[linux-yocto] [PATCH 2/8] tpm: move the PPI attributes to character device directory.
jonathan.yong at intel.com
jonathan.yong at intel.com
Mon Jun 13 21:14:04 PDT 2016
From: Jarkko Sakkinen <jarkko.sakkinen at linux.intel.com>
Moved PPI attributes to the character device directory. This aligns with
the sysfs guidelines and makes them race free because they are created
atomically with the character device as part of device_register().The
character device and the sysfs attributes appear at the same time to the
user space.
As part of this change we enable PPI attributes also for TPM 2.0
devices. In order to retain backwards compatibility with TPM 1.x
devices, a symlink is created to the platform device directory.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen at linux.intel.com>
Reviewed-by: Jason Gunthorpe <jason.gunthorpe at obsidianresearch.com>
Tested-by: Mimi Zohar <zohar at linux.vnet.ibm.com> (on TPM 1.2)
Tested-by: Chris J Arges <chris.j.arges at canonical.com>
Tested-by: Colin Ian King <colin.king at canonical.com>
Signed-off-by: Peter Huewe <peterhuewe at gmx.de>
(cherry picked from commit 9b774d5cf2db4b27324784e8d2c95a06cdf82373)
Signed-off-by: Yong, Jonathan <jonathan.yong at intel.com>
---
drivers/char/tpm/tpm-chip.c | 24 ++++++++++++++++--------
drivers/char/tpm/tpm.h | 17 ++++++-----------
drivers/char/tpm/tpm_ppi.c | 34 +++++++++++-----------------------
3 files changed, 33 insertions(+), 42 deletions(-)
diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index 1082d4b..f26b0ae 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -119,6 +119,9 @@ struct tpm_chip *tpmm_chip_alloc(struct device *dev,
chip->dev.class = tpm_class;
chip->dev.release = tpm_dev_release;
chip->dev.parent = chip->pdev;
+#ifdef CONFIG_ACPI
+ chip->dev.groups = chip->groups;
+#endif
if (chip->dev_num == 0)
chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);
@@ -182,12 +185,6 @@ static int tpm1_chip_register(struct tpm_chip *chip)
if (rc)
return rc;
- rc = tpm_add_ppi(chip);
- if (rc) {
- tpm_sysfs_del_device(chip);
- return rc;
- }
-
chip->bios_dir = tpm_bios_log_setup(chip->devname);
return 0;
@@ -201,8 +198,6 @@ static void tpm1_chip_unregister(struct tpm_chip *chip)
if (chip->bios_dir)
tpm_bios_log_teardown(chip->bios_dir);
- tpm_remove_ppi(chip);
-
tpm_sysfs_del_device(chip);
}
@@ -225,10 +220,20 @@ int tpm_chip_register(struct tpm_chip *chip)
if (rc)
return rc;
+ tpm_add_ppi(chip);
+
rc = tpm_dev_add_device(chip);
if (rc)
goto out_err;
+ if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
+ rc = __compat_only_sysfs_link_entry_to_kobj(&chip->pdev->kobj,
+ &chip->dev.kobj,
+ "ppi");
+ if (rc)
+ goto out_err;
+ }
+
/* Make the chip available. */
spin_lock(&driver_lock);
list_add_rcu(&chip->list, &tpm_chip_list);
@@ -263,6 +268,9 @@ void tpm_chip_unregister(struct tpm_chip *chip)
spin_unlock(&driver_lock);
synchronize_rcu();
+ if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
+ sysfs_remove_link(&chip->pdev->kobj, "ppi");
+
tpm1_chip_unregister(chip);
tpm_dev_del_device(chip);
}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 39be5ac..36ceb71 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -158,8 +158,7 @@ struct tpm_vendor_specific {
enum tpm_chip_flags {
TPM_CHIP_FLAG_REGISTERED = BIT(0),
- TPM_CHIP_FLAG_PPI = BIT(1),
- TPM_CHIP_FLAG_TPM2 = BIT(2),
+ TPM_CHIP_FLAG_TPM2 = BIT(1),
};
struct tpm_chip {
@@ -182,6 +181,8 @@ struct tpm_chip {
struct dentry **bios_dir;
#ifdef CONFIG_ACPI
+ const struct attribute_group *groups[2];
+ unsigned int groups_cnt;
acpi_handle acpi_dev_handle;
char ppi_version[TPM_PPI_VERSION_LEN + 1];
#endif /* CONFIG_ACPI */
@@ -189,7 +190,7 @@ struct tpm_chip {
struct list_head list;
};
-#define to_tpm_chip(n) container_of(n, struct tpm_chip, vendor)
+#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
static inline void tpm_chip_put(struct tpm_chip *chip)
{
@@ -419,15 +420,9 @@ void tpm_sysfs_del_device(struct tpm_chip *chip);
int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
#ifdef CONFIG_ACPI
-extern int tpm_add_ppi(struct tpm_chip *chip);
-extern void tpm_remove_ppi(struct tpm_chip *chip);
+extern void tpm_add_ppi(struct tpm_chip *chip);
#else
-static inline int tpm_add_ppi(struct tpm_chip *chip)
-{
- return 0;
-}
-
-static inline void tpm_remove_ppi(struct tpm_chip *chip)
+static inline void tpm_add_ppi(struct tpm_chip *chip)
{
}
#endif
diff --git a/drivers/char/tpm/tpm_ppi.c b/drivers/char/tpm/tpm_ppi.c
index 6ca9b5d..692a2c6 100644
--- a/drivers/char/tpm/tpm_ppi.c
+++ b/drivers/char/tpm/tpm_ppi.c
@@ -53,7 +53,7 @@ tpm_eval_dsm(acpi_handle ppi_handle, int func, acpi_object_type type,
static ssize_t tpm_show_ppi_version(struct device *dev,
struct device_attribute *attr, char *buf)
{
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
return scnprintf(buf, PAGE_SIZE, "%s\n", chip->ppi_version);
}
@@ -63,7 +63,7 @@ static ssize_t tpm_show_ppi_request(struct device *dev,
{
ssize_t size = -EINVAL;
union acpi_object *obj;
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETREQ,
ACPI_TYPE_PACKAGE, NULL);
@@ -100,7 +100,7 @@ static ssize_t tpm_store_ppi_request(struct device *dev,
int func = TPM_PPI_FN_SUBREQ;
union acpi_object *obj, tmp;
union acpi_object argv4 = ACPI_INIT_DSM_ARGV4(1, &tmp);
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
/*
* the function to submit TPM operation request to pre-os environment
@@ -156,7 +156,7 @@ static ssize_t tpm_show_ppi_transition_action(struct device *dev,
.buffer.length = 0,
.buffer.pointer = NULL
};
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
static char *info[] = {
"None",
@@ -197,7 +197,7 @@ static ssize_t tpm_show_ppi_response(struct device *dev,
acpi_status status = -EINVAL;
union acpi_object *obj, *ret_obj;
u64 req, res;
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
obj = tpm_eval_dsm(chip->acpi_dev_handle, TPM_PPI_FN_GETRSP,
ACPI_TYPE_PACKAGE, NULL);
@@ -296,7 +296,7 @@ static ssize_t tpm_show_ppi_tcg_operations(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
return show_ppi_operations(chip->acpi_dev_handle, buf, 0,
PPI_TPM_REQ_MAX);
@@ -306,7 +306,7 @@ static ssize_t tpm_show_ppi_vs_operations(struct device *dev,
struct device_attribute *attr,
char *buf)
{
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
return show_ppi_operations(chip->acpi_dev_handle, buf, PPI_VS_REQ_START,
PPI_VS_REQ_END);
@@ -334,17 +334,16 @@ static struct attribute_group ppi_attr_grp = {
.attrs = ppi_attrs
};
-int tpm_add_ppi(struct tpm_chip *chip)
+void tpm_add_ppi(struct tpm_chip *chip)
{
union acpi_object *obj;
- int rc;
if (!chip->acpi_dev_handle)
- return 0;
+ return;
if (!acpi_check_dsm(chip->acpi_dev_handle, tpm_ppi_uuid,
TPM_PPI_REVISION_ID, 1 << TPM_PPI_FN_VERSION))
- return 0;
+ return;
/* Cache PPI version string. */
obj = acpi_evaluate_dsm_typed(chip->acpi_dev_handle, tpm_ppi_uuid,
@@ -356,16 +355,5 @@ int tpm_add_ppi(struct tpm_chip *chip)
ACPI_FREE(obj);
}
- rc = sysfs_create_group(&chip->pdev->kobj, &ppi_attr_grp);
-
- if (!rc)
- chip->flags |= TPM_CHIP_FLAG_PPI;
-
- return rc;
-}
-
-void tpm_remove_ppi(struct tpm_chip *chip)
-{
- if (chip->flags & TPM_CHIP_FLAG_PPI)
- sysfs_remove_group(&chip->pdev->kobj, &ppi_attr_grp);
+ chip->groups[chip->groups_cnt++] = &ppi_attr_grp;
}
--
2.7.3
More information about the linux-yocto
mailing list