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

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Date:   Mon, 25 Jun 2018 18:50:38 +0000
From:   "Winkler, Tomas" <tomas.winkler@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.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 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.

Thanks
Tomas