linux-kernel - Re: [PATCH] tpm: consolidate the TPM startup code

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Message-ID: <20170620214622.lqt72f6fiqgno2rh@linux.intel.com>
Date:   Tue, 20 Jun 2017 23:46:22 +0200
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Jason Gunthorpe <jgunthorpe@...idianresearch.com>
Cc:     tpmdd-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org,
        Peter Huewe <peterhuewe@....de>,
        Marcel Selhorst <tpmdd@...horst.net>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm: consolidate the TPM startup code

On Tue, Jun 20, 2017 at 10:55:29PM +0200, Jarkko Sakkinen wrote:
> On Tue, Jun 20, 2017 at 01:31:52PM -0600, Jason Gunthorpe wrote:
> > On Tue, Jun 20, 2017 at 08:13:34PM +0200, Jarkko Sakkinen wrote:
> > > Consolidated all the "manual" TPM startup code to a single function
> > > in order to make code flows a bit cleaner and migrate to tpm_buf.
> > > 
> > > Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> > >  drivers/char/tpm/tpm-interface.c | 67 +++++++++++++++++++++++++---------------
> > >  drivers/char/tpm/tpm.h           |  6 +---
> > >  drivers/char/tpm/tpm2-cmd.c      | 32 +------------------
> > >  3 files changed, 44 insertions(+), 61 deletions(-)
> > 
> > Makes sense to me
> > 
> > > diff --git a/drivers/char/tpm/tpm-interface.c b/drivers/char/tpm/tpm-interface.c
> > > index d2b4df6d9894..fbef47d8bd06 100644
> > > +++ b/drivers/char/tpm/tpm-interface.c
> > > @@ -540,6 +540,47 @@ ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
> > >  }
> > >  EXPORT_SYMBOL_GPL(tpm_transmit_cmd);
> > >  
> > > +#define TPM_ORD_STARTUP 153
> > > +#define TPM_ST_CLEAR 1
> > 
> > We should really have a tpm1.h and tpm2.h that has all these various
> > constants and things instead of open coding them randomly all over..
> > 
> > Jason
> 
> I agree.

I agree means here that I agree if you mean only protocol specific
constants. I do not think it would make sense with things like struct
tpm_readpubek_out that is a throw away only used by that one function as
helper (would compare it to a helper function). It would only make
reading the code slower.

It would make sense, for example, to have enum tpm_ordinals for all
TPM 1.2 ordinals in tpm1_proto.h (yes would add _proto for clarity).

/Jarkko