Merge tag 'tpmdd-next-20190625' of git://git.infradead.org/users/jjs/linux-tpmdd
[muen/linux.git] / drivers / char / tpm / tpm1-cmd.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2004 IBM Corporation
4  * Copyright (C) 2014 Intel Corporation
5  *
6  * Authors:
7  * Leendert van Doorn <leendert@watson.ibm.com>
8  * Dave Safford <safford@watson.ibm.com>
9  * Reiner Sailer <sailer@watson.ibm.com>
10  * Kylene Hall <kjhall@us.ibm.com>
11  *
12  * Device driver for TCG/TCPA TPM (trusted platform module).
13  * Specifications at www.trustedcomputinggroup.org
14  */
15
16 #include <linux/poll.h>
17 #include <linux/slab.h>
18 #include <linux/mutex.h>
19 #include <linux/spinlock.h>
20 #include <linux/freezer.h>
21 #include <linux/tpm_eventlog.h>
22
23 #include "tpm.h"
24
25 #define TPM_MAX_ORDINAL 243
26
27 /*
28  * Array with one entry per ordinal defining the maximum amount
29  * of time the chip could take to return the result.  The ordinal
30  * designation of short, medium or long is defined in a table in
31  * TCG Specification TPM Main Part 2 TPM Structures Section 17. The
32  * values of the SHORT, MEDIUM, and LONG durations are retrieved
33  * from the chip during initialization with a call to tpm_get_timeouts.
34  */
35 static const u8 tpm1_ordinal_duration[TPM_MAX_ORDINAL] = {
36         TPM_UNDEFINED,          /* 0 */
37         TPM_UNDEFINED,
38         TPM_UNDEFINED,
39         TPM_UNDEFINED,
40         TPM_UNDEFINED,
41         TPM_UNDEFINED,          /* 5 */
42         TPM_UNDEFINED,
43         TPM_UNDEFINED,
44         TPM_UNDEFINED,
45         TPM_UNDEFINED,
46         TPM_SHORT,              /* 10 */
47         TPM_SHORT,
48         TPM_MEDIUM,
49         TPM_LONG,
50         TPM_LONG,
51         TPM_MEDIUM,             /* 15 */
52         TPM_SHORT,
53         TPM_SHORT,
54         TPM_MEDIUM,
55         TPM_LONG,
56         TPM_SHORT,              /* 20 */
57         TPM_SHORT,
58         TPM_MEDIUM,
59         TPM_MEDIUM,
60         TPM_MEDIUM,
61         TPM_SHORT,              /* 25 */
62         TPM_SHORT,
63         TPM_MEDIUM,
64         TPM_SHORT,
65         TPM_SHORT,
66         TPM_MEDIUM,             /* 30 */
67         TPM_LONG,
68         TPM_MEDIUM,
69         TPM_SHORT,
70         TPM_SHORT,
71         TPM_SHORT,              /* 35 */
72         TPM_MEDIUM,
73         TPM_MEDIUM,
74         TPM_UNDEFINED,
75         TPM_UNDEFINED,
76         TPM_MEDIUM,             /* 40 */
77         TPM_LONG,
78         TPM_MEDIUM,
79         TPM_SHORT,
80         TPM_SHORT,
81         TPM_SHORT,              /* 45 */
82         TPM_SHORT,
83         TPM_SHORT,
84         TPM_SHORT,
85         TPM_LONG,
86         TPM_MEDIUM,             /* 50 */
87         TPM_MEDIUM,
88         TPM_UNDEFINED,
89         TPM_UNDEFINED,
90         TPM_UNDEFINED,
91         TPM_UNDEFINED,          /* 55 */
92         TPM_UNDEFINED,
93         TPM_UNDEFINED,
94         TPM_UNDEFINED,
95         TPM_UNDEFINED,
96         TPM_MEDIUM,             /* 60 */
97         TPM_MEDIUM,
98         TPM_MEDIUM,
99         TPM_SHORT,
100         TPM_SHORT,
101         TPM_MEDIUM,             /* 65 */
102         TPM_UNDEFINED,
103         TPM_UNDEFINED,
104         TPM_UNDEFINED,
105         TPM_UNDEFINED,
106         TPM_SHORT,              /* 70 */
107         TPM_SHORT,
108         TPM_UNDEFINED,
109         TPM_UNDEFINED,
110         TPM_UNDEFINED,
111         TPM_UNDEFINED,          /* 75 */
112         TPM_UNDEFINED,
113         TPM_UNDEFINED,
114         TPM_UNDEFINED,
115         TPM_UNDEFINED,
116         TPM_LONG,               /* 80 */
117         TPM_UNDEFINED,
118         TPM_MEDIUM,
119         TPM_LONG,
120         TPM_SHORT,
121         TPM_UNDEFINED,          /* 85 */
122         TPM_UNDEFINED,
123         TPM_UNDEFINED,
124         TPM_UNDEFINED,
125         TPM_UNDEFINED,
126         TPM_SHORT,              /* 90 */
127         TPM_SHORT,
128         TPM_SHORT,
129         TPM_SHORT,
130         TPM_SHORT,
131         TPM_UNDEFINED,          /* 95 */
132         TPM_UNDEFINED,
133         TPM_UNDEFINED,
134         TPM_UNDEFINED,
135         TPM_UNDEFINED,
136         TPM_MEDIUM,             /* 100 */
137         TPM_SHORT,
138         TPM_SHORT,
139         TPM_UNDEFINED,
140         TPM_UNDEFINED,
141         TPM_UNDEFINED,          /* 105 */
142         TPM_UNDEFINED,
143         TPM_UNDEFINED,
144         TPM_UNDEFINED,
145         TPM_UNDEFINED,
146         TPM_SHORT,              /* 110 */
147         TPM_SHORT,
148         TPM_SHORT,
149         TPM_SHORT,
150         TPM_SHORT,
151         TPM_SHORT,              /* 115 */
152         TPM_SHORT,
153         TPM_SHORT,
154         TPM_UNDEFINED,
155         TPM_UNDEFINED,
156         TPM_LONG,               /* 120 */
157         TPM_LONG,
158         TPM_MEDIUM,
159         TPM_UNDEFINED,
160         TPM_SHORT,
161         TPM_SHORT,              /* 125 */
162         TPM_SHORT,
163         TPM_LONG,
164         TPM_SHORT,
165         TPM_SHORT,
166         TPM_SHORT,              /* 130 */
167         TPM_MEDIUM,
168         TPM_UNDEFINED,
169         TPM_SHORT,
170         TPM_MEDIUM,
171         TPM_UNDEFINED,          /* 135 */
172         TPM_UNDEFINED,
173         TPM_UNDEFINED,
174         TPM_UNDEFINED,
175         TPM_UNDEFINED,
176         TPM_SHORT,              /* 140 */
177         TPM_SHORT,
178         TPM_UNDEFINED,
179         TPM_UNDEFINED,
180         TPM_UNDEFINED,
181         TPM_UNDEFINED,          /* 145 */
182         TPM_UNDEFINED,
183         TPM_UNDEFINED,
184         TPM_UNDEFINED,
185         TPM_UNDEFINED,
186         TPM_SHORT,              /* 150 */
187         TPM_MEDIUM,
188         TPM_MEDIUM,
189         TPM_SHORT,
190         TPM_SHORT,
191         TPM_UNDEFINED,          /* 155 */
192         TPM_UNDEFINED,
193         TPM_UNDEFINED,
194         TPM_UNDEFINED,
195         TPM_UNDEFINED,
196         TPM_SHORT,              /* 160 */
197         TPM_SHORT,
198         TPM_SHORT,
199         TPM_SHORT,
200         TPM_UNDEFINED,
201         TPM_UNDEFINED,          /* 165 */
202         TPM_UNDEFINED,
203         TPM_UNDEFINED,
204         TPM_UNDEFINED,
205         TPM_UNDEFINED,
206         TPM_LONG,               /* 170 */
207         TPM_UNDEFINED,
208         TPM_UNDEFINED,
209         TPM_UNDEFINED,
210         TPM_UNDEFINED,
211         TPM_UNDEFINED,          /* 175 */
212         TPM_UNDEFINED,
213         TPM_UNDEFINED,
214         TPM_UNDEFINED,
215         TPM_UNDEFINED,
216         TPM_MEDIUM,             /* 180 */
217         TPM_SHORT,
218         TPM_MEDIUM,
219         TPM_MEDIUM,
220         TPM_MEDIUM,
221         TPM_MEDIUM,             /* 185 */
222         TPM_SHORT,
223         TPM_UNDEFINED,
224         TPM_UNDEFINED,
225         TPM_UNDEFINED,
226         TPM_UNDEFINED,          /* 190 */
227         TPM_UNDEFINED,
228         TPM_UNDEFINED,
229         TPM_UNDEFINED,
230         TPM_UNDEFINED,
231         TPM_UNDEFINED,          /* 195 */
232         TPM_UNDEFINED,
233         TPM_UNDEFINED,
234         TPM_UNDEFINED,
235         TPM_UNDEFINED,
236         TPM_SHORT,              /* 200 */
237         TPM_UNDEFINED,
238         TPM_UNDEFINED,
239         TPM_UNDEFINED,
240         TPM_SHORT,
241         TPM_SHORT,              /* 205 */
242         TPM_SHORT,
243         TPM_SHORT,
244         TPM_SHORT,
245         TPM_SHORT,
246         TPM_MEDIUM,             /* 210 */
247         TPM_UNDEFINED,
248         TPM_MEDIUM,
249         TPM_MEDIUM,
250         TPM_MEDIUM,
251         TPM_UNDEFINED,          /* 215 */
252         TPM_MEDIUM,
253         TPM_UNDEFINED,
254         TPM_UNDEFINED,
255         TPM_SHORT,
256         TPM_SHORT,              /* 220 */
257         TPM_SHORT,
258         TPM_SHORT,
259         TPM_SHORT,
260         TPM_SHORT,
261         TPM_UNDEFINED,          /* 225 */
262         TPM_UNDEFINED,
263         TPM_UNDEFINED,
264         TPM_UNDEFINED,
265         TPM_UNDEFINED,
266         TPM_SHORT,              /* 230 */
267         TPM_LONG,
268         TPM_MEDIUM,
269         TPM_UNDEFINED,
270         TPM_UNDEFINED,
271         TPM_UNDEFINED,          /* 235 */
272         TPM_UNDEFINED,
273         TPM_UNDEFINED,
274         TPM_UNDEFINED,
275         TPM_UNDEFINED,
276         TPM_SHORT,              /* 240 */
277         TPM_UNDEFINED,
278         TPM_MEDIUM,
279 };
280
281 /**
282  * tpm1_calc_ordinal_duration() - calculate the maximum command duration
283  * @chip:    TPM chip to use.
284  * @ordinal: TPM command ordinal.
285  *
286  * The function returns the maximum amount of time the chip could take
287  * to return the result for a particular ordinal in jiffies.
288  *
289  * Return: A maximal duration time for an ordinal in jiffies.
290  */
291 unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal)
292 {
293         int duration_idx = TPM_UNDEFINED;
294         int duration = 0;
295
296         /*
297          * We only have a duration table for protected commands, where the upper
298          * 16 bits are 0. For the few other ordinals the fallback will be used.
299          */
300         if (ordinal < TPM_MAX_ORDINAL)
301                 duration_idx = tpm1_ordinal_duration[ordinal];
302
303         if (duration_idx != TPM_UNDEFINED)
304                 duration = chip->duration[duration_idx];
305         if (duration <= 0)
306                 return 2 * 60 * HZ;
307         else
308                 return duration;
309 }
310
311 #define TPM_ORD_STARTUP 153
312 #define TPM_ST_CLEAR 1
313
314 /**
315  * tpm_startup() - turn on the TPM
316  * @chip: TPM chip to use
317  *
318  * Normally the firmware should start the TPM. This function is provided as a
319  * workaround if this does not happen. A legal case for this could be for
320  * example when a TPM emulator is used.
321  *
322  * Return: same as tpm_transmit_cmd()
323  */
324 static int tpm1_startup(struct tpm_chip *chip)
325 {
326         struct tpm_buf buf;
327         int rc;
328
329         dev_info(&chip->dev, "starting up the TPM manually\n");
330
331         rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_STARTUP);
332         if (rc < 0)
333                 return rc;
334
335         tpm_buf_append_u16(&buf, TPM_ST_CLEAR);
336
337         rc = tpm_transmit_cmd(chip, &buf, 0, "attempting to start the TPM");
338         tpm_buf_destroy(&buf);
339         return rc;
340 }
341
342 int tpm1_get_timeouts(struct tpm_chip *chip)
343 {
344         cap_t cap;
345         unsigned long timeout_old[4], timeout_chip[4], timeout_eff[4];
346         ssize_t rc;
347
348         rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap, NULL,
349                          sizeof(cap.timeout));
350         if (rc == TPM_ERR_INVALID_POSTINIT) {
351                 if (tpm1_startup(chip))
352                         return rc;
353
354                 rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_TIMEOUT, &cap,
355                                  "attempting to determine the timeouts",
356                                  sizeof(cap.timeout));
357         }
358
359         if (rc) {
360                 dev_err(&chip->dev, "A TPM error (%zd) occurred attempting to determine the timeouts\n",
361                         rc);
362                 return rc;
363         }
364
365         timeout_old[0] = jiffies_to_usecs(chip->timeout_a);
366         timeout_old[1] = jiffies_to_usecs(chip->timeout_b);
367         timeout_old[2] = jiffies_to_usecs(chip->timeout_c);
368         timeout_old[3] = jiffies_to_usecs(chip->timeout_d);
369         timeout_chip[0] = be32_to_cpu(cap.timeout.a);
370         timeout_chip[1] = be32_to_cpu(cap.timeout.b);
371         timeout_chip[2] = be32_to_cpu(cap.timeout.c);
372         timeout_chip[3] = be32_to_cpu(cap.timeout.d);
373         memcpy(timeout_eff, timeout_chip, sizeof(timeout_eff));
374
375         /*
376          * Provide ability for vendor overrides of timeout values in case
377          * of misreporting.
378          */
379         if (chip->ops->update_timeouts)
380                 chip->ops->update_timeouts(chip, timeout_eff);
381
382         if (!chip->timeout_adjusted) {
383                 /* Restore default if chip reported 0 */
384                 unsigned int i;
385
386                 for (i = 0; i < ARRAY_SIZE(timeout_eff); i++) {
387                         if (timeout_eff[i])
388                                 continue;
389
390                         timeout_eff[i] = timeout_old[i];
391                         chip->timeout_adjusted = true;
392                 }
393
394                 if (timeout_eff[0] != 0 && timeout_eff[0] < 1000) {
395                         /* timeouts in msec rather usec */
396                         for (i = 0; i != ARRAY_SIZE(timeout_eff); i++)
397                                 timeout_eff[i] *= 1000;
398                         chip->timeout_adjusted = true;
399                 }
400         }
401
402         /* Report adjusted timeouts */
403         if (chip->timeout_adjusted) {
404                 dev_info(&chip->dev, HW_ERR "Adjusting reported timeouts: A %lu->%luus B %lu->%luus C %lu->%luus D %lu->%luus\n",
405                          timeout_chip[0], timeout_eff[0],
406                          timeout_chip[1], timeout_eff[1],
407                          timeout_chip[2], timeout_eff[2],
408                          timeout_chip[3], timeout_eff[3]);
409         }
410
411         chip->timeout_a = usecs_to_jiffies(timeout_eff[0]);
412         chip->timeout_b = usecs_to_jiffies(timeout_eff[1]);
413         chip->timeout_c = usecs_to_jiffies(timeout_eff[2]);
414         chip->timeout_d = usecs_to_jiffies(timeout_eff[3]);
415
416         rc = tpm1_getcap(chip, TPM_CAP_PROP_TIS_DURATION, &cap,
417                          "attempting to determine the durations",
418                           sizeof(cap.duration));
419         if (rc)
420                 return rc;
421
422         chip->duration[TPM_SHORT] =
423                 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_short));
424         chip->duration[TPM_MEDIUM] =
425                 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_medium));
426         chip->duration[TPM_LONG] =
427                 usecs_to_jiffies(be32_to_cpu(cap.duration.tpm_long));
428         chip->duration[TPM_LONG_LONG] = 0; /* not used under 1.2 */
429
430         /* The Broadcom BCM0102 chipset in a Dell Latitude D820 gets the above
431          * value wrong and apparently reports msecs rather than usecs. So we
432          * fix up the resulting too-small TPM_SHORT value to make things work.
433          * We also scale the TPM_MEDIUM and -_LONG values by 1000.
434          */
435         if (chip->duration[TPM_SHORT] < (HZ / 100)) {
436                 chip->duration[TPM_SHORT] = HZ;
437                 chip->duration[TPM_MEDIUM] *= 1000;
438                 chip->duration[TPM_LONG] *= 1000;
439                 chip->duration_adjusted = true;
440                 dev_info(&chip->dev, "Adjusting TPM timeout parameters.");
441         }
442
443         chip->flags |= TPM_CHIP_FLAG_HAVE_TIMEOUTS;
444         return 0;
445 }
446
447 #define TPM_ORD_PCR_EXTEND 20
448 int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash,
449                     const char *log_msg)
450 {
451         struct tpm_buf buf;
452         int rc;
453
454         rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCR_EXTEND);
455         if (rc)
456                 return rc;
457
458         tpm_buf_append_u32(&buf, pcr_idx);
459         tpm_buf_append(&buf, hash, TPM_DIGEST_SIZE);
460
461         rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE, log_msg);
462         tpm_buf_destroy(&buf);
463         return rc;
464 }
465
466 #define TPM_ORD_GET_CAP 101
467 ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
468                     const char *desc, size_t min_cap_length)
469 {
470         struct tpm_buf buf;
471         int rc;
472
473         rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_CAP);
474         if (rc)
475                 return rc;
476
477         if (subcap_id == TPM_CAP_VERSION_1_1 ||
478             subcap_id == TPM_CAP_VERSION_1_2) {
479                 tpm_buf_append_u32(&buf, subcap_id);
480                 tpm_buf_append_u32(&buf, 0);
481         } else {
482                 if (subcap_id == TPM_CAP_FLAG_PERM ||
483                     subcap_id == TPM_CAP_FLAG_VOL)
484                         tpm_buf_append_u32(&buf, TPM_CAP_FLAG);
485                 else
486                         tpm_buf_append_u32(&buf, TPM_CAP_PROP);
487
488                 tpm_buf_append_u32(&buf, 4);
489                 tpm_buf_append_u32(&buf, subcap_id);
490         }
491         rc = tpm_transmit_cmd(chip, &buf, min_cap_length, desc);
492         if (!rc)
493                 *cap = *(cap_t *)&buf.data[TPM_HEADER_SIZE + 4];
494         tpm_buf_destroy(&buf);
495         return rc;
496 }
497 EXPORT_SYMBOL_GPL(tpm1_getcap);
498
499 #define TPM_ORD_GET_RANDOM 70
500 struct tpm1_get_random_out {
501         __be32 rng_data_len;
502         u8 rng_data[TPM_MAX_RNG_DATA];
503 } __packed;
504
505 /**
506  * tpm1_get_random() - get random bytes from the TPM's RNG
507  * @chip:       a &struct tpm_chip instance
508  * @dest:       destination buffer for the random bytes
509  * @max:        the maximum number of bytes to write to @dest
510  *
511  * Return:
512  * *  number of bytes read
513  * * -errno (positive TPM return codes are masked to -EIO)
514  */
515 int tpm1_get_random(struct tpm_chip *chip, u8 *dest, size_t max)
516 {
517         struct tpm1_get_random_out *out;
518         u32 num_bytes =  min_t(u32, max, TPM_MAX_RNG_DATA);
519         struct tpm_buf buf;
520         u32 total = 0;
521         int retries = 5;
522         u32 recd;
523         int rc;
524
525         rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_RANDOM);
526         if (rc)
527                 return rc;
528
529         do {
530                 tpm_buf_append_u32(&buf, num_bytes);
531
532                 rc = tpm_transmit_cmd(chip, &buf, sizeof(out->rng_data_len),
533                                       "attempting get random");
534                 if (rc) {
535                         if (rc > 0)
536                                 rc = -EIO;
537                         goto out;
538                 }
539
540                 out = (struct tpm1_get_random_out *)&buf.data[TPM_HEADER_SIZE];
541
542                 recd = be32_to_cpu(out->rng_data_len);
543                 if (recd > num_bytes) {
544                         rc = -EFAULT;
545                         goto out;
546                 }
547
548                 if (tpm_buf_length(&buf) < TPM_HEADER_SIZE +
549                                            sizeof(out->rng_data_len) + recd) {
550                         rc = -EFAULT;
551                         goto out;
552                 }
553                 memcpy(dest, out->rng_data, recd);
554
555                 dest += recd;
556                 total += recd;
557                 num_bytes -= recd;
558
559                 tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_GET_RANDOM);
560         } while (retries-- && total < max);
561
562         rc = total ? (int)total : -EIO;
563 out:
564         tpm_buf_destroy(&buf);
565         return rc;
566 }
567
568 #define TPM_ORD_PCRREAD 21
569 int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf)
570 {
571         struct tpm_buf buf;
572         int rc;
573
574         rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_PCRREAD);
575         if (rc)
576                 return rc;
577
578         tpm_buf_append_u32(&buf, pcr_idx);
579
580         rc = tpm_transmit_cmd(chip, &buf, TPM_DIGEST_SIZE,
581                               "attempting to read a pcr value");
582         if (rc)
583                 goto out;
584
585         if (tpm_buf_length(&buf) < TPM_DIGEST_SIZE) {
586                 rc = -EFAULT;
587                 goto out;
588         }
589
590         memcpy(res_buf, &buf.data[TPM_HEADER_SIZE], TPM_DIGEST_SIZE);
591
592 out:
593         tpm_buf_destroy(&buf);
594         return rc;
595 }
596
597 #define TPM_ORD_CONTINUE_SELFTEST 83
598 /**
599  * tpm_continue_selftest() - run TPM's selftest
600  * @chip: TPM chip to use
601  *
602  * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
603  * a TPM error code.
604  */
605 static int tpm1_continue_selftest(struct tpm_chip *chip)
606 {
607         struct tpm_buf buf;
608         int rc;
609
610         rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_CONTINUE_SELFTEST);
611         if (rc)
612                 return rc;
613
614         rc = tpm_transmit_cmd(chip, &buf, 0, "continue selftest");
615         tpm_buf_destroy(&buf);
616         return rc;
617 }
618
619 /**
620  * tpm1_do_selftest - have the TPM continue its selftest and wait until it
621  *                   can receive further commands
622  * @chip: TPM chip to use
623  *
624  * Returns 0 on success, < 0 in case of fatal error or a value > 0 representing
625  * a TPM error code.
626  */
627 int tpm1_do_selftest(struct tpm_chip *chip)
628 {
629         int rc;
630         unsigned int loops;
631         unsigned int delay_msec = 100;
632         unsigned long duration;
633         u8 dummy[TPM_DIGEST_SIZE];
634
635         duration = tpm1_calc_ordinal_duration(chip, TPM_ORD_CONTINUE_SELFTEST);
636
637         loops = jiffies_to_msecs(duration) / delay_msec;
638
639         rc = tpm1_continue_selftest(chip);
640         if (rc == TPM_ERR_INVALID_POSTINIT) {
641                 chip->flags |= TPM_CHIP_FLAG_ALWAYS_POWERED;
642                 dev_info(&chip->dev, "TPM not ready (%d)\n", rc);
643         }
644         /* This may fail if there was no TPM driver during a suspend/resume
645          * cycle; some may return 10 (BAD_ORDINAL), others 28 (FAILEDSELFTEST)
646          */
647         if (rc)
648                 return rc;
649
650         do {
651                 /* Attempt to read a PCR value */
652                 rc = tpm1_pcr_read(chip, 0, dummy);
653
654                 /* Some buggy TPMs will not respond to tpm_tis_ready() for
655                  * around 300ms while the self test is ongoing, keep trying
656                  * until the self test duration expires.
657                  */
658                 if (rc == -ETIME) {
659                         dev_info(&chip->dev, HW_ERR "TPM command timed out during continue self test");
660                         tpm_msleep(delay_msec);
661                         continue;
662                 }
663
664                 if (rc == TPM_ERR_DISABLED || rc == TPM_ERR_DEACTIVATED) {
665                         dev_info(&chip->dev, "TPM is disabled/deactivated (0x%X)\n",
666                                  rc);
667                         /* TPM is disabled and/or deactivated; driver can
668                          * proceed and TPM does handle commands for
669                          * suspend/resume correctly
670                          */
671                         return 0;
672                 }
673                 if (rc != TPM_WARN_DOING_SELFTEST)
674                         return rc;
675                 tpm_msleep(delay_msec);
676         } while (--loops > 0);
677
678         return rc;
679 }
680 EXPORT_SYMBOL_GPL(tpm1_do_selftest);
681
682 /**
683  * tpm1_auto_startup - Perform the standard automatic TPM initialization
684  *                     sequence
685  * @chip: TPM chip to use
686  *
687  * Returns 0 on success, < 0 in case of fatal error.
688  */
689 int tpm1_auto_startup(struct tpm_chip *chip)
690 {
691         int rc;
692
693         rc = tpm1_get_timeouts(chip);
694         if (rc)
695                 goto out;
696         rc = tpm1_do_selftest(chip);
697         if (rc) {
698                 dev_err(&chip->dev, "TPM self test failed\n");
699                 goto out;
700         }
701
702         chip->allocated_banks = kcalloc(1, sizeof(*chip->allocated_banks),
703                                         GFP_KERNEL);
704         if (!chip->allocated_banks) {
705                 rc = -ENOMEM;
706                 goto out;
707         }
708
709         chip->allocated_banks[0].alg_id = TPM_ALG_SHA1;
710         chip->allocated_banks[0].digest_size = hash_digest_size[HASH_ALGO_SHA1];
711         chip->allocated_banks[0].crypto_id = HASH_ALGO_SHA1;
712         chip->nr_allocated_banks = 1;
713
714         return rc;
715 out:
716         if (rc > 0)
717                 rc = -ENODEV;
718         return rc;
719 }
720
721 #define TPM_ORD_SAVESTATE 152
722
723 /**
724  * tpm1_pm_suspend() - pm suspend handler
725  * @chip: TPM chip to use.
726  * @tpm_suspend_pcr: flush pcr for buggy TPM chips.
727  *
728  * The functions saves the TPM state to be restored on resume.
729  *
730  * Return:
731  * * 0 on success,
732  * * < 0 on error.
733  */
734 int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr)
735 {
736         u8 dummy_hash[TPM_DIGEST_SIZE] = { 0 };
737         struct tpm_buf buf;
738         unsigned int try;
739         int rc;
740
741
742         /* for buggy tpm, flush pcrs with extend to selected dummy */
743         if (tpm_suspend_pcr)
744                 rc = tpm1_pcr_extend(chip, tpm_suspend_pcr, dummy_hash,
745                                      "extending dummy pcr before suspend");
746
747         rc = tpm_buf_init(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE);
748         if (rc)
749                 return rc;
750         /* now do the actual savestate */
751         for (try = 0; try < TPM_RETRY; try++) {
752                 rc = tpm_transmit_cmd(chip, &buf, 0, NULL);
753                 /*
754                  * If the TPM indicates that it is too busy to respond to
755                  * this command then retry before giving up.  It can take
756                  * several seconds for this TPM to be ready.
757                  *
758                  * This can happen if the TPM has already been sent the
759                  * SaveState command before the driver has loaded.  TCG 1.2
760                  * specification states that any communication after SaveState
761                  * may cause the TPM to invalidate previously saved state.
762                  */
763                 if (rc != TPM_WARN_RETRY)
764                         break;
765                 tpm_msleep(TPM_TIMEOUT_RETRY);
766
767                 tpm_buf_reset(&buf, TPM_TAG_RQU_COMMAND, TPM_ORD_SAVESTATE);
768         }
769
770         if (rc)
771                 dev_err(&chip->dev, "Error (%d) sending savestate before suspend\n",
772                         rc);
773         else if (try > 0)
774                 dev_warn(&chip->dev, "TPM savestate took %dms\n",
775                          try * TPM_TIMEOUT_RETRY);
776
777         tpm_buf_destroy(&buf);
778
779         return rc;
780 }
781