lkml.org 
[lkml]   [2009]   [Apr]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[tip:x86/cpu] x86: cacheinfo: disable L3 ECC scrubbing when L3 cache index is disabled
Commit-ID:  ba518bea2db21c72d44a6cbfd825b026ef9cdcb6
Gitweb: http://git.kernel.org/tip/ba518bea2db21c72d44a6cbfd825b026ef9cdcb6
Author: Mark Langsdorf <mark.langsdorf@amd.com>
AuthorDate: Thu, 9 Apr 2009 15:24:06 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Fri, 10 Apr 2009 14:22:34 +0200

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@amd.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <20090409132406.GK31527@alberich.amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
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 fc28291..d46a849 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);

\
 
 \ /
  Last update: 2009-04-10 14:43    [from the cache]
©2003-2014 Jasper Spaans. Advertise on this site