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 <[email protected]>
---
drivers/char/tpm/tpm-chip.c | 24 +++++++++++++++++++++++-
drivers/char/tpm/tpm-interface.c | 15 +++++++++++++++
drivers/char/tpm/tpm.h | 1 +
include/linux/tpm.h | 10 ++++++++++
4 files changed, 49 insertions(+), 1 deletion(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 42b1062e33cd..e4d591e8857b 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->pref_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_preferred_locality() - set the TPM chip preferred locality to open
+ * @chip: a TPM chip to use
+ * @locality: the preferred locality
+ *
+ * Return:
+ * * true - Preferred locality set
+ * * false - Invalid locality specified
+ */
+bool tpm_chip_preferred_locality(struct tpm_chip *chip, int locality)
+{
+ if (locality < 0 || locality >=TPM_MAX_LOCALITY)
+ return false;
+
+ mutex_lock(&chip->tpm_mutex);
+ chip->pref_locality = locality;
+ mutex_unlock(&chip->tpm_mutex);
+ return true;
+}
+EXPORT_SYMBOL_GPL(tpm_chip_preferred_locality);
+
/**
* tpm_try_get_ops() - Get a ref to the tpm_chip
* @chip: Chip to ref
@@ -368,6 +389,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *pdev,
}
chip->locality = -1;
+ chip->pref_locality = 0;
return chip;
out:
diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
index 66b16d26eecc..7a758c6d6d09 100644
--- a/drivers/char/tpm/tpm-interface.c
+++ b/drivers/char/tpm/tpm-interface.c
@@ -273,6 +273,21 @@ int tpm_is_tpm2(struct tpm_chip *chip)
}
EXPORT_SYMBOL_GPL(tpm_is_tpm2);
+/**
+ * tpm_preferred_locality() - set the TPM chip preferred locality to open
+ * @chip: a TPM chip to use
+ * @locality: the preferred locality
+ *
+ * Return:
+ * * true - Preferred locality set
+ * * false - Invalid locality specified
+ */
+bool tpm_preferred_locality(struct tpm_chip *chip, int locality)
+{
+ return tpm_chip_preferred_locality(chip, locality);
+}
+EXPORT_SYMBOL_GPL(tpm_preferred_locality);
+
/**
* tpm_pcr_read - read a PCR value from SHA1 bank
* @chip: a &struct tpm_chip instance, %NULL for the default chip
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 61445f1dc46d..389b117e68c2 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -267,6 +267,7 @@ static inline void tpm_msleep(unsigned int delay_msec)
int tpm_chip_bootstrap(struct tpm_chip *chip);
int tpm_chip_start(struct tpm_chip *chip);
void tpm_chip_stop(struct tpm_chip *chip);
+bool tpm_chip_preferred_locality(struct tpm_chip *chip, int locality);
struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip);
struct tpm_chip *tpm_chip_alloc(struct device *dev,
diff --git a/include/linux/tpm.h b/include/linux/tpm.h
index 4ee9d13749ad..a61d4e5e4b2d 100644
--- a/include/linux/tpm.h
+++ b/include/linux/tpm.h
@@ -116,6 +116,12 @@ struct tpm_chip_seqops {
const struct seq_operations *seqops;
};
+/*
+ * The maximum locality (0 - 4) for a TPM, as defined in section 3.2 of the
+ * Client Platform Profile Specification.
+ */
+#define TPM_MAX_LOCALITY 4
+
struct tpm_chip {
struct device dev;
struct device devs;
@@ -170,6 +176,9 @@ struct tpm_chip {
/* active locality */
int locality;
+
+ /* preferred locality - default 0 */
+ int pref_locality;
};
#define TPM_HEADER_SIZE 10
@@ -421,6 +430,7 @@ static inline u32 tpm2_rc_value(u32 rc)
#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
extern int tpm_is_tpm2(struct tpm_chip *chip);
+extern bool tpm_preferred_locality(struct tpm_chip *chip, int locality);
extern __must_check int tpm_try_get_ops(struct tpm_chip *chip);
extern void tpm_put_ops(struct tpm_chip *chip);
extern ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_buf *buf,
--
2.39.3