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

[Jerry Snitselaar <jsnitsel@redhat.com>]

On Fri Nov 29 19, Jarkko Sakkinen wrote:
>On Fri, Nov 22, 2019 at 09:18:36AM -0700, Jerry Snitselaar wrote:
>> On Wed Nov 20 19, Dan Williams wrote:
>> > On Mon, Sep 2, 2019 at 7:34 AM Jarkko Sakkinen
>> > <jarkko.sakkinen@linux.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?
>> >
>>
>> 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.
>
>Hi sorry for inactivity. I've had a renovation going on where I live
>which has caused some crackling in the comms but I'm catching up during
>the weekend.
>
>Which CPU model does T490S have? Can you paste /proc/cpuinfo?
>
>/Jarkko
>

I still don't have access to one of the laptops, but looking online
they should have one of the following: i5-8265U, i5-8365U, i7-8565U,
or i7-8665U. The tpm is discrete, so I don't know that the cpu will
matter. Looking at a log, in the t490s case it is an STMicroelectronics
chip. So both Infineon and STM so far.