linux-kernel - Re: [PATCH 1/3] ACPI: PRM: Add acpi_prm_handler

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Message-ID: <20251016160149.GBaPEW7ej4qvOcVfYh@fat_crate.local>
Date: Thu, 16 Oct 2025 18:01:49 +0200
From: Borislav Petkov <bp@...en8.de>
To: "Rafael J. Wysocki" <rafael@...nel.org>
Cc: Yazen Ghannam <yazen.ghannam@....com>, Len Brown <lenb@...nel.org>,
	Tony Luck <tony.luck@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org,
	Avadhut Naik <avadhut.naik@....com>,
	John Allen <john.allen@....com>,
	Mario Limonciello <mario.limonciello@....com>
Subject: Re: [PATCH 1/3] ACPI: PRM: Add acpi_prm_handler_available()

On Mon, Oct 06, 2025 at 03:10:25PM +0000, Yazen Ghannam wrote:
> Add a helper function to check if a PRM handler/module is present.
> 
> This can be used during init time by code that depends on a particular
> handler. If the handler is not present, then the code does not need to
> be loaded.
> 
> Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
> ---
>  drivers/acpi/prmt.c  | 6 ++++++
>  include/linux/prmt.h | 2 ++
>  2 files changed, 8 insertions(+)
> 
> diff --git a/drivers/acpi/prmt.c b/drivers/acpi/prmt.c
> index 6792d4385eee..7b8b5d2015ec 100644
> --- a/drivers/acpi/prmt.c
> +++ b/drivers/acpi/prmt.c
> @@ -244,6 +244,12 @@ static struct prm_handler_info *find_prm_handler(const guid_t *guid)
>  	return (struct prm_handler_info *) find_guid_info(guid, GET_HANDLER);
>  }
>  
> +bool acpi_prm_handler_available(const guid_t *guid)
> +{
> +	return find_prm_handler(guid) && find_prm_module(guid);
> +}
> +EXPORT_SYMBOL_GPL(acpi_prm_handler_available);
> +
>  /* In-coming PRM commands */
>  
>  #define PRM_CMD_RUN_SERVICE		0
> diff --git a/include/linux/prmt.h b/include/linux/prmt.h
> index c53ab287e932..8cdc987de963 100644
> --- a/include/linux/prmt.h
> +++ b/include/linux/prmt.h
> @@ -4,9 +4,11 @@
>  
>  #ifdef CONFIG_ACPI_PRMT
>  void init_prmt(void);
> +bool acpi_prm_handler_available(const guid_t *handler_guid);
>  int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer);
>  #else
>  static inline void init_prmt(void) { }
> +static inline bool acpi_prm_handler_available(const guid_t *handler_guid) { return false; }
>  static inline int acpi_call_prm_handler(guid_t handler_guid, void *param_buffer)
>  {
>  	return -EOPNOTSUPP;
> 
> -- 

Rafael?

-- 
Regards/Gruss,
    Boris.

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