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Re: [PATCH v4 2/2] amd: uncore: Get correct number of cores sharing last level cache

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  Re: [PATCH v4 2/2] amd: uncore: Get correct number of cores sharing  last level cache Borislav Petkov <bp@alien8.de> - 2017-06-15 10:50 +0200

#1666567 — Re: [PATCH v4 2/2] amd: uncore: Get correct number of cores sharing last level cache

On Wed, Jun 14, 2017 at 11:26:58AM -0500, Janakarajan Natarajan wrote:
> In Family 17h, the number of cores sharing a cache level is obtained
> from the Cache Properties CPUID leaf (0x8000001d) by passing in the
> cache level in ECX. In prior families, a cache level of 2 was used to
> determine this information.
> 
> To get the right information, irrespective of Family, iterate over
> the cache levels using CPUID 0x8000001d. The last level cache is the
> last value to return a non-zero value in EAX.
> 
> Signed-off-by: Janakarajan Natarajan <Janakarajan.Natarajan@amd.com>
> ---
>  arch/x86/events/amd/uncore.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)

Reviewed-by: Borislav Petkov <bp@suse.de>

-- 
Regards/Gruss,
    Boris.

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