linux-kernel - Re: [PATCH 2.6.21-rc5 1/3] msi: introduce ARCH_SUPPORTS

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Date:	Wed, 18 Apr 2007 18:46:20 +1000
From:	Michael Ellerman <michael@...erman.id.au>
To:	Greg KH <greg@...ah.com>
Cc:	linux@....linux.org.uk, linux-pci@...ey.karlin.mff.cuni.cz,
	ebiederm@...ssion.com, linux-kernel@...r.kernel.org,
	Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH 2.6.21-rc5 1/3] msi: introduce ARCH_SUPPORTS_MSI
	Kconfig option (rev2)

On Fri, 2007-03-30 at 16:05 -0700, Dan Williams wrote:
> Allows architectures to advertise that they support MSI rather than listing
> each architecture as a PCI_MSI dependency.
> 
> rev2:
> * update i386 and x86_64 as well
> 
> Signed-off-by: Dan Williams <dan.j.williams@...el.com>
> Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>

Hi Greg,

Are you planning on merging this one? AFAICT it still applies cleanly.
At the moment my powerpc MSI patches depend on it.

cheers


>  arch/arm/Kconfig     |    1 +
>  arch/i386/Kconfig    |    1 +
>  arch/ia64/Kconfig    |    1 +
>  arch/sparc64/Kconfig |    1 +
>  arch/x86_64/Kconfig  |    1 +
>  drivers/pci/Kconfig  |    6 +++++-
>  6 files changed, 10 insertions(+), 1 deletions(-)
> 
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index e7baca2..db00376 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -255,6 +255,7 @@ config ARCH_IOP13XX
>  	depends on MMU
>  	select PLAT_IOP
>  	select PCI
> +	select ARCH_SUPPORTS_MSI
>  	help
>  	  Support for Intel's IOP13XX (XScale) family of processors.
>  
> diff --git a/arch/i386/Kconfig b/arch/i386/Kconfig
> index 53d6237..bcf2fc4 100644
> --- a/arch/i386/Kconfig
> +++ b/arch/i386/Kconfig
> @@ -1073,6 +1073,7 @@ config PCI
>  	bool "PCI support" if !X86_VISWS
>  	depends on !X86_VOYAGER
>  	default y if X86_VISWS
> +	select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
>  	help
>  	  Find out whether you have a PCI motherboard. PCI is the name of a
>  	  bus system, i.e. the way the CPU talks to the other stuff inside
> diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
> index e19185d..3b71f97 100644
> --- a/arch/ia64/Kconfig
> +++ b/arch/ia64/Kconfig
> @@ -14,6 +14,7 @@ config IA64
>  	select PCI if (!IA64_HP_SIM)
>  	select ACPI if (!IA64_HP_SIM)
>  	select PM if (!IA64_HP_SIM)
> +	select ARCH_SUPPORTS_MSI
>  	default y
>  	help
>  	  The Itanium Processor Family is Intel's 64-bit successor to
> diff --git a/arch/sparc64/Kconfig b/arch/sparc64/Kconfig
> index 1a6348b..b9b2b52 100644
> --- a/arch/sparc64/Kconfig
> +++ b/arch/sparc64/Kconfig
> @@ -299,6 +299,7 @@ config SUN_IO
>  
>  config PCI
>  	bool "PCI support"
> +	select ARCH_SUPPORTS_MSI
>  	help
>  	  Find out whether you have a PCI motherboard. PCI is the name of a
>  	  bus system, i.e. the way the CPU talks to the other stuff inside
> diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
> index 56eb14c..e9b4f05 100644
> --- a/arch/x86_64/Kconfig
> +++ b/arch/x86_64/Kconfig
> @@ -676,6 +676,7 @@ menu "Bus options (PCI etc.)"
>  
>  config PCI
>  	bool "PCI support"
> +	select ARCH_SUPPORTS_MSI if (X86_LOCAL_APIC && X86_IO_APIC)
>  
>  # x86-64 doesn't support PCI BIOS access from long mode so always go direct.
>  config PCI_DIRECT
> diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
> index 5ea5bc7..70efe8f 100644
> --- a/drivers/pci/Kconfig
> +++ b/drivers/pci/Kconfig
> @@ -1,10 +1,14 @@
>  #
>  # PCI configuration
>  #
> +config ARCH_SUPPORTS_MSI
> +	bool
> +	default n
> +
>  config PCI_MSI
>  	bool "Message Signaled Interrupts (MSI and MSI-X)"
>  	depends on PCI
> -	depends on (X86_LOCAL_APIC && X86_IO_APIC) || IA64 || SPARC64
> +	depends on ARCH_SUPPORTS_MSI
>  	help
>  	   This allows device drivers to enable MSI (Message Signaled
>  	   Interrupts).  Message Signaled Interrupts enable a device to
-- 
Michael Ellerman
OzLabs, IBM Australia Development Lab

wwweb: http://michael.ellerman.id.au
phone: +61 2 6212 1183 (tie line 70 21183)

We do not inherit the earth from our ancestors,
we borrow it from our children. - S.M.A.R.T Person

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