linux-kernel - Re: [PATCH] tpm/tpm_tis: Disable interrupts for Lenovo P620 devices

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Date:   Sat, 05 Aug 2023 02:08:15 +0300
From:   "Jarkko Sakkinen" <jarkko@...nel.org>
To:     "Jonathan McDowell" <noodles@...a.com>,
        "Peter Huewe" <peterhuewe@....de>
Cc:     "Jason Gunthorpe" <jgg@...pe.ca>,
        "Lino Sanfilippo" <l.sanfilippo@...bus.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tpm/tpm_tis: Disable interrupts for Lenovo P620 devices

On Fri Aug 4, 2023 at 8:08 PM EEST, Jonathan McDowell wrote:
> The Lenovo ThinkStation P620 suffers from an irq storm issue like
> various other Lenovo machines, so add an entry for it to
> tpm_tis_dmi_table and force polling.
>
> It is worth noting that 481c2d14627de8ecbb54dd125466e4b4a5069b47
> (tpm,tpm_tis: Disable interrupts after 1000 unhandled IRQs) does not
> seem to fix the problem on this machine, but setting
> tpm_tis.interrupts=0 on the kernel command line does.
>
> Cc: stable@...r.kernel.org # v6.4+
> Fixes: e644b2f498d2 ("tpm, tpm_tis: Enable interrupt test")
> Signed-off-by: Jonathan McDowell <noodles@...a.com>
> ---
>  drivers/char/tpm/tpm_tis.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index cc42cf3de960..0cbd745374dc 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -162,6 +162,14 @@ static const struct dmi_system_id tpm_tis_dmi_table[] = {
>  			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad L590"),
>  		},
>  	},
> +	{
> +		.callback = tpm_tis_disable_irq,
> +		.ident = "ThinkStation P620",
> +		.matches = {
> +			DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> +			DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkStation P620"),
> +		},
> +	},
>  	{
>  		.callback = tpm_tis_disable_irq,
>  		.ident = "UPX-TGL",

Reviewed-by: Jarkko Sakkinen <jarkko@...nel.org>

BR, Jarkko