linux-kernel - Re: [PATCH 3/5] x86: add cpu_node topology detection for AMD Magny-Cours

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Date:	Wed, 3 Jun 2009 16:48:07 +0200
From:	Bert Wesarg <bert.wesarg@...glemail.com>
To:	Andreas Herrmann <andreas.herrmann3@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] x86: add cpu_node topology detection for AMD 
	Magny-Cours

On Wed, Jun 3, 2009 at 16:35, Andreas Herrmann
<andreas.herrmann3@....com> wrote:
> This adapts CPU topology detection for AMD Magny-Cours.
>
> Here is example output from two cores on same package but different
> internal cpu_nodes:
>
> /sys/devices/system/cpu/cpu5:
>  physical_package_id        : 0
>  core_id                    : 5
>  thread_siblings            : 00000020
>  thread_siblings_list       : 5
>  cpu_node_id                : 0
>  cpu_node_siblings          : 0000003f
>  cpu_node_siblings_list     : 0-5
>  core_siblings              : 00000fff
>  core_siblings_list         : 0-11
> /sys/devices/system/cpu/cpu6:
>  physical_package_id        : 0
>  core_id                    : 0
>  thread_siblings            : 00000040
>  thread_siblings_list       : 6
>  cpu_node_id                : 1
>  cpu_node_siblings          : 00000fc0
>  cpu_node_siblings_list     : 6-11
>  core_siblings              : 00000fff
>  core_siblings_list         : 0-11
>
> Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
> ---
>  arch/x86/include/asm/cpufeature.h |    1 +
>  arch/x86/kernel/cpu/amd.c         |   61 +++++++++++++++++++++++++++++++++++++
>  2 files changed, 62 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
> index 728b375..feed057 100644
> --- a/arch/x86/kernel/cpu/amd.c
> +++ b/arch/x86/kernel/cpu/amd.c
> @@ -274,7 +328,14 @@ static void __cpuinit srat_detect_node(struct cpuinfo_x86 *c)
>        int node;
>        unsigned apicid = cpu_has_apic ? hard_smp_processor_id() : c->apicid;
>
> +#ifdef CONFIG_MULTI_NODE_CPU
> +       if (cpu_has(c, X86_FEATURE_AMD_DCM))
> +               node = (c->phys_proc_id << 1) + c->cpu_node_id;
> +       else
> +               node = c->phys_proc_id;
> +#else
>        node = c->phys_proc_id;
> +#endif
Stale CONFIG_MULTI_NODE_CPU?

Regards,
Bert

>        if (apicid_to_node[apicid] != NUMA_NO_NODE)
>                node = apicid_to_node[apicid];
>        if (!node_online(node)) {
> --
> 1.6.3.1
>
>
>
>
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