Curently the locality is hard coded to 0 but for DRTM support, access is needed to localities 1 through 4. Signed-off-by: Ross Philipson <ross.philipson@xxxxxxxxxx> --- drivers/char/tpm/tpm-chip.c | 24 +++++++++++++++++++++++- include/linux/tpm.h | 4 ++++ 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 854546000c92..1ca390a742ed 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -44,7 +44,7 @@ static int tpm_request_locality(struct tpm_chip *chip) if (!chip->ops->request_locality) return 0; - rc = chip->ops->request_locality(chip, 0); + rc = chip->ops->request_locality(chip, chip->default_locality); if (rc < 0) return rc; @@ -143,6 +143,27 @@ void tpm_chip_stop(struct tpm_chip *chip) } EXPORT_SYMBOL_GPL(tpm_chip_stop); +/** + * tpm_chip_set_default_locality() - set the TPM chip default locality to open + * @chip: a TPM chip to use + * @locality: the default locality to set + * + * Return: + * * true - Preferred locality set + * * false - Invalid locality specified + */ +bool tpm_chip_set_default_locality(struct tpm_chip *chip, int locality) +{ + if (locality < 0 || locality >=TPM_MAX_LOCALITY) + return false; + + mutex_lock(&chip->tpm_mutex); + chip->default_locality = locality; + mutex_unlock(&chip->tpm_mutex); + return true; +} +EXPORT_SYMBOL_GPL(tpm_chip_set_default_locality); + /** * tpm_try_get_ops() - Get a ref to the tpm_chip * @chip: Chip to ref @@ -374,6 +395,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev, } chip->locality = -1; + chip->default_locality = 0; return chip; out: diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 98f2c7c1c52e..83e94b2f0cef 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -219,6 +219,9 @@ struct tpm_chip { u8 null_ec_key_y[EC_PT_SZ]; struct tpm2_auth *auth; #endif + + /* preferred locality - default 0 */ + int default_locality; }; #define TPM_HEADER_SIZE 10 @@ -446,6 +449,7 @@ static inline u32 tpm2_rc_value(u32 rc) extern int tpm_is_tpm2(struct tpm_chip *chip); extern __must_check int tpm_try_get_ops(struct tpm_chip *chip); extern void tpm_put_ops(struct tpm_chip *chip); +extern bool tpm_chip_set_default_locality(struct tpm_chip *chip, int locality); extern ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf, size_t min_rsp_body_length, const char *desc); extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx, -- 2.39.3