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From: Stephen Boyd <swboyd@chromium.org>
To: Peter Huewe <peterhuewe@gmx.de>,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: Andrey Pronin <apronin@chromium.org>,
	linux-kernel@vger.kernel.org, Jason Gunthorpe <jgg@ziepe.ca>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-integrity@vger.kernel.org, devicetree@vger.kernel.org,
	Duncan Laurie <dlaurie@chromium.org>,
	Guenter Roeck <groeck@chromium.org>
Subject: [PATCH 7/8] tpm: add sysfs attributes for tpm2
Date: Thu, 13 Jun 2019 11:09:30 -0700
Message-ID: <20190613180931.65445-8-swboyd@chromium.org> (raw)
In-Reply-To: <20190613180931.65445-1-swboyd@chromium.org>

From: Andrey Pronin <apronin@chromium.org>

Add sysfs attributes in TPM2.0 case for:
 - TPM_PT_PERMANENT flags
 - TPM_PT_STARTUP_CLEAR flags
 - lockout-related properties

Signed-off-by: Andrey Pronin <apronin@chromium.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
---

This was sent before as https://lkml.kernel.org/r/1469678766-117528-1-git-send-email-apronin@chromium.org
and Jarkko asked that the commit text be filled out more. I'll work with
Andrey to do so, but I'm including it here so we can see if there are
other comments.

 drivers/char/tpm/tpm-sysfs.c | 130 ++++++++++++++++++++++++++++++++---
 drivers/char/tpm/tpm.h       |  29 +++++++-
 2 files changed, 148 insertions(+), 11 deletions(-)

diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 533a260d744e..e9f6f7960023 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -314,7 +314,7 @@ 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,
@@ -328,22 +328,132 @@ 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,
 };
 
-void tpm_sysfs_add_device(struct tpm_chip *chip)
+struct tpm2_prop_flag_dev_attribute {
+	struct device_attribute attr;
+	u32 property_id;
+	u32 flag_mask;
+};
+
+struct tpm2_prop_u32_dev_attribute {
+	struct device_attribute attr;
+	u32 property_id;
+};
+
+static ssize_t tpm2_prop_flag_show(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
 {
-	/* XXX: If you wish to remove this restriction, you must first update
-	 * tpm_sysfs to explicitly lock chip->ops.
-	 */
-	if (chip->flags & TPM_CHIP_FLAG_TPM2)
-		return;
+	struct tpm2_prop_flag_dev_attribute *pa =
+		container_of(attr, struct tpm2_prop_flag_dev_attribute, attr);
+	u32 flags;
+	ssize_t rc;
+
+	rc = tpm2_get_tpm_pt(to_tpm_chip(dev), pa->property_id, &flags,
+			     "reading property");
+	if (rc)
+		return 0;
+
+	return sprintf(buf, "%d\n", !!(flags & pa->flag_mask));
+}
+
+static ssize_t tpm2_prop_u32_show(struct device *dev,
+				  struct device_attribute *attr,
+				  char *buf)
+{
+	struct tpm2_prop_u32_dev_attribute *pa =
+		container_of(attr, struct tpm2_prop_u32_dev_attribute, attr);
+	u32 value;
+	ssize_t rc;
+
+	rc = tpm2_get_tpm_pt(to_tpm_chip(dev), pa->property_id, &value,
+			     "reading property");
+	if (rc)
+		return 0;
+
+	return sprintf(buf, "%u\n", value);
+}
 
+#define TPM2_PROP_FLAG_ATTR(_name, _property_id, _flag_mask)           \
+	struct tpm2_prop_flag_dev_attribute attr_tpm2_prop_##_name = { \
+		__ATTR(_name, S_IRUGO, tpm2_prop_flag_show, NULL),     \
+		_property_id, _flag_mask                               \
+	}
+
+#define TPM2_PROP_U32_ATTR(_name, _property_id)                        \
+	struct tpm2_prop_u32_dev_attribute attr_tpm2_prop_##_name = {  \
+		__ATTR(_name, S_IRUGO, tpm2_prop_u32_show, NULL),      \
+		_property_id                                           \
+	}
+
+TPM2_PROP_FLAG_ATTR(owner_auth_set,
+		    TPM2_PT_PERMANENT, TPM2_ATTR_OWNER_AUTH_SET);
+TPM2_PROP_FLAG_ATTR(endorsement_auth_set,
+		    TPM2_PT_PERMANENT, TPM2_ATTR_ENDORSEMENT_AUTH_SET);
+TPM2_PROP_FLAG_ATTR(lockout_auth_set,
+		    TPM2_PT_PERMANENT, TPM2_ATTR_LOCKOUT_AUTH_SET);
+TPM2_PROP_FLAG_ATTR(disable_clear,
+		    TPM2_PT_PERMANENT, TPM2_ATTR_DISABLE_CLEAR);
+TPM2_PROP_FLAG_ATTR(in_lockout,
+		    TPM2_PT_PERMANENT, TPM2_ATTR_IN_LOCKOUT);
+TPM2_PROP_FLAG_ATTR(tpm_generated_eps,
+		    TPM2_PT_PERMANENT, TPM2_ATTR_TPM_GENERATED_EPS);
+
+TPM2_PROP_FLAG_ATTR(ph_enable,
+		    TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_PH_ENABLE);
+TPM2_PROP_FLAG_ATTR(sh_enable,
+		    TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_SH_ENABLE);
+TPM2_PROP_FLAG_ATTR(eh_enable,
+		    TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_EH_ENABLE);
+TPM2_PROP_FLAG_ATTR(ph_enable_nv,
+		    TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_PH_ENABLE_NV);
+TPM2_PROP_FLAG_ATTR(orderly,
+		    TPM2_PT_STARTUP_CLEAR, TPM2_ATTR_ORDERLY);
+
+TPM2_PROP_U32_ATTR(lockout_counter, TPM2_PT_LOCKOUT_COUNTER);
+TPM2_PROP_U32_ATTR(max_auth_fail, TPM2_PT_MAX_AUTH_FAIL);
+TPM2_PROP_U32_ATTR(lockout_interval, TPM2_PT_LOCKOUT_INTERVAL);
+TPM2_PROP_U32_ATTR(lockout_recovery, TPM2_PT_LOCKOUT_RECOVERY);
+
+#define ATTR_FOR_TPM2_PROP(_name) (&attr_tpm2_prop_##_name.attr.attr)
+static struct attribute *tpm2_dev_attrs[] = {
+	ATTR_FOR_TPM2_PROP(owner_auth_set),
+	ATTR_FOR_TPM2_PROP(endorsement_auth_set),
+	ATTR_FOR_TPM2_PROP(lockout_auth_set),
+	ATTR_FOR_TPM2_PROP(disable_clear),
+	ATTR_FOR_TPM2_PROP(in_lockout),
+	ATTR_FOR_TPM2_PROP(tpm_generated_eps),
+	ATTR_FOR_TPM2_PROP(ph_enable),
+	ATTR_FOR_TPM2_PROP(sh_enable),
+	ATTR_FOR_TPM2_PROP(eh_enable),
+	ATTR_FOR_TPM2_PROP(ph_enable_nv),
+	ATTR_FOR_TPM2_PROP(orderly),
+	ATTR_FOR_TPM2_PROP(lockout_counter),
+	ATTR_FOR_TPM2_PROP(max_auth_fail),
+	ATTR_FOR_TPM2_PROP(lockout_interval),
+	ATTR_FOR_TPM2_PROP(lockout_recovery),
+	&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)
+{
 	/* The sysfs routines rely on an implicit tpm_try_get_ops, device_del
 	 * is called before ops is null'd and the sysfs core synchronizes this
 	 * removal so that no callbacks are running or can run again
 	 */
+	/* FIXME: update tpm_sysfs to explicitly lock chip->ops for TPM 2.0
+	 */
 	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 2cce072f25b5..c58140f86839 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -144,7 +144,34 @@ enum tpm2_capabilities {
 };
 
 enum tpm2_properties {
-	TPM_PT_TOTAL_COMMANDS	= 0x0129,
+	TPM_PT_TOTAL_COMMANDS		= 0x0129,
+	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 {
-- 
Sent by a computer through tubes


  parent reply index

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-13 18:09 [PATCH 0/8] tpm: Add driver for cr50 Stephen Boyd
2019-06-13 18:09 ` [PATCH 1/8] tpm: block messages while suspended Stephen Boyd
2019-06-13 23:26   ` Jason Gunthorpe
2019-06-14 18:12     ` Stephen Boyd
2019-06-17 22:51       ` Jason Gunthorpe
2019-06-21  1:03         ` Stephen Boyd
2019-06-24 14:26           ` Herbert Xu
2019-07-16 18:28             ` Stephen Boyd
2019-06-14 15:27   ` Jarkko Sakkinen
2019-06-14 18:13     ` Stephen Boyd
2019-06-17 16:38       ` Jarkko Sakkinen
2019-06-13 18:09 ` [PATCH 2/8] tpm_tis_core: add optional max xfer size check Stephen Boyd
2019-06-14 15:24   ` Jarkko Sakkinen
2019-06-13 18:09 ` [PATCH 3/8] tpm_tis_spi: add max xfer size Stephen Boyd
2019-06-14 15:25   ` Jarkko Sakkinen
2019-06-13 18:09 ` [PATCH 4/8] dt-bindings: tpm: document properties for cr50 Stephen Boyd
2019-07-09 14:41   ` Rob Herring
2019-06-13 18:09 ` [PATCH 5/8] tpm: add driver for cr50 on SPI Stephen Boyd
2019-06-13 18:09 ` [PATCH 6/8] tpm: Add driver for cr50 on I2C Stephen Boyd
2019-06-13 18:09 ` Stephen Boyd [this message]
2019-06-13 23:30   ` [PATCH 7/8] tpm: add sysfs attributes for tpm2 Jason Gunthorpe
2019-06-14 15:31   ` Jarkko Sakkinen
2019-06-13 18:09 ` [PATCH 8/8] tpm: add legacy " Stephen Boyd
2019-06-13 23:44   ` Jason Gunthorpe

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