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

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Date:   Thu, 4 Mar 2021 09:06:22 -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>,
        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?

#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)
>