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

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Message-ID: <CAJZ5v0jyLZsbPY8bF5Ya6UojZrtk_fEhWaVH48wuUDw7TkjeWw@mail.gmail.com>
Date: Mon, 16 Dec 2024 21:46:51 +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 Mon, Dec 16, 2024 at 9:42 PM Ricardo Ribalda <ribalda@...omium.org> wrote:
>
> Hi Rafael
>
> On Mon, 16 Dec 2024 at 21:17, Rafael J. Wysocki <rafael@...nel.org> wrote:
> >
> > 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.
>
> Shall I redefine it to
> bool acpi_get_physical_device_location(acpi_handle handle, struct
> acpi_pld_info **pld)/
>
> For both the ACPI and !ACPI cases? or just for the !ACPI?

For both cases, please.