linux-kernel - Re: [PATCH] ACPI: thermal: extend the acpi maximum handles for

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Date:   Wed, 9 Aug 2023 12:09:16 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Ivan Hu <ivan.hu@...onical.com>
Cc:     robert.moore@...el.com, rafael.j.wysocki@...el.com,
        lenb@...nel.org, linux-acpi@...r.kernel.org,
        acpica-devel@...ts.linuxfoundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ACPI: thermal: extend the acpi maximum handles for _PSL method

On Wed, Aug 9, 2023 at 11:44 AM Ivan Hu <ivan.hu@...onical.com> wrote:
>
> Several platforms encountered the following kernel message:
> ACPI: \_TZ_.BATZ: Invalid passive threshold
>
> This issue arises due to the failure of the acpi_evaluate_reference function
> in drivers/acpi/thermal.c while evaluating the ACPI _PSL method.
>
> status = acpi_evaluate_reference(tz->device->handle, "_PSL",
>                          NULL, &devices);
> if (ACPI_FAILURE(status)) {
>         acpi_handle_info(tz->device->handle,
>                          "Invalid passive threshold\n");
>         tz->trips.passive.valid = false;
> } else {
>         tz->trips.passive.valid = true;
> }
>
> However, the root cause lies in the _PSL method returning packages with a count
> exceeding ACPI_MAX_HANDLES in acpi_evaluate_reference.
>
> As per the ACPI specification, the _PSL (Passive List) method is defined under
> a thermal zone and evaluates to a list of processor objects to be used for
> passive cooling. And it will return a variable-length Package containing a list
> of References to processor objects.
>
> Signed-off-by: Ivan Hu <ivan.hu@...onical.com>

Please check if this patch fixes the problem for you (it may need to
be rebased):

https://patchwork.kernel.org/project/linux-acpi/patch/20230330030446.2469338-1-vi@endrift.com/

> ---
>  include/acpi/acpi_bus.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 23fbe4a16972..dc7b38826113 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -13,7 +13,7 @@
>  #include <linux/property.h>
>
>  /* TBD: Make dynamic */
> -#define ACPI_MAX_HANDLES       10
> +#define ACPI_MAX_HANDLES       32
>  struct acpi_handle_list {
>         u32 count;
>         acpi_handle handles[ACPI_MAX_HANDLES];
> --
> 2.34.1
>