diff mbox series

[v3,4/6] x86: Consolidate PCI_MMCONFIG configs

Message ID 8527c92b2e2920b8cd9096ddcbbb6d0f4004eb69.1519882849.git.jan.kiszka@siemens.com
State Not Applicable
Headers show
Series jailhouse: Enhance secondary Jailhouse guest support /wrt PCI | expand

Commit Message

Jan Kiszka March 1, 2018, 5:40 a.m. UTC 
From: Jan Kiszka <jan.kiszka@siemens.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.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
 arch/x86/Kconfig | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

Comments

Andy Shevchenko March 1, 2018, 10:31 a.m. UTC | #1 
On Thu, Mar 1, 2018 at 7:40 AM, Jan Kiszka <jan.kiszka@siemens.com> wrote:
> From: Jan Kiszka <jan.kiszka@siemens.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.
>

FWIW,
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>

> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.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
>
Bjorn Helgaas March 1, 2018, 3:13 p.m. UTC | #2 
On Thu, Mar 01, 2018 at 06:40:47AM +0100, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@siemens.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@siemens.com>

But either way,

Acked-by: Bjorn Helgaas <bhelgaas@google.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
>
Andy Shevchenko March 1, 2018, 4:35 p.m. UTC | #3 
On Thu, Mar 1, 2018 at 5:13 PM, Bjorn Helgaas <helgaas@kernel.org> wrote:
> On Thu, Mar 01, 2018 at 06:40:47AM +0100, Jan Kiszka wrote:
>> From: Jan Kiszka <jan.kiszka@siemens.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@siemens.com>
>
> But either way,
>
> Acked-by: Bjorn Helgaas <bhelgaas@google.com>
>

If you going to respin I would suggest one more trivia

Split long depends on to two lines, like
-      depends on PCI && (X86_64 || (PCI_GODIRECT || PCI_GOANY ||
PCI_GOOLPC || PCI_GOMMCONFIG))
+      depends on PCI
+      depends on X86_64 || (PCI_GODIRECT || PCI_GOANY || PCI_GOOLPC
|| PCI_GOMMCONFIG)

...

      depends on PCI && (ACPI || SFI) && (X86_64 || (PCI_GOANY ||
PCI_GOMMCONFIG))
+     depends on PCI && (ACPI || SFI)
+     depends on X86_64 || (PCI_GOANY || PCI_GOMMCONFIG)

(perhaps in a separate change)

>> ---
>>  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
>>
diff mbox series

Patch

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