MIPS: perf: Add XLP support for hardware perf.

Add support for XLP performance counters register in perf. Update
mips/Kconfig so that perf events can be selected for XLP.

Signed-off-by: Zi Shen Lim <zlim@netlogicmicro.com>
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Patchwork: http://patchwork.linux-mips.org/patch/4457
Signed-off-by: John Crispin <blogic@openwrt.org>

2 files changed, 125 insertions, 1 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index dba9390d37c..a4919b0932e 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2186,7 +2186,7 @@ config NODES_SHIFT
 
 config HW_PERF_EVENTS
         bool "Enable hardware performance counter support for perf events"
-        depends on PERF_EVENTS && !MIPS_MT_SMTC && OPROFILE=n && (CPU_MIPS32 || CPU_MIPS64 || CPU_R10000 || CPU_SB1 || CPU_CAVIUM_OCTEON)
+        depends on PERF_EVENTS && !MIPS_MT_SMTC && OPROFILE=n && (CPU_MIPS32 || CPU_MIPS64 || CPU_R10000 || CPU_SB1 || CPU_CAVIUM_OCTEON || CPU_XLP)
         default y
         help
           Enable hardware performance counter support for perf events. If
diff --git a/arch/mips/kernel/perf_event_mipsxx.c b/arch/mips/kernel/perf_event_mipsxx.c
index a9b995dcf69..b14c14d90fc 100644
--- a/arch/mips/kernel/perf_event_mipsxx.c
+++ b/arch/mips/kernel/perf_event_mipsxx.c
@@ -840,6 +840,16 @@ static const struct mips_perf_event bmips5000_event_map
         [PERF_COUNT_HW_BRANCH_MISSES] = { 0x02, CNTR_ODD, T },
 };
 
+static const struct mips_perf_event xlp_event_map[PERF_COUNT_HW_MAX] = {
+        [PERF_COUNT_HW_CPU_CYCLES] = { 0x01, CNTR_ALL },
+        [PERF_COUNT_HW_INSTRUCTIONS] = { 0x18, CNTR_ALL }, /* PAPI_TOT_INS */
+        [PERF_COUNT_HW_CACHE_REFERENCES] = { 0x04, CNTR_ALL }, /* PAPI_L1_ICA */
+        [PERF_COUNT_HW_CACHE_MISSES] = { 0x07, CNTR_ALL }, /* PAPI_L1_ICM */
+        [PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = { 0x1b, CNTR_ALL }, /* PAPI_BR_CN */
+        [PERF_COUNT_HW_BRANCH_MISSES] = { 0x1c, CNTR_ALL }, /* PAPI_BR_MSP */
+        [PERF_COUNT_HW_BUS_CYCLES] = { UNSUPPORTED_PERF_EVENT_ID },
+};
+
 /* 24K/34K/1004K cores can share the same cache event map. */
 static const struct mips_perf_event mipsxxcore_cache_map
                                 [PERF_COUNT_HW_CACHE_MAX]
@@ -1092,6 +1102,100 @@ static const struct mips_perf_event octeon_cache_map
 },
 };
 
+static const struct mips_perf_event xlp_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)]      = { 0x31, CNTR_ALL }, /* PAPI_L1_DCR */
+                [C(RESULT_MISS)]        = { 0x30, CNTR_ALL }, /* PAPI_L1_LDM */
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_ACCESS)]      = { 0x2f, CNTR_ALL }, /* PAPI_L1_DCW */
+                [C(RESULT_MISS)]        = { 0x2e, CNTR_ALL }, /* PAPI_L1_STM */
+        },
+        [C(OP_PREFETCH)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
+        },
+},
+[C(L1I)] = {
+        [C(OP_READ)] = {
+                [C(RESULT_ACCESS)]      = { 0x04, CNTR_ALL }, /* PAPI_L1_ICA */
+                [C(RESULT_MISS)]        = { 0x07, CNTR_ALL }, /* PAPI_L1_ICM */
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
+        },
+        [C(OP_PREFETCH)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
+        },
+},
+[C(LL)] = {
+        [C(OP_READ)] = {
+                [C(RESULT_ACCESS)]      = { 0x35, CNTR_ALL }, /* PAPI_L2_DCR */
+                [C(RESULT_MISS)]        = { 0x37, CNTR_ALL }, /* PAPI_L2_LDM */
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_ACCESS)]      = { 0x34, CNTR_ALL }, /* PAPI_L2_DCA */
+                [C(RESULT_MISS)]        = { 0x36, CNTR_ALL }, /* PAPI_L2_DCM */
+        },
+        [C(OP_PREFETCH)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
+        },
+},
+[C(DTLB)] = {
+        /*
+         * Only general DTLB misses are counted use the same event for
+         * read and write.
+         */
+        [C(OP_READ)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { 0x2d, CNTR_ALL }, /* PAPI_TLB_DM */
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { 0x2d, CNTR_ALL }, /* PAPI_TLB_DM */
+        },
+        [C(OP_PREFETCH)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
+        },
+},
+[C(ITLB)] = {
+        [C(OP_READ)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { 0x08, CNTR_ALL }, /* PAPI_TLB_IM */
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { 0x08, CNTR_ALL }, /* PAPI_TLB_IM */
+        },
+        [C(OP_PREFETCH)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
+        },
+},
+[C(BPU)] = {
+        [C(OP_READ)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { 0x25, CNTR_ALL },
+        },
+        [C(OP_WRITE)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
+        },
+        [C(OP_PREFETCH)] = {
+                [C(RESULT_ACCESS)]      = { UNSUPPORTED_PERF_EVENT_ID },
+                [C(RESULT_MISS)]        = { UNSUPPORTED_PERF_EVENT_ID },
+        },
+},
+};
+
 #ifdef CONFIG_MIPS_MT_SMP
 static void check_and_calc_range(struct perf_event *event,
                                  const struct mips_perf_event *pev)
@@ -1444,6 +1548,20 @@ static const struct mips_perf_event *octeon_pmu_map_raw_event(u64 config)
         return &raw_event;
 }
 
+static const struct mips_perf_event *xlp_pmu_map_raw_event(u64 config)
+{
+        unsigned int raw_id = config & 0xff;
+
+        /* Only 1-63 are defined */
+        if ((raw_id < 0x01) || (raw_id > 0x3f))
+                return ERR_PTR(-EOPNOTSUPP);
+
+        raw_event.cntr_mask = CNTR_ALL;
+        raw_event.event_id = raw_id;
+
+        return &raw_event;
+}
+
 static int __init
 init_hw_perf_events(void)
 {
@@ -1522,6 +1640,12 @@ init_hw_perf_events(void)
                 mipspmu.general_event_map = &bmips5000_event_map;
                 mipspmu.cache_event_map = &bmips5000_cache_map;
                 break;
+        case CPU_XLP:
+                mipspmu.name = "xlp";
+                mipspmu.general_event_map = &xlp_event_map;
+                mipspmu.cache_event_map = &xlp_cache_map;
+                mipspmu.map_raw_event = xlp_pmu_map_raw_event;
+                break;
         default:
                 pr_cont("Either hardware does not support performance "
                         "counters, or not yet implemented.\n");