226 lines
5.5 KiB
C
226 lines
5.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2004,2007,2008 IBM Corporation
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*
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* Authors:
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* Leendert van Doorn <leendert@watson.ibm.com>
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* Dave Safford <safford@watson.ibm.com>
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* Reiner Sailer <sailer@watson.ibm.com>
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* Kylene Hall <kjhall@us.ibm.com>
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* Debora Velarde <dvelarde@us.ibm.com>
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*
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* Maintained by: <tpmdd_devel@lists.sourceforge.net>
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*
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* Device driver for TCG/TCPA TPM (trusted platform module).
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* Specifications at www.trustedcomputinggroup.org
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*/
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#ifndef __LINUX_TPM_H__
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#define __LINUX_TPM_H__
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#include <linux/hw_random.h>
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#include <linux/acpi.h>
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#include <linux/cdev.h>
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#include <linux/fs.h>
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#include <crypto/hash_info.h>
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#define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
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#define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
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struct tpm_chip;
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struct trusted_key_payload;
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struct trusted_key_options;
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enum tpm_algorithms {
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TPM_ALG_ERROR = 0x0000,
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TPM_ALG_SHA1 = 0x0004,
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TPM_ALG_KEYEDHASH = 0x0008,
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TPM_ALG_SHA256 = 0x000B,
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TPM_ALG_SHA384 = 0x000C,
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TPM_ALG_SHA512 = 0x000D,
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TPM_ALG_NULL = 0x0010,
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TPM_ALG_SM3_256 = 0x0012,
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};
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struct tpm_digest {
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u16 alg_id;
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u8 digest[TPM_MAX_DIGEST_SIZE];
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} __packed;
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struct tpm_bank_info {
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u16 alg_id;
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u16 digest_size;
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u16 crypto_id;
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};
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enum TPM_OPS_FLAGS {
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TPM_OPS_AUTO_STARTUP = BIT(0),
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};
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struct tpm_class_ops {
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unsigned int flags;
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const u8 req_complete_mask;
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const u8 req_complete_val;
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bool (*req_canceled)(struct tpm_chip *chip, u8 status);
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int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
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int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
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void (*cancel) (struct tpm_chip *chip);
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u8 (*status) (struct tpm_chip *chip);
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void (*update_timeouts)(struct tpm_chip *chip,
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unsigned long *timeout_cap);
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int (*go_idle)(struct tpm_chip *chip);
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int (*cmd_ready)(struct tpm_chip *chip);
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int (*request_locality)(struct tpm_chip *chip, int loc);
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int (*relinquish_locality)(struct tpm_chip *chip, int loc);
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void (*clk_enable)(struct tpm_chip *chip, bool value);
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};
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#define TPM_NUM_EVENT_LOG_FILES 3
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/* Indexes the duration array */
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enum tpm_duration {
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TPM_SHORT = 0,
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TPM_MEDIUM = 1,
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TPM_LONG = 2,
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TPM_LONG_LONG = 3,
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TPM_UNDEFINED,
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TPM_NUM_DURATIONS = TPM_UNDEFINED,
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};
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#define TPM_PPI_VERSION_LEN 3
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struct tpm_space {
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u32 context_tbl[3];
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u8 *context_buf;
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u32 session_tbl[3];
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u8 *session_buf;
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u32 buf_size;
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};
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struct tpm_bios_log {
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void *bios_event_log;
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void *bios_event_log_end;
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};
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struct tpm_chip_seqops {
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struct tpm_chip *chip;
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const struct seq_operations *seqops;
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};
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struct tpm_chip {
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struct device dev;
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struct device devs;
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struct cdev cdev;
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struct cdev cdevs;
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/* A driver callback under ops cannot be run unless ops_sem is held
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* (sometimes implicitly, eg for the sysfs code). ops becomes null
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* when the driver is unregistered, see tpm_try_get_ops.
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*/
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struct rw_semaphore ops_sem;
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const struct tpm_class_ops *ops;
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struct tpm_bios_log log;
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struct tpm_chip_seqops bin_log_seqops;
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struct tpm_chip_seqops ascii_log_seqops;
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unsigned int flags;
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int dev_num; /* /dev/tpm# */
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unsigned long is_open; /* only one allowed */
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char hwrng_name[64];
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struct hwrng hwrng;
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struct mutex tpm_mutex; /* tpm is processing */
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unsigned long timeout_a; /* jiffies */
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unsigned long timeout_b; /* jiffies */
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unsigned long timeout_c; /* jiffies */
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unsigned long timeout_d; /* jiffies */
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bool timeout_adjusted;
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unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
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bool duration_adjusted;
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struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
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const struct attribute_group *groups[3];
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unsigned int groups_cnt;
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u32 nr_allocated_banks;
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struct tpm_bank_info *allocated_banks;
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#ifdef CONFIG_ACPI
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acpi_handle acpi_dev_handle;
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char ppi_version[TPM_PPI_VERSION_LEN + 1];
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#endif /* CONFIG_ACPI */
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struct tpm_space work_space;
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u32 last_cc;
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u32 nr_commands;
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u32 *cc_attrs_tbl;
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/* active locality */
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int locality;
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};
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#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
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extern int tpm_is_tpm2(struct tpm_chip *chip);
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extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
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struct tpm_digest *digest);
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extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
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struct tpm_digest *digests);
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extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
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extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
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extern int tpm_seal_trusted(struct tpm_chip *chip,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options);
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extern int tpm_unseal_trusted(struct tpm_chip *chip,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options);
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extern struct tpm_chip *tpm_default_chip(void);
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#else
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static inline int tpm_is_tpm2(struct tpm_chip *chip)
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{
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return -ENODEV;
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}
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static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx,
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struct tpm_digest *digest)
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{
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return -ENODEV;
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}
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static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
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struct tpm_digest *digests)
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{
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return -ENODEV;
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}
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static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
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{
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return -ENODEV;
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}
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static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
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{
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return -ENODEV;
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}
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static inline int tpm_seal_trusted(struct tpm_chip *chip,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options)
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{
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return -ENODEV;
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}
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static inline int tpm_unseal_trusted(struct tpm_chip *chip,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options)
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{
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return -ENODEV;
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}
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static inline struct tpm_chip *tpm_default_chip(void)
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{
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return NULL;
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}
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#endif
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#endif
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