[PATCH v7 07/10] tpm: Introduce TPM_CHIP_FLAG_VIRTUAL

Stefan Berger
2016-03-12T02:51:37Z

Introduce TPM_CHIP_FLAG_VIRTUAL to be used when the chip device has no
parent device. Also adapt tpm_chip_alloc so that it can be called with
parent device being NULL.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Reviewed-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
---
drivers/char/tpm/tpm-chip.c | 9 +++++----
drivers/char/tpm/tpm-sysfs.c | 15 +++++++++++----
drivers/char/tpm/tpm.h | 5 +++--
3 files changed, 19 insertions(+), 10 deletions(-)

diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c
index f62c851..e4e1fad 100644
--- a/drivers/char/tpm/tpm-chip.c
+++ b/drivers/char/tpm/tpm-chip.c
@@ -170,9 +170,7 @@ struct tpm_chip *tpm_chip_alloc(struct device *dev,
chip->dev.class = tpm_class;
chip->dev.release = tpm_dev_release;
chip->dev.parent = dev;
-#ifdef CONFIG_ACPI
chip->dev.groups = chip->groups;
-#endif

if (chip->dev_num == 0)
chip->dev.devt = MKDEV(MISC_MAJOR, TPM_MINOR);
@@ -183,6 +181,9 @@ struct tpm_chip *tpm_chip_alloc(struct device *dev,
if (rc)
goto out;

+ if (!dev)
+ chip->flags |= TPM_CHIP_FLAG_VIRTUAL;
+
cdev_init(&chip->cdev, &tpm_fops);
chip->cdev.owner = THIS_MODULE;
chip->cdev.kobj.parent = &chip->dev.kobj;
@@ -327,7 +328,7 @@ int tpm_chip_register(struct tpm_chip *chip)

chip->flags |= TPM_CHIP_FLAG_REGISTERED;

- if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) {
+ if (!(chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL))) {
rc = __compat_only_sysfs_link_entry_to_kobj(
&chip->dev.parent->kobj, &chip->dev.kobj, "ppi");
if (rc && rc != -ENOENT) {
@@ -361,7 +362,7 @@ void tpm_chip_unregister(struct tpm_chip *chip)
if (!(chip->flags & TPM_CHIP_FLAG_REGISTERED))
return;

- if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
+ if (!(chip->flags & (TPM_CHIP_FLAG_TPM2 | TPM_CHIP_FLAG_VIRTUAL)))
sysfs_remove_link(&chip->dev.parent->kobj, "ppi");

tpm1_chip_unregister(chip);
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index 34e7fc7..9ee0f4d 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -283,9 +283,15 @@ static const struct attribute_group tpm_dev_group = {

int tpm_sysfs_add_device(struct tpm_chip *chip)
{
- int err;
- err = sysfs_create_group(&chip->dev.parent->kobj,
- &tpm_dev_group);
+ int err = 0;
+
+ if (!(chip->flags & TPM_CHIP_FLAG_VIRTUAL))
+ err = sysfs_create_group(&chip->dev.parent->kobj,
+ &tpm_dev_group);
+ else {
+ dev_set_drvdata(&chip->dev, chip);
+ chip->groups[chip->groups_cnt++] = &tpm_dev_group;
+ }

if (err)
dev_err(&chip->dev,
@@ -300,5 +306,6 @@ void tpm_sysfs_del_device(struct tpm_chip *chip)
* synchronizes this removal so that no callbacks are running or can
* run again
*/
- sysfs_remove_group(&chip->dev.parent->kobj, &tpm_dev_group);
+ if (!(chip->flags & TPM_CHIP_FLAG_VIRTUAL))
+ sysfs_remove_group(&chip->dev.parent->kobj, &tpm_dev_group);
}
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 928b47f..f197eef 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -164,6 +164,7 @@ struct tpm_vendor_specific {
enum tpm_chip_flags {
TPM_CHIP_FLAG_REGISTERED = BIT(0),
TPM_CHIP_FLAG_TPM2 = BIT(1),
+ TPM_CHIP_FLAG_VIRTUAL = BIT(2),
};

struct tpm_chip {
@@ -189,9 +190,9 @@ struct tpm_chip {

struct dentry **bios_dir;

-#ifdef CONFIG_ACPI
- const struct attribute_group *groups[2];
+ const struct attribute_group *groups[3];
unsigned int groups_cnt;
+#ifdef CONFIG_ACPI
acpi_handle acpi_dev_handle;
char ppi_version[TPM_PPI_VERSION_LEN + 1];
#endif /* CONFIG_ACPI */
--
2.4.3