ARM: perf: add support for the Cortex-A5 PMU

This patch adds support for the Cortex-A5 PMU to the ARMv7 perf-event
backend.

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

3 files changed, 150 insertions, 0 deletions

diff --git a/arch/arm/include/asm/perf_event.h b/arch/arm/include/asm/perf_event.h
index c4aa4e8c6af9..207bd3c79ab6 100644
--- a/arch/arm/include/asm/perf_event.h
+++ b/arch/arm/include/asm/perf_event.h
@@ -24,6 +24,7 @@ enum arm_perf_pmu_ids {
         ARM_PERF_PMU_ID_V6MP,
         ARM_PERF_PMU_ID_CA8,
         ARM_PERF_PMU_ID_CA9,
+        ARM_PERF_PMU_ID_CA5,
         ARM_NUM_PMU_IDS,
 };
 
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index d53c0abc4dd3..df4e517687bf 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -660,6 +660,9 @@ init_hw_perf_events(void)
                 case 0xC090:    /* Cortex-A9 */
                         armpmu = armv7_a9_pmu_init();
                         break;
+                case 0xC050:    /* Cortex-A5 */
+                        armpmu = armv7_a5_pmu_init();
+                        break;
                 }
         /* Intel CPUs [xscale]. */
         } else if (0x69 == implementor) {
diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index 01b1145f07e5..db1d6c4a32ac 100644
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -153,6 +153,21 @@ enum armv7_a9_perf_types {
         ARMV7_PERFCTR_PLE_RQST_PROG             = 0xA5
 };
 
+/* ARMv7 Cortex-A5 specific event types */
+enum armv7_a5_perf_types {
+        ARMV7_PERFCTR_IRQ_TAKEN                 = 0x86,
+        ARMV7_PERFCTR_FIQ_TAKEN                 = 0x87,
+
+        ARMV7_PERFCTR_EXT_MEM_RQST              = 0xc0,
+        ARMV7_PERFCTR_NC_EXT_MEM_RQST           = 0xc1,
+        ARMV7_PERFCTR_PREFETCH_LINEFILL         = 0xc2,
+        ARMV7_PERFCTR_PREFETCH_LINEFILL_DROP    = 0xc3,
+        ARMV7_PERFCTR_ENTER_READ_ALLOC          = 0xc4,
+        ARMV7_PERFCTR_READ_ALLOC                = 0xc5,
+
+        ARMV7_PERFCTR_STALL_SB_FULL             = 0xc9,
+};
+
 /*
  * Cortex-A8 HW events mapping
  *
@@ -379,6 +394,122 @@ static const unsigned armv7_a9_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
 };
 
 /*
+ * Cortex-A5 HW events mapping
+ */
+static const unsigned armv7_a5_perf_map[PERF_COUNT_HW_MAX] = {
+        [PERF_COUNT_HW_CPU_CYCLES]          = ARMV7_PERFCTR_CPU_CYCLES,
+        [PERF_COUNT_HW_INSTRUCTIONS]        = ARMV7_PERFCTR_INSTR_EXECUTED,
+        [PERF_COUNT_HW_CACHE_REFERENCES]    = HW_OP_UNSUPPORTED,
+        [PERF_COUNT_HW_CACHE_MISSES]        = HW_OP_UNSUPPORTED,
+        [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = ARMV7_PERFCTR_PC_WRITE,
+        [PERF_COUNT_HW_BRANCH_MISSES]       = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+        [PERF_COUNT_HW_BUS_CYCLES]          = HW_OP_UNSUPPORTED,
+};
+
+static const unsigned armv7_a5_perf_cache_map[PERF_COUNT_HW_CACHE_MAX]
+                                        [PERF_COUNT_HW_CACHE_OP_MAX]
+                                        [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+        [C(L1D)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]
+                                        = ARMV7_PERFCTR_DCACHE_ACCESS,
+                        [C(RESULT_MISS)]
+                                        = ARMV7_PERFCTR_DCACHE_REFILL,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]
+                                        = ARMV7_PERFCTR_DCACHE_ACCESS,
+                        [C(RESULT_MISS)]
+                                        = ARMV7_PERFCTR_DCACHE_REFILL,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]
+                                        = ARMV7_PERFCTR_PREFETCH_LINEFILL,
+                        [C(RESULT_MISS)]
+                                        = ARMV7_PERFCTR_PREFETCH_LINEFILL_DROP,
+                },
+        },
+        [C(L1I)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = ARMV7_PERFCTR_L1_ICACHE_ACCESS,
+                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_IFETCH_MISS,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = ARMV7_PERFCTR_L1_ICACHE_ACCESS,
+                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_IFETCH_MISS,
+                },
+                /*
+                 * The prefetch counters don't differentiate between the I
+                 * side and the D side.
+                 */
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]
+                                        = ARMV7_PERFCTR_PREFETCH_LINEFILL,
+                        [C(RESULT_MISS)]
+                                        = ARMV7_PERFCTR_PREFETCH_LINEFILL_DROP,
+                },
+        },
+        [C(LL)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(DTLB)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_DTLB_REFILL,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_DTLB_REFILL,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(ITLB)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_ITLB_MISS,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = ARMV7_PERFCTR_ITLB_MISS,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+        [C(BPU)] = {
+                [C(OP_READ)] = {
+                        [C(RESULT_ACCESS)]      = ARMV7_PERFCTR_PC_BRANCH_PRED,
+                        [C(RESULT_MISS)]
+                                        = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+                },
+                [C(OP_WRITE)] = {
+                        [C(RESULT_ACCESS)]      = ARMV7_PERFCTR_PC_BRANCH_PRED,
+                        [C(RESULT_MISS)]
+                                        = ARMV7_PERFCTR_PC_BRANCH_MIS_PRED,
+                },
+                [C(OP_PREFETCH)] = {
+                        [C(RESULT_ACCESS)]      = CACHE_OP_UNSUPPORTED,
+                        [C(RESULT_MISS)]        = CACHE_OP_UNSUPPORTED,
+                },
+        },
+};
+
+/*
  * Perf Events counters
  */
 enum armv7_counters {
@@ -910,6 +1041,16 @@ static const struct arm_pmu *__init armv7_a9_pmu_init(void)
         armv7pmu.num_events     = armv7_read_num_pmnc_events();
         return &armv7pmu;
 }
+
+static const struct arm_pmu *__init armv7_a5_pmu_init(void)
+{
+        armv7pmu.id             = ARM_PERF_PMU_ID_CA5;
+        armv7pmu.name           = "ARMv7 Cortex-A5";
+        armv7pmu.cache_map      = &armv7_a5_perf_cache_map;
+        armv7pmu.event_map      = &armv7_a5_perf_map;
+        armv7pmu.num_events     = armv7_read_num_pmnc_events();
+        return &armv7pmu;
+}
 #else
 static const struct arm_pmu *__init armv7_a8_pmu_init(void)
 {
@@ -920,4 +1061,9 @@ static const struct arm_pmu *__init armv7_a9_pmu_init(void)
 {
         return NULL;
 }
+
+static const struct arm_pmu *__init armv7_a5_pmu_init(void)
+{
+        return NULL;
+}
 #endif  /* CONFIG_CPU_V7 */