linux-kernel - Re: [PATCH v3 0/2] ftpm: a firmware based TPM driver

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Message-ID: <CAFA6WYP206hVoqkKcbEvLP9O7ZAOLLru3OZPbVDO95Me=euFnA@mail.gmail.com>
Date:   Wed, 8 May 2019 13:54:18 +0530
From:   Sumit Garg <sumit.garg@...aro.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Sasha Levin <sashal@...nel.org>, peterhuewe@....de,
        jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca, corbet@....net,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-doc@...r.kernel.org, linux-integrity@...r.kernel.org,
        linux-kernel@...rosoft.com, thiruan@...rosoft.com,
        bryankel@...rosoft.com, tee-dev@...ts.linaro.org
Subject: Re: [PATCH v3 0/2] ftpm: a firmware based TPM driver

On Wed, 8 May 2019 at 13:32, Daniel Thompson <daniel.thompson@...aro.org> wrote:
>
> On Wed, May 08, 2019 at 10:11:54AM +0530, Sumit Garg wrote:
> > + TEE ML
> >
> > Hi Sasha,
> >
> > Firstly apologies for my comments here as I recently joined
> > linux-integrity ML so I don't have other patches in my inbox. Also, it
> > would be nice if you could cc TEE ML in future patches, so that people
> > are aware of such interesting use-cases and may provide some feedback.
>
> If this kind is desire exists then shouldn't it be captured in
> MAINTAINERS?
>

Makes sense, will send a patch to capture it in MAINTAINERS file.

-Sumit

>
> Daniel.
>
> >
> > On Tue, 7 May 2019 at 23:10, Sasha Levin <sashal@...nel.org> wrote:
> > >
> > > On Mon, Apr 15, 2019 at 11:56:34AM -0400, Sasha Levin wrote:
> > > >From: "Sasha Levin (Microsoft)" <sashal@...nel.org>
> > > >
> > > >Changes since v2:
> > > >
> > > > - Drop the devicetree bindings patch (we don't add any new ones).
> > > > - More code cleanups based on Jason Gunthorpe's review.
> > > >
> > > >Sasha Levin (2):
> > > >  ftpm: firmware TPM running in TEE
> > > >  ftpm: add documentation for ftpm driver
> > >
> > > Ping? Does anyone have any objections to this?
> > >
> >
> > From [PATCH v3 1/2] ftpm: firmware TPM running in TEE:
> >
> > > +static const struct of_device_id of_ftpm_tee_ids[] = {
> > > + { .compatible = "microsoft,ftpm" },
> > > + { }
> > > +};
> > > +MODULE_DEVICE_TABLE(of, of_ftpm_tee_ids);
> > > +
> > > +static struct platform_driver ftpm_tee_driver = {
> > > + .driver = {
> > > + .name = DRIVER_NAME,
> > > + .of_match_table = of_match_ptr(of_ftpm_tee_ids),
> > > + },
> > > + .probe = ftpm_tee_probe,
> > > + .remove = ftpm_tee_remove,
> > > +};
> > > +
> > > +module_platform_driver(ftpm_tee_driver);
> >
> > Here this fTPM driver (seems to communicate with OP-TEE based TA)
> > should register on TEE bus [1] rather than platform bus as its actual
> > dependency is on TEE driver rather than using deferred probe to meet
> > its dependency. Have a look at OP-TEE based RNG driver here [2].
> >
> > [1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0fc1db9d105915021260eb241661b8e96f5c0f1a
> > [2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5fe8b1cc6a03c46b3061e808256d39dcebd0d0f0
> >
> > -Sumit
> >
> > > --
> > > Thanks,
> > > Sasha