arm64: perf: add support for Cortex-A72

Cortex-A72 has a PMUv3 implementation that is compatible with the PMU
implemented by Cortex-A57.

This patch hooks up the new compatible string so that the Cortex-A57
event mappings are used.

Signed-off-by: Will Deacon <will.deacon@arm.com>

diff --git a/Documentation/devicetree/bindings/arm/pmu.txt b/Documentation/devicetree/bindings/arm/pmu.txt
index a6cd148..5651883 100644 (file)
--- a/Documentation/devicetree/bindings/arm/pmu.txt
+++ b/Documentation/devicetree/bindings/arm/pmu.txt
@@ -9,6 +9,7 @@ Required properties:
 - compatible : should be one of
        "apm,potenza-pmu"
        "arm,armv8-pmuv3"
+       "arm,cortex-a72-pmu"
        "arm,cortex-a57-pmu"
        "arm,cortex-a53-pmu"
        "arm,cortex-a17-pmu"

diff --git a/arch/arm64/kernel/perf_event.c b/arch/arm64/kernel/perf_event.c
index 6fdcfb6..f7ab14c 100644 (file)
--- a/arch/arm64/kernel/perf_event.c
+++ b/arch/arm64/kernel/perf_event.c
@@ -90,7 +90,7 @@
 /* ARMv8 Cortex-A53 specific event types. */
 #define ARMV8_A53_PERFCTR_PREFETCH_LINEFILL                    0xC2
 
-/* ARMv8 Cortex-A57 specific event types. */
+/* ARMv8 Cortex-A57 and Cortex-A72 specific event types. */
 #define ARMV8_A57_PERFCTR_L1_DCACHE_ACCESS_LD                  0x40
 #define ARMV8_A57_PERFCTR_L1_DCACHE_ACCESS_ST                  0x41
 #define ARMV8_A57_PERFCTR_L1_DCACHE_REFILL_LD                  0x42
@@ -120,6 +120,7 @@ static const unsigned armv8_a53_perf_map[PERF_COUNT_HW_MAX] = {
        [PERF_COUNT_HW_BUS_CYCLES]              = ARMV8_PMUV3_PERFCTR_BUS_CYCLES,
 };
 
+/* ARM Cortex-A57 and Cortex-A72 events mapping. */
 static const unsigned armv8_a57_perf_map[PERF_COUNT_HW_MAX] = {
        PERF_MAP_ALL_UNSUPPORTED,
        [PERF_COUNT_HW_CPU_CYCLES]              = ARMV8_PMUV3_PERFCTR_CLOCK_CYCLES,
@@ -801,10 +802,20 @@ static int armv8_a57_pmu_init(struct arm_pmu *cpu_pmu)
        return armv8pmu_probe_num_events(cpu_pmu);
 }
 
+static int armv8_a72_pmu_init(struct arm_pmu *cpu_pmu)
+{
+       armv8_pmu_init(cpu_pmu);
+       cpu_pmu->name                   = "armv8_cortex_a72";
+       cpu_pmu->map_event              = armv8_a57_map_event;
+       cpu_pmu->pmu.attr_groups        = armv8_pmuv3_attr_groups;
+       return armv8pmu_probe_num_events(cpu_pmu);
+}
+
 static const struct of_device_id armv8_pmu_of_device_ids[] = {
        {.compatible = "arm,armv8-pmuv3",       .data = armv8_pmuv3_init},
        {.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},
        {},
 };