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

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Message-ID: <c0fe8a7c2f2bd02e5bf240c78e0e320b99c0f2b7.camel@linux.intel.com>
Date:   Tue, 26 Jun 2018 11:22:31 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>
Cc:     "Usyskin, Alexander" <alexander.usyskin@...el.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...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 18:50 +0000, Winkler, Tomas 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.
> > 
> > Should be simple changes to do.
> 
> It simple to change, but first you've already agreed on NESTED, second I would
> appreciate some reasoning behind your requests.
> There is a logic behind this why RAW is hidden, it's because it always hast be
> coupled with UNLOCKED, and hence NESTED convers both, it gives cleaner API.

>From my side this is NAK.

/Jarkko