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Subject[PATCH 1/2] tpm: add sysfs attributes for tpm2
Date
Break sysfs attributes into common and TPM 1.2/2.0-specific, and
create sysfs groups for TPM2.0.

Signed-off-by: Andrey Pronin <apronin@chromium.org>
---
drivers/char/tpm/tpm-chip.c | 48 ++++++++++++++++++++++++++++----------------
drivers/char/tpm/tpm-sysfs.c | 24 ++++++++++++++++++++--
2 files changed, 53 insertions(+), 19 deletions(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 5a2f043..6c72671 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;
@@ -300,14 +298,21 @@ static void tpm1_chip_unregister(struct tpm_chip *chip)
static void tpm_del_legacy_sysfs(struct tpm_chip *chip)
{
struct attribute **i;
+ int ngrp;

- if (chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL))
+ if (chip->flags & TPM_CHIP_FLAG_VIRTUAL)
return;

- sysfs_remove_link(&chip->dev.parent->kobj, "ppi");
-
- for (i = chip->groups[0]->attrs; *i != NULL; ++i)
- sysfs_remove_link(&chip->dev.parent->kobj, (*i)->name);
+ for (ngrp = 0; ngrp < chip->groups_cnt; ++ngrp) {
+ if (chip->groups[ngrp]->name) {
+ sysfs_remove_link(&chip->dev.parent->kobj,
+ chip->groups[ngrp]->name);
+ } else {
+ for (i = chip->groups[ngrp]->attrs; *i != NULL; ++i)
+ sysfs_remove_link(&chip->dev.parent->kobj,
+ (*i)->name);
+ }
+ }
}

/* For compatibility with legacy sysfs paths we provide symlinks from the
@@ -317,20 +322,27 @@ static void tpm_del_legacy_sysfs(struct tpm_chip *chip)
static int tpm_add_legacy_sysfs(struct tpm_chip *chip)
{
struct attribute **i;
- int rc;
+ int rc = 0;
+ int ngrp;

- if (chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL))
+ if (chip->flags & TPM_CHIP_FLAG_VIRTUAL)
return 0;

- rc = __compat_only_sysfs_link_entry_to_kobj(
- &chip->dev.parent->kobj, &chip->dev.kobj, "ppi");
- if (rc && rc != -ENOENT)
- return rc;
-
/* All the names from tpm-sysfs */
- for (i = chip->groups[0]->attrs; *i != NULL; ++i) {
- rc = __compat_only_sysfs_link_entry_to_kobj(
- &chip->dev.parent->kobj, &chip->dev.kobj, (*i)->name);
+ for (ngrp = 0; ngrp < chip->groups_cnt; ++ngrp) {
+ if (chip->groups[ngrp]->name) {
+ rc = __compat_only_sysfs_link_entry_to_kobj(
+ &chip->dev.parent->kobj, &chip->dev.kobj,
+ chip->groups[ngrp]->name);
+ } else {
+ for (i = chip->groups[ngrp]->attrs;
+ (*i != NULL) && !rc;
+ ++i)
+ rc = __compat_only_sysfs_link_entry_to_kobj(
+ &chip->dev.parent->kobj,
+ &chip->dev.kobj,
+ (*i)->name);
+ }
if (rc) {
tpm_del_legacy_sysfs(chip);
return rc;
@@ -354,6 +366,8 @@ int tpm_chip_register(struct tpm_chip *chip)
{
int 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..95ce90d 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -265,6 +265,12 @@ static ssize_t timeouts_show(struct device *dev, struct device_attribute *attr,
static DEVICE_ATTR_RO(timeouts);

static struct attribute *tpm_dev_attrs[] = {
+ &dev_attr_durations.attr,
+ &dev_attr_timeouts.attr,
+ NULL,
+};
+
+static struct attribute *tpm1_dev_attrs[] = {
&dev_attr_pubek.attr,
&dev_attr_pcrs.attr,
&dev_attr_enabled.attr,
@@ -273,8 +279,10 @@ static struct attribute *tpm_dev_attrs[] = {
&dev_attr_temp_deactivated.attr,
&dev_attr_caps.attr,
&dev_attr_cancel.attr,
- &dev_attr_durations.attr,
- &dev_attr_timeouts.attr,
+ NULL,
+};
+
+static struct attribute *tpm2_dev_attrs[] = {
NULL,
};

@@ -282,6 +290,14 @@ 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 const struct attribute_group tpm2_dev_group = {
+ .attrs = tpm2_dev_attrs,
+};
+
void tpm_sysfs_add_device(struct tpm_chip *chip)
{
/* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
@@ -290,4 +306,8 @@ void tpm_sysfs_add_device(struct tpm_chip *chip)
*/
WARN_ON(chip->groups_cnt != 0);
chip->groups[chip->groups_cnt++] = &tpm_dev_group;
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ chip->groups[chip->groups_cnt++] = &tpm2_dev_group;
+ else
+ chip->groups[chip->groups_cnt++] = &tpm1_dev_group;
}
--
2.6.6
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