linux-kernel - Re: [PATCH - for 6.4] tpm: tpm_tis: Disable interrupts for AEON UPX-i11

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Date:   Wed, 17 May 2023 16:15:18 +0300
From:   Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To:     peterhuewe@....de, jarkko@...nel.org
Cc:     jgg@...pe.ca, linux-integrity@...r.kernel.org,
        linux-kernel@...r.kernel.org, l.sanfilippo@...bus.com,
        jsnitsel@...hat.com
Subject: Re: [PATCH - for 6.4] tpm: tpm_tis: Disable interrupts for AEON
 UPX-i11



On 17/05/2023 15:29, Peter Ujfalusi wrote:
> The interrupts initially works on the device but they will stop arriving
> after about 200 interrupts.
> 
> On system reboot/shutdown this will cause a long wait (120000 jiffies).
> 
> The interrupts on this device got enabled by commit
> e644b2f498d2 ("tpm, tpm_tis: Enable interrupt test")
> 
> Prior to this point the interrupts were not enabled on this machine.
> 
> Complements: e644b2f498d2 ("tpm, tpm_tis: Enable interrupt test")
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>
> ---
> Hi,
> 
> This patch applies on top of mainline since 6.4-rc1 takes about 2 minutes to
> reboot on this machine, linux-next have
> e7d3e5c4b1dd tpm/tpm_tis: Disable interrupts for more Lenovo devices
> 
> I'm not sure if I shouold send this on top of next or mainline is fine, please
> let me know the preferred way to get this to 6.4.

In 6.3 the kernel prints this on boot:
# dmesg -w | grep tpm
tpm_tis MSFT0101:00: 2.0 TPM (device-id 0x1B, rev-id 22)
tpm tpm0: [Firmware Bug]: TPM interrupt not working, polling instead

It is interesting that with 6.4 most of the times the interrupts got
enabled (without this patch) resulting stall during reboot/shutdown but
there are few boots when the driver falls back to polling and thus the
TPM driver works.

The command which 'locks' the system is TPM2_CC_SHUTDOWN, it is given
TPM_UNDEFINED as duration index by tpm2_ordinal_duration_index().

> 
> Regards,
> Peter
> 
>  drivers/char/tpm/tpm_tis.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index 7af389806643..aad682c2ab21 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -122,6 +122,13 @@ static const struct dmi_system_id tpm_tis_dmi_table[] = {
>  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T490s"),
>  		},
>  	},
> +	{
> +		.callback = tpm_tis_disable_irq,
> +		.ident = "UPX-TGL",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "AAEON"),
> +		},
> +	},
>  	{}
>  };
>  

-- 
Péter