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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>
This commit is contained in:
Gleb Natapov 2011-11-10 14:57:27 +02:00 committed by Ingo Molnar
parent c1d6f42f1a
commit b3d9468a8b
2 changed files with 27 additions and 0 deletions
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15
arch/x86/include/asm/perf_event.h
View File

@ -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

12
arch/x86/kernel/cpu/perf_event.c
View File

@ -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);