diff options
| author | Gleb Natapov <gleb@redhat.com> | 2011-11-10 14:57:27 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-12-06 20:41:08 +0100 |
| commit | b3d9468a8bd218a695e3a0ff112cd4efd27b670a (patch) | |
| tree | 02e9ea935617716ae6667c06fd6819a89c715c15 /arch | |
| parent | c1d6f42f1a42c721513e2f388c208e5348004f64 (diff) | |
perf, x86: Expose perf capability to other modules
KVM needs to know perf capability to decide which PMU it can expose to a
guest.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1320929850-10480-8-git-send-email-gleb@redhat.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/perf_event.h | 15 | ||||
| -rw-r--r-- | arch/x86/kernel/cpu/perf_event.c | 12 |
2 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index c6998bc7545..b50e9d15aae 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 55889e0b145..930fe487954 100644 --- a/arch/x86/kernel/cpu/perf_event.c +++ b/arch/x86/kernel/cpu/perf_event.c @@ -1696,3 +1696,15 @@ 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 = x86_pmu.cntval_bits; + 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); |