877c57d0d0
This commit adds support for requesting and relinquishing locality 0 in tpm_crb for the course of command transmission. In order to achieve this, two new callbacks are added to struct tpm_class_ops: - request_locality - relinquish_locality With CRB interface you first set either requestAccess or relinquish bit from TPM_LOC_CTRL_x register and then wait for locAssigned and tpmRegValidSts bits to be set in the TPM_LOC_STATE_x register. The reason why were are doing this is to make sure that the driver will work properly with Intel TXT that uses locality 2. There's no explicit guarantee that it would relinquish this locality. In more general sense this commit enables tpm_crb to be a well behaving citizen in a multi locality environment. Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com> Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com> Tested-by: Jerry Snitselaar <jsnitsel@redhat.com>
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2 of the
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* License.
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*
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*/
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#ifndef __LINUX_TPM_H__
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#define __LINUX_TPM_H__
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#define TPM_DIGEST_SIZE 20 /* Max TPM v1.2 PCR size */
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/*
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* Chip num is this value or a valid tpm idx
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*/
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#define TPM_ANY_NUM 0xFFFF
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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_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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bool (*update_timeouts)(struct tpm_chip *chip,
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unsigned long *timeout_cap);
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int (*request_locality)(struct tpm_chip *chip, int loc);
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void (*relinquish_locality)(struct tpm_chip *chip, int loc);
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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(u32 chip_num);
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extern int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf);
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extern int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash);
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extern int tpm_send(u32 chip_num, void *cmd, size_t buflen);
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extern int tpm_get_random(u32 chip_num, u8 *data, size_t max);
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extern int tpm_seal_trusted(u32 chip_num,
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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(u32 chip_num,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options);
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#else
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static inline int tpm_is_tpm2(u32 chip_num)
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{
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return -ENODEV;
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}
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static inline int tpm_pcr_read(u32 chip_num, int pcr_idx, u8 *res_buf) {
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return -ENODEV;
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}
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static inline int tpm_pcr_extend(u32 chip_num, int pcr_idx, const u8 *hash) {
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return -ENODEV;
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}
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static inline int tpm_send(u32 chip_num, void *cmd, size_t buflen) {
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return -ENODEV;
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}
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static inline int tpm_get_random(u32 chip_num, u8 *data, size_t max) {
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return -ENODEV;
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}
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static inline int tpm_seal_trusted(u32 chip_num,
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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(u32 chip_num,
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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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#endif
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#endif
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