On Mon, Apr 11, 2016 at 11:43:58AM +0300, Jarkko Sakkinen wrote:
> On Thu, Apr 07, 2016 at 11:49:44AM -0400, Stefan Berger wrote:
> > On 04/07/2016 08:35 AM, Jarkko Sakkinen wrote:
> > >On Tue, Mar 29, 2016 at 02:19:12PM -0400, Stefan Berger wrote:
> > >>This patch implements a proxy driver for supporting multiple emulated TPMs
> > >>in a system.
> > >>
> > >>The driver implements a device /dev/vtpmx that is used to created
> > >>a client device pair /dev/tpmX (e.g., /dev/tpm10) and a server side that
> > >>is accessed using a file descriptor returned by an ioctl.
> > >>The device /dev/tpmX is the usual TPM device created by the core TPM
> > >>driver. Applications or kernel subsystems can send TPM commands to it
> > >>and the corresponding server-side file descriptor receives these
> > >>commands and delivers them to an emulated TPM.
> > >>
> > >>Signed-off-by: Stefan Berger <stef...@linux.vnet.ibm.com>
> > >>CC: linux-ker...@vger.kernel.org
> > >>CC: linux-doc@vger.kernel.org
> > >>CC: linux-...@vger.kernel.org
> > >Reviewed-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
> > >Tested-by: Jarkko Sakkinen <jarkko.sakki...@linux.intel.com>
> >
> > Thanks. So I can post a v10 where I have to re-introduce the priv field but
> > put it into the tpm_chip struct. Obviously it needs this field. I am not
> > sure whether you'll let me take the Reviewed-by and Tested-by, though?
>
> Lets hold for them then. I'll do retest when I get the new series.
Lets just fix the sysfs stuff the same way we fixed ppi and be done
with this issue.
Something that looks kinda like this untested thing:
diff --git a/drivers/char/tpm/tpm-sysfs.c b/drivers/char/tpm/tpm-sysfs.c
index a7c3473c3421..51e898be4307 100644
--- a/drivers/char/tpm/tpm-sysfs.c
+++ b/drivers/char/tpm/tpm-sysfs.c
@@ -36,7 +36,7 @@ static ssize_t pubek_show(struct device *dev, struct
device_attribute *attr,
int i, rc;
char *str = buf;
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
tpm_cmd.header.in = tpm_readpubek_header;
err = tpm_transmit_cmd(chip, &tpm_cmd, READ_PUBEK_RESULT_SIZE,
@@ -92,7 +92,7 @@ static ssize_t pcrs_show(struct device *dev, struct
device_attribute *attr,
ssize_t rc;
int i, j, num_pcrs;
char *str = buf;
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
rc = tpm_getcap(dev, TPM_CAP_PROP_PCR, &cap,
"attempting to determine the number of PCRS");
@@ -222,7 +222,7 @@ static DEVICE_ATTR_RO(caps);
static ssize_t cancel_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
- struct tpm_chip *chip = dev_get_drvdata(dev);
+ struct tpm_chip *chip = to_tpm_chip(dev);
if (chip == NULL)
return 0;
@@ -234,7 +234,7 @@ static DEVICE_ATTR_WO(cancel);
static ssize_t durations_show(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);
if (chip->duration[TPM_LONG] == 0)
return 0;
@@ -251,7 +251,7 @@ static DEVICE_ATTR_RO(durations);
static ssize_t timeouts_show(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 sprintf(buf, "%d %d %d %d [%s]\n",
jiffies_to_usecs(chip->timeout_a),
@@ -283,22 +283,33 @@ 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);
+ const struct attribute **i;
- if (err)
- dev_err(&chip->dev,
- "failed to create sysfs attributes, %d\n", err);
- return err;
+ chip->groups[chip->groups_cnt++] = &tpm_dev_group;
+ if (chip->flags & TPM_CHIP_FLAG_TPM2)
+ return 0;
+
+ for (i = tpm_dev_attrs; *i != NULL; ++i) {
+ rc = __compat_only_sysfs_link_entry_to_kobj(
+ &chip->dev.parent->kobj, &chip->dev.kobj, (*i)->name);
+ if (rc && rc != -ENOENT) {
+ tpm_sysfs_del_device(chip);
+ return rc;
+ }
+ }
+
+ return 0;
}
void tpm_sysfs_del_device(struct tpm_chip *chip)
{
- /* The sysfs routines rely on an implicit tpm_try_get_ops, this
- * function is called before ops is null'd and the sysfs core
- * synchronizes this removal so that no callbacks are running or can
- * run again
+ const struct attribute **i;
+
+ /* 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
*/
- sysfs_remove_group(&chip->dev.parent->kobj, &tpm_dev_group);
+
+ for (i = tpm_dev_attrs; *i != NULL; ++i)
+ sysfs_remove_link(&chip->dev.parent->kobj, (*i)->name);
}
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