linux-kernel - Re: [PATCH v3 4/6] x86: Consolidate PCI

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Date:   Thu, 1 Mar 2018 09:13:59 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jan Kiszka <jan.kiszka@...mens.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, x86@...nel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jailhouse-dev@...glegroups.com, linux-pci@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v3 4/6] x86: Consolidate PCI_MMCONFIG configs

On Thu, Mar 01, 2018 at 06:40:47AM +0100, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@...mens.com>
> 
> Since e279b6c1d329 ("x86: start unification of arch/x86/Kconfig.*"), we
> have two PCI_MMCONFIG entries, one from the original i386 and another
> from x86_64. This consolidates both entries into a single one.
> 
> The logic for x86_32, where this option was not under user control,
> remains identical. On x86_64, PCI_MMCONFIG becomes additionally
> configurable for SFI systems even if ACPI was disabled. This just
> simplifies the logic without restricting the configurability in any way.

Thanks for mentioning this difference.  It's probably trivial, but if
you have any other reason to respin this series, I would split this
into two patches:

  - allow PCI_MMCONFIG on x86_64 with SFI
  - consolidate PCI_MMCONFIG with no logical change at all

> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>

But either way,

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

> ---
>  arch/x86/Kconfig | 9 +++------
>  1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index eb7f43f23521..aef9d67ac186 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -2641,8 +2641,9 @@ config PCI_DIRECT
>  	depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC || PCI_GOMMCONFIG))
>  
>  config PCI_MMCONFIG
> -	def_bool y
> -	depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
> +	bool "Support mmconfig PCI config space access" if X86_64
> +	default y
> +	depends on PCI && (ACPI || SFI) && (X86_64 || (PCI_GOANY || PCI_GOMMCONFIG))
>  
>  config PCI_OLPC
>  	def_bool y
> @@ -2657,10 +2658,6 @@ config PCI_DOMAINS
>  	def_bool y
>  	depends on PCI
>  
> -config PCI_MMCONFIG
> -	bool "Support mmconfig PCI config space access"
> -	depends on X86_64 && PCI && ACPI
> -
>  config PCI_CNB20LE_QUIRK
>  	bool "Read CNB20LE Host Bridge Windows" if EXPERT
>  	depends on PCI
> -- 
> 2.13.6
>