linux-kernel - Re: [GIT PULL] tpmdd updates for Linux v5.4

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Message-ID: <CAPcyv4jD8aod4=TSw+kfnS56rT_xqDSXYwXKoGzF=c3=1G3G-Q@mail.gmail.com>
Date:   Wed, 27 Nov 2019 13:10:00 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-integrity@...r.kernel.org, James Morris <jmorris@...ei.org>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        stable <stable@...r.kernel.org>
Subject: Re: [GIT PULL] tpmdd updates for Linux v5.4

On Wed, Nov 27, 2019 at 12:58 PM Jarkko Sakkinen
<jarkko.sakkinen@...ux.intel.com> wrote:
>
> On Wed, Nov 20, 2019 at 08:48:25PM -0800, Dan Williams wrote:
> > On Mon, Sep 2, 2019 at 7:34 AM Jarkko Sakkinen
> > <jarkko.sakkinen@...ux.intel.com> wrote:
> > >
> > > Hi
> > >
> > > A new driver for fTPM living inside ARM TEE was added this round. In
> > > addition to that, there is three bug fixes and one clean up.
> > >
> > > /Jarkko
> > >
> > > The following changes since commit 8fb8e9e46261e0117cb3cffb6dd8bb7e08f8649b:
> > >
> > >   Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma (2019-08-30 09:23:45 -0700)
> > >
> > > are available in the Git repository at:
> > >
> > >   git://git.infradead.org/users/jjs/linux-tpmdd.git tags/tpmdd-next-20190902
> > >
> > > for you to fetch changes up to e8bd417aab0c72bfb54465596b16085702ba0405:
> > >
> > >   tpm/tpm_ftpm_tee: Document fTPM TEE driver (2019-09-02 17:08:35 +0300)
> > >
> > > ----------------------------------------------------------------
> > > tpmdd updates for Linux v5.4
> > >
> > > ----------------------------------------------------------------
> > > Jarkko Sakkinen (1):
> > >       tpm: Remove a deprecated comments about implicit sysfs locking
> > >
> > > Lukas Bulwahn (1):
> > >       MAINTAINERS: fix style in KEYS-TRUSTED entry
> > >
> > > Sasha Levin (2):
> > >       tpm/tpm_ftpm_tee: A driver for firmware TPM running inside TEE
> > >       tpm/tpm_ftpm_tee: Document fTPM TEE driver
> > >
> > > Stefan Berger (2):
> > >       tpm_tis_core: Turn on the TPM before probing IRQ's
> > >       tpm_tis_core: Set TPM_CHIP_FLAG_IRQ before probing for interrupts
> >
> > Hi Jarrko,
> >
> > I'm replying here because I can't find the patches to reply to
> > directly from LKML.
> >
> > Commit 7f064c378e2c "tpm_tis_core: Turn on the TPM before probing
> > IRQ's" in the v5.3-stable tree caused a regression on a pre-release
> > platform with a TPM2 device. The interrupt starts screaming when the
> > driver is loaded and does not stop until the device is force unbond
> > from the driver by:
> >
> >      echo IFX0740:00 > /sys/bus/platform/drivers/tpm_tis/unbind
> >
> > I checked v5.4-rc8 and it has the same problem. I tried reverting:
> >
> > 1ea32c83c699 tpm_tis_core: Set TPM_CHIP_FLAG_IRQ before probing for interrupts
> > 5b359c7c4372 tpm_tis_core: Turn on the TPM before probing IRQ's
> >
> > Which silenced the screaming interrupt problem, but now the TPM is reporting:
> >
> > [    3.725131] tpm_tis IFX0740:00: 2.0 TPM (device-id 0x1B, rev-id 16)
> > [    3.725358] tpm tpm0: tpm_try_transmit: send(): error -5
> > [    3.725359] tpm tpm0: [Firmware Bug]: TPM interrupt not working,
> > polling instead
> >
> > ...at load, where it was not reporting this previously. Can you take a look?
>
> It is already in WiP:
>
> https://patchwork.kernel.org/patch/11240111/

That fix did not work for me.

>
> Stefan also sent patches that revert to changes that you described:
>
> https://patchwork.kernel.org/cover/11262363/
>
> Probably better first to fix the issue on top of master before deciding
> actions.

Revert and try again sounds good to me.