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
22 #include <linux/module.h>
23 #include <linux/delay.h>
25 #include <linux/mutex.h>
26 #include <linux/sched.h>
27 #include <linux/platform_device.h>
29 #include <linux/tpm.h>
30 #include <linux/acpi.h>
31 #include <linux/cdev.h>
32 #include <linux/highmem.h>
35 TPM_MINOR = 224, /* officially assigned */
37 TPM_NUM_DEVICES = 65536,
38 TPM_RETRY = 50, /* 5 seconds */
42 TPM_TIMEOUT = 5, /* msecs */
43 TPM_TIMEOUT_RETRY = 100 /* msecs */
48 TPM_SUPERIO_ADDR = 0x2E,
52 /* Indexes the duration array */
60 #define TPM_WARN_RETRY 0x800
61 #define TPM_WARN_DOING_SELFTEST 0x802
62 #define TPM_ERR_DEACTIVATED 0x6
63 #define TPM_ERR_DISABLED 0x7
64 #define TPM_ERR_INVALID_POSTINIT 38
66 #define TPM_HEADER_SIZE 10
69 TPM2_PLATFORM_PCR = 24,
70 TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
72 TPM2_TIMEOUT_B = 2000,
75 TPM2_DURATION_SHORT = 20,
76 TPM2_DURATION_MEDIUM = 750,
77 TPM2_DURATION_LONG = 2000,
80 enum tpm2_structures {
81 TPM2_ST_NO_SESSIONS = 0x8001,
82 TPM2_ST_SESSIONS = 0x8002,
85 enum tpm2_return_codes {
86 TPM2_RC_HASH = 0x0083, /* RC_FMT1 */
87 TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */
88 TPM2_RC_DISABLED = 0x0120,
89 TPM2_RC_TESTING = 0x090A, /* RC_WARN */
92 enum tpm2_algorithms {
93 TPM2_ALG_SHA1 = 0x0004,
94 TPM2_ALG_KEYEDHASH = 0x0008,
95 TPM2_ALG_SHA256 = 0x000B,
96 TPM2_ALG_SHA384 = 0x000C,
97 TPM2_ALG_SHA512 = 0x000D,
98 TPM2_ALG_NULL = 0x0010,
99 TPM2_ALG_SM3_256 = 0x0012,
102 enum tpm2_command_codes {
103 TPM2_CC_FIRST = 0x011F,
104 TPM2_CC_SELF_TEST = 0x0143,
105 TPM2_CC_STARTUP = 0x0144,
106 TPM2_CC_SHUTDOWN = 0x0145,
107 TPM2_CC_CREATE = 0x0153,
108 TPM2_CC_LOAD = 0x0157,
109 TPM2_CC_UNSEAL = 0x015E,
110 TPM2_CC_FLUSH_CONTEXT = 0x0165,
111 TPM2_CC_GET_CAPABILITY = 0x017A,
112 TPM2_CC_GET_RANDOM = 0x017B,
113 TPM2_CC_PCR_READ = 0x017E,
114 TPM2_CC_PCR_EXTEND = 0x0182,
115 TPM2_CC_LAST = 0x018F,
118 enum tpm2_permanent_handles {
119 TPM2_RS_PW = 0x40000009,
122 enum tpm2_capabilities {
123 TPM2_CAP_TPM_PROPERTIES = 6,
126 enum tpm2_startup_types {
127 TPM2_SU_CLEAR = 0x0000,
128 TPM2_SU_STATE = 0x0001,
131 #define TPM_VID_INTEL 0x8086
132 #define TPM_VID_WINBOND 0x1050
133 #define TPM_VID_STM 0x104A
135 #define TPM_PPI_VERSION_LEN 3
137 enum tpm_chip_flags {
138 TPM_CHIP_FLAG_REGISTERED = BIT(0),
139 TPM_CHIP_FLAG_TPM2 = BIT(1),
140 TPM_CHIP_FLAG_IRQ = BIT(2),
147 /* A driver callback under ops cannot be run unless ops_sem is held
148 * (sometimes implicitly, eg for the sysfs code). ops becomes null
149 * when the driver is unregistered, see tpm_try_get_ops.
151 struct rw_semaphore ops_sem;
152 const struct tpm_class_ops *ops;
156 int dev_num; /* /dev/tpm# */
157 unsigned long is_open; /* only one allowed */
159 struct mutex tpm_mutex; /* tpm is processing */
161 unsigned long timeout_a; /* jiffies */
162 unsigned long timeout_b; /* jiffies */
163 unsigned long timeout_c; /* jiffies */
164 unsigned long timeout_d; /* jiffies */
165 bool timeout_adjusted;
166 unsigned long duration[3]; /* jiffies */
167 bool duration_adjusted;
169 struct dentry **bios_dir;
171 const struct attribute_group *groups[3];
172 unsigned int groups_cnt;
174 acpi_handle acpi_dev_handle;
175 char ppi_version[TPM_PPI_VERSION_LEN + 1];
176 #endif /* CONFIG_ACPI */
179 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
181 static inline int tpm_read_index(int base, int index)
184 return inb(base+1) & 0xFF;
187 static inline void tpm_write_index(int base, int index, int value)
190 outb(value & 0xFF, base+1);
192 struct tpm_input_header {
198 struct tpm_output_header {
204 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
206 struct stclear_flags_t {
209 u8 disableForceClear;
211 u8 physicalPresenceLock;
215 struct tpm_version_t {
222 struct tpm_version_1_2_t {
243 struct permanent_flags_t {
249 u8 disableOwnerClear;
251 u8 physicalPresenceLifetimeLock;
252 u8 physicalPresenceHWEnable;
253 u8 physicalPresenceCMDEnable;
264 u8 disableFullDALogicInfo;
268 struct permanent_flags_t perm_flags;
269 struct stclear_flags_t stclear_flags;
272 struct tpm_version_t tpm_version;
273 struct tpm_version_1_2_t tpm_version_1_2;
274 __be32 manufacturer_id;
275 struct timeout_t timeout;
276 struct duration_t duration;
279 enum tpm_capabilities {
280 TPM_CAP_FLAG = cpu_to_be32(4),
281 TPM_CAP_PROP = cpu_to_be32(5),
282 CAP_VERSION_1_1 = cpu_to_be32(0x06),
283 CAP_VERSION_1_2 = cpu_to_be32(0x1A)
286 enum tpm_sub_capabilities {
287 TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
288 TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
289 TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
290 TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
291 TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
292 TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
293 TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
297 struct tpm_getcap_params_in {
303 struct tpm_getcap_params_out {
308 struct tpm_readpubek_params_out {
313 u8 parameters[12]; /*assuming RSA*/
320 struct tpm_input_header in;
321 struct tpm_output_header out;
324 struct tpm_pcrread_out {
325 u8 pcr_result[TPM_DIGEST_SIZE];
328 struct tpm_pcrread_in {
332 struct tpm_pcrextend_in {
334 u8 hash[TPM_DIGEST_SIZE];
337 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
338 * bytes, but 128 is still a relatively large number of random bytes and
339 * anything much bigger causes users of struct tpm_cmd_t to start getting
340 * compiler warnings about stack frame size. */
341 #define TPM_MAX_RNG_DATA 128
343 struct tpm_getrandom_out {
345 u8 rng_data[TPM_MAX_RNG_DATA];
348 struct tpm_getrandom_in {
352 struct tpm_startup_in {
357 struct tpm_getcap_params_out getcap_out;
358 struct tpm_readpubek_params_out readpubek_out;
359 u8 readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
360 struct tpm_getcap_params_in getcap_in;
361 struct tpm_pcrread_in pcrread_in;
362 struct tpm_pcrread_out pcrread_out;
363 struct tpm_pcrextend_in pcrextend_in;
364 struct tpm_getrandom_in getrandom_in;
365 struct tpm_getrandom_out getrandom_out;
366 struct tpm_startup_in startup_in;
370 tpm_cmd_header header;
371 tpm_cmd_params params;
374 /* A string buffer type for constructing TPM commands. This is based on the
375 * ideas of string buffer code in security/keys/trusted.h but is heap based
376 * in order to keep the stack usage minimal.
380 TPM_BUF_OVERFLOW = BIT(0),
384 struct page *data_page;
389 static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
391 struct tpm_input_header *head;
393 buf->data_page = alloc_page(GFP_HIGHUSER);
398 buf->data = kmap(buf->data_page);
400 head = (struct tpm_input_header *) buf->data;
402 head->tag = cpu_to_be16(tag);
403 head->length = cpu_to_be32(sizeof(*head));
404 head->ordinal = cpu_to_be32(ordinal);
409 static inline void tpm_buf_destroy(struct tpm_buf *buf)
411 kunmap(buf->data_page);
412 __free_page(buf->data_page);
415 static inline u32 tpm_buf_length(struct tpm_buf *buf)
417 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
419 return be32_to_cpu(head->length);
422 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
424 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
426 return be16_to_cpu(head->tag);
429 static inline void tpm_buf_append(struct tpm_buf *buf,
430 const unsigned char *new_data,
431 unsigned int new_len)
433 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
434 u32 len = tpm_buf_length(buf);
436 /* Return silently if overflow has already happened. */
437 if (buf->flags & TPM_BUF_OVERFLOW)
440 if ((len + new_len) > PAGE_SIZE) {
441 WARN(1, "tpm_buf: overflow\n");
442 buf->flags |= TPM_BUF_OVERFLOW;
446 memcpy(&buf->data[len], new_data, new_len);
447 head->length = cpu_to_be32(len + new_len);
450 static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
452 tpm_buf_append(buf, &value, 1);
455 static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
457 __be16 value2 = cpu_to_be16(value);
459 tpm_buf_append(buf, (u8 *) &value2, 2);
462 static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
464 __be32 value2 = cpu_to_be32(value);
466 tpm_buf_append(buf, (u8 *) &value2, 4);
469 extern struct class *tpm_class;
470 extern dev_t tpm_devt;
471 extern const struct file_operations tpm_fops;
472 extern struct idr dev_nums_idr;
474 ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
476 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
478 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
480 extern int tpm_get_timeouts(struct tpm_chip *);
481 extern void tpm_gen_interrupt(struct tpm_chip *);
482 extern int tpm_do_selftest(struct tpm_chip *);
483 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
484 extern int tpm_pm_suspend(struct device *);
485 extern int tpm_pm_resume(struct device *);
486 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
487 wait_queue_head_t *, bool);
489 struct tpm_chip *tpm_chip_find_get(int chip_num);
490 __must_check int tpm_try_get_ops(struct tpm_chip *chip);
491 void tpm_put_ops(struct tpm_chip *chip);
493 extern struct tpm_chip *tpm_chip_alloc(struct device *dev,
494 const struct tpm_class_ops *ops);
495 extern struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
496 const struct tpm_class_ops *ops);
497 extern int tpm_chip_register(struct tpm_chip *chip);
498 extern void tpm_chip_unregister(struct tpm_chip *chip);
500 void tpm_sysfs_add_device(struct tpm_chip *chip);
502 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
505 extern void tpm_add_ppi(struct tpm_chip *chip);
507 static inline void tpm_add_ppi(struct tpm_chip *chip)
512 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
513 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
514 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
515 int tpm2_seal_trusted(struct tpm_chip *chip,
516 struct trusted_key_payload *payload,
517 struct trusted_key_options *options);
518 int tpm2_unseal_trusted(struct tpm_chip *chip,
519 struct trusted_key_payload *payload,
520 struct trusted_key_options *options);
521 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
522 u32 *value, const char *desc);
524 extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
525 extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
526 extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
527 extern int tpm2_do_selftest(struct tpm_chip *chip);
528 extern int tpm2_gen_interrupt(struct tpm_chip *chip);
529 extern int tpm2_probe(struct tpm_chip *chip);