10 files changed, 41 insertions, 18 deletions

diff --git a/arch/arm/include/asm/perf_event.h b/arch/arm/include/asm/perf_event.h
index 0f8e3827a89..08f94d8fc04 100644
--- a/arch/arm/include/asm/perf_event.h
+++ b/arch/arm/include/asm/perf_event.h
@@ -12,10 +12,6 @@
 #ifndef __ARM_PERF_EVENT_H__
 #define __ARM_PERF_EVENT_H__
 
-/* ARM performance counters start from 1 (in the cp15 accesses) so use the
- * same indexes here for consistency. */
-#define PERF_EVENT_INDEX_OFFSET 1
-
 /* ARM perf PMU IDs for use by internal perf clients. */
 enum arm_perf_pmu_ids {
         ARM_PERF_PMU_ID_XSCALE1 = 0,
diff --git a/arch/frv/include/asm/perf_event.h b/arch/frv/include/asm/perf_event.h
index a69e0155d14..c52ea5546b5 100644
--- a/arch/frv/include/asm/perf_event.h
+++ b/arch/frv/include/asm/perf_event.h
@@ -12,6 +12,4 @@
 #ifndef _ASM_PERF_EVENT_H
 #define _ASM_PERF_EVENT_H
 
-#define PERF_EVENT_INDEX_OFFSET 0
-
 #endif /* _ASM_PERF_EVENT_H */
diff --git a/arch/hexagon/include/asm/perf_event.h b/arch/hexagon/include/asm/perf_event.h
index 6c2910f9118..8b8526b491c 100644
--- a/arch/hexagon/include/asm/perf_event.h
+++ b/arch/hexagon/include/asm/perf_event.h
@@ -19,6 +19,4 @@
 #ifndef _ASM_PERF_EVENT_H
 #define _ASM_PERF_EVENT_H
 
-#define PERF_EVENT_INDEX_OFFSET 0
-
 #endif /* _ASM_PERF_EVENT_H */
diff --git a/arch/powerpc/include/asm/perf_event_server.h b/arch/powerpc/include/asm/perf_event_server.h
index 8f1df1208d2..1a8093fa8f7 100644
--- a/arch/powerpc/include/asm/perf_event_server.h
+++ b/arch/powerpc/include/asm/perf_event_server.h
@@ -61,8 +61,6 @@ struct pt_regs;
 extern unsigned long perf_misc_flags(struct pt_regs *regs);
 extern unsigned long perf_instruction_pointer(struct pt_regs *regs);
 
-#define PERF_EVENT_INDEX_OFFSET 1
-
 /*
  * Only override the default definitions in include/linux/perf_event.h
  * if we have hardware PMU support.
diff --git a/arch/powerpc/kernel/perf_event.c b/arch/powerpc/kernel/perf_event.c
index 10a140f82cb..d614ab57ccc 100644
--- a/arch/powerpc/kernel/perf_event.c
+++ b/arch/powerpc/kernel/perf_event.c
@@ -1187,6 +1187,11 @@ static int power_pmu_event_init(struct perf_event *event)
         return err;
 }
 
+static int power_pmu_event_idx(struct perf_event *event)
+{
+        return event->hw.idx;
+}
+
 struct pmu power_pmu = {
         .pmu_enable     = power_pmu_enable,
         .pmu_disable    = power_pmu_disable,
@@ -1199,6 +1204,7 @@ struct pmu power_pmu = {
         .start_txn      = power_pmu_start_txn,
         .cancel_txn     = power_pmu_cancel_txn,
         .commit_txn     = power_pmu_commit_txn,
+        .event_idx      = power_pmu_event_idx,
 };
 
 /*
diff --git a/arch/s390/include/asm/perf_event.h b/arch/s390/include/asm/perf_event.h
index a75f168d271..4eb444edbe4 100644
--- a/arch/s390/include/asm/perf_event.h
+++ b/arch/s390/include/asm/perf_event.h
@@ -6,4 +6,3 @@
 
 /* Empty, just to avoid compiling error */
 
-#define PERF_EVENT_INDEX_OFFSET 0
diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h
index 096c975e099..9b922c13625 100644
--- a/arch/x86/include/asm/perf_event.h
+++ b/arch/x86/include/asm/perf_event.h
@@ -188,8 +188,6 @@ extern u32 get_ibs_caps(void);
 #ifdef CONFIG_PERF_EVENTS
 extern void perf_events_lapic_init(void);
 
-#define PERF_EVENT_INDEX_OFFSET                 0
-
 /*
  * Abuse bit 3 of the cpu eflags register to indicate proper PEBS IP fixups.
  * This flag is otherwise unused and ABI specified to be 0, so nobody should
diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 08855613ceb..02545e6df95 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -680,6 +680,12 @@ struct pmu {
          * for each successful ->add() during the transaction.
          */
         void (*cancel_txn)              (struct pmu *pmu); /* optional */
+
+        /*
+         * Will return the value for perf_event_mmap_page::index for this event,
+         * if no implementation is provided it will default to: event->hw.idx + 1.
+         */
+        int (*event_idx)                (struct perf_event *event); /*optional */
 };
 
 /**
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 0ca1f648ac0..3894309c41a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3208,10 +3208,6 @@ int perf_event_task_disable(void)
         return 0;
 }
 
-#ifndef PERF_EVENT_INDEX_OFFSET
-# define PERF_EVENT_INDEX_OFFSET 0
-#endif
-
 static int perf_event_index(struct perf_event *event)
 {
         if (event->hw.state & PERF_HES_STOPPED)
@@ -3220,7 +3216,7 @@ static int perf_event_index(struct perf_event *event)
         if (event->state != PERF_EVENT_STATE_ACTIVE)
                 return 0;
 
-        return event->hw.idx + 1 - PERF_EVENT_INDEX_OFFSET;
+        return event->pmu->event_idx(event);
 }
 
 static void calc_timer_values(struct perf_event *event,
@@ -4992,6 +4988,11 @@ static int perf_swevent_init(struct perf_event *event)
         return 0;
 }
 
+static int perf_swevent_event_idx(struct perf_event *event)
+{
+        return 0;
+}
+
 static struct pmu perf_swevent = {
         .task_ctx_nr    = perf_sw_context,
 
@@ -5001,6 +5002,8 @@ static struct pmu perf_swevent = {
         .start          = perf_swevent_start,
         .stop           = perf_swevent_stop,
         .read           = perf_swevent_read,
+
+        .event_idx      = perf_swevent_event_idx,
 };
 
 #ifdef CONFIG_EVENT_TRACING
@@ -5087,6 +5090,8 @@ static struct pmu perf_tracepoint = {
         .start          = perf_swevent_start,
         .stop           = perf_swevent_stop,
         .read           = perf_swevent_read,
+
+        .event_idx      = perf_swevent_event_idx,
 };
 
 static inline void perf_tp_register(void)
@@ -5306,6 +5311,8 @@ static struct pmu perf_cpu_clock = {
         .start          = cpu_clock_event_start,
         .stop           = cpu_clock_event_stop,
         .read           = cpu_clock_event_read,
+
+        .event_idx      = perf_swevent_event_idx,
 };
 
 /*
@@ -5378,6 +5385,8 @@ static struct pmu perf_task_clock = {
         .start          = task_clock_event_start,
         .stop           = task_clock_event_stop,
         .read           = task_clock_event_read,
+
+        .event_idx      = perf_swevent_event_idx,
 };
 
 static void perf_pmu_nop_void(struct pmu *pmu)
@@ -5405,6 +5414,11 @@ static void perf_pmu_cancel_txn(struct pmu *pmu)
         perf_pmu_enable(pmu);
 }
 
+static int perf_event_idx_default(struct perf_event *event)
+{
+        return event->hw.idx + 1;
+}
+
 /*
  * Ensures all contexts with the same task_ctx_nr have the same
  * pmu_cpu_context too.
@@ -5594,6 +5608,9 @@ got_cpu_context:
                 pmu->pmu_disable = perf_pmu_nop_void;
         }
 
+        if (!pmu->event_idx)
+                pmu->event_idx = perf_event_idx_default;
+
         list_add_rcu(&pmu->entry, &pmus);
         ret = 0;
 unlock:
diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
index b7971d6f38b..b0309f76d77 100644
--- a/kernel/events/hw_breakpoint.c
+++ b/kernel/events/hw_breakpoint.c
@@ -613,6 +613,11 @@ static void hw_breakpoint_stop(struct perf_event *bp, int flags)
         bp->hw.state = PERF_HES_STOPPED;
 }
 
+static int hw_breakpoint_event_idx(struct perf_event *bp)
+{
+        return 0;
+}
+
 static struct pmu perf_breakpoint = {
         .task_ctx_nr    = perf_sw_context, /* could eventually get its own */
 
@@ -622,6 +627,8 @@ static struct pmu perf_breakpoint = {
         .start          = hw_breakpoint_start,
         .stop           = hw_breakpoint_stop,
         .read           = hw_breakpoint_pmu_read,
+
+        .event_idx      = hw_breakpoint_event_idx,
 };
 
 int __init init_hw_breakpoint(void)