linux-kernel - Re: [PATCH v4 2/6] ACPI: bus: implement acpi_get_physical_device

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Message-ID: <CAJZ5v0gmN6+y2DveaBjSqWpTRWqm9zo2t0uDdvGwnVXcdQ777A@mail.gmail.com>
Date: Mon, 16 Dec 2024 21:17:28 +0100
From: "Rafael J. Wysocki" <rafael@...nel.org>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: "Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>, 
	Robert Moore <robert.moore@...el.com>, "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>, 
	Sakari Ailus <sakari.ailus@...ux.intel.com>, Dan Carpenter <dan.carpenter@...aro.org>, 
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org, 
	acpica-devel@...ts.linux.dev, 
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Subject: Re: [PATCH v4 2/6] ACPI: bus: implement acpi_get_physical_device_location
 when !ACPI

On Wed, Dec 11, 2024 at 5:07 PM Ricardo Ribalda <ribalda@...omium.org> wrote:
>
> Provide an implementation of acpi_get_physical_device_location that can
> be used when CONFIG_ACPI is not set.
>
> Reviewed-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Acked-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  include/acpi/acpi_bus.h | 12 +++++++++---
>  1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
> index 2b09e513ecf3..b312a72f48ad 100644
> --- a/include/acpi/acpi_bus.h
> +++ b/include/acpi/acpi_bus.h
> @@ -43,9 +43,6 @@ acpi_status
>  acpi_evaluate_ost(acpi_handle handle, u32 source_event, u32 status_code,
>                   struct acpi_buffer *status_buf);
>
> -acpi_status
> -acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
> -
>  bool acpi_has_method(acpi_handle handle, char *name);
>  acpi_status acpi_execute_simple_method(acpi_handle handle, char *method,
>                                        u64 arg);
> @@ -60,6 +57,9 @@ bool acpi_check_dsm(acpi_handle handle, const guid_t *guid, u64 rev, u64 funcs);
>  union acpi_object *acpi_evaluate_dsm(acpi_handle handle, const guid_t *guid,
>                         u64 rev, u64 func, union acpi_object *argv4);
>  #ifdef CONFIG_ACPI
> +acpi_status
> +acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld);
> +
>  static inline union acpi_object *
>  acpi_evaluate_dsm_typed(acpi_handle handle, const guid_t *guid, u64 rev,
>                         u64 func, union acpi_object *argv4,
> @@ -1003,6 +1003,12 @@ static inline int unregister_acpi_bus_type(void *bus) { return 0; }
>
>  static inline int acpi_wait_for_acpi_ipmi(void) { return 0; }
>
> +static inline acpi_status
> +acpi_get_physical_device_location(acpi_handle handle, struct acpi_pld_info **pld)
> +{
> +       return AE_ERROR;
> +}

I overlooked this before, sorry.

It generally is not OK to use acpi_status and/or AE_ error codes
without CONFIG_ACPI and they really only should be used in
drivers/acpi/ (and not everywhere in there for that matter).

So acpi_get_physical_device_location() needs to be redefined to return
something different from acpi_status (preferably bool) in order to be
used in !CONFIG_ACPI code.

> +
>  #define for_each_acpi_dev_match(adev, hid, uid, hrv)                   \
>         for (adev = NULL; false && (hid) && (uid) && (hrv); )
>
>
> --