1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2004,2007,2008 IBM Corporation
4 *
5 * Authors:
6 * Leendert van Doorn <leendert@watson.ibm.com>
7 * Dave Safford <safford@watson.ibm.com>
8 * Reiner Sailer <sailer@watson.ibm.com>
9 * Kylene Hall <kjhall@us.ibm.com>
10 * Debora Velarde <dvelarde@us.ibm.com>
11 *
12 * Maintained by: <tpmdd_devel@lists.sourceforge.net>
13 *
14 * Device driver for TCG/TCPA TPM (trusted platform module).
15 * Specifications at www.trustedcomputinggroup.org
16 */
17 #ifndef __LINUX_TPM_H__
18 #define __LINUX_TPM_H__
19
20 #include <linux/hw_random.h>
21 #include <linux/acpi.h>
22 #include <linux/cdev.h>
23 #include <linux/fs.h>
24 #include <linux/highmem.h>
25 #include <crypto/hash_info.h>
26 #include <crypto/aes.h>
27
28 #define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
29 #define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
30
31 struct tpm_chip;
32 struct trusted_key_payload;
33 struct trusted_key_options;
34 /* opaque structure, holds auth session parameters like the session key */
35 struct tpm2_auth;
36
37 enum tpm2_session_types {
38 TPM2_SE_HMAC = 0x00,
39 TPM2_SE_POLICY = 0x01,
40 TPM2_SE_TRIAL = 0x02,
41 };
42
43 /* if you add a new hash to this, increment TPM_MAX_HASHES below */
44 enum tpm_algorithms {
45 TPM_ALG_ERROR = 0x0000,
46 TPM_ALG_SHA1 = 0x0004,
47 TPM_ALG_AES = 0x0006,
48 TPM_ALG_KEYEDHASH = 0x0008,
49 TPM_ALG_SHA256 = 0x000B,
50 TPM_ALG_SHA384 = 0x000C,
51 TPM_ALG_SHA512 = 0x000D,
52 TPM_ALG_NULL = 0x0010,
53 TPM_ALG_SM3_256 = 0x0012,
54 TPM_ALG_ECC = 0x0023,
55 TPM_ALG_CFB = 0x0043,
56 };
57
58 /*
59 * maximum number of hashing algorithms a TPM can have. This is
60 * basically a count of every hash in tpm_algorithms above
61 */
62 #define TPM_MAX_HASHES 5
63
64 enum tpm2_curves {
65 TPM2_ECC_NONE = 0x0000,
66 TPM2_ECC_NIST_P256 = 0x0003,
67 };
68
69 struct tpm_digest {
70 u16 alg_id;
71 u8 digest[TPM_MAX_DIGEST_SIZE];
72 } __packed;
73
74 struct tpm_bank_info {
75 u16 alg_id;
76 u16 digest_size;
77 u16 crypto_id;
78 };
79
80 enum TPM_OPS_FLAGS {
81 TPM_OPS_AUTO_STARTUP = BIT(0),
82 };
83
84 struct tpm_class_ops {
85 unsigned int flags;
86 const u8 req_complete_mask;
87 const u8 req_complete_val;
88 bool (*req_canceled)(struct tpm_chip *chip, u8 status);
89 int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
90 int (*send)(struct tpm_chip *chip, u8 *buf, size_t bufsiz,
91 size_t cmd_len);
92 void (*cancel) (struct tpm_chip *chip);
93 u8 (*status) (struct tpm_chip *chip);
94 void (*update_timeouts)(struct tpm_chip *chip,
95 unsigned long *timeout_cap);
96 void (*update_durations)(struct tpm_chip *chip,
97 unsigned long *duration_cap);
98 int (*go_idle)(struct tpm_chip *chip);
99 int (*cmd_ready)(struct tpm_chip *chip);
100 int (*request_locality)(struct tpm_chip *chip, int loc);
101 int (*relinquish_locality)(struct tpm_chip *chip, int loc);
102 void (*clk_enable)(struct tpm_chip *chip, bool value);
103 };
104
105 #define TPM_NUM_EVENT_LOG_FILES 3
106
107 /* Indexes the duration array */
108 enum tpm_duration {
109 TPM_SHORT = 0,
110 TPM_MEDIUM = 1,
111 TPM_LONG = 2,
112 TPM_LONG_LONG = 3,
113 TPM_UNDEFINED,
114 TPM_NUM_DURATIONS = TPM_UNDEFINED,
115 };
116
117 #define TPM_PPI_VERSION_LEN 3
118
119 struct tpm_space {
120 u32 context_tbl[3];
121 u8 *context_buf;
122 u32 session_tbl[3];
123 u8 *session_buf;
124 u32 buf_size;
125 };
126
127 struct tpm_bios_log {
128 void *bios_event_log;
129 void *bios_event_log_end;
130 };
131
132 struct tpm_chip_seqops {
133 struct tpm_chip *chip;
134 const struct seq_operations *seqops;
135 };
136
137 /* fixed define for the curve we use which is NIST_P256 */
138 #define EC_PT_SZ 32
139
140 /*
141 * fixed define for the size of a name. This is actually HASHALG size
142 * plus 2, so 32 for SHA256
143 */
144 #define TPM2_NAME_SIZE 34
145
146 /*
147 * The maximum size for an object context
148 */
149 #define TPM2_MAX_CONTEXT_SIZE 4096
150
151 struct tpm_chip {
152 struct device dev;
153 struct device devs;
154 struct cdev cdev;
155 struct cdev cdevs;
156
157 /* A driver callback under ops cannot be run unless ops_sem is held
158 * (sometimes implicitly, eg for the sysfs code). ops becomes null
159 * when the driver is unregistered, see tpm_try_get_ops.
160 */
161 struct rw_semaphore ops_sem;
162 const struct tpm_class_ops *ops;
163
164 struct tpm_bios_log log;
165 struct tpm_chip_seqops bin_log_seqops;
166 struct tpm_chip_seqops ascii_log_seqops;
167
168 unsigned int flags;
169
170 int dev_num; /* /dev/tpm# */
171 unsigned long is_open; /* only one allowed */
172
173 char hwrng_name[64];
174 struct hwrng hwrng;
175
176 struct mutex tpm_mutex; /* tpm is processing */
177
178 unsigned long timeout_a; /* jiffies */
179 unsigned long timeout_b; /* jiffies */
180 unsigned long timeout_c; /* jiffies */
181 unsigned long timeout_d; /* jiffies */
182 bool timeout_adjusted;
183 unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
184 bool duration_adjusted;
185
186 struct dentry *bios_dir;
187
188 const struct attribute_group *groups[3 + TPM_MAX_HASHES];
189 unsigned int groups_cnt;
190
191 u32 nr_allocated_banks;
192 struct tpm_bank_info *allocated_banks;
193 #ifdef CONFIG_ACPI
194 acpi_handle acpi_dev_handle;
195 char ppi_version[TPM_PPI_VERSION_LEN + 1];
196 #endif /* CONFIG_ACPI */
197
198 struct tpm_space work_space;
199 u32 last_cc;
200 u32 nr_commands;
201 u32 *cc_attrs_tbl;
202
203 /* active locality */
204 int locality;
205
206 #ifdef CONFIG_TCG_TPM2_HMAC
207 /* details for communication security via sessions */
208
209 /* saved context for NULL seed */
210 u8 null_key_context[TPM2_MAX_CONTEXT_SIZE];
211 /* name of NULL seed */
212 u8 null_key_name[TPM2_NAME_SIZE];
213 u8 null_ec_key_x[EC_PT_SZ];
214 u8 null_ec_key_y[EC_PT_SZ];
215 struct tpm2_auth *auth;
216 #endif
217 };
218
219 #define TPM_HEADER_SIZE 10
220
221 enum tpm2_const {
222 TPM2_PLATFORM_PCR = 24,
223 TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
224 };
225
226 enum tpm2_timeouts {
227 TPM2_TIMEOUT_A = 750,
228 TPM2_TIMEOUT_B = 4000,
229 TPM2_TIMEOUT_C = 200,
230 TPM2_TIMEOUT_D = 30,
231 };
232
233 enum tpm2_durations {
234 TPM2_DURATION_SHORT = 20,
235 TPM2_DURATION_LONG = 2000,
236 TPM2_DURATION_DEFAULT = 120000,
237 };
238
239 enum tpm2_structures {
240 TPM2_ST_NO_SESSIONS = 0x8001,
241 TPM2_ST_SESSIONS = 0x8002,
242 TPM2_ST_CREATION = 0x8021,
243 };
244
245 /* Indicates from what layer of the software stack the error comes from */
246 #define TSS2_RC_LAYER_SHIFT 16
247 #define TSS2_RESMGR_TPM_RC_LAYER (11 << TSS2_RC_LAYER_SHIFT)
248
249 enum tpm2_return_codes {
250 TPM2_RC_SUCCESS = 0x0000,
251 TPM2_RC_HASH = 0x0083, /* RC_FMT1 */
252 TPM2_RC_HANDLE = 0x008B,
253 TPM2_RC_INTEGRITY = 0x009F,
254 TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */
255 TPM2_RC_FAILURE = 0x0101,
256 TPM2_RC_DISABLED = 0x0120,
257 TPM2_RC_UPGRADE = 0x012D,
258 TPM2_RC_COMMAND_CODE = 0x0143,
259 TPM2_RC_TESTING = 0x090A, /* RC_WARN */
260 TPM2_RC_REFERENCE_H0 = 0x0910,
261 TPM2_RC_RETRY = 0x0922,
262 TPM2_RC_SESSION_MEMORY = 0x0903,
263 };
264
265 enum tpm2_command_codes {
266 TPM2_CC_FIRST = 0x011F,
267 TPM2_CC_HIERARCHY_CONTROL = 0x0121,
268 TPM2_CC_HIERARCHY_CHANGE_AUTH = 0x0129,
269 TPM2_CC_CREATE_PRIMARY = 0x0131,
270 TPM2_CC_SEQUENCE_COMPLETE = 0x013E,
271 TPM2_CC_SELF_TEST = 0x0143,
272 TPM2_CC_STARTUP = 0x0144,
273 TPM2_CC_SHUTDOWN = 0x0145,
274 TPM2_CC_NV_READ = 0x014E,
275 TPM2_CC_CREATE = 0x0153,
276 TPM2_CC_LOAD = 0x0157,
277 TPM2_CC_SEQUENCE_UPDATE = 0x015C,
278 TPM2_CC_UNSEAL = 0x015E,
279 TPM2_CC_CONTEXT_LOAD = 0x0161,
280 TPM2_CC_CONTEXT_SAVE = 0x0162,
281 TPM2_CC_FLUSH_CONTEXT = 0x0165,
282 TPM2_CC_READ_PUBLIC = 0x0173,
283 TPM2_CC_START_AUTH_SESS = 0x0176,
284 TPM2_CC_VERIFY_SIGNATURE = 0x0177,
285 TPM2_CC_GET_CAPABILITY = 0x017A,
286 TPM2_CC_GET_RANDOM = 0x017B,
287 TPM2_CC_PCR_READ = 0x017E,
288 TPM2_CC_PCR_EXTEND = 0x0182,
289 TPM2_CC_EVENT_SEQUENCE_COMPLETE = 0x0185,
290 TPM2_CC_HASH_SEQUENCE_START = 0x0186,
291 TPM2_CC_CREATE_LOADED = 0x0191,
292 TPM2_CC_LAST = 0x0193, /* Spec 1.36 */
293 };
294
295 enum tpm2_permanent_handles {
296 TPM2_RH_NULL = 0x40000007,
297 TPM2_RS_PW = 0x40000009,
298 };
299
300 /* Most Significant Octet for key types */
301 enum tpm2_mso_type {
302 TPM2_MSO_NVRAM = 0x01,
303 TPM2_MSO_SESSION = 0x02,
304 TPM2_MSO_POLICY = 0x03,
305 TPM2_MSO_PERMANENT = 0x40,
306 TPM2_MSO_VOLATILE = 0x80,
307 TPM2_MSO_PERSISTENT = 0x81,
308 };
309
tpm2_handle_mso(u32 handle)310 static inline enum tpm2_mso_type tpm2_handle_mso(u32 handle)
311 {
312 return handle >> 24;
313 }
314
315 enum tpm2_capabilities {
316 TPM2_CAP_HANDLES = 1,
317 TPM2_CAP_COMMANDS = 2,
318 TPM2_CAP_PCRS = 5,
319 TPM2_CAP_TPM_PROPERTIES = 6,
320 };
321
322 enum tpm2_properties {
323 TPM_PT_TOTAL_COMMANDS = 0x0129,
324 };
325
326 enum tpm2_startup_types {
327 TPM2_SU_CLEAR = 0x0000,
328 TPM2_SU_STATE = 0x0001,
329 };
330
331 enum tpm2_cc_attrs {
332 TPM2_CC_ATTR_CHANDLES = 25,
333 TPM2_CC_ATTR_RHANDLE = 28,
334 TPM2_CC_ATTR_VENDOR = 29,
335 };
336
337 #define TPM_VID_INTEL 0x8086
338 #define TPM_VID_WINBOND 0x1050
339 #define TPM_VID_STM 0x104A
340 #define TPM_VID_ATML 0x1114
341 #define TPM_VID_IFX 0x15D1
342
343 enum tpm_chip_flags {
344 TPM_CHIP_FLAG_BOOTSTRAPPED = BIT(0),
345 TPM_CHIP_FLAG_TPM2 = BIT(1),
346 TPM_CHIP_FLAG_IRQ = BIT(2),
347 TPM_CHIP_FLAG_VIRTUAL = BIT(3),
348 TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
349 TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
350 TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED = BIT(6),
351 TPM_CHIP_FLAG_FIRMWARE_UPGRADE = BIT(7),
352 TPM_CHIP_FLAG_SUSPENDED = BIT(8),
353 TPM_CHIP_FLAG_HWRNG_DISABLED = BIT(9),
354 TPM_CHIP_FLAG_DISABLE = BIT(10),
355 TPM_CHIP_FLAG_SYNC = BIT(11),
356 };
357
358 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
359
360 struct tpm_header {
361 __be16 tag;
362 __be32 length;
363 union {
364 __be32 ordinal;
365 __be32 return_code;
366 };
367 } __packed;
368
369 enum tpm_buf_flags {
370 /* the capacity exceeded: */
371 TPM_BUF_OVERFLOW = BIT(0),
372 /* TPM2B format: */
373 TPM_BUF_TPM2B = BIT(1),
374 /* read out of boundary: */
375 TPM_BUF_BOUNDARY_ERROR = BIT(2),
376 };
377
378 /*
379 * A string buffer type for constructing TPM commands.
380 */
381 struct tpm_buf {
382 u32 flags;
383 u32 length;
384 u8 *data;
385 u8 handles;
386 };
387
388 enum tpm2_object_attributes {
389 TPM2_OA_FIXED_TPM = BIT(1),
390 TPM2_OA_ST_CLEAR = BIT(2),
391 TPM2_OA_FIXED_PARENT = BIT(4),
392 TPM2_OA_SENSITIVE_DATA_ORIGIN = BIT(5),
393 TPM2_OA_USER_WITH_AUTH = BIT(6),
394 TPM2_OA_ADMIN_WITH_POLICY = BIT(7),
395 TPM2_OA_NO_DA = BIT(10),
396 TPM2_OA_ENCRYPTED_DUPLICATION = BIT(11),
397 TPM2_OA_RESTRICTED = BIT(16),
398 TPM2_OA_DECRYPT = BIT(17),
399 TPM2_OA_SIGN = BIT(18),
400 };
401
402 enum tpm2_session_attributes {
403 TPM2_SA_CONTINUE_SESSION = BIT(0),
404 TPM2_SA_AUDIT_EXCLUSIVE = BIT(1),
405 TPM2_SA_AUDIT_RESET = BIT(3),
406 TPM2_SA_DECRYPT = BIT(5),
407 TPM2_SA_ENCRYPT = BIT(6),
408 TPM2_SA_AUDIT = BIT(7),
409 };
410
411 struct tpm2_hash {
412 unsigned int crypto_id;
413 unsigned int tpm_id;
414 };
415
416 int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal);
417 void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal);
418 int tpm_buf_init_sized(struct tpm_buf *buf);
419 void tpm_buf_reset_sized(struct tpm_buf *buf);
420 void tpm_buf_destroy(struct tpm_buf *buf);
421 u32 tpm_buf_length(struct tpm_buf *buf);
422 void tpm_buf_append(struct tpm_buf *buf, const u8 *new_data, u16 new_length);
423 void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value);
424 void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value);
425 void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value);
426 u8 tpm_buf_read_u8(struct tpm_buf *buf, off_t *offset);
427 u16 tpm_buf_read_u16(struct tpm_buf *buf, off_t *offset);
428 u32 tpm_buf_read_u32(struct tpm_buf *buf, off_t *offset);
429 void tpm_buf_append_handle(struct tpm_chip *chip, struct tpm_buf *buf, u32 handle);
430
431 /*
432 * Check if TPM device is in the firmware upgrade mode.
433 */
tpm_is_firmware_upgrade(struct tpm_chip * chip)434 static inline bool tpm_is_firmware_upgrade(struct tpm_chip *chip)
435 {
436 return chip->flags & TPM_CHIP_FLAG_FIRMWARE_UPGRADE;
437 }
438
tpm2_rc_value(u32 rc)439 static inline u32 tpm2_rc_value(u32 rc)
440 {
441 return (rc & BIT(7)) ? rc & 0xbf : rc;
442 }
443
444 /*
445 * Convert a return value from tpm_transmit_cmd() to POSIX error code.
446 */
tpm_ret_to_err(ssize_t ret)447 static inline ssize_t tpm_ret_to_err(ssize_t ret)
448 {
449 if (ret < 0)
450 return ret;
451
452 switch (tpm2_rc_value(ret)) {
453 case TPM2_RC_SUCCESS:
454 return 0;
455 case TPM2_RC_SESSION_MEMORY:
456 return -ENOMEM;
457 default:
458 return -EFAULT;
459 }
460 }
461
462 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
463
464 extern int tpm_is_tpm2(struct tpm_chip *chip);
465 extern __must_check int tpm_try_get_ops(struct tpm_chip *chip);
466 extern void tpm_put_ops(struct tpm_chip *chip);
467 extern ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
468 size_t min_rsp_body_length, const char *desc);
469 extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
470 struct tpm_digest *digest);
471 extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
472 struct tpm_digest *digests);
473 extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
474 extern struct tpm_chip *tpm_default_chip(void);
475 void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
476
tpm_buf_append_empty_auth(struct tpm_buf * buf,u32 handle)477 static inline void tpm_buf_append_empty_auth(struct tpm_buf *buf, u32 handle)
478 {
479 /* simple authorization for empty auth */
480 tpm_buf_append_u32(buf, 9); /* total length of auth */
481 tpm_buf_append_u32(buf, handle);
482 tpm_buf_append_u16(buf, 0); /* nonce len */
483 tpm_buf_append_u8(buf, 0); /* attributes */
484 tpm_buf_append_u16(buf, 0); /* hmac len */
485 }
486 #else
tpm_is_tpm2(struct tpm_chip * chip)487 static inline int tpm_is_tpm2(struct tpm_chip *chip)
488 {
489 return -ENODEV;
490 }
tpm_pcr_read(struct tpm_chip * chip,int pcr_idx,struct tpm_digest * digest)491 static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx,
492 struct tpm_digest *digest)
493 {
494 return -ENODEV;
495 }
496
tpm_pcr_extend(struct tpm_chip * chip,u32 pcr_idx,struct tpm_digest * digests)497 static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
498 struct tpm_digest *digests)
499 {
500 return -ENODEV;
501 }
502
tpm_get_random(struct tpm_chip * chip,u8 * data,size_t max)503 static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
504 {
505 return -ENODEV;
506 }
507
tpm_default_chip(void)508 static inline struct tpm_chip *tpm_default_chip(void)
509 {
510 return NULL;
511 }
512
tpm_buf_append_empty_auth(struct tpm_buf * buf,u32 handle)513 static inline void tpm_buf_append_empty_auth(struct tpm_buf *buf, u32 handle)
514 {
515 }
516 #endif
517
tpm2_chip_auth(struct tpm_chip * chip)518 static inline struct tpm2_auth *tpm2_chip_auth(struct tpm_chip *chip)
519 {
520 #ifdef CONFIG_TCG_TPM2_HMAC
521 return chip->auth;
522 #else
523 return NULL;
524 #endif
525 }
526
527 void tpm_buf_append_name(struct tpm_chip *chip, struct tpm_buf *buf,
528 u32 handle, u8 *name);
529 void tpm_buf_append_hmac_session(struct tpm_chip *chip, struct tpm_buf *buf,
530 u8 attributes, u8 *passphrase,
531 int passphraselen);
532 void tpm_buf_append_auth(struct tpm_chip *chip, struct tpm_buf *buf,
533 u8 attributes, u8 *passphrase, int passphraselen);
tpm_buf_append_hmac_session_opt(struct tpm_chip * chip,struct tpm_buf * buf,u8 attributes,u8 * passphrase,int passphraselen)534 static inline void tpm_buf_append_hmac_session_opt(struct tpm_chip *chip,
535 struct tpm_buf *buf,
536 u8 attributes,
537 u8 *passphrase,
538 int passphraselen)
539 {
540 struct tpm_header *head;
541 int offset;
542
543 if (tpm2_chip_auth(chip)) {
544 tpm_buf_append_hmac_session(chip, buf, attributes, passphrase, passphraselen);
545 } else {
546 offset = buf->handles * 4 + TPM_HEADER_SIZE;
547 head = (struct tpm_header *)buf->data;
548
549 /*
550 * If the only sessions are optional, the command tag must change to
551 * TPM2_ST_NO_SESSIONS.
552 */
553 if (tpm_buf_length(buf) == offset)
554 head->tag = cpu_to_be16(TPM2_ST_NO_SESSIONS);
555 }
556 }
557
558 #ifdef CONFIG_TCG_TPM2_HMAC
559
560 int tpm2_start_auth_session(struct tpm_chip *chip);
561 void tpm_buf_fill_hmac_session(struct tpm_chip *chip, struct tpm_buf *buf);
562 int tpm_buf_check_hmac_response(struct tpm_chip *chip, struct tpm_buf *buf,
563 int rc);
564 void tpm2_end_auth_session(struct tpm_chip *chip);
565 #else
566 #include <linux/unaligned.h>
567
tpm2_start_auth_session(struct tpm_chip * chip)568 static inline int tpm2_start_auth_session(struct tpm_chip *chip)
569 {
570 return 0;
571 }
tpm2_end_auth_session(struct tpm_chip * chip)572 static inline void tpm2_end_auth_session(struct tpm_chip *chip)
573 {
574 }
tpm_buf_fill_hmac_session(struct tpm_chip * chip,struct tpm_buf * buf)575 static inline void tpm_buf_fill_hmac_session(struct tpm_chip *chip,
576 struct tpm_buf *buf)
577 {
578 }
tpm_buf_check_hmac_response(struct tpm_chip * chip,struct tpm_buf * buf,int rc)579 static inline int tpm_buf_check_hmac_response(struct tpm_chip *chip,
580 struct tpm_buf *buf,
581 int rc)
582 {
583 return rc;
584 }
585 #endif /* CONFIG_TCG_TPM2_HMAC */
586
587 #endif
588