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 c6998bc75456..b50e9d15aae0 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 55889e0b1452..930fe4879542 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);