linux-kernel - Re: [PATCH v7] tpm: separate cmd_ready/go_idle from runtime

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Date:   Mon, 25 Jun 2018 19:30:15 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     Tomas Winkler <tomas.winkler@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     Alexander Usyskin <alexander.usyskin@...el.com>,
        linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v7] tpm: separate cmd_ready/go_idle from runtime_pm

On Mon, 2018-06-25 at 19:24 +0300, Jarkko Sakkinen wrote:
> On Sun, 2018-06-24 at 23:52 +0300, Tomas Winkler wrote:
> > Fix tpm ptt initialization error:
> > tpm tpm0: A TPM error (378) occurred get tpm pcr allocation.
> > 
> > We cannot use go_idle cmd_ready commands via runtime_pm handles
> > as with the introduction of localities this is no longer an optional
> > feature, while runtime pm can be not enabled.
> > Though cmd_ready/go_idle provides a power saving, it's also a part of
> > TPM2 protocol and should be called explicitly.
> > This patch exposes cmd_read/go_idle via tpm class ops and removes
> > runtime pm support as it is not used by any driver.
> > 
> > A new tpm transmit flag is added TPM_TRANSMIT_NESTED, which implies
> > TPM_TRANSMIT_UNLOCKED and TPM_TRANSMIT_RAW. Both are needed to resolve
> > tpm spaces and locality request recursive calls to tpm_transmit().
> > 
> > New wrappers are added tpm_cmd_ready() and tpm_go_idle() to
> > streamline tpm_try_transmit code.
> > 
> > tpm_crb no longer needs own power saving functions and can drop using
> > tpm_pm_suspend/resume.
> > 
> > This patch cannot be really separated from the locality fix.
> > Fixes: 888d867df441 (tpm: cmd_ready command can be issued only after
> > granting
> > locality)
> > 
> > Cc: stable@...r.kernel.org
> > Fixes: 888d867df441 (tpm: cmd_ready command can be issued only after
> > granting
> > locality)
> > Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> 
> Please:
> 
> 1. Remove NESTED.
> 2. Where you need call RAW | UNLOCKED.
> 3. Do not add __ prefix.

Right now if I really put head into this I can understand the logic
but it is a complete mess. I will forgot the dependencies between
flags within few weeks. A fixed requirement (so that you know) is
that they must be independent.

/Jarkko