ARC: perf: Add some comments/debug stuff

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/arch/arc/kernel/perf_event.c b/arch/arc/kernel/perf_event.c
index 64261c2711b1..181baeed4495 100644
--- a/arch/arc/kernel/perf_event.c
+++ b/arch/arc/kernel/perf_event.c
@@ -90,6 +90,10 @@ static int arc_pmu_cache_event(u64 config)
         if (ret == CACHE_OP_UNSUPPORTED)
                 return -ENOENT;
 
+        pr_debug("init cache event: type/op/result %d/%d/%d with h/w %d \'%s\'\n",
+                 cache_type, cache_op, cache_result, ret,
+                 arc_pmu_ev_hw_map[ret]);
+
         return ret;
 }
 
@@ -106,8 +110,9 @@ static int arc_pmu_event_init(struct perf_event *event)
                 if (arc_pmu->ev_hw_idx[event->attr.config] < 0)
                         return -ENOENT;
                 hwc->config = arc_pmu->ev_hw_idx[event->attr.config];
-                pr_debug("initializing event %d with cfg %d\n",
-                         (int) event->attr.config, (int) hwc->config);
+                pr_debug("init event %d with h/w %d \'%s\'\n",
+                         (int) event->attr.config, (int) hwc->config,
+                         arc_pmu_ev_hw_map[event->attr.config]);
                 return 0;
         case PERF_TYPE_HW_CACHE:
                 ret = arc_pmu_cache_event(event->attr.config);
@@ -260,19 +265,22 @@ static int arc_pmu_device_probe(struct platform_device *pdev)
                 arc_pmu->n_counters, arc_pmu->counter_size, cc_bcr.c);
 
         cc_name.str[8] = 0;
-        for (i = 0; i < PERF_COUNT_HW_MAX; i++)
+        for (i = 0; i < PERF_COUNT_ARC_HW_MAX; i++)
                 arc_pmu->ev_hw_idx[i] = -1;
 
+        /* loop thru all available h/w condition indexes */
         for (j = 0; j < cc_bcr.c; j++) {
                 write_aux_reg(ARC_REG_CC_INDEX, j);
                 cc_name.indiv.word0 = read_aux_reg(ARC_REG_CC_NAME0);
                 cc_name.indiv.word1 = read_aux_reg(ARC_REG_CC_NAME1);
+
+                /* See if it has been mapped to a perf event_id */
                 for (i = 0; i < ARRAY_SIZE(arc_pmu_ev_hw_map); i++) {
                         if (arc_pmu_ev_hw_map[i] &&
                             !strcmp(arc_pmu_ev_hw_map[i], cc_name.str) &&
                             strlen(arc_pmu_ev_hw_map[i])) {
-                                pr_debug("mapping %d to idx %d with name %s\n",
-                                         i, j, cc_name.str);
+                                pr_debug("mapping perf event %2d to h/w event \'%8s\' (idx %d)\n",
+                                         i, cc_name.str, j);
                                 arc_pmu->ev_hw_idx[i] = j;
                         }
                 }