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Date: Mon, 4 Jun 2018 22:56:28 +0300
From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: Tadeusz Struk <tadeusz.struk@intel.com>
Cc: jgg@ziepe.ca, linux-integrity@vger.kernel.org
Subject: Re: [PATCH] tpm: add support for nonblocking operation
Message-ID: <20180604195628.GE2691@linux.intel.com>
References: <152780934926.32219.7291994735609525171.stgit@tstruk-mobl1.jf.intel.com>
 <20180604195554.GD2691@linux.intel.com>
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On Mon, Jun 04, 2018 at 10:55:54PM +0300, Jarkko Sakkinen wrote:
> On Thu, May 31, 2018 at 04:29:09PM -0700, Tadeusz Struk wrote:
> > The TCG SAPI specification [1] defines a set of functions, which allows
> > applications to use the TPM device in either blocking or non-blocking fashion.
> > Each command defined by the specification has a corresponding
> > Tss2_Sys_<COMMAND>_Prepare() and Tss2_Sys_<COMMAND>_Complete() call, which
> > together with Tss2_Sys_ExecuteAsync() is designed to allow asynchronous
> > mode of operation. Currently the driver supports only blocking calls, which
> > doesn't allow asynchronous operation. This patch changes it and adds support
> > for nonblocking write and a new poll function to enable applications using
> > the API as designed by the spec.
> > The new functionality can be tested using standard TPM tools implemented
> > in [2], with modified TCTI from [3].
> 
> I would need some statistics before I have interest to take these
> changes in any form eg use case where this matters in the end.

And please CC linux-kernel and linux-security-module.

/Jarkko