[PATCH v2] tpm: add sysfs attributes for tpm2
From: Andrey Pronin
Date: Tue Jul 19 2016 - 22:51:57 EST
Add sysfs attributes in TPM2.0 case for:
- TPM_PT_PERMANENT flags
- TPM_PT_STARTUP_CLEAR flags
- lockout-related properties
v2: Dropped adding driver-specific attributes.
No legacy links for TPM2 attributes.
All attributes created in groups[0].
Added actual attributes for flags and lockout properties.
Signed-off-by: Andrey Pronin <apronin@xxxxxxxxxxxx>
---
drivers/char/tpm/tpm-chip.c | 4 +-
drivers/char/tpm/tpm-sysfs.c | 108 +++++++++++++++++++++++++++++++++++++++++--
drivers/char/tpm/tpm.h | 30 ++++++++++++
3 files changed, 136 insertions(+), 6 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index e595013..ede2ca0 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -281,8 +281,6 @@ static int tpm1_chip_register(struct tpm_chip *chip)
if (chip->flags & TPM_CHIP_FLAG_TPM2)
return 0;
- tpm_sysfs_add_device(chip);
-
chip->bios_dir = tpm_bios_log_setup(dev_name(&chip->dev));
return 0;
@@ -363,6 +361,8 @@ int tpm_chip_register(struct tpm_chip *chip)
return rc;
}
+ tpm_sysfs_add_device(chip);
+
rc = tpm1_chip_register(chip);
if (rc)
return rc;
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index b46cf70..fcfc7e0 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -264,7 +264,7 @@ static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
}
static DEVICE_ATTR_RO(timeouts);
-static struct attribute *tpm_dev_attrs[] = {
+static struct attribute *tpm1_dev_attrs[] = {
&dev_attr_pubek.attr,
&dev_attr_pcrs.attr,
&dev_attr_enabled.attr,
@@ -278,8 +278,106 @@ static struct attribute *tpm_dev_attrs[] = {
NULL,
};
-static const struct attribute_group tpm_dev_group = {
- .attrs = tpm_dev_attrs,
+static const struct attribute_group tpm1_dev_group = {
+ .attrs = tpm1_dev_attrs,
+};
+
+static ssize_t tpm2_prop_flag_show(struct device *dev, u32 property_id,
+ u32 flag_mask, char *buf)
+{
+ u32 flags;
+ ssize_t rc;
+
+ rc = tpm2_get_tpm_pt(to_tpm_chip(dev), property_id, &flags,
+ "reading property");
+ if (rc)
+ return 0;
+
+ return sprintf(buf, "%d\n", !!(flags & flag_mask));
+}
+
+static ssize_t tpm2_prop_u32_show(struct device *dev, u32 property_id,
+ char *buf)
+{
+ u32 value;
+ ssize_t rc;
+
+ rc = tpm2_get_tpm_pt(to_tpm_chip(dev), property_id, &value,
+ "reading property");
+ if (rc)
+ return 0;
+
+ return sprintf(buf, "%u\n", value);
+}
+
+#define DEFINE_TPM2_PROP_FLAG_ATTR(name, property_id, flag_mask) \
+static ssize_t name##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ return tpm2_prop_flag_show(dev, property_id, flag_mask, buf); \
+} \
+static DEVICE_ATTR_RO(name)
+
+#define DEFINE_TPM2_PROP_U32_ATTR(name, property_id) \
+static ssize_t name##_show(struct device *dev, \
+ struct device_attribute *attr, char *buf) \
+{ \
+ return tpm2_prop_u32_show(dev, property_id, buf); \
+} \
+static DEVICE_ATTR_RO(name)
+
+DEFINE_TPM2_PROP_FLAG_ATTR(owner_auth_set,
+ TPM2_PT_PERMANENT, TPM2_ATTR_OWNER_AUTH_SET);
+DEFINE_TPM2_PROP_FLAG_ATTR(endorsement_auth_set,
+ TPM2_PT_PERMANENT, TPM2_ATTR_ENDORSEMENT_AUTH_SET);
+DEFINE_TPM2_PROP_FLAG_ATTR(lockout_auth_set,
+ TPM2_PT_PERMANENT, TPM2_ATTR_LOCKOUT_AUTH_SET);
+DEFINE_TPM2_PROP_FLAG_ATTR(disable_clear,
+ TPM2_PT_PERMANENT, TPM2_ATTR_DISABLE_CLEAR);
+DEFINE_TPM2_PROP_FLAG_ATTR(in_lockout,
+ TPM2_PT_PERMANENT, TPM2_ATTR_IN_LOCKOUT);
+DEFINE_TPM2_PROP_FLAG_ATTR(tpm_generated_eps,
+ TPM2_PT_PERMANENT, TPM2_ATTR_TPM_GENERATED_EPS);
+
+DEFINE_TPM2_PROP_FLAG_ATTR(ph_enable,
+ TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_PH_ENABLE);
+DEFINE_TPM2_PROP_FLAG_ATTR(sh_enable,
+ TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_SH_ENABLE);
+DEFINE_TPM2_PROP_FLAG_ATTR(eh_enable,
+ TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_EH_ENABLE);
+DEFINE_TPM2_PROP_FLAG_ATTR(ph_enable_nv,
+ TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_PH_ENABLE_NV);
+DEFINE_TPM2_PROP_FLAG_ATTR(orderly,
+ TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_ORDERLY);
+
+DEFINE_TPM2_PROP_U32_ATTR(lockout_counter, TPM2_PT_LOCKOUT_COUNTER);
+DEFINE_TPM2_PROP_U32_ATTR(max_auth_fail, TPM2_PT_MAX_AUTH_FAIL);
+DEFINE_TPM2_PROP_U32_ATTR(lockout_interval, TPM2_PT_LOCKOUT_INTERVAL);
+DEFINE_TPM2_PROP_U32_ATTR(lockout_recovery, TPM2_PT_LOCKOUT_RECOVERY);
+
+static struct attribute *tpm2_dev_attrs[] = {
+ &dev_attr_owner_auth_set.attr,
+ &dev_attr_endorsement_auth_set.attr,
+ &dev_attr_lockout_auth_set.attr,
+ &dev_attr_disable_clear.attr,
+ &dev_attr_in_lockout.attr,
+ &dev_attr_tpm_generated_eps.attr,
+ &dev_attr_ph_enable.attr,
+ &dev_attr_sh_enable.attr,
+ &dev_attr_eh_enable.attr,
+ &dev_attr_ph_enable_nv.attr,
+ &dev_attr_orderly.attr,
+ &dev_attr_lockout_counter.attr,
+ &dev_attr_max_auth_fail.attr,
+ &dev_attr_lockout_interval.attr,
+ &dev_attr_lockout_recovery.attr,
+ &dev_attr_durations.attr,
+ &dev_attr_timeouts.attr,
+ NULL,
+};
+
+static const struct attribute_group tpm2_dev_group = {
+ .attrs = tpm2_dev_attrs,
};
void tpm_sysfs_add_device(struct tpm_chip *chip)
@@ -289,5 +387,7 @@ void tpm_sysfs_add_device(struct tpm_chip *chip)
* removal so that no callbacks are running or can run again
*/
WARN_ON(chip->groups_cnt != 0);
- chip->groups[chip->groups_cnt++] = &tpm_dev_group;
+ chip->groups[chip->groups_cnt++] =
+ (chip->flags & TPM_CHIP_FLAG_TPM2) ?
+ &tpm2_dev_group : &tpm1_dev_group;
}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 3e32d5b..cf4359a 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -127,6 +127,36 @@ enum tpm2_capabilities {
TPM2_CAP_TPM_PROPERTIES = 6,
};
+enum tpm2_properties {
+ TPM2_PT_NONE = 0,
+ TPM2_PT_GROUP = 0x100,
+ TPM2_PT_FIXED = TPM2_PT_GROUP,
+ TPM2_PT_VAR = TPM2_PT_GROUP * 2,
+ TPM2_PT_PERMANENT = TPM2_PT_VAR + 0,
+ TPM2_PT_STARTUP_CLEAR = TPM2_PT_VAR + 1,
+ TPM2_PT_LOCKOUT_COUNTER = TPM2_PT_VAR + 14,
+ TPM2_PT_MAX_AUTH_FAIL = TPM2_PT_VAR + 15,
+ TPM2_PT_LOCKOUT_INTERVAL = TPM2_PT_VAR + 16,
+ TPM2_PT_LOCKOUT_RECOVERY = TPM2_PT_VAR + 17,
+};
+
+enum tpm2_attr_permanent {
+ TPM2_ATTR_OWNER_AUTH_SET = BIT(0),
+ TPM2_ATTR_ENDORSEMENT_AUTH_SET = BIT(1),
+ TPM2_ATTR_LOCKOUT_AUTH_SET = BIT(2),
+ TPM2_ATTR_DISABLE_CLEAR = BIT(8),
+ TPM2_ATTR_IN_LOCKOUT = BIT(9),
+ TPM2_ATTR_TPM_GENERATED_EPS = BIT(10),
+};
+
+enum tpm2_attr_startup_clear {
+ TPM2_ATTR_PH_ENABLE = BIT(0),
+ TPM2_ATTR_SH_ENABLE = BIT(1),
+ TPM2_ATTR_EH_ENABLE = BIT(2),
+ TPM2_ATTR_PH_ENABLE_NV = BIT(3),
+ TPM2_ATTR_ORDERLY = BIT(31),
+};
+
enum tpm2_startup_types {
TPM2_SU_CLEAR = 0x0000,
TPM2_SU_STATE = 0x0001,
--
2.6.6