[PATCH 5/6] perf, x86: Allow for architecture specific RDPMC indexes

[Jacob Shin]

Similar to config_base and event_base, allow architecture specific
RDPMC ECX values.

Signed-off-by: Jacob Shin <jacob.shin@xxxxxxx>
---
 arch/x86/kernel/cpu/perf_event.c     |    2 +-
 arch/x86/kernel/cpu/perf_event.h     |    6 ++++++
 arch/x86/kernel/cpu/perf_event_amd.c |    6 ++++++
 3 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 4428fd1..b63982b 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -835,7 +835,7 @@ static inline void x86_assign_hw_event(struct perf_event *event,
 	} else {
 		hwc->config_base = x86_pmu_config_addr(hwc->idx);
 		hwc->event_base  = x86_pmu_event_addr(hwc->idx);
-		hwc->event_base_rdpmc = hwc->idx;
+		hwc->event_base_rdpmc = x86_pmu_rdpmc_index(hwc->idx);
 	}
 }
 
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index 015826e..4a26fb1 100644
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -326,6 +326,7 @@ struct x86_pmu {
 	unsigned	eventsel;
 	unsigned	perfctr;
 	int             (*addr_offset)(int index, int eventsel);
+	int             (*rdpmc_index)(int index);
 	u64		(*event_map)(int);
 	int		max_events;
 	int		num_counters;
@@ -459,6 +460,11 @@ static inline unsigned int x86_pmu_event_addr(int index)
 		(x86_pmu.addr_offset ? x86_pmu.addr_offset(index, 0) : index);
 }
 
+static inline int x86_pmu_rdpmc_index(int index)
+{
+	return x86_pmu.rdpmc_index ? x86_pmu.rdpmc_index(index) : index;
+}
+
 int x86_setup_perfctr(struct perf_event *event);
 
 int x86_pmu_hw_config(struct perf_event *event);
diff --git a/arch/x86/kernel/cpu/perf_event_amd.c b/arch/x86/kernel/cpu/perf_event_amd.c
index ef1df38..faf9072 100644
--- a/arch/x86/kernel/cpu/perf_event_amd.c
+++ b/arch/x86/kernel/cpu/perf_event_amd.c
@@ -173,6 +173,11 @@ static inline int amd_pmu_addr_offset(int index, int eventsel)
 	return offset;
 }
 
+static inline int amd_pmu_rdpmc_index(int index)
+{
+	return index;
+}
+
 static int amd_pmu_hw_config(struct perf_event *event)
 {
 	int ret;
@@ -620,6 +625,7 @@ static __initconst const struct x86_pmu amd_pmu = {
 	.eventsel		= MSR_K7_EVNTSEL0,
 	.perfctr		= MSR_K7_PERFCTR0,
 	.addr_offset            = amd_pmu_addr_offset,
+	.rdpmc_index		= amd_pmu_rdpmc_index,
 	.event_map		= amd_pmu_event_map,
 	.max_events		= ARRAY_SIZE(amd_perfmon_event_map),
 	.num_counters		= AMD64_NUM_COUNTERS,
-- 
1.7.9.5


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