linux-kernel - Re: [PATCH 4/4] x86, amd: Support L3 Cache Partitioning on AMD family 0x15 CPUs

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Date:	Wed, 26 Jan 2011 11:56:37 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Hans Rosenfeld <hans.rosenfeld@....com>
Cc:	hpa@...or.com, tglx@...utronix.de, andreas.herrmann3@....com,
	linux-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH 4/4] x86, amd: Support L3 Cache Partitioning on AMD
 family 0x15 CPUs


* Hans Rosenfeld <hans.rosenfeld@....com> wrote:

> L3 Cache Partitioning allows selecting which of the 4 L3 subcaches can
> be used for evictions by the L2 cache of each compute unit. By writing a
> 4-bit hexadecimal mask into the the sysfs file /sys/devices/system/cpu/\
> cpuX/cache/index3/subcaches, the user can set the enabled subcaches for
> a CPU. The settings are directly read from and written to the hardware,
> so there is no way to have contradicting settings for two CPUs belonging
> to the same compute unit. Writing will always overwrite any previous
> setting for a compute unit.
> 
> Signed-off-by: Hans Rosenfeld <hans.rosenfeld@....com>
> ---
>  arch/x86/include/asm/amd_nb.h         |    3 +
>  arch/x86/kernel/amd_nb.c              |   55 +++++++++++++++++++++++++
>  arch/x86/kernel/cpu/intel_cacheinfo.c |   73 +++++++++++++++++++++++++++-----
>  3 files changed, 119 insertions(+), 12 deletions(-)

I have picked up the other 3 patches, but this one causes this build failure:

 arch/x86/kernel/amd_nb.c: In function ‘amd_get_subcaches’:
 arch/x86/kernel/amd_nb.c:129:36: error: ‘struct cpuinfo_x86’ has no member named ‘compute_unit_id’
 arch/x86/kernel/amd_nb.c: In function ‘amd_set_subcaches’:
 arch/x86/kernel/amd_nb.c:154:28: error: ‘struct cpuinfo_x86’ has no member named ‘compute_unit_id’
 arch/x86/kernel/amd_nb.c:155:36: error: ‘struct cpuinfo_x86’ has no member named ‘compute_unit_id’
 arch/x86/kernel/amd_nb.c: In function ‘amd_get_subcaches’:
 arch/x86/kernel/amd_nb.c:130:1: warning: control reaches end of non-void function

Thanks,

	Ingo
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