linux-kernel - Re: [PATCH] Enable ACPI_ADR_SPACE_PCI_CONFIG in acpi_gbl_default_address_spaces only when ACPI_PCI

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Message-ID: <CADFYyO5B2Mf50+gu6Dr7W3y9hGh9P2wOjyiYqJwLKcX_2pX8QA@mail.gmail.com>
Date:   Fri, 5 Mar 2021 12:55:26 -0800
From:   Weidong Cui <weidongcui@...il.com>
To:     "Moore, Robert" <robert.moore@...el.com>
Cc:     "Kaneda, Erik" <erik.kaneda@...el.com>,
        "Wysocki, Rafael J" <rafael.j.wysocki@...el.com>,
        Xinyang Ge <aegiryy@...il.com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "devel@...ica.org" <devel@...ica.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Enable ACPI_ADR_SPACE_PCI_CONFIG in acpi_gbl_default_address_spaces
 only when ACPI_PCI_CONFIGURED is defined

On Fri, Mar 5, 2021 at 12:46 PM Moore, Robert <robert.moore@...el.com> wrote:
>
> After giving this some thought, I think we can #define ACPI_PCI_CONFIGURED in the global configuration file (I think it is acconfig.h) - and document why and when it should be removed.
> Bob

Hi Bob,

Thank you very much for your new suggestion!  Let me make sure I understand it.

1. We should move the following define from aclinux.h to acconfig.h.

#ifdef CONFIG_PCI
#define ACPI_PCI_CONFIGURED
#endif

2. We should add a comment there to "document why and when it should
be removed".
I don't really know "why and when" since I'm not an expert on ACPI (we
were just trying
to fix a bug :-)).

Thanks!
Weidong

> -----Original Message-----
> From: Moore, Robert <robert.moore@...el.com>
> Sent: Thursday, March 04, 2021 9:37 AM
> To: weidongcui@...il.com
> Cc: Kaneda, Erik <erik.kaneda@...el.com>; Wysocki, Rafael J <rafael.j.wysocki@...el.com>; Xinyang Ge <aegiryy@...il.com>; linux-acpi@...r.kernel.org; devel@...ica.org; linux-kernel@...r.kernel.org
> Subject: [Devel] Re: [PATCH] Enable ACPI_ADR_SPACE_PCI_CONFIG in acpi_gbl_default_address_spaces only when ACPI_PCI_CONFIGURED is defined
>
>
>
> -----Original Message-----
> From: Weidong Cui <weidongcui@...il.com>
> Sent: Thursday, March 04, 2021 9:06 AM
> To: Moore, Robert <robert.moore@...el.com>
> Cc: Kaneda, Erik <erik.kaneda@...el.com>; Wysocki, Rafael J <rafael.j.wysocki@...el.com>; Xinyang Ge <aegiryy@...il.com>; linux-acpi@...r.kernel.org; devel@...ica.org; linux-kernel@...r.kernel.org; Len Brown <lenb@...nel.org>
> Subject: Re: [PATCH] Enable ACPI_ADR_SPACE_PCI_CONFIG in acpi_gbl_default_address_spaces only when ACPI_PCI_CONFIGURED is defined
>
> > Well, I don't like the fact that PCI_CONFIGURED would have to be defined by each current host:
> >
> > > +#ifdef ACPI_PCI_CONFIGURED
> >
> > I would rather the logic be reversed:
> >
> > > +#ifdef ACPI_PCI_NOT_CONFIGURED
>
> Thank you for the comments, Erik and Bob!
>
> ACPI_PCI_CONFIGURED is defined in aclinux.h (see below) and used in several places in evhandler.c and exregion.c.
> I'm not sure why we want to introduce ACPI_PCI_NOT_CONFIGURED.  Bob, I don't understand your concerns about "have to be defined by each current host".  Can you please shed some light on it?
>
> It is required in aclinux.h, and thus it is required in every host-dependent configuration file (acfreebsd.h, acmacosx.h, acnetbsd.h, achaiku.h, etc.) I would rather not force these host-specific header files to change.
> Bob
>
>
> #ifdef CONFIG_PCI
> #define ACPI_PCI_CONFIGURED
> #endif
>
> > -----Original Message-----
> > From: Kaneda, Erik <erik.kaneda@...el.com>
> > Sent: Wednesday, March 03, 2021 10:29 AM
> > To: Weidong Cui <weidongcui@...il.com>; Moore, Robert
> > <robert.moore@...el.com>; Wysocki, Rafael J
> > <rafael.j.wysocki@...el.com>
> > Cc: Xinyang Ge <aegiryy@...il.com>; linux-acpi@...r.kernel.org;
> > devel@...ica.org; linux-kernel@...r.kernel.org; Len Brown
> > <lenb@...nel.org>
> > Subject: RE: [PATCH] Enable ACPI_ADR_SPACE_PCI_CONFIG in
> > acpi_gbl_default_address_spaces only when ACPI_PCI_CONFIGURED is
> > defined
> >
> > This looks good to me. Bob, do you have any comments?
> >
> > Erik
> >
> > > -----Original Message-----
> > > From: Weidong Cui <weidongcui@...il.com>
> > > Sent: Monday, February 8, 2021 7:18 PM
> > > To: Moore, Robert <robert.moore@...el.com>; Kaneda, Erik
> > > <erik.kaneda@...el.com>; Wysocki, Rafael J
> > > <rafael.j.wysocki@...el.com>; Len Brown <lenb@...nel.org>
> > > Cc: Weidong Cui <weidongcui@...il.com>; Xinyang Ge
> > > <aegiryy@...il.com>; linux-acpi@...r.kernel.org; devel@...ica.org;
> > > linux- kernel@...r.kernel.org
> > > Subject: [PATCH] Enable ACPI_ADR_SPACE_PCI_CONFIG in
> > > acpi_gbl_default_address_spaces only when ACPI_PCI_CONFIGURED is
> > > defined
> > >
> > > Signed-off-by: Weidong Cui <weidongcui@...il.com>
> > > Signed-off-by: Xinyang Ge <aegiryy@...il.com>
> > > ---
> > >  drivers/acpi/acpica/evhandler.c | 2 ++
> > >  include/acpi/acconfig.h         | 4 ++++
> > >  2 files changed, 6 insertions(+)
> > >
> > > diff --git a/drivers/acpi/acpica/evhandler.c
> > > b/drivers/acpi/acpica/evhandler.c index 5884eba04..4c25ad433 100644
> > > --- a/drivers/acpi/acpica/evhandler.c
> > > +++ b/drivers/acpi/acpica/evhandler.c
> > > @@ -26,7 +26,9 @@ acpi_ev_install_handler(acpi_handle obj_handle,
> > >  u8 acpi_gbl_default_address_spaces[ACPI_NUM_DEFAULT_SPACES] = {
> > >       ACPI_ADR_SPACE_SYSTEM_MEMORY,
> > >       ACPI_ADR_SPACE_SYSTEM_IO,
> > > +#ifdef ACPI_PCI_CONFIGURED
> > >       ACPI_ADR_SPACE_PCI_CONFIG,
> > > +#endif
> > >       ACPI_ADR_SPACE_DATA_TABLE
> > >  };
> > >
> > > diff --git a/include/acpi/acconfig.h b/include/acpi/acconfig.h index
> > > a225eff49..790999028 100644
> > > --- a/include/acpi/acconfig.h
> > > +++ b/include/acpi/acconfig.h
> > > @@ -162,7 +162,11 @@
> > >  /* Maximum space_ids for Operation Regions */
> > >
> > >  #define ACPI_MAX_ADDRESS_SPACE          255
> > > +#ifdef ACPI_PCI_CONFIGURED
> > >  #define ACPI_NUM_DEFAULT_SPACES         4
> > > +#else
> > > +#define ACPI_NUM_DEFAULT_SPACES         3
> > > +#endif
> > >
> > >  /* Array sizes.  Used for range checking also */
> > >
> > > --
> > > 2.24.3 (Apple Git-128)
> >
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