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    SubjectRe: [PATCH 1/3] perf/x86/amd: AMD support for bp_len > HW_BREAKPOINT_LEN_8
    On Wed, Oct 02, 2013 at 11:11:06AM -0500, suravee.suthikulpanit@amd.com wrote:
    > From: Jacob Shin <jacob.w.shin@gmail.com>
    >
    > Implement hardware breakpoint address mask for AMD Family 16h and
    > above processors. CPUID feature bit indicates hardware support for
    > DRn_ADDR_MASK MSRs. These masks further qualify DRn/DR7 hardware
    > breakpoint addresses to allow matching of larger addresses ranges.
    >
    > Valuable advice and pseudo code from Oleg Nesterov <oleg@redhat.com>
    >
    > Signed-off-by: Jacob Shin <jacob.w.shin@gmail.com>
    > Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
    > ---
    > arch/x86/include/asm/cpufeature.h | 2 ++
    > arch/x86/include/asm/debugreg.h | 5 ++++
    > arch/x86/include/asm/hw_breakpoint.h | 1 +
    > arch/x86/include/uapi/asm/msr-index.h | 4 +++
    > arch/x86/kernel/cpu/amd.c | 19 ++++++++++++++
    > arch/x86/kernel/hw_breakpoint.c | 47 ++++++++++++++---------------------
    > 6 files changed, 49 insertions(+), 29 deletions(-)
    >
    > diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
    > index d3f5c63..26609bb 100644
    > --- a/arch/x86/include/asm/cpufeature.h
    > +++ b/arch/x86/include/asm/cpufeature.h
    > @@ -170,6 +170,7 @@
    > #define X86_FEATURE_TOPOEXT (6*32+22) /* topology extensions CPUID leafs */
    > #define X86_FEATURE_PERFCTR_CORE (6*32+23) /* core performance counter extensions */
    > #define X86_FEATURE_PERFCTR_NB (6*32+24) /* NB performance counter extensions */
    > +#define X86_FEATURE_BPEXT (6*32+26) /* data breakpoint extension */

    Does this feature only work on data breakpoint or is instruction breakpoint
    address range supported as well?


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