[PATCH v10 18/20] tpm: Add sysfs interface to allow setting and querying the default locality
From: Ross Philipson <hidden>
Date: 2024-08-26 22:44:14
Also in:
kexec, linux-crypto, linux-doc, linux-efi, lkml
Subsystem:
the rest, tpm device driver · Maintainers:
Linus Torvalds, Peter Huewe, Jarkko Sakkinen
Expose a sysfs interface to allow user mode to set and query the default locality set for the TPM chip. Signed-off-by: Ross Philipson <redacted> --- drivers/char/tpm/tpm-sysfs.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+)
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 94231f052ea7..185a2f57d4cb 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c@@ -324,6 +324,34 @@ static ssize_t null_name_show(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR_RO(null_name); #endif +static ssize_t default_locality_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct tpm_chip *chip = to_tpm_chip(dev); + + return sprintf(buf, "%d\n", chip->default_locality); +} + +static ssize_t default_locality_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct tpm_chip *chip = to_tpm_chip(dev); + unsigned int locality; + + if (kstrtouint(buf, 0, &locality)) + return -ERANGE; + + if (locality >= TPM_MAX_LOCALITY) + return -ERANGE; + + if (tpm_chip_set_default_locality(chip, (int)locality)) + return count; + else + return 0; +} + +static DEVICE_ATTR_RW(default_locality); + static struct attribute *tpm1_dev_attrs[] = { &dev_attr_pubek.attr, &dev_attr_pcrs.attr,
@@ -336,6 +364,7 @@ static struct attribute *tpm1_dev_attrs[] = { &dev_attr_durations.attr, &dev_attr_timeouts.attr, &dev_attr_tpm_version_major.attr, + &dev_attr_default_locality.attr, NULL, };
@@ -344,6 +373,7 @@ static struct attribute *tpm2_dev_attrs[] = { #ifdef CONFIG_TCG_TPM2_HMAC &dev_attr_null_name.attr, #endif + &dev_attr_default_locality.attr, NULL };
--
2.39.3