MIPS: perf: Add hardware perf events support for Loongson-3

This patch enable hardware performance counter support for Loongson-3's
perf events.

Signed-off-by: Huacai Chen <chenhc@lemote.com>
Cc: Steven J. Hill <Steven.Hill@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Fuxin Zhang <zhangfx@lemote.com>
Cc: Zhangjin Wu <wuzhangjin@gmail.com>
Patchwork: https://patchwork.linux-mips.org/patch/9618/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 71 insertions, 0 deletions

diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
index 192e7f59245e..cc1b6fadf089 100644
--- a/arch/mips/kernel/perf_event_mipsxx.c
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -825,6 +825,13 @@ static const struct mips_perf_event mipsxxcore_event_map2
         [PERF_COUNT_HW_BRANCH_MISSES] = { 0x27, CNTR_ODD, T },
 };
 
+static const struct mips_perf_event loongson3_event_map[PERF_COUNT_HW_MAX] = {
+        [PERF_COUNT_HW_CPU_CYCLES] = { 0x00, CNTR_EVEN },
+        [PERF_COUNT_HW_INSTRUCTIONS] = { 0x00, CNTR_ODD },
+        [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x01, CNTR_EVEN },
+        [PERF_COUNT_HW_BRANCH_MISSES] = { 0x01, CNTR_ODD },
+};
+
 static const struct mips_perf_event octeon_event_map[PERF_COUNT_HW_MAX] = {
         [PERF_COUNT_HW_CPU_CYCLES] = { 0x01, CNTR_ALL },
         [PERF_COUNT_HW_INSTRUCTIONS] = { 0x03, CNTR_ALL },
@@ -1008,6 +1015,61 @@ static const struct mips_perf_event mipsxxcore_cache_map2
 },
 };
 
+static const struct mips_perf_event loongson3_cache_map
+                                [PERF_COUNT_HW_CACHE_MAX]
+                                [PERF_COUNT_HW_CACHE_OP_MAX]
+                                [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
+[C(L1D)] = {
+        /*
+         * Like some other architectures (e.g. ARM), the performance
+         * counters don't differentiate between read and write
+         * accesses/misses, so this isn't strictly correct, but it's the
+         * best we can do. Writes and reads get combined.
+         */
+        [C(OP_READ)] = {
+                [C(RESULT_MISS)]        = { 0x04, CNTR_ODD },
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_MISS)]        = { 0x04, CNTR_ODD },
+        },
+},
+[C(L1I)] = {
+        [C(OP_READ)] = {
+                [C(RESULT_MISS)]        = { 0x04, CNTR_EVEN },
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_MISS)]        = { 0x04, CNTR_EVEN },
+        },
+},
+[C(DTLB)] = {
+        [C(OP_READ)] = {
+                [C(RESULT_MISS)]        = { 0x09, CNTR_ODD },
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_MISS)]        = { 0x09, CNTR_ODD },
+        },
+},
+[C(ITLB)] = {
+        [C(OP_READ)] = {
+                [C(RESULT_MISS)]        = { 0x0c, CNTR_ODD },
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_MISS)]        = { 0x0c, CNTR_ODD },
+        },
+},
+[C(BPU)] = {
+        /* Using the same code for *HW_BRANCH* */
+        [C(OP_READ)] = {
+                [C(RESULT_ACCESS)]      = { 0x02, CNTR_EVEN },
+                [C(RESULT_MISS)]        = { 0x02, CNTR_ODD },
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_ACCESS)]      = { 0x02, CNTR_EVEN },
+                [C(RESULT_MISS)]        = { 0x02, CNTR_ODD },
+        },
+},
+};
+
 /* BMIPS5000 */
 static const struct mips_perf_event bmips5000_cache_map
                                 [PERF_COUNT_HW_CACHE_MAX]
@@ -1542,6 +1604,10 @@ static const struct mips_perf_event *mipsxx_pmu_map_raw_event(u64 config)
                 else
                         raw_event.cntr_mask =
                                 raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
+                break;
+        case CPU_LOONGSON3:
+                raw_event.cntr_mask = raw_id > 127 ? CNTR_ODD : CNTR_EVEN;
+        break;
         }
 
         raw_event.event_id = base_id;
@@ -1671,6 +1737,11 @@ init_hw_perf_events(void)
                 mipspmu.general_event_map = &mipsxxcore_event_map;
                 mipspmu.cache_event_map = &mipsxxcore_cache_map;
                 break;
+        case CPU_LOONGSON3:
+                mipspmu.name = "mips/loongson3";
+                mipspmu.general_event_map = &loongson3_event_map;
+                mipspmu.cache_event_map = &loongson3_cache_map;
+                break;
         case CPU_CAVIUM_OCTEON:
         case CPU_CAVIUM_OCTEON_PLUS:
         case CPU_CAVIUM_OCTEON2: