Re: [tpmdd-devel] [PATCH v1 12/12] tpm: TPM2 sysfs attributes

From: Stefan Berger
Date: Wed Sep 24 2014 - 13:34:23 EST


On 09/24/2014 01:13 PM, Jason Gunthorpe wrote:
On Wed, Sep 24, 2014 at 12:06:02PM +0300, Jarkko Sakkinen wrote:
+static ssize_t durations_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct tpm_chip *chip = dev_get_drvdata(dev);
+
+ if (chip->vendor.duration[TPM_LONG] == 0)
+ return 0;
+
+ return sprintf(buf, "%d %d %d [%s]\n",
+ jiffies_to_usecs(chip->vendor.duration[TPM_SHORT]),
+ jiffies_to_usecs(chip->vendor.duration[TPM_MEDIUM]),
+ jiffies_to_usecs(chip->vendor.duration[TPM_LONG]),
+ chip->vendor.duration_adjusted
+ ? "adjusted" : "original");
+}
+static DEVICE_ATTR_RO(durations);
Seem useless since the durations are constant, drop it?

We show them for TPM 1.2 as well, so I'd keep them fo TPM2.


+static ssize_t timeouts_show(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");
+}
+static DEVICE_ATTR_RO(timeouts);

With all the problems we had with TPM 1.2 TPM's wrong timeouts and showing them in sysfs, why not show them for TPM2 as well?

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