| Message ID | 20240531010331.134441-18-ross.philipson@oracle.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | x86: Trenchboot secure dynamic launch Linux kernel support | expand |
On Fri May 31, 2024 at 4:03 AM EEST, Ross Philipson wrote: > 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 94231f052ea7..5f4a966a4599 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 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); > +} Disagree with the naming. BR, Jarkko
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c index 94231f052ea7..5f4a966a4599 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 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, @@ -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_preferred_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_preferred_locality.attr, NULL };
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(+)