drivers/char/tpm/tpm.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2004 IBM Corporation
   4  * Copyright (C) 2015 Intel Corporation
   5  *
   6  * Authors:
   7  * Leendert van Doorn <[email protected]>
   8  * Dave Safford <[email protected]>
   9  * Reiner Sailer <[email protected]>
  10  * Kylene Hall <[email protected]>
  11  *
  12  * Maintained by: <[email protected]>
  13  *
  14  * Device driver for TCG/TCPA TPM (trusted platform module).
  15  * Specifications at www.trustedcomputinggroup.org
  16  */
  17
  18 #ifndef __TPM_H__
  19 #define __TPM_H__
  20
  21 #include <linux/module.h>
  22 #include <linux/delay.h>
  23 #include <linux/mutex.h>
  24 #include <linux/sched.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/io.h>
  27 #include <linux/tpm.h>
  28 #include <linux/tpm_eventlog.h>
  29
  30 #ifdef CONFIG_X86
  31 #include <asm/intel-family.h>
  32 #endif
  33
  34 #define TPM_MINOR               224     /* officially assigned */
  35 #define TPM_BUFSIZE             4096
  36 #define TPM_NUM_DEVICES         65536
  37 #define TPM_RETRY               50
  38
  39 enum tpm_timeout {
  40         TPM_TIMEOUT = 5,        /* msecs */
  41         TPM_TIMEOUT_RETRY = 100, /* msecs */
  42         TPM_TIMEOUT_RANGE_US = 300,     /* usecs */
  43         TPM_TIMEOUT_POLL = 1,   /* msecs */
  44         TPM_TIMEOUT_USECS_MIN = 100,      /* usecs */
  45         TPM_TIMEOUT_USECS_MAX = 500      /* usecs */
  46 };
  47
  48 /* TPM addresses */
  49 enum tpm_addr {
  50         TPM_SUPERIO_ADDR = 0x2E,
  51         TPM_ADDR = 0x4E,
  52 };
  53
  54 #define TPM_WARN_RETRY          0x800
  55 #define TPM_WARN_DOING_SELFTEST 0x802
  56 #define TPM_ERR_DEACTIVATED     0x6
  57 #define TPM_ERR_DISABLED        0x7
  58 #define TPM_ERR_INVALID_POSTINIT 38
  59
  60 #define TPM_TAG_RQU_COMMAND 193
  61
  62 /* TPM2 specific constants. */
  63 #define TPM2_SPACE_BUFFER_SIZE          16384 /* 16 kB */
  64
  65 struct  stclear_flags_t {
  66         __be16  tag;
  67         u8      deactivated;
  68         u8      disableForceClear;
  69         u8      physicalPresence;
  70         u8      physicalPresenceLock;
  71         u8      bGlobalLock;
  72 } __packed;
  73
  74 struct tpm1_version {
  75         u8 major;
  76         u8 minor;
  77         u8 rev_major;
  78         u8 rev_minor;
  79 } __packed;
  80
  81 struct tpm1_version2 {
  82         __be16 tag;
  83         struct tpm1_version version;
  84 } __packed;
  85
  86 struct  timeout_t {
  87         __be32  a;
  88         __be32  b;
  89         __be32  c;
  90         __be32  d;
  91 } __packed;
  92
  93 struct duration_t {
  94         __be32  tpm_short;
  95         __be32  tpm_medium;
  96         __be32  tpm_long;
  97 } __packed;
  98
  99 struct permanent_flags_t {
 100         __be16  tag;
 101         u8      disable;
 102         u8      ownership;
 103         u8      deactivated;
 104         u8      readPubek;
 105         u8      disableOwnerClear;
 106         u8      allowMaintenance;
 107         u8      physicalPresenceLifetimeLock;
 108         u8      physicalPresenceHWEnable;
 109         u8      physicalPresenceCMDEnable;
 110         u8      CEKPUsed;
 111         u8      TPMpost;
 112         u8      TPMpostLock;
 113         u8      FIPS;
 114         u8      operator;
 115         u8      enableRevokeEK;
 116         u8      nvLocked;
 117         u8      readSRKPub;
 118         u8      tpmEstablished;
 119         u8      maintenanceDone;
 120         u8      disableFullDALogicInfo;
 121 } __packed;
 122
 123 typedef union {
 124         struct  permanent_flags_t perm_flags;
 125         struct  stclear_flags_t stclear_flags;
 126         __u8    owned;
 127         __be32  num_pcrs;
 128         struct tpm1_version version1;
 129         struct tpm1_version2 version2;
 130         __be32  manufacturer_id;
 131         struct timeout_t  timeout;
 132         struct duration_t duration;
 133 } cap_t;
 134
 135 enum tpm_capabilities {
 136         TPM_CAP_FLAG = 4,
 137         TPM_CAP_PROP = 5,
 138         TPM_CAP_VERSION_1_1 = 0x06,
 139         TPM_CAP_VERSION_1_2 = 0x1A,
 140 };
 141
 142 enum tpm_sub_capabilities {
 143         TPM_CAP_PROP_PCR = 0x101,
 144         TPM_CAP_PROP_MANUFACTURER = 0x103,
 145         TPM_CAP_FLAG_PERM = 0x108,
 146         TPM_CAP_FLAG_VOL = 0x109,
 147         TPM_CAP_PROP_OWNER = 0x111,
 148         TPM_CAP_PROP_TIS_TIMEOUT = 0x115,
 149         TPM_CAP_PROP_TIS_DURATION = 0x120,
 150 };
 151
 152
 153 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
 154  * bytes, but 128 is still a relatively large number of random bytes and
 155  * anything much bigger causes users of struct tpm_cmd_t to start getting
 156  * compiler warnings about stack frame size. */
 157 #define TPM_MAX_RNG_DATA        128
 158
 159 extern struct class *tpm_class;
 160 extern struct class *tpmrm_class;
 161 extern dev_t tpm_devt;
 162 extern const struct file_operations tpm_fops;
 163 extern const struct file_operations tpmrm_fops;
 164 extern struct idr dev_nums_idr;
 165
 166 ssize_t tpm_transmit(struct tpm_chip *chip, u8 *buf, size_t bufsiz);
 167 int tpm_get_timeouts(struct tpm_chip *);
 168 int tpm_auto_startup(struct tpm_chip *chip);
 169
 170 int tpm1_pm_suspend(struct tpm_chip *chip, u32 tpm_suspend_pcr);
 171 int tpm1_auto_startup(struct tpm_chip *chip);
 172 int tpm1_do_selftest(struct tpm_chip *chip);
 173 int tpm1_get_timeouts(struct tpm_chip *chip);
 174 unsigned long tpm1_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
 175 int tpm1_pcr_extend(struct tpm_chip *chip, u32 pcr_idx, const u8 *hash,
 176                     const char *log_msg);
 177 int tpm1_pcr_read(struct tpm_chip *chip, u32 pcr_idx, u8 *res_buf);
 178 ssize_t tpm1_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
 179                     const char *desc, size_t min_cap_length);
 180 int tpm1_get_random(struct tpm_chip *chip, u8 *out, size_t max);
 181 int tpm1_get_pcr_allocation(struct tpm_chip *chip);
 182 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
 183 int tpm_pm_suspend(struct device *dev);
 184 int tpm_pm_resume(struct device *dev);
 185
 186 static inline void tpm_msleep(unsigned int delay_msec)
 187 {
 188         usleep_range((delay_msec * 1000) - TPM_TIMEOUT_RANGE_US,
 189                      delay_msec * 1000);
 190 };
 191
 192 int tpm_chip_start(struct tpm_chip *chip);
 193 void tpm_chip_stop(struct tpm_chip *chip);
 194 struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip);
 195
 196 struct tpm_chip *tpm_chip_alloc(struct device *dev,
 197                                 const struct tpm_class_ops *ops);
 198 struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
 199                                  const struct tpm_class_ops *ops);
 200 int tpm_chip_register(struct tpm_chip *chip);
 201 void tpm_chip_unregister(struct tpm_chip *chip);
 202
 203 void tpm_sysfs_add_device(struct tpm_chip *chip);
 204
 205
 206 #ifdef CONFIG_ACPI
 207 extern void tpm_add_ppi(struct tpm_chip *chip);
 208 #else
 209 static inline void tpm_add_ppi(struct tpm_chip *chip)
 210 {
 211 }
 212 #endif
 213
 214 int tpm2_get_timeouts(struct tpm_chip *chip);
 215 int tpm2_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
 216                   struct tpm_digest *digest, u16 *digest_size_ptr);
 217 int tpm2_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
 218                     struct tpm_digest *digests);
 219 int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max);
 220 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 221                         u32 *value, const char *desc);
 222
 223 ssize_t tpm2_get_pcr_allocation(struct tpm_chip *chip);
 224 int tpm2_auto_startup(struct tpm_chip *chip);
 225 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 226 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
 227 int tpm2_probe(struct tpm_chip *chip);
 228 int tpm2_get_cc_attrs_tbl(struct tpm_chip *chip);
 229 int tpm2_find_cc(struct tpm_chip *chip, u32 cc);
 230 int tpm2_init_space(struct tpm_space *space, unsigned int buf_size);
 231 void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space);
 232 void tpm2_flush_space(struct tpm_chip *chip);
 233 int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u8 *cmd,
 234                        size_t cmdsiz);
 235 int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space, void *buf,
 236                       size_t *bufsiz);
 237
 238 void tpm_bios_log_setup(struct tpm_chip *chip);
 239 void tpm_bios_log_teardown(struct tpm_chip *chip);
 240 int tpm_dev_common_init(void);
 241 void tpm_dev_common_exit(void);
 242 #endif