lkml.org 
[lkml]   [2014]   [Nov]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v6 10/10] tpm: TPM 2.0 sysfs attributes
Date
Manadatory sysfs attributes for TPM 2.0 devices so that it is easy
to check whether storage hierarchies are enabled.

Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
Documentation/ABI/stable/sysfs-class-tpm2 | 57 +++++++++++
drivers/char/tpm/Makefile | 2 +-
drivers/char/tpm/tpm-chip.c | 15 ++-
drivers/char/tpm/tpm-dev.c | 6 +-
drivers/char/tpm/tpm.h | 19 ++++
drivers/char/tpm/tpm2-sysfs.c | 152 ++++++++++++++++++++++++++++++
drivers/char/tpm/tpm_crb.c | 20 ++--
7 files changed, 248 insertions(+), 23 deletions(-)
create mode 100644 Documentation/ABI/stable/sysfs-class-tpm2
create mode 100644 drivers/char/tpm/tpm2-sysfs.c

diff --git a/Documentation/ABI/stable/sysfs-class-tpm2 b/Documentation/ABI/stable/sysfs-class-tpm2
new file mode 100644
index 0000000..301ab2e
--- /dev/null
+++ b/Documentation/ABI/stable/sysfs-class-tpm2
@@ -0,0 +1,57 @@
+What: /sys/class/misc/tpmX/device/
+Date: October 2014
+KernelVersion: 3.19
+Contact: tpmdd-devel@lists.sf.net
+Description: The device/ directory under a specific TPM instance exposes
+ the properties of that TPM chip.
+
+What: /sys/class/misc/tpmX/device/family
+Date: October 2014
+KernelVersion: 3.19
+Contact: tpmdd-devel@lists.sf.net
+Description: The protocol family in the major.minor format.
+
+What: /sys/class/misc/tpmX/device/sh_enabled
+Date: October 2014
+KernelVersion: 3.19
+Contact: tpmdd-devel@lists.sf.net
+Description: The "sh_enabled" property prints a '1' if the Storage Hierarchy
+ is enabled, i.e. if PM_PT_STARTUP_CLEAR.shEnable is set.
+
+What: /sys/class/misc/tpmX/device/sh_owned
+Date: October 2014
+KernelVersion: 3.19
+Contact: tpmdd-devel@lists.sf.net
+Description: The "sh_owned" property prints a '1' if the ownership of the
+ Storage Hierarchy has been taken, i.e. if
+ TPM_PT_PERMANENT.ownerAuthSet is set.
+
+What: /sys/class/misc/tpmX/device/eh_enabled
+Date: October 2014
+KernelVersion: 3.19
+Contact: tpmdd-devel@lists.sf.net
+Description: The "eh_enabled" property prints a '1' if the Endorsement
+ Hierarchy is enabled, i.e if PM_PT_STARTUP_CLEAR.ehEnable is
+ set.
+
+What: /sys/class/misc/tpmX/device/eh_owned
+Date: October 2014
+KernelVersion: 3.19
+Contact: tpmdd-devel@lists.sf.net
+Description: The "eh_owned" property prints a '1' if the ownership of the
+ Endrosoment Hierarchy has been taken, i.e if
+ TPM_PT_PERMANENT.endorsementAuthSet is set.
+
+What: /sys/class/misc/tpmX/device/manufacturer
+Date: October 2014
+KernelVersion: 3.19
+Contact: tpmdd-devel@lists.sf.net
+Description: The "manufacturer" property prints the vendor ID of the TPM
+ manufacturer.
+
+What: /sys/class/misc/tpmX/device/firmware
+Date: October 2014
+KernelVersion: 3.19
+Contact: tpmdd-devel@lists.sf.net
+Description: The property prints the vendor-specific value indicating the
+ version of the firmware.
diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
index e6d26dd..15e3b4c 100644
--- a/drivers/char/tpm/Makefile
+++ b/drivers/char/tpm/Makefile
@@ -2,7 +2,7 @@
# Makefile for the kernel tpm device drivers.
#
obj-$(CONFIG_TCG_TPM) += tpm.o
-tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o
+tpm-y := tpm-interface.o tpm-dev.o tpm-sysfs.o tpm-chip.o tpm2-cmd.o tpm2-sysfs.o
tpm-$(CONFIG_ACPI) += tpm_ppi.o

ifdef CONFIG_ACPI
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 811e431..b334252 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -144,14 +144,12 @@ int tpm_chip_register(struct tpm_chip *chip)
if (rc)
return rc;

- /* Populate sysfs for TPM1 devices. */
- if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
- rc = tpm_add_ppi(chip);
- if (rc)
- goto out_err;
+ rc = tpm_add_ppi(chip);
+ if (rc)
+ goto out_err;

+ if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
chip->bios_dir = tpm_bios_log_setup(chip->devname);
- }

/* Make the chip available. */
spin_lock(&driver_lock);
@@ -182,8 +180,9 @@ void tpm_chip_unregister(struct tpm_chip *chip)
spin_unlock(&driver_lock);
synchronize_rcu();

- /* Clean up sysfs for TPM1 devices. */
- if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
+ if (chip->flags & TPM_CHIP_FLAG_TPM2) {
+ tpm_remove_ppi(chip);
+ } else {
if (chip->bios_dir)
tpm_bios_log_teardown(chip->bios_dir);
tpm_remove_ppi(chip);
diff --git a/drivers/char/tpm/tpm-dev.c b/drivers/char/tpm/tpm-dev.c
index 42b61776..d567ec6 100644
--- a/drivers/char/tpm/tpm-dev.c
+++ b/drivers/char/tpm/tpm-dev.c
@@ -23,6 +23,7 @@
#include "tpm.h"

ATTRIBUTE_GROUPS(tpm_dev);
+ATTRIBUTE_GROUPS(tpm2_dev);

struct file_priv {
struct tpm_chip *chip;
@@ -201,7 +202,10 @@ int tpm_dev_add_device(struct tpm_chip *chip)
else
chip->dev.devt = MKDEV(MAJOR(tpm_devt), chip->dev_num);

- chip->dev.groups = tpm_dev_groups;
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ chip->dev.groups = tpm2_dev_groups;
+ else
+ chip->dev.groups = tpm_dev_groups;

dev_set_name(&chip->dev, chip->devname);

diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index feadbff..fc37f88 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -108,6 +108,24 @@ enum tpm2_capabilities {
TPM2_CAP_TPM_PROPERTIES = 6,
};

+enum tpm2_tpm_properties {
+ TPM2_PT_MANUFACTURER = 0x00000105,
+ TPM2_PT_FIRMWARE_VERSION_1 = 0x0000010C,
+ TPM2_PT_FIRMWARE_VERSION_2 = 0x0000010D,
+ TPM2_PT_PERMANENT = 0x00000200,
+ TPM2_PT_STARTUP_CLEAR = 0x00000201,
+};
+
+enum tpm2_pt_startup_clear {
+ TPM2_PT_SC_SH_ENABLE = BIT(1),
+ TPM2_PT_SC_EH_ENABLE = BIT(2),
+};
+
+enum tpm2_pt_permanent {
+ TPM2_PT_PM_OWNER_AUTH_SET = BIT(0),
+ TPM2_PT_PM_ENDORSEMENT_AUTH_SET = BIT(1),
+};
+
enum tpm2_startup_types {
TPM2_SU_CLEAR = 0x0000,
TPM2_SU_STATE = 0x0001,
@@ -381,6 +399,7 @@ struct tpm_cmd_t {
extern struct class *tpm_class;
extern dev_t tpm_devt;
extern struct attribute *tpm_dev_attrs[];
+extern struct attribute *tpm2_dev_attrs[];

ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
diff --git a/drivers/char/tpm/tpm2-sysfs.c b/drivers/char/tpm/tpm2-sysfs.c
new file mode 100644
index 0000000..9e5e2e3
--- /dev/null
+++ b/drivers/char/tpm/tpm2-sysfs.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * Authors:
+ * Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
+ *
+ * TPM2 sysfs attributes
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ */
+#include <linux/device.h>
+#include <linux/slab.h>
+#include "tpm.h"
+
+static ssize_t sh_enabled_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
+ u32 value;
+ ssize_t rc;
+
+ rc = tpm2_get_tpm_pt(chip, TPM2_PT_STARTUP_CLEAR, &value,
+ "could not retrieve STARTUP_CLEAR property");
+ if (rc)
+ return 0;
+
+ rc = sprintf(buf, "%d\n", (value & TPM2_PT_SC_SH_ENABLE) > 0);
+ return rc;
+}
+static DEVICE_ATTR_RO(sh_enabled);
+
+static ssize_t sh_owned_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
+ u32 value;
+ ssize_t rc;
+
+ rc = tpm2_get_tpm_pt(chip, TPM2_PT_PERMANENT, &value,
+ "could not retrieve PERMANENT property");
+ if (rc)
+ return 0;
+
+ rc = sprintf(buf, "%d\n", (value & TPM2_PT_PM_OWNER_AUTH_SET) > 0);
+ return rc;
+}
+static DEVICE_ATTR_RO(sh_owned);
+
+static ssize_t eh_enabled_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
+ u32 value;
+ ssize_t rc;
+
+ rc = tpm2_get_tpm_pt(chip, TPM2_PT_STARTUP_CLEAR, &value,
+ "could not retrieve STARTUP_CLEAR property");
+ if (rc)
+ return 0;
+
+ rc = sprintf(buf, "%d\n", (value & TPM2_PT_SC_EH_ENABLE) > 0);
+ return rc;
+}
+static DEVICE_ATTR_RO(eh_enabled);
+
+static ssize_t eh_owned_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
+ u32 value;
+ ssize_t rc;
+
+ rc = tpm2_get_tpm_pt(chip, TPM2_PT_PERMANENT, &value,
+ "could not retrieve PERMANENT property");
+ if (rc)
+ return 0;
+
+ rc = sprintf(buf, "%d\n", (value & TPM2_PT_PM_ENDORSEMENT_AUTH_SET) > 0);
+ return rc;
+}
+static DEVICE_ATTR_RO(eh_owned);
+
+static ssize_t manufacturer_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
+ u32 manufacturer;
+ ssize_t rc;
+ char *str = buf;
+
+ rc = tpm2_get_tpm_pt(chip, TPM2_PT_MANUFACTURER, (u32 *) &manufacturer,
+ "could not retrieve MANUFACTURER property");
+ if (rc)
+ return 0;
+
+ str += sprintf(str, "0x%08x\n", be32_to_cpu(manufacturer));
+
+ return str - buf;
+}
+static DEVICE_ATTR_RO(manufacturer);
+
+static ssize_t firmware_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = container_of(dev, struct tpm_chip, dev);
+ u32 firmware1;
+ u32 firmware2;
+ ssize_t rc;
+ char *str = buf;
+
+ rc = tpm2_get_tpm_pt(chip, TPM2_PT_FIRMWARE_VERSION_1, (u32 *) &firmware1,
+ "could not retrieve FIRMWARE_VERSION_1 property");
+ if (rc)
+ return 0;
+
+ rc = tpm2_get_tpm_pt(chip, TPM2_PT_FIRMWARE_VERSION_2, (u32 *) &firmware2,
+ "could not retrieve FIRMWARE_VERSION_2 property");
+ if (rc)
+ return 0;
+
+ str += sprintf(str, "0x%08x.0x%08x\n", firmware1, firmware2);
+
+ return str - buf;
+}
+static DEVICE_ATTR_RO(firmware);
+
+static ssize_t family_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ char *str = buf;
+
+ str += sprintf(str, "2.0\n");
+
+ return str - buf;
+}
+static DEVICE_ATTR_RO(family);
+
+struct attribute *tpm2_dev_attrs[] = {
+ &dev_attr_sh_enabled.attr,
+ &dev_attr_sh_owned.attr,
+ &dev_attr_eh_enabled.attr,
+ &dev_attr_eh_owned.attr,
+ &dev_attr_manufacturer.attr,
+ &dev_attr_firmware.attr,
+ &dev_attr_family.attr,
+ NULL,
+};
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index e36f637..c9b95c0 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -167,7 +167,7 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t len)
cca = priv->cca;

if (len > le32_to_cpu(cca->cmd_size)) {
- dev_err(chip->dev,
+ dev_err(&chip->dev,
"invalid command count value %x %zx\n",
(unsigned int) len,
(size_t) le32_to_cpu(cca->cmd_size));
@@ -198,7 +198,7 @@ static void crb_cancel(struct tpm_chip *chip)
wmb();

if (crb_do_acpi_start(chip))
- dev_err(chip->dev, "ACPI Start failed\n");
+ dev_err(&chip->dev, "ACPI Start failed\n");

cca->cancel = 0;
}
@@ -231,24 +231,22 @@ static int crb_acpi_add(struct acpi_device *device)
int rc;

chip = tpmm_chip_alloc(dev, &tpm_crb);
- if (IS_ERR(chip)) {
- dev_err(dev, "allocating chip failed\n");
+ if (IS_ERR(chip))
return PTR_ERR(chip);
- }

chip->flags = TPM_CHIP_FLAG_TPM2;

status = acpi_get_table(ACPI_SIG_TPM2, 1,
(struct acpi_table_header **) &buf);
if (ACPI_FAILURE(status)) {
- dev_err(dev, "could not get TPM2 ACPI table\n");
+ dev_err(dev, "failed to get TPM2 ACPI table\n");
return -ENODEV;
}

priv = (struct crb_priv *) devm_kzalloc(dev, sizeof(struct crb_priv),
GFP_KERNEL);
if (!priv) {
- dev_err(dev, "allocating memory failed\n");
+ dev_err(dev, "failed to devm_kzalloc for private data\n");
return -ENOMEM;
}

@@ -285,16 +283,12 @@ static int crb_acpi_add(struct acpi_device *device)
chip->acpi_dev_handle = device->handle;

rc = tpm2_do_selftest(chip);
- if (rc) {
- dev_err(dev, "self-test failed\n");
+ if (rc)
return rc;
- }

rc = tpm_chip_register(chip);
- if (rc) {
- dev_err(dev, "registering the chip failed\n");
+ if (rc)
return rc;
- }

return 0;
}
--
2.1.0


\
 
 \ /
  Last update: 2014-11-10 14:21    [W:0.130 / U:3.388 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site