[v8,13/15] tpm: Add sysfs interface to allow setting and querying the preferred locality
Message ID | 20240214221847.2066632-14-ross.philipson@oracle.com |
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State | New |
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x86: Trenchboot secure dynamic launch Linux kernel support
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Commit Message
Ross Philipson
Feb. 14, 2024, 10:18 p.m. UTC
Expose a sysfs interface to allow user mode to set and query the preferred
locality for the TPM chip.
Signed-off-by: Ross Philipson <ross.philipson@oracle.com>
---
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 54c71473aa29..c43630d0996e 100644 --- a/drivers/char/tpm/tpm-sysfs.c +++ b/drivers/char/tpm/tpm-sysfs.c @@ -309,6 +309,34 @@ static ssize_t tpm_version_major_show(struct device *dev, } static DEVICE_ATTR_RO(tpm_version_major); +static ssize_t preferred_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->pref_locality); +} + +static ssize_t preferred_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_preferred_locality(chip, (int)locality)) + return count; + else + return 0; +} + +static DEVICE_ATTR_RW(preferred_locality); + static struct attribute *tpm1_dev_attrs[] = { &dev_attr_pubek.attr, &dev_attr_pcrs.attr, @@ -321,11 +349,13 @@ static struct attribute *tpm1_dev_attrs[] = { &dev_attr_durations.attr, &dev_attr_timeouts.attr, &dev_attr_tpm_version_major.attr, + &dev_attr_preferred_locality.attr, NULL, }; static struct attribute *tpm2_dev_attrs[] = { &dev_attr_tpm_version_major.attr, + &dev_attr_preferred_locality.attr, NULL };