tpm_tis: Add timeouts sysfs entry

Display the TPM's interface timeouts in a 'timeouts' sysfs entry. Display
the entries as having been adjusted when they were scaled due to their values
being reported in milliseconds rather than microseconds.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>

3 files changed, 22 insertions, 1 deletions

diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c
index 533ae359cb28..873ef50aad90 100644
--- a/drivers/char/tpm/tpm.c
+++ b/drivers/char/tpm/tpm.c
@@ -557,6 +557,7 @@ void tpm_get_timeouts(struct tpm_chip *chip)
         if (timeout && timeout < 1000) {
                 /* timeouts in msec rather usec */
                 scale = 1000;
+                chip->vendor.timeout_adjusted = true;
         }
         if (timeout)
                 chip->vendor.timeout_a = usecs_to_jiffies(timeout * scale);
@@ -965,6 +966,21 @@ ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
 }
 EXPORT_SYMBOL_GPL(tpm_show_durations);
 
+ssize_t tpm_show_timeouts(struct device *dev, struct device_attribute *attr,
+                          char *buf)
+{
+        struct tpm_chip *chip = dev_get_drvdata(dev);
+
+        return sprintf(buf, "%d %d %d %d [%s]\n",
+                       jiffies_to_usecs(chip->vendor.timeout_a),
+                       jiffies_to_usecs(chip->vendor.timeout_b),
+                       jiffies_to_usecs(chip->vendor.timeout_c),
+                       jiffies_to_usecs(chip->vendor.timeout_d),
+                       chip->vendor.timeout_adjusted
+                       ? "adjusted" : "original");
+}
+EXPORT_SYMBOL_GPL(tpm_show_timeouts);
+
 ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
                         const char *buf, size_t count)
 {
diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h
index 6fc797611ccb..c5e01c556233 100644
--- a/drivers/char/tpm/tpm.h
+++ b/drivers/char/tpm/tpm.h
@@ -58,6 +58,8 @@ extern ssize_t tpm_show_temp_deactivated(struct device *,
                                          struct device_attribute *attr, char *);
 extern ssize_t tpm_show_durations(struct device *,
                                   struct device_attribute *attr, char *);
+extern ssize_t tpm_show_timeouts(struct device *,
+                                 struct device_attribute *attr, char *);
 
 struct tpm_chip;
 
@@ -83,6 +85,7 @@ struct tpm_vendor_specific {
         struct list_head list;
         int locality;
         unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
+        bool timeout_adjusted;
         unsigned long duration[3]; /* jiffies */
         bool duration_adjusted;
 
diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
index e15b30d49543..a84108cd932f 100644
--- a/drivers/char/tpm/tpm_tis.c
+++ b/drivers/char/tpm/tpm_tis.c
@@ -377,6 +377,7 @@ static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
 static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
 static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
 static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
+static DEVICE_ATTR(timeouts, S_IRUGO, tpm_show_timeouts, NULL);
 
 static struct attribute *tis_attrs[] = {
         &dev_attr_pubek.attr,
@@ -387,7 +388,8 @@ static struct attribute *tis_attrs[] = {
         &dev_attr_temp_deactivated.attr,
         &dev_attr_caps.attr,
         &dev_attr_cancel.attr,
-        &dev_attr_durations.attr, NULL,
+        &dev_attr_durations.attr,
+        &dev_attr_timeouts.attr, NULL,
 };
 
 static struct attribute_group tis_attr_grp = {