arm64: perf: add support for Cortex-A73

The Cortex-A73 uses some implementation defined perf events.

This patch sets up the necessary mapping for Cortex-A73.

Mappings are based on Cortex-A73 TRM r0p2, section 11.9 Events
(pages 11-457 to 11-460).

Signed-off-by: Julien Thierry <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Signed-off-by: Will Deacon <[e-mail]>

Documentation/devicetree/bindings/arm/pmu.txt

···
 - compatible : should be one of
 	"apm,potenza-pmu"
 	"arm,armv8-pmuv3"
+	"arm,cortex-a73-pmu"
 	"arm,cortex-a72-pmu"
 	"arm,cortex-a57-pmu"
 	"arm,cortex-a53-pmu"

arch/arm64/kernel/perf_event.c

···
 	[C(NODE)][C(OP_WRITE)][C(RESULT_ACCESS)] = ARMV8_IMPDEF_PERFCTR_BUS_ACCESS_WR,
 };
 
+static const unsigned armv8_a73_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_WRITE)][C(RESULT_ACCESS)]	= ARMV8_IMPDEF_PERFCTR_L1D_CACHE_WR,
+
+	[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,
+
+	[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_thunder_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 						   [PERF_COUNT_HW_CACHE_OP_MAX]
 						   [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
···
 	return __armv8_pmuv3_map_event(event, NULL, &armv8_a57_perf_cache_map);
 }
 
+static int armv8_a73_map_event(struct perf_event *event)
+{
+	return __armv8_pmuv3_map_event(event, NULL, &armv8_a73_perf_cache_map);
+}
+
 static int armv8_thunder_map_event(struct perf_event *event)
 {
 	return __armv8_pmuv3_map_event(event, NULL,
···
 	return 0;
 }
 
+static int armv8_a73_pmu_init(struct arm_pmu *cpu_pmu)
+{
+	int ret = armv8_pmu_init(cpu_pmu);
+	if (ret)
+		return ret;
+
+	cpu_pmu->name			= "armv8_cortex_a73";
+	cpu_pmu->map_event		= armv8_a73_map_event;
+	cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] =
+		&armv8_pmuv3_events_attr_group;
+	cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_FORMATS] =
+		&armv8_pmuv3_format_attr_group;
+
+	return 0;
+}
+
 static int armv8_thunder_pmu_init(struct arm_pmu *cpu_pmu)
 {
 	int ret = armv8_pmu_init(cpu_pmu);
···
 	{.compatible = "arm,cortex-a53-pmu",	.data = armv8_a53_pmu_init},
 	{.compatible = "arm,cortex-a57-pmu",	.data = armv8_a57_pmu_init},
 	{.compatible = "arm,cortex-a72-pmu",	.data = armv8_a72_pmu_init},
+	{.compatible = "arm,cortex-a73-pmu",	.data = armv8_a73_pmu_init},
 	{.compatible = "cavium,thunder-pmu",	.data = armv8_thunder_pmu_init},
 	{.compatible = "brcm,vulcan-pmu",	.data = armv8_vulcan_pmu_init},
 	{},