linux-kernel - [PATCH 7/8] x86: cacheinfo: disable L3 ECC scrubbing when L3 cache index is disabled

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Date:	Thu, 9 Apr 2009 15:24:06 +0200
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	Mark Langsdorf <mark.langsdorf@....com>
Subject: [PATCH 7/8] x86: cacheinfo: disable L3 ECC scrubbing when L3 cache
	index is disabled

From: Mark Langsdorf <mark.langsdorf@....com>

x86: cacheinfo: disable L3 ECC scrubbing when L3 cache index is disabled

(Use correct mask to zero out bits 24-28 by Andreas)

Signed-off-by: Mark Langsdorf <mark.langsdorf@....com>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@....com>
---
 arch/x86/kernel/cpu/intel_cacheinfo.c |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 55d134f..47e4fb4 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -731,6 +731,7 @@ static ssize_t store_cache_disable(struct _cpuid4_info *this_leaf,
 	int node = cpu_to_node(cpu);
 	struct pci_dev *dev = node_to_k8_nb_misc(node);
 	unsigned long val = 0;
+	unsigned int scrubber = 0;
 
 	if (!this_leaf->can_disable)
 		return -EINVAL;
@@ -745,6 +746,11 @@ static ssize_t store_cache_disable(struct _cpuid4_info *this_leaf,
 		return -EINVAL;
 
 	val |= 0xc0000000;
+
+	pci_read_config_dword(dev, 0x58, &scrubber);
+	scrubber &= ~0x1f000000;
+	pci_write_config_dword(dev, 0x58, scrubber);
+
 	pci_write_config_dword(dev, 0x1BC + index * 4, val & ~0x40000000);
 	wbinvd();
 	pci_write_config_dword(dev, 0x1BC + index * 4, val);
-- 
1.6.2



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