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

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Date:	Wed, 24 Sep 2014 13:34:11 -0400
From:	Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
CC:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH v1 12/12] tpm: TPM2 sysfs attributes

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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