAL_RESULT_SIZE, |
08e96e48 KJH |
574 | "attempting to determine the durations"); |
575 | if (rc) | |
576 | return; | |
577 | ||
e5871372 LT |
578 | if (be32_to_cpu(tpm_cmd.header.out.return_code) |
579 | != 3 * sizeof(u32)) | |
08e96e48 | 580 | return; |
08837438 | 581 | duration_cap = &tpm_cmd.params.getcap_out.cap.duration; |
08e96e48 | 582 | chip->vendor.duration[TPM_SHORT] = |
08837438 | 583 | usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_short)); |
292cf4a8 VK |
584 | /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above |
585 | * value wrong and apparently reports msecs rather than usecs. So we | |
586 | * fix up the resulting too-small TPM_SHORT value to make things work. | |
587 | */ | |
588 | if (chip->vendor.duration[TPM_SHORT] < (HZ/100)) | |
589 | chip->vendor.duration[TPM_SHORT] = HZ; | |
590 | ||
08e96e48 | 591 | chip->vendor.duration[TPM_MEDIUM] = |
08837438 | 592 | usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_medium)); |
08e96e48 | 593 | chip->vendor.duration[TPM_LONG] = |
08837438 | 594 | usecs_to_jiffies(be32_to_cpu(duration_cap->tpm_long)); |
08e96e48 KJH |
595 | } |
596 | EXPORT_SYMBOL_GPL(tpm_get_timeouts); | |
597 | ||
598 | void tpm_continue_selftest(struct tpm_chip *chip) | |
599 | { | |
600 | u8 data[] = { | |
601 | 0, 193, /* TPM_TAG_RQU_COMMAND */ | |
602 | 0, 0, 0, 10, /* length */ | |
603 | 0, 0, 0, 83, /* TPM_ORD_GetCapability */ | |
604 | }; | |
605 | ||
606 | tpm_transmit(chip, data, sizeof(data)); | |
607 | } | |
608 | EXPORT_SYMBOL_GPL(tpm_continue_selftest); | |
609 | ||
610 | ssize_t tpm_show_enabled(struct device * dev, struct device_attribute * attr, | |
611 | char *buf) | |
612 | { | |
08837438 | 613 | cap_t cap; |
08e96e48 KJH |
614 | ssize_t rc; |
615 | ||
08837438 RA |
616 | rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap, |
617 | "attempting to determine the permanent enabled state"); | |
618 | if (rc) | |
08e96e48 | 619 | return 0; |
ec288bd3 | 620 | |
08837438 | 621 | rc = sprintf(buf, "%d\n", !cap.perm_flags.disable); |
ec288bd3 | 622 | return rc; |
08e96e48 KJH |
623 | } |
624 | EXPORT_SYMBOL_GPL(tpm_show_enabled); | |
625 | ||
626 | ssize_t tpm_show_active(struct device * dev, struct device_attribute * attr, | |
627 | char *buf) | |
628 | { | |
08837438 | 629 | cap_t cap; |
08e96e48 KJH |
630 | ssize_t rc; |
631 | ||
08837438 RA |
632 | rc = tpm_getcap(dev, TPM_CAP_FLAG_PERM, &cap, |
633 | "attempting to determine the permanent active state"); | |
634 | if (rc) | |
08e96e48 | 635 | return 0; |
ec288bd3 | 636 | |
08837438 | 637 | rc = sprintf(buf, "%d\n", !cap.perm_flags.deactivated); |
ec288bd3 | 638 | return rc; |
08e96e48 KJH |
639 | } |
640 | EXPORT_SYMBOL_GPL(tpm_show_active); | |
641 | ||
642 | ssize_t tpm_show_owned(struct device * dev, struct device_attribute * attr, | |
643 | char *buf) | |
644 | { | |
08837438 | 645 | cap_t cap; |
08e96e48 KJH |
646 | ssize_t rc; |
647 | ||
08837438 RA |
648 | rc = tpm_getcap(dev, TPM_CAP_PROP_OWNER, &cap, |
649 | "attempting to determine the owner state"); | |
650 | if (rc) | |
08e96e48 | 651 | return 0; |
ec288bd3 | 652 | |
08837438 | 653 | rc = sprintf(buf, "%d\n", cap.owned); |
ec288bd3 | 654 | return rc; |
08e96e48 KJH |
655 | } |
656 | EXPORT_SYMBOL_GPL(tpm_show_owned); | |
657 | ||
658 | ssize_t tpm_show_temp_deactivated(struct device * dev, | |
659 | struct device_attribute * attr, char *buf) | |
660 | { | |
08837438 | 661 | cap_t cap; |
08e96e48 KJH |
662 | ssize_t rc; |
663 | ||
08837438 RA |
664 | rc = tpm_getcap(dev, TPM_CAP_FLAG_VOL, &cap, |
665 | "attempting to determine the temporary state"); | |
666 | if (rc) | |
08e96e48 | 667 | return 0; |
ec288bd3 | 668 | |
08837438 | 669 | rc = sprintf(buf, "%d\n", cap.stclear_flags.deactivated); |
ec288bd3 | 670 | return rc; |
08e96e48 KJH |
671 | } |
672 | EXPORT_SYMBOL_GPL(tpm_show_temp_deactivated); | |
673 | ||
659aaf2b RA |
674 | /* |
675 | * tpm_chip_find_get - return tpm_chip for given chip number | |
676 | */ | |
677 | static struct tpm_chip *tpm_chip_find_get(int chip_num) | |
678 | { | |
8920d5ad | 679 | struct tpm_chip *pos, *chip = NULL; |
659aaf2b RA |
680 | |
681 | rcu_read_lock(); | |
682 | list_for_each_entry_rcu(pos, &tpm_chip_list, list) { | |
683 | if (chip_num != TPM_ANY_NUM && chip_num != pos->dev_num) | |
684 | continue; | |
685 | ||
8920d5ad RA |
686 | if (try_module_get(pos->dev->driver->owner)) { |
687 | chip = pos; | |
659aaf2b | 688 | break; |
8920d5ad | 689 | } |
659aaf2b RA |
690 | } |
691 | rcu_read_unlock(); | |
8920d5ad | 692 | return chip; |
659aaf2b RA |
693 | } |
694 | ||
695 | #define TPM_ORDINAL_PCRREAD cpu_to_be32(21) | |
696 | #define READ_PCR_RESULT_SIZE 30 | |
697 | static struct tpm_input_header pcrread_header = { | |
698 | .tag = TPM_TAG_RQU_COMMAND, | |
699 | .length = cpu_to_be32(14), | |
700 | .ordinal = TPM_ORDINAL_PCRREAD | |
1da177e4 LT |
701 | }; |
702 | ||
659aaf2b RA |
703 | int __tpm_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf) |
704 | { | |
705 | int rc; | |
706 | struct tpm_cmd_t cmd; | |
707 | ||
708 | cmd.header.in = pcrread_header; | |
709 | cmd.params.pcrread_in.pcr_idx = cpu_to_be32(pcr_idx); | |
23acb98d | 710 | rc = transmit_cmd(chip, &cmd, READ_PCR_RESULT_SIZE, |
659aaf2b RA |
711 | "attempting to read a pcr value"); |
712 | ||
713 | if (rc == 0) | |
714 | memcpy(res_buf, cmd.params.pcrread_out.pcr_result, | |
715 | TPM_DIGEST_SIZE); | |
716 | return rc; | |
717 | } | |
718 | ||
719 | /** | |
720 | * tpm_pcr_read - read a pcr value | |
721 | * @chip_num: tpm idx # or ANY | |
722 | * @pcr_idx: pcr idx to retrieve | |
723 | * @res_buf: TPM_PCR value | |
724 | * size of res_buf is 20 bytes (or NULL if you don't care) | |
725 | * | |
726 | * The TPM driver should be built-in, but for whatever reason it | |
727 | * isn't, protect against the chip disappearing, by incrementing | |
728 | * the module usage count. | |
729 | */ | |
730 | int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) | |
731 | { | |
732 | struct tpm_chip *chip; | |
733 | int rc; | |
734 | ||
735 | chip = tpm_chip_find_get(chip_num); | |
736 | if (chip == NULL) | |
737 | return -ENODEV; | |
738 | rc = __tpm_pcr_read(chip, pcr_idx, res_buf); | |
a0e39349 | 739 | tpm_chip_put(chip); |
659aaf2b RA |
740 | return rc; |
741 | } | |
742 | EXPORT_SYMBOL_GPL(tpm_pcr_read); | |
743 | ||
744 | /** | |
745 | * tpm_pcr_extend - extend pcr value with hash | |
746 | * @chip_num: tpm idx # or AN& | |
747 | * @pcr_idx: pcr idx to extend | |
748 | * @hash: hash value used to extend pcr value | |
749 | * | |
750 | * The TPM driver should be built-in, but for whatever reason it | |
751 | * isn't, protect against the chip disappearing, by incrementing | |
752 | * the module usage count. | |
753 | */ | |
754 | #define TPM_ORD_PCR_EXTEND cpu_to_be32(20) | |
0afd9056 | 755 | #define EXTEND_PCR_RESULT_SIZE 34 |
659aaf2b RA |
756 | static struct tpm_input_header pcrextend_header = { |
757 | .tag = TPM_TAG_RQU_COMMAND, | |
758 | .length = cpu_to_be32(34), | |
759 | .ordinal = TPM_ORD_PCR_EXTEND | |
760 | }; | |
761 | ||
762 | int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) | |
763 | { | |
764 | struct tpm_cmd_t cmd; | |
765 | int rc; | |
766 | struct tpm_chip *chip; | |
767 | ||
768 | chip = tpm_chip_find_get(chip_num); | |
769 | if (chip == NULL) | |
770 | return -ENODEV; | |
771 | ||
772 | cmd.header.in = pcrextend_header; | |
659aaf2b RA |
773 | cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(pcr_idx); |
774 | memcpy(cmd.params.pcrextend_in.hash, hash, TPM_DIGEST_SIZE); | |
0afd9056 | 775 | rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, |
659aaf2b RA |
776 | "attempting extend a PCR value"); |
777 | ||
a0e39349 | 778 | tpm_chip_put(chip); |
659aaf2b RA |
779 | return rc; |
780 | } | |
781 | EXPORT_SYMBOL_GPL(tpm_pcr_extend); | |
782 | ||
c749ba91 MZ |
783 | int tpm_send(u32 chip_num, void *cmd, size_t buflen) |
784 | { | |
785 | struct tpm_chip *chip; | |
786 | int rc; | |
787 | ||
788 | chip = tpm_chip_find_get(chip_num); | |
789 | if (chip == NULL) | |
790 | return -ENODEV; | |
791 | ||
792 | rc = transmit_cmd(chip, cmd, buflen, "attempting tpm_cmd"); | |
793 | ||
794 | tpm_chip_put(chip); | |
795 | return rc; | |
796 | } | |
797 | EXPORT_SYMBOL_GPL(tpm_send); | |
798 | ||
6659ca2a KH |
799 | ssize_t tpm_show_pcrs(struct device *dev, struct device_attribute *attr, |
800 | char *buf) | |
1da177e4 | 801 | { |
08837438 | 802 | cap_t cap; |
659aaf2b | 803 | u8 digest[TPM_DIGEST_SIZE]; |
beed53a1 | 804 | ssize_t rc; |
81179bb6 | 805 | int i, j, num_pcrs; |
1da177e4 | 806 | char *str = buf; |
e659a3fe | 807 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 | 808 | |
08837438 | 809 | rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap, |
beed53a1 | 810 | "attempting to determine the number of PCRS"); |
08837438 | 811 | if (rc) |
e234bc97 | 812 | return 0; |
1da177e4 | 813 | |
08837438 | 814 | num_pcrs = be32_to_cpu(cap.num_pcrs); |
1da177e4 | 815 | for (i = 0; i < num_pcrs; i++) { |
659aaf2b | 816 | rc = __tpm_pcr_read(chip, i, digest); |
beed53a1 | 817 | if (rc) |
08837438 | 818 | break; |
1da177e4 LT |
819 | str += sprintf(str, "PCR-%02d: ", i); |
820 | for (j = 0; j < TPM_DIGEST_SIZE; j++) | |
659aaf2b | 821 | str += sprintf(str, "%02X ", digest[j]); |
1da177e4 LT |
822 | str += sprintf(str, "\n"); |
823 | } | |
824 | return str - buf; | |
825 | } | |
6659ca2a | 826 | EXPORT_SYMBOL_GPL(tpm_show_pcrs); |
1da177e4 LT |
827 | |
828 | #define READ_PUBEK_RESULT_SIZE 314 | |
08837438 RA |
829 | #define TPM_ORD_READPUBEK cpu_to_be32(124) |
830 | struct tpm_input_header tpm_readpubek_header = { | |
831 | .tag = TPM_TAG_RQU_COMMAND, | |
832 | .length = cpu_to_be32(30), | |
833 | .ordinal = TPM_ORD_READPUBEK | |
1da177e4 LT |
834 | }; |
835 | ||
6659ca2a KH |
836 | ssize_t tpm_show_pubek(struct device *dev, struct device_attribute *attr, |
837 | char *buf) | |
1da177e4 | 838 | { |
2df7111f | 839 | u8 *data; |
08837438 | 840 | struct tpm_cmd_t tpm_cmd; |
beed53a1 | 841 | ssize_t err; |
81179bb6 | 842 | int i, rc; |
1da177e4 LT |
843 | char *str = buf; |
844 | ||
e659a3fe | 845 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 | 846 | |
08837438 RA |
847 | tpm_cmd.header.in = tpm_readpubek_header; |
848 | err = transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE, | |
beed53a1 KJH |
849 | "attempting to read the PUBEK"); |
850 | if (err) | |
34d6e075 | 851 | goto out; |
1da177e4 LT |
852 | |
853 | /* | |
854 | ignore header 10 bytes | |
855 | algorithm 32 bits (1 == RSA ) | |
856 | encscheme 16 bits | |
857 | sigscheme 16 bits | |
858 | parameters (RSA 12->bytes: keybit, #primes, expbit) | |
859 | keylenbytes 32 bits | |
860 | 256 byte modulus | |
861 | ignore checksum 20 bytes | |
862 | */ | |
08837438 | 863 | data = tpm_cmd.params.readpubek_out_buffer; |
1da177e4 LT |
864 | str += |
865 | sprintf(str, | |
866 | "Algorithm: %02X %02X %02X %02X\nEncscheme: %02X %02X\n" | |
867 | "Sigscheme: %02X %02X\nParameters: %02X %02X %02X %02X" | |
868 | " %02X %02X %02X %02X %02X %02X %02X %02X\n" | |
869 | "Modulus length: %d\nModulus: \n", | |
870 | data[10], data[11], data[12], data[13], data[14], | |
871 | data[15], data[16], data[17], data[22], data[23], | |
872 | data[24], data[25], data[26], data[27], data[28], | |
873 | data[29], data[30], data[31], data[32], data[33], | |
1dda8abe | 874 | be32_to_cpu(*((__be32 *) (data + 34)))); |
1da177e4 LT |
875 | |
876 | for (i = 0; i < 256; i++) { | |
1dda8abe | 877 | str += sprintf(str, "%02X ", data[i + 38]); |
1da177e4 LT |
878 | if ((i + 1) % 16 == 0) |
879 | str += sprintf(str, "\n"); | |
880 | } | |
34d6e075 | 881 | out: |
beed53a1 | 882 | rc = str - buf; |
2df7111f | 883 | return rc; |
1da177e4 | 884 | } |
6659ca2a | 885 | EXPORT_SYMBOL_GPL(tpm_show_pubek); |
1da177e4 | 886 | |
1da177e4 | 887 | |
6659ca2a KH |
888 | ssize_t tpm_show_caps(struct device *dev, struct device_attribute *attr, |
889 | char *buf) | |
1da177e4 | 890 | { |
08837438 | 891 | cap_t cap; |
beed53a1 | 892 | ssize_t rc; |
1da177e4 LT |
893 | char *str = buf; |
894 | ||
08837438 | 895 | rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap, |
beed53a1 | 896 | "attempting to determine the manufacturer"); |
08837438 | 897 | if (rc) |
beed53a1 | 898 | return 0; |
1da177e4 | 899 | str += sprintf(str, "Manufacturer: 0x%x\n", |
08837438 | 900 | be32_to_cpu(cap.manufacturer_id)); |
1da177e4 | 901 | |
08837438 RA |
902 | rc = tpm_getcap(dev, CAP_VERSION_1_1, &cap, |
903 | "attempting to determine the 1.1 version"); | |
beed53a1 | 904 | if (rc) |
08837438 | 905 | return 0; |
beed53a1 KJH |
906 | str += sprintf(str, |
907 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
08837438 RA |
908 | cap.tpm_version.Major, cap.tpm_version.Minor, |
909 | cap.tpm_version.revMajor, cap.tpm_version.revMinor); | |
1da177e4 LT |
910 | return str - buf; |
911 | } | |
6659ca2a KH |
912 | EXPORT_SYMBOL_GPL(tpm_show_caps); |
913 | ||
08e96e48 KJH |
914 | ssize_t tpm_show_caps_1_2(struct device * dev, |
915 | struct device_attribute * attr, char *buf) | |
916 | { | |
08837438 RA |
917 | cap_t cap; |
918 | ssize_t rc; | |
08e96e48 KJH |
919 | char *str = buf; |
920 | ||
08837438 RA |
921 | rc = tpm_getcap(dev, TPM_CAP_PROP_MANUFACTURER, &cap, |
922 | "attempting to determine the manufacturer"); | |
923 | if (rc) | |
08e96e48 | 924 | return 0; |
08e96e48 | 925 | str += sprintf(str, "Manufacturer: 0x%x\n", |
08837438 RA |
926 | be32_to_cpu(cap.manufacturer_id)); |
927 | rc = tpm_getcap(dev, CAP_VERSION_1_2, &cap, | |
928 | "attempting to determine the 1.2 version"); | |
929 | if (rc) | |
930 | return 0; | |
08e96e48 KJH |
931 | str += sprintf(str, |
932 | "TCG version: %d.%d\nFirmware version: %d.%d\n", | |
08837438 RA |
933 | cap.tpm_version_1_2.Major, cap.tpm_version_1_2.Minor, |
934 | cap.tpm_version_1_2.revMajor, | |
935 | cap.tpm_version_1_2.revMinor); | |
08e96e48 KJH |
936 | return str - buf; |
937 | } | |
938 | EXPORT_SYMBOL_GPL(tpm_show_caps_1_2); | |
939 | ||
6659ca2a KH |
940 | ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr, |
941 | const char *buf, size_t count) | |
942 | { | |
943 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
944 | if (chip == NULL) | |
945 | return 0; | |
946 | ||
90dda520 | 947 | chip->vendor.cancel(chip); |
6659ca2a KH |
948 | return count; |
949 | } | |
950 | EXPORT_SYMBOL_GPL(tpm_store_cancel); | |
1da177e4 | 951 | |
1da177e4 LT |
952 | /* |
953 | * Device file system interface to the TPM | |
f89c5edb RA |
954 | * |
955 | * It's assured that the chip will be opened just once, | |
956 | * by the check of is_open variable, which is protected | |
957 | * by driver_lock. | |
1da177e4 LT |
958 | */ |
959 | int tpm_open(struct inode *inode, struct file *file) | |
960 | { | |
f02a9364 | 961 | int minor = iminor(inode); |
1da177e4 LT |
962 | struct tpm_chip *chip = NULL, *pos; |
963 | ||
f02a9364 RA |
964 | rcu_read_lock(); |
965 | list_for_each_entry_rcu(pos, &tpm_chip_list, list) { | |
90dda520 | 966 | if (pos->vendor.miscdev.minor == minor) { |
1da177e4 | 967 | chip = pos; |
f02a9364 | 968 | get_device(chip->dev); |
1da177e4 LT |
969 | break; |
970 | } | |
971 | } | |
f02a9364 | 972 | rcu_read_unlock(); |
1da177e4 | 973 | |
f02a9364 RA |
974 | if (!chip) |
975 | return -ENODEV; | |
1da177e4 | 976 | |
dc36d32c | 977 | if (test_and_set_bit(0, &chip->is_open)) { |
b888c87b | 978 | dev_dbg(chip->dev, "Another process owns this TPM\n"); |
f02a9364 RA |
979 | put_device(chip->dev); |
980 | return -EBUSY; | |
1da177e4 LT |
981 | } |
982 | ||
1da177e4 LT |
983 | chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); |
984 | if (chip->data_buffer == NULL) { | |
dc36d32c | 985 | clear_bit(0, &chip->is_open); |
e659a3fe | 986 | put_device(chip->dev); |
1da177e4 LT |
987 | return -ENOMEM; |
988 | } | |
989 | ||
990 | atomic_set(&chip->data_pending, 0); | |
991 | ||
992 | file->private_data = chip; | |
993 | return 0; | |
1da177e4 | 994 | } |
1da177e4 LT |
995 | EXPORT_SYMBOL_GPL(tpm_open); |
996 | ||
f02a9364 RA |
997 | /* |
998 | * Called on file close | |
999 | */ | |
1da177e4 LT |
1000 | int tpm_release(struct inode *inode, struct file *file) |
1001 | { | |
1002 | struct tpm_chip *chip = file->private_data; | |
1da177e4 | 1003 | |
4bdec11f | 1004 | del_singleshot_timer_sync(&chip->user_read_timer); |
2e5c44c9 | 1005 | flush_work_sync(&chip->work); |
5e976d55 | 1006 | file->private_data = NULL; |
1da177e4 | 1007 | atomic_set(&chip->data_pending, 0); |
f02a9364 | 1008 | kfree(chip->data_buffer); |
dc36d32c | 1009 | clear_bit(0, &chip->is_open); |
e659a3fe | 1010 | put_device(chip->dev); |
1da177e4 LT |
1011 | return 0; |
1012 | } | |
1da177e4 LT |
1013 | EXPORT_SYMBOL_GPL(tpm_release); |
1014 | ||
b888c87b | 1015 | ssize_t tpm_write(struct file *file, const char __user *buf, |
3c2f606a | 1016 | size_t size, loff_t *off) |
1da177e4 LT |
1017 | { |
1018 | struct tpm_chip *chip = file->private_data; | |
01476001 | 1019 | size_t in_size = size, out_size; |
1da177e4 LT |
1020 | |
1021 | /* cannot perform a write until the read has cleared | |
1022 | either via tpm_read or a user_read_timer timeout */ | |
700d8bdc NA |
1023 | while (atomic_read(&chip->data_pending) != 0) |
1024 | msleep(TPM_TIMEOUT); | |
1da177e4 | 1025 | |
d081d470 | 1026 | mutex_lock(&chip->buffer_mutex); |
1da177e4 LT |
1027 | |
1028 | if (in_size > TPM_BUFSIZE) | |
1029 | in_size = TPM_BUFSIZE; | |
1030 | ||
1031 | if (copy_from_user | |
1032 | (chip->data_buffer, (void __user *) buf, in_size)) { | |
d081d470 | 1033 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1034 | return -EFAULT; |
1035 | } | |
1036 | ||
1037 | /* atomic tpm command send and result receive */ | |
1038 | out_size = tpm_transmit(chip, chip->data_buffer, TPM_BUFSIZE); | |
1039 | ||
1040 | atomic_set(&chip->data_pending, out_size); | |
d081d470 | 1041 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1042 | |
1043 | /* Set a timeout by which the reader must come claim the result */ | |
fe3fd483 | 1044 | mod_timer(&chip->user_read_timer, jiffies + (60 * HZ)); |
1da177e4 LT |
1045 | |
1046 | return in_size; | |
1047 | } | |
1da177e4 LT |
1048 | EXPORT_SYMBOL_GPL(tpm_write); |
1049 | ||
3c2f606a KJH |
1050 | ssize_t tpm_read(struct file *file, char __user *buf, |
1051 | size_t size, loff_t *off) | |
1da177e4 LT |
1052 | { |
1053 | struct tpm_chip *chip = file->private_data; | |
01476001 | 1054 | ssize_t ret_size; |
1da177e4 | 1055 | |
5b44bd58 | 1056 | del_singleshot_timer_sync(&chip->user_read_timer); |
2e5c44c9 | 1057 | flush_work_sync(&chip->work); |
5b44bd58 KH |
1058 | ret_size = atomic_read(&chip->data_pending); |
1059 | atomic_set(&chip->data_pending, 0); | |
1060 | if (ret_size > 0) { /* relay data */ | |
1061 | if (size < ret_size) | |
1062 | ret_size = size; | |
1da177e4 | 1063 | |
d081d470 | 1064 | mutex_lock(&chip->buffer_mutex); |
f6a2382c | 1065 | if (copy_to_user(buf, chip->data_buffer, ret_size)) |
5b44bd58 | 1066 | ret_size = -EFAULT; |
d081d470 | 1067 | mutex_unlock(&chip->buffer_mutex); |
1da177e4 LT |
1068 | } |
1069 | ||
1070 | return ret_size; | |
1071 | } | |
1da177e4 LT |
1072 | EXPORT_SYMBOL_GPL(tpm_read); |
1073 | ||
e659a3fe | 1074 | void tpm_remove_hardware(struct device *dev) |
1da177e4 | 1075 | { |
e659a3fe | 1076 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1077 | |
1078 | if (chip == NULL) { | |
e659a3fe | 1079 | dev_err(dev, "No device data found\n"); |
1da177e4 LT |
1080 | return; |
1081 | } | |
1082 | ||
1083 | spin_lock(&driver_lock); | |
f02a9364 | 1084 | list_del_rcu(&chip->list); |
1da177e4 | 1085 | spin_unlock(&driver_lock); |
f02a9364 | 1086 | synchronize_rcu(); |
1da177e4 | 1087 | |
90dda520 | 1088 | misc_deregister(&chip->vendor.miscdev); |
90dda520 | 1089 | sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); |
55a82ab3 | 1090 | tpm_bios_log_teardown(chip->bios_dir); |
1da177e4 | 1091 | |
5bd91f18 RM |
1092 | /* write it this way to be explicit (chip->dev == dev) */ |
1093 | put_device(chip->dev); | |
1da177e4 | 1094 | } |
e659a3fe | 1095 | EXPORT_SYMBOL_GPL(tpm_remove_hardware); |
1da177e4 | 1096 | |
225a9be2 RA |
1097 | #define TPM_ORD_SAVESTATE cpu_to_be32(152) |
1098 | #define SAVESTATE_RESULT_SIZE 10 | |
1099 | ||
1100 | static struct tpm_input_header savestate_header = { | |
1101 | .tag = TPM_TAG_RQU_COMMAND, | |
1102 | .length = cpu_to_be32(10), | |
1103 | .ordinal = TPM_ORD_SAVESTATE | |
1104 | }; | |
1105 | ||
1da177e4 LT |
1106 | /* |
1107 | * We are about to suspend. Save the TPM state | |
1108 | * so that it can be restored. | |
1109 | */ | |
ce2c87d4 | 1110 | int tpm_pm_suspend(struct device *dev, pm_message_t pm_state) |
1da177e4 | 1111 | { |
ce2c87d4 | 1112 | struct tpm_chip *chip = dev_get_drvdata(dev); |
225a9be2 RA |
1113 | struct tpm_cmd_t cmd; |
1114 | int rc; | |
1115 | ||
1116 | u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 }; | |
2490c681 | 1117 | |
1da177e4 LT |
1118 | if (chip == NULL) |
1119 | return -ENODEV; | |
1120 | ||
225a9be2 RA |
1121 | /* for buggy tpm, flush pcrs with extend to selected dummy */ |
1122 | if (tpm_suspend_pcr) { | |
1123 | cmd.header.in = pcrextend_header; | |
1124 | cmd.params.pcrextend_in.pcr_idx = cpu_to_be32(tpm_suspend_pcr); | |
1125 | memcpy(cmd.params.pcrextend_in.hash, dummy_hash, | |
1126 | TPM_DIGEST_SIZE); | |
1127 | rc = transmit_cmd(chip, &cmd, EXTEND_PCR_RESULT_SIZE, | |
1128 | "extending dummy pcr before suspend"); | |
1129 | } | |
1130 | ||
1131 | /* now do the actual savestate */ | |
1132 | cmd.header.in = savestate_header; | |
1133 | rc = transmit_cmd(chip, &cmd, SAVESTATE_RESULT_SIZE, | |
1134 | "sending savestate before suspend"); | |
1135 | return rc; | |
1da177e4 | 1136 | } |
1da177e4 LT |
1137 | EXPORT_SYMBOL_GPL(tpm_pm_suspend); |
1138 | ||
1139 | /* | |
1140 | * Resume from a power safe. The BIOS already restored | |
1141 | * the TPM state. | |
1142 | */ | |
ce2c87d4 | 1143 | int tpm_pm_resume(struct device *dev) |
1da177e4 | 1144 | { |
ce2c87d4 | 1145 | struct tpm_chip *chip = dev_get_drvdata(dev); |
1da177e4 LT |
1146 | |
1147 | if (chip == NULL) | |
1148 | return -ENODEV; | |
1149 | ||
1da177e4 LT |
1150 | return 0; |
1151 | } | |
1da177e4 LT |
1152 | EXPORT_SYMBOL_GPL(tpm_pm_resume); |
1153 | ||
253115b7 RA |
1154 | /* In case vendor provided release function, call it too.*/ |
1155 | ||
1156 | void tpm_dev_vendor_release(struct tpm_chip *chip) | |
1157 | { | |
1158 | if (chip->vendor.release) | |
1159 | chip->vendor.release(chip->dev); | |
1160 | ||
1161 | clear_bit(chip->dev_num, dev_mask); | |
1162 | kfree(chip->vendor.miscdev.name); | |
1163 | } | |
1164 | EXPORT_SYMBOL_GPL(tpm_dev_vendor_release); | |
1165 | ||
1166 | ||
5bd91f18 RM |
1167 | /* |
1168 | * Once all references to platform device are down to 0, | |
1169 | * release all allocated structures. | |
5bd91f18 | 1170 | */ |
cbb2ed4a | 1171 | void tpm_dev_release(struct device *dev) |
5bd91f18 RM |
1172 | { |
1173 | struct tpm_chip *chip = dev_get_drvdata(dev); | |
1174 | ||
253115b7 | 1175 | tpm_dev_vendor_release(chip); |
5bd91f18 | 1176 | |
253115b7 | 1177 | chip->release(dev); |
5bd91f18 RM |
1178 | kfree(chip); |
1179 | } | |
253115b7 | 1180 | EXPORT_SYMBOL_GPL(tpm_dev_release); |
5bd91f18 | 1181 | |
1da177e4 LT |
1182 | /* |
1183 | * Called from tpm_<specific>.c probe function only for devices | |
1184 | * the driver has determined it should claim. Prior to calling | |
1185 | * this function the specific probe function has called pci_enable_device | |
1186 | * upon errant exit from this function specific probe function should call | |
1187 | * pci_disable_device | |
1188 | */ | |
f02a9364 RA |
1189 | struct tpm_chip *tpm_register_hardware(struct device *dev, |
1190 | const struct tpm_vendor_specific *entry) | |
1da177e4 | 1191 | { |
6f9beccb KJH |
1192 | #define DEVNAME_SIZE 7 |
1193 | ||
1194 | char *devname; | |
1da177e4 | 1195 | struct tpm_chip *chip; |
1da177e4 LT |
1196 | |
1197 | /* Driver specific per-device data */ | |
b888c87b | 1198 | chip = kzalloc(sizeof(*chip), GFP_KERNEL); |
8e39c933 PW |
1199 | devname = kmalloc(DEVNAME_SIZE, GFP_KERNEL); |
1200 | ||
dd78c943 AM |
1201 | if (chip == NULL || devname == NULL) |
1202 | goto out_free; | |
1da177e4 | 1203 | |
d081d470 MK |
1204 | mutex_init(&chip->buffer_mutex); |
1205 | mutex_init(&chip->tpm_mutex); | |
1da177e4 LT |
1206 | INIT_LIST_HEAD(&chip->list); |
1207 | ||
c4028958 | 1208 | INIT_WORK(&chip->work, timeout_work); |
09e12f9f | 1209 | |
40565f19 JS |
1210 | setup_timer(&chip->user_read_timer, user_reader_timeout, |
1211 | (unsigned long)chip); | |
fe3fd483 | 1212 | |
90dda520 | 1213 | memcpy(&chip->vendor, entry, sizeof(struct tpm_vendor_specific)); |
1da177e4 | 1214 | |
10685a95 | 1215 | chip->dev_num = find_first_zero_bit(dev_mask, TPM_NUM_DEVICES); |
1da177e4 | 1216 | |
10685a95 | 1217 | if (chip->dev_num >= TPM_NUM_DEVICES) { |
b888c87b | 1218 | dev_err(dev, "No available tpm device numbers\n"); |
dd78c943 | 1219 | goto out_free; |
1da177e4 | 1220 | } else if (chip->dev_num == 0) |
90dda520 | 1221 | chip->vendor.miscdev.minor = TPM_MINOR; |
1da177e4 | 1222 | else |
90dda520 | 1223 | chip->vendor.miscdev.minor = MISC_DYNAMIC_MINOR; |
1da177e4 | 1224 | |
10685a95 KJH |
1225 | set_bit(chip->dev_num, dev_mask); |
1226 | ||
6f9beccb | 1227 | scnprintf(devname, DEVNAME_SIZE, "%s%d", "tpm", chip->dev_num); |
90dda520 | 1228 | chip->vendor.miscdev.name = devname; |
1da177e4 | 1229 | |
94fbcded | 1230 | chip->vendor.miscdev.parent = dev; |
e659a3fe | 1231 | chip->dev = get_device(dev); |
5bd91f18 RM |
1232 | chip->release = dev->release; |
1233 | dev->release = tpm_dev_release; | |
1234 | dev_set_drvdata(dev, chip); | |
1da177e4 | 1235 | |
90dda520 | 1236 | if (misc_register(&chip->vendor.miscdev)) { |
e659a3fe | 1237 | dev_err(chip->dev, |
1da177e4 | 1238 | "unable to misc_register %s, minor %d\n", |
90dda520 KJH |
1239 | chip->vendor.miscdev.name, |
1240 | chip->vendor.miscdev.minor); | |
5bd91f18 | 1241 | put_device(chip->dev); |
e0dd03ca | 1242 | return NULL; |
1da177e4 LT |
1243 | } |
1244 | ||
f33d9bd5 | 1245 | if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { |
5d469ec0 | 1246 | misc_deregister(&chip->vendor.miscdev); |
5bd91f18 | 1247 | put_device(chip->dev); |
f02a9364 | 1248 | |
f33d9bd5 JG |
1249 | return NULL; |
1250 | } | |
1da177e4 | 1251 | |
55a82ab3 KJH |
1252 | chip->bios_dir = tpm_bios_log_setup(devname); |
1253 | ||
f02a9364 RA |
1254 | /* Make chip available */ |
1255 | spin_lock(&driver_lock); | |
1256 | list_add_rcu(&chip->list, &tpm_chip_list); | |
1257 | spin_unlock(&driver_lock); | |
1258 | ||
e0dd03ca | 1259 | return chip; |
dd78c943 AM |
1260 | |
1261 | out_free: | |
1262 | kfree(chip); | |
1263 | kfree(devname); | |
1264 | return NULL; | |
1da177e4 | 1265 | } |
1da177e4 LT |
1266 | EXPORT_SYMBOL_GPL(tpm_register_hardware); |
1267 | ||
1da177e4 LT |
1268 | MODULE_AUTHOR("Leendert van Doorn (leendert@watson.ibm.com)"); |
1269 | MODULE_DESCRIPTION("TPM Driver"); | |
1270 | MODULE_VERSION("2.0"); | |
1271 | MODULE_LICENSE("GPL"); |