2 * Copyright (C) 2004 IBM Corporation
3 * Copyright (C) 2015 Intel Corporation
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>
11 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
13 * Device driver for TCG/TCPA TPM (trusted platform module).
14 * Specifications at www.trustedcomputinggroup.org
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation, version 2 of the
26 #include <linux/module.h>
27 #include <linux/delay.h>
29 #include <linux/mutex.h>
30 #include <linux/sched.h>
31 #include <linux/platform_device.h>
33 #include <linux/tpm.h>
34 #include <linux/acpi.h>
35 #include <linux/cdev.h>
36 #include <linux/highmem.h>
37 #include <crypto/hash_info.h>
40 TPM_MINOR = 224, /* officially assigned */
42 TPM_NUM_DEVICES = 65536,
43 TPM_RETRY = 50, /* 5 seconds */
44 TPM_NUM_EVENT_LOG_FILES = 3,
48 TPM_TIMEOUT = 5, /* msecs */
49 TPM_TIMEOUT_RETRY = 100 /* msecs */
54 TPM_SUPERIO_ADDR = 0x2E,
58 /* Indexes the duration array */
66 #define TPM_WARN_RETRY 0x800
67 #define TPM_WARN_DOING_SELFTEST 0x802
68 #define TPM_ERR_DEACTIVATED 0x6
69 #define TPM_ERR_DISABLED 0x7
70 #define TPM_ERR_INVALID_POSTINIT 38
72 #define TPM_HEADER_SIZE 10
75 TPM2_PLATFORM_PCR = 24,
76 TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
78 TPM2_TIMEOUT_B = 2000,
81 TPM2_DURATION_SHORT = 20,
82 TPM2_DURATION_MEDIUM = 750,
83 TPM2_DURATION_LONG = 2000,
86 enum tpm2_structures {
87 TPM2_ST_NO_SESSIONS = 0x8001,
88 TPM2_ST_SESSIONS = 0x8002,
91 enum tpm2_return_codes {
92 TPM2_RC_HASH = 0x0083, /* RC_FMT1 */
93 TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */
94 TPM2_RC_DISABLED = 0x0120,
95 TPM2_RC_TESTING = 0x090A, /* RC_WARN */
98 enum tpm2_algorithms {
99 TPM2_ALG_ERROR = 0x0000,
100 TPM2_ALG_SHA1 = 0x0004,
101 TPM2_ALG_KEYEDHASH = 0x0008,
102 TPM2_ALG_SHA256 = 0x000B,
103 TPM2_ALG_SHA384 = 0x000C,
104 TPM2_ALG_SHA512 = 0x000D,
105 TPM2_ALG_NULL = 0x0010,
106 TPM2_ALG_SM3_256 = 0x0012,
109 enum tpm2_command_codes {
110 TPM2_CC_FIRST = 0x011F,
111 TPM2_CC_SELF_TEST = 0x0143,
112 TPM2_CC_STARTUP = 0x0144,
113 TPM2_CC_SHUTDOWN = 0x0145,
114 TPM2_CC_CREATE = 0x0153,
115 TPM2_CC_LOAD = 0x0157,
116 TPM2_CC_UNSEAL = 0x015E,
117 TPM2_CC_CONTEXT_SAVE = 0x0162,
118 TPM2_CC_FLUSH_CONTEXT = 0x0165,
119 TPM2_CC_GET_CAPABILITY = 0x017A,
120 TPM2_CC_GET_RANDOM = 0x017B,
121 TPM2_CC_PCR_READ = 0x017E,
122 TPM2_CC_PCR_EXTEND = 0x0182,
123 TPM2_CC_LAST = 0x018F,
126 enum tpm2_permanent_handles {
127 TPM2_RS_PW = 0x40000009,
130 enum tpm2_capabilities {
131 TPM2_CAP_COMMANDS = 2,
133 TPM2_CAP_TPM_PROPERTIES = 6,
136 enum tpm2_properties {
137 TPM_PT_TOTAL_COMMANDS = 0x0129,
140 enum tpm2_startup_types {
141 TPM2_SU_CLEAR = 0x0000,
142 TPM2_SU_STATE = 0x0001,
146 TPM2_CC_ATTR_CHANDLES = 25,
147 TPM2_CC_ATTR_RHANDLE = 28,
150 #define TPM_VID_INTEL 0x8086
151 #define TPM_VID_WINBOND 0x1050
152 #define TPM_VID_STM 0x104A
154 #define TPM_PPI_VERSION_LEN 3
156 enum tpm_chip_flags {
157 TPM_CHIP_FLAG_TPM2 = BIT(1),
158 TPM_CHIP_FLAG_IRQ = BIT(2),
159 TPM_CHIP_FLAG_VIRTUAL = BIT(3),
160 TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
163 struct tpm_bios_log {
164 void *bios_event_log;
165 void *bios_event_log_end;
168 struct tpm_chip_seqops {
169 struct tpm_chip *chip;
170 const struct seq_operations *seqops;
177 /* A driver callback under ops cannot be run unless ops_sem is held
178 * (sometimes implicitly, eg for the sysfs code). ops becomes null
179 * when the driver is unregistered, see tpm_try_get_ops.
181 struct rw_semaphore ops_sem;
182 const struct tpm_class_ops *ops;
184 struct tpm_bios_log log;
185 struct tpm_chip_seqops bin_log_seqops;
186 struct tpm_chip_seqops ascii_log_seqops;
190 int dev_num; /* /dev/tpm# */
191 unsigned long is_open; /* only one allowed */
193 struct mutex tpm_mutex; /* tpm is processing */
195 unsigned long timeout_a; /* jiffies */
196 unsigned long timeout_b; /* jiffies */
197 unsigned long timeout_c; /* jiffies */
198 unsigned long timeout_d; /* jiffies */
199 bool timeout_adjusted;
200 unsigned long duration[3]; /* jiffies */
201 bool duration_adjusted;
203 struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
205 const struct attribute_group *groups[3];
206 unsigned int groups_cnt;
210 acpi_handle acpi_dev_handle;
211 char ppi_version[TPM_PPI_VERSION_LEN + 1];
212 #endif /* CONFIG_ACPI */
218 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
220 struct tpm_input_header {
226 struct tpm_output_header {
232 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
234 struct stclear_flags_t {
237 u8 disableForceClear;
239 u8 physicalPresenceLock;
243 struct tpm_version_t {
250 struct tpm_version_1_2_t {
271 struct permanent_flags_t {
277 u8 disableOwnerClear;
279 u8 physicalPresenceLifetimeLock;
280 u8 physicalPresenceHWEnable;
281 u8 physicalPresenceCMDEnable;
292 u8 disableFullDALogicInfo;
296 struct permanent_flags_t perm_flags;
297 struct stclear_flags_t stclear_flags;
300 struct tpm_version_t tpm_version;
301 struct tpm_version_1_2_t tpm_version_1_2;
302 __be32 manufacturer_id;
303 struct timeout_t timeout;
304 struct duration_t duration;
307 enum tpm_capabilities {
310 TPM_CAP_VERSION_1_1 = 0x06,
311 TPM_CAP_VERSION_1_2 = 0x1A,
314 enum tpm_sub_capabilities {
315 TPM_CAP_PROP_PCR = 0x101,
316 TPM_CAP_PROP_MANUFACTURER = 0x103,
317 TPM_CAP_FLAG_PERM = 0x108,
318 TPM_CAP_FLAG_VOL = 0x109,
319 TPM_CAP_PROP_OWNER = 0x111,
320 TPM_CAP_PROP_TIS_TIMEOUT = 0x115,
321 TPM_CAP_PROP_TIS_DURATION = 0x120,
324 struct tpm_getcap_params_in {
330 struct tpm_getcap_params_out {
335 struct tpm_readpubek_params_out {
340 u8 parameters[12]; /*assuming RSA*/
347 struct tpm_input_header in;
348 struct tpm_output_header out;
351 struct tpm_pcrread_out {
352 u8 pcr_result[TPM_DIGEST_SIZE];
355 struct tpm_pcrread_in {
359 struct tpm_pcrextend_in {
361 u8 hash[TPM_DIGEST_SIZE];
364 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
365 * bytes, but 128 is still a relatively large number of random bytes and
366 * anything much bigger causes users of struct tpm_cmd_t to start getting
367 * compiler warnings about stack frame size. */
368 #define TPM_MAX_RNG_DATA 128
370 struct tpm_getrandom_out {
372 u8 rng_data[TPM_MAX_RNG_DATA];
375 struct tpm_getrandom_in {
379 struct tpm_startup_in {
384 struct tpm_getcap_params_out getcap_out;
385 struct tpm_readpubek_params_out readpubek_out;
386 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
387 struct tpm_getcap_params_in getcap_in;
388 struct tpm_pcrread_in pcrread_in;
389 struct tpm_pcrread_out pcrread_out;
390 struct tpm_pcrextend_in pcrextend_in;
391 struct tpm_getrandom_in getrandom_in;
392 struct tpm_getrandom_out getrandom_out;
393 struct tpm_startup_in startup_in;
397 tpm_cmd_header header;
398 tpm_cmd_params params;
403 u8 digest[SHA512_DIGEST_SIZE];
406 /* A string buffer type for constructing TPM commands. This is based on the
407 * ideas of string buffer code in security/keys/trusted.h but is heap based
408 * in order to keep the stack usage minimal.
412 TPM_BUF_OVERFLOW = BIT(0),
416 struct page *data_page;
421 static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
423 struct tpm_input_header *head;
425 buf->data_page = alloc_page(GFP_HIGHUSER);
430 buf->data = kmap(buf->data_page);
432 head = (struct tpm_input_header *) buf->data;
434 head->tag = cpu_to_be16(tag);
435 head->length = cpu_to_be32(sizeof(*head));
436 head->ordinal = cpu_to_be32(ordinal);
441 static inline void tpm_buf_destroy(struct tpm_buf *buf)
443 kunmap(buf->data_page);
444 __free_page(buf->data_page);
447 static inline u32 tpm_buf_length(struct tpm_buf *buf)
449 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
451 return be32_to_cpu(head->length);
454 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
456 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
458 return be16_to_cpu(head->tag);
461 static inline void tpm_buf_append(struct tpm_buf *buf,
462 const unsigned char *new_data,
463 unsigned int new_len)
465 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
466 u32 len = tpm_buf_length(buf);
468 /* Return silently if overflow has already happened. */
469 if (buf->flags & TPM_BUF_OVERFLOW)
472 if ((len + new_len) > PAGE_SIZE) {
473 WARN(1, "tpm_buf: overflow\n");
474 buf->flags |= TPM_BUF_OVERFLOW;
478 memcpy(&buf->data[len], new_data, new_len);
479 head->length = cpu_to_be32(len + new_len);
482 static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
484 tpm_buf_append(buf, &value, 1);
487 static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
489 __be16 value2 = cpu_to_be16(value);
491 tpm_buf_append(buf, (u8 *) &value2, 2);
494 static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
496 __be32 value2 = cpu_to_be32(value);
498 tpm_buf_append(buf, (u8 *) &value2, 4);
501 extern struct class *tpm_class;
502 extern dev_t tpm_devt;
503 extern const struct file_operations tpm_fops;
504 extern struct idr dev_nums_idr;
506 enum tpm_transmit_flags {
507 TPM_TRANSMIT_UNLOCKED = BIT(0),
510 ssize_t tpm_transmit(struct tpm_chip *chip, const u8 *buf, size_t bufsiz,
512 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, const void *buf, size_t bufsiz,
513 size_t min_rsp_body_len, unsigned int flags,
515 ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
516 const char *desc, size_t min_cap_length);
517 int tpm_get_timeouts(struct tpm_chip *);
518 int tpm1_auto_startup(struct tpm_chip *chip);
519 int tpm_do_selftest(struct tpm_chip *chip);
520 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
521 int tpm_pm_suspend(struct device *dev);
522 int tpm_pm_resume(struct device *dev);
523 int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
524 wait_queue_head_t *queue, bool check_cancel);
526 struct tpm_chip *tpm_chip_find_get(int chip_num);
527 __must_check int tpm_try_get_ops(struct tpm_chip *chip);
528 void tpm_put_ops(struct tpm_chip *chip);
530 struct tpm_chip *tpm_chip_alloc(struct device *dev,
531 const struct tpm_class_ops *ops);
532 struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
533 const struct tpm_class_ops *ops);
534 int tpm_chip_register(struct tpm_chip *chip);
535 void tpm_chip_unregister(struct tpm_chip *chip);
537 void tpm_sysfs_add_device(struct tpm_chip *chip);
539 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
542 extern void tpm_add_ppi(struct tpm_chip *chip);
544 static inline void tpm_add_ppi(struct tpm_chip *chip)
549 static inline inline u32 tpm2_rc_value(u32 rc)
551 return (rc & BIT(7)) ? rc & 0xff : rc;
554 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
555 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
556 struct tpm2_digest *digests);
557 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
558 void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
560 int tpm2_seal_trusted(struct tpm_chip *chip,
561 struct trusted_key_payload *payload,
562 struct trusted_key_options *options);
563 int tpm2_unseal_trusted(struct tpm_chip *chip,
564 struct trusted_key_payload *payload,
565 struct trusted_key_options *options);
566 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
567 u32 *value, const char *desc);
569 int tpm2_auto_startup(struct tpm_chip *chip);
570 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
571 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
572 int tpm2_probe(struct tpm_chip *chip);
573 int tpm2_find_cc(struct tpm_chip *chip, u32 cc);