linux-kernel - Re: [PATCH v3 4/6] tpm: TPM 2.0 sysfs attributes

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Date:	Sun, 19 Oct 2014 15:07:49 -0700
From:	Andy Lutomirski <luto@...capital.net>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	Peter Huewe <peterhuewe@....de>, Ashley Lai <ashley@...leylai.com>,
	Marcel Selhorst <tpmdd@...horst.net>,
	tpmdd-devel@...ts.sourceforge.net,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux API <linux-api@...r.kernel.org>, josh.triplett@...el.com,
	christophe.ricard@...il.com, will.c.arthur@...el.com,
	monty.wiseman@...el.com
Subject: Re: [PATCH v3 4/6] tpm: TPM 2.0 sysfs attributes

On Wed, Oct 15, 2014 at 4:35 AM, Jarkko Sakkinen
<jarkko.sakkinen@...ux.intel.com> wrote:
> Implemented sysfs attributes for TPM2 devices. TPM2 sysfs attributes
> are mounted in the actual device associated with the chip instead of
> platform device like with TPM1 devices.
>
> Documentation/ABI/stable/sysfs-class/tpm2 contains descriptions
> of these attributes.
>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>


> +What:          /sys/class/misc/tpmX/device/cancel
> +Date:          October 2014
> +KernelVersion: 3.19
> +Contact:       tpmdd-devel@...ts.sf.net
> +Description:   The "cancel" property allows you to cancel the currently
> +               pending TPM command. Writing any value to cancel will call the
> +               TPM chip specific cancel operation.

This is weird.  From the POV of a sysfs user, what operation gets
canceled?  What if it's a kernel-internal operation?

Shouldn't this be an ioctl?

--Andy
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