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    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);

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