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

[Jerry Snitselaar]

On Wed Nov 20 19, Dan Williams wrote:
> On Mon, Sep 2, 2019 at 7:34 AM Jarkko Sakkinen
> <jarkko.sakkinen@xxxxxxxxxxxxxxx> 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?

We've had an issue reported for a Lenovo t490s getting an interrupt storm
with the Fedora 5.3 stable kernel, so it appears to be impacting a number of
systems.