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Message-Id: <20240913200517.3085794-18-ross.philipson@oracle.com>
Date: Fri, 13 Sep 2024 13:05:14 -0700
From: Ross Philipson <ross.philipson@...cle.com>
To: linux-kernel@...r.kernel.org, x86@...nel.org,
linux-integrity@...r.kernel.org, linux-doc@...r.kernel.org,
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Cc: ross.philipson@...cle.com, dpsmith@...rtussolutions.com,
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Subject: [PATCH v11 17/20] tpm: Add ability to set the default locality the TPM chip uses
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@...cle.com>
---
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
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