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charset="utf-8" DRTM needs to be able to set the locality used by kernel. Provide a one-shot function tpm_chip_set_locality() for the purpose. Signed-off-by: Ross Philipson Signed-off-by: Jarkko Sakkinen --- drivers/char/tpm/tpm-chip.c | 34 ++++++++++++++++++++++++++++++++- drivers/char/tpm/tpm_tis_core.c | 2 ++ include/linux/tpm.h | 4 ++++ 3 files changed, 39 insertions(+), 1 deletion(-) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 6cb25862688f..3171684ca782 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; =20 - rc =3D chip->ops->request_locality(chip, 0); + rc =3D chip->ops->request_locality(chip, chip->kernel_locality); if (rc < 0) return rc; =20 @@ -380,6 +380,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev, } =20 chip->locality =3D -1; + chip->kernel_locality =3D 0; return chip; =20 out: @@ -700,3 +701,34 @@ void tpm_chip_unregister(struct tpm_chip *chip) tpm_del_char_device(chip); } EXPORT_SYMBOL_GPL(tpm_chip_unregister); + +/** + * tpm_chip_set_locality() - Set the TPM locality kernel uses + * @chip: &tpm_chip instance + * @locality: new locality + * + * This a one-shot function. Returns zero or POSIX error on failure. + */ +int tpm_chip_set_locality(struct tpm_chip *chip, u8 locality) +{ + int ret; + + if (locality >=3D TPM_MAX_LOCALITY) + return -EINVAL; + + ret =3D tpm_try_get_ops(chip); + if (ret) + return ret; + + if (!(chip->flags & TPM_CHIP_FLAG_SET_LOCALITY_ENABLED)) { + tpm_put_ops(chip); + return -EPERM; + } + + chip->kernel_locality =3D locality; + chip->flags &=3D ~TPM_CHIP_FLAG_SET_LOCALITY_ENABLED; + tpm_put_ops(chip); + + return 0; +} +EXPORT_SYMBOL_GPL(tpm_chip_set_locality); diff --git a/drivers/char/tpm/tpm_tis_core.c b/drivers/char/tpm/tpm_tis_cor= e.c index 14a7e60bfbb8..07e3b6e137f7 100644 --- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -1125,6 +1125,8 @@ int tpm_tis_core_init(struct device *dev, struct tpm_= tis_data *priv, int irq, if (IS_ERR(chip)) return PTR_ERR(chip); =20 + chip->flags |=3D TPM_CHIP_FLAG_SET_LOCALITY_ENABLED; + #ifdef CONFIG_ACPI chip->acpi_dev_handle =3D acpi_dev_handle; #endif diff --git a/include/linux/tpm.h b/include/linux/tpm.h index 87978cc584ee..11264d04a9ef 100644 --- a/include/linux/tpm.h +++ b/include/linux/tpm.h @@ -167,6 +167,8 @@ struct tpm_chip { =20 /* active locality */ int locality; + /* the locality used by kernel */ + u8 kernel_locality; =20 #ifdef CONFIG_TCG_TPM2_HMAC /* details for communication security via sessions */ @@ -205,6 +207,7 @@ enum tpm_chip_flags { TPM_CHIP_FLAG_HWRNG_DISABLED =3D BIT(9), TPM_CHIP_FLAG_DISABLE =3D BIT(10), TPM_CHIP_FLAG_SYNC =3D BIT(11), + TPM_CHIP_FLAG_SET_LOCALITY_ENABLED =3D BIT(12), }; =20 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev) @@ -252,6 +255,7 @@ static inline ssize_t tpm_ret_to_err(ssize_t ret) 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); +int tpm_chip_set_locality(struct tpm_chip *chip, u8 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, --=20 2.43.7