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Message-ID: <enaeow6numvzp74rrwpdqhjqs635ofqttj7o7gdoqfrsgbhihi@eb7ueum3r5w5>
Date: Mon, 14 Aug 2023 16:13:53 -0700
From: Jerry Snitselaar <jsnitsel@...hat.com>
To: Jarkko Sakkinen <jarkko@...nel.org>
Cc: linux-integrity@...r.kernel.org, Jonathan Corbet <corbet@....net>,
Peter Huewe <peterhuewe@....de>,
Jason Gunthorpe <jgg@...pe.ca>,
Richard Cochran <richardcochran@...il.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Randy Dunlap <rdunlap@...radead.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
"Steven Rostedt (Google)" <rostedt@...dmis.org>,
Daniel Sneddon <daniel.sneddon@...ux.intel.com>,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org
Subject: Re: [PATCH] tpm_tis: Revert "tpm_tis: Disable interrupts on ThinkPad
T490s"
On Mon, Aug 14, 2023 at 07:40:53PM +0300, Jarkko Sakkinen wrote:
> Since for MMIO driver using FIFO registers, also known as tpm_tis, the
> default (and tbh recommended) behaviour is now the polling mode, the
> "tristate" workaround is no longer for benefit.
>
> If someone wants to explicitly enable IRQs for a TPM chip that should be
> without question allowed. It could very well be a piece hardware in the
> existing deny list because of e.g. firmware update or something similar.
>
> While at it, document the module parameter, as this was not done in 2006
> when it first appeared in the mainline.
>
> Link: https://lore.kernel.org/linux-integrity/20201015214430.17937-1-jsnitsel@redhat.com/
> Link: https://lore.kernel.org/all/1145393776.4829.19.camel@localhost.localdomain/
> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
I was just typing an email to say that it looks like 6aaf663ee04a ("tpm_tis: Opt-in interrupts") will require
updating tpm_tis_disable_irq(), but you are already dealing with it. :)
Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>
> ---
> .../admin-guide/kernel-parameters.txt | 7 ++
> drivers/char/tpm/tpm_tis.c | 93 +------------------
> 2 files changed, 9 insertions(+), 91 deletions(-)
>
> diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
> index 722b6eca2e93..6354aa779178 100644
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -6340,6 +6340,13 @@
> This will guarantee that all the other pcrs
> are saved.
>
> + tpm_tis.interrupts= [HW,TPM]
> + Enable interrupts for the MMIO based physical layer
> + for the FIFO interface. By default it is set to false
> + (0). For more information about TPM hardware interfaces
> + defined by Trusted Computing Group (TCG) look up to
> + https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
> +
> tp_printk [FTRACE]
> Have the tracepoints sent to printk as well as the
> tracing ring buffer. This is useful for early boot up
> diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c
> index 7fa3d91042b2..077fdb73740c 100644
> --- a/drivers/char/tpm/tpm_tis.c
> +++ b/drivers/char/tpm/tpm_tis.c
> @@ -27,7 +27,6 @@
> #include <linux/of.h>
> #include <linux/of_device.h>
> #include <linux/kernel.h>
> -#include <linux/dmi.h>
> #include "tpm.h"
> #include "tpm_tis_core.h"
>
> @@ -89,8 +88,8 @@ static inline void tpm_tis_iowrite32(u32 b, void __iomem *iobase, u32 addr)
> tpm_tis_flush(iobase);
> }
>
> -static int interrupts;
> -module_param(interrupts, int, 0444);
> +static bool interrupts;
> +module_param(interrupts, bool, 0444);
> MODULE_PARM_DESC(interrupts, "Enable interrupts");
>
> static bool itpm;
> @@ -103,92 +102,6 @@ module_param(force, bool, 0444);
> MODULE_PARM_DESC(force, "Force device probe rather than using ACPI entry");
> #endif
>
> -static int tpm_tis_disable_irq(const struct dmi_system_id *d)
> -{
> - if (interrupts == -1) {
> - pr_notice("tpm_tis: %s detected: disabling interrupts.\n", d->ident);
> - interrupts = 0;
> - }
> -
> - return 0;
> -}
> -
> -static const struct dmi_system_id tpm_tis_dmi_table[] = {
> - {
> - .callback = tpm_tis_disable_irq,
> - .ident = "Framework Laptop (12th Gen Intel Core)",
> - .matches = {
> - DMI_MATCH(DMI_SYS_VENDOR, "Framework"),
> - DMI_MATCH(DMI_PRODUCT_NAME, "Laptop (12th Gen Intel Core)"),
> - },
> - },
> - {
> - .callback = tpm_tis_disable_irq,
> - .ident = "Framework Laptop (13th Gen Intel Core)",
> - .matches = {
> - DMI_MATCH(DMI_SYS_VENDOR, "Framework"),
> - DMI_MATCH(DMI_PRODUCT_NAME, "Laptop (13th Gen Intel Core)"),
> - },
> - },
> - {
> - .callback = tpm_tis_disable_irq,
> - .ident = "ThinkPad T490s",
> - .matches = {
> - DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> - DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad T490s"),
> - },
> - },
> - {
> - .callback = tpm_tis_disable_irq,
> - .ident = "ThinkStation P360 Tiny",
> - .matches = {
> - DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> - DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkStation P360 Tiny"),
> - },
> - },
> - {
> - .callback = tpm_tis_disable_irq,
> - .ident = "ThinkPad L490",
> - .matches = {
> - DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> - DMI_MATCH(DMI_PRODUCT_VERSION, "ThinkPad L490"),
> - },
> - },
> - {
> - .callback = tpm_tis_disable_irq,
> - .ident = "ThinkPad L590",
> - .matches = {
> - DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"),
> - 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 = "TUXEDO InfinityBook S 15/17 Gen7",
> - .matches = {
> - DMI_MATCH(DMI_SYS_VENDOR, "TUXEDO"),
> - DMI_MATCH(DMI_PRODUCT_NAME, "TUXEDO InfinityBook S 15/17 Gen7"),
> - },
> - },
> - {
> - .callback = tpm_tis_disable_irq,
> - .ident = "UPX-TGL",
> - .matches = {
> - DMI_MATCH(DMI_SYS_VENDOR, "AAEON"),
> - DMI_MATCH(DMI_PRODUCT_NAME, "UPX-TGL01"),
> - },
> - },
> - {}
> -};
> -
> #if defined(CONFIG_PNP) && defined(CONFIG_ACPI)
> static int has_hid(struct acpi_device *dev, const char *hid)
> {
> @@ -312,8 +225,6 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info)
> int irq = -1;
> int rc;
>
> - dmi_check_system(tpm_tis_dmi_table);
> -
> rc = check_acpi_tpm2(dev);
> if (rc)
> return rc;
> --
> 2.39.2
>
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