linux-kernel - Re: [PATCH 05/10] x86/PCI: Clean up pci_cache_line

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Date:	Wed, 13 May 2009 09:45:38 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	the arch/x86 maintainers <x86@...nel.org>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Joerg Roedel <joerg.roedel@....com>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Xen-devel <xen-devel@...ts.xensource.com>,
	Alex Nixon <alex.nixon@...rix.com>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 05/10] x86/PCI: Clean up pci_cache_line_size

On Tue, 12 May 2009 14:48:06 -0700
Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> From: Alex Nixon <alex.nixon@...rix.com>
> 
> Separate out x86 cache_line_size initialisation code into its own
> function (so it can be shared by Xen later in this patch series)
> 
> [Impact: cleanup]
> Signed-off-by: Alex Nixon <alex.nixon@...rix.com>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
> Reviewed-by: "H. Peter Anvin" <hpa@...or.com>
> Reviewed-by: Matthew Wilcox <willy@...ux.intel.com>
> ---
>  arch/x86/include/asm/pci_x86.h |    1 +
>  arch/x86/pci/common.c          |   17 +++++++++++------
>  2 files changed, 12 insertions(+), 6 deletions(-)
> 
> diff --git a/arch/x86/include/asm/pci_x86.h
> b/arch/x86/include/asm/pci_x86.h index e60fd3e..5401ca2 100644
> --- a/arch/x86/include/asm/pci_x86.h
> +++ b/arch/x86/include/asm/pci_x86.h
> @@ -45,6 +45,7 @@ enum pci_bf_sort_state {
>  extern unsigned int pcibios_max_latency;
>  
>  void pcibios_resource_survey(void);
> +void pcibios_set_cache_line_size(void);
>  
>  /* pci-pc.c */
>  
> diff --git a/arch/x86/pci/common.c b/arch/x86/pci/common.c
> index 2202b62..011ff45 100644
> --- a/arch/x86/pci/common.c
> +++ b/arch/x86/pci/common.c
> @@ -412,26 +412,31 @@ struct pci_bus * __devinit
> pcibios_scan_root(int busnum) 
>  extern u8 pci_cache_line_size;
>  
> -int __init pcibios_init(void)
> +void __init pcibios_set_cache_line_size(void)
>  {
>  	struct cpuinfo_x86 *c = &boot_cpu_data;
>  
> -	if (!raw_pci_ops) {
> -		printk(KERN_WARNING "PCI: System does not support
> PCI\n");
> -		return 0;
> -	}
> -
>  	/*
>  	 * Assume PCI cacheline size of 32 bytes for all x86s except
> K7/K8
>  	 * and P4. It's also good for 386/486s (which actually have
> 16)
>  	 * as quite a few PCI devices do not support smaller values.
>  	 */
> +
>  	pci_cache_line_size = 32 >> 2;
>  	if (c->x86 >= 6 && c->x86_vendor == X86_VENDOR_AMD)
>  		pci_cache_line_size = 64 >> 2;	/* K7 & K8 */
>  	else if (c->x86 > 6 && c->x86_vendor == X86_VENDOR_INTEL)
>  		pci_cache_line_size = 128 >> 2;	/* P4 */
> +}
> +
> +int __init pcibios_init(void)
> +{
> +	if (!raw_pci_ops) {
> +		printk(KERN_WARNING "PCI: System does not support
> PCI\n");
> +		return 0;
> +	}
>  
> +	pcibios_set_cache_line_size();
>  	pcibios_resource_survey();
>  
>  	if (pci_bf_sort >= pci_force_bf)

Looks fine.

Reviewed-by: Jesse Barnes <jbarnes@...tuousgeek.org>


-- 
Jesse Barnes, Intel Open Source Technology Center
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