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    Subject[PATCHv3 07/10] perf, x86: expose perf capability to other modules.
    Date
    KVM needs to know perf capability to decide which PMU it can expose to a
    guest.

    Signed-off-by: Gleb Natapov <gleb@redhat.com>
    ---
    arch/x86/include/asm/perf_event.h | 15 +++++++++++++++
    arch/x86/kernel/cpu/perf_event.c | 11 +++++++++++
    2 files changed, 26 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
    index c6998bc..5487ad6 100644
    --- a/arch/x86/include/asm/perf_event.h
    +++ b/arch/x86/include/asm/perf_event.h
    @@ -95,6 +95,15 @@ union cpuid10_edx {
    unsigned int full;
    };

    +struct x86_pmu_capability {
    + int version;
    + int num_counters_gp;
    + int num_counters_fixed;
    + int bit_width_gp;
    + int bit_width_fixed;
    + unsigned int events_mask;
    + int events_mask_len;
    +};

    /*
    * Fixed-purpose performance events:
    @@ -216,6 +225,7 @@ struct perf_guest_switch_msr {
    };

    extern struct perf_guest_switch_msr *perf_guest_get_msrs(int *nr);
    +extern void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap);
    #else
    static inline perf_guest_switch_msr *perf_guest_get_msrs(int *nr)
    {
    @@ -223,6 +233,11 @@ static inline perf_guest_switch_msr *perf_guest_get_msrs(int *nr)
    return NULL;
    }

    +static inline void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap)
    +{
    + memset(cap, 0, sizeof(*cap));
    +}
    +
    static inline void perf_events_lapic_init(void) { }
    #endif

    diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
    index 6408910..5af5996 100644
    --- a/arch/x86/kernel/cpu/perf_event.c
    +++ b/arch/x86/kernel/cpu/perf_event.c
    @@ -1570,3 +1570,14 @@ unsigned long perf_misc_flags(struct pt_regs *regs)

    return misc;
    }
    +
    +void perf_get_x86_pmu_capability(struct x86_pmu_capability *cap)
    +{
    + cap->version = x86_pmu.version;
    + cap->num_counters_gp = x86_pmu.num_counters;
    + cap->num_counters_fixed = x86_pmu.num_counters_fixed;
    + cap->bit_width_gp = cap->bit_width_fixed = x86_pmu.cntval_bits;
    + cap->events_mask = (unsigned int)x86_pmu.events_maskl;
    + cap->events_mask_len = x86_pmu.events_mask_len;
    +}
    +EXPORT_SYMBOL_GPL(perf_get_x86_pmu_capability);
    --
    1.7.7.1


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