tpm_tis: Introduce durations sysfs entry
Display the TPM's command timeouts in a 'durations' 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> Tested-by: Guillaume Chazarain <guichaz@gmail.com> Signed-off-by: Rajiv Andrade <srajiv@linux.vnet.ibm.com>
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@ -597,6 +597,7 @@ duration:
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chip->vendor.duration[TPM_SHORT] = HZ;
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chip->vendor.duration[TPM_MEDIUM] *= 1000;
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chip->vendor.duration[TPM_LONG] *= 1000;
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chip->vendor.duration_adjusted = true;
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dev_info(chip->dev, "Adjusting TPM timeout parameters.");
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}
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}
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@ -944,6 +945,20 @@ ssize_t tpm_show_caps_1_2(struct device * dev,
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}
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EXPORT_SYMBOL_GPL(tpm_show_caps_1_2);
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ssize_t tpm_show_durations(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct tpm_chip *chip = dev_get_drvdata(dev);
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return sprintf(buf, "%d %d %d [%s]\n",
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jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
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jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
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jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
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chip->vendor.duration_adjusted
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? "adjusted" : "original");
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}
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EXPORT_SYMBOL_GPL(tpm_show_durations);
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ssize_t tpm_store_cancel(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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@ -56,6 +56,8 @@ extern ssize_t tpm_show_owned(struct device *, struct device_attribute *attr,
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char *);
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extern ssize_t tpm_show_temp_deactivated(struct device *,
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struct device_attribute *attr, char *);
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extern ssize_t tpm_show_durations(struct device *,
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struct device_attribute *attr, char *);
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struct tpm_chip;
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@ -82,6 +84,7 @@ struct tpm_vendor_specific {
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int locality;
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unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
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unsigned long duration[3]; /* jiffies */
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bool duration_adjusted;
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wait_queue_head_t read_queue;
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wait_queue_head_t int_queue;
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@ -376,6 +376,7 @@ static DEVICE_ATTR(temp_deactivated, S_IRUGO, tpm_show_temp_deactivated,
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NULL);
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static DEVICE_ATTR(caps, S_IRUGO, tpm_show_caps_1_2, NULL);
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static DEVICE_ATTR(cancel, S_IWUSR | S_IWGRP, NULL, tpm_store_cancel);
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static DEVICE_ATTR(durations, S_IRUGO, tpm_show_durations, NULL);
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static struct attribute *tis_attrs[] = {
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&dev_attr_pubek.attr,
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@ -385,7 +386,8 @@ static struct attribute *tis_attrs[] = {
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&dev_attr_owned.attr,
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&dev_attr_temp_deactivated.attr,
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&dev_attr_caps.attr,
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&dev_attr_cancel.attr, NULL,
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&dev_attr_cancel.attr,
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&dev_attr_durations.attr, NULL,
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};
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static struct attribute_group tis_attr_grp = {
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