linux-kernel - Re: [patches] [PATCH] [17/58] i386: Add L3 cache support to AMD CPUID4 emulation

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Date:	Fri, 20 Jul 2007 19:00:49 +0200
From:	"Andreas Herrmann" <andreas.herrmann3@....com>
To:	"Andi Kleen" <ak@...e.de>
cc:	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [patches] [PATCH] [17/58] i386: Add L3 cache support to AMD
 CPUID4 emulation

On Thu, Jul 19, 2007 at 11:55:02AM +0200, Andi Kleen wrote:
> 
> With that an L3 cache is correctly reported in the cache information in /sys
> 
> With fixes from Andreas Herrmann and Dean Gaudet
> 
> Signed-off-by: Andi Kleen <ak@...e.de>
> 
> ---
>  arch/i386/kernel/cpu/intel_cacheinfo.c |   74 ++++++++++++++++++++++++---------
>  arch/x86_64/kernel/setup.c             |    7 ++-
>  2 files changed, 60 insertions(+), 21 deletions(-)

Reporting of L3 cache information should also be enabled in 32bit mode.


Regards,

Andreas
--

Enable reporting of L3 cache info in 32 bit mode for family 0x10.

Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>

diff --git a/arch/i386/kernel/cpu/amd.c b/arch/i386/kernel/cpu/amd.c
index 6f47eee..815a5f0 100644
--- a/arch/i386/kernel/cpu/amd.c
+++ b/arch/i386/kernel/cpu/amd.c
@@ -272,8 +272,12 @@ static void __cpuinit init_amd(struct cpuinfo_x86 *c)
 	}
 #endif
 
-	if (cpuid_eax(0x80000000) >= 0x80000006)
-		num_cache_leaves = 3;
+	if (cpuid_eax(0x80000000) >= 0x80000006) {
+		if ((c->x86 == 0x10) && (cpuid_edx(0x80000006) & 0xf000))
+			num_cache_leaves = 4;
+		else
+			num_cache_leaves = 3;
+	}
 
 	if (amd_apic_timer_broken())
 		set_bit(X86_FEATURE_LAPIC_TIMER_BROKEN, c->x86_capability);



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