linux-kernel - [PATCH 1/2] tpm: add sysfs attributes for tpm2

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Date:	Thu, 14 Jul 2016 18:51:35 -0700
From:	Andrey Pronin <apronin@...omium.org>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Andrey Pronin <apronin@...omium.org>, groeck@...omium.org,
	smbarber@...omium.org, dianders@...omium.org
Subject: [PATCH 1/2] tpm: add sysfs attributes for tpm2

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@...omium.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