[PATCH 1/3] arm64: perf: add support for Cortex-A55

[Jisheng Zhang]

The Cortex-A55 uses some implementation defined perf events. This
patch sets up the necessary mapping for Cortex-A55.

Mappings are based on Cortex-A55 TRM r2p0, section C2.4 PMU Events
(pages C2-567 to C2-582).

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@xxxxxxxxxxxxx>
---
 arch/arm64/kernel/perf_event.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 4d7879484cec..743affbe0cca 100644
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -21,7 +21,7 @@
 #include <linux/platform_device.h>
 #include <linux/smp.h>
 
-/* ARMv8 Cortex-A53 specific event types. */
+/* ARMv8 Cortex-A53/A55 specific event types. */
 #define ARMV8_A53_PERFCTR_PREF_LINEFILL				0xC2
 
 /* ARMv8 Cavium ThunderX specific event types. */
@@ -81,6 +81,22 @@ static const unsigned armv8_a53_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 	[C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
 };
 
+static const unsigned armv8_a55_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
+					      [PERF_COUNT_HW_CACHE_OP_MAX]
+					      [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+	PERF_CACHE_MAP_ALL_UNSUPPORTED,
+
+	[C(L1D)][C(OP_READ)][C(RESULT_ACCESS)]	= ARMV8_IMPDEF_PERFCTR_L1D_CACHE_RD,
+	[C(L1D)][C(OP_READ)][C(RESULT_MISS)]	= ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_RD,
+	[C(L1D)][C(OP_WRITE)][C(RESULT_ACCESS)]	= ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
+	[C(L1D)][C(OP_WRITE)][C(RESULT_MISS)]	= ARMV8_IMPDEF_PERFCTR_L1D_CACHE_REFILL_WR,
+	[C(L1D)][C(OP_PREFETCH)][C(RESULT_MISS)] = ARMV8_A53_PERFCTR_PREF_LINEFILL,
+
+
+	[C(NODE)][C(OP_READ)][C(RESULT_ACCESS)]	= ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_RD,
+	[C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
+};
+
 static const unsigned armv8_a57_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 					      [PERF_COUNT_HW_CACHE_OP_MAX]
 					      [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
@@ -909,6 +925,11 @@ static int armv8_a53_map_event(struct perf_event *event)
 	return __armv8_pmuv3_map_event(event, NULL, &armv8_a53_perf_cache_map);
 }
 
+static int armv8_a55_map_event(struct perf_event *event)
+{
+	return __armv8_pmuv3_map_event(event, NULL, &armv8_a55_perf_cache_map);
+}
+
 static int armv8_a57_map_event(struct perf_event *event)
 {
 	return __armv8_pmuv3_map_event(event, NULL, &armv8_a57_perf_cache_map);
@@ -1050,7 +1071,7 @@ static int armv8_a53_pmu_init(struct arm_pmu *cpu_pmu)
 static int armv8_a55_pmu_init(struct arm_pmu *cpu_pmu)
 {
 	return armv8_pmu_init(cpu_pmu, "armv8_cortex_a55",
-			      armv8_pmuv3_map_event, NULL, NULL);
+			      armv8_a55_map_event, NULL, NULL);
 }
 
 static int armv8_a57_pmu_init(struct arm_pmu *cpu_pmu)
-- 
2.27.0